ML14007A088

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Response to NRC Request for Additional Information, Dated November 21, 2013, Related to the Byron and Braidwood Stations, Units 1 and 2 License Renewal Application, Byron Station Applicant'S Environmental Report. Part 13 of 15
ML14007A088
Person / Time
Site: Byron, Braidwood  Constellation icon.png
Issue date: 12/19/2013
From:
Exelon Generation Co, Exelon Nuclear
To:
Office of Nuclear Reactor Regulation
Shared Package
ML14007A078 List:
References
RS-13-282
Download: ML14007A088 (783)
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Text

Byron Environmental Audit -Request for Additional Information Response Question #: HH-2 Category:

Human Health Statement of Question: The ER (Page 4-30) states, 'The highest daily blowdown temperature reported in recent years was 360C (97 0 F), in August 2009 (Byron Station Monthly Discharge Monitoring Report for August 2009)." Does this statement remain true since the submission of the license renewal application?

Response: After the ER was prepared, drought conditions were experienced in Illinois during 2012, which caused higher than normal ambient river temperatures and correspondingly higher blowdown temperatures.

The highest daily blowdown temperature reported in July 2012 was 39.4 0C (103 OF), which is well below the optimal temperature range for growth and reproduction of thermophilic organisms.

List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: HH-3 Category:

Human Health -Microbiological Organisms Statement of Question: Provide a description of the procedures or protocol that Exelon maintains to ensure that workers performing maintenance and cleaning of cooling towers are not exposed to Legionella spp. or other potentially harmful thermophilic microorganisms.

Response: Exelon Generation maintains no standing procedures that specifically address Legionella spp.hazards during cooling tower maintenance activities at Byron Station. However, as part of its commitment to occupational safety and health, Exelon Generation has implemented a Job Hazard Analysis procedure, which provides a standard methodology for identifying industrial hazards prior to performance of jobs (SA-AA-1 16-2124).

The Job Hazard Analysis procedure, which is used to break down the steps of the job, identify the potential hazards, and establish recommended actions to protect workers, is used particularly for infrequently performed jobs where hazards may not be evident or anticipated.

This procedure prompts work planners and supervisors to (1) list potential hazards for each step of the job by identifying the hazardous conditions that could potentially lead to an accident and (2) review all work in the area and adjacent areas to determine how each job or evolution affects workers in the area. All possible factors that may influence safe execution of the job, including chemical and biological hazards, would be considered and appropriate worker protection measures would be employed during performance of the work.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: HH-4 Category:

Human Health -Microbiological Organisms Statement of Question: The ER (Page 4-30) states that Exelon chlorinates Rock River water used in the circulating and service water systems to control the survival and growth of thermophilic microorganisms.

Briefly describe the chlorination process (i.e., concentration, periodicity, etc.)Response: Rock River water used in three plant systems is chlorinated as follows: " Circulating water is chlorinated for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> per day per unit by injecting sodium hypochlorite and sodium bromide upstream of the circulating water pumps for a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> per day for each unit during operation.

The target concentration during chlorination is between 0.2 and 0.5 parts per million (ppm).* Non-essential service water is continuously chlorinated by injecting sodium hypochlorite to achieve a target concentration of 0.05 -0.2 ppm.* Essential service water is continuously chlorinated by injecting sodium hypochlorite to achieve a target concentration of 0.05 -0.2 ppm.Residual biocide concentration is eliminated by feeding sodium bisulfate prior to returning water to the Rock River.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: HH-5 Category:

Human Health -Microbiological Organisms Statement of Question: Does Exelon monitor for any thermophilic microorganisms in Byron's cooling system, cooling towers, or in the Rock River near the Byron thermal discharge?

If so, describe the monitoring methods, periodicity, and results.Response: Exelon monitors bacteria in systems containing Rock River water as follows:* Circulating water is monitored for total aerobic bacteria and sessile bacteria;" The natural draft cooling tower fill outlet is monitored for total aerobic bacteria;* Non-essential service water is monitored for total aerobic bacteria;* Essential service water is monitored for total aerobic bacteria.Results are typically less than detectable and maintained below the procedurally established goal threshold of < 10,000 colony forming units per milliliter (cfu/ml).

No targeted monitoring for thermophilic microorganisms is performed.

List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: Met-1 Category:

Meteorology, Air Quality and Noise Statement of Question: Provide a copy of Byron's Federally Enforceable State Operating Permit for stationary emission sources (standby emergency diesel generators, auxiliary boilers, auxiliary feedwater pumps, essential service water makeup water pumps, a fire pump, and cooling towers).Response: The requested information is attached.List Attachments Provided: 1. Federally Enforceable State Operating Permit, ID No. 141820AAA, Expiration Date: December 13, 2007 2. Application for Renewal of Federally Enforceable State Operating Permit, ID No.141820AAA, September 11, 2007 3. Letter from Exelon Nuclear (M. Snow) to IEPA (B. Beasly) regarding FESOP Renewal Application Byron Nuclear Power Station, Application No. 78090018, December 10, 2007 [updating information in the 9/11/2007 application and waiving the statutory 180-day final decision deadline]4. Letter from Exelon Nuclear (B. Adams) to IEPA (B. Beasly) regarding FESOP Renewal Application Byron Nuclear Power Station, Application No. 78090018, June 11, 2008[waiving the statutory 180-day final decision deadline]

ILLINOIS ENVIRONMENTAL PROTECTION AGENCY S P.O. Box 19506, SPRINGFIELD, ILLINOIS 62794-9506.

RENEE CIPRIANO, DIRECTOR 21.7/78 2 -2 113 FEDERALLY ENFORCEABLE STATE OPERATING PERMIT PERMITTEE.

Exelon. Generation Company, LLC Attn: Mr. Terry Steinert 4300 Winfield Road.Warrenville Illinois:

60555. .Application No.: 78090018 I.D. No.: 141820AAA Applicant's Designation:

BYRONFESOP Date Received:

December 10, 2001

Subject:

Byron Generating Station ID ... 3,2t20, .0. Expiration Date:' December 13, 2007..Location:

Byron Nuclear Power Station,.

4450 North German Church Road, Byron...Ogle County.'This Permit is hereby granted to the above-designated Permittee to.OPERATE emission source(s) and/or air pollution control. equipment.

consisting:.

of: six..ý: (6) large diesel engine generators (greater than 600. horsepower,.

each), various smaller diesel. engines (used for electric generation..

or pumping water)*, two":(2) auxiliary boilers (93.0 mmBtu/hr, each), one. (1) gasoline storage and:.dispensing.facility with vapor balance systems, one: (1) Rad Waste.V volume Reduction System (RWVRS), and various, cooling towers: as described

..in."....the above-referenced application.

This Permit is subject..to standard conditions attached hereto and:the following special.condition(s):

  • This. permit does not address emergency engine maintained at the source..by..the ..Illinois Department of Nuclear:.

Safety.la... This Federally Enforceable State Operating Permit (FESOP) is issued.. to limit the emissions of: air pollutants*

from all the emission units..:.:%.

combined, as listed in the above paragraph to less than major source thresholds, for example, less than*100 tons per year of nitrogen oxide (NOr) , as further described in Attachment A. As a result, the source is excluded from requirements to obtain a Clean. Air Act Permit Program (CAAPP) permit..b. Prior to:issuance, .a draft .of.this permit has undergone a.. public notice..and."comment period..2a. Total usage of distillate fuel oil for large engines (generators and:......o:.ther engines.with a capacity.greater than 600 horsepower each).shall not .exceed 72,800 gallons per month. and 364,000 gallons per year,:.:based on AP-42 emission factors."-

.b. Total usage of distillate*

fuel.."oil for the :.small.engines with a.., capacity of 600 horsepower each or smaller shall not exceed 8,000::..gallons per month:and 40,000"gallons per year,. based on AP-42 emission......

..factors. ......GEMR(GE H. RyAkN, GO)VERNOR PRINVE6 ()N- RECY(Ac I D P'APER Page 2 c. Total usage of distillate fuel oil for the boilers shall not exceed 34,000 gallons per month and 100,000 gallons per year, based on AP-42 emission factors.d. Operation of the Rad Waste Volume Reduction System (RWVRS) shall not exceed 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> per month and 1,512 hours0.00593 days <br />0.142 hours <br />8.465608e-4 weeks <br />1.94816e-4 months <br /> per year, based on information provided in the permit application.

e. Annual throughput of gasoline through the gasoline storage tanks shall not exceed 50,000 gallons/year.
f. Compliance with annual limits shall be determined from a running total of twelve months of data.3. Each gasoline storage tank shall be equipped and operated with a submerged loading pipe, pursuant to 35 IAC 215.583(a)

(1).4a. The cooling towers (two -natural draft counter flow and eight -induced draft counter flow cells) shall each be equipped, operated and maintained with drift eliminators or other comparable features designed to limit the loss of water droplets from the cooling towers to not more than 0.0005% for natural draft and 0.001% for induced draft counter flow cooling towers, respectively of the circulating water flow (0.000005 and 0.00001 drift).b. The particulate matter (PM, 0) emissions from two natural draft counter flow and eight induced draft counter flow cells cooling towers shall not exceed 36.6 tons/year and 2.3 tons/year, respectively.

These limits are based on information in the application indicating a nominal emission rate of 8.36 lbs/hour and 0.52 lb/hour for natural draft and induced draft counter flow cooling towers operating at a design flow rate of 1,400,000 gallons/minute and 44,000 gallons/minute, respectively.

5. Emissions of volatile organic material (VOM) from storage and handling of gasoline shall not exceed 2.0 ton per year. This limit is based on standard USEPA emission factors for breathing and working losses and information provided in the permit application.
6. The emissions of Hazardous Air Pollutants (HAPs) as listed in Section 112(b) of the Clean Air Act shall not equal or exceed 10 tons per year of any single HAP or 25 tons per year of any combination of such HAPs, or such lesser quantity as USEPA may establish in rule which would require the Permittee to obtain a CAAPP permit from the Illinois EPA.As a result of this condition, this permit is issued based on the emissions of any HAP from this source not triggering the requirement to obtain a CAAPP permit from the Illinois EPA.7. At all times, the Permittee shall to the extent practicable, maintain and operate the above referenced emission sources, inma manner consistent with good air pollution control practice for minimizing emissions.

Page 3 8a. Organic liquid by-products or waste materials shall not be used in these fuel combustion emission sources without written approval from the Illinois EPA.b. At the above location, the Permittee shall not keep, store, or utilize: i. Distillate fuel oil (Grades No. 1 and 2) with a sulfur content greater than the larger of the following two values: A. 0.28 weight percent, or B. The wt. percent given by the formula: Maximum wt. percent sulfur = (0.000015) x (Gross heating value of oil, Btu/lb)C. The Illinois EPA shall be allowed to sample all fuels stored at the above location.9. The Permittee shall maintain records of the following items: a. Fuel usage for the large engines (generators and other engines with a capacity greater than 600 horsepower), for the other engines and for the boilers, (gallons/month and gallons/year, for each of these groups of units).b. Documentation for sulfur content of fuel oil, e.g., analysis results of representative fuel samples or copies of fuel supplier certifications.

c. The Permittee shall maintain the following records for each gasoline storage dispensing facility, including associated gasoline storage tanks: i. A logbook or other record that identifies each shipment of gasoline added to each tank, with date and amount;ii. A logbook or other record of each inspection of the tanks and dispensing facilities to verify proper operation, with date and responsible individual; iii. The combined gasoline throughput of the storage tanks, (gallons/month and gallons/year).
d. The Permittee shall keep the following records for cooling towers with supporting data.i. The following reference information for the cooling towers, which shall be updated in the event of significant changes to the operation of the tower: A. Cooling water flow rate (gallons/hour) based on representative operation of the cooling towers; and Page 4 B. Cooling water total dissolved solids (TDS) content, based on representative sampling of water discharge.

ii. The following operating records for each tower: A. Operation of cooling towers (e.g., log for number of towers operating each hour).B. Total operation of cooling towers (e.g., hours/month);

and C. Emissions of particulate matter (tons/year), with supporting calculations.

10. All records and logs required by this permit shall be retained at a readily accessible location at the source for at least three years from the date of entry and shall be made available for inspection and copying by the Illinois EPA or USEPA upon request. Any records retained in an electronic format (e.g., computer) shall be capable of being retrieved and printed on paper during normal source office hours so as to be able to respond to an Illinois EPA request for records during the course of a source inspection.

1la. The Permittee shall submit an Annual Emissions Statement to the Agency by May Ist of each year. This report shall include the fuel oil consumption by the large diesel engines (generators and pumps greater than 600 horsepower), the other engines, and the boilers. If there has been no exceedance during the prior year, the Annual Emissions Statement shall include a statement to that effect.b. If there is an exceedance of the requirements of this permit, as determined by the records required by this permit or by other means, the Permittee shall submit a report to the Illinois EPA's Compliance Section in Springfield, Illinois within 30 days after the exceedance.

The report shall include the emissions released in accordance with the recordkeeping requirements, a copy of the relevant records, a description of the exceedance and efforts to reduce emissions and future occurrences.

12. Two (2) copies of required reports and notifications concerning equipment operation or repairs, performance testing or a continuous monitoring system shall be sent to: Illinois Environmental Protection Agency Division of Air Pollution Control Compliance Section (#40)P.O. Box 19276 Springfield, Illinois 62794-9276 Telephone:

217/782-5811 Facsimile:

217/782-6348 Page 5 and one (1) copy shall be sent to the Illinois EPA's regional office at the following address unless otherwise indicated:

Illinois Environmental Protection Agency Division of Air Pollution Control 5415 North University Peoria, Illinois 61614 Telephone:

309/693-5461 Facsimile:

309/693--5467 If you have any questions concerning this permit, please call Youra Benofamil at 217/782-2113.

Donald E. Sutton, P. E.Manager, Permit Section Division of Air Pollution Control DES:YB:jar cc: Illinois EPA, FOS Region 2 Illinois EPA, Compliance Section Lotus Notes, USEPA I.D. No.: 141820AAA Application No.: 78090018 Facility:

Byron Nuclear Power Station Attachment A This attachment provides a summary of the maximum emissions from the source operating in compliance with the requirements of this federally enforceable permit. In preparing this summary, the Illinois EPA used the annual operating scenario that results in maximum emissions from this source. This, is handling 504,000 gallons of distillate fuel oil. The resulting maximum emissions are well below the levels, e.g., 100 tons per year of NO,, at which this source would be considered a major source for purposes of the Clean Air Act Permit Program. Actual emissions from this source will be less than predicted in this summary to the extent that less material is handled, and control measures are more effective than required in this permit.1. Large Diesel Engines (Generators and other engines with a capacity greater than 600 horsepower each): Limit on Total Fuel Usage: 364,000 Gallons/Year Emission Rate Emissions Pollutant (Lb/mmBtu) (Tons/Yr)NO, 3.2 81.52 CO 0.85 21.68 S02 1.01

  • 0.28 = 0.2828 7.20 VOM 0.09 2.28 PM 0.0697 1.78 These emissions reflect, AP-42 emission factors for internal combustion units, and a conversion factor of 140,000 Btu per gallon of distillate oil.2. Small Diesel Engines with a capacity of 600 horsepower each or smaller: Limit on Total Fuel Usage: 40,000 Gallons/Year Emission Rate Emissions Pollutant (Lb/mmBtu) (Tons/Yr)NO, 4.41 12.36 CO 0.95 2.68 S0 2 0.29 0.80 VOM 0.36 1.00 PM 0.31 0.88 These emissions reflect AP-42 emission factors for internal combustion units and a conversion factor of 140,000 Btu per gallon of distillate oil.

Page 2 3. Two Boilers: Limit on Total Fuel Usage: 100,000 Gallons/Year Pollutant Emission Rate (Lb/1,000 Gal)Emissions (Tons/Yr)NO, CO SO 2 VOM PM 20.0 5.0 142

  • 0.28 = 39.76 0.2 2.0 1.00 0.26 1.98 0 01 0.10-These emissions reflect, AP-42 emission factors for distillate fuel oil fired boilers.4. Rad Waste Volume Reduction System (RWVRS): Limit on hours of Operation:

1,512 Hours/Year Pollutant NO, CO S02 VOM Emission Rate (Lb/Hr)0.131 0.980 0.200 0.310 Emissions (Tons/Yr)0.10 0.75 0.16 0.25 These emissions reflect, emission factors supplied by the Permittee which are based on tests.5. Emissions from all gasoline storage and handling, in total: Limit on Gasoline Throughput:

2.0 ton VOM per year 50,000 gallons year This reflects standard USEPA emission factors from Compilation of Air Pollutant Emission Factors, AP-42 for breathing and working losses.6. Cooling Towers: Emissions (Tons/Year)

Pollutant Two Natural Draft Counter Flow Eight Induced Draft Counter Flow Cells PM/ PM" 0 PM/PM 1 0 36.6 2.30 Page 3 7. Propane-Fired Engine Generators:

Limit on Total Fuel Usage: 3,000 Gallons/Year Emission Rate Pollutant (Lb/1000 Gallons)Emissions (Tons/Year) 0.02 NO.14 YB :psj STATE OF ILLINOIS ENVIRONMENTAL PROTECTION AGENCY DIVISION OF AIR POLLUTION CONTROL P.O. BOX.19506.

SPRINGFIELD, ILLINOIS 62794-950'6 STANDARD' CONDITIONS.

.FOR OPERATING PERMITS May, 1993 The Illinois Environmental Protection Act (Illinois Revised Statutes, Chapter 111-1/2, Section 1039) grants the Environmental Protection:Agency authority to impose conditions on permits which it issues.The following, conditions are applicable unless superseded by special.permit.

conditions(s).:..

1. The issuance of this permit. does not release the Permittee.

from compliance.

with state and federal regulations which are. part: of the Illinois State Implementation Plan, as well as with other applicable statues and regulations of the United States or the State.of Illinois or with applicable local laws,. ordinances and regulations.

2. The% Illinois EPA. has issued this."permit, based upon the:.information:submittedby the: Permittee in the permit application. "Any misinformationr false, statement or misrepresentation.

in the application, shall be ground for revocation under 35 Ill. Adm. Code 201.1666.3. a. The Permittee shall not authorize, cause., direct or allow any modification, as defined in 35 Ill. Adm. Code: 201:*.*102, of equipment, operations or practices which are reflected in'the permit application as submitted unless, a...new application' or request for revision:

of the existing permit is filed with the *Illinois EPA and.. un.less..a.

new permit. or revision of the existing permit(s) is issued for such modification..

b."" This.-permit only overs emission sourcesand control equipment while physically present at the: indicated.

plant:.:.

location(s):%.:

Unless the..permit specifically.

provides for :equipment relocation, this permit is void for an item of equipment on the day it' is removed from the permitted location(s).

or if ali equipment is .removed, notwithstanding the expiration date specified on the permit .4. .."The Permittee' shall allow any'duly.

authorized agent:of, the Illinois.

EPA, upon.the:presentation of credentials, at reasonable times: a. To enter the Permittee's property where actual..or potential effluent,:

emission or noise sources are located or where any activity.is to be conducted.pursuant to this permit;.b. To: have access ,to and to. copy.::. any. records. required 'to be. kept under the,.. terms and conditions of.this permit;c. To inspect, including during any hours of operation of equipment constructed

or operated under this.permit, such equipment and any equipment.

required to be kept, used, operated, calibrated and maintained under. this permit;d.. To obtain and. remove samples.of any discharge orem.ission of pollutants; and e. To enter and utilize any photographic, recording, testing,, monitoring.

or. other equipment for the purpose-of preserving, testing, -monitoring or.recording any activity, discharge.

or%:emission authorized by this permit.5. The issuance of this permit: a. Shall not: be. considered as in any manner affecting the title'Of the premisesf uponwhich the permitted.facilities are located;..IL 532-0224 090-005 APC 161 Rev. March, 2001 PRINTED ON RECYCLED PAPER.

b. Does not release the Permittee from any liability for damage to person or property caused by or resulting from the construction, maintenance, or operation of the facilities;
c. Does not take intc consideration or attest to the structural stability of any unit or part of the project; and d. In no manner implies or suggests that the Illinois EPA (or its officers, agents, or employees) assumes any liability, directly or indirectly, for any loss due to damage, installation, maintenance, or cpera-. ion of the proposed equipment or facility.6. The facilities covered by this permit shall be operated in such a manner that the disposal of air contaminants collected by the equipment shall not cause a violation of the Environmental Protection Act or regulations promulgated thereunder.
7. The Permittee shall maintain all equipment covered under this permit in such a manner that the performance of such equipment shall not cause a violation of the Environmental Protection Act or regulations promulgated thereuner.
8. The Permittee shall maintain a maintenance record on the premises for each item of air pollution control equipment.

This records shall be made available to any agent of the Environmental Protection Agency at any time during normal working hours and/or operating hours.As a minimum, this record shall show the dates of performance and nature of preventative maintenance activities.

9. No person shall cause or allow continued operation during malfunction, breakdown or startup of any emission source or related air pollution control equipment if such operation would cause a violation of an applicable emission standard or permit limitation.

Should a malfunction, breakdown or startup occur which results in emissions in excess of any applicable standard or permit limitation, the Permittee shall: a. Immediately report the incident to the Illinois EPA's Regional Field Operations Section Office by telephone, telegraph, or other method as constitutes the fastest available alternative, and shall comply with all reasonable directives of the Illinois EPA with respect to the incident;b. Maintain the following records for a period of no less than two (2) years: i. Date and duration of malfunction, breakdown, or startup, ii. Full and detailed explanation of the cause, iii. Contaminants emitted and an estimate of quantity of emissions, iv. Measures.

taken to minimize the amount of emissions during the malfunction, breakdown or startup, and v. Measures *:aken to reduce future occurrences and frequency of incidents.

10. If the permlt applicaticn contains a compliance program and project completion schedule, the Permittee shall submit a project completion status report within thirty (30) days of any date specified in the czrn.pliance program and project completion schedule or at six month intervals, wh:ichever is more frequent.1.. The Permittee shall submit an Annual Emission Report as required by 35 Ill. Adm. Code 201.302 and 3[ 1-11. Adm. Cods Part 2-.4.2815C Directory Environmental Protection Agency Bureau of Air September
1. 1992 For assistance in preparing a permit application, I 1".contact the Permit Section: I L Oct&1 L O Illinois Environmental Protection Agency I ..;.n -A%;Division ot Air Pollution Control S'.Permit Secliorn 1 -2200 Churchill Road. J Springfield.

Illinois 62706 -; Z; ýr 4xu1 ` i`L 217/7822113 f ... .." ~~~~~~ t-- r;/ rLV,;Or contact a regional office of the Field Opera- ".- , tions Section. The regional offices and their

  • r INb&A j- I~.5cow areas of responsibility are shown on the map. 'I i I ,,o,,,, ,he addresses and telephone numbers of the i 2 _ i regional offices are as follows: -.-,j I~~~ I Gat,,,,, ILLINOIS EPA 'A
  • i- h1 i I 'REGION 1 I r " -U .-. ..BUREAU OF AIR, FOS aS 9511 WEST HARRISON .I DES PLAINES, IL 60016 CA" F -i 847-294-4000 PIS #AD*-, ..-- -ii *I--J ° ,-,-,'-,,lnois EPA \ --- ..'_. ."'" CS ;. .. 4 " 5415 Norlh University

-l v; _1. --,--.i.......

Peoria. illinois 616'14 __ r-'j.,,

I rl.--, ----L J Illinois EPA I ___ Region3 2 1!-C-2009 MaIlDStreet

  • ai I -"R-"=CoP insville, Illinoi s 622314 "*\*.6. &Spin .-6183465120 2009.Mai Stre Co~linsville.

lini 623 7. X. I=et IP Phnnd on R6<YrW Papw.

Section 215.583 Gasoline Dispensing Facilities

-Storage Tank Filling Operations a) Subject to subsection (b) below, no person shall cause or allow the transfer of gasoline from any delivery vessel into any stationary storage tank at a gasoline dispensing facility unless: 1) The tank is equipped with a submerged loading pipe; and 2) The vapors displaced from the storage tank during filling are processed by a vapor control system that includes one or more of the following:

A) A vapor collection system that meets the requirements of subsection (d)(4) below; or B) A refrigeration-condensation system or any other system approved by the Agency that recovers at least 90 percent by weight of all vaporized organic material from the equipment being controlled; and C) The delivery vessel displays the appropriate sticker pursuant to the requirements of Section 215.584(b) or (d) of this Part.b) The requirements of subsection (a)(2) above shall not apply to transfers of gasoline to a stationary storage tank at a gasoline dispensing facility if: 1) The tank is equipped with a floating roof or other system of equal or better emission control as approved by the Agency;2) The tank has a capacity of less than 2000 gallons and is in place and operating before January 1, 1979;3) The tank has a capacity of less than 575 gallons; or 4) The tank is not located in any of the following counties:

Boone, Cook, DuPage, Kane, Lake, Madison, McHenry, Peoria, Rock Island, St. Clair, Tazewell, Will or Winnebago.

c) Subject to subsection (b) above, each owner of a gasoline dispensing facility shall: 1) Install all control systems and make all process modifications required by subsection (a) above;

2) Provide instructions to the operator of the gasoline dispensing facility describing necessary maintenance operations and procedures for prompt notification of the owner in the case of any malfunction of a vapor control system; and 3) Repair, replace or modify any worn out or malfunctioning component or element of design.d) Subject to subsection (b) above, each operator of a gasoline dispensing facility and each delivery vessel operator shall: I) Maintain and operate each vapor control system in accordance with the owner's instructions;
2) Promptly notify the owner of any scheduled maintenance or malfunction requiring replacement or repair of a major component of a vapor control system;3) Maintain gauges, meters or other specified testing devices in proper working order;4) Operate the vapor collection system and delivery vessel unloading points in a manner that prevents: A) A reading equal to or greater than 100 percent of the lower explosive limit (LEL measured as propane) when tested in accordance with the procedure described in EPA 450/2-78-051 Appendix B, and B) Avoidable leaks of liquid during the filling of storage tanks; and 5) Within 15 business days after discovery of the leak by the owner, operator, or the Agency, repair and retest a vapor collection system which exceeds the limits of subsection (d)(4)(A) above.e) Gasoline dispensing facilities were required to take certain actions to achieve compliance which are summarized in Appendix C of this Part.

Exel 'n 5 M;Exelon Generation www.exeloncorp.coM Nuclear Byron Generating Station 4450 North German Church Road Byron, IL 61010-9794 Tel 815-234-5441 September 11, 2007 LTR: BYRON 2007-0102 File: 2.QR.0il.State of Illinois Environmental Protection Agency Division of Air Pollution Control 1021 N. Grand Avenue East P.O. Box 19506 Springfield, IL 62794-9506 Attn: Mr. Ed Bakowski

Subject:

Renewal of Federally Enforceable State Operating Permit Byron Nuclear Generating Station Permit I.D. No. 141820AAA

Dear Mr. Bakowski,

Exelon Generation Company, LLC (uExelon")

is requesting that the Illinois Environmental Protection Agency ("Agency")

renew the Federally Enforceable State Operating Permit (FESOP)for the Byron Nuclear Generating Station (Byron Station).

To support this request, application form APC 205A is enclosed (Attachment

1) along with evidence of signatory authority (Attachment
2) and supporting emission inventory information (Attachments 3, 4 and 5). In addition, Exelon requests the Agency consider the following comment concerning the existing FESOP.1. Attachment A of the current permit lists the following under paragraph 7: Propane-Fired Engine Generators:

Limit on Total Fuel Usage: 3,000 gallons/year Emissions Rate Emissions Pollutant (Lb/I000 gallons (Tons/year)

NO, 14 0.02 Exelon suggests this paragraph is removed from Attachment A

September 11, 2007 Mr. Ed Bakowski Page 2 Discussion:

The propane-fired generator onsite at Byron Station is not controlled or operated by Byron Station. The propane-fired generator and -the associated propane tank are operated and maintained by ComEd and are exempt per 35 IAC 201.146(i).

Also, the current Annual Emissions Report forms for Byron Station do not reference the propane-fired generator or the associated propane tank (exempt per 35 IAC 201.146(uu).

Additionally the current permit does not discuss the propane-fired generator or the associated propane tank except in Attachment A.Thank you for your consideration of this permit renewal and the opportunity to propose changes in the permit. If you have any questions or comments, please call Zoe Cox at (815) 406-3035.Respectfully, arsenSn Byron Nuclear Generating Station Plant Manager MSIZCIsdk Enclosure bcc: Z. Cox -Chemistry

-Byron K. Hersey -Environmental

-Cantera Attachment 1 APPLICATION FOR RENEWAL OF A FESOP STATE OF ILLINOIS ENVIRONMENTAL PROTECTION AGENCY DIVISION OF AIR POLLUTION CONTROL 1021 NORTH GRAND AVENUE EAST P. 0. BOX 19506 SPRINGFIELD, ILLINOIS 62794-9506 This Agency Is authorized to require and you must disclose this information under 415 ILCS 5/39. Failure to do so could result in the application being denied and penalties under 415 ILCS 5 at seq. It is not necessary to use this form in providing this information.

This form has been approved by the forms management center.FOR AGENCY USE ONLY APPLICATION FOR RENEWAL OF A FEDERALLY ENFORCEABLE I.D. NO, STATE OPERATING PERMIT (FESOP)IPERMIT NO.OPERATION OF: Byron Generating Station (A) DATE la. NAME OF OWNER: 2a. NAME OF OPERATOR: Exelon Generation Co., L.L.C. Byron Generatin Station lb. STREET ADDRESS OF OWNER: 2b. STREET ADDRESS OF OPERATOR: 4300 Winfield Road 4450 N. German Church Road 1c. CITY OF OWNER: 2c. CITY OF OPERATOR: Warrenville Byron Id. STATE OF O :le. ZIP CODE: 2d,_STATE OF OPERATOR:

I 2e. ZIP CODE: dIL655IL 61010 3a. NAME OF CORPORATE DIVISION OR PLANT: 3b. STREET ADDRESS OF EMISSION SOURCE: Byron Generating Station 4450 N.German Church Road 3c. CITY OF EMISSION SOURCE: 3d. LOCA-TED WITHIN CITY 39. TOWNSHIP:

3f. COUNTY: 3.ZIP CODE: Byron LIMITS: 0 YES H NO Rockvale Ogle 61010 4. ALL CORRESPONDENCE TO: (TITLE AND/OR NAME OF 5. WHO IS THE PERMIT APPLICANT?

INDIVIDUAL)

Ms. Zoe Cox [] OWNER 0 OPERATOR 6. ADDRESS FOR CORRESPONDENCE: (CHECK ONLY ONE) C OWNER 0 OPERATOR [] EMISSION SOURCE U U 7. THE UNDERSIGNED HEREBY MAKES APPLICATION FOR A PERMIT AND CERTIFIES THAT THE STATEMENTS CONTAINED HEREIN ARE TRUE AND CORRECT. AND FURTHER CERTIFIES THAT ALL PREVIOUSLY SUBMITTED INFORMATION REFERENCED IN THIS APPLICATION REMAINS TRUE. CORRECT AND CURRENT. BY AFFIXING HIS SIGNATURE HERETO HE FURTHER CERTIFIES THAT HE IS AUTHORIZED TO EXECUTE THIS APPLICATION.

AUTHORIZED SIGNATURE(S):

a BYSM &A-'UE , arseyne Snow SIGNAURE, Marseyne Snow BY" IkTE" SIGNATURE DATE TYPED OR PRINTED NAME OF SIGNER Plant Manager-Byron Station TYPED OR PRINTED NAME OF SIGNER TITLE OF SIGNER TITLE OF SIGNER (A) THIS FORM IS TO PROVIDE THE ILLINOIS EPA WITH GENERAL INFORMATION ABOUT THE EQUIPMENT TO BE OPERATED.(B) THIS APPLICATION MUST BE SIGNED IN ACCORDANCE WITH 35 ILL. ADM. CODE 201.154 OR 201.159 WHICH STATES: 'ALL APPLICATIONS AND SUPPLEMENTS THERETO SHALL BE SIGNED BY THE OWNER AND OPERATOR OF THE EMISSION SOURCE OR AIR POLLUTION CONTROL EQUIPMENT, OR THEIR AUTHORIZED AGENT, AND SHALL BE ACCOMPANIED BY EVIDENCE OF AUTHORITY TO SIGN THE APPLICATION.-

IF THE OWNER OR OPERATOR IS A CORPORATION, SUCH CORPORATION MUST HAVE ON FILE WITH THE ILLINOIS EPA A CERTIFIED COPY OF A RESOLUTION OF THE CORPORATION'S BOARD OF DIRECTORS AUTHORIZING THE PERSONS SIGNING THIS APPLICATION TO CAUSE OR ALLOW THE CONSTRUCTION OR OPERATION OF THE EQUIPMENT TO BE COVERED BY THE PERMIT.IL 532-2597 APC 205A (REV 2/00)Printed on Recycled Paper PAGE 1 OF 2 SITE FEE BILLING INFORMATION

10. CONTACT PERSON FOR APPLICATION:

Zoe Cox 9a. COMPANY NAME: 11. CONTACT PERSON'S TELEPHONE NUMBER: Byron Generating Station (815) 406-3035 9b. STREET ADDRESS: 12. CONTACT PERSON'S FACSIMILE NUMBER: 4450 N. German Church Road (815) 406-3301 9c. CITY: 13. FEDERAL EMPLOYER IDENTIFICATION NUMBER (FEIN): Byron 23-3064219 9d. STATE: 9f. BILLING CONTACT PERSON: 14. PRIMARY STANDARD INDUSTRIAL CLASSIFICATION (SIC) CATEGORY: IL Zoe Cox Electjic Power Generation 9e. ZIP CODE: 9g. CONTACT TELEPHONE NO.: 15. PRIMARY SIC NUMBER: 16. TAXPAYER IDENTIFICATION NUMBER (TIN): 61010 (815) 406-3035 14911 23-3064219 17a. I.D. NO.: 141820AAA 17b. HAS THE OPERATION AS DESCRIBED IN THE FESOP APPLICATION BEEN MODIFIED*

AS DEFINED IN 35 ILL. ADM. CODE 201.1027[] YES 0 NO IF "YES', SUBMIT THE APPLICABLE FORM(S) AND UPDATED FLOW DIAGRAM(S).

17c. DATE THE OPERATION WAS MODIFIED: I- U MODIFICATION:

ANY PHYSICAL CHANGE IN, OR CHANGE IN THE METHOD OF OPERATIONS OF, AN EMISSION SOURCE OR OF AIR POLLUTION CONTROL EQUIPMENT WHICH INCREASES THE AMOUNT OF ANY SPECIFIED AIR CONTAMINANT EMITTED BY SUCH SOURCE OR EQUIPMENT OR WHICH RESULTS IN THE EMISSION OF ANY SPECIFIED AIR CONTAMINANT NOT PREVIOUSLY EMITTED. IT SHALL BE PRESUMED THAT AN INCREASE IN THE USE OF RAW MATERIALS, THE TIME OF OPERATION, OR THE RATE OF PRODUCTION WILL CHANGE THE AMOUNT OF ANY SPECIFIED AIR CONTAMINANT EMITTED. NOT WITHSTANDING ANY OTHER PROVISIONS OF THIS DEFINITION, FOR PURPOSES OF PERMITS ISSUED PURSUANT TO SUBPART 0, THE ILLINOIS ENVIRONMENTAL PROTECTION AGENCY MAY SPECIFY CONDITIONS UNDER WHICH AN EMISSION SOURCE OR AIR POLLUTION CONTROL EQUIPMENT MAY BE OPERATED WITHOUT CAUSING A MODIFICATION AS HEREIN DEFINED, AND NORMAL CYCLICAL VARIATIONS, BEFORE THE DATE OPERATING PERMITS ARE REQUIRED, SHALL NOT BE CONSIDERED MODIFICATIONS.

35 ILL. ADM. CODE 201.102.APC 205A PAGE 2 OF 2 Attachment 2 EVIDENCE OF SIGNATURE AUTHORITY Exelkn.Nudear EXELON GENERATION COMPANY, LLC EVIDENCE OF AUTHORITY TO SIGN ENVIRONMENTAL PERMITS AND OTHER ENVIRONMENTAL RELATED DOCUMENTS The undersigned certifies that he has been appointed an officer of the Exelon Generation Company, LLC and is authorized to act as a corporate representative for the purposes of signing and/or authorizing others to act as corporate representatives for the purpose of signing environmental permit applications, permit required reports, and other representations regarding environmental requirements, including but not limited to those made to Pollution Control Boards, the Illinois Environmental Protection Agency, the Pennsylvania Department of Environmental Protection, the New Jersey Department of Environmental Protection, the United States Corps of Engineers, and the United States Environmental Protection Agency. Based on the authority vested in me as an Exelon Generation Company, LLC Officer, I hereby authorize and appoint the following individuals to act as corporate representative for the purpose of signing environmental permit applications, permit required reports, and other representations regarding environmental requirements, including but not limited to those made to the above listed agencies: Authorized Individuals Charles Pardee Thomas Coutu Dave Hoots Bryan C. Hanson Danny Bost Susan Landahl Timothy Tulon Ron DeGregorlo Timothy S. Rausch Joseph Grimes Title Senior Vice President Exelon Generation Company LLC Site Vice President Braidwood Station Site Vice President Byron Station Site Vice President Clinton Power Station Site Vice President Dresden Station Site Vice President LaSalle Station Site Vice President Quad Cities Station Site Vice President Limerick Generating Station Site Vice President Oyster Creek Site Vice President Peach Bottom APS Page I of2 Authorized Individuals Titl.ee Russell West Site Vice President Three Mile Island Dan Enright Christopher Mudrick Jim Randich Mike Massaro Thomas J. Dougherty Randy Gideon Gregory Boerschig Marseyne Snow Russ Keamey Kent Scott Dave Wozniak Ronald Schuster Zigmund Karpa Kathleen Namors Scott Sklenar Dominic Imburgia Plant Manager LaSalle Station Plant Manager Limerick Generating Station Plant Manager Oyster Creek Plant Manager Peach Bottom APS Plant Manager Three Mile Island Plant Manager Quad Cities Station Plant Manager Braldwood Station Plant Manager Byron Station Plant Manager Clinton Power Station Manager, Regulatory Assurance Clinton Power Station Plant Manager Dresden Station Plant Manager Zion Station Director Environmental Exelon Generation Company LLC Manager, Facilities Exelon Generation Company LLC Manager, Environmental Exelon Generation Company LLC Manager, Environmental Exelon Generation Company LLC Signed: Tkmas S. O'Neill Vice President Regulatory and Legal Affairs Exelon Nuclear Exelon Generation Company, LLC Date: 3 17-/o Page 2 of 2 Attachment 3 EXEMPT AND INSIGNIFICANT EMISSION SOURCES Attachment 3 Emission Unit Size Basis for Insignificance Unit 1 Auxiliary Diesel Feedwater Pump 1500 hp 35 IAC 201.146(i)

Unit 2 Auxiliary Diesel Feedwater Pump 1500 hp 35 IAC 201.146(i)

Emergency Diesel Fire Pump 500 hp 35 IAC 201.146(i)

SX Cooling Tower Makeup Water Diesel Pump 1 228 hp 35 IAC 201.146(i)

SX Cooling Tower Makeup Water Diesel Pump 2 228 hp 35 IAC 201.146(i)

Security Diesel Generator 460 hp 35 IAC 201.146 (i)Illinois Department of Nuclear Safety Generator 600 hp Not controlled by Station River Screen House Communication Tower Propane Generator 47 hp 35 IAC 201.146(i)

Counterflow Natural Draft Cooling Towers (2 total) 1,400,000 gpm 35 IAC 201.146(vv)(2)

Counterflow Induced Draft Cooling Tower (8 cells) 44,000 gpm 35 IAC 201.146(vv)(2)

Diesel Storage Tank 125,000 gal 35 IAC 201.146(n)

Diesel Storage Tank 50,000 gal 35 IAC 201.146(n)

Diesel Storage Tank 2A 50,000 gal 35 IAC 201.146(n)

Diesel Storage Tank 2B 50,000 gal 35 IAC 201.146(n)

Diesel Storage Tank IA 25,000 gal 35 IAC 201.146(n)

Diesel Storage Tank 1B 25,000 gal 35 IAC 201.146(n)

Diesel Storage Tank IC 25,000 gal 35 IAC 201.146(n)

Diesel Storage Tank ID 25,000 gal 35 IAC 201.146(n)

Diesel Generator Fuel Day Tank IA 500 gal 35 IAC 201.146(n)

Diesel Generator Fuel Day Tank 1B 500 gal 35 IAC 201.146(n)

Diesel Generator Fuel Day Tank 2A 500 gal 35 IAC 201.146(n)

Diesel Generator Fuel Day Tank 2B 500 gal 35 IAC 201.146(n)

Unit 1 Auxiliary Diesel Feed Pump Day Tank 500 gal 35 IAC 201.146(n)

Unit 2 Auxiliary Diesel Feed Pump Day Tank 500 gal 35 IAC 201.146(n)

Diesel Fire Pump Day Tank 650 gal 35 IAC 201.146(n)

SX Make-up Pump Diesel Storage Day Tank (OA) 2,000 gal 35 IAC 201.146(n)

SX Make-up Pump Diesel Storage Day Tank (OB) 2,000 gal 35 IAC 201.146(n)

Security Diesel Generator DayTank 500 gal 35 IAC 201.146(n)

Illinois Department of Nuclear Safety Diesel Storage Tank 550 gal Not controlled by Station Diesel Storage Tank (AST) 2,000 gal 35 IAC 201.146(n)

River Screen House Communication Tower Propane Tank 1,000 gal 35 IAC 201.146(uu)

Clean Turbine Oil Tank 20,000 gal 35 IAC 201.146(n)(3)

Dirty Turbine Oil Tank 20,000 gal 35 IAC 201.146(n)(3)

Unit I Turbine Oil Reservoir 15,000 gal 35 IAC 201.146(n)(3)

Unit 2 Turbine Oil Reservoir 15,000 gal 35 IAC 201.146(n)(3)

Diesel Generator Lube Oil Drain Tank 3,000 gal 35 IAC 201.146(n)(3)

Diesel Generator Lube Oil Drain Tank 3,000 gal 35 IAC 201.146(n)(3)

Auxiliary Building Waste Oil Tank 1,000 gal 35 IAC 201.146(n)(3)

Turbine Building Waste Oil Tank 1,000 gal 35 IAC 201.146(n)(3)

Waste Oil Storage Tank 1,000 gal 35 IAC 201.146(n)(3)

Outdoor oil separator 60,000 gal 35 IAC 201.146(n)(3)

WWTP oil separator 2,000 gal 35 IAC 201.146(n)(3)

Circulating Water Pump House oil separator 500 gal 35 IAC 201.146(n)(3)

River Screen House oil separator 500 gal 35 IAC 201.146(n)(3)

Ambient Temperature Parts Washers (9 total) 5-100 gal 35 IAC 201.146(v)

Miscellaneous Welding NIA 35 IAC 201.146(y)

Page 3-1 Attachment 4 EMISSION CALCULATION METHODS Attachment 4 Source Type Emissions Calculations-tons/year (tpy) Ref Boilers-Fuel Oil CO = gal used/yr

  • 0.005 lb CO/gal
  • ton/2000 lb NOx = gal used/yr
  • 0.02 lb NOx/gal
  • ton/2000 lb PM = gal used/yr
  • 0.002 lb PM/gal
  • ton/2000 lb PM 1 0 = gal used/yr
  • 0.001 lb PM 1 0/gal
  • ton/2000 lb S02 = gal used/yr * (0.142 * %S) lb S0 2/gal
  • ton/2000 lb VOM = gal used/yr
  • 0.0002 lb VOM/gal
  • ton/2000 lb Lead = gal used
  • mmBtu/gal
  • 0.000009 lb Lead/mmBtu
  • ton/2000 lb Stationary Diesel Engines>600 hp CO = gal used/yr
  • mmBtu/gal
  • 0.85 lb CO/mmBtu
  • ton/2000 lb 2 NOx = gal used/yr
  • mmBtu/gal
  • 3.2 lb NOx/mmBtu
  • ton/2000 lb PM = gal used/yr
  • mmBtu/gal
  • 0.0697 lb PM/mmBtu
  • ton/2000 lb PM 1 0 = gal used/yr
  • mmBtu/gal
  • 0.0573 lb PM, 0/mmBtu
  • ton/2000 lb SO 2 = gal used/yr
  • mmBtu/gal
  • (1.01 * %S) lb S0 2/mmBtu
  • ton/2000 lb VOM = gal used/yr
  • mmBtu/gal
  • 0.09 lb VOM/mmBtu
  • ton/2000 lb Dry Active Waste Processor

& Rad CO = waste processed lb/yr

  • 0.00449 lb CO/lb waste
  • ton/2000 lb 3 Waste Liquor Volume Reduction NOx = waste processed lb/yr
  • 0.00419 lb NOx/Ib waste
  • ton/2000 lb System PM = waste processed lb/yr
  • 0.000000068 lb PM/hr
  • ton/2000 lb PM 1 0 = waste processed lb/yr
  • 0.000000068 lb PM 1 Wohr
  • ton/2000 lb SO 2 = waste processed lb/yr
  • 0.00000390 lb S0 2/lb waste
  • ton/2000 lb VOM = waste processed lb/yr
  • 0.00487 lb VOM/Ib waste
  • ton/2000 lb Stationary Diesel Engines <600 hp CO = gal used/yr
  • mmBtu/gal
  • 0.95 lb CO/mmBtu
  • ton/2000 lb 4 NOx = gal used/yr
  • mmBtu/gal
  • 4.41 lb NOx/mmBtu
  • ton/2000 lb PM = gal used /yr
  • mmBtu/gal
  • 0.31 lb PM/mmBtu
  • ton/2000 lb PM1o = gal used/yr
  • mmBtu/gal
  • 0.31 lb PM 1 0/mmBtu
  • ton/2000 lb S02 = gal usedlyr
  • mmBtu/gal
  • 0.29 lb S0 2 1mmBtu
  • ton/2000 lb VOM = gal used/yr
  • mmBtu/gal
  • 0.36 lb VOM/mmBtu
  • ton/2000 lb Propane Generators

<10 mmBtu/hr CO = gal used/yr

  • 0.0019 lb CO/gal
  • ton/2000 lb 5 NOx = gal used/yr
  • 0.014 lb NOx/gal
  • ton/2000 lb PM = gal used/yr
  • 0.0004 lb PM/gal
  • ton/2000 lb PM 1 0 = gal used/yr
  • 0.0004 lb PMto/gal
  • ton/2000 lb SO 2 = gal used/yr * (0.0001 * %S) lb S0 2/gal
  • ton/2000 lb VOM = gal used/yr
  • 0.0003 lb VOM/gal
  • ton/2000 lb Natural Draft Cooling Towers PMto = 0.000073 lb PMio/gal water
  • TDS ppm/1,000,000
  • gal/yr
  • ton/2000 lb 6 OR PM 1 0 g gal water/yr
  • TDS mg/L
  • 0.2642 L/gal
  • 0.000002204 lb/mg
  • TDS ppm/l,000,000
  • gal/yr
  • ton/2000 lb 6 OR PM 1 0 = gal water/yr
  • TDS mg/L
  • 0.2642 L/gal
  • 0.000002204 lb/mg
  • ton/2000 ib Diesel Storage Tanks VOM = gal throughput/yr
  • 1/100,000,000
  • CFI 7 Gasoline Storage Tanks VOM = gal throughput/yr
  • 1/350,750
  • CFI 7 Gasoline Dispensing Facilities VOM= gal throughput/yr
  • 0.0117
  • CF2* ton/2000 lb 7 Turbine Oil Storage Tanks VOM= gal throughput/yr
  • 1/100.000,000
  • CFI 7 Turbine Oil Reservoirs VOM= gal throughput/yr
  • 1/100,000,000
  • CFI 7 Lube Oil Tanks VOM= gal throughput/yr
  • 1/100,000,000
  • CFI 7 Waste Oil Tanks/Oil Separators VOM= gal throughput/yr
  • 1/100,000,000
  • CFI 7 Diesel Unloading Area VOM = gal throughput/yr
  • 0.01246
  • S
  • 0.009
  • 130/530
  • ton/2000 Ib 8 Turbine Oil Unloading Area VOM = gal throughput/yr
  • 0.01246
  • S
  • 0.009
  • 130/530
  • ton/2000 lb 8 Gasoline Unloading Area VOM = gal throughput/yr
  • 0.01246
  • S
  • 6.2
  • 66/530
  • ton/2000 lb 8 Parts Washers VOM = 0.33
  • number of units
  • 0.445 9 OR VOM = (gallons added-gallons removed)
  • 8.34
  • ton/2000 lb Sandblasting PM = lb abrasive used
  • 0.00069 lb PM/lb abrasive
  • ton/2000 lb 10 PM 1 o = lb abrasive used
  • 0.00069 lb PM 1 0/lb abrasive
  • ton/2000 lb Welding PM = lb electrode used
  • 0.0448 lb PM/lb electrode
  • ton/2000 lb I I PM 1 0 = lb electrode used
  • 0.0448 lb PM 1 0/lb electrode
  • ton/2000 lb Lead = lb electrode used
  • 0.000081 lb Lead/lb electrode
  • ton/2000 lb Page 4-1

References:

I = USEPA AP-42 Tables 1.3-1, 1.3-3 and 1.3-7 2 = USEPA AP-42 Tables 3.4-1 and 3.4-2 3 = Manufacturer and Commonwealth Edison Test Data in 1982 Permit Application 4 = USEPA AP-42 Table 3.3-1 5 = USEPA AP-42 Table 1.5-1 6 = USEPA AP-42 Table 13.4-1 or Manufacturers Equation where DF=drift factor expressed numerically (not percent)7 = USEPA AP-42 Table 5.2-7 and IEPA 2000 Annual Emission Report Instructions Appendix G Storage Tanks CF1 = 1.00 no controls CF1 = 0.20 for any one (1) of underground, submerged loading and vapor recovery CFI = 0.15 for any two (2) of underground, submerged loading and vapor recovery CF1 = 0.10 if underground, submerged loading and vapor recovery CF2 = I for no Stage II vapor control CF2 = 0.154 for Stage II vapor control 8 = USEPA AP-42 Section 5.2 Equation 1, Table 5.2-1 and Table 7.1-2 S= 0.60 for submerged loading S = 1.45. for splash loading S = 1.00 for Stage I vapor balance system 9 = USEPA AP-42 Tables 4.6-2 and 4.6-3, control efficiency is midpoint of range given for Cold Cleaner Type A SG = specific gravity of solvent 10 = USEPA AP-42 Table 13.2.6-1 11 = USEPA AP-42 Tables 12.19-1 and 12.19-2 (midpoint of SMAW ranges)

Attachment 5 EMISSION INVENTORY Attachment 5 Byron Station Emission Potential Emissions (tons er year) Actual Emissions (tons r ear)**Sources (bold type designates Actual sources not in Potential Annual FESOP) Capacity Annual Use* CO NOx PM PM, 0 SO 2 VOM Lead Use I CO NOx PM PMn 0 S02 VOM Lead Large Combustion Fe Sources Fuel (a)(a Unit I Auxiliary Boiler 93 mmBtu/hr 5819143 14.55 58.19 5.82 2.91 115.68 0.58 0.00 50000 0.13 0.50 0.05 0.03 0.99 0.01 0.00 Unit 2 Auxiliary Boiler 93 mmBtu/hr 5819143 14.55 58.19 5.82 2.91 115.68 0.58 0.00 50000 0.13 0.50 0.05 0.03 0.99 0.01 0.00 Diesel Generator IA 22861hp 3640484 216.61 815.47 17.76 14.60 72.07 22.94 0.00 86000 5.12 19.26 0.42 0.34 1.70 0.54 0.00 Diesel Generator IB 22861 hp 3640484 216.61 815.47 17.76 14.60 72.07 22.94 0.00 86000 5.12 19.26 0.42 0.34 1.70 0.54 0.00 Diesel Generator 2A 22861 hp 3640484 216.61 815.47 17.76 14.60 72.07 22.94 0.00 86000 5.12 19.26 0.42 0.34 1.70 0.54 0.00 Diesel Generator 2B 22861 hp 3640484 216.61 815.47 17.76 14.60 72.07 22.94 0.00 86000 5.12 19.26 0.42 0.34 1.70 0.54 0.00 Rad Waste Volume Reduction System 1.4 mmBtu/hr 0.75 0.10 0.00 0.00 0.16 0.25 0.75 0.10 0.00 0.00 0.16 0.25 Other .25 Combustion Fuel Sources Fuel (sal) ( al)Unit I Auxiliary Diesel Feedwater Pump 1500 hp 238866 14.21 53.51 1.17 0.96 4.73 1.50 0.00 10000 0.60 2.24 0.05 0.04 0.20 0.06 0.00 Unit 2 Auxiliary Diesel Feedwater Pump 1500 hp 238866 14.21 53.51 1.17 0.96 4.73 1.50 0.00 10000 0.60 2.24 0.05 0.04 0.20 0.06 0.00 Emergency Diesel Fire Pum 500 hp 79622 5.29 24.58 1.73 1.73 1.62 2.01 0.00 10000 0.67 3.09 0.22 0.22 0.20 0.25 0.00 SX Cooling Tower Makeup Water Diesel Pump I 228 hp 36308 2.41 11.21 0.79 0.79 0.74 0.91 0.00 10000 0.67 3.09 0.22 0.22 0.20 0.25 0.00 Page 5-1 Attachment 5 Byron Station Emission Sources (bold type designates sources not in FESOP)Other Combustion Sources (con 't)SX Cooling Tower Makeup Water Diesel Pump 2 J _Potential Emissions (tons per year)Actual Emissions (tons ,~r year)* _IV Potential Annual Use*Fuel (gal)36308 Actual Annual Use *Fuel (gal)10000 VnAL 2.41 0.79 0.79 0.74 10.91 10.00 0.67 1 0.22 0.25 10.00 228 hp 11.21 3.09 1 0.22 0.20 I I i --- i -- i Security Diesel Generator 1.59 1 1.59 I I 1 3.09 0.510.001 460 hp 73252 10000 Illinois Dept of Nuclear Safety Diesel Generator 600 hp IUSH Communication Tower Propane Generator 47h 11578 Cooli Towers mW~ater (gal)2 Natural Draft Counterflow Cooling Towers I E+06 gpm 1400000 8 Induced Draft Counterflow Cooling Tower Cells 44000 m 44000 Fuel Storage Tanks Fuel (gal)125000 Diesel Tank gallons 26751205 Diesel Tank 50000 gallons 26751205 Diesel Tank 2A 50000 gallons 3640484 3000 Water (gal)1400000 44000 Fuel (gal)474000 474000 86000 Page 5-2 Attachment 5'V I T r Byron Station Emission Sources (bold type designates sources not in FESOP)Fuel Storage Tanks (con't)Diesel Tank 2B Potential Emissions (tons per year)Actual Emissions (tons peryear)**

Potential Annual Use*Fuel (gal)3640484 50000 gallons Diesel Tank I A 25000 gallons 1820242 Diesel Tank J B 25000 gallons 1820242 Diesel Tank IC 25000 allons 1820242 Diesel Tank ID 25000 gallons 1820242 Diesel Generator fuel oil day tank IA 500 gallons 3640484 Diesel Generator fuel oil day tank 1B 500 gallons 3640484 Diesel Generator fuel oil day tank 2A 500 gallons 3640484 Diesel Generator fuel oil day tank 2B 500 gallons 3640484 Unit I auxiliary feed pump diesel fuel oil day tank 500 gallons 238866 Unit 2 auxiliary feed pump diesel fuel oil day tank 500 gallons 238866 Diesel fire pump fuel oil da tank 650 gallons 79622 Actual Annual Use*Fuel (gal)86000 43000 43000 43000 43000 VOM 86000 86000 86000 86000 10000 10000 10000 Page 5-3 Attachment S I 'I.Byron Station Emission Sources (bold type designates sources not in FESOP)Potential Emissions (tons per year)Actual Emissions (tons per year)**cA.. unuL I Potential Annual Use*Capacity Fuel Storage Tanks (con't) Fuel (gal)SX make-up pump diesel oil storage day tank (OA) 200 gallons 36308 SX make-up pump diesel oil storage day tank (OB) 2000 gallons 36308 Security Diesel Generator fuel oil day tank 500 gallons 73252 illinois Dept of Nuclear Safety Diesel UST 550 gallons Diesel AST 2000 gallons 50000 Gasoline AST and dispensing facility 2500 gallons 17500 RSH Comnmunication Tower propane tank 1000 allons 11578 Other Storage Tanks Organics (gal)Clean Turbine Oil Tank 20000 gallons 80000 Dirty Turbine Oil Tank 20000 gallons 80000 Unit 1 Turbine Oil Reservoir 15000 allons 60000 Unit 2 Turbine Oil Reservoir 15Of)gallons 60000 Actual Annual Use*Fuel (gal)10000 10000 10000 I 50000 17500 3000 Organics (gal)80000 80000 60000 60000 Page 5-4 Attachment 5____________

___________

I Byron Station Emission Sources (bold type designates sources not in FESOP)Other Storage Tanks (con 't)Diesel Generator Lube Oil drain tank Potential Emissions (tons per year)Actual Emissions (tons per year)**hn- V I Potential Annual Use*Organics (gal)3000 gallons 3000 Diesel Generator Lube Oil drain tank 3000 gallons 3000 Auxiliary Building Waste Oil tank 1000 gallons 1000 Turbine Building Waste Oil tank 1000 gallons 1000 Waste Oil storage tank 1000 gallons 1000 Outdoor oil separator 60000 gallons 120000 WWTP oil separator 2000 gallons 4000 CWPH oil separator 500 gallons 1000 RSH oil separator 500 gallon 1000 Actual Annual Use *Organics (gal)3000 3000 1000 1000 1000 120000 I I 4000 1000 1000 Page 5-5 Attachment 5 Byron Station Emission Sources (bold type designates sources not in FESOP) Capacit Parts Washers Vehicle Maintenance Building (BY-BM-16-1) 20 gallons Vehicle Maintenance Building (BY-BM-16-2) 20 gallons EM Shop (BY-EM-25-1) 30 gallons Vehicle Maintenance Building (BY-MM-50-1) 60 gallons Auxiliary Building (CM-05) 5 gallons Mower Shop (BY-FH-25-I) 30 gallons Auxiliary Building (CM-30) 30 gallons MM Shop (BY-MM-5O-2) 30 galons MM Shop 100 gallons Actual Potential Annual Annual Use* Potential Emissions (tons per year) Use

  • Actual Emissions (tons per year)**I Nny IPMlI I ý t~L_ 1.I IPM I I I I Page 5-6 Attachment S Byron Station Emission Sources (bold type designates sources not in Potential Annmiml []p*Actual Annual Use
  • I Actual Emissions (tons per year)**I Wn. I IPA I I Abrasive (lb)500 1000 1000 500 100 Electrodes (lb)0.00 3000 i000 Elect (lb)10i i3000 Page 5-7 Attachment 5 Byron Station Emission Sources (bold type designates sources not in Actual Annual SUse *Potential Annual Use*Potential Emissions (tons per year)Actual Emissions (tons per vear)**I Uses Actual Emissions (tons ner vear)~4 4 4.Fuel I I I PM.. I so, I I INOx I I ISO, 'I Fuel (gal)504000 280000 20000 79622 1 939.71 1 3555.06 1 128.91 1 110.03 1 533.83 1 104.74 1 0.02 I Total 1 25.32 1 95.00 1 41.73 1 41.36 1 10.17 1 5.09 1 0.00 1 i ....Page 5-8 Attachment 5* Potential and Actual Use based on 140,000 Btu/gallon of Distillate Oil (Diesel) and 90,500 Btu/gal of propane.** Actual Use and Emissions are configured in the Table for demonstration purposes only.For example, large Diesel Generator use is capped at 344,000 gallons that may be distributed in various ways across the four units.Likewise, storage tank throughputs represent only one of many possible configurations.

However, total fuel consumed in combustion units and total fuel throughput in storage tanks will not exceed the values presented as a whole.*** Sources controlled by governmental units are not considered in Station inventory per instruction of Chris Romaine, Illinois EPA on Feb 22, 2001.Page 5-9

.... Exelonm Exelon Generation www.exeloncorp.com Nuclear Byron Generating Station 4450 North German Church Road Byron, IL 61010-9794 Tel 815-234-5441 December 10, 2007 LTR: BYRON 2007-0139 File: 2.09.0810° 1.10.0101 Mr. Bruce Beasly Illinois Environmental Protection Agency Division of Air Pollution Control Permit Section 1021 North Grand Avenue East P.O. Box 19506 Springfield, Illinois 62794-9506

Subject:

FESOP Renewal Application Byron Nuclear Power Station Exelon Generation Company, LLC Application No: 78090018 I.D. No. 141820AAA

Dear Mr. Beasly:

On September 11, 2007, an application for renewal of the subject permit was submitted to the Agency.The emission sources identified in the permit are primarily for the purpose of providing altemate electrical supplies (diesel generators) and altemate steam sources (auxiliary boilers).

During normal operating conditions, the diesel generators and auxiliary boilers are not required to operate. To conform to the facility's operating license issued by the Nuclear Regulatory Commission (NRC), large diesel engines and auxiliary boilers are operated at a prescribed frequency to demonstrate and assure operational readiness.

Although the FESOP conditions accommodate a reasonable amount of distillate fuel oil consumption to allow for readiness testing and equipment maintenance, the conditions do not accommodate the range of operational dynamics that may occur.In October 2007 a water leak occurred in the essential cooling water system that resulted in the need to operate the auxiliary boilers to provide a steam supply to the plant while repairs were undertaken.

Due to the time required to affect the necessary repairs, the monthly and annual auxiliary boiler distillate fuel oil consumption was greater than 34,000 gallons and 100,000 gallons, respectively (resulting additional emissions were minimal).Notwithstanding unforeseen circumstances, the resulting facility wide maximum annual emissions will still not challenge the 100-ton NOx limit (most restrictive permit parameter) applicable to a FESOP.To better address the operational flexibility of the auxiliary boilers in the future, it is proposed to increase the auxiliary boiler distillate fuel oil use. In order to maintain the current permitted facility emissions, a reduction in the permitted distillate fuel oil use by the large diesel engines is proposed.

December 10, 2007 Mr. Bruce Beasly Page 2 The following table summarizes the proposed permit limitation changes.CURRENT Auxiliary Boiler Permit Limits PROPOSED Auxiliary Boiler Permit Limits Permitted Fuel Use Proposed Fuel Use 100,000 Gallons/yr

-210,000 Gallons/yr 34,000 Gallons/month

.no monthly limit Gallons/month NOR-Or I gallonlmonth!

Permitted Emissions Proposed Emissions Emission Rate Emissions

~ Emission Emissions Pollutant (Lmll,000 Rate Emssonsyr Pollutant Rate (Lb/1,000 Emsin U(Lb,000 Gal) (Tonsyr) ouGal) (Tons/yr)NOx 20 1.00 NOx 20 2.10 CO 5 0.26 CO 5 0.53 S02 39.78 1.98 S02" 7.1 0.75 VOM 0.2 0.01 VOM 0.2 0.02 PM 2 0.10 PM 2 0.21 W "10"ki'p, *Byron Station uses Low and Ultra Low Sulfur Fuels CURRENT Large Diesel Permit Limits PROPOSED Large Diesel Permit Limits Permitted Fuel Use Proposed Fuel Use 364,000 Gallons/-r 340,000 G /y--sr.72,800 ]Gallons/month no monthix limit Glos/month Permitted Emissions Pro osed Emissions Emission Emission Rate Emissions Rate Emissions Pollutant IlblmmBTU) (Tonslyear)

Pollutant (IblmmBTU) (Tons/year)

NOx 3.2 81.52 NOx 3.2 76.16 CO 0.85 21.68 CO 0.85 20.23 S02 0.2828 7.20 S02" 0.0505 1.20 VOM 0.09 2.28 VOM 0.09 2.14 PM 0.0697 1.78 PM 0.0697 1.66 R *--Byron Station uses Low and Ultra Low Sulfur Fuels Recognizing that the large diesel engines and auxiliary boilers are intended solely to provide back-up electrical and steam sources to the Station, historical distillate fuel oil use has been limited. For the period 2002 through 2006, the annual average distillate fuel oil consumption by the large diesel engines has been 106,000 gallons. For the same period the annual average auxiliary boiler distillate fuel oil consumption was 32,200 gallons.Byron Station intends to maintain and operate the auxiliary boilers and large diesel engines as in the past, which has resulted in minimal air emissions from the facility.

It December 10, 2007 Mr. Bruce Beasly Page 3 Byron Station requests that: 1. Distillate fuel oil use by the auxiliary boilers to be increased to 210,000 gallons per year.2. Eliminate the monthly distillate fuel oil consumption limitations.

On September 11, 2007, Exelon Generation Company applied for renewal of the Byron Nuclear Station's FESOP permit, which expires December 13, 2007. In order to accommodate the foregoing, it is requested that a renewed permit be issued as soon as practicable.

However, at your request, Exelon Generation Company, LLC hereby waives the statutory 180 day final decision deadline date for the above referenced Operating Permit application renewal and agrees to a new due date of June 13, 2008.We would appreciate the Agency's timely consideration of our request. If additional information or a meeting is required, please contact Zoe Cox at (815) 406-3035.Respectfully, Marseyne Snow Byron Nuclear Generating Station Plant Manager MS/KH/ZC/sdk cc: Illinois Environmental Protection Agency Division of Air Pollution Control 5415 North University St.Peoria, IL 61614 bcc: Z. Cox-Environmental Specialist-Byron K. Hersey-Senior Environmental Specialist-Cantera Exelkn.Exelon Generation www.exeloncorp.com Nuclear Byron Generating Station 4450 North German Church Road Byron. IL 61010-9794 Tel 815-234-5441 June 1, 2008 LTR: BYRON 2008-0060 File: 2.09.0810 1.10.0101 Mr. Bruce Beasly Illinois Environmental Protection Agency Division of Air Pollution Control Permit Section 1021 North Grand Avenue East P.O. Box 19506 Springfield, Illinois 62794-9506

Subject:

FESOP Renewal Application Byron Nuclear Power Station Exelon Generation Company, LLC Application No: 78090018 I.D. No. 141820AAA

Dear Mr. Beasly:

On June 10, 2008 the Agency requested via voice mail an extension to the deadline to renew Byron Station's FESOP. Per your request, Exelon Generation Company, LLC hereby waives the statutory 180 day final decision deadline date for the above referenced Operating Permit application renewal and agrees to a new due date of September 19, 2008. In doing so we request the permit changes, submitted to the Agency in December 2007 under Byron Letter 2007-0139, are considered for inclusion in the renewal of the FESOP.We would appreciate the Agency's timely consideration of our request. If additional information or a meeting is required.

please contact Zoe Cox at (815) 406-3035.Respectfull, Bradley. Adams Byron Nuclear Generating Station Plant Manager CC: Illinois Environmental Protection Agency Division of Air Pollution Control 5415 North University St.Peoria, IL 61614 Bcc: Z. Cox-Environmental Specialist-Byron K. Hersey-Senior Environmental Specialist-Cantera Byron Environmental Audit -Request for Additional Information Response Question #: Met-2 Category:

Meteorology, Air Quality and Noise Statement of Question: Provide copies of Byron's annual air emission reports for the most recent five years.Response: The requested information is attached.List Attachments Provided: 1. 2012 Annual Emission Report for Byron Generating Station 2. 2011 Annual Emission Report for Byron Generating Station 3. 2010 Annual Emission Report for Byron Generating Station 4. 2009 Annual Emission Report for Byron Generating Station 5. 2008 Annual Emission Report for Byron Generating Station Exektn.Exelon Generation Company, iLC www.exeloncorp.com Byron Station Nuclear 445o North German Church Road Byron. IL 61o0o-9794 February 21, 2013 LTR: BYRON 2013-0014 File: 2.09.0810 1.10.0101 Illinois Environmental Protection Agency Bureau of Air Air Quality Planning Section (#39)1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Attn: Annual Emission Report

Subject:

2012 Annual Emission Report In accordance with the requirements of 35 Illinois Administrative Code Part 254, "Environmental Protection

-Annual Emissions Reporting Rule," Exelon Generation Company hereby submits the 2012 Annual Emissions Report for Byron Station, ID No. 141820AAA.

Included in the Annual Emissions Report are the following:

1. Annual Source Emission Summary 2. Annual Source Emissions Forms If you have any questions regarding this matter, please contact Ms. Zoe Cox, Environmental/Radwaste Supervisor, at (815) 406-3035.Respectfully, BenjaminP.

Youmar Plant Manager Byron Nuclear Generating Station BPY/JG/eh Attachment bcc: K. Hersey -Environmental

-Cantera (electronic)

J. Golich -Environmental

-Byron Station BYRON GENERATING STATION 12 A I I J IRe_____________________

~ ~ ~ 40 _____________

p..avactiPatIgi CIOIS a Slacks, Pama_______Description Conltrol Ccn05el Desciphtihn EIck* ____ EMISSIONS TONSWM_____

_________

_______ ______________________CO NO)( PART PHI0 PU2.8 SG VOU 504)3 hMmuan Nm 0001 Large D_ _sel _____ NIA NIA I 01 to 0004. O 3. 0024 7.46 2 0 0 .61 0.50 0.50 0.01 0.79 0.05 1448.57 W A W A 0002 2 Aud___ __ ___ _ NIA NIA 0005 00U6 0.01 0.04 0.00 0.00 0.00 0.00 0.00 0.00 48.652 0.00 0.00 0007 Red Wast Volum e RAcdUCin System 0001 Venti Saubbr NIA WA NFA NIA NIA NIA 0.00 NIA NIA NIA MIA NIA_002 HEPA Fir 0007 A NIA 0.00 0.00 0.00 IWA NIA NWA WiA NA WA 000_ Gas Sold SeW3-aI NIA WA NIA 0.00 0.00 0.00 NWA N/A NWA NIA NIA WA 0004 Activated Clu.moal NIA NIA N/A NIA WIA NIA NA 0.00 NA WA WA WA 0012 GaScRF1o iSra gea n Haf t 0005 Va o Coned Sy te 0019 W A NIA NIA A N/A NIA 0.10 N/A NIA NIA NIA 0013 Smau Des_ E n_ i es NIA NIA 0020 0.0 0.16 0.01 0.01 0.0i 0.01 0.01 0.00 5.80 WA WA 0014 Coo" TomNturai D Orem WA WVA 0021 NWA NWA 21.94 21.94 21.94 NWA NWA WIA WA NWA NWA 0014 Cooing Tow-r-4tckwcet

! WA WA 002 WA NWA 0.67 0.67 0.67 WIA WIA WIA NIA N/A NWA_oW 7.51 2.21 23.24 23.13 22.12 0.02 0.90 0.0 1501.03 0.00 0.0 Sourc 2012 Fou Canuumlion

__ _ l~ ~ ~~00110"_

_ _ _ _ __ _ __________ _Them were no exceeclences of any ann ual permit requirements during Uth calendar yea 2012 addrssed In this report.Downm 4.2 LUng. Olame smau Dieselo_ __

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 1 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-SOURCE DATA -SOURCE IDS AND LOCATION SOURCE ADDRESS ANNUAL EMISSION REPORT MAILING ADDRESS AIRS: 17-141-0069 FINDS: ILD984889907 FEIN: 360938600 D&B: 000-692-9509 LATITUDE:

42:04:27.0372 LONGITUDE:

89:16:58.4616 IEPA USE ONLY IEPA USE ONLY SIC 1: SIC 2: SIC 3: SIC 4: SIC 5: SIC 6: 4911 NAICS 1: NAICS 2: NAICS 3: NAICS 4: NAICS 5: NAICS 6: 221113 Exelon Generation Co LLC CONTACT: Zoe-ee-'-

1C- f 6; Pc.LA PHONE:

3-4a EXT: FAX: 815-406-3301 4450 N German Church Rd E-MAIL: Byron, IL 61010 Exelon -Byron Generating Station CONTACT: 8be--AE e fe6 A PHONE: 815-406-30&&-

& A EXT: FAX: 815-406-3301 4450 N German Church Rd E-MAIL: Byron, IL 61010 Any person who knowingly makes a false, fictitious, or fraudulent material statement, orally or in writing, to the Illinois EPA commits a Class 4 felony. A second or subsequent offense after conviction is a Class 3 felony. (415 ILCS 5/44(h))I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted.

Based on my inquiry of the person or persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate and complete.

iGNATV ' DATE TYPED) OR AME AND TITLE NUMBER The Illinois EPA is authorized to require, and you must disclose, the information on this form pursuant to 35 Ill. Adm.Code 201.302(a, b) and 254. It is not necessary to use this form in providing the information.

Failure to disclose the information may result in penalties as provided for in the Environmental Protection Act, 415 ILCS 5/24-45.

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 2 Date: 11-26-2012 141820AAA

-Bxelon Generation Co LLC POLLUTANT CODE Co C02 METHANE N20 NH3 NOX PART PM10 PM2.5 S02 VOM SOURCES REPORTED EMISSIONS FOR 2012 (TONS/YEAR)

-7.51 6.0 6.0.0y 2,3. 7(t 20,-ANNUAL SOURCE EMISSIONS

-ALLOWABLE EMISSIONS (TONS/YEAR) 25.362960 39,591.686400 0.436800 0.131040 1.438080 94.975356 41.662992 41.058192 25.479384 10.126704 5.035766 EMISSIONS REPORTED FOR 2011 (TONS/YEAR)

5.650000 1,100.900000 0.000000 0.000000 0.040000 21.300000 21.210000 21.130000 21.130000 0.020000 0.670000 IEPA 2012 ESTIMATED EMISSIONS (TONS/YEAR) 6.058557 2,963.898270 0.022680 0.006804 0.113630 22.784417 39.403404 39.382812 23.907786 2.109257 2.507895 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 3 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-PERMIT LISTING -PERMIT NUMBER 78090018 TYPE OF PERMIT FESOP OPERATION NAME.....RON......GE.....ER....T...........STA......ION...

BYRON GENERATING STATION STATUS STATUS DATE GRANTED 12-13-2002 EXPIRES 12-13-2007 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 4 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

BEGAN OPERATION:

09 / 1978 CEASED OPERATION:

/FUEL TYPE: 21 DISTILLATE OIL #2 INPUT (MMBTU/HR):

232.8 DEC -FEB: JUN -AUG: 29.12 %_____MAR_

MAY: 29.05 _ _ SEP -NOV: 21.28 20.55 2 -1,77 HEAT CONTENT: 139000 Btu/gal SULFUR CONTENT (V): 0.05 ASH CONTENT (M): NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED 3~j,r3P7 00 UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

6.0 HOUL ROS/DAY: DAYS/WEEK:

1.0 leo DAYS/WEEK:

WEEKS/YEAR:

52 52. WEEKS/SEASON:

HOURS/YEAR:

308 .7 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.3120 ,_ _ __ RATE/HR:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 5 Date: 11-26-2012 141820ALL

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE CO C02 NH3 NOX PART PM10 PM2.5 S02 VOM POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22600.85 .k 5.85 3.2 3,.0697 ., (,(, _ 7.0573 ,Us-? 3()0-V 71.002 ,0o.09 0__5 32.26 6102.258 121.3 2.65 2.54 2.39 10.71 2.65 36.49 37,3_ f 7083.9 /,__ a_ _.038 ,____ '137.38 -2.99 7__ __7 _2.46 _ _ _ _ _2.46 "__ ,__._.09 ,_ _ _3.86 _ ,__ ' _METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX 3 VOM 3 CAPTURING CONTROLS: CAPTURING STACKS: 3.2.09 130.29 3.66 STACK STACK 0001 0002 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

16.70 %16.70 %STACK 0003 CAPTURE EFFICIENCY:

16.70 %_

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 6 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001 6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 197.8/MODE 01 CAPTURING STACKS: STACK 0004 STACK 0023 STACK 0024 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

16.70 16.60 16.60 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 7 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002-2 AUXILIARY BOILERS PERMIT: 78090018 SCC: 10100501 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978 MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 31.50 % MAR -MAY: 34.80 %BEGAN OPERATION:

09 / 1978 JUN -AUG: 33.70 % d-c SEP -NOV: 0.00 % ?. &CEASED OPERATION:

/FUEL TYPE: 21 DISTILLATE OIL #2 HEAT CONTENT: 139000 Btu/gal -? 5- 7?SULFUR CONTENT (M): 0.05 0 c INPUT (MMBTU/HR):

93 _____ASH CONTENT (M): NITROGEN CONTENT (M): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

2.0 q. r HOURS/DAY:

DAYS/WEEK:

1.0 1 DAYS/WEEK:

WEEKS/YEAR:

4 1 WEEKS/SEASON:

HOURS/YEAR:

8 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.0620 _ 2,)() RATE/HR:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMUSSIONS REPORT -2012 Page: 8 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978/MODE 01 POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED Co C02 METHANE N20 NH3 NOX PART P1I10 PM2.5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22300.28.11 S 22300.052.11.8 20 2 1.25.28.252 o2.0 ,lq.06 8028.1.03.288.23.023.023.0155.453.0023.3 1376.5.003.007.048 1.2.12.06.015.017.015 1,1'!.?.S'O 9 S rs J.o2.5 5-~7 _L/S ,c05r7 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX 3 VOM 3 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0005 20.252 1.194.015 CAPTURE EFFICIENCY:

50.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 9 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978/MODE 01 CAPTURING STACKS: STACK 0006 CAPTURE EFFICIENCY:

50.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS RBPORT -2012 Page: 10 Date: 11-26-2012 141S20AAA

-Exelon Generation Cc LLC-FUEL COMBUSTION DATA -POINT 0013-SMALL DIESEL ENGINES PERMIT: 78090018 SCC: 20200101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

I BEGAN OPERATION:

CEASED OPERATION:

FUEL TYPE: 21 INPUT (MMBTU/HR):

PERCENT THROUGHPUTS:

DISTILLATE OIL #2 4.1 DEC -FEB: JUN -AUG: 23.90 42?.Y( MAR -MAY: 26.05 % _ SEP -NOV: 10.51 _z;-,/39.54 W HEAT CONTENT: 139000 Btu/gal SULFUR CONTENT (t): 0.05 ASH CONTENT (%): NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED R4 07 ,001 UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

0.8 04 HOURS/DAY:

DAYS/WEEK:

1.0 7. b DAYS/WEEK:

WEEKS/YEAR:

52 2" WEEKS/SEASON:

HOURS/YEAR:

39 HOURS/SEASON:

START TIME: END TIME: RATE/H.: 0.0141 .1 RATE/HR:.

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANIMAL EMISSIONS REPORT -2012 Page: 11 Date: 11-26-2012 141820AAA Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0013 SMALL DIESEL ENGINES BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 20200101 09 / 1978 MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 NH3 NOX PART PM10 PM2.5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 21800.95 164.8 4.41.31.31.31.29.36 31 3.99 632.2.01 18.39.52.52.52 1.19 1.49 1.84 /,_70 317.1 ,.01 ,81 8.53 .6 ,__ _ _".56 _ _ _.56 S-2y POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED 9.28.76 S NOX 3 VOM 3 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0020 4.41.36 CAPTURE EFFICIENCY:

100.00 1; R~eport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 12 Date: 11-26-2012 141820AAA

-Exelon O.~eration Cc LLC-PROCESS DATA -POINT 0007 -RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:'

DEC -FEB: 25.00 w 6 MAR -MAY: 25.00 % 6 BEGAN OPERATION:

/ JUN -AUG: 25.00 % b SEP -NOV: 25.00 % 0 CEASED OPERATION:

/UNITS: TONS BURNED UNITS: TONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

0.0 ) HOURS/DAY:

DAYS/WEEK:

0.0 DAYS/WEEK:

WEEKS/YEAR:

0 WEEKS/SEASON:

HOURS/YEAR:

0 HOURS/SEASON:

START TIME: PWR (LB/HR): 0.0000 ,O6ob END TIME: RATE/HR: 0.0000 0PWR (LB/HR):_RATE/HR:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 13 Date: 11-26-2012 141820AAA-Exelon Generation Co LLC-PROCESS DATA -POINT 0007 RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO NOX S02 VOM 3 3 3 3 3 3 3 3.98.131.0004.0062 0 0 0 0 6 0 C)POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED NOX VOM 3 3 OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED 0 0 100.00 %CAPTURING CONTROLS: CONTROL 0003 CAPTURE EFFICIENCY:

CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 14 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012 -GASOLINE STORAGE AND HANDLING PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/TANK TYPE: ABOVEGROUND CAPACITY DIAMETER (FT): HEIGHT (FT): LENGTH (FT): VAPOR SPACE (FT): 2500 gal TEMPERATURE (F): 10.0 ROOF COLOR: 10 SHELL COLOR: ROOF PAINT CONDITION:

1.5 SHELL

PAINT CONDITION:

70 WHITE WHITE GOOD GOOD LOCATION:

ABOVEGROUND SEAL TYPE: DOUBLE SUPPORT TYPE: CONCRETE MATERIAL MWT VP (psia)--------------

THROUGHPUTS DENSITY ANNUAL(gallons)

PEAK OZONE(gallons) 0,IfTid%, &Q450 J;Ae AJ14 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 15 Date: 11-26-2012 141820AAA

-Exolon Generation Co LLC-STORAGE TANK DATA -POINT 0012 MODE 01-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: 33.00

  • MAR -MAY: 18.60 *BEGAN OPERATION:

12 / 1998 JUN -AUG: 21.60 & YO SEP -NOV: 26.80 % I CEASED OPERATION:

/UNITS: 1000 GALLONS THROUGHPUT UNITS: 1000 GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 2HO, 0 UORS/DAY: DAYS/WEEK:

7.0 70 DAYS/WEEK:

WEEKS/YEAR:

52 52, WEEKS/SEASON:

HOURS/YEAR:

8,760 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.0011 e 60 Ii RATE/HR:

Report: APCAOS30 Illinois Enviro atal Protection Agency Division of A ?ollution Control DAPC -ANNEAL EM1SSIONS REPORT -2012 Page: 16 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012 MODE 01 POLLUTANT CODE VOM-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED.46.0142 , 3 3 POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED--------------

VOM 3 CAPTURING CONTROLS: OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED.18 CONTROL 0005 CAPTURING STACKS: CAPTURE EFFICIENCY:

100.00 W Report: APCAOS30 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 sage: 17 Date:

141820AAA

-Exelon Generation Co LLC-OTHER SOURCE DATA -POINT 0014-2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC:, 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1970/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 V a MAR -MAY: 25.00 %W_BEGAN OPERATION:

09 / 1977 JUN -AUG: 25.00 % SEP -NOV: 25.00 %_____CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 2> o HOURS/DAY:

DAYS/WEEK:

7.0 7,0 DAYS/WEEK:

WEEKS/YEAR:

52 52.. WEEKS/SEASON:

HOURS/YEAR:

8,760 IIII ---i HOURS/SEASON:

START TIME: END TIME: RATE/HR: 84.0000 Y, RATE/HR:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 18 Date: 11-26-2012 141820ALA

-Exelon Generation Co LLC-OTHER sOURCE DTA -POINT 0014 -2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM10 Pb2 .5 3 3 3 3 3 3 8.38 8.38 5.2 4.59 4.59 4.59 CS~POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0021 CAPTURE EFFICIENCY:

100.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 19 Date: 11-26-2012 14182OAkA

-Exelan Generation Co LLC-OTHER SOURCE DATA -POINT 0015 -8 INDUCED DRAFT COOLING TOWERS PERMIT: 18090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 IDESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 25.00 W K MAR -MAY: 25.00 i -" SEP -NOV: 25.00 2_iS-25.00 ;! zS-BEGAN OPERATION:

CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLIbN GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 2_ Y,_ _ HOURS/DAY:

DAYS/WEEK:

7.0 20 DAYS/WEEK:

WEEKS/YEAR:

52 rjl WEEKS/SEASON:

HOURS/YEAR:

8.760 _ _ __7& HOURS/SEASON:

START TIME: END TIME: RATE/HR: 2.6400 _,_ RATE/HR:

Repor~t: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 20 Date: 11-26-2012 3.41820&A" -Exelon Generationx Co LLC-OTHER SOURCE DATA -POINT 0015-8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE PART PM10 PM2.5 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED 3 3 3 3 3 3.526.526.17.14.14.14"5-" ,1[-METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0022 CAPTURE EFFICIENCY:

100.00 %

Report: APCAOS30 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 21 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0001 -Venturi scrubber PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 129 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED S02 99.800-____ 3 CAPTURING CONTROLS: CONTROL 0004 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 22 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0002 -HEPA FILTER PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 101 I DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT PART EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED 99.000 3 PM10 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0007 CAPTURE EFFICIENCY:

100.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 23 Date: 11-26-2012 141820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0003 -GAS SOLID SEPARATOR PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 059 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT PART EFFICIENCY IEPA REPORTED 99.990 METHOD 1EPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED 3 CAPTURING CONTROLS: CONTROL 0001 CAPTURE EFFICIENCY:

100.00 CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 24 Date: 11-26-2012 141820AAA

-Exelon Generation Cc LLC-CONTROL DEVICE DATA -CONTROL 0004 ACTIVATED CHARCOAL PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982 CONTROL CODE: 048 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED VOM 98.000_____ 3 CAPTURING CONTROLS: CONTROL 0002 CAPTURE EFFICIENCY:

100.00 ?CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 25 Date: 11-26-2012 141620AhA

-Exelozi Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0005 -Vapor recovery system i BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 12 / 1998/CONTROL CODE: 110 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED VOM 99.000 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0019 CAPTURE EFFICIENCY:

100.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EM18SIONS RBPORT -2012 Page:. 26 Date: 11-26-2012 141820AA -Exelon Generation Co LLC STACK 0001-STACK DATA -HEIGHT (FT)DIAMETER (FT)-1A DIESEL GENERATOR 2.90-1B DIESEL GENERATOR 2.90 FLOW RATE (ACFM).......................

TEMPERATURE (F)133 21296 950 0002 133 21296 950 0003 -2A DIESEL GENERATOR 2.90 0004 -2B DIESEL GENERATOR 2.90 0005 -Ul AUXILIARY BOILER 3.70 0006 -U2 AUXILIARY BOILER 3.70 133 21296 950 133 140 140 21296 34468 34468 11537 2 950 515 515 728 0007 -RADWlASTE VOLUME REDUCTION 2.70 57 0019 -GASOLINE STORAGE AND HANDLING POINT 00012 0.20 14 0020 -SMALL ENGINES TYPICAL 2.50 29 70 16397 368 Report: APCAOS30 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 27 Date: 11-26-2012 141820AA -Exelon Generation Co LLC STACK 0021-STACK DATA -DIAMETER (FT) HEIGHT (FT)COOLING TOWER NATURAL DRAFT 14.90 57 0022 -COOLING TOWERS, 8 INDUCED DRAFT 14.20 30 0023 -lB AUXILIARY DIESEL FEEDWATER PUMP 0.83 103 FLOW RATE (ACFM)361801 282068 2800 2800 TEMPERATURE (F)76 85 612 0024 2B AUXILIARY DIESEL FEEDWATER PUMP 0.83 103 612 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2012 Page: 28 Date: 11-26-2012 141820A/A

-Zzelon Generation Co LLC Exelkn.Exelon Generation Company. LLC www.exeloncorp.com Nuclear Byron Station 445o North German Church Road Byron, IL 61o10-9794 April 26, 2012 LTR: BYRON 2012-0050 File: 2.09.0810 1.10.0101 Illinois Environmental Protection Agency Bureau of Air Air Quality Planning Section (#39)1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Attn: Annual Emission Report

Subject:

2011 Annual Emission Report In accordance with the requirements of 35 Illinois Administrative Code Part 254, "Environmental Protection

-Annual Emissions Reporting Rule," Exelon Generation Company hereby submits the 2011 Annual Emissions Report for Byron Station, ID No. 141820AAA.

Included in the Annual Emissions Report are the following:

1. Annual Source Emission Summary 2. Annual Source Emissions Forms Byron Station has boilers that are subject to the boiler MACT requirements (40 CFR 63 Subpart JJJJJJ). Initial notification of boiler activity was submitted to the Illinois Environmental Protection Agency in January 2012. Notification of compliance status will be submitted by the July 2012 regulatory deadline (40 CFR 63.11225).

If you have any questions regarding this matter, please contact Ms. Zoe Cox, Environmental/Radwaste Supervisor, at (815) 406-3035.Respectfully, Benjamin P. Youman Plant Manager Byron Nuclear Generating Station BPY/ZC/eh Attachment bcc: Jennifer Gould -Environmental

-Cantera (electronic)

Zoe Cox -Environmental

-Byron Station BYRON GENERATING STATION.,,_awSnav d Pa1,1L Coansao & Stocak II I I -I I I Pointe PobS cooke a co oan ~m Stok 0 EMUSSIGOS co ,fOX PART PUNS Ph2.= SO2 VOm NH3I CO2 e 1420 0001 LaW Diuelsel m WA WA 1000 to 0004. 000 0024 5.61 21.12 0.46 0.38 0.38 0.01 0.59 0.4 1069.15 WA WA 0002 2 Awft" BOHM WA WA 0005 and 0006 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 5.575 0.00 0.00 0007 Rad Wam VoAm Rediction ystam 0001 Venbot Scrubbe WA WA WA WA WA WA 0 WA WA WA WA WA 0__ _2 HEPA FIRr 0007 WA WA 0 0 0 WA WA WA MA MA WA_00M Gm Safil SOrs0 WA WA WA 0 0 0 WA WA MA MA WA WA 0004 Ackvaed ClocaI NIA WA WA NWA WA WA NA 0 WA WVA MA WA 0012 Gandmn Stmage and Hand 0005 V8 m Cotl Syston 0019 WA WA MA NWA MA MA 0.06 WA W/A WA WA 0013 Smog DiDs Enpinews WA WA 0020 0.04 0.17 0.01 0.01 0.01 0.01 0.01 O0. 6.20 WA WA 0014 Cooig TO.Nafrlau Draft WA WA 0021 WA WA 20.11 20.11 20.11 WA WA WVA WA WA WA 0014 Commn Tmomr4-rduced Daft WA WA 0022 WA WA 0.63 0.63 0.63 WA NWA WA WA WA WA ToWl L.O5 21.30 2121 21.13 21.13_ 0.2 0.67 0.04 1100.92 0.00 0.00 Soarce 2011 Fuem Cohaaugpdon 10001w]Auxidauy Boom oLs_ _ _ _ __ Ther waen no exabedences of any annual permiu rmquinents durng the calendar 2011 addressed In ths ro__t.Lnal eand SmB on"__ _n~e _ _ _O_ _ _I _ _ _ _ _ _ _ _ -_

puru.: osA"UUmzlU illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 1 Date: 11-29-2011 1820AAA -Exelon Generation Co LLC-SOURCE DATA -URCE'S AND CATION'URCE.'DRESS IUAL IISSION:PORT ILING 1DRESS AIRS: 17-141-0069 IEPA USE ONLY SIC 1: 4911 NAICS 1: 221113 FINDS: ILD984889907 IEPA USE ONLY SIC 2: NAICS 2: FEIN: 360938600 SIC 3: NAICS 3: D&B: 000-692-9509 SIC 4: NAICS 4: LATITUDE:

42:04:27.0372 SIC 5: NAICS 5: LONGITUDE:

89:16:58.4616 SIC 6: NAICS 6: Exelon Generation Co LLC CONTACT: Zoe Cox PHONE: 815-406-3035 EXT: FAX: 815-406-3301 4450 N German Church Rd E-MAIL: Byron, IL 61010 Exelon -Byron Generating Station CONTACT: Zoe Cox PHONE: 815-406-3035 EXT: FAX: 815-406-3301 4450 N German Church Rd E-MAIL: Byron, IL 61010 Any person who knowingly makes a false, fictitious, or fraudulent material statement, orally or in writing, to the Illinois EPA commits a Class 4 felony. A second or subsequent offense after conviction is a Class 3 felony. (415 ILCS 5/44(h))E certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information 3ubmitted.

Based on my inquiry of the person or persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate and complete.A DATE TBEnDP. You ma #M AD TIlaTEMTEer g16 9404-3100E TYPED MPRINTED NAME AND TITLE TELEPHONE NUMBER The Illinois EPA is authorized to require, and you must disclose, the information on this form pursuant to 35 Ill. Adm.Code 201.302(a, b) and 254. It is not necessary to use this form in providing the information.

Failure to disclose the information may result in penalties as provided for in the Environmental Protection Act, 415 ILCS 5/24-45.

Page: 2 port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 2 11-29-2011 1820AAA -Hzelon Generation Co LLC POLLUTANT CODE---------------------

Co C02.4ETHANE N20 NH3 NOX PART PM10 PM2.5 S02 VOM SOURCES REPORTED EMISSIONS FOR 2011 (TONS/YEAR) 0 0 o4o Al. Al/21. .Azi. 3 0.01Z-ANNUAL SOURCE M BISSIONS -ALLOWABLE EMISSIONS (TONS/YEAR)

25.362960 39,591.686400 0.436800 0.131040 1.438080 94.975356 41.662992 41.058192 25.479384 10.126704 5.035766 EMISSIONS REPORTED FOR 2010 (TONS/YEAR) 5.660000 1,099.150000 0.000000 0.000000 0.040000 21.350000 20.500000 20.420000 20.420000 0.020000 0.710000 IEPA 2011 ESTIMATED EMISSIONS (TONS/YEAR) 6.798947 2,963.898270 0.022680 0.006804 0.113630 22.883387 39.403404 39.382812 23.907786 2.109559 2.512579

jJULJ1t flr~vjQU~Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 3 11-29-2011 I1820AAA -felon Generation Co LLC-PERMIT LISTING -RMIT MBER TYPE OF PERMIT FESOP OPERATION NAME BYRON GENERATING STATION STATUS STATUS DATE GRANTED 12-13-2002 EXPIRES 12-13-2007 tport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 4 Date: 11-29-2011 11820AAA -Exelon Generation Co LLC-FURL COMBUSTION nATA -?OINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978!40DE 01)ESCRIPTION CORRECTION:

I BEGAN OPERATION:

EASED OPERATION:

'TEL TYPE: 21:NPUT (MMBTU/HR):

PERCENT THROUGHPUTS:

09 / 1978 DISTILLATE OIL #2 232.8 DEC -FEB: JUN -AUG: 28.52 k q2.I_ MAR -MAY: 29.14 6Aq.05SEP

-NOV: 20.00 % "_22.34 W2-5 HEAT CONTENT: 139000 Btu/gal 137' -7 SULFUR CONTENT (M): 0.05 O.OOZ ASH CONTENT (%)M: NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

6.5 (0.0 HOURS/DAY:

DAYS/WEEK:

1.0 1-0 DAYS/WEEK:

WEEKS/YEAR:

52 ! WEEKS/SEASON:

HOURS/YEAR:

334 Iog HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.2880 M.I RATE/HR:

pui. 1- -flTrAYmJU Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MIUSSIONS REPORT -2011 Page: 5 Date: 11-29-2011 182 0AAA-Exelon Generation Co LLC-FURL COMBUSTION DATA -)OINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/IODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 NH3 NOX PART PM10 PM2 .5 S02 VOM 3 3 3 3 3 3 3 3 3 3 0 3 3 3 3 3 3 3.85 22600 3.2.0697 O.p(0q1.0573 0.05-73.0573 0.051q.002.09 o. Oi EMISSION FACTOR IEPA REPORTED 32.26 6102.258 121.3 2.65 2.54 2.39 10.71 2.65 33.67 6508.8.23 126.75 2.76 2.27 2.27.08 3.56 0. 038 2 qq 0 -0 3.o9&POLLUTANT CODE METHOD IEPA REP OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED WPTURING CONTROLS: ALPTURING STACKS: STACK STACK STACK 0001 0002 0003 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

16.70 %16.70 %16.70 t STACK 0004 CAPTURE EFFICIENCY:

16.70 w 6:port: APCA0530 Illinois Environmental Protection Agency Page: Division of Air Pollution Control Date: DAPC -ANNUAL EDISSIONS REPORT -2011 6 11-29-2011 1820AAA -Rxelon Generation Co LLC-FUEL COMBUSTION DATA -)OINT 0001-6 LARGE DIESEL GENERATORS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 20100102 09 / 1978/IODE 01 -APTURING STACKS: STACK 0023 STACK 0024 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

16.60 16.60 Ir porz: ApAUZOOL Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 7 Date: 11-29-2011-Exelon Generation Co LLC-FUEL COMBUSTION DATA -OOINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978/[ODE 01)ESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 59.00 MAR -MAY: 41.00 'A.i SEP -NOV: 0.00 0.00 % 0 BEGAN OPERATION:

09 / 1978*EASED OPERATION:

/UEL TYPE: 21 NPUT (MMBTU/HR):

DISTILLATE OIL #2 93 HEAT CONTENT: 139000 Btu/gal SULFUR CONTENT (l) 0.05 ASH CONTENT (l): NITROGEN CONTENT (b): UNITS: 1000 GALLONS BURNED 131.447 0.- 00Z2.UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

1.9 0 HOURS/DAY:

DAYS/WEEK:

1.0 1.0 DAYS/WEEK:

WEEKS/YEAR:

4 q.0 WEEKS/SEASON:

HOURS/YEAR:

8 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.0640 M2 _ _ _RATE/HR:

port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUUAL EMISSIONS REPORT -2011 Page: Date: 8 11-29-2011 1820AAA -Exelon Generation Co LLC-FUEL COMBUSTION DATA -'OINT 0002-2 AUXILIARY BOILERS PERMIT: 78090018 SCC: 10100501 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/lODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED---- ----- -----------------------------------

EMISSION RATE (LB/HR)IEPA REPORTED--- ------------------CO C02 METHANE N20 NH3 NOX PART PM10 PM2.5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 0 0 0 3 3 3 3 3 3 3 22300.28.11.8 o.1 20 0 2 1 1.25.28.252 O.____.06 8028.1.03.288.23.023.023.0155.453.0023.299 1427.2.018.007.048 1.195.119.06.015.017.015 0.5 0.0r)3 0.007 o.o04 1.07 0. 005 0.017 0. oeL POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED-------------------

APTURING CONTROLS: APTURING STACKS: OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED 50.00 %STACK 0005 CAPTURE EFFICIENCY:

STACK 0006 CAPTURE EFFICIENCY:

50.00 V port: A#%Avq9$O Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 9 11-29-2011 1820AAA -Exelan Generation Co, LLC-FUEL COMBUSTION DATA -OINT 0013 SMALL DIESEL ENGINES BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 20200101 09 / 1978/[ODE 01)ESCRIPTION CORRECTION:

I BEGAN OPERATION:

'EASED OPERATION:

UEL TYPE: 21 NPUT (MMBTU/HR)

PERCENT THROUGHPUTS:

DISTILLATE OIL #2 4.1 DEC -FEB: JUN -AUG: 36.72 %_23. MAR -MAY: 27.65 %t_2 5SEP -NOV: 14.51

  • 0.67 21.12 *35..54 HEAT CONTENT: 139000 Btu/gal 137.l47 SULFUR CONTENT (t): 0.05 0.00,2 ASH CONTENT (%);NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

0.9 0.75 HOURS/DAY:

DAYS/WEEK:

1.0 DAYS/WEEK:

WEEKS/YEAR:

52 WEEKS/SEASON:

HOURS/YEAR:

45 HOURS/SEASON:

START TIME: END TIME: RATE/H.: 0.0132 .RATE/H:

Page: 10 port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 10 Date: 11-29-2011 1820AAA -Exelon Generation Co LLC-FUEL COMBUSTION DATA --SMALL DIESEL ENGINES PERMIT: 78090018'OINT 0013 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/SCC: 20200101 IODE 01 -POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED-----------------------------------------------

EMISSION RATE (LB/HR)IEPA REPORTED--- ------------------CO C02 NH3 NOX PART PM10 PM2 .5 S02 VOM 3 3 3 3 3 3 3 3 3 3 0 3 3 3 3 3 3 3 21800.95 n.95.8 0,9 4.41 _ _.q/.31 0.,3_.31 _ --_1.31 0.5I.29 C.. 2 9.36 C. -?(3.99 632.2.01 18.39.52.52.52 1.19 1.49 1.74 287.76.01 8.06.57.57.57.53.66 D. 0.70 _POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED-------------------

APTURING CONTROLS: APTURING STACKS: OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED--- ------------------STACK 0020 CAPTURE EFFICIENCY:

100.00 %

purc: #wCJ9w3V Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 11 Date: 11-29-2011 1820AAA -Exloln Generation Co LLC-PROCESS DATA -)OINT 0007-RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/IODE 01)ESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 %._D_. MAR -MAY: 25.00 BEGAN OPERATION:

/ JUN -AUG: 25.00 %__ SEP -NOV: 25.00'EASED OPERATION:

/UNITS: TONS BURNED UNITS: TONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

0.0 0 HOURS/DAY:

DAYS/WEEK:

0.0 0 DAYS/WEEK:

WEEKS/YEAR:

0 WEEKS/SEASON:

HOURS/YEAR:

0 0 HOURS/SEASON:

START TIME: PWR (LB/HR): END TIME: RATE/HR: 0.0000 0 PWR (LB/HR): RATE/HR:

port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 12 11-29-2011
1820AAA -Exelon Generation Co LLC-PROCESS DATA -POINT 0007-RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 I 1982/%4ODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO NOX S02 VOM 3 3 3 3 3 3 3 3.98.131.0004.0062 0 0 0 0 0 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CONTROL 0003 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Pu~rr- AJ'IVJLAODU Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MISSIONS REPORT -2011 Page: Date: 13 11-29-2011 1820AAA -Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/TANK TYPE: ABOVEGROUND CAPACITY DIAMETER (FT): HEIGHT (FT): LENGTH (FT): VAPOR SPACE (FT): LOCATION:

ABOVEGROUND SEAL TYPE: DOUBLE SUPPORT TYPE: CONCRETE 2500 gal TEMPERATURE (F): 10.0 ROOF COLOR: 10 SHELL COLOR: ROOF PAINT CONDITION:

1.5 SHELL

PAINT CONDITION:

70 WHITE WHITE GOOD GOOD-THROUGHPUTS MATERIAL MWT VP (psia)n l d d............................

--.. ......Unle-aded G asoline e. 11A---- ---- --- THROUGHPUTS

DENSITY ANNUAL (gallons)

PEAK OZONE (gallons).................................................

port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 14 Date: 11-29-2011 1820A&A -Exelon Generation Cc LLC-STORAGE TANK DATA -POINT 0012 MODE 01-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 IDESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: 26.10 %,15,0 MAR -MAY: 35.80 % _8.p BEGAN OPERATION:

12 / 1998 JUN -AUG: 20.90 %o.( SEP -NOV: 17.20 %2.9 CEASED OPERATION:

/UNITS: 1000 GALLONS THROUGHPUT UNITS: 1000 GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 H4.U0 ROS/DAY: DAYS/WEEK:

7.0 D7A0 DYS/WEEK: WEEKS/YEAR:

52 -O WEEKS/SEASON:

HOURS/YEAR:

8,760 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.0015 0. 00 RATE/HR:

port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 15 Date: 11-29-2011 i182OAA& -Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012 MODE 01 POLLUTANT CODE-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED VOM 3 3.46.02 0.0142 POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED CAPTURING CONTROLS: OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CONTROL 0005 CAPTURING STACKS: CAPTURE EFFICIENCY:

100.00 %

port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 16 11-29-2011 1820AAA -Exelon Generation Co LLC-OTHER SOURCE DATA -POINT 0014 2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 % MAR -MAY: 25.00 BEGAN OPERATION:

09 / 1977 JUN -AUG: 25.00 %[SEP -NOV: 25.00 %_.5 CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 a24. 0 HOURS/DAY:

DAYS/WEEK:

7.0 7.0 DAYS/WEEK:

WEEKS/YEAR:

52 WEEKS/SEASON:

HOURS/YEAR:

8,760 9 .. HOURS/SEASON:

START TIME: END TIME: RATE/HR: 84.0000 RATE/HR:

port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 17 Date: 11-29-2011 1I20AAA -Exelon Generation Co LLC-OTHER SOURCE DATA -POINT 0014-2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM10 PM2.5 3 3 3 3 3 3 8.38 8.38 5.2 4.43 14.59 4.43 q.5q POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0021 CAPTURE EFFICIENCY:

100.00 %

!port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL DMISSIONS REPORT -2011 Page: 18 Date: 11-29-2011 1820AAA -Exelon Generation Co LLC-OTHER SOURCE DATA -POINT 0015 8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978 MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 %_, _5. MAR -MAY: 25.00 %.BEGAN OPERATION:

/ JUN -AUG: 25.00 %_;.._SEP

-NOV: 25.00 %_, CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 H, o HOURS/DAY:_

DAYS/WEEK:

7.0 27, .DAYS/WEEK:

WEEKS/YEAR:

52 5" WEEKS/SEASON:

HOURS/YEAR:

8,760 H7& HOURS/SEASON:

START TIME/: END TIME : RATE/HR: 2.6400 ."/RATE/HR:

poet:. AICA053 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 11-29-2011 1820AAA -Exelon Generation Co LLC-OTHER SOURCE DATA -POINT 0015-8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 3B500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM10 PM2.5 3, 3 3 3 ____3 ___3.526.526.17.14.14.14 0.14 0. 14 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0022 CAPTURE EFFICIENCY:

100.00 %

Dort; APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL AMIBBIONS REPORT -2011 Page: 20 Date: 11-29-2011 L820AAA -Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0001 Venturi scrubber PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 /1982 CONTROL CODE: 129 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED 99.800 3 CAPTURING CONTROLS: CONTROL 0004 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

port: AFCA0530 linois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL DMSSIONS REPORT -2011 Page: Date: 21 11-29-2011 1820AAA-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0002 -HEPA FILTER PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 101 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY POLLUTANT ANNUAL OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PART PM10 99.000 3 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0007 CAPTURE EFFICIENCY:

100.00 %

tport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 22 11-29-2011

,1920AAA -Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0003 -GAS SOLID SEPARATOR PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 059 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY I I POLLUTANT ANNUAL OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED PART CAPTURING CONTROLS: 99.990 99. 90 _______ 3 CONTROL 0001 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

port: aVCA*w Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MISSIONS REPORT -2011 Page: 23 Date: 11-29-2011 L820A"J-zxelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0004 -ACTIVATED CHARCOAL PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 048 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY POLLUTANT ANNUAL OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED VOM 98.000 3 CAPTURING CONTROLS: CONTROL 0002 CAPTURE EFFICIENCY:

100.00 __CAPTURING STACKS:

port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2 Page: 24 Date: 11-29-2011 O11 1820AAA -Ezelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0005 -Vapor recovery system PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/CONTROL CODE: 110 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY I POLLUTANT ANNUAL OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED VOM 99.000 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0019 CAPTURE EFFICIENCY:

100.00 %

RPCWL; ArvlSu+/-iiinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: Date: 25 11-29-2011 L820AAA -Exelon Generation Cc LLC STACK 0001-STACK DATA -HEIGHT (FT)DIAMETER (FT)1A DIESEL GENERATOR 2.90 FLOW RATE (ACFM)TEMPERATURE (F)133 21296 950 0002 -1B DIESEL GENERATOR 2.90 0003 -2A DIESEL GENERATOR 2.90 133 21296 950 133 21296 950 0004-2B DIESEL GENERATOR 2.90 0005 -Ul AUXILIARY BOILER 3.70 0006 -U2 AUXILIARY BOILER 3.70 133 140 140 21296 34468 950 515 515 34468 0007 0019 0020-RADWASTE VOLUME REDUCTION 2.70 57 11537 728-GASOLINE STORAGE AND HANDLING POINT 00012 0.20 14-SMALL ENGINES TYPICAL 2.50 29 2 70 16397 368 port: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2011 Page: 26 Date: 11-29-2011 1820AAK -Exelon Generation Co LLC-STACK DATA -STACK DIAMETER (FT)HEIGHT (FT)FLOW RATE (ACFMW TEMPERATURE (F)0021 -COOLING TOWER NATURAL DRAFT 14.90 57 361801 76 0022 -COOLING TOWERS, 8 INDUCED DRAFT 14.20 30 282068 85 0023 -lB AUXILIARY DIESEL FEEDWATER PUMP 0.83 103 2800 612 0024 -2B AUXILIARY DIESEL FEEDWATER PUMP 0.83 103 2800 612 Exelon.Exeon Generation Company, LLC www.exeloncorp.cor, Nuclear Byron Station 4450 North German Church Road Byron, (L 61010-9794 April 14, 2011 LTR: BYRON 2011-0057 File: 2.09.0810 1.10.0101 Illinois Environmental Protection Agency Bureau of Air Air Quality Planning Section (#39)1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Attn: Annual Emission Report

Subject:

2010 Annual Emission Report In accordance with the requirements of 35 Illinois Administrative Code Part 254, "Environmental Protection

-Annual Emissions Reporting Rule," Exelon Generation Company hereby submits the 2010 Annual Emissions Report for Byron Station, ID No. 141820AAA.

Included in the Annual Emissions Report are the following:

1. Annual Source Emission Summary 2. Annual Source Emissions Forms If you have any questions regarding this matter, please contact Ms. Zoe Cox, Environmental Specialist, at (815) 406-3035.Respectfully, Bradle J. Adams Plant Manager Byron Nuclear Generating Station BJNZC/ca Attachment bcc: Kevin Hersey -Environmental

-Cantera Zoe Cox -Chemistry

-Byron Station bcc: Kevin Hersey -Environmental

-Cantera Zoe Cox -Chemistry

-Byron Station BYRON GENERATING STATION 2010 Annual Emissions Inventory Report Su.nina of Points, Controls & Stacks Point S Point Description ControlS Control Description Stack 4 EMISONS TONWYEAR CO NOX__ PART Pa0 1 Pki.5 S02 yOU N13 w01 Large Diesel EngAnes N/A N/A )D1O to 0004, 0023, 0024 5.62 i 21.16 i0.46 0.38 0.38 0.01 1 0.60 0.04 2 Boilers N/A NA 0006 and 0006 0.00 0,01 0.00 0.00 0.00 0100 0.00 0.00 0007 _Pad Waste Volume Reducion Syste 0001 Ventur Scnjbber /WA 0 0 F 0 0 0 0 0 N/A 0002 HEPA Filter 0007 0 0 0 0 0 0 0 NWA 0003 Gas Solid Separator N/A 0 0 0 0 0 0 0 NWA 0004 Acivated Charcoal WA 0 0 0 0 0 0 I 0 N/A 0012 Gasoline Storage and Handing 0006 Vapor Control System 0019 NA N/A N/A NIA N/A NWA 009 NiA 0013 Small Diesel Engines N/A N/A 0020 0.04 0.18 0.01 0.01 0.01 0.01 0.02 0.00 0014 Cowing Tower-Natural Draft N/A N/A 0021 N/A N A 19.40 19.40 19.40 N/A MIA N/A 0014 Cooiing Tower-induced Dralf N/A I/A 0022 WA NA 0.63 0.63 0.63 WA N/A WA Sr 1 0 Total 5.66 : 21.35 20.50 20.42 20.42 0.02 0.71 T 0.04 Source 2010 Fuel Consumption

________ ___________

______________

____ __S 1000/Gal __ ___Bollars 0.5 _Large Diesel There were no exceedences of any annual permit requirements during the calendar year 2010 addressed in this report.E n g i n e s 9 6 .1 _____Engines 0.60 ___ i '

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 1 11-16-2010 141820AAA

-Exelon Generation Co LLC-SOURCE DATA -AIRS: 17-141-0069 IEPA USE ONLY SIC 1: 4911 NAICS 1: 221113 FINDS: ILD984889907 IEPA USE ONLY SIC 2: NAICS 2: 3OURCE FEIN: 360938600 SIC 3: NAICS 3: IDS AND D&B: 000-692-9509 SIC 4: NAICS 4:ýOCATION LATITUDE:

42:04:26.9400 SIC 5: NAICS 5: LONGITUDE:

89:16:58.0800 SIC 6: NAICS 6: Exelon Generation Co LLC CONTACT: Zoe Cox PHONE: 815-406-3035 EXT:;OURCE FAX: 815-406-3301)DDRESS 4450 N German Church Rd E-MAIL: Byron, IL 61010 UNNUAL Exelon -Byron Generating Station CONTACT: Zoe Cox ,MISSION PHONE: 815-406-3035 EXT:.EPORT FAX: 815-406-3301 1AILING 4450 N German Church Rd E-MAIL: LDDRESS Byron, IL 61010 Any person who knowingly makes a false, fictitious, or fraudulent material statement, orally or in writing, to the Illinois EPA commits a Class 4 felony. A second or subsequent offense after conviction is a Class 3 felony. (415 ILCS 5/44(h))I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted.

Based on my inquiry of the person or persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate and complete.ATO ED SIGNATURE DATE The Illinois EPA is authorized to require, and you must disclose, the information on this form pursuant to 35 Ill. Adm.Code 201.302(a, b) and 254. It is not necessary to use this form in providing the information.

Failure to disclose the information may result in penalties as provided for in the Environmental Protection Act, 415 ILCS 5/24-45.

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 2 11-16-2010 L41820AAA

-Exelon Generation Co LLC POLLUTAN4T CODE CO CO2 METHANE N20 NH3 NOX PART PMi6 PM2.5 S02 VOM SOURCES REPORTED EMISSIONS FOR 2010 (TONS/YEAR)

-ANNUAL SOURCE EMISSIONS

-ALLOWABLE EMISSIONS (TONS/YEAR) 25.362960 39,591.686400 0.436800 0.131040 1.438080 94.975356 41.662992 41.058192 25.479384 10.126704 5.035766 EMISSIONS REPORTED FOR 2009 (TONS/YEAR) 6.500000 1,257.110000 0.000000 0 .000000 0.040000 24.510000 20.920000 20.830000 20.830000 0.040000 0.720000 IEPA 2010 ESTIMATED EMISSIONS (TONS/YEAR)

...........

6.798947 2,963.898270 0.022680 0.006804 0.113630 22.883387 39.403404 39.382812 23.907786 2.109559 2.512579 o l. 3AQo, 5-0 at). L4.)0c. `q Report: APCA0530 Illinois Environmental Protection Agency Page: 3 Division of Air Pollution Control Date: 11-16-2010 DAPC -ANNUAL EMISSIONS REPORT -2010 141820AAA

-Exelon Generation Co LLC-PERMIT LISTING -)ERMI T flJMBER TYPE OF PERMIT OPERATION NAME------------------------------------------------------

STATUS STATUS DATE EXPIRES 78090019 FESOP BYRON GENERATING STATION GRANTED 12-13-2002 12-13-2007 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: 4 Date: 11-16-2010 L41820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 000i-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 21 DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 34.62 %2__ MAR -MAY: 16.08 ___._ SEP -NOV: 23. 40 % RO.C_25.90 -QQ.33 BEGAN OPERATION:

09 / 1978 CEASED OPERATION:

/FUEL TYPE: 21 INPUT- IMNBTU/HR)

DISTILLATE OIL #2 232.8 HEAT CONTENT: 139000 Btu/gal l374,19O SULFUR CONTENT (%): 0.05 ASH CONTENT (V): NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

7.1 HOURS/DAY:

DAYS/WEEK:

1.0 0 , DAYS/WEEK:

WEEKS/YEAR:

52 51 WEEKS/SEASON:

HOURS/YEAR:

371 3 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.2960 0"2 _ RATE/HR:_

leport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2C Page: 5 Date: 11-16-2010 10 L41820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 NH3 NOX PART PM10 PM2. 5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22600.85 3.2 1.0697 Q -Q 0 q 7.0573 Q. 052 L1.0573 Is 05 5.002 00I.09 0.__ _32.26 6102.258 121.3 2.65 2.54 2.39 10.71 2.65 34.61 6689.6.237 130.29 2.84 2.33 2.33.08 3.66 3 1.i61 Q~. 07 3.5(p POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX 3 VOM 3:APTURING CONTROLS: 1APTURING STACKS: 3.2.09 130.29 3.66 STACK 0001 CAPTURE EFFICIENCY:

16.70 %ST.ACK 0002 CAPTURE EFFICIENCY:

16.70 %_

Zeport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 6 11-16-2010 L41820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 09 / 1978 SCC:/78090018 20100102 MODE 01 -CAPTURING STACKS: STACK 0003 STACK 0004 STACK 0023 STACK 0024 CAPTURE CAPTURE CAPTURE CAPTURE EFFICIENCY:

EFFICIENCY:

EFFICIENCY:

EFFICIENCY:

16.70 16.70 16.60 16.60 Zeport:. APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -20 Page: 7 Date: 11-16-2010 210.41820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978/MODE 01'DESCRIPTION CORRECTION:

I BEGAN OPERATION:

CEASED OPERATION:

FUEL TYPE: 21 INPUT (MMBTU/HR):

PERCENT THROUGHPUTS:

09 / 1978 DISTILLATE OIL #2 93 DEC -FEB: JUN -AUG: 20.90 __-._ MAR -MAY: 33.50 qI. O SEP- NOV: 17.30 % 0 28.30 % 0 HEAT CONTENT: 139000 Btu/gal !5"/(29 SULFUR CONTENT (%): 0.05 ASH CONTENT (%): NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

1.3 HOURS/DAY:

DAYS/WEEK:

1.0 1, DAYS/WEEK:

WEEKS/YEAR:

5 q,o WEEKS/SEASON:

HOURS/YEAR:

7 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.0600 O. 64 RATE/HR:

Ieport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 8 11-16-2010

.41820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002-2 AUXILIARY BOILERS PERMIT: 78090018 SCC: 10100501 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978 MODE 01 POLLUTANT CODE CO C02 METHANE N20 NH3 NOX PART PM1 0 PM2.5 S02 VOM POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22300.28.11.8 M, 20 AD 2 1 _ _ _.25.28.252 ..06 8028.1.03.288.23.023.023.0155.453.0023.299 1338.017.007.048 1.194.119.06.015.017.015 0, 04 ?0.109). 01S 0.01ot5-METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX 3 VOM 3 APTURING 20NTROLS: APTURINO RTACKS: 20 1.194.015.252 ieport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: 9 Date: 11-16-2010 L41820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978 MODE 01 CAPTURING STACKS: STACK 0005 STACK 0006 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

50.00 50.00 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 10 11-16-2010 L41820AAA-Exelon Generation Co LLC-FUEL COMdBUSTION DATA -POINT 0013 SMALL DIESEL ENGINES BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 20200101 09 / 1978/MODE 01 DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 26.27 %3j.l MAR -MAY: 24.70 %.9_1SEP -NOV: 22.71 w 14_5!26.32 % o1.Io2 BEGAN OPERATION:

CEASED OPERATION:

//FUEL TYPE: 21 DISTILLATE OIL #2 INPUT (MMBTU/HR):

4.1 UNITS

1000 GALLONS BURNED HEAT CONTENT: 139000 Btu/gal 137,(09c)SULFUR CONTENT (): 0. 05 O. Ot)O, ASH CONTENT (%)M: NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

1.3 HOURS/DAY:

DAYS/WEEK:

1.0 1,0 DAYS/WEEK:

WEEKS/,YEAR:

52 52WEEKS/SEASON:

________HOURS./YEAR:

69 ---54 HOURS/SEASON:

START TIME: END TIME:.RATE/HR : 0.0153 .C0 015d- RATE/HER:

I~eport: APCA0530 Illinois Environmental Protection Agency Page: 11 Division of Air Pollution Control Date: 11-16-2010 DAPC -ANNUAL EMISSIONS REPORT -2010.41820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0013 SMALL DIESEL ENGINES BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 20200101 09 / 1978 MODE 0i POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 NH3 NOX PART PM10 PM2. 5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 21800.95 __._q.8 0.9 4.41 L4.41.31 ).31.31 o.31.31 r). 31.29 _ ._ _ _.36 Q Se 3.99 632.2.01 18.39.52.52.52 1.19 1.49 2 333.54.01 9.28.65.65.65.61.76 0.01 0-.57 0.5--3 0. &P(O POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED----------.-.-- --------.-- -.-- --------------------------OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX 3 VOM 3'APTURING CONTROLS: 'APTURING STACKS: STACK 0020 4.41.36 9.28 76 CAPTURE EFFICIENCY:

100.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 12 11-16-2010 L41820AAA

-Exelon Generation Co LLC-PROCESS DATA -POINT 0007-RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 %_QMAR -MAY: 25.00 BEGAN GPERATION:

/ JUN -AUG: 25.00 % 0 SEP -NOV: 25.00 %__0 CEASED OPERATION:

/UNITS: TONS BURNED UNITS: TONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

0.0 HOURS/DAY:

DAYS/WEEK:

0.0 DAYS/WEEK:

WEEKS/YEAR:

0 WEEKS/SEASON:

HOURS/YEAR:

0 HOURS/SEASON:

START TIME: PWR 0.0000 0END TIME: RATE/HR: 0.0000 0 PWR (LB/HR)_RATE/HR:

leport: APCAO530 Illinois Environmental Protection Agency Page: 13 Division of Air Pollution Control Date: 11-16-2010 DAPC -ANNUAL EMISSIONS REPORT -2010 L41820AAA

-Exelon Generation Co LLC-PROCESS DATA -POINT 0007 RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO NOX S02 VOM POLLUTANT CODE 3 3 3 3 3 3 3 3.98.131.0004.0062 0 0 0 0 0 0 METHOD EMISSION FACTOR IEPA REP IEPA REPORTED-------------. -.--------------------------------OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX VOM 3 3 0 0 CAPTURING CONTROLS: CONTROL 0003 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 14 11-16-2010 141820AAA

-Exelon Generation Co LLC-PROCESS DATA -POINT 0014 2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978 MODE )1 DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: 25.00 MAR -MAY: 25.00 BEGAN OPERATION:

09 / 1977 JUN -AUG: 25.00 %_25_ SEP -NOV: 25.00 %_a CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 04. HOURS/DAY:

DAYS'WEEK:

7.0 C) DAYS/WEEK:

WEEKS/YEAR:

52 WEEKS/SEASON:

HOURS/YEAR:

8,760 5THOURS/SEASON:

START TIME: PWR LB!'HR): END TIME: RATE/HR: 84.0000 PWR (LB/HR): RATE/HR:_

Report: APCA050 Illinois Environmental Protection Agency Page: 15 Division of Air Pollution Control Date: 11-16-2010 DAPC -ANNUAL MdISSIONS REPORT -2010 L41820AAA

-Exelon Generation Co LLC-PROCESS DATA -POINT 0014-2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978 MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM10 PM2. 5 3 3 3 3 3 3 8.38 8.38 5.2 4.51 4.51 4.51 14-143 14-4~3 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0021 CAPTURE EFFICIENCY:

100.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 16 11-16-2010 14182OA.AA

-Exelozn Generation Co LLC PROCESS DATA -POINT 0015 8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE OL DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 MAR -MAY: 25.00 BEGAN OPERATION:

/ JUN -AUG: 25.00 % SEP -NOV: 25.00 CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 HOURS/DAY:

DAYS/WEEK:

7.0 -E L. DAYS/WEEK:

WEEKS/YEAR:

52 WEEKS/SEASON:

HOURS/YEAR:

8,760 HOURS/SEASON:

START TIME: PWR ýLB,'HR):

END TIME: RATE/BR: 2.6400 PWR (LB/HR): RATE/HR:

Zeport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page; 17 Date: 11-16-2010 L41820AAA

-Excelon Generation Co LLC-PROCESS DATA POINT 0015 8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM10 PM2. 5 3 3 3 3 3 3.526.526.17.14 .4.14 o,14.14 D. 14 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED------------.-- -.-- -------------------------OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0022 CAPTURE EFFICIENCY:

100.00 %

ýeport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 18 11-16-2010

.41820AAA

-Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/TANK TYPE: ABOVEGROUND CAPACITY DIAMIETER (FT): HEIGHT (FT): LENGTH (FT): VAPOR SPACE (FT): LOCATION:

ABOVEGROUND SEAL TYPE: DOUBLE SUPPORT TYPE: CONCRETE 2500 gal TEMPERATURE (F): 10.0 ROOF COLOR: 10 SHELL COLOR: ROOF PAINT CONDITION:

1.5 SHELL

PAINT CONDITION:

70 WHITE WHITE GOOD GOOD THROUGHPUTS VP MATERIAL MWT (psia).....[ ................................---- ---- --- THROUGHPUTS

DENSITY ANNUAL(gallons)

PEAK OZONE(gallons)

ý.Lfa ~ 13, 401;?

leport: APCA0530 Illinois Environmental Protection Agency Page: 19 Division of Air Pollution Control Date: 11-16-2010 DAPC -ANNUAL EMISSIONS REPORT -2010.41820AAA

-Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012 MODE 01-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: 22.80 / MAR -MAY: 31.80 %BEGA14 OPERATION:

12 / 1998 JUN -AUG: 23.40 %,& SEP -NOV: 22.00 % 17.2 CEASED OPERATION:

/UNITS: 1000 GALLONS THROUGHPUT UNITS: 1000 GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 c2-4' HOURS/DAY:

DAYS/WEEK:

7.0 ' DAYS/WEEK:

WEEKS/YEAR:

52 5a WEEKS/SEASON:

HOURS/YEAR:

8,760 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.0014 RATE/HR:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 20 11-16-2010 141820AAA

-Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012 MODE 01-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED VOM POLLUTANT CODE 3 3.46.18 0.METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED VOM 3.18 CAPTURING CONTROLS: CONTROL 0005 CAPTURE EFFICIENCY:

100.00 %_CAPTURING STACKS:

Zeport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 21 11-16-2010 L41820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTRCL 0001 -VENTURI SCRUBBER PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 129 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY

..E.......RE...ORTED....

IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED S02 99.800______ 3 CAPTURING CONTROLS: CONTROL 0004 CAPTURE EFFICIENCY:

100.00 t CAPTURING STACKS:

Report: APCA0530 Illinois .,vironmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL WMISSIONS REPORT -2010 Page: Date: 22 11-16-2010 141820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0002 -HEPA FILTER PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982 CONTROL CODE: 127 DESCRIPTION CORRECTION:

m I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT PART EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED 99.000 3 PM10 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0007 CAPTURE EFFICIENCY:

100.00 %

leporr: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: 23 Date: 11-16-2010

.41820AAA-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0003 -GAS SOLID SEPARATOR PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982 CONTROL CODE: 059 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY

............

EPORTED.....

IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED PART 99.990 3 CAPTURING CONTROLS: CONTROL 0001 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 24 11-16-2010 141820AAA-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0004 -ACTIVATED CHARCOAL PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 048 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY

...............

O...TED..IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY

.............

PORTED.....

IEPA REPORTED OPERATION METHOD IEPA REPORTED VOM 98.000 3 CAPTURING CONTROLS: CONTROL 0002 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Zeport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 25 11-16-2010

.41820AAA-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0005 -VAPOR RECOVERY SYSTEM PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:.

12 / 1998/CONTROL CODE: 110 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY I ANNUAL OPERATION POLLUTANT EFFICIENCY

...............

OR....E..IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED VOM 99.000 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0019 CAPTURE EFFICIENCY:

100.00 w Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 26 11-16-2010 141820AAA

-Exelon Generation Co LLC-STACK DATA -STACK DIAMETER (FT) HEIGHT (FT)0001 -1A DIESEL GENERATOR 2.90 133 0002 -1B DIESEL GENERATOR 2.90 133 0003 -2A DIESEL GENERATOR 2.90 133 0004 -2B DIESEL GENERATOR 2.90 133 0005 -U1 AUXILIARY BOILER 3.70 140 0006 -U2 AUXILIARY BOILER 3.70 140 0007 -RADWASTE VOLUME REDUCTION 2.70 57 0019 GASOLINE STORAGE AND HANDLING POINT 00012 0.20 14 0020 SMALL ENGINES TYPICAL 2.50 29 FLOW RATE (ACFM)21296 21296 21296 21296 34468 34468 11537 TEMPERATURE (F)950------------

950 950 950 515 515 728 70 2 16397 368 eport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 27 11-16-2010 41820AAA-Exelon Generation Co LLC-STACK DATA -STACK DIAMETER (FT) HEIGHT (FT)0021 COOLING TOWER NATURAL DRAFT 14.90 57 0022 COOLING TOWERS, 8 INDUCED DRAFT 14.20 30 0023 -1B AUXILIARY DIESEL FEEDWATER PUMP 0.83 103 0024 2B AUXILIARY DIESEL FEEDWATER PUMP 0.83 103 FLOW RATE (ACFM).......................

TEMPERATURE (F)361801 76 282068 85 2800 612 2800 612 Report; APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2010 Page: Date: 28 11-16-2010 141820AAA

-Exelon Generation Co LLC JOQ{ Exelnt.Exelon Generation Company, LLC www.exeloncorp.com NucleaT Byron Station 4450 North German Church Road Byron, IL 61010-9794 April 24, 2010 LTR: BYRON 2010-0033 File: 2.09.0810 1.10.0101 Illinois Environmental Protection Agency Bureau of Air Air Quality Planning Section (#39)1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Attn: Annual Emission Report

Subject:

2009 Annual Emission Report In accordance with the requirements of 35 Illinois Administrative Code Part 254, "Environmental Protection

-Annual Emissions Reporting Rule," Exelon Generation Company hereby submits the 2009 Annual Emissions Report for Byron Station, ID No. 141820AAA.

Included in the Annual Emissions Report are the following:

1. Annual Source Emission Summary 2. Annual Source Emissions Forms If you have any questions regarding this matter, please contact Mr. Stan Kerr, Chemistry manager, at (815) 406-3200.Respectfully, Bradley .Adams Plant Manager Byron Nuclear Generating Station BJA/ZC/sdk Attachment bcc: Kevin Hersey -Environmental

-Cantera Zoe Cox -Chemistry

-Byron Station Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 1 11-20-2009 141820AAA

-Exelon Generation Co LLC-SOUECE DATA -SOURCE IDS AND LOCATION SOURCE ADDRESS ANNUAL EMISSION REPORT MAILING ADDRESS AIRS: 17-141-0069 IEPA USE ONLY SIC 1: 4911 NAICS I: 221113 FINDS: ILD984889907 IEPA USE ONLY SIC 2: NAICS 2: FEIN: 360938600 SIC 3: NAICS 3: D&B: 000-692-9509 SIC 4: NAICS 4: LATITUDE:

42:04:26.940l SIC 5: NAICS 5: LONGITUDE:

89:16:58.0800 SIC 6: NAICS 6: Exelon Generation Co LLC 4450 N German Church Rd Byron, IL 61010 CONTACT: Zoe Cox PHONE: 815-406-3035 EXT: FAX: 815-406-3301 EMAIL: Exelon -Byron Generating Station 4450 N German Church Rd Byron, IL 61010 CONTACT: Zoe Cox PHONE: 815-406-3035 EXT: FAX: 815-406-3301 E-MAIL: B -4 I certify under penalty of law that this document and all attachments were prepared under my direction or supervision In accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted.

Based on my inquiry of the person or persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, ac6urate and complete.T E AUTHOPITZED SIGNATURE TYPED OR PRINTED NAME AND TITLE DATE*If. -- -4 TELEPHONE NUMBER leport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 2 Date: 11-20-2009 141820AAA-Exelon Generation Co LLC POLLUTANT CODE CO C02 METHANE N20 NH3 NOX PART PM10 PM2.5 S02 VOM SOURCES REPORTED EMISSIONS FOR 2009 (TONS/YEAR)

ANNUAL SOURCE EMISSIONS

-ALLOWABLE EMISSIONS (TONS/YEAR) 25.362960 39,591.686400 0.436800 0.131040 1.438080 94.975356 41.662992 41.058192 25.479384 10.126704 5.035766 EMISSIONS REPORTED FOR 2008 (TONS/YEAR) 4.980000 965.200000 0.000000 0.000000 0.030000 18.830000 20.390000 20.320000 20.320000 0.050000 0.630000 IEPA 2009 ESTIMATED EMISSIONS (TONS/YEAR) 6.798947 2,963.898270 0.022680 0.006804 0.113630 22.883387 39.403404 39.382812 23.907786 2.109559 2.512579 a -oL4-S~D. Ta Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 3 11-20-2009 141820AAA

-Exelon Generation Co LLC-PERMIT LISTING -PERMIT NUMBER 78090018 TYPE OF PERMIT FESOP OPERATION NAME BYRON GENERATING STATION STATUS STATUS DATE GRANTED 12-13-2002 EXPIRES 12-13-2007 l.eport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 4 11-20-2009 14182 OAAA -Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

BEGAN OPERATION:

09 I 1978 CEASED OPERATION:

/FUEL TYPE: 21 DISTILLATE OIL #2 INPUT (MMBTU/HR):

232.8 UNITS: 1000 GALLONS BURNED DEC -FEB: JUN -AUG: 25.08 %QLD.tMAR

-MAY: 21.79 % UP.OS SEP -NOV: 33.81 %,3.0O 19.32 % HEAT CONTENT: 139000 Btu/gal 131,00 SULFUR CONTENT (4): 0.05 O.00z ASH CONTENT (%): NITROGEN CONTENT (%)M: UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

5.2 T7 I HOURS/DAY:

DAYS/WEEK:

5.0 1. 0 DAYS/WEEK:

WEEKS/YEAR:

12 5 .WEEKS/SEASON:

HOURS/YEAR:

312 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.2670 :" toq( RATE/HR:

Reporc: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNIUAL EMISSIONS RNPORT -2009 Page: Date: 5 11-20-2009 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE MLB/HR)IEPA REPORTED CO C02 NH3 NOX PART PM1 0 PM2. 5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22600 0.09O~32.26 6102.258 121.3 2.65 2.54 2.39 10.71 2.65 31.18 3L4-.(p1 6034.2.21 117.37 130. gq 2.56 _Q. _ 4 2.1 Q.33 2.1 a.-33.07 0.01 3.3 3- (,(-POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED 16.70 %_________

16.70 %16.70 %STACK STACK STACK 0001 0002 0003 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

STACK 0004 CAPTURE EFFICIENCY:

16.70 k Report: APCAOS30 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 6 Date: 11-20-2009 141820AAA-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 -CAPTURING STACKS: STACK C STACK C)023 p024 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

16.60 16.60 Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 1 11-20-2009 141820AAA-Rxelou Qeneration Co LLC-FURL COMBUSTION DATA -POINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978/MODE 01 IDESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 18.00 *7.1 MAR -MAY: 31.40 -.35.5- SEP -NOV-I 10.30 % C17.40.30 *A'BEGAN OPERATION:

09 / 1978 CEASED OPERATION:

/FUEL TYPE: 21 INPUT (MMBTU/HR):

DISTILLATE OIL #2 93 HEAT CONTENT: 139000 Btu/gal 13"71 (PO0 SULFUR CONTENT (%,): 0.05 ASH CONTENT- (%): NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

2.0 1. 39 HOURS/DAY:

DAYS/WEEK:

2.0 1. D DAYS/WEEK:

WEEKS/YEAR:

3 ,I WEEKS/SEASON:

HOURS/YEAR:

10 -10,/ HOURS/SEASON:

START TIME: END TIME: ATE/H. o~o0.0580 0,0(40ATE/H:

Report; APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 8 Date: 11-20-2009 141820AAA-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978 MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 METHANE N20 NH3 NOX PART PM410 PM2.5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22300.28.11-5 0 i .l t'.06 8028.03.288.23.023.023.0155.453.0023.3 O. Qqq 1293.4.016.0064.048 1.198.12.06.015.017.015 L,0qg p*o,-cg IQq. I 0. 0ý" POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE.SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0005 CAPTURE EFFICIENCY:

50.00 %_STACK 0006 CAPTURE EFFICIENCY:

50.00 w Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 9 11-20-2009 141820A~AA

-Exelon Genieration Co LLC-FUEL~ COMBUSTION DATA -POINT 0013 -SMALL DIESEL ENGINES PERMIT: 78090018 SCC: 20200101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

I BEGAN OPERATION:

CEASED OPERATION:

FUEL TYPE: 21 INPUT (MMBTU/HR):

PERCENT THROUGHPUTS:

DISTILLATE OIL #2 4.1 DEC -FEB: JUN -AUG: 53.20 %2I. IMAR -MAY: 20.70 %i;a _OSEP -NOV: 13.60 aa.'1 12.o 50 00, .2 HEAT CONTENT: 139000 Btu/gal SULFUR CONTENT (t): 0. 05 ASH CONTENT (%: _NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED* ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

2.0 HOURS/DAY:

DAYS/WEEK:

4.0 DAYS/WEEK:

WEEKS/YEAR:

15 .2- WEEKS/SEASON:

.HOURS/YEAR:

120 LO! HOURS/ SASON : START TIME: END TIME:0.0133 ,0'5 RATE/NR:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 10 11-20-2009 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0013 SMALL DIESEL ENGINES BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 20200101 09 / 1978/MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 NH3 NOX PART PM1 0 PM2 .5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 21800 0.951 o. S1t 0. ;t9 3.99 632.2.01 18.39.52.52.52 1.19 1.49 1.79 289.94.01 8.3.58.58.58.55.68 ,,O.(Of 01700_0.01-0. ros 0. oG5 0. -7&3 3 3 3 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0020 CAPTURE EFFICIENCY:

100.00 %

Report: APCA053D Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 11 11-20-2009 141820AAA.

-ib~elaox Generation Cc LLC-PROCESS DATA -POINT 0007-RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 -.O MAR -MAY: 25.00 %BEGAN OPERATION:

/ JUN -AUG: 25.00 % SEP -NOV: 25.00 %CEASED OPERATION:

/UNITS: TONS BURNED UNITS: TONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

0.0 or HOURS/DAY:

DAYS/WEEK:

0.0 er DAYS/WEEK:

WEEKS/YEAR:

0 WEEKS/SEASON:

HOURS/YEAR:

0 HOURS/SEASON:

START TIME: PWR (LB/HR): 0.0000 END TIME: RATE/HR: 0.0000 '01WRA (LB/_/HR):_

RATE/HR: ________

leport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 12 Date: 11-20-2009 L41820AAA

-Exelon Generationt Co LWC PROCESS DATA -POINT 0007 RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO NOX S02 VOM 3 3.98 3 3 3 3 3 3 METHOD EMISSION FACTOR IEPA REP IEPA REPORTED.131.0004.0062 0 0 0 0 POLLUTANT CODE OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CONTROL 0003 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMSSIONS REPORT -2009 Page: Date: 13 11-20-2009 141820AAA

-Exelon Geiieration Cc LLC-PROCESS DATA -POINT 0014-2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 % -0 MAR -MAY: 25.00 ___.O BEGAN OPERATION:

09 / 1977 JUN -AUG: 25.00 %.45_0 SEP -NOV: 25.00 '.O CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 ,L4.0 HOURS/DAY:

DAYS/WEEK:

7.0 DAYS/WEEK:

WEEKS/YEAR:

52 WEEKS/SEASON:

HOURS/YEAR: , 6760 HOURS/SEASON:

START TIME: PWR (LB/HR): END TIME;RATEIHR: 84.0000 f4.0 PWR (LB/HR): RATE/-R:

ýqport:. APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page Date: 14 11-20-2009 1.41820AAA

-Rxelon Generation Co LLC-PROCESS DATA POINT 0014-2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM10 PM2. 5 3 3 3 3 3 3 8.38 8.38 5.2 4.41 4.41 4.41 14. s, POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0021 CAPTURE EFFICIENCY:

100.00 %

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -WUAL DISSIONS REPORT -2009 Page: 15 Date: 11-20-2009 141820AAA

-Uxelon Genearation Co LLC-PROCESS DATA -POINT 0015 -8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FES: 25.00 5.0 AR -MAY: 25.00 %BEGAN OPERATION:

/ JUN -AUG: 25.00 1;950 SEP -NOV: 25.00 %CEASED OPERATION:

-UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 04 HOURS/DAY:

DAYS/WEEK:

7.0 ".0 DAYS/WEEK:

WEEKS/YEAR:

52 WEEKS/SEASON:

HOURS/YEAR:

8,760 0&0 HOURS/SEASON:

START TIME: PWR (LB/HR): END TIME: RATE/HR: 2.6400 PWR (LB/HR): RATE/HR:

rePort: APCAO530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 16 11-20-2009 L41920AAA

-Exelon Generation Co LLC-PROCESS DATA -POINT 0015-8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE PART PM10 PM2.5 POLLUTANT CODE METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED 3 3 3 3 3 3.526.526.17.14.14.14 p.14 METHOD EMISSION FACTOR IEPA REP IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0022 CAPTURE EFFICIENCY:

100.00 w Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MISSIONS REPORT -2009 Page: 17 Date: 11-20-2009 141a20AAA

-Exolon Generation Co LLC-STORAGE TANX DATA -POINT 0012-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/TANK TYPE: ABC CAPACITY DIAMETER (FT): HEIGHT (FT): LENGTH (FT) : VAPOR SPACE (FT):)VEGROUND 2500 gal 10.0 10 1.5 TEMPERATURE (F): ROOF COLOR: SHELL COLOR: ROOF PAINT CONDITION:

SHELL PAINT CONDITION:

70 WHITE WHITE GOOD GOOD LOCATION:

ABOVEGROUND SEAL TYPE: DOUBLE SUPPORT TYPE: CONCRETE THROUGHPUTS MATER IAL I4WT MATERIL MWT (psia)Lntwecdd czasolhv,~

(0.qoý-------------

T14ROUGHPUTS

DENSITY ANNUAL(gallons)

PEAK OZONE(gallons)

Report:. APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 18 11-20-2009 1414U2OAAA

-Exelon Generation Co LLC-STORAGE TANK DATA -POINT 0012-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 MODE 01 DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 22.90 %Alf MAR -MAY: 24.80 %kA.4 SEP -NOV: 33.00 ,31.1 19.30 % a-70 BEGAN OPERATION:

12 / 1998 CEASED OPERATION:

/UNITS: 1000 GALLONS THROUGHPUT UNITS: 1000 GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 0 HOURS/DAY:

DAYS/WEEK:

7.0 7. DAYS/WEEK:

WEEKS/YEAR:

52 WEEKS/SEASON:

HOURS/YEAR:

8,760 HOURS/SEASON:_

START TIME: END TIME: RATE/HR: 0.0012 O.C)Qo 4 RATE/HR:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 19 Date: 11-20-2009 141820AAA-Exelon, Generation Co LLC-STORAGE TANK DATA -POINT 0012 MODE 01 POLLUTANT CODE VOM-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE CLB/HR)IEPA REPORTED 3 3.46.016 o-0I'POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED CAPTURING CONTROLS: OZONE SEASON EMISSION RATE (LB/HR)IEPA, REPORTED 100.00 %CONTROL 0005 CAPTURING STACKS: CAPTURE EFFICIENCY:

leport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: Date: 20 11-20-2009 141820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0001 -VENTURI SCRUBBER PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

i1 / 1982/CONTROL CODE: 129 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY I I I ANNUAL OPERATION POLLUTANT EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED S02 99.800 3 CAPTURING CONTROLS: CONTROL 0004 CAPTURE EFFICIENCY:

100.00 t CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 21 Date: 11-20-2009 141820AAA

-Exelom Geaeratiozi Co LLC-CONTROL DEVICE DATA -CONTROL 0002 -HEPA FILTER PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 127 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT PART EFFICIENCY ZEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED 99.000 3 PM10 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0007 CAPTURE EFFICIENCY:

100.00 %

Zeport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 22 Date: 11-20-2009 I'41820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0003 -GAS SOLID SEPARATOR PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 059 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY I ANNUAL OPERATION POLLUTANT PART EFFICIENCY

..........

RE...OR....ED.

IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED 99.990_____ 3 CAPTURING CONTROLS: CONTROL 0001 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL UfISSIONS REPORT -2009 Page: 23 Date: 11-20-2009 141820A&A-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0004 -ACTIVATED CHARCOAL PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 048 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY

..........

R..PO....T....

IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON EFFICIENCY

..........

RE.......TE...

IEPA REPORTED OPERATION METHOD IEPA REPORTED VOM 98.000 3 CAPTURING CONTROLS: CONTROL 0002 CAPTURE EFFICIENCY:

100.00 ?CAPTURING STACKS:

Zeport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 24 Date: 11-20-2009 L41820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA °CONTROL 0005 -VAPOR RECOVERY SYSTEM PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/CONTROL CODE: 110 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY-I POLLUTANT ANNUAL OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED PEAK OZONE SEASON EFFICIENCY IEPA REPORTED OPERATION METHOD IEPA REPORTED VOM 99.000 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0019 CAPTURE EFFICIENCY:

100.00 t Report: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control-AMIML EMISSIONS REPORT -2009 Page: 25 Date: 11-20-2009 141820AA -3xlorn Generation Co LLC-STACK DATA -HEIGHT (FT)STACK 0001 DIAMETER (FT)-1A DIESEL GENERATOR 2.90 FLOW RATE (ACFM)-----6-----------------

21296 TEMPERATURE (F)950 133 0002 -1B DIESEL GENERATOR 2.90 0003 -2A DIESEL GENERATOR 2.90 0004 -2B DIESEL GENERATOR 2.90 0005 -U1 AUXILIARY BOILER 3.70 0006 -U2 AUXILIARY BOILER 3.70 133 21296 ________950 133 21296 950 133 21296 950 140 34468 515 140 34468 515 0007 RADWASTE VOLUME REDUCTION 2.70 57 11537 ______ __2 728 0019 -GASOLINE STORAGE AND HANDLING POINT 00012 0.20 14 0020 -SMALL ENGINES TYPICAL 2.50 29 70 16397 368 leport: APCA0530 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2009 Page: 26 Date: 11-20-2009 14020AAA -Exelon Generation Co LLC-STACK DATA -STACK DIAMETER (FT)HEIGHT (FT)FLOW RATE (ACFM).. 6. 80.................

361801 TEMPERATURE (F)0021 COOLING TOWER NATURAL DRAFT 14.90 57 76 0022 -COOLING TOWERS, 8 INDUCED DRAFT 14.20 30 282068 85 0023 18 AUXILIARY DIESEL FEEDWATER PUMP 0.83 103 2800 612 0024 -2B AUXILIARY DIESEL FEEDWATER PUMP*0.83 103 2800 612

-Mode SM _____ pm pvM Or BL *M Bupno pULM jii sossern OnGJL VIN W/N VIN em90 z90 rwo YIN YN amN viIN 4wc Puvti00b~)

K YIN WIN YiN *LOIt 'l61t #L-st YIN YIN taWO YIN YN 4wUo Iu~npw-li eWroo 140O YIN zWV YIN YIN YIN YIN YIN VIN sL ZA WO AItH oogu~i wo, zwoo YIN 0 0 0 a 0 -0 0 YIN ivOMMOmiv PO000P "M_______YIN 0 0 000 0 0 YIN J05MI SWpso-t cm YIN 0 0 0 0 0 0 0 I=_ semi if8d~I4 awO___YIN 0 0 0 0 0 0 0 VIM_ YiNUD P0W MAIA 1000 Ua iPjq l GuiflOA OuM M £000 00*0 000 W.V 000 WD 0010 w.v 000 9000 Phug 9=10 YIN VR4 S56P00 Mi mm lt00 19*0 WO .VT st'90 OtO- Paoo Tzoo *w010 m00 to YIN YIN 5SmU I 1 Wmir tooo ktHN YSOA a0m SIM 01Vd LM~d XOW a*_____________~~~~~-dp-pm-0NO 0NeSW _______ .wsp* woup~smaRld e uItod____ I~ ~~ I SPMM __ __ __ __ __ P_ _ __ _ _ _____t-ded AE-uimftUM3 RP mime puWWec

Exelk nsm Exelon Generation Company, LLC www.exeloncorp.com NuClear Byron Station 4450 North German Church Road Byron, IL 61010-9794 April 24, 2009 LTR: BYRON 2009-0053 File: 2.09.0810 1.10.0101 Illinois Environmental Protection Agency Bureau of Air Air Quality Planning Section (#39)1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Attn: Annual Emission Report

Subject:

2008 Annual Emission Report In accordance with the requirements of 35 Illinois Administrative Code Part 254, "Environmental Protection

-Annual Emissions Reporting Rule," Exelon Generation Company hereby submits the 2008 Annual Emissions Report for Byron Station, ID No. 141820AAA.

Included in the Annual Emissions Report are the following:

1. Annual Source Emission Summary 2. Annual Source Emissions Forms If you have any questions regarding this matter, please contact Mr. Stan Kerr, Chemistry manager, at (815) 406-3200.Respectfully, BradleiJ.

Adams Plant Manager Byron Nuclear Generating Station BJA/ZC/sdk Attachment, bcc: Kevin Hersey -Environmental

-Cantera Zoe Cox -Chemistry

-Byron Station Big AI"BI'BhB%nngk Aftmýl EMW=Inft hýýof P t Control sucks POW 0 PWnt Comm

  • n Slack* EMSOS TONS, EA_CO NOX PART PMh 0 PA.S S02 VOM N00 0001 L are Engines WA WA 001 tO 0004.00023.00 4.87 1M33 0.40 0.33 0.33 0.01 0.52 0.03 0002 2 _aileism WA NIA 0005 and 000 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0007 d was,,, Vlu,, R-dum., SYSn 0001 Ventun Scruber -NA 0 0 0 0 0 0 0 MA_ _ _0002 .EPA Fiter 0007 0 0 0 0 0 0 0 NIA 0003 Gas ._.__ 0003. WA 0 0 0 0 0 0 0.0 MA 0004 Adva.edChercW WA 0o 0 a 0 0 0 MA 0012 Qocage nd H ing 0005 Va, Control Vislen 0019 WA WA NWA NWA PGA WA 0.07 N/A 0013 Smith Diesel Engines WA WA 0020 0.11 O.50 0.04 0.04 0.04 0.03 0.04 0.00 0014 Coding Tower.,Na.al Dratt WA IWA 0021 MA WA 19.35 19.35 19.35 AA 'A NA 0014 Draft WA NIA 0022 WA WA 0.60 0.60 0.60 NiA WA ,WA source 2M0 Fuel CTao 4M 1&M 20.3 2 2 I 0..3___en 0.5 __ _.___ _ __ _ _ _There were no excwedences of any anual permit requiremenrt during the calendar year 2008 addressed In this report.83.J Ungh 1I teport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control Page: Date: 01 11-14-2008 DAPC -AIUL EMISSIONS REPORT -2008 L41l2OAAA

-Zxelon Generation Co LLC-SOURCE DATA -:OURCE:DS AND.OCATION 3OURCE kDDRESS NNUAL SPORT 1AILING DDRESS AIRS: 17-141-0069 IEPA USE ONLY SIC 1: 4911 NAICS 1: 221113 FINDS: ILD984889907 IEPA USE ONLY SIC 2: NAICS 2: FEIN: 360938600 SIC 3: NAICS 3: D&B: 000-692-9509 SIC 4: NAICS 4: LATITUDE:

42:04:26.9400 SIC 5: NAICS 5: LONGITUDE:

89:16:58.0800 SIC 6: NAICS 6: Exelon Generation Co LLC 4450 N German Church Rd Byron, IL 61010 CONTACT: Zoe Cox PHONE: 815-406-3035 EXT: FAX: 815-406-3301 E-Mail: Z(. eCO) (£4. no.r C Exelon -Byron Generating Station 4450 N German Church Rd Byron, IL 61010 CONTACT: Zoe Cox PHONE: 815-406-3035 EXT: FAX: 815-406-3301 E-MAIL: 7ZQ, C))((r2 ~IoCcr I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted.

Based on my inquiry of the person or persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate and complete.*

  • P m i AUTORIZED S~fMi.TR 3Iý44xey 7 4( ' -2y 1 4 YA64,,45 DATE TYPED OR PRINTED NAME AND TITLE TELEPHONE NUMBER eport: APCA0531 Illinois Environmental Protection k.ency Division of Air Pollution Control Page: 02 Date: 11-14-2008 DAPC -AUNUIL EMISSIONS RBPORT -2008*41820AAA

-Exelon Generation Co LLC-ANNhUAL SOURCE EMSSIONS -POLLUTANT CODE CO C02 METHANE N20 NH3 NOX PART PM10 PM2.5 S02 VOM SOURCES REPORTED EMISSIONS FOR 2008 (TONS/YEAR)

n, ps, C', 0ý3 ALLOWABLE EMISSIONS (TONS/YEAR) 25.362960 39,591.686400 0.436800 0.131040 1.438080 94.975356 41.662992 41.058192 25.479384 10.126704 5.035766 EMISSIONS REPORTED FOR 2007 (TONS/YEAR) 6.700000 2,963.898270 0.022680 0.006804 0.080000 25.330000 25.750000 25.600000 25.560000 0.290000 0.780000 IEPA 2008 ESTIMATED EMISSIONS (TONS/YEAR) 6.798947 2,963.898270 0.022680 0.006804 0.113630 22.883387 39.403404 39.382812 23.907786 2.109559 2.512579 teport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL RKISSIONS REPORT -2008 Page: 03 Date: 11-14-2008 L41820AAA

-ERcelon GenerationL Co LLC-PERMIT LISTING -PERMIT NUMBER 78090018 TYPE OF PERMIT OPERATION NAME FESOP BYRON GENERATING STATION STATUS GRANTED STATUS DATE 12-13-2002 EXPIRES 12-13-2007 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNA IMDSSIONS REPORT -2008 Page: Date: 04 11-14-2008 14182OAhA

-Exelon Generation Cc LLW-FUEL COMBUSTION DATA -POINT 0001 -6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/140DE 01 DESCRIPTION CORRECTION:

B I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 19.83 %'.__ MAR -MAY: 25.29 t_2.11 SEP -NOV: 30.43 %_33 91-24.45%BEGAN OPERATION:

09 / 1978 CEASED OPERATION:

/FUEL TYPE: 21 INPUT (MMBTU/HR):

DISTILLATE OIL #2 232.8 HEAT CONTENT: 139000 Btu/gal 1 31 L481 SULFUR CONTENT (9k) :. 0 .0.05 ASH CONTENT (%): NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

5.2 HOURS/DAY:_______

DAYS/WEEK:

6.0 DAYS/WEEK:

WEEKS/YEAR:

12 WEEKS/SEASON:

HOURS/YEAR-371 HOURS/SEASON:

START TIME: END TIME: RATE/HRI 0.2870 0, VO7 RATE/NT : CONFIDENTIAL:

N CONFIDENTIAL:________

teport: ALPCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -RRPORT -2008 Page: Date: as 11-14-2008 14182OAAA

-Exelon Generation Cc LLC-FURL 0ONMU5TZON DATA -POINT 0001-6 LARGE DIESEL GENERATORS PERMIT: 78090018 SCC: 20100102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED Co C02 NHI3 NOX PART P1410 P142.5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22600.85 22600.8 3.2.0697.0573.0573.0182 0.0. 0010.09 32.26 6102.258 121.3 2.65 2.54 2.39 10.71 2.65 34.52 6102.23 c,-e'129.94 -?'-. '7 2.83 5(p_2.33 10IO 2.33 , iC'.74 3.65 5.30 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/9R)IEPA REPORTED NOX 3 VOM 3 CAPTURING CONTROLS: CAPTURING STACKS: 3 3 121.3 2.65 121.3 2.65 STACK 0001 CAPTURE EFFICIENCY:

CAPTURE EFFICIENCY:

16.70 %16.70 %STACK 0002

,leport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2008 Page: 06 Date: 11-14-2008 141620AAA

-Exalon Generation Cc LLW-FUEL COMBUSTION DATA -POINT 0001-6 LARGE DIESEL GENERATORS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 09 / 1978 SCC: 20100102/MODE 01 CAPTURING STACKS: STACK 0003 STACK 0004 STACK 0023 STACK 0024 CAPTURE CAPTURE CAPTURE CAPTURE EFFICIENCY:

EFFICIENCY:

EFFICIENCY:

EFFICIENCY:

16.70 16.70 16.60 16.60~6 8 8 teport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EwISSIONS REPORT -2008 Page: Date: 07 11-14-2008 L41820AA, -Exelon Generation Co LLC-FU11L COMBUSTIONI DATA -POINT 0002-2 AUXILIARY BOILERS PERMIT: 78090018 SCC: 10100501 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 IDESCRIPTION CORRECTION:

I!PERCENT THROUGHPUTS:

BEGAN OPERATION:

09 / 1978 CEASED OPERATION:

/FUEL TYPE: 21 DISTILLATE OIL #2 INPUT (MMBTU/HR):

93 UNITS: 1000 GALLONS BURNED DEC -FEB: JUN -AUG: 0.10 !)g.C MAR -MAY: 0.60 %3.4 SEP -NOV: 99.30 4 %,5 HEAT CONTENT: 139000 Btu/gal 131 491 SULFUR CONTENT (%): 0.05 ASH CONTENT (0);NITROGEN CONTENT (%): UNITS: 1000 GALLONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

10.1 HOURS/DAY:

DAYS/WEEK:

7.0 -- -DAYS/WEEK:

WEEKS/YEAR:

6 , ,5 .WEEKS/SEASON:

HOURS/YEAR:

427 HOURS/SEASON:

START TIME: END TIME: RATE/HR: 0.2520 0, O5J RATE/HR: CONFIDENTIAL:

N CONFIDENTIAL:

teport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2008 Page: 08 Date: 11-14-2008 L41620AAA

-Exelon Generation Cc LLC-FURL COMBUSTION DATA -POINT 0002-2 AUXILIARY BOILERS PERMIT: 78090018 SCC: 10100501 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978 I MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 METHANE N20 NH3 NOX PART PM 10 PM2.5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22300.28.11 5 22300.28.ii.8 __ _ _ _ _ _20 2 1.25 5.68 0,.252.06 8028.1.03.288.23.023.023.0155.453.0023 1.26 3.C00 8028.1.03.202 c_0_ O__5.04 k 9qg.504 _ ._,_ _.252 02 00.063 0.015.644 .._, _ _ _.064 _ _ _ _ _ _POLLUTANT METHOD CODE IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX 3 VOM 3 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0005 3 ___3.23.0023.23.0023 CAPTURE EFFICIENCY:

50.00 %

Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANUAL RMSSIONS REPORT -2008 Page: Date: 09 11-14-2008 141820AhA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0002 2 AUXILIARY BOILERS BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 SCC: 10100501 09 / 1978/MODE 01 CAPTURING STACKS: STACK 0006 CAPTURE EFFICIENCY:

50.00 %

Report: APCAO531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUIIAL WSSIONS REPORT -2008 Page: Date: 010 11-14-2008 141820ARA

-Rxelon Generat~ion Co LLC-PURL, COMBUSTION DATA -POINT 0013-SMALL DIESEL ENGINES PERMIT: 78090018 SCC: 20200101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 21.98 %50'.2MAR

-MAY: 26.98 W SEP -NOV: 21.10 23.94

  • a-BEGAN OPERATION:

CEASED OPERATION:

FUEL TYPE: 21 INPUT (MMBTU/HR):

DISTILLATE OIL #2 4.1 HEAT CONTENT: 139000 Btu/gal SULFUR CONTENT (t): 0.05 ASH CONTENT (M): NITROGEN CONTENT (1)d: UNITS: 1000 GALLONS BURNED 13' 74 0. 00a UNITS: 1000 GALLONS BURNED V ANNUAL OPERATION PEAK OZONE SEASON OPERATION ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

1.0 HOURS/DAY:

DAYS/WEEK:

4.0 D4 D nAYS/WEEK:

WEEKS/YEAR:

12 __5______

WEEKS/SEASON:_______

HOURS/YEAR:

49 HOURS/SEASON:

START TIME: END TIME: RATE/HE: 0.0121 0 D, RATE/HR: CONFIDENTIAL:

N CONFIDENTIAL:

Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNOAL EMSSIONS REPORT -2008 Page: 011 Date: 11-14-2008 141820AAA

-Exelon Generation Co LLC-FUEL COMBUSTION DATA -POINT 0013-SMALL DIESEL ENGINES PERMIT: 78090018 SCC: 20200101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO C02 NH3 NOX PART PM10 PM2.5 S02 VOM 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 21800.95 21800.8 4.41.31.31.31.29.36 3.99 632.2.01 18.39.52.52.52 1.19 1.49 1.62 ___7_632.2.01 0, O1 7.51 1930)* .S3 ,5.53 _ _ _.53 __._S_9.49 0.S5.61 O, -_o_POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX 3 VOM 3 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0020 3 3 18.39 1.49 18.39 1.49 CAPTURE EFFICIENCY:

100.00 w Report: APCAOS31 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL DIUSSIONS REPORT -2009 Page: Date: 012 11-14-2008 141820OAAA

-Exelon Generation Co LLC-PROCESS DATA -POINT 0007 RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: 25.00 % MAR -MAY: 25.00 BEGAN OPERATION:

/ JUN -AUG: 25.00

  • 1 SEP -NOV: 25.00 %CEASED OPERATION:

/UNITS: TONS BURNED UNITS: TONS BURNED ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

0.0 HOURS/DAY:

DAYS/WEEK:

0.0 DAYS/WEEK:

WEEKS/YEAR:

0 WEEKS/SEASON:

HOURS/YEAR:

0 HOURS/SEASON:

START TIME: PWR (LB/HR) : 0.0000 END TIME: RATE/HR: 0.0000 e PWR (LB/HR): RATE/HR: CONFIDENTIAL:

N CONFIDENTIAL:

Report: Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANMUAL MCUSSIONS RXPORT -2008 Page: 013 Date: 11-14-2008 141820AAA

-Exelon Generation Co, LLC-PROCESS DATA -POINT 0007-RAD WASTE VOLUME REDUCTION SYSTEM PERMIT: 78090018 SCC: 50300599 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED CO NOX S02 VOM 3 3 3 3 3 3 3.98.131.0004.0062 0 0 0 0.,01 POLLUTANT METHOD CODE IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED NOX VOM 3 3 3 3.131.0062.131.0062 CAPTURING CONTROLS: CONTROL 0003 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

teport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -AMNUAL 96SSION8 REPORT -2006 Page: Date: 014 11-14-2008 L41820AAA

-Exelon Generation Co LLC-PROCRSS DATA -POINT 0014 2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 I DESCRIPTION CORRECTION:

I PERCENT THROUGHPUTS:

DEC -FEB: 25.00 t MAR -MAY: 25.00 %Q5 BEGAN OPERATION:

09 / 1977 JUN -AUG: 25.00 % SEP -NOv: 25.00 %CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 HOURS/DAY:

DAYS/WEEK:

7.0 r7 DAYS/WEEK:

WEEKS/YEAR:

52 WEKS/SEASON:_

HOURS/YEAR:

8,760 HOURS/SEASON:

START TIME: PWR (LB/HR) : END TIME: RATE/HR: 84.0000 PWR (LB/ER): CONFIDENTIAL:

N _ __/HR_: CONFIDENTIAL:

teport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANN=LMISSIONS REPORT -2008 Page: Date: 015 11-14-2008 L41820AAA

-Exelon Generation Co LLC-PROCESS EWA! -POINT 0014-2 NATURAL DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500102 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM10 PM2.5 3 3 3 3 3 3 8.38 8.38 5.2 5.58 Lq I 5.58 L.q 5.58 'jL4 I POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0021 CAPTURE EFFICIENCY:

100.00 Ir Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MrSSI0NS REPORT -2008 Page: Date: 016 11-14-2008 14120AAA -Exolon Generation Co LLC-PROCESS DATA -POINT 0015-8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/DESCRIPTION CORRECTION:

PERCENT THROUGHPUTS:

DEC -FEB: V__ MAR -MAY: BEGAN OPERATION:

/ JUN -AUG: % SEP -NOV: CEASED OPERATION:

/UNITS: MILLION GALLONS THROUGHPUT UNITS: MILLION GALLONS THROUGHPUT ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

HOURS/DAY:

DAYS/WEEK:

DAYS/WEEK:

WEEKS/YEAR WEEKS/SEASON:

HOURS/YEAR.

HOURS/SEASON:

START TIME;PWR (LB/HR): END TIME: RATE/HR: : f PWR (LB/HR): CONFIDENTIAL:

RATE/HR: CONFIDENTIAL:

Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2008 Page: Date: 017 11-14-2008 141820AM -Exelon Generation Co LLW-PROCESS D&TA -POINT 0015-8 INDUCED DRAFT COOLING TOWERS PERMIT: 78090018 SCC: 38500101 BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/MODE 01 POLLUTANT CODE METHOD IEPA REP EMISSION FACTOR IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED PART PM410 PM2.5 POLLUTANT CODE 3 3 3.526.526.17 QJiL DJ~METHOD IEPA REP EMISSION FACTOR IEPA REPORTED OZONE SEASON EMISSION RATE (LB/HR)IEPA REPORTED CAPTURING CONTROLS: CAPTURING STACKS: STACK 0022 CAPTURE EFFICIENCY:

100.00 lk Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MaSSIONS REPORT -2008 Page: 018 Date: 11-14-2008 141820AAA

-Zxelon, Generation Co LLC-STORAGE TANK DATA -POINT 0012-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998 I TANK TYPE: ABOVEGROUND CAPACITY DIAMETER (FT): HEIGHT (FT): LENGTH (FT): VAPOR SPACE (FT)-: 2500 gal 10.0 TEMPERATURE (F): ROOF COLOR: SHELL COLOR: 70 ________10 WHITE WHITE GOOD GOOD ROOF PAINT CONDITION:

1.5 SHELL

PAINT CONDITION:

LOCATION:

ABOVEGROUND SEAL TYPE: SUPPORT TYPE: DOUBLE-CONCRETE MATERIAL MWT VP (psia)--------------

THROUGHPUTS-------------

DENSITY ANNUAL(gallons)

PEAK OZONE(gallons)

LUr leaded- GaObAiri 4,qc)-- --o- -- ----9-- ---- --- --

Leport; APCAOS31 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MaISBION8 REPORT -2008 Page: 019 Date: 11-14-2008 L41820AAA

-Uxolon Generation Co LLC-STORAA3Z TAMK DATA -POINT 0012 NODE 01-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 DESCRIPTION CORRECTION-I PERCENT THROUGHPUTS:

DEC -FEB: JUN -AUG: 22.00 V199 MAR -MAY: 25.40 0,241, SEP -NOV: 31.40 % 33,0 21.20 t I Cq, BEGAN OPERATION:

12 / 1998 CEASED OPERATION:

/UNITS: 1000 GALLONS STORAJGE CAPACITY UNITS: 1000 GALLONS STORAGE CAPACITY ANNUAL OPERATION PEAK OZONE SEASON OPERATION HOURS/DAY:

24.0 R4 HOURS/DAY:

DAYS/WEEK:

7.0 .. DAYS/WEEK:

WEEKS/YEAR:

52 67RWEEKS!

SEASON!: ______HOURS/YEAR:

8,760 HOURS/SEASON:

START TIME: END TIME: RATE/-R: 0.0013 OD 1 2 RATE/:H_CONFIDENTIAL:

N CONFIDENTIAL:

Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL DUSSIONS REPORT -2008 Page: 020 Date: 11-14-2008 141820AAA

-Rxelon Generation Co LLC-STORRGE TANK DATA -POINT 0012 MODE 01 POLLUTANT CODE-GASOLINE STORAGE AND HANDLING PERMIT: 78090018 SCC: 40301019 METHOD EMISSION FACTOR IEPA REP IEPA REPORTED EMISSION RATE (LB/HR)IEPA REPORTED VOM 3 3.46.o017 .IL POLLUTANT METHOD EMISSION FACTOR CODE IEPA REP IEPA REPORTED---------------

VOM 3 3 CAPTURING CONTROLS: CONTROL 0005 CAPTURE EFFICIENCY:

CAPTURING STACKS: OZONE SEASON EMISSION RATE (LB/HRa IEPA REPORTED.46.46 100.00 4 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control Page: 021 Date: 11-14-2008 DAPC -ANNUAL EKZSSIONS RUPORT -2008 141820AAA

-Exelon Generation Co LWC-CONTROL DMCX~ DATA -CONTROL 0001 VENTURI SCRUBBER PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 053 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED S02 99.800 3 CAPTURING CONTROLS: CONTROL 0004 CAPTURE EFFICIENCY:

100.00 f CAPTURING STACKS:

Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -AN [, MKrSSION8 REPORT -2008 Page: 022 Date: 11-14-2008 141920AAA

-Ezelon (ieneration Co LLC-CONTROL DEVICE DATA -CONTROL 0002 -EPA FILTER BEGAN OPERATION:

CEASED OPERATION:

PERMIT: 78090018 11 / 1982/CONTROL CODE: 017 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY POLLUTANT PART PM10 CAPTURING CONTROLS: CAPTURING STACKS: STACK 001 ANNUAL OPERATION EFFICIENCY METHOD IRPA REPORTED IEPA REPORTED 99.000 3 PEAK OZONE SEASON OPERATION EFFICIENCY METHOD ISPA REPORTED IEPA REPORTED 07 CAPTURE EFFICIENCY:

100.00 t Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MISSIONS REPORT -2009 Page: 023 Date: 11-14-2008 141820AAA

-Exelon Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0003 -GAS SOLID SEPARATOR PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 059 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT PART EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED 99.990 3 CAPTURING CONTROLS: CONTROL 0001 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Report: APCAOS31 Illinois Environmental Protection Agency Division of Air Pollution Control Page: 024 Date: 11-14-2008 DAPC -ANNUAL EMSSZONS REPORT 2008 141820AAA

-Exelon. Generation Co LLC-CONTROL DEVICE DATA -CONTROL 0004 -ACTIVATED CHARCOAL PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/CONTROL CODE: 048 DESCRIPTION CORRECTION:

I REMOVAL EFFICIENCY POLLUTANT ANNUAL OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED VOM 98.000:3 CAPTURING CONTROLS: CONTROL 0002 CAPTURE EFFICIENCY:

100.00 %CAPTURING STACKS:

Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control Page: 025 Date: 11-14-2008 DAPC -ANNUAL EMSSIO3IS REPORT -2008 141820AAk Exelon Generation Co LLC-CONTROL DEVICE D&T& -CONTROL 0005 -VAPOR RECOVERY SYSTEM PERMIT: 78090018 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/CONTROL CODE: 047 DESCRIPTION CORRECTION:

REMOVAL EFFICIENCY ANNUAL OPERATION POLLUTANT EFFICIENCY IEPA REPORTED METHOD IEPA REPORTED PEAK OZONE SEASON OPERATION EFFICIENCY METHOD IEPA REPORTED IEPA REPORTED VOM 99.000 CAPTURING CONTROLS: CAPTURING STACKS: STACK 0019 CAPTURE EFFICIENCY:

100.00 %

Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL REPORT -2008 Page: 026 Date: 11-14-2008 141820AAA

-Exelon Generation Co LLC-STACK DATA -STACK 0001 -IA DIESEL GENERATOR BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/I DESCRIPTION CORRECTION:

I DIAMETER (FT) : HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F): IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM: SCALE METHOD: ACCURACY WHERE MEASURED : Center Of Facility 2.90 133 21296 REPORTED -950 REPORTED -42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCAOS31 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MISSIONS REPORT -2008 Page: 027 Date: 11-14-2008 141820AAA

-Exelon Generation Cc LLC-STACK DATA -STACK 0002 -1B DIESEL GENERATOR BEGAN OPERATION:

CEASED OPERATION:

09 / 1976/IDESCRIPTION CORRECTION:

DIAMETER (FT): HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F): 2.90 133 21296 REPORTED -950 REPORTED -IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM: SCALE : METHOD: ACCURACY WHERE MEASURED : Center Of Facility 42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2008 Page: 028 Date: 11-14-2008 141820AAK

-Exelon Generation Cc LLW-STACK DATA -STACK 0003 -2A DIESEL GENERATOR BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/DESCRIPTION CORRECTION:

I DIAMETER (FT): HEIGHT (FT):/FLOW RATE (ACFM): TEMPERATURE (F) : 2.90 133 21296 REPORTED -950 REPORTED -IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM: SCALE METHOD: ACCURACY WHERE MEASURED :Center Of Facility 42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control-ANNUAL DUSSIONS RBPORT -2008 Page: Date: 029 11-14-2008 141820AAk

-Exelon Generation Co LLC-STACK DATA -STACK 0004 -2B DIESEL GENERATOR BEGAN OPERATION:

CEASED OPERATION:

09 / 1978 I.: DESCRIPTION CORRECTION:

DIAMETER (FT): HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F)-: IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MN:SS.SSSS):

DATUM SCALE METHOD: ACCURACY WHERE MEASURED :Center Of Facility 2.90 133 21296 REPORTED -950 REPORTED -42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -AWWP. MaSSIONS REPORT -2008 Page: Date: 030 11-14-2008 141820A&A

-Exelon Generation Co LLC-STACK DATA -STACK 0005 -Ul AUXILIARY BOILER-BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/DESCRIPTION CORRECTION:

I DIAMETER (FT): HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F) : 3.70 140 34468 REPORTED -515 REPORTED -IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS)

LONGITUDE (DD:MM:SS.SSSS):

DATUM SCALE METHOD: ACCURACY WHERE MEASURED :Center Of Facility 42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 i.eport: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control Page: 031 Date: 11-14-2008 DAPC -ANNUAL =fXSSXONS REPORT -2008 L41820AAA

-E2xelon Generation Cc LLC-STACK DATA -STACK 0006 -U2 AUXILIARY BOILER BEGAN OPERATION:

CEASED OPERATION:

09 / 1978/.DESCRIPTION CORRECTION:

I DIAMETER (FT) : HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F) : IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM: SCALE METHOD: ACCURACY WHERE MEASURED :Center Of Facility 3.70 140 34468 REPORTED -515 REPORTED -42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMUSSIONS REPORT -2008 Page: 032 Date: 11-14-2008 141820AAk

-Exelon Generation Cc I.LC-STACK DATA -STACK 0007 -RADWASTE VOLUME REDUCTION BEGAN OPERATION:

CEASED OPERATION:

11 / 1982/DESCRIPTION CORRECTION:

I DIAMETER (FT): HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F): IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM SCALE METHOD: ACCURACY WHERE MEASURED : Center Of Facility 2.70 57 11537 REPORTED -728 REPORTED -42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL MUSSIONS REPORT -2008 Page: Date: 033 11-14-2008 141820AAA

-Uxelon Generation Co LLC-STACK DATA -STACK 0019 -GASOLINE STORAGE AND HANDLING POINT 00012 BEGAN OPERATION:

CEASED OPERATION:

12 / 1998/DESCRIPTION CORRECTION:

I DIAMETER (FT)-: HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F): 0.20 14 IEPA -IEPA -2 70 REPORTED -REPORTED -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM SCALE METHOD: ACCURACY WHERE MEASURED :Center Of Facility 42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control Page: 034 Date: 11-14-2008 DAPC -ANNUAL DUBSSIONS REPORT -2008 141820AAA

-Exelon Generation Co LLC-STACK DATA -STACK' 0020 :- SMALL ENGINES TYPICAL BEGAN OPERATION:

CEASED OPERATION:

09 I 197S/DESCRIPTION CORRECTION:

I DIAMETER (FT) : HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F) : 2.50 29 16397 REPORTED -368 REPORTED -IEPA -IEPA -LATITUDE (DD:NM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM: SCALE METHOD: ACCURACY WHERE MEASURED :Center Of Facility 42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2008 Page: 035 Date: 11-14-2008 141820AAU

-Exelon Generation Co LLC-STACK DATA -STACK 0021 -COOLING TOWER NATURAL DRAFT BEGAN OPERATION:

CEASED OPERATION:

09 /.1978/DESCRI PTION CORRECTION:

DIAMETER (PT): HEIGHT (FT): FLOW RATE (ACFM) : TEMPERATURE (F)-IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM : SCALE : METHOD: ACCURACY WHERE MEASURED : Center Of Facility 14.90 57 361801 REPORTED -76 REPORTED -42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL SrSSIONS REPORT -2008 Page: Date: 036 11-14-2008 141820AAA

-Exelon Generation Co LLC-STACK DATA -STACK 0022 -COOLING TOWERS, 8 INDUCED DRAFT BEGAN OPERATION:

CEASED OPERATION:

//DESCRIPTION CORRECTION:

DIAMETER (FT): HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F): IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM SCALE METHOD: ACCURACY WHERE MEASURED : Center Of Facility 14.20 30 282068 REPORTED -85 REPORTED -42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Report: APCA0531 Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNUAL EMISSIONS REPORT -2008 Page: 037 Date: 11-14-2008 141820AAA

-Exelon Generation Co LLC-STACK DATA -STACK 0023 -lB AUXILIARY DIESEL FEEDWATER PUMP BEGAN OPERATION:

CEAJSED OPERATION:

09 / 1978/DESCRIPTION CORRECTION:

DIAMETER (FT) : HEIGHT (FT): FLOW RATE (ACFM) : TEMPERATURE (F): 0.83 103 2800 REPORTED -612 REPORTED -IRPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM: SCALE METHOD: ACCURACY WHERE MEASURED :Center Of Facility 42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 Iteport: APCA053l Illinois Environmental Protection Agency Division of Air Pollution Control DAPC -ANNIUAL ISSIONS REPORT -2008 Page: 038 Date: 11-14-2008 141820AAA

-Exelon Generation Co LLC-STACK DATA -STACK 0024 -2B AUXILIARY DIESEL FEEDWATER PUMP BEGAN OPERATION:

CEASED OPERATION:

//DESCRIPTION CORRECTION:

I DIAMETER (PT) : HEIGHT (FT): FLOW RATE (ACFM): TEMPERATURE (F): 0.83 103 2800 REPORTED -612 REPORTED -IEPA -IEPA -LATITUDE (DD:MM:SS.SSSS):

LONGITUDE (DD:MM:SS.SSSS):

DATUM: SCALE : METHOD: ACCURACY WHERE MEASURED : Center Of Facility 42:04:26.9400 89:16:58.0800 NAD27 12000 019 20 EN-AA-105 Revision 4 Page 14 of 14 Attachment 2 Example Verification Completion Form Page 1 of 1 Verification Documentation Correspondence/Letter number: 2009- (,053 Origination Date: 04/21/09 Agency/External Stakeholder:

IEPA Submittal Due Date: 04/24/09 Recipient of Correspondence:

Bureau of Air, Air Quality Planning Section (39)(name and title if known)Purpose of Submittal:

2008 Annual Emission Report Originating Office: EL Cantera ' Kennett Square 91 Site Byron (specify)Preparer:

Zoe Cox_. -z Peer Reviewer:

Dave Starke (prit i p (date) -_(print) (sign) (date)Certified Mail Return Receipt Requested:

-'Yes --No Approvals (check box if applicable)

Applicable Date Review Signature of Reviewer Date of Needed Review Site Departments Chemistry 04/22/09 Operations Engineering E"-_Regulatory Assurance 04/23/09 .Other: (specify)

-Corporate SME/FAM I-11 Site Management, Piant Managerj..'

______ 04/24/09 J SitenVice President--___~___Of 1 Report Signed and Approved Site Vice President fcm n Attach additional page for comments.

Byron Environmental Audit -Request for Additional Information Response Question #: Met-3 Category: Meteorology, Air Quality and Noise Statement of Question: Identify combustion sources of hazardous air pollutants (HAPs) at Byron and amount released for the most recent five years.Response: Sources of Hazardous Air Pollutants (HAPs) at Byron Station are small engines (less than or equal to 600 HP) and large engines (greater than 600 HP). The total annual quantity of HAPs from small and large engines at Byron is well below the HAPs significance level of 10 tons per year. Hence, HAPs are not reported for Byron. The quantities and types of fuel used at Byron by these engines are reported in the annual air emissions reports, copies of which are provided in the Request for Additional Information Response Met-2.The applicable HAPs emission factors (from USEPA, AP-42, Fifth Edition) for small and large engines at Byron are listed below: Small Engines Emission Large Engines Emission Boiler Emission Factor Factor (lb/MMBTU)

Factor (lb/MMBTU) (lb/1 000 gallons)Benzene 9.33 E-04 7.76 E-04 2.14 E-04 Toluene 4.09 E-04 2.81 E-04 6.20 E-03 Xylenes 2.85 E-04 1.93 E-04 1.09 E-04 1,3 Butadiene

< 3.91 E-05 No Data No Data Formaldehyde 1.18 E-03 7.89 E-05 3.30 E-02 Acetaldehyde 7.67 E-04 2.52 E-05 No Data Acrolein < 9.25 E-05 7.88 E-06 No Data Naphthalene 8.48 E-05 1.30 E-04 1.13 E-03 Fuel usages for the most recent 5 years for large engines (6 large diesel engines) and boilers (2 auxiliary boilers) and small engines (as reported in the annual emissions reports) are as summarized in the table below.Small Engines Large Engines Auxiliary Boilers (gallons) (gallons)

(1000 gallons)2008 1,600 @ 137,481 BTU/gal 83,300 @ 137,481 BTU/gal 0.6 2009 1,050 @ 137,600 BTU/gal 109,900 @ 137,600 BTU/gal 0.4 2010 600 @ 137,690 BTU/gal 96,100 @ 137,690 BTU/gal 0.5 2011 550 @ 137,447 BTU/gal 90,900 @ 137,447 BTU/gal 0.5 2012 510 @ 137,357 BTU/gal 127,800 @ 137,357 BTU/gal 4.2 List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: Met-4 Category: Meteorology, Air Quality and Noise Statement of Question: Are there expected upgrade/replacement activities for equipment/operation that could increase or decrease air emissions over the license renewal period?Response: No upgrade/replacement activities are planned for equipment/operation that could increase or decrease air emissions during the Byron period of extended operation.

List Attachments Provided: None

.. 41 .1 Byron Environmental Audit -Request for Additional Information Response Question #: Met-5 Category:

Meteorology, Air and Noise Statement of Question: The ER provides carbon dioxide (C02) emissions from stationary combustion sources at Byron.Provide available site-wide emission inventory data (annual) for greenhouse gases (GHG) for the most recent 5 years. Emissions should include stationary combustion sources, mobile sources (commuters, visitors, delivery vehicle, etc.), and other sources (refrigerant leakage, emissions from switchyard, etc.). Address the following:

a. Identify and discuss the GHG emission sources;b. Provide information (e.g. operating hours per year, fuel consumption and rates, and energy rating as applicable for each source) used to support the GHG emission values provided; and c. Provide a description of procedure EN-AA-201-2020.

Response: a. For Byron Station, the following potential sources of GHG emissions have been identified:

Direct Emergency Diesel Generator 1 Emergency Diesel Generator 2 Emergency Diesel Generator 3 Emergency Diesel Generator 4 Emergency Diesel Generator U1 AF Emergency Diesel Generator U2 AF Auxiliary Boiler Ul -93 MMBTU Auxiliary Boiler U2 -93 MMBTU Small Diesel Engines Propane Fired Engines C02 purge/fire protection system R134a (HFC-134a)

SF6 (Sulfur hexafluoride)

Indirect Electricity consumption Supplemental Halon 1211 Halon 1301 R11 (Trichlorofluoromethane)

R22 (Monochlorodifluoromethane)

R1 14 (Dichlorotetrafluoroethane)

b. The table below summarizes the site-wide Byron Station GHG emission inventory data.Mobile sources are not included because Exelon Corporation does not compile site-specific data for such sources.I Byron Station GHG Emissions Summary (2008 through 2012)[GHG C02 Equivalents (metric tons)]2008 2009 2010 2011 2012 Direct Stationary Combustion 854.51 1,294.47 985.85 937.83 1,357.67 Direct C02 Fugitive 13.96 16.92 17.30 32.49 18.30 HEC / PEG Refrigerants 0.00 732.37 2,669.44 383.29 0.00 Indirect -~ _____._ IMM ML Purchased Electricity 1 5,721.07 7,146.84 7,698.39 7,034.23 Ozone Depleting I Refrigerants 5,094.21 3,106.73 1,239.89 2,965.14 5,551.97 Fuel usages reported in the Byron annual emissions reports for large engines (6 large diesel engines), boilers (2 auxiliary boilers), and small engines are as summarized in the table below for the most recent 5 years. These GHG emissions sources comprise the Direct Stationary Combustion category shown in the table above.Small Engines Large Engines Auxiliary Boilers (gallons) (gallons)

(1000 gallons)2008 1,600 @ 137,481 BTU/gal 83,300 @ 137,481 BTU/gal 0.6 2009 1,050 @ 137,600 BTU/gal 109,900 @ 137,600 BTU/gal 0.4 2010 600 @ 137,690 BTU/gal 96,100 @ 137,690 BTU/gal 0.5 2011 550 @ 137,447 BTU/gal 90,900 @ 137,447 BTU/gal 0.5 2012 510 @ 137,357 BTU/gal 127,800 @ 137,357 BTU/gal 4.2 c. Exelon Generation has adopted Procedure EN-AA-201-2020, "Green House Gas Program," to define roles and responsibilities for ensuring the establishment of the Exelon greenhouse gas (GHG) inventory, which includes data on emissions, reductions of emissions, and offsets of emissions.

The procedure provides for tracking and reporting of the parameters needed to assist Exelon Corporation in (1) complying with the U.S. EPA Climate Leaders program and the ISO 14064 Greenhouse Gases -Part 1 standard, and (2) meeting internal Exelon reporting requirements and voluntary commitments to the U.S. EPA Climate Leaders program. The procedure further specifies that GHG emissions for Exelon Nuclear sites will be tracked separately in accordance with the Mandatory Greenhouse Gas Reporting Rule (40 CFR Part 98) and monitored for change, but the procedure notes that baseline emissions established in 2009 for all Exelon Nuclear sites were significantly below the mandatory reporting threshold set forth in the Rule.Procedure EN-AA-201-2020 directs Exelon Nuclear personnel to calculate GHG emissions for Exelon Nuclear sites using activity data and emission factors and to document the following data where it can be quantified.

  • Direct emissions for each GHG* GHG removals* Energy indirect GHG emissions (i.e., generation of imported electricity, heat or steam consumed by the site)2
  • Other indirect GHG emissions* Direct C02 emissions from the combustion of biomass In accordance with the procedure, the following data components are collected quarterly (except as indicated) from Exelon Nuclear sites to populate the G HG inventory database.* Stationary Source Fuel Usage (based on air emissions permit compliance data)* Refrigerant Usage (net usage based on purchases)
  • Fire Training Activities (annual sum in pounds of materials burned)* Supply Chain Data (purchases) of the following:

o Gasoline o Diesel Fuel (on-road)o Propane o SF6 o Halon o Carbon Dioxide for Chemical Injection o Carbon Dioxide for Fire Protection Details of the process used by Exelon Nuclear for collecting, calculating, and maintaining the GHG inventory data are institutionalized in an Inventory Management Plan (IMP).List Attachments Provided: None 3 Byron Environmental Audit -Request for Additional Information Response Question #: Met-6 Category: Meteorology, Air Quality and Noise Statement of Question: Provide the following meteorological information from the data recorded at Byron's meteorological facility.

The meteorological data should include the most recent 5 years for which data is available.

Provide the following information:

a. Mean monthly and annual temperatures.
b. Mean monthly precipitation and annual precipitation.
c. Seasonal and annual summary wind statistics in the form of wind direction and speed frequency distribution tables and wind roses. Discuss predominant wind direction and speed by season and annual average, local terrain features affecting wind direction and speed, and provide a value for annual average wind speed.Response: a. Mean monthly temperature data are presented in the Byron Station Monthly Report on the Meteorological Monitoring Program, Section 7. These monthly reports provide the basis for the Byron Station Annual Report on the Meteorological Monitoring Program. The average monthly mean temperatures and the average annual temperature for the years 2008 through 2012 are presented in the table below.Byron Station Mean Monthly Temperatures (OF)2008-2012 AVERAGE Monthly 2008 2009 2010 2011 2012 Mean January 21 13.5 17.7 18.2 27.5 19.58 February 19.9 26.2 24.2 24.8 30.1 25.04 March 32.7 38.1 41.2 35.4 51.8 39.84 April 48.6 47.8 55 47.1 49.4 49.58 May 57 59.6 61.4 59.4 64.9 60.46 June 69.5 68 69.8 69.8 71.9 69.8 July 71.5 66.2 74.2 76.5 78.2 73.32 August 68.8 67.2 73.3 71 70.6 70.18 September 63.8 62.5 63.2 59.4 61.8 62.14 October 50.8 46.6 54.6 53.3 49.1 50.88 November 37.8 44.2 40.1 41.7 39 40.56 December 19.6 24.3 19.7 32.5 32.6 25.74 AVERAGE Annual 46.75 47.02 49.53 49.09 52.24 ___......1 of 4
b. Monthly and annual total precipitation data are presented for each year in the Byron Station Annual Report on the Meteorological Monitoring Program, Table 12. The mean monthly and annual total precipitation during 2008 through 2012 are presented in the table below. Copies of the annual reports are attached.Byron Station Monthly and Annual Precipitation Totals and Means (inches)*2008-2012 2008 2009 2010 2011 2012 MEAN January 0.55 0.65 0.89 0.77 0.97 0.77 February 2.31 2.06 0.64 1.9 1.71 1.72 March 0.99 6.06 1.62 2.24 2.21 2.62 April 4.69 4.9 2.65 3.64 2.93 3.76 May 3.21 4.33 5.38 4.86 2.44 4.04 June 4.5 6.6 7.04 2.64 0.84 4.32 July 6.05 3.12 9.91 5.84 3.29 5.64 August 2.09 6.49 4.08 4.35 2.73 3.95 September 6.6 2.04 2.39 4.48 1.41 3.38 October 1.89 6.44 3.23 1.6 3.45 3.32 November 1.6 1.1 1.42 4.09 0.68 1.78 December 4.48 3.63 1.38 2.05 2.42 2.79 ANNUAL 38.96 47.42 40.63 38.46 25.08 38.11* Some data are missing -- actual precipitation may be under-reported.
c. Seasonal and annual summary wind statistics in the form of wind direction and speed frequency distribution tables and wind roses are provided by season and for the year in each Byron Station Annual Report on the Meteorological Monitoring Program, Tables 7 through 11. Copies of the annual reports for the years 2008 through 2012 are attached.The table on the following page presents the predominant quarterly and annual wind speeds and directions at the 30-ft level for the years 2008 through 2012.The predominant wind direction at the Byron site was south for three of the five years from 2008 through 2012. Slight seasonal variations are evident from the data, but the wind speed falls into either the 3.6 to 7.5 mph wind speed class or the 7.6 to 12.5 mph wind speed class most of the time, with the 3.6 to 7.5 mph class prevailing slightly on an annual basis. The Byron Station Annual Report on the Meteorological Monitoring Program does not calculate an average yearly wind speed. However, the data suggest it to be around the midpoint between 3.6 mph and 12.5 mph, which is approximately 8.1 mph.The primary topographic feature in the area is the Rock River at an elevation just under 700 feet. The slope from higher terrain at the plant to the river is generally gradual in all directions.

Terrain within a 50-mile radius of the Byron site is generally level, imposing little obstruction to mesoscale air flow. (Exelon Nuclear 2010a, Section 2.3.2.3)2 of 4 v Byron Station Predominant Wind Speed (miles/hr) and Direction (at 30 ft)2008 to 2012 2008 2009 2010 2011 2012 Speed Direction Speed Direction Speed Direction Speed Direction Speed Direction 1st Qtr 7.6 to 12.5 W 7.6 to 12.5 WNW 3.6 to 7.5 NW 7.6 to 12.5 NW 7.6 to 12.5 S 2nd Qtr 7.6 to 12.5 S 7.6 to 12.5 WNW 7.6 to 12.5 E 7.6 to 12.5 E 7.6 to 12.5 E 3rd Qtr 3.6 to 7.5 S 3.6 to 7.5 E 3.6 to 7.5 S 3.6 to 7.5 NNW 3.6 to 7.5 S 4th Qtr 7.6 to 12.5 S 7.6 to 12.5 W 3.6 to 7.5 WNW 7.6 to 12.5 S 3.6 to 7.5 S Annual 3.6 to 7.5 S 3.6 to 7.5 WNW 3.6 to 7.5 WNW 3.6 to 7.5 S 3.6 to 7.5 S% of Total 39.29% 9.95% 36.72% 9.33% 37.79% 9.20% 36.51% 8.64% 36.99% 10.52%3 of 4 4 List Attachments Provided: 1. Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station, 2008. Prepared for Exelon Nuclear by Murray and Trettel, Inc.February 24, 2009.2. Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station, 2009. Prepared for Exelon Nuclear by Murray and Trettel, Inc.March 1,2010.3. Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station, 2010. Prepared for Exelon Nuclear by Murray and Trettel, Inc.May 1,2011.4. Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station, 2011. Prepared for Exelon Nuclear by Murray and Trettel, Inc.April 3, 2012.5. Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station, 2012. Prepared for Exelon Nuclear by Murray and Trettel, Inc.March 13, 2013 4 of 4 Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station 2008 prepared for Exelon Nuclear Warrenville, IL 60555 by Murray and Trettel, Incorporated 600 First Bank Drive, Suite A Palatine, IL 60067 (847) 963-9000 e-mail: mt@weathercommand.com For Exelonn e Only Reviewed By: Date:___________

Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 6oo67 .(847) 963-9000 Table of Contents Section Descrpntion Pae List of Tables .......................................................................................

ii 1 Introduction

.........................................................................................

I 2 Sum m ary ............................................................................................

2 3 Data Acquisition

...................................................................................

3 4 Data Analysis ....................................

5 5 Results .....................................................................................................

10 Site Calibration logs ......................................

...........................

Appendix Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 List of Tables Number Description Page 1 Instrument Locations

.........................................................................

4 2 Data Loggers ....................................

4 3 Wind Direction Classes ...................................................................

7 4 Wind Speed Classes ......................................................................

7 5 Atmospheric Stability Classes ..........................................................

8 6 Data Recovery Summary .....................................................................

11 7 Wind Rose, January-March 2008 ..................................................

14 8 Wind Rose, April-June 2008 ..........................................................

16 9 Wind Rose, July-September 2008 ....................................................

18 10 Wind Rose, October-December 2008 ..........................................

20 11 Wind Rose, January-December 2008 ...........................................

22 12 Precipitation Totals .......................................................................

24 13 Maximum Doses Resulting From Airborne Releases .....................

25 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Introduction The purpose of the meteorological program being conducted at the Byron Station site is to provide information sufficient to assess the local weather conditions and to determine the degree of atmospheric dispersion of airborne radioactive effluent from the station.The meteorological tower is 250 ft. high and is instrumented at two levels. Wind speed and direction are measured at 30 ft. and 250 ft. Ambient temperature is measured at 30 t. Differential temperature, referenced to 30 ft., is measured at 250 ft. Dew point temperature is measured at 30 ft. Precipitation is measured at approximately 3 ft.Joint frequency stability wind rose tables of wind direction, wind speed, and stability are routinely tabulated from hourly measurements.

The quarterly and annual tables are included in this report.Descriptions of the instruments and digital recorder are given in Section 3 (Data Acquisition) of this report. Data reduction and processing are described in Section 4 (Data Analysis).

The results given in Section 5 of this report include modeled maximum whole body doses, skin doses, organ doses based upon airborne releases, and site meteorology.

Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60o67 (847)963-9ooo .2. Summary The Byron Station meteorological monitoring program produced 52,414 hours0.00479 days <br />0.115 hours <br />6.845238e-4 weeks <br />1.57527e-4 months <br /> of valid data out of a possible 52,704 parameter hours during 2008 (366 days x 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s/day x 6 measured priority parameters), which represents an overall data recovery rate of 99.4%. Priority parameters are all parameters except dew point temperature and precipitation.

The stability wind rose tables included in this report have been generated using the 30 ft.wind data with the 250-30 ft. differential temperature data.The maximum annual calculated cumulative doses resulting from airborne releases were as follows.Unit 1: gamma air dose beta air dose whole body dose skin dose organ (teenager thyroid)Unit 2: gamma air dose beta air dose whole body dose skin dose organ (teenager thyroid)3.539 x 10" 3 mrad 1.905 x 10"3 mrad 1.925 x 10"3 mrem 3.937 x 10 4 mrem 4.753 x 10" mrem-1.048 x 10 4 mrad-4.328 x1 0 4 mrad-5.769 x lO 5 mrem-2.563 x 104 mrem-9.040 x 10 4 mrem Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 3. Data Acquisition Wind speed and direction are measured with Climatronics F460 wind sensors. The wind speed sensors have a starting speed of 0.5 mph (0.22 mps), a range of 0 to 100 mph (0 to 44.7 mps), and a system accuracy of +/-1.0 mph at 100 mph (+/-0.45 mps at 44.7 mps). The wind direction sensors have a threshold speed of 0.5 mph (0.22 mps), a range of 0 to*540 0 , and a system accuracy of +/-50.Ambient and differential temperatures are measured with the Climatronics 100093 system. Ambient temperature is measured within the range of -22 to 122 0 F (-30.0 to 45.0°C) with an accuracy of +/-0.5 0 F (+0.3 0 C). Differential temperature is measured within the range of -10.0 to 10.0°F (-5.6 to 5.6 0 C) with an accuracy of +/-0.18 0 F (+/--0.10C).

Dew point temperature is measured with the Climatronics 101197 system. Dew point temperature is measured with the range of -22 to 1.22 0 F (-30.0 to 45.0°C) with an accuracy of +/-2.7 0 F (1.5 0 C).Precipitation is measured with a Climatronics 100097-1 tipping bucket rain gauge and is measured in increments of one one-hundredth of an inch with a system accuracy of+0.01" (+/-0.25mm).

Instrument types and locations are summarized in Table 1.The meteorological data are collected and stored by a Campbell Scientific CR1000 Data Logger. The Campbell Scientific CR1000 measures the analog voltages of the instruments and records the digital equivalent within the range of 0 to +5 volts. Data are obtained from the Campbell Scientific CR1000 by a direct dial telephone hookup to an in-house computer system.As a backup to the CR1000, data are also recorded with a Johnson Yokogawa Corp. digital recorder (JYC DA100 data acquisition unit). Data are sampled every 10 seconds.Data loggers are summarized in Table 2.Murray & Tvettel, Inc. 600 First Bank Drive, Suite A Pdaline, Illinois 60067 (847) 963-9000 Table 1 Instrument Locations Measurement Wind Speed Wind Direction Differential Temperature Wind Speed Wind Direction Ambient Temperature Dew Point Temperature Sensor Type .Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 1001197 Climatronics 100097-1 Location Tower Tower Tower Tower Tower Tower Tower Ground Elevation 250 ft.250 ft.250 ft.30 ft.30 ft.30 ft.30 ft.Precipitation

.3 ft.Table 2.Data Loaaers Sampling Measurement Lopper Type Frequency Winds, Temperatures, Campbell Scientific CR1000 1 sec.and Precipitation Winds, Temperatures, Johnson Yokogawa Corp. Digital Recorder 10 sec.and Precipitation (JYC DA100 and Contec IPC-PT/M300(PC)WOU) digital recorder Murray & Trettel, Inc. 6o0 First Bank Drive, SuiteA Palatine, Illinois 60067 (847) 963-9000 4. Data Analysis The Byron data logger is routinely interrogated to obtain hourly average data. The data are then stored in the meteorological data base and listings of the data are generated.

The data listings are examined by qualified personnel and any apparent problems are brought to the attention of the Project Manager or Meteorological Technician and the Instrument Maintenance staff.Hourly values of wind speed, wind direction, ambient temperature, differential temperature, dew point temperature, and precipitation are obtained through measurements taken at the site. The standard deviation of wind direction (sigma) is derived. The wind direction variation is described in terms of the standard deviation of the direction about the mean direction.

The CR1000 computes an hourly value of wind sigma by taking the Root-Mean-Square (RMS) of the four quarter-hour wind sigma values. The quarter-hour wind sigma values are calculated directly from the one second wind direction samples during the 15 minute period.The data base files are edited approximately once a week. Missing data logger values are replaced with digital recorder values, when available.

Invalid data are deleted from the data base.When an hourly value is missing or invalid, the numeral 999 is entered into the computer data file in the appropriate location.

When the wind direction changes substantially relative to its short term fluctuations, the numeral 888 can be entered into the wind sigma location to indicate shifting winds. When the wind blows with velocities near the sensing threshold of the instrument, the numeral 777 can be entered into the wind direction, wind speed, and wind sigma locations to indicate light and variable winds.Murray & Treuel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 A professional meteorologist reviews the data, calibration findings, equipment maintenance reports, and other information and determines which data are valid. Only the valid data are retained in the data base.As a quality control measure, a monthly comparison is made of Microtel and digital recorder data. An investigation is made into the reasons for any significant differences between the sets of values.Joint frequency stability wind rose tables of hourly data measured at the site are generated.

These tables indicate the prevailing wind direction, wind speed, and stability classes measured during the period of observation as well as the joint frequencies of occurrence of the wind direction, wind speed, and stability classes. The, values are also used as input to the atmospheric transport and diffusion models. Wind direction; wind speed, and stability classes are given in Tables 3, 4, and 5.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 Table 3 Wind Direction Classes IF IF IF IF IF IF..IF IF IF IF IF IF IF IF IF IF 348.750 <11.250 <33.750 <56.250 '<78.750 <101.250 <123.750 <146.250 <168.750 <191.250 <213.75° <236.250 <258.750 <281.250 <303.750 <326.250 <WD <WD, WD <WD <WD <WD <WD <WD <WD~WD_WD <C WD <WD <WD <WD <WD <11.250 THEN Class is N 33.750 56.250 78.750 101.250 123.750 146.250 168.750 191.250 213.750 236.250 258.750 281.250 303.750 326.250 348.750 THEN Class is NNE THEN Class is NE THEN Class is ENE THEN Class is E THEN Class is ESE THEN Class is SE THEN Class is SSE THEN Class is S THEN Class is SSW THEN Class is SW THEN Class is WSW THEN Class is W THEN Class is WNW THEN Class is NW THEN Class is NNW Table 4 Wind Speed Classes IF 0.0 mph < WS < 0.5 mph THEN Class is IF 0.5 mph < WS < 3.5 mph THEN Class is IF 3.5 mph < WS < 7.5 mph THEN Class is IF 7.5 mph < WS < 12.5 mph THEN Class is IF 12.5 mph < WS, < 18.5 mph THEN Class is IF 18.5 mph < WS < 24.5 mph THEN Class is IF 24.5 mph < WS THEN Class is I 2 3 4 5 6 7 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847).963-9ooo Table 5 Atmospheric Stability Classes Differential Temperature Interval Class (in C/I100m) (1)Differential Temperature Interval (in OF over the 250-30 ft. interval)

(2)Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable-1.9 <-1.7 <-1.5 <-0.5 <1.5 <4.0 <AT AT AT AT AT AT AT-1.9-1.7-1.5-0.5 1.5 4.0-2.3 <-2.1.-1.9 <-0.7 <1.8 <4.8 <AT AT AT AT AT AT AT-2.3-2.1-1.9-0.7 1.8 4.8 (1) from ANSI/ANS 2.5 (2) ANSI/ANS 2.5 Intervals scaled for instrument heights on the Byron meteorological tower Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9qoo A description of the procedures and computational techniques used to calculate the doses resulting from radioactive releases is found in the Murray and Trettel, Inc. "Offsite Dose Calculation Manual" (ODCM-Rev.

9), dated January 1996. The ODCM describes the atmospheric transport and diffusion models used to calculate the doses and concentrations resulting from airborne releases.Murray & Trettel, Inc. 600 i'rst Bank Drive, Suite A Palatine, Illinois 6oo67 (847) 963-gooo 5. Results 5.1 Instrument Maintenance The maintenance program followed during 2008 was composed of routinely scheduled visits and equipment repairs. Routine site visits were made to inspect the sensing and recording systems for proper operation.

In addition, routine maintenance and calibration checks of all tower-mounted and ground level equipment were performed every four months. A description of the calibration and field procedures is found in the Murray and Trettel, Inc. "P1009 Procedures Manual" (June 2008).In January, the 250 ft. wind direction sensor was replaced due to lower than expected readings.

Throughout January, preparations were made for an equipment upgrade. Also in January, the digital recorder was replaced due to communication problems.In March, a phone line for the met shelter was repaired.

Also in March, the 250 ft.wind direction sensor was replaced due to bad readings.

Cross arms, temperature assemblies.

and junction boxes were installed in preparation for the equipment upgrade.in April, the majority of the meteorological upgrade was completed.

The new rain gauge had yet to be installed.

In May, the annual tower inspection was performed.

The new rain gauge was also installed.

In July, the data logger was unreachable by modem. The unit Was rebooted to restore communication.

Also in July, guy wire tensions were adjusted.In August, a 93 MPH gust recorded by the control room was confirmed.

As a result, an emergency tower inspection was performed.

The tower was found to be undamaged.

A new junction box for the rain gauge was also installed.

In December, some 30 ft. wind speed data was lost due to an ice storm.No other significant problems were encountered with the equipment, and at the end of the year, no problems were evident at the site.Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 5.2 Data Recovery The record of data recovery for the year is summarized in Table 6.Table 6 Byron Site Data Recovery Summary 2008 Recovered Elevation Hours Recovered Percent Lost Hours Percent Changed Measurement Wind Speed Wind Speed Wind Direction Wind Direction Ambient Temperature Differential Temperature Dew Point Temperature Precipitation 30 ft.250 ft.30 ft.250 ft.30 ft.250-30 ft.30 ft.3 ft.8748 8684 8758 8718 8754 8752 8754 8620 99.6 98.9 99.7 99.2 99.7 99.6 99.7 98.1 36 100 26 66 30 32 30 164 1.1 1.3 1.7 2.9 0.3 0.5 3.3 2.3 AVERAGE.*

99.4*average of priority parameters (all except dew point temperature and precipitation)

Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9o00 5.3 Summary of Billings for Equipment Repairs, Replacement Parts, and Other Work not Included in Fixed-Cost Maintenance Aareement

-2008 Description

-Byron Cost January Meteorological equipment maintenance

$ 950.58 Meteorological parts, materials, and contractor services 1,134.25 February Microtel equipment maintenance 75.00 March Meteorological equipment maintenance 1,347.10 Meteorological parts, materials, and contractor services 88.94 2007 X/Q Calculations 500.00 Exelon Badge 167.57 Meteorological System Upgrade 5,000.00 Meteorological parts, materials, and contractor services 551.68 May Meteorological equipment maintenance 300.00 Meteorological parts, materials, and contractor services 535.53 June Meteorological equipment maintenance 150.00 Meteorological parts, materials, and contractor services 466.62 Meteorological parts, materials, and contractor services .2,288.05 Data Logger equipment maintenance

.337.80.Meteorological parts, materials, and contractor services 28.93 Meteorological equipment maintenance 927.34 geDtember Meteorological parts, materials, and contractor services 411.26 October Meteorological equipment maintenance 100.00-November Meteorological parts, materials, and contractor services 242.08 December-none- 0.00 Annual Total: $15,602.73 Murray df Trette4 Inc. 600 First Bank Drie, Suite A Palatire, Illinois 60067 (847) 963-9000 5.4 Stability Wind Rose Data The quarterly andannual stability wind roses are given in Tables 7 through 11. Wind speed classes have been altered to reflect the sensor threshold.

For the year, winds measured at 30 ft. most frequently came from the south (9.95%) and fell into the 3.6-7.5 mph and 7.6-12.5 mph wind speed classes (39.29% and 33.34%respectively).

Calms (wind speeds at or below the sensor threshold) were measured 0.00% of the time. Speeds greater than 24.5 mph were measured 0.23% of the time.Stability based on the 250-30 ft. differential temperature most frequently fell into the neutral classification (48,16%).Murray & Trettel, Inc. 6o0 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 I TABLE 7-14-'Byron Generating Station 30 ft. Wind Speed and Direction January-March.

2008 250Ft-30Ft Delta-T (F)Number of Observations

-2164 Values are Percent Occurrence SPEED ..................

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,'CLASS N NNE NE ENE E ESE WIND D1IRECTION CLASSES ----...............................

STABILITY CLASSES ----------

SE SSE S SSW -SW WSW W WNW NW NNW TOTAL EU KU SU N SS IM ES TOTAL I EU MU C SU A N IL SS M S ES I EU I'-N 3 SS ES EU MU 4 5t 8 SU-N 2MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.09 0.05 0.97 0.42 0.09 0.00 0.00 0.09 0.23 2.13 0.42 0.00 0.00 0.00 0.00 0.14 0.83 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 ooo 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.28 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 1.39 0.28 0.00 0.00 0.00 0.00 0.00 1.34 0.09 0.00 0.00 0.00 0.09 0.09 0.55 0.00 0.00 0.00 0.00 0.00 0.05 0.37 0.18 0.00 0.00 0.00 0.00 0.05 0.74 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.09 0.00 0.00 0.00 0.00 0.55 0.28 0.05 0.00 0.00 0.00 0.00 1.20 0.18 0.00 0.00 0.00 0.00 0.00 0.65 0.28 0.00 0.00.0.00 0.00 0.00 0.14 0.09 0.09 0.00 0.00 0.00 0.00- 0.00 0.14 0.00 1.76 0.69 0.42 0.74 0.05 0.05 0.05- 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00.0.05 0.00 0.00 0.00 1.25 0,.97 0.09 0.00 0.05 0.00 0.09 1.62 0.46 0.00 0.00 0.05 0.05 0.05 0.23 0.05 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.65 0.55 0.23 0.05 0.00 0.00 0.00 2.59 1.71 0.23 0.23 0.00 0.00 0.00 0.28 0.32 0.32 0.05 0.00 0.00 0.00 0.00 0. 00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.23 0.23 0.00 0.00 0.00 0.74 0.23 0.23 0.51 0.00 0.00 0.00 1.85 1.48 0.09 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.09 0.05 0.23 0.00 0.00 0.00 0.51 0.32 0.23 0.42 0.00 0.00 0.00 0.74 0.46 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.28 0.28 0.18 0.00 0.00 0.00 0.92 0.88 0.14 0.00 0.00 0.00 0.00 0.88 0.42 000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.74 0.74 0.28 0.37 0.51 0.14 0.28 0.42 0.00 0.18 0.14" 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 1.02 2.17 1.34 0.74 0.92 1.29 0.09 0.14 0.00 0.00 0.05 0.00'0.00 0.00 0.00 0.00 0.14 0.05" 0.09 0.42 0.23 1.29 3.10 4.76 0.32 0.09 0.46 0.00 0.00 0.00 0.00 0.00 0.00, 0.05 0.23 0.00 0.00 0.05 0.00 0.14 0.05 0.05 0.97 1.99 1.62 0.00 0.23 0.05 0.00 .0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.42 0.46 0.55 0.14 0.00 0.00 0.05.1.89 1.48 0.09 0.00 0.00 0.00 0.14 2.26 0.42 0.00 0.00 0.00 0.00 0.00 0.69 0.00 0.00 0.00 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.14 0.14 0.09 0.00 0.00 0.09 2.03 0.69 0.00 0.00 0.00 0.05 0.23 2.36 0.05 0.00 0.00 0.00 0.00 0.09 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:00 0.00 0.00 0.00 4.71 2.77 2.26 1.25 0.00 0.00 0.14 0.55 18.25 10.40 1.48 1.06 0.05 0.05 0.42 1.52 29.11 7.44 0.51 0.37 0.00 0.00 0.00 0.00 0.00 0.00 4.71 2.77.2.26 1.25 11.00 0.00 0.00 0.00 0.14 0.55 18.25 10.40 1.48 1.06 31.89 0.00.0.05 0.05 0.79 0.18 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.05 0.00 1.48 0.69 0.14 0.05 0.00 0.05 0.05 0.60 0.32 0.00 0.00 0.42 1.52 29.11 7.44 0.51 0.37 39.42 EU 1MU 3 SU-' N ISS 8NS ES 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00 1.20 0.79 0.00 0.00 0.00 0.00 0.00 0.65 0.28 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.32 0.32 0.23 0.23 0.65 11.04 2.03 0.32 0.05 0.65 11.04 2.03 0.32 0.05 14.65 Murray & Trettel, Inc. 60o First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo I TABLE 7 continued-15-Byron Generating Station 30 ft. Wind Speed and Direction January-March, 2008 250Ft-3OFt Delta-T (F)PEED .---------------------------------

W IND DIRECTION CLASSES ----------------------------------

LASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL---------

STABILITY CLASSES ----------

EU KU SU N SS MS ES TOTAL EU 1I U 9 SU 2 SS 4NH I ES EU ,T SU N 2 SS 4 MS ES 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.00 0.00 0,00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.00 0.00 0.00 0.00 0.00 0.42 0.69 0.00 0.00 0..00 0.00 0.00 0.00 0.05 0.00 0'00 0.09 0.00 0.00 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.51 1.76 0.46 0.00 0.00 0.00 0.00 0.05 0.18 0.00 0.05 0.00 0.00 0.05 0.51 1.76 0.46 0.00 0.00 2.77 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.14*0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.19 0.00 0.05 0.00 0.00 TOT 5.64 4.07 1.89 2.87 4.57 5.22 5.13 7.49 8.23 4.57 4.44 5.78 12.52 12.25 8.60 6.75 100.00 0.37 0.88 3.42 64.88 23.15 4.57 2.73 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SWWSW W WNW NNW TOTAL 0.00.0.18 0.42 4.07 0.88 0.09 0.00 0.00 0.14 0.09 3.33 0.51 0.00 0.00 0.00 0.00 0.09 1.62 0.18 0.00 0.00 0.00 0.00 0.00 2.26 0.46 0.14 0.00 0.00 0.05 0.18 3.37 0.88 0.05 0.05 0.00 0.09 0.05 2.91 1.85 0.28 0.05 0.09 0.05 0.14 3.23 1.48 0.09 0.05 0.00 0.00 0.00 3.60 2.77 0.79 0.32 0.00 0.00 0.00 4.1.6 2.73 0.55 0.79 0.00 o.aob 0.00 2.22 1.34 0.32 0.69 0.00 0.00 0.00 2.26 1.57 0.42 0.18 0.05 0.00 0.23 3.93 1.34 0.23 0.00 0.23 0.23 1.11 8.69 1.62 0.42 0.23 0.00 0.09 0.51 8.78 2.31 0.42 0.14 0.00 0.00 0.00 0.05 0.18 0.42 5.27 5.18 2.36 0.88 0.65. 0.14 0.14 0.09 0.37 0.88 3.42 64.88 23.15 4.57 2.73-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.18 1.62 2.87 0.97 0.00 0.00 0.00 0.18 1.71 1.43 0.74 0.00 0.00 0.00 0.28 0.60 0.79 0.23 0.00 0.00 0.00 0.32 0.88 1.39 0.28 0.00 0.00 0.00 0.92 2.40 1.06 0.18 0.00 0.00 0.00 0.32 1.48 2.40 1.02 0.00 0.00 0.00 0.18 2.31 2.22 0.42 0.00 0.00 0.00 0.18 1.48 4.76 0.97 0.09 0.00 0.00 0.65 1.71 3.47 1.99 0.42 0.00 0.00 0.55 1.48 1.29 0,92 0.28 0.05 0.00 0.88 1.94 1.29 0.28 0.05 0.00 0.00 0.69 1.85 1.71 1.16 0.37 0.00 0.00 1.57 3.37 3.74 2.54 1.11 0.18 0.00 1.80 2.73 5.50 1.71 0.46 0.05 0.00 1.57 3.51 2.82 0.69 0.00 0.00 0.00 0.69 2.82 2.68 0.55 0.00 0.00 0.00 11.00 31.89 39.42 14.65 2.77 0.28-WIND SPEED CLASSES-CALN-3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 600 First Bank Drve, Suite A Palatine, Illinois 60067 (847) 963-9ooo I TABLE 8-16-Byron Generating Station 30 ft.. Wind Speed and Direction April-June.

2008 250Ft.30Ft Delta-T (F)Numfiber of Observations

-2158 Values are Percent Occurrence SPEED --VCLASS--------------------------------

WIND DIRECTION CLASSES ...........

NNE HE ENE E ESE SE SSE S SSW ' SW WSW.........

STABILITY CLASSES ..........

EU MU SU N IS MS ES TOTAL W WNW NW NNW TOTAL I EU MU C SU A N IS ES EU I 1 SU-N 3 SS ES MU 4SU 8N 7ISS 2S ES EU 8 SU-N 1 IS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.05 0.00 0.00 0.00 0.00 1.07 0.79 0.09 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.05 0.74 0.56 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.56 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.00 0.05 0.00 0.00 0.00 0.19 0.79 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.05 0.32 0.32 0.05 0.00 0.05 0.05 0.70 1.76 0.70 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.14 0.14 0.28.0.05 0.14 0.00 0.00 0.00 0.00 0.09 0.05 0.42 0.56 0.23 0.88 0.60 0.56 0.23 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.19 0.05 0.09 0.05 0.00 0.05 0.51 1.11 0.83 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.05 0.09 0.00 0.00 0.00 0.32 0.93 0.93 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.19 0.19 0.23 0.00.0.00 0.00 0.56 0.65 0.42 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0105 0.14 0.14 0.00 0.00 0.05 0.79 1.71 0.19 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.19 0.32 0.00 0.00 0.14 0.65 1.11 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.32 0.51 0.42 0.00 0.00 0.28 0;56 0.97 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.19 0.32 0.46 0.32 0.00 0.05 0.09 0.37 0.65 0.42 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0,00 0.05 0,00 0.23 0.23 0.46 0.51 0.23 0.05 0.00 0.00 0.05 0.00 0.05 0.05 1.07. 0.83 1.53 1.30 0.51 0.19 0.05 0.05 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.79 2.64 3.38 2.18 0.09 0.09 0.14 0.93 9.87 15.43 6.02 1.58 0.74 0.74 1.11 2.13 18.54 12.84 1.02 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.79 2.64 3.38 2.18 8.99 0.14 0.93 9.87 15.43 6.02 1.58 34.06 0.00 0.00 0.05 1.62 0.28.0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.70 0.23 0.05 0.00 0.00 0.00 0.00 0.14 0.09 0.00 0.00 0.00 0.00 0.00 0.51 0.42 0.00 0.00 0.00 0.00 0.00 0.74 0,14 0.00 0.00.0.00 0.00 0.00 1.53 0.79 0.14 0.00 0.00 0.00 0.00 0.37 0.05 0.00 0.00 0.00.0.00 0.23 1.39" 0.83 0.00 0.00 0.00.0.00 0.00 0.37 0.14 0.00 0.00 0.00 0.00 0.05 0.51 0.93 0.09 0.00 0.00 0.00 0.00 0.19 0.23 0.00 0.00 0.00 0.05 0.09 0.70 1.44 0.42 0.00 0.05 0.14 0.14 0.23 0.14 0.00 0.00 0.00 0.00 0.00 1.11 2.13 0.28 0.05 0.00 0.09 0.19 0.32 0.51 0.05 0.00 0.00 0.00 0.14 1.53 1.71 0.00 0.00 0.00 0.00 0.05 1.71 1.53 0.09 0.00 0.00 0.00 0.14 0.65 0.93 0.05 0.00 0.00 0.05 0.00 01.5i 0.79 0.00 0.00 0.00 0.23 0.23 1.25 1.16 0.00 0.00 0.00 0.00 0.00 0.83 0.42 0.00 0.00 0.05 0.00 0.28 1.99 0.51 0.00 0.00 0.05 0.14 0.00 0.46 0.19 0.00 0.00 0.14 0.14.0.00 0.93 0.46 0.00 0.00 0.05 0.05 0.14 1.11 0.32 0.00 0.00 0.05 0.00 0.19 1.30 0.46 0.00 0.00 0.00 0.00 0.09 1.30 0.05 0.00 0.00 0.42 0.46 0.56 1.53 0.19 0.00 0.00 0.09 0.23 0.19 1.30 0.37 0.00 0.00 1.11 2.13 18.54 12.84 1.02 0.05 36.42 0.19 0.05 0.14 0.05 0.14 0.14 0.60 0.42 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.37 0.65 0.88 9.41 4,59 0.14 0.00 0.65 0.88 9.41 4.59 0.14 0.00 16.03 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067. (847) 963-9ooo I TABLE 8 continued-17-Byron Generating Station 30-ft. Wind Speed and Direction April-June.

2008 250Ft-30Ft Delta-T (F)PEED ----------------------------------

CLASS N NNE NE ENE E ESE WIND DIRECTION CLASSES ..................................

SE SSE S SSW SW WSW W WNW NW NNW TOTAL.........

STABILITY CLASSES ..........

EU 14J SU N SS MS ES TOTAL IEU MHU 9 SU 2 SS 41M EES EU N 1SS ES 0,00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14"0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.14 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.00 0.05 0.60 0.19 0.00 0.00 0o.0 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.60 0.09 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.05 0.23 0.00 0.00 0.00 0.05 0.05 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.14 0.51 0.05.0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.05 0.28 2.92 0.65 0.00 0.00 0.05 0.28 2.92 0.65 0.00 0.00 3.99 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00' 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.05 0.05 0.00 0.37 0.05 0.00 0.00 0.00 0.37 0.05 0.00 0.00 0.51 TOT 4.36 2.97 2.87 4.31 7,04 3.94 6.49 8.11 10.61 6.39 7.51 6.81 7.74 6.35 8.43 6.07 100.00 1.34 1.99 4.22 41.89 36.19 10.57 3.80 100.00 Wind DirectIon by Stability N NNE NE ENE E ESE SE SSE S SSW SWWSW W WN K NNW TOTAL 0.00 0.00 0.05 2.97 1.16 0.14 0.05 0.00 0.00 0.05 1.71 1.02 0.19 0.00 0:05 0.00 0.00 1.81 1.02 0.00 0.00 0.00 0.00 0.00 2.27 1.81 0.19 0.05 O:00 0.05 0.28 2.50 3.06 1.02 0.14 0.00 0.00 0.14 1.16 1.53 0.83 0.28 0.05 0.19 0.32 1.58 2.73 1.25 0.37 0.05 0.09 0.23 2.18 3.94 1.20 0.42 0.00 0.00 0.23 4.22 4.54 1.07 0.56 0.00 0.05 0.14 2.64 2.64 0.65 0.28 0.00 0.23 0.28 3.01.3.43 0.32 0.23 0.23 0.23 0.46 3.43 1.85 0.28 0.32 0.19 0.19 0.56 3.38 2.13 0.88 0.42 0.05 0.05 0.37 3.20 1.48 0.88 0.32 0.60 0.65 0.74 3.24 1.95 0.97 0.28 0.14 0.28 0:37 2.59 1.90 0.70 0.09 1.34 1.99 4.22 41.89 36.19 10.57 3.80-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE- SSE S SSW SWWSW W WNW KW NNW TOTAL 0.00 0.19 1.99 1.95 0.09 0.14 0.00 0.00 0.19 1.44 0.97 0.23 0.14 0.00 0.00 0.00 1.07 0.93 0.88 0.00 0.00 0.00 0.23 1.02 2.46 0.42 0.19 0.00 0.00 0.74 3.34 2.46 0.51 0.00 0.00 0.00 0.28 1.58 1.58 0.42 0.09 0.00 0.00 0.56 2.27 2.69 0.70 0.28 0.00 0.00 0.37 2.83 3.57 1.16 0.19 0.00 0.00 0.32 2.64 3.38 3.38 0.83 0.05 0.00 0.74 1.67 1.76 1.34 0.70 0.19 6.00 0.32 2.83 2.87 1.25.0.23 0.00 0.00 0.60 1.99 2.83 0.83 0.42 0.14 0.00 1.39 2.18 1.67 1.67 0.70 0.14 0.00 1.30 1.58 1.99.1.44 0.05 0.00 0.00 0.97 3.24 3.15 1.07 0.00 0.00 0.00 0.79 2.41 2.18 0.65 0.05 0.00 0.00 8.99 34.06 36.42 16.03 3.99 0.51-WIND SPEED CLASSES-CALM-3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo TABLE 9-18-Byron Generating Station 30 ft. Wind Speed and Direction July-September.

2008.250Ft-3OFt Delta-T (F)Number of Observations

-2156 Values are Percent Occurrence SPEED ----------------------------------

CLASS N NNE NE ENE E ESE WIND DIRECTION CLASSES ..................................

SE SSE S SSW SW WSW W WNW NW NN TOTAL---------

STABILITY CLASSES ........EU KU SU N SS MS ES TOTAL I EU HU C SU A N ES I EU.. N 3 SS ES EU MU 4 SU-N 7 ISS'IES ES EU*MU 8 SU-N I IS 2 M ES EU 3 SU-N 1 IS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.37 0.37 0.09 0.00 0.05 0.14 2.04 0.70 0.23 0.00 0.00 0.09 0.19 1.07 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.19 0.05 0.05 0.00 0.00.0.00 0.97 0.60 0.14 0.05 0.00 0.00 0.00 0.79 0.32 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.23 0.05 0.05 0.00 0.00 0.05 0.83 0.42 0.00 0.00 0.00 0.00.0.00 0.51 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0,28 0.23 0.00 0.05 0.05 0.05 0.70 1.16 0.19 0.00 0.00 0.09 0.09 0.14 0.42 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.23 0.28 0.23 0.14 0.19 0.32 0.89 1.35 1.67 0.42 0.05 0.00 0.05 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.19 0.23 0.42 0.00 0.14 0.19 0.83 0.65 1.02 1.35 0.00 0.05 0.05 0.23 0.14 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 .0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.60 0.79 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:05 0,46 0.65 0:60 0.00 0.00 0.00 0.09 0.32 0.19 0.42 0.00 0.00 0.05 1.35 1.11 1.02 1.16 0.00 0.00 0.09 0.23 0.32 0.23 0.00 0.00 0.00 0.00 0.14 0.23 0.23'0.37 0.00 0.05 0.28 1.35 0.97 1.25 0.83 0.00 0.00 0.19 1.02 0.60 0.09 0.00 0.00 0.00 0.05 1.11 1.25 1.07 0.56 0.00 0.09 0.23 1.67 0.97 0.14 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.05 0.05 0.74 1.30 0.70 0.05 0.05 0.09 0.00 0.79 0;83 0".09 0.00 0.00 0.00 0.00 0.32 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.42 0.37 0.14 0.05 0.14 0.23 1.90 2.09 0.46 0.00 0.00 0.23 0.14 1.21 0.42 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.14 0.60 0.51 0.42 0.00 0.00 0.28 1.86 1.76 0.14.0.00 0.00*0.19 0.09 0.79 0.28 0.00 0.00 0.00 0.00 0.00 0.05 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.46 0.65 0.51 0.00 0.00 0.19 1.67 1.62 0.32 0.00 0.09 0.09 0.28 0.97 0.09 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.74 0.74 0.46 0.00 0.00 0.14 1.58 0.79 0.09 0.00J 0.00 0.00 0.09 0.60 0.14 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00.0.00 0.00 0.05 0.32 0.65 1.07 0.74 0.00 0.05 0.05 1.62 1.25 0.14 0.05 0.05 0.00 0.19 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.74 0.56 0.32 0.00 0.09 0.23 1.72 1.21 0,88 0.00 0.00 0.09 0.09 1.07 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 2.78 6.73 6.96 5.43 0.23 0.23 0.79 2.27 21.15 18.23 9.32 4.45 0.23 0.23 1.02 1.76 11.55 4.96 0.79 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 2.78'6.73 6.96 5.43 21.94 0.00 0.00 0.79 2.27 21.15 18.23 9.32 4.45 56.45 1.02 1.76 11.55 4.96 0.79 0.05 20.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0;00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00'0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00'0.00'0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.11 0.14 0.00 0.00 0.00 1.11 0.14 0.00 0.00 1.25 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 I TABLE 9 continued-19-Byron Generating Station 30 ft. Wind Speed and Direction July-September.

2008'250Ft-3OFt Delta-T (F)PEED ----------------

-----------------

WIND DIRECTION CLASSES ----------------------------------

LASS N NNE NE ENE E ESE SE SSE S SSW SW SW W WNW NW. NNW TOTAL.........

STABILITY CLASSES ----------

EU MU SU N SS MS ES TOTAL I EU MU 9 SU Imi I ES EUi N ES 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00..0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00" 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0".00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00'0.00 0.00*0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0'00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 TOT 5.61 3.53 2.55 3.71 6.03 5.71 6.59 7.61 9.42 6.86 8.02 7.10 7.28 5.9" 6.68 7.33 100.00 0.46 1.81 4.08 36.60 30.06 17.07 9.93 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE *SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.14 0.32 3.29 1.16 0.60 0.09 0.00 0.00 0.00 1.99 1.16 0.28 0.09 0.00 0.00 0.05 1.58 0.83 0.05 0.05 0.05 0.14 0.14 1.02 1,86 0,51 0,00 0.19 0.19 0.37 1.02 1.67 1.95 0.65 0.00 0.19 0.23 1.21 0.97 1.30 1.81 0.00 0.00 0.14 1.67 1.76 1.44 1.58 0.00 0.05 0.46 2.50 1.81 1.58 1.21 0.00 0.09 0.28 3.06 2.83 1.99 1.16 0.05 0.14 0:05 1.90 2.64 1.44 0.65 0.05 0.37 0.37 3.29 2.97 0.83 0.14 0.00 0.19 0.37 2.83 2.64 0.65 0.42'0.09 0.09 0.46 2.97 2.18 0.97 0.51 0.00 0.00 0. 23*2.78 1.67 0.83 0.46 0.05 0.05 0.28 2.41 1.90 1.21 0.79 0.00 0.19 0.32 3.06 1.99 1.44 0.32 0.46 1.81 4.08 36.60 30.06 17.07 9.93-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW M N NNW TOTAL 0.00 1.02 3.15 1.44 0.00 0.00 0.00 0.00 0.51 1.76 1.21 0.05 0.00 0.00 0.00 0.56 1.30 0.70 0.00 0.00 0.00 0.00 0.70 2.18 0.83 0.00 0.00 0.00 0.00 0.88 4.96 0.19 0.00 0.00 0.00 0.00 0.97 4.17 0.56 0.00 0.00 0.00 0.00 1.02 4.68 0.88 0.00 0.00 0.00 0.00 0.97 4.73 1.90 0.00 0.00 0.00 0.00 1.99 4.04 3.11 0.28 0,00 0.00 0.00 1.76 2.88 1.86 0.37 0.00 0.00 0.00 1.07 4.87 1.99 0.09 0.00 0.00 0.00 1.67 4.04 1.35 0,05 0,00 0.00 0.00 1.81 3.80 1.53 0.14 0.00 0.00 0.00 2.27 2.60 0.83 0.28 0.00 0.00 0.00 2.83 3.15 0.70 0.00 0.00 0.00 0.00 1.90 4.13 1..30 0.00 0.00 0.00 0.00 21.94 56.45 20.36 1.25 0.00 0.00-WINO SPEED CLASSES-.CA'LM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-900o I TABLE 10-20-Byron Generating Station 30 ft. Wind Speed and Direction October-December.

2008 250Ft-30Ft Delta-T (F)Number Of Observations

-2175 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNWTOTAL---------

STABILITY CLASSES ..........

EU MU SU N SS MS ES TOTAL SEU Mu C SU ,,A N ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 0.00 i MU 0.00 1 SU 0.00-N 0.05 3 S$ 0.14 MS 0.09 ES 0.18 I EU 0.00 MU 0.00 4 SU 0.18-N 0.87 7 SS 0.46 MS 0.23 ES 0.05 0.00 0.00 0.00 0.09 0.05 0.18 0.09 0.00 0.00 0.00 0.14 0.00 0.32 0.00 0.00 0.09 0.00 0.28 1.33 0.74 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.05 0.00 0.00 0.05 0.41 0.69 0.64 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.32 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.18 I EU MU 8 SU 1NSS ES 1 EU I NU 3 SU-N 1 SS ES 0.09 0.05 0.09 1.10 0.41 0.00 0.00 0.00 0.00 0.00 1.01 0.37 0.00 0.00 0.09 0.09 0.00 0.37 0.23 0.18 0.00 0.09 0.00 0.00 0.14 0.09 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00" 0.00 0.00 0.00 0.05 0.32 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.09 0.00 0.00 0.18 0.64 0.18 1.66 0.14 0.92 0.05 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.28 0.51 0.37 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.05 0.05 0.09 0.14 0.92 1.75 1.29 0.23 0.18 0.09 0.00 '0.05 0.00 0.05 0.09 0.46 0.87 0.92 0.51 0.00 0.00 0.05 1.29 1.33 0.92 0.00 0.00 0.00 0.00 0.69 1.20 0.14 0.06 0.00 0.00 0.05 0.78 1.61 0.51 0.09 0.00 0.00 0.09 2,30 1.61 0.32 0.00 0.00 0.00 0.00 1.24 1.06 0.18 0.00 0.00 0.00 0.09 0.28 1.24 0.23 0.05 0.00 0.00 0.05 1.56'1.79 0.00 0.00 0.00 0.00 0.00 0.78 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.23 0.23 0.00 0.00 0.00 0.00 0.69 0.83 0.14 0.05 0.00 0.00 0.05 1.10 0.51 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.14 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0;14 0.41 0.55 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.23 0.28 0.55 0.46 0.18 0.28 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.32 0.23 0.00 .0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.29 2.44 2.90 1.70 1.29 2.44 2.90 1.70 8.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.74 0.51 0.14 0.00 0.00 0.00 0.00 0.92 0.28 0.00 0.00 0.00 0.00 0.05 0.32 0.09 0.00 0.00 0.00 0.05 0.05 0.92 1.38 0.60 0.00 0.05 0.05 0.14 2.48 0.83 0.00 0.00 0.00 0.09 0.09 1.61 0.05 0.00 0.00 0.00 0.00 0.05 0.83 1.24 0.14 0.00 0.32 0.18 0.09 2.71" 0.55 0.00 0.00 0.00 0.00 0.00 1.10 0.05 0.00 0.00 0.05 0.00 0.09 1.43 1.47 0.05 0.00 0.09 0.05 0.14 2.71 0.78 0.00 0.00 0.00 0.00 0.00 0.74 0.23 0.00 0.00 0.00 0.00 0.09 1.52 1.33 0.09 0.00 0.00 0.00 0.05 2.99 0.18 0.00 0.00 0.00 0.00 0.00 1.89 0.05 0.00 0.00 0.23 0.23 0.37 0.78 10.71 15.26 5.66 1.84 0.69 0.69 0.41 0.97 22.62 10.76 1.61 0.05 0.00 0.00 0.14 0.14 11.59 3.72 0.32 0.00 0.37 0.78 10.71 15.26 5.66 1.84 34.85 0.00 0.00 0.00'0.41 0.97-22.62 10.76 1.61 0.05 37.10 0.00 0.05 0.00 1.06 0.00 0.00 0.00 0.00 0.00 0.00 0.51 0.05 0.00 0.00 0.14 0.14 11.59 3.72 0.32 0.00 15.91 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 I TABLE 10 continued-21-Byron Generating Station 30 ft. Wind Speed and Direction October-Decefber.

2008 25OFt-3OFt Delta-T (F)PEED ---------------------------------

r CLASS N NNE NE ENE E ESE WIND biRECTION CLASSES -.. .. ... ..------------------------

STABILITY CLASSES ----------

SE SSE S SSW -SW WSW W WNW NW NNW TOTAL EU MU SU N SS .S ES TOTAL I EU 1IMU 9. SU 2 SS 4 M E ES EU G5U N ES 0,00 0,00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.51 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.09 1.47 0.00 0.00 0.o0 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0o00 0.00 0.00 0.05 0.05 0.09 0.09 2.85 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.09 0.09 2.85 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 TOT 5.38 1.61 0.83 1.84 4.69 6.94 5.24 8.97 11.54 7.26 4.09 .3.40 11.31 8.83 9.10 8.97 100.00 0.97 1.01 1.98 49.20 32.78 10.48 3.59 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S 0.09 0.05 0.28 3.03 1.38 0.32 0.23 0.18 0.00 0.09. 0.00 0.00 0.05 0.83 0.37 0.32 0.37 0.18 0.00 0.00 0.05 0.05 0.00 0.00 0.74 0.78 0.23 0.05 0.05 0.09 0.00 1.01.2.07 1.15 0.32 0.05 0.18 0.09 2.39 2.62 1.24 0.37 0.00 0.05 0.18 2.67 1.06 0.74 0.55 0.00 0.05 0.14 2.62 3.54 2.02 0.60 0.00 0.00 0.14 4.87 4.87 1.33 0.32 SSW 0.00 0.00 0.14 2.90 3.72 0.28 0.23 SW WSW W WNW NW NNW TOTAL 0.00 0.00 0.05 2.07 1.56 0.37 0.05 0.00 0.00 0.05 2.11 1.01 0.23 0.00 0.09 0.28 0.37 6.76 2.67 1.15 0.00 0.32 0.18 0.14 5.20 2.11 0.60 0.28 0.14 0.05 0.23 5.10 3.03 0.23 0.32 0.00 0.00 0.14 6.53 1.66 0.41 0.23 0.97 1.01 1.98 49.20 32.78 10.48 3.59-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE HE ENE E ESE SE SSE 0.00 0.46 1.79 1.75 1.38 0.00 0.00 0.00 0.09 0.97 0.32 0.23 0.00 0.00 0.00 0.23 0.60 0.00 0.00 0.00 0.00 0.00 0.14 0.60 0.92 0.18 0.00 0.00 0.00 0.41 3.59 0.69 0.00 0.00 0.00 0.00 0.46 2.80 2.57 1.10 0.00 0.00 0.00 0.14 2.25 2.30 0.55 0.00 0.00 0.00 0.28 2.90 3.59 2.02 0.18 0.00 S 0.00 0.69 3.03 4.32 2.48 1.01 0.00 W WNW SSW SW WSW NW NKW TOTAL 0.00 0.32 1.89 3.40 1.38 0.28 0.00 0.00 0.51 1.70 1.66 0.23 0.00 0.00-WIND SPEED CLASSES-0.00 0.32 1.38 1.20 0.46 0.05 0.00 0.00 1.10 2.99 3.54 1.84 1.70 0.14 0.00 1.10 2.25 3.86 1.15 0.46 0.00 0.00 1.29 3.08 3.77 0.97 0.00'0.00 0.00 0.78 3.03 3.22 1.93 0.00 0.00 0.00 8.32 34.85 37.10 15.91 3.68 0.14 C A L'M< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph* 24.5 mph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 ITABLE 11-22-Byron Generating Station 30 ft. Wind Speed and Direction January-December.

2008 250Ft-30Ft Delta-T (F)Number of Observations

-8653 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE HE ENE E ESE SE SSE S SSW Sw WSW W WI4NW NW NNW TOTAL.........

STABILITY CLASSES ----------

EU MU ' SU N SS MS ES TOTAL SEU Mu C SU A N L S ES EU M SU-N 3 SS 4 SUN I7SS MS KES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.16 0.13 0.07 0.00 0.03 0.09 1.24 0.59 0.16 0.02 0.02 0.06 0.14 1.48 0.30 0.00* 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.12 0.02 0.01 0.02 0.03 0.01 0.87" 0.42 0.10 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.01 0.02 0.01 0.00 0.03 0.52 0.32 0.00 0.00 0:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.12 0.13 0.09 0.01 0.02 0.01 0.01 0.40 0.60 0.10 0.01 0.00 0.02 0.02 0.81 0.47 0.07 0.00 0.00 0.00 0.00 0.21 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.22 0.20 0.09 0.05 0.08 0.13 0.99 1.29 0.83 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.09 0.20 0.12 0.00 0.06 0.07 0.55 0.74 0.60 0.49 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.14 0.12 0.16 0.00 0.00 0.00 0.09 0.14 0.08 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.21 0.35 0.29 0.00 0.00 0.02 0.74 1.01 0.68 0.40 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.21 0.23 0.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 .0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.14 0.24 0.27 0.25 0.23 0.12 0.18 0.00 0.01 0.00 0.02 0.03 0110 0.89 0.74 0.91 0.88 0.58. 0.81 0.46 0.42 0.01 0.00 0.02 0.00 0.10 0.06 1.07 1.50 0.61

  • 1.44 0.18. 0.38 0.01 0.07 EU MU 8 SU-N I SS 2ES ES 0.02 0.00 0.00 0.74 0.18 0.03 0.00 0.00 0.02 0.02 0.23 0.03 0.00 0.00 0.00 0.00 0.01 0.44 0.15 0.00 0.00 0.00 0.00 0.00 0.24 0.03 0.00 0.00 0.01 0.01 0.08 0.61 0.37 0.01 0.00 0.00 0.00.0.00 0.14 0.03 0.00 0.00 0.01 0.03 0.05 0.79 0.76 0.12 0.02 0.00 0.02 0.01 0.46 0.14 0.00 0.00 0.00 0.02 0.12 1.84 1.44 0.14 0.01 0.00 0.00 0.01 1.11 0.84 0.07 0.00 0.00 0.01 0.03 0.52 0.88 0.39 0.14 0.01.0.02 0.05 0.94 1.01 0.05 0.01 0.00 0.01 0.00 0.57 0.43 0.00 0.00 0.01 0.03 0.07 1.07 1.38 0.23 0.03 0.00 0.12 0.10 1.11 0.62 0.00 0.00 0.00 0.00 0.00 0.35 0.12 0.00 0.00 0.00 0.00 0.10 1.06 1.03 0.12 0.00 0.01 0.05 0.12 1.25 0.35 0.00 0.00 0.02 0.03 0.05 0.45 0.07 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.30 0.39.0.50 0.28 0.00 0.01 0.15 1J33.1.23 0.36 0.01 0.07 0.10 0.21 1.87 0.37 0.00 0.00 0.07 0.05 0.07 1.21 0.15 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.34 0.46 0.52 0.30 0.00 0.01.0.09 1.03 0.99w 0.16 0.00 0.09 0.06 0.15 2.35 0.40 0.00 0.00 0.00 0.00 0.03 1.07 0.03 0.00 0.00 0.00 0.00.0.01 0.25 0.47 0.57 0.36 0.01 0.02 0.06 1.50 1.43 0.20 0.02 0.14 0.13 0.25 1.75 0.35 0.00 0.00 0.05 0.03 0.03 0.51 0.06 0.00 0.00 0.00 0.00 0.00 0.18 0.30 0.38 0.17 0.00 0.02 0.12 1.53 1.13 0.29 0.01 0.02 0.09 0.14 1.93 0.16 0.00 0.00 0.01 0.01 0.06 0.69 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 2.39 3.64 3.87 2.63 0.14 0.14 0.36 1.13 14.99 14.83 5.62 2.23 3.87 2.63 12,55 0.00 0.00 0.00 0.00 0.36 1.13 14.99 14.83 5.62 2.23 39.29 0.00 0.00 0.00 0.00 0.01 2.39 3.64 0.43 0.43 0.74 0.74 1.59 1.59 20.47 20.47 9.00 0.98 0.13 9.00 0.98 0.13 33.34 EU 0.00'1 MU 0.00 3 SU 0.03 N 0.49 I SS 0.09'8 MS. 0.00 ES 0.00 0.02 0.00 0.05 0.02 0.05 0.05 0.24 0.32 0.06 0.51 0.00 0.13 0.00 0.01 0.17 0.17 0.25 0.42 8.30 2.62 0.20 0.01 0.25 0.42.8.30 2.62 0.20 0.01 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 I TABLE 11 continued-23-Byron Generating Station 30 ft. Wind Speed and Direction SPEED ---------------........

WIND DIRECTION CLASSES -----------

CLASS N NNE NE ENE E ESE SE. SSE S SSW SW WSW January-December.

2008 250Ft-3OFt Delta-T (F)..............-.-------

STABILITY CLASSES ........W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL I EU 1MU 9SU ES EU IGMU T SU N 2 SS 4 MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.03 0.00. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.03 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.00 0.00 0.00 0.00 0.00 0.07 0.05 0.00 0.00 0.00 0.00 0.01 0.32 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.25 0.06 0.00 0.00 0.00 0.00 0.00 0.05 0.01 0.00 0.00 0.00 0.00 0.00 0.05 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02"0.01 0.01 0.16 0.00 0.00 0.00 0.01 0.01 0.00 0.01 0.00 0.00 0.00 0.01 0.02 0.16 0:67 0.01 0.00 0.00 0.00 0.01 0.03 0.07 0.00 0.00 0.00 0.00 0.01 0.02 0.21 0.00 0.00" 0.00 0.00 0.00 0.01 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.03 0.05 0.22 1.88 0.43 0.00 0.00 0.05 0.22 1.88 0.43 0.00 0.00 2.61 0.00 0.00 0,00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 .0.00 0.00 0.00 0.00 0.00 0:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01.0.02 0.02 0.05 0.13 0.02 0.00 0.00 0.05 0.13 0.02 0.00 0.00 0.23 TOT 5.25 3.04 2.03 3.18 5.58 5.45 5.86 .8.04 9.95 6.28 6.01 5.77 9.72 8.36 8.21 7.28 100.00 0.79 1.42 3.42 48.16 30.54 10.67 5.00 100.00 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.02 0.09 0.27 3.34 1.14 0.29 0.09 0.05 0.06 0.03 1.96 0,75 0.16 0.02 0.01 0.00 0.05 1.34 0.60 0.01 0.02 0.02 0.03 0.03 1.57 1.23 0.27 0.02 0.06 0.09 0.21 1.98 1.92 1.04 0.29 0.01 0.12 0.13 1.92 1.75 0.91 0.62 0.03 0.07 0.20 2.29 1.76 0.88 0.64 0.01 0.05 0.21 2.73 3.02 1.40 0.64 0.00 0.02 0.16 4.08 3.74 1.24 0.70 0.01 0.05 0.08 2.42 2.59 0.67 0.46 0.01 0.15 0.17 2.66 2.38 0.49 0.15 0.07 0.10 0.28 3.07 1.71 0.35 0.18 0.15 0.20 0.62 5.45 2.15 0.86 0.29 0.09 0.08 0.31 4.99 1.90 0.68 0.30 0.20 0.18 0.36 4.01 2.31 0.76 0.38 0.03 013 0.31 4.35 1.61 0.67 0.18 0.79 1.42 3.42 48.16 30.54 10.67 5.00-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE

  • ENE E ESE SE. SSE "S 5SW SW WW 'W WNW NW NNW TOTAL-WIND SPEED CLASSES-0.00 D o0.46 2.14 2.00 D,61 0.03 0.00 0.00 0.24 1.47 0.98 0.31 0.03 0.00 0.27 0.89 0.60 0.28 0.00 0.00 0.35 1.17 1.40 0.22 0.05 0.00 0.74 3.57 1.10 0.17 0.00 0.00 0.51 2.51 1.78 0.64 0.02 0.00 0.47 2.88 2.02 0.42 0.07 0.00 0.45 2.98 3.46 1.04.0.12 0.00 0.91 2.85 3.57 2.03 0.57 0.00 0.84 1.98 2.08 1.01 0.31 0.00 0.69 2.83 i.95 0.46 0.07 0.00 0.82 2.31 1.77 0.62 0.21 0.00 1.47 3.09 2.62 1,55 0.88 0.00 1.62 2.29.3.05 1.14 0.24 0.01 0.00 1.66 3.25 2.61 0.68 0.00 0.00 0.00 1.04 3.10 2.35 0.79 0.01 0.00 0.00 12.55 39.29 33.34 11.97 2.61 0.23 CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 Iph 18.6 -24.5 mph) 24.5 mph 0.00 0.00 0.00 '0.00 0.00 0.00 0.00 0.01 0.06 0.00 0.03 0.12 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo 5.5 Precipitation Monthly totals and the maximum 24-hour and maximum 1-hour precipitation amounts are summarized below. The month with the most measured precipitation was September*.

The month with the least measured precipitation was January. The maximum 24-hour total was 2.18" (September) and the maximum 1-hour total was 1.05" (July*).Table 12 Precipitation Totals (Inches) -2008 Byron Site Maximum Maximum Month Total 24-hour 1-hour January 0.55* 0.18* 0.10*February 2.31' 0.89* 0.20*March 0.99* 0.89* 0.34*April 4.69* 1.20* 0.29*May 3.21 1.30 0.53 June 4.50 1.32 0.50 July 6.05* 2.05* 1.05*August 2.09 1.13 0.82 September 6.60* 2.18* 0.49'October 1.89 0.69 0.24 November 1.60 0.40 0.19 December 4.48* 1.73' 0.37*TOTAL: 38.96*some data are missing -actual precipitation may be under-reported Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Mllinous 60067 (847) 963.9000 5.6 Doses Resulting from Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases.Unit 1: Dose gamma air (1)beta air (2)whole body (3)skin (4)organ (6) (teenager thyroid)Maximum Value 3.539 x 10- mrad 1.905 x 10- mrad 1.925 x 10-3 mrem 3.937 x 10' mrem 4.753 x I 0' mrem Sector Affected South-Southeast Northwest South-Southeast South-Southeast North-Northwest Unit 2: Dose gamma air beta air (2)whole body (3)skin (4)organ (6) (teenager thyroid)Maximum Value 1.048 x 104 mrad 4.328 x 104 mrad 5.769 x 10*5 mrem 2.563 x 104. mrem 9.040 x 104 mrem Sector Affected South-Southeast North-Northwest South-Southeast West-Northwest West-Northwest (1)(2)(3)(4)(5)Gamma Air Dose -Finite Cloud Model; M+T ODCM Rev. 9 Beta Air Dose -Finite Cloud Model; M+T ODCM Rev. 9 Whole Body Dose -Finite Cloud Model; M+T ODCM Rev. 9 Skin Dose -Finite Cloud Model; M+T ODCM Rev. 9 Inhalation and Food Pathways Dose -Finite Cloud Model; M+T ODCM Rev. 9 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo TABLE 13 Byron Station -Unit 1 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2008 FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER TYPE OF DOSE ANNUAL GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (itoero)ORGAN (itoero)CRITICAL PERSON CRITICAL ORGAN 4.000E-06(ESE) 1.650E-05(ESE) 1.960E-06( SE)6.120E-06( SE)2.180E-04(ESE) 1.480E-06( SE)6.710E-06(NNW) 9.180E-07( SE)2.800E-06( SE)1.0O9E-04(NNW) 3.530E-03(SSE) 1.880E-03( NW)1.920E-03(SSE) 3 .920E-O3(SSE) 1.240E-04( NW)3.OBOE-06(SSE)

I.990E-05(NNW) 1.61OE-06(SSE) 6.22DE-06(SSE) 8.020E-05(NNW) 3.537E-03(SSE) 1.899E-03( NW)1. 924E-03(SSE) 3.933E-03(SSE) 4.753E-04(NNW)

Teenager Thyroid Teenager Thyroid Teenager Liver Teenager Liver Teenager Thyroid COMPLIANCE STATUS TYPE OF DOSE Q GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN Calculation used re Unit 1 -Vent 10 CFR 50 APP. I 10 CFR 50 APP.I UARTERLY OBJECTIVE Z OF APP. I YEARLY OBJECTIVE

% OF APP. I 5.0 10.0 2.5 7.5 7.5 0.07 0.02 0.08 0.05 0.00 10.0 20.0 5.0 15.0 15.0 0.04 0.01 0.04 0.03 0.00 Teenager Thyroid Teenager Thyroid lease data from the following:

Date of calculation:

2/17/2009 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo TABLE 13 continued Byron Station -Unit 2 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2008 TYPE OF DOSE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER ANNUAL GAMMA AIR.(mrad)

BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN 1.560E-06(ESE) 6.840E-06(ESE) 1.350E-06( SE)3.120E-06( SE)2.280E-04(ESE) 9.810E-07( SE)5.530E-06(NNW) 1.110E-06( SE)2.620E-06( SE)2.550E-04(NNW) 4.970E-09(SSE) 2.720E-08( NW)2.330E-O9(SSE) 9.820E-09(SSE) 2.770E-04( NW)1.030E-04(SSE) 4.210E-04(NNW)

6. 580E-05(SSE) 2.540E-04(WNW) 2.420E-04(NNW)
1. 048E-04(SSE) 4.328E-04(NNW) 5.,769E-05(SSE)
2. 563E-04(WNW) 9.040E-04(NNW)

Teenager Thyroid Teenager Thyroid* Teenager Liver Teenager Thyroid Teenager Thyroid COMPLIANCE STATUS 10 CFR 50 APP. I 10 CFR 50 APP.I QUARTERLY OBJECTIVE 2 OF APP. I YEARLY OBJECTIVE TYPE OF DOSE GAMMA AIR (mrad)BETA AIR (mrad).WHOLE BODY (mrem)SKIN*(mrem)

ORGAN.(mrem)

CRITICAL PERSON CRITICAL ORGAN 5.0 10.0 2.5.7.5 7.5.0.00 0.00 0.00 0.00 0.00 10.0 20.0 5.0 15.0 15.0 I OF APP. I 0.00 0.00 0.00 0.00 0.01 Teenager Thyroid Teenager Liver Calculation used release data from the following:

Unit 2 -Vent Date of calculation:

2/17/2009 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 APPENDIX Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 Exeloi Contract Number 80633 Byron Meteorological Calibration F4 7107 R-25 Page 1 of 7 Date: 1, -POWER SUPPLIES+15.OOOV 1 0.150V A:+ iV* I0".. V B:+ '(4 y" V-1 5.OOOV 0.1 50V A:- 1, 0Z'-' V B:-14, 7> -V Signal Condiioners I Digital Recorder: Signal Conditioner Voltage Out Digital recorder Specifications AF AL AL EQUIV I PRCPLO I".00 V PRCP HI 5",of0 V-v ~ '-/oo 'AF 3 ft.0,.O " 1,L7O ALI'30 ft.WSZERO 0-015 0 _____V __mph ,. mph WS SPAN "I A9.5 .-. V 5, WO V 100. mph O. ,j mph' "ZERO ' _ 'V V -31L 0 0 o WDSPAN £o- v -- v 0.T LO .,0,"3 V V -1C),.'3 0 T HI 'Oq.v.j _ V V (it. (A 0 1LZ.,& 0 THI-LO V DPHI O U V V, a DP HIVI. t- a _, S i DP HI-LO V-.mph mph-0* 0-" o-0-1 0 Signal Cond.0.OOOV +/- 0.050V 5.OOOV +/- 0.050V 0.015V +/- 0.025V 5.OOOV +/- 0.025V 0.000V + 0.100V 5.OOOV +/- 0.100V 5.OOOV +/- 0.050V 5.OOOV +/- 0.050V 0.015V +/- 0.025V 5.OOOV +/- 0.025V 0.000V + 0.100V 5.OOOV +/- 0.100V 5.OOOV +/- 0.200V Recorder AL EQUIV +/- 0.01" AL EQUIV +/- 0.01" AL EQUIV +/- 0.1mph AL EQUIV +/- 0.1mph AL EQUIV 10 AL EQUIV+ 1 AL EQUIV 1 0.1OF AL EQUIV +/- 0.1 0 F AL EQUIV 1 0.1OF AL EQUIV + 0.1°F 250 f t.WSZER0.OI -VV V __V ---b mph O, mph. -mph WSSPAN 23 V -V CCo., mph /00,0 mph ,- mph WDZEROOtO

_ V V _,oV 1 0 WDSPAN J0 _____V 5V IVS o4 o -a ATLO "ooý V _ _q,q(0_o -7.¶t ° °ATHI Li 98 V V A..- q.q9 7. -0 ATHI-LO 4.-" 1 V_ V AL EQUIV 1 0.1mph AL EQUIV 1 0.1mph AL EQUIV +/- 10 AL EQUIV +/-10 AL EQUIV +/- 0.1OF AL EQUIV +/- 0.1°F Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A -Palatine, Illinois .60067 1 (847) 963-9ooo Exelon Contract Number 80633 Byron Meteorological Calibration F5 7/07 R-25 Page 2 of 7 a Date:0,037Dae TOWER MEASUREMENTS

~Ambient 5 lce Bath A,. -L-OS Temperatures 30 ft. Amb. 250 ft. A T*AF AL AF AL Measured -I -,_,F °OF 0 F.% O _Recorded _OF --a,..°F°Difference

! °F _OF 0J.0 F a Specification

+/-0.5°F +/-0.18°F Winds F F F 30 ft. dew point_AF AL-F 5 6.- F'-% .0 OF°F __---_:12.7°F WS stall Forw. WD Revr. WD 30 ft.AF AL O-4 mph mph Q2-.-0 250 ft.AF AL mph 0%q mph° a0 Specification 0.3mph +/- 0.45mph 300/3900 +/- 50 2100 +/- 50 Tracking/wear Comments:

WO Vi 1, .MILOI/ ýr,54~l 1 I Q a50' wrm(.rojt ev&if)M~ooq o1YsrGA1 R-- (JP#(T04 Murray & Trettel, Inc.. 600 First Bank Drive, Suite A .Palatine, Illinois..

60067 2 (847)63-9ooo Byron Meteorological Calibration I-b 7/07 R-25 Page 3 of 7 Date: [7o Dates of Last Wind Sensor Bearing Replacements:

30 ft.(6 mos.) Wind Speed: U o7 (12 mos.) Wind Direction:

-250 ft.-'7-c~q 30 ft. 250 ft.Aspirators:

__: Operation of De-ice Heat Lamp System (Aug-Mar):

Operation of Rain Gauge: Debris screen: In Ou) Installed Removed Tower Liohtina Good- Fair Poor Tower Condition Good Fair Poor Beacon '] 0 E] Paint 1: 0 0 Side lights J E 0 Guy wire tension D Wiring Q 00 Flasher U 0 0 Shelter condition 0 Note: Calibration Instruments:

AF = As Found Psychrometer

-S/N -AL = As Left Digital multimeter

-S/N -!_-7q Mog0--no change (AF=AL) Digital multimeter

-SIN -FS = Full Scale rechnicians:

Mxt .,x , ArL L-L _._, Comments: Signature:

__(84_)___3-9ooo Murray & Trettel, Inc. 6oo First Bank Drive, Suite A -Palatine, Illinois -60067 2 (847) 963-9000 Mon Wmrac =oinMoAm3 M M " 7 R System Response Check Page- 4 Date' l c" Site: Byron System: Microtel Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected t0.4 +/-0_4 +/-2 ;t t2 4). +/-0.5 Oca +/-0.18 .0.5 Response _0.4 ..4:_2.0.,...

As Found 0 q .,b Response I'?q Lfjj _7" AS Left -...Response Murray & Trettel, Inc.

  • 60o First Bank Drive, Suite A .Palatine, Illinois .6o067 9 (847) 963-90o0 Sm -m m m Bon 7 R Page 5c System Response Check Date:/ "-.Site: Byron System: Process Computer -Y4000 -Y4006 Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30 DP 250' WD 250' WS Expected Response *2 +/-0.4 10-7.o *0.5 90 *0.18 107. (o *0.5 k4 .G +/-2 elO.0 +/-0.4 As Found* oI17~ ~ ~.AsFudResponse

_4 III0-7 ,b 1, V.O7. r- CO.As Left Response ....Murray & Trettel, Inc. -60o First Bank Drive, Suite A .Palatine, Illinois -6oo67!3 (847) 963-9000 W~onkU~raWu11cLuOD.M System Response Check Page 6 Date:' 17 O Site: Byron System: Process Computer -Y4011 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected ...Response +0,0 _+ 02 1-_ L) , 0.4 4 +/-2 -"., , 0.5 " +/- +/-0.18 " G'C- +/-0.5

  • O * +/-0.01 As Found 5 .'O-Response 0 .*r;) i,-.,, As Left .._Response Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation REponse, qO.O +/-0.4 +/-2 (q' 0 +/-0.4 +/- ,2 107.G+/-0.5 .O +/-0.18 IOJ.(C.9.5., +/-0.01 As Found As Left ..Response " Murray & Trettel, Inc.
  • 6oo First Bank Drive, Suite A .Palatine, Illinois.

6o067 2 (847) 963-9oo0

--!NIon uow 7F R.Page 7c System Response Check Date: A Site: Byron System: Control Room Indicators Mid Scale 30' WS° 250' WS 30' WD 250' WD 30' T 250' tAT 30' DP Check _______ ______________

_ _ _ _ _ _Expected Response 50. +/-1.0 X?(1.2 +/-55 S.O +/-5.." :0.5 Q-.O +/-0.18 50. .0.5 As Found Response 5SO _____. _ 2-"______

5b. _- .-,, As Left _ -...- .Response ....e;W6 Murray & Trettel, Inc. -6oo First Bank Drive, SuiteA .Palatine, Illinois .6oo67 W (847) 963-9o00 Exelon Contract Number 80633 4" Byron Meteorological Calibration i Page 1 of 8 Date: LI-QS POWER SUPPLIES+12.OOOV

  • 2.OOOV+ i3. 4e V NolC --Data Logger System Check: Expected 30' S. 0.3 mph 11.71 mph.23.12 mph 45.93 mph 91.57 mph Data Loaaer L) 1 mph LI.76 mph;15. F-2-mph t15¶, 9!5mph E.____ mph 0.,30 mph i'h, " mph mph mph mph Specifications

+/- 0.4 mph+1- 0.4 mph+/- 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+/- 0.4 mph+1- 0.4 mph Expected 30'WD 00 900 1800 270°360" 250' WD 00 900 180" 270°3600 Data Logger 00 90.-3, 35q. to O,3V.9o,f 0 Specifications

+/- 20+/- 2+/- 2+/- 2+/- 2 250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph+/- 2+/.20+/- 20+/.-20+/- 20 T Lo 30' TEMP 250' TEMP A TMid 250"-30'TiHI 30' TEMP 250' TEMP A TMId 250'-30'30' TEMP 250' TEMP'ATLo 250'-30'30' TEMP 250' TEMP ATHI 250'-30'Ohms 40.670 40.670 12.174 12.174 Exnected 23.09F 23.0OF 0.0 0 F 100.0 0 F I 00.0 0 F 0.0 0 F Data Logger-2z'95.;L2.Ae 0 0 .0, 0 09. (, O ,b\0 Soecifications

+/-0.10+/- 0.10+/-0.10+/- 0.10+/- 0.10+/-0.10 34.890 40.670 40.670 34.890 32.0 0 F 23.0 0 F-9.OOF 23.0OF 32.0 0 F 9,07 0 2z, qq 0 ,3.4 0+/- 0.10+1/ 0.10+1- 0.10+/-0.10+/- 0.10+/- 0.10 ASL 5-30.'o Murray & Trettel, Inc.

  • 600 First Bank Drive, SuiteA .Palatine, Illinois.

60067 a (847) 963-9000 Exelon Contract Number 80633 5 Byron Meteorological Calibration Page 2 of 8 Date: -09 30' Ambient.AF AL Measured O'2,OF °Recorded F ..-- OF Difference

,-10 OF , F Specification

+0.5 0 F 30'AF AL WS stall 0.?,. __mph -mpp Forw. WD 09 -1 o Revr.WD C.Io0 _-- 0 Tracking/wear O K TOWER MEASUREMENTS 0] Ambient t Ice Bath Temperatures 250' A T AF ALF A.OL F 0'.( "F -°F (1.00 °F °F*-0. 180F Wind..ss 250'ýAF AL 1 03._. mph _..._..mph-S1 --°0Q9 -°+/-0.8 0 30' Dew Point AF AL S3. 0 oF ' F" -5 OF ,F0 0 -6 OF OF*2.70F Specification 0.3mph +/- 0.45mph 300/3900

  • 50 2100
  • 50 Comments: AZL S-3,-o8 Murray & Trettel, Inc. 600 F'rst Bank Drive, Suite A .Palatine, Illinois.

60067 3 (847) 963-9ooo 6 Byron Meteorological Calibration Page 3 of 8 I Date: t4-9 -049 Dates of Last Wind Sensor Bearing Replacements:

(6 mos.) Wind Speed: (12 mos.) Wind Direction:

30'LI/os 4I/0g 250'q1 30'Aspirators:

OK Operation of Rain Gauge: OK.250'OK uuurlS iluvii. iii rlIUVVWU 3 Tower Lightina Good Fair Poor Tower Condition Good Fair Poor Beacon "/ 0 0 Paint ,.f 0 0* Side lights i"] 0 0 Guy wire tension El E' E0 Wiring 0 0 r0 Flasher 0 El Shelter condition Note: AF =AL =As Found As Left no change (AF=AL)Calibration Instruments:

Psychrometer

-SIN --L Digital multimeter

-S/N -l I Digital multimeter

-S/N -_FS = Full Scale I'echnicians:

We-6 A LJ rl .A r/ .~f M~~ankt1~i Comments: Signature:

d A-"L S-30ogo Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, Illinois .6oo67 2 (847) 963-9ooo

~ -in-- -Page 4 of System Response Check Site: Byron System: Digital Recorder Low Scale CH 1+/-0.4 CH2 11 CH3*0.4 CH4 +1 CH5 tO.4 CH6 +/-0.18 CH7 *0.4 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' &T 30' DP Precip Vo.t 0.005. V OOOS v 0,0oo v 00oo v O.ooq V 0,00o v 0.00'4 v O,o~ov Expected 0.1 MPH (),!5 DEG 0"0 MPH ' DEG )..8DEG -10 DEG -)).8 DEG IN Response ____ 0-. L EGDG0VI_____. O.__ 1 0.0 O ~ p~ 40I.0 -1.g7 c.oo Response __00_,_1___

,;__6_(As Left Response --" Mid Scale CH 1+/-0.4 CH2*1 CH3 +/-0.4 CH4 *1 CH5 *0.4 CH6+/-0.18 CH7 +/-0.4 CH8 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP .Precip Volts S-5o-7 V ,.So7 V -W`196 V A..9 V ..5o-7 v D.Yqqg V ,,.So7 V 9.qqg7 V Response 5O.Iq MPH 'n0. DEG 'p'¢- MPH , DEG SO.,, DEG DEG 1 DEGDE IN*ResponseDE

'5 As Found pIrn£fi1 'ia..fI Oj Response "-0'-01 !&0. 1' b(Y OJ J As Left Response -Full Scale CH 1+/-0.4 CH2.+/-1 CH3 *0.4 CH4+/-1 CH5+0.4 CH610.18 CH7 t0.4 CH8+/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip volts 9.otI v F013 V iq q.3 v ..z v .!7 V S.o01 v q.yqs v Expected 100.A MPH S.Lj DEG ffA MPH DEG. U1,3 DEG qqq DEG JX,ý DEG ). 00 IN AsFound q aor3 0a)Response iOO.-. '-qI/ 571.9 _____ I~ d. .0 I%As Left I Response Murray & Trettel, Inc. -6oo First Bank Drive, Suite A .Palatine, Ilinois .6o067 2 (847) 963-9oo0 System Response Check Page 5 Date: __-_____Site: Byron System: Data Logger SMidScl.Mieca 30' WS 30' WD 250' WS 250' WD 250' T 250' AT 30' DP.Check _______ __Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270+/-2 50.0 +/-0.5 0.0 +/-0.18 50.0 +/-0.5 Response As Found Response 56(J ;Do .90- SO.0 As Left Response --Full Scale WS 10m WD 60m WS 60m WD 10m T 60m AT 10m DP Check Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.0 +/-0.5 10.0 +/-0.18 122.0 +/-0.5 Response As Found b* 1.Response 0 As Left ... ._Response Murray & Trettel, Inc.. 6oo First Bank Drive, Suite A .Palatine, Illinois .60067 2 (847) 963-9ooo System Response Check Page 6 of Date: q4q. 0 g Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected Response .:2 .0.4 -j1.g +0.5 -.-0-o +/-0.18 +/-0.5 C) t2 %C) +/--0.4 As Found Response -_____0_o As Left Response "_ _ _ _ _ _-"_....Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30'WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 2 S2 +/-0.4 So. a +/-0.5 +/--0.01 +/-0.18 .+/-0.5 ' .6. t2 to/C 04 Response .As Found -qj2'-Res onse S.0 Z)LJ.3 -o.6o0 .q.5 As Left Response _-- -Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected s )q +/- o.) 04+/-. ~+/-.8:O5S l a -2 q .E Response +/-0.4 As FoundS3q Response As Left :- -Response F T_7_T ,A32 5.-3c.01 Murray & Trettel, Inc. -6oo First Bank Drive, Suite A .Palatine, Illinois .6oo67 a (847) 963-9000 P 7 o -in.. , n System Response Check Page 7 Date: og Site: Byron -System: Process Computer -Y4011 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response 0.1 0.4 0.Sq +/-2 0.0 +/-0.4 0 +/-2 -I.% +/-0.5 -16 +/-0.18 +/-G. +/-0.50.0 +/-0.01 As Found -IU.U Response 0.0____0__

._-_--O_,._

As Left --'Response " "" Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected +/-0.4 2-7.'S +/-2 +0,j +/-0.4 ;?6L g2 Response +/-2J +;.O,),+/-0.5

...0.010.18 50A +/-o.5 0.- o:0.0 As Found 7 q o Response 50-. ;7.0 _ _.'7 .-0_ .7 ..so As Left -__,-Response Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected IOOý+/-0.4 91. +/-2 +/-0.4 *+/-2 133+/-0. 5 .qj :0.18 Response W0.-I045lq

+2qq l +. +

+/-O-5 I.00 t0.01 As Found 'q A Response __ _. _As Left Response 1 00"/V "__Aa -o3 Murray & Trettel, Inc. -6oo First Bank Drive, Suite A .Palatine, Illinois .60067 2 (847) 963-9000 Page 8 of System Response Check Date: 0-,-Site: Byron D System: Control Room Indicators Murray & Trettel, Inc.. 6oo First Bank Drive, Suite A -Palatine, Illinois.

60067 2(847) 963-9000 Exelon Contract Number 80633 4* Byron Meteorological Calibration Page 1 of 8 I Date: .,- POWER SUPPLIES+12.OOOV i 2.000V S;5,i'7O v Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Looaer 0O;11 mph 11. 7(U mph ,~.~..- mph mph_mph___ "_mph__ _- _ mphmph mph Specifications

+/- 0.4 mph+1- 0.4 mph+/- 0.4 mph+/- 0.4 mph+1- 0.4 mph+i- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1. 0.4 mph Expected 30'WD 0°900 1800 2700 3600 250'WD 00 900 1800 2700 3600 Data Loaoe 17 01 27~'4-Specifications

+1- 20+1- 2°+/- 2°+/- 20+1- 20 250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph+1- 2+1- 2°+/- 2°+/- 20+/- 20 T Lo 30' TEMP 250' TEMP A TMid 250'-30'T HI 30' TEMP 250' TEMP A TMid 250'-30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP250'-30'Ohms 40.670.40.670 12.174 12.174 Expected 23.00F 23.0°F 0.OF I00.O°F 100.00F O.OF Data Loaoer'L2" J'ý0~q.j%0q.q Specifications

+/-0.10'+/- 0.10+/- 0.10+/" 0.10 41- 0.10+1- 0.10 34.890 40.670 40.670 34.890 32.OOF 23.0*F-9.0 0 F 23.0OF 32.0"F 9.0 0 F 0 .T.0,3.00 9. tfl 81, qeq 0+/- 0.10+/-0.14+/ 0.10+/" 0.10+A- 0.10+/- 0.10 Murray & Trettel, Inc.

  • 600 First Bank Drive, Suite A. Palatine, Illinois .60o67 2 (847) 963-9000 Exelon Contract Number 80633 5 Byron Meteorological Calibration Page 2 of 8 Date: -11 A Measured Recorded Difference Specification 30' Ambient.AF AL-O__F Aro -oF+0.5 0 F TOWER MEASUREMENTS Ambient d Ice Bath Temoeratures 250' A T AF AL°F -- OF.1 OF --F.°F -.F t0.18°F 30' Dew Point AF AL,0F -" OF.F OF tP2.7°F 30'AF AL WS stall 0-.& mph ..mph Forw. WD 3.'j00 Revr. WD 2A 8.B1. -Tracking/wear C/Winds 60'AF AL___mph 0 -" oZ)S ° --Specification 0.3mph + 0.45mph 300/3900
  • 50 2100 +/- 50 Comments: Murray & Trettel, Inc.
  • 600 First Bank Drive, Suite A .Palatine, Illinois.

60067 2 (847) 963-9ooo 6 Byron Meteorological Calibration Page 3 of 8 Date: 1, Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 mos.) Wind Speed: _ __. +/- -O?(12 mos.) Wind Direction:

_ _" ____L_,__30'250'Aspirators:

Operation of Rain Gauge: b1-Debris screen: rn ) Out Installed Tower Lightino Good Fair Poor Toe Latn0Go'Fi oor Removed Beacon Side lights Wiring Flasher~oo~oo Tower Condition Paint Guy wire tension Shelter condition Good Fair Poor a~o a f4 ,Ov *Er 6e oA*!Note: AF =AL =As Found As Left no change (AF=AL)Calibration Instruments:

Psychrometer-SIN -Digital multimeter

-SIN -Digital multimeter

-SIN -FS = Full Scale lechnicians: , I '. ., _ _ __[_ _I Comments: I-I 4 4$L Signature:

Murray & Trettel, Inc.

  • 600 First Bank Drive, SuiteA .Palatine, Illinois .60067 2 (847) 963-9ooo

-m m -m ------ -.. -m -Page 4 of System Response Check a Date:- " 'Site: Byron System: Digital Recorder Low Scale CH 1*0.4 CH2 *1 CH3+/-0.4 CH4 +1 CH5 D0.4 CH6 *0.18 CH7 +/-0.4 CH8 *D.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts -0 VVO V O.-OV V 0.00 V 6.000 V -O.oo0( V OCý) V Oo)6 V o.,)o, V Expected I:L) MPH ._ DEG 0.0 MPH C> DEG DEG D. DEG c.o IN Response.As Found z , =&* Z'63 0-00 Response '0......As Left ---Response _ _...Mid Scale CH 1+/-0.4 CH2 +/-1 CH3 +/-0.4 CH4 +/-1 CH5 +/-0.4 CHB +/-0.18 CH7 +/-0.4 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts ZLCjC7 v 2;,) VV; vZ4.O v z..q-i v z v iLq9 v ".-qe v -..v Expected M' MPH ,- DEG -ýO MPH 2,.7 DEG DEG 00:jo DEG .JDEG ,4, IN Response -qq DEG 44l IN As Found Response L--i7 -"________

______- _As Left Response Full Scale CH 10.4 CH2 *1 CH3 +/-0.4 CH4 +1 CH5 +/-0.4 CH6 *0.18 CH7 +/-0.4 CH8 *0.01 Check 30' WS 30' WD 250' WS 250' WD 30'T 250' AT 30' DP Precip Volts , V GIOO V IM4,'1 V 14,61L% V [1.01 V 1f,1,1 v ,., V -V eoExpected~

,- MPH DF:G .0D- MPH

  • .IDEG DEG DEG IN Response 1 " ."__As Found if~Response g,.I As Left _ --Response Murray & Trettel, Inc. -600 First Bank Drive, Suite A .Palatine, Illinois -60067 2 (847) 963"9000 System Response.

Check Page 5 of Site: Byron System: Data Logger Low Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Check Expected 0.0 +/-0.4 0+/-2 0.0 +/-0.4 0 +/-2 -22.0 +/-0.5 -10.0 +/-0.18 -22.0 +/-0.5 +/-0.01 Response ..As Found "-.ze)Response -. 0 ,." As Left J Response ,, Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250' AT 30' DP Check Expected 50.0 +/-0.4 270:+/-2 50.0 +/-0.4 270:+/-2 50.0 +/-0.5 0.0 +/-0.18 50.0 +/-0.5 Response _____As Found Response 0" .-.7.L 201) X, (),OO As Left --- -Response Date: 5 -f-&0 Murray & Trettel, Inc. -6oo First Bank Drive, Suite A .Palatine, Illinois .60067 9 (847) 963-9000

ml--- -l- i-- -l- l -Page 6 of System Response Check Date:____________

Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected Response 02 c +/-0.4 '2,.&0+0.5 -IO.o +0.1 8 --l-:P +0.5 +2 ) +0.4 As Found Response _._ _-"- 2 .- -0.4L -., Z As Left -.Response _.Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected Response /1 0 +2 .5'O +/-0.4 S ".67 +0.5 -+/-0.18 +/-'.o +0.5 +/-7 0 +/-2 .+0.4 As Found LI CI u -q01 Response I -o0Iai, .6t( As Left .""-Response ..Full Scale Y4000 Y4001 Y4002 -Y4003 Y4004 Y4005 -Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 5 4-4 0 +/-2 /i:0,0+/-0.4

J.z..Q+/-0.5 ) +/-0.18 /ZZ.t.O +/-0.5 +/-L(C +/-2 ti"P6.6+/-0.4 Response ",. ...As Found Response _ _ _ 0 ( _As Left .- ..Response ....Murray & Trettel, Inc.
  • 600 First Bank Drive, Suite A .Palatine, Illinois .60067 W (847) 963-9ooo m m- ------m ---m---m- -- ---m Page 7 of system Response Check Date: NO" Site: Byron System: Process Computer -Y4011 -Y401 9 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected /. *0.4 * .2 .+/-0.4 e +2 12._7.Ot00.5

-/0.0 *0.18 -"L"C.0,0.5 P.00 *0.01 Response ______As Found Res ponse 7 0k*fJ -j .J 9E7.As Left Response Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 " Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response +/-0.4 -7O +/-2 iJZ. +/-0.4 ;L-7C +/-2 5V-. +/-0.5 O.0 +/-0.18 .0"0 +/-0.5 *57V +/-0.01 As Found A Res ;ponse 1j.( (0 L' ~ 0v As Left .._ ...-Response .Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response o~/ .0+/-0.4 5-"JCl +/-2 /00 X +/-0.4 51-10 ,2 ?cZ.O,0.5 I., .3 +/-0.18 /+/-.2.0.5 / +/-0.01 As Found f7 Response T934 -r ofl 2-__ ____ __ _ ___ 7 ___ _As Left ..- -.-. -- -Response Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, Illinois .60o67 9 (847) 963-9ooo m m -m --m m -i.-Il--.in 8- o I~t. --L- -- ... ... hL __,_Page 8 of System Ries onse Cneck Date: ý .n Site: Byron System: Control Room Indicators Low Scale Check 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Expected Response * *1.0 0 *1.2 05 +5 +5 -Z 7-_ *0.5 J- +/-3.O +/-0.18 -7 ."1 0.5 As Found Response 0__As Left ---Response Murray & Trettel, Inc. .600 First Bank Drive, Suite A -Palatine, Illinois.

60067 9 (847) 963-9o00 Exelon Contract Number 80633 F4 R-26 6/08 Byron Meteorological Calibration Page 1 of 8 Date: 9-q'-oe POWER SUPPLIES+12.OOOV +/- 2.OOOV+ V3.57 v Data Logger System Check: Expected 30'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Logger 0. 30 mph______mph 23,1i, mphg3 mph.O mph 11,7(, mph_3,!t- mph_.L3 J3 mph IL. _!r& mph Specifications

+h 0.4 mph+1 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph Expected 30'WD 00 900 1800 2700 3600 250' WD 00 900 1800.2700 3600 Data Logaer 180u, 0 359,74 0 Specifications

+1- 2+1- 2"+/. 20+1- 2 250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph+/- 20+1420+/- 2+4- 20 T Lo 30' TEMP 250' TEMP A TMId 250'-30'T Hi 30' TEMP 250' TEMP A TMId 250'-30'30' TEMP 250' TEMP ATLo 250'"30'30' TEMP 250' TEMP ATHi. 250'-30'Ohms 40,670 40.670 12.174 12.174 34.890 40.670 Expected 23.0"F 23.0 0 F 0.0°F 100.00F 100.0°F 0.0"F 32.0°F 23.0"F-9.00F Data Loager Z-Z.15- 0-.91.91 0 qq.q7 0 3t.qq zz'.0 0-9.04 Specifications

+1- 0.10+/- 0.10+/- 0.10+/-0.10+/-.0.10+1- 0.10+1- 0.10+1- 0.1°+1- 0.1'40.670 34.890 2108F 32.0 0 F 9.0 0 F+/- 0.10+/- 0.1+1- 0.10&to-o Murray & Trettel, Inc.

  • 600 First Bank Drive, Suite A .Palatine, Illinois .6oo672it (847) 963-9ooo Exelon Contract Number 80633 F5 R-26 6/08 Byron Meteorological Calibration Page 2 of 8 Date: "'-O0 30' Ambient.AF AL Measured 3Z.00 F -- F Recorded V1,93 OF -OF Difference

.O" oF _-"_0 F Specification

+0.5 0 F TOWER MEASUREMENTS

[o]Ambient (3 Ice Bath Temperatures 250' A T AF AL ,1O OF -OF.11 OF "- OF.01 OF OF+0.18°F 30' Dew Point AF AL0 F -- F" oF.I~ 0 F -F;t2.7 0 F 30'AF AL WS stall 0.3 mph 0.3 mph Forw. WD 0 0 -0 Revr. WD Z o -Tracking/wear o0.Winds 250'AF AL o.04 mph 0.3 mph-. 0.20o9.16 2 0f Specification 0.3mph

  • 0.45mph 300/3900 +/- 50 2100*50 I.Comments: a T e 6i Vt ai 0 ( A963-9000 Murray & Trettel, Inc.
  • 600 First Bank Drive, Suite A .Pal, t'e, 171inois.-

6o067 2 (847) 963-gooo Q.AC.Lul %..UA&U4LV6 " .'ULtusJ" O01U3 3 F6 R-26 6/08 Byron Meteorological Calibration Page 3 of 8 Date: q-S-OB Dates of Last Wind Sensor Bearing Replacements:

3 30' 250'(6 mos.) Wind Speed: q-e I (12 mos.) Wind Direction: " _ D_6 4. 0?_ _1 30' 250'Aspirators:

V_ 0-Operation of Rain Gauge: QY Debris screen: Doo Out Installed Removed i Tower Liahting -ood Fair Poor Tower Condition Good Fair Poor Beacon [9 0. 0 Paint 0 0 0 E Side lights to 0 0 1- Guy wire tension t 0-Wiring I/ 0 0 V " I Flasher 0 0 Shelter condition ED 0 0 Note: Calibration Instruments:

AF = As Found Psychrometer

-S/N -0, AL = As Left Digital multimeter

-SIN -1962,,1,0011 I -=- no change (AF=AL) Digital multimeter

-SIN -FS = Full Scale echnicians:

t/1 ,'io."h'4 ,kk m4o rwf4e',. , I Comments: I I I Signature:

Murray & Trettel, Inc.

  • 600 First Bank Drive, Suite A -Palatine, Illinois .60067 3 (847) 963-9ooo.

-m m -m- -m- m R PageA c System R~esonse ci'nwi Date: 9 --)8 Site: Byron.System: Digital Recorder Low cle CH 1*0.4 CH2*1 CHM3W4 CH4*1 CH5 +/-0.4 CHO *0.18 CH7 +/-0.4 CH0 80.01 W30 WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts ,VeV .V 0.LcD V V V O.COxZ V V V -OZol V .V Expectd Response 0. 0 MPH 0 DEG-,ot MPH--o DEG -z a.aDEG lb.vo DEG -&.O'5 DEG .O 0 IN As Found CD Response o)As Left Response "-'- "- _ " _--_"____Mid Scale CH lU0.4 CH2*1 CH3A13.4 CH4*1 CH5*0.4 CHO 0 0.18 a CH7 0.4 .CO 8*0.01 30' WS 30' VD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts '.-tqq' v 2.5w v 2.498 v ;.49g v 2.'(qq v Z. 5bo v 2.,jqq v ;g.,-49 v Response q.q MPH aO DEG MPH .1, DEG DEG DEG 'q.q"j DEG .IN As Found "qq, Response LA v.)o ____ ?%7b 1 -O.0oI IR, q_-_" AS Left Response Fut "C4,e10C 0.4 0" "H12*1 CH3 tO.4 0114*1 CH5 2OA.4 O' +/-0.18 011*O. 0118+/-0.01 30' WS 30' WO 250' WS 250' WD 30' T 250' AT 30' IDP Precip volts '?,7o v , v S-.> v -.' v', V V V Sc;0 v Response JDO MPH .,q. DEG 'oo MPH SLIO DEG ( DEG to., DEG (27.0 DEG 1. D, IN As Found Response 9____ 5-H o qq.q SLqO. ).j 13 ,99 L*~3 ;o As Left ---Response Murray & Trettel, Inc. -6oo First Bank Drive, Suite A -Palatine, Illinois .60067 2 (847) 963-9000 ljz-i- 10-10-03 Sm -m ---m ((R-6/1 System Response Check Page 5 o Date:, q" Site: Byron',stem: Data Logger Mid Sca 30' WS 30' WD 250' WS 250' WD

  • 250' T 250' AT 30' DP Check Expected 50.0,0.4 270 *2 50.0 *0.4 270,2 50.0 .0.5 0.0,0.18 50.0 +/-0.5 Response .________________

As Found Response 5D _DL._ b___ 5D. 0O 210.-W 0.0. bo As Left Response I Ful c Ol m WS 10m WD 6om WS 60m WD 10m T 60m AT 10m DP Expecte Response 100.0,_0.4 5402 100.0,0.4 540 *2 122.0 *0.5 10.0,0.18 122.0 *0.5 As Found Response IC.Ib 5'O J.)O6O 5 ID 0 T4 12-zIr3b As Left .-* .-- ..Responee _0_L 10-10-08 Murray & Trettel, Inc.* 6oo First Bank Driue, Suite A Palatine, Illinois.

6oo67 3 (847) 963-9ooo ImJ m N --I- --llII f (Page 60 System Response Check Date:_______o Site: Byron 3ystem: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T. 250' tAT 30 DP 250Y WD 250' WS Expected Response 0 2 ,o +/-0.4 , +0.5 *0.18 -zz, +/-0.5 o +2 6.C +/-0.4 As Found Response 2.. _2* .() -CZ,>. b -z C> ".As Left Response -Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 30'VWD 30' WS -30'T 250'AT 30'DP 250'WD 25(Y WS Expected Response ) +/-2 +/-0.4 +/-0.5 O, -0.18 +/-0.5 27> +/-2 +/-0.4 As Found ,,, Response ___.__ ___ __ __cI__6__er As Left ... -Response -. -M & eBa 08o Murray & 71rettel, Inc. -"6oo First Bank Drive, Suite A -Paltine, Illinis.-

6o067 9 (847) 963-9000 m n Rm m -m m RImm" ( (R-Page 7 System Response Check Date:_~Site: Byron 3ystem: Process Computer -Y4011 -Y401 9 Low Scafe Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WO 250' WS 250' WD 30'T 250' LiT 30' DP Precipitation Response d +/-0.4 02 + 1 ,) *0.4 C) +/-2 --.2.,L -,. -2.6~ +/-0.5 .0O *0.01 As Found --Q e Response 7-Z.. L____ ______As Left Response o.rI -1 "" _-" _---AYTL to-w-oa Murray & Trettel, Inc. 6oo First Bank Drive, SuiteA -Palatine, Illinois 60067 I (847) 963-9000 Sm omm m M M -M M M M I./(.F Page 8 System Response Check Date: _ _ _ _ _ _Site: Byron System: Control Room Indicators Low Scale 30'WS 250'W30' WD 250' WD 30' T 250' AT 30' DP Check Expected 1.0 .o 01.2 5 *5 Z2.,0 0.5 .0.18 -2 .0 +/-0.5 Response )C_______________

I)0 As Found 0 Z2 -Response, As Left Responsem_

Murray & Trettel, Inc.. 600 First Bank Drive. Suite A .Paatine, Ifinois .6oo67 3 (847) 963-90o0 ZIZ Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station 2009 prepared for Exelon Nuclear Warrenville, IL 60555 by Murray and'Trettel, Incorporated 600 First Bank Drive, Suite A Palatine, IL 60067 (847) 963-9000 e-mail: mt@weathercommand.com For ExelopIUse Only Reviewed By: Date: Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Table of Contents Section Description Page List of Tables ........................................................................................

ii 1 Introduction

........................................................................................

1 2 Sum m ary ...........................................................................................

2 3 Data Acquisition

.................................................................................

3.4 Data Analysis ....................................................................................

5 5 Results .............................................................................................

10 Site Calibration logs ...................................................................

Appendix Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 6oo67 (847)963-9ooo ii List of Tables I Number Description Page 1 1 Instrument Locations

...............................

4 2 Data Loggers ....................................

4 I 3 W ind Direction Classes ..................................................................

7* 4 W ind Speed Classes ....................................................................

7 5 Atmospheric Stability Classes ........................................................

8 6 Data Recovery Summary ............................................................

11 7 Wind Rose, January-March 2009 ................................................

14 8 W ind Rose, April-June 2009 ................................................................

16 9 Wind Rose, July-September 2009 ...............................................

18 10 Wind Rose, October-December 2009 ........................................

20 3 11 Wind Rose, January-December 2009 ........................................

22 12 P recipitation Totals ...............................................................................

24 13 Maximum Doses Resulting From Airborne Releases ..................

25 I I I I I U.3Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Introduction The purpose of the meteorological program being conducted at the Byron Station site is to provide information sufficient to assess the local weather conditions and to determine the degree of atmospheric dispersion of airborne radioactive effluent from the station.The meteorological tower is 250 ft. high and is instrumented at two levels. Wind speed and direction are measured at 30 ft. and 250 ft. Ambient temperature is measured at 30 ft. Differential temperature, referenced to 30 ft., is measured at 250 ft. Dew point temperature is measured at 30 ft. Precipitation is measured at approximately 3 ft.Joint frequency stability wind rose tables of wind direction, wind speed, and stability are routinely tabulated from hourly measurements.

The quarterly and annual tables are included in this report.Descriptions of the instruments and digital recorder are given in Section 3 (Data Acquisition) of this report. Data reduction and processing are described in Section 4 (Data Analysis).

The results given in Section 5 of this report include modeled maximum whole body doses, skin doses, organ doses based upon airborne releases, and site meteorology.

Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 2. Summary The Byron Station meteorological monitoring program produced 52,472 hours0.00546 days <br />0.131 hours <br />7.804233e-4 weeks <br />1.79596e-4 months <br /> of valid data out of a possible 52,560 parameter hours during 2009 (365 days x 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s/day x 6 measured priority parameters), which represents an overall data recovery rate of 99.8%. Priority parameters are all parameters except dew point temperature and precipitation.

The stability wind rose tables included in this report have been generated using the 30 ft.wind data with the 250-30 ft. differential temperature data.The maximum annual calculated cumulative doses resulting from airborne releases were as follows.Unit 1: gamma air dose beta air dose whole body dose skin dose organ (teenager thyroid)Unit 2: gamma air dose beta air dose whole body dose skin dose organ (teenager thyroid)1.076 x 10"5 mrad 4.261 x 10"4 mrad 4.828 x 10-6 mrem 2.375 x 104 mrem 8.097 x 104 mrem 8.559 X 10-8 mrad 2.564 x 105 mrad 4.892 x 106 mrem 1.480 x 10"5 mrem 7.996 x 104 mrem Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo 3. Data Acquisition Wind speed and direction are measured with Climatronics F460 wind sensors. The wind speed sensors have a starting speed of 0.5 mph (0.22 mps), a range of 0 to 100 mph (0 to 44.7 mps), and a system accuracy of +/-1.0 mph at 100 mph (+/-0.45 mps at 44.7 mps). The wind direction sensors have a threshold speed of 0.5 mph (0.22 mps), a range of 0 to 5400, and a system accuracy of +/-50.Ambient and differential temperatures are measured with the Climatronics 100093 system. Ambient temperature is measured within the range of -22 to 122 0 F (-30.0 to 45.0°C) with an accuracy of +/-0.5 0 F (+0.3 0 C). Differential temperature is measured within the range of -10.0 to 10.0°F (-5.6 to 5.6 0 C) with an accuracy of +/-0.18 0 F (+/-0.10 0 C). Dew point temperature is measured with the Climatronics 101197 system. Dew point temperature is measured with the range of -22 to 122 0 F (-30.0 to 45.00C) with an accuracy of +/-2.7 0 F (1.5 0 C).Precipitation is measured with a Climatronics 100097-1 tipping bucket rain gauge and is measured in increments of one one-hundredth of an inch with a system accuracy of+/-0.01" (+/-0.25mm).

Instrument types and locations are summarized in Table 1.The meteorological data are collected and stored by a Campbell Scientific CR1000 Data Logger. The Campbell Scientific CR1000 measures the analog voltages of the instruments and records the digital equivalent within the range of 0 to +5 volts. Data are obtained from the Campbell Scientific CR1000 by a direct dial telephone hookup to an in-house computer system.As a backup to the CR1000, data are also recorded with a Johnson Yokogawa Corp. digital recorder (JYC DA100 data acquisition unit). Data are sampled every 10 seconds.Data loggers are summarized in Table 2.Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9000 Table I Instrument Locations Measurement Wind Speed Wind Direction Differential Temperature Wind Speed Wind Direction Ambient Temperature Dew Point Temperature Precipitation Sensor Type Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 1001197 Climatronics 100097-1 Location Tower Tower Tower Tower Tower Tower Tower Ground Elevation 250 ft.250 ft.250 ft.30 ft.30 ft.30 ft.30 ft.3 ft.Table 2 Data Loggpers Sampling Frequency Measurement Winds, Temperatures, and Precipitation Winds, Temperatures, and Precipitation Logaer TyDe Campbell Scientific CR1000 Johnson Yokogawa Corp. Digital Recorder (JYC DA100 and Contec IPC-PTIM300(PC)WOU) digital recorder 1 sec.10 sec.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Ilinois 60067 (847)963-9ooo 4. Data Analysis The Byron data logger is routinely interrogated to obtain hourly average data. The data are then stored in the meteorological data base and listings of the data are generated.

The data listings are examined by qualified personnel and any apparent problems are brought to the attention of the Project Manager or Meteorological Technician and the Instrument Maintenance staff.Hourly values of wind speed, wind direction, ambient temperature, differential temperature, dew point temperature, and precipitation are obtained through measurements taken at the site. The standard deviation of wind direction (sigma) is derived. The wind direction variation is described in terms of the standard deviation of the direction about the mean direction.

The CR1000 computes an hourly value of wind sigma by taking the Root-Mean-Square (RMS) of the four quarter-hour wind sigma values. The quarter-hour wind sigma values are calculated directly from the one second wind direction samples during the 15 minute period.The data base files are edited approximately once a week. Missing data logger values are replaced with digital recorder values, when available.

Invalid data are deleted from the data base.When an hourly value is missing or invalid, the numeral 999 is entered into the computer data file in the appropriate location.

When the wind direction changes substantially relative to its short term fluctuations, the numeral 888 can be entered into the wind sigma location to indicate shifting winds. When the wind blows with velocities near the sensing threshold of the instrument, the numeral 777 can be entered into the wind direction, wind speed, and wind sigma locations to indicate light and variable winds.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo A professional meteorologist reviews the data, calibration findings, equipment maintenance reports, and other information and determines which data are valid. Only the valid data are retained in the data base.As a quality control measure, a monthly comparison is made of Microtel and digital recorder data. An investigation is made into the reasons for any significant differences between the sets of values.Joint frequency stability wind rose tables of hourly data measured at the site are generated.

These tables indicate the prevailing wind direction, wind speed, and stability classes measured during the period of observation as well as the joint frequencies of occurrence of the wind direction, wind speed, and stability classes. The values are also used as input to the atmospheric transport and diffusion models. Wind direction, wind speed, and stability classes are given in Tables 3, 4, and 5.Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Table 3 Wind Direction Classes IF IF IF IF IF IF IF IF IF IF IF IF IF IF IF IF 348.750 <11.250 <33.750 <56.250 <78.750 <101.250 <123.750 <146.250 <168.750 <191.250 <213.750 <236.250 <258.750 <281.250 <303.750 <326.250 <WD <WD <WD <WD <WD<WD <WD <WD<WD<WD <WD <WD<WD <WD <WD <WD <11.250 THEN Class is 33.750 THEN Class is 56.250 THEN Class is 78.750 THEN Class is 101.250 THEN Class is 123.750 THEN Class is 146.250 THEN Class is 168.750 THEN Class is 191.250 THEN Class is 213.750 THEN Class is 236.250 THEN Class is 258.750 THEN Class is 281.250 THEN Class is 303.750 THEN Class is 326.250 THEN Class is 348.750 THEN Class is N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Table 4 Wind Speed Classes IF 0.0 mph < WS < 0.5 mph THEN Class is 1 IF 0.5 mph < WS < 3.5 mph THEN Class is 2 IF 3.5 mph < WS < 7.5 mph THEN Class is 3 IF 7.5 mph < WS < 12.5 mph THEN Class is 4 IF 12.5 mph < WS < 18.5 mph THEN Class is 5 IF 18.5 mph < WS < 24.5 mph THEN Class is 6 IF 24.5 mph < WS THEN Class is 7 Murray & Trettel, Inc. 6oo Frst Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo I.I!.I I I I I I I0-8-Table 5 Atmospheric Stability Classes Differential Temperature Interval.(in 0 CI100m) (1)Differential Temperature Interval (in OF over the 250-30 ft. interval)

(2)Class Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable-1.9 <-1.7 <-1.5 <-0.5 <1.5 <4.0 <AT AT AT AT AT AT AT-1.9-1.7-1.5-0.5 1.5 4.0-2.3 <-2.1 <-1.9 <-0.7 <1.8 <4.8 <AT AT AT AT AT AT AT-2.3-2.1-1.9-0.7 1.8 4.8"I from ANSI/ANS 2.5 (21 ANSI/ANS 2.5 intervals scaled for instrument heights on the Byron meteorological tower Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo A description of the procedures and computational techniques used to calculate the doses resulting from radioactive releases is found in the Murray and Trettel, Inc. "Offsite Dose Calculation Manual" (ODCM-Rev.

9), dated January 1996. The ODCM describes the atmospheric transport and diffusion models used to calculate the doses and concentrations resulting from airborne releases.Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 5. Results 5.1 Instrument Maintenance The maintenance program followed during 2009 was composed of routinely scheduled visits and equipment repairs. Routine site visits were made to inspect the sensing and recording systems for proper operation.

In addition, routine maintenance and calibration checks of all tower-mounted and ground level equipment were performed every four months. A description of the calibration and field procedures is found in the Murray and Trettel, Inc. "P1009 Procedures Manual" (July 2009).In January, a heat pad at the 30 ft. level was replaced.In March, there was some 250 ft. wind speed data loss due to icing.In April, some wire shielding was damaged by mice. The wires were repaired and mouse traps were set.In May, the annual tower inspection was performed.

Also in May, the digital recorder was inaccessible by modem. The phone line was unhooked, then re-connected to restore accessibility.

In June, 3 blocks of surge protection for signals to the process computer were damaged. The surge protection was replaced.

Surge protection for the phone lines was also replaced.In July, a bad phone line was repaired by Verizon.In October, a side light was replaced.No other significant problems were encountered with the equipment, and at the end of the year, no problems were evident at the site.Murray & Trettel, Inc. 60o First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo 5.2 Data Recovery The record of data recovery for the year is summarized in Table 6.Table 6 Byron Site Data Recovery Summary 2009 Measurement Wind Speed Wind Speed Wind Direction Wind Direction Ambient Temperature Differential Temperature Dew Point Temperature Precipitation Elevation 30 ft.250 ft.30 ft.250 ft.30 ft.250-30 ft.30 ft.3 ft.Recovered Hours 8751 8718 8751 8750 8751 8751 8748 8709 Recovered Percent 99.9 99.5 99.9 99.9 99.9 99.9 99.9 99.4 Lost Hours 9 42 9 10 9 9 12 51 Percent Chan-qed 0.7 0.5 1.3 0.5 0.1 0.5 21.4 0.7 AVERAGE* 99.8* average of priority parameters (all except dew point temperature and precipitation)

Valid Hours Lower Level Joint Frequency

% 8751 Upper Level Joint Frequency

% 8717 Recovered Percent 99.9 99.5 Lost Hours 9 43 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 I.P5.3 I I I i I I Ie I I I 1 I I I.Ue-12-Summary of Billings for Equioment Repairs, Replacement Parts, and Other Work not Included in Fixed-Cost Maintenance A-greement

-2009 Description

-Byron Jaruary Meteorological equipment maintenance Febrary Meteorological parts, materials, and contractor services March Meteorological parts, materials, and contractor services ADfil Meteorological equipment maintenance Meteorological parts, materials, and contractor services Ma, Meteorological equipment maintenance Meteorological parts, materials, and contractor services June Meteorological equipment maintenance Meteorological parts, materials, and contractor services Meteorological equipment maintenance Meteorological parts, materials, and contractor services Auaus-none-September Meteorological equipment maintenance October Meteorological equipment maintenance November Meteorological parts, materials, and contractor services December Meteorological parts, materials, and contractor services Annual Total: Cost$ 100.00 96.32 334.82 250.00 263.23 379.06 300.65 758.12 159.68 346.80 332.25 0.00 100.00 346.80 158.10 93.60$ 4,019.43 Murray & Trettel, Inc. 600 First Bank Drive. Suite A Palatine, Illinois 60067 (847) 963-9000 5.4 Stability Wind Rose Data The quarterly and annual stability wind roses are given in Tables 7 through 11. Wind speed classes have been altered to reflect the sensor threshold.

For the year, winds measured at 30 ft. most frequently came from the west-northwest (9.33%) and fell into the 3.6-7.5 mph and 7.6-12.5 mph wind speed classes (36.72% and 32.95% respectively).

Calms (wind speeds at or below the sensor threshold) were measured 0.20% of the time. Speeds greater than 24.5 mph were measured 0.11% of the time.Stability based on the 250-30 ft. differential temperature most frequently fell into the neutral classification (48.53%).Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo I .TABLE 7-14-Byron Generating Station 30 ft. Wind Speed and Direction January-March.

2009 250Ft-3OFt Delta-T (F)Number of Observations

-2161 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

.........

STABILITY CLASSES ..........

m CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL I EU MU C SU ANS M MS ES EU MU I1SU-N 3 SS ES 7 SS MS m ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.00 0.00 0.00 0.00 0.00 0.93 1.11 0.09 0.00 0.00 0.00 0.00 1.99 0.19 0.00 0.00 0.00 0.14 0.00 1.30 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.28 l0.00 0.00 0.00 0.00 0.00 0.74 0.19 0.05 0.00 0.00 0.00 0.05 1.67 0.14 0.00 0.00 0.00 0.05 0.05 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.46 0.14 0.05 0.00 0.00 0.05 0.00 0.37 0.42 0.00 0.00 0.00 0.00 0.00 0.42 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.05 0.00 0.00 0.00 0.05 0.09 0.14 0.05 0.00 0.00 0.00 0.00 0.65 0.14 0.00 0.00 0.00 0.00 0.00 0.42 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.23 0.14 0.00 0.00 0.00 0.00 0.74 0.60 0.23 0.00 0.00 0.00 0.00 0.79 0.97 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00"0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.19 0.09 0.00 0.00 0.00 0.00 0.42 0.51 0.28 0.42 0.00 0.00 0.05 0.83 0.46 0.23 0.14 0.00 0.00 0.09 0.51 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.05 0.00 0.00 0.00 0.00 0.28 0.79 0.42 0.51 0.00 0.00 0.05 0.88 1.11 0.14 0.05 0.00 0.00 0.09 0.51 0.74 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.05 0.00 0.00 0.00 0.00 0.74 0.69 0.60 0.51 0.00 0.00 0.05 2.31 1.67 0.51 0.09 0.00 0.00 0.09 1.20 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.69 0.42 0.65 0.00 0.00 0.00 0.00 0.88 1.30 0.60 0.09 0.00 0.00 0.00 1.30 0.69 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.05 0.00 0.00 0.00 0.60 0.65 0.42 0.09 0.00 0.00 0.14 0.83 0.56 0.00 0.00 0.00 0.00 0.05 0.60 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.14 0.19 0.00 0.00 0.00 0.60 1.02 0.09 0.00 0.00 0.00 0.00 1.25 0.46 0.00 0.00 0.00 0.00 0.00 0.74 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.28 0.05 0.00 0.00 0.00 0.00 0.69 0.60 0.14 0.00 0.00 0.00 0.00 0.46 0.56 0.00 0.00 0.00 0.00 0.00 0.83 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.28 0.00 0.00 0.00 0.00 0.79 1.76 0.32 0.00 0.00 0.00 0.00 1.67 1.62 0.00 0.00 0.09 0.19 0.09 1.62 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.37 0.23 0.09 0.00 0.00 0.00 1.62 1.30 0.14 0.00 0.00 0.00 0.05 3.38 0.97 0.00 0.00 0.05 0.09 0.23 1.71 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.05 0.14 0.00 0.00 0.00 1.57 1.71 0.23 0.00 0.05 0.05 0.14 2.78 0.88 0.00 0.00 0.00 0.23 0.09 1.48 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.19 0.05 0.14 0.00 0.00 0.00 0.79 1.62 0.37 0.00 0.00 0.00 0.05 3.15 1.06 0.00 0.00 0.00 0.00 0.05 1.71 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.05 0.00 0.00 0.00 0.00 0.00 0.00 1.06 2.73 1.25 0.60 0.00 0.00 0.05 0.05 11.75 13.23 4.12 1.53 0.00 0.00 0.23 0.05 0.00 0.00 0.28 0.00 0.00 1.06 2.73 1.25 0.60 5.65 0.05 0.05 11.75 13.23 4.12 1.53 30.73 EU MU 8 SU-N 1 SS 2MS ES EU 1 MU 3 SU-N 1 SS 8 MS ES 0.05 0.09 0.56 23.88 12.49 1.48 0.37 0.05 0.09 0.56 23.88 12.49 1.48 0.37 38.92 0.14 0.14 0.69 0.83 14.85 3.56 0.09 0.00 0.69 0.83 14.85 3.56 0.09 0.00 20.18 Murray & Trettel, Inc. 6oo F'rst Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo i TABLE 7 continued-15-Byron Generating Station 30 ft. Wind Speed and Direction January-March.

2009 250Ft-3OFt Delta-T (F)------------..........

STABILITY CLASSES ----------

NW NNW TOTAL EU MU SU N SS MS ES T SPEED CLASS----------------------------------

WIND DIRECTION CLASSES N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW EU I MU 9 SU 2SS 4 M ES EU TSU N 2 SS 4 M ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.19 0.00 0.O0 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.09 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.32 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 2.27 1.20 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.05 0.00 0.00 0.00 0.14 2.27 1.20 0.00 0.00 3.61 0.00 0.00 0.32 0.05 0.00 0.00 0.37 99.72 TOT 5.97 3.70 2.04 1.71 3.98 5.23 6.29 9.25 7.17 5.09 5.28 3.93 10.13 10.50 9.90 9.25 99.72 0.19 0.83 1.57 54.37 33.32 6.94 2.50 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.14 0.00 4.35 1.39 0.09 0.00 0.00 0.05 0.09 2.92 0.60 0.05 0.00 0.00 0.09 0.00 1.30 0.60 0.05 0.00 0.00 0.00 0.05 1.20 0.37 0.09 0.00 0.00 0.00 0.00 1.76 1.85 0.37 0.00 0.00 0.00 0.14 2.27 1.67 0.60 0.56 0.00 0.00 0.14 1.80 3.19 0.60 0.56 0.00 0.00 0.14 4.40 2.96 1.16 0.60 0.00 0.00 0.00 3.24 2.50 1.34 0.09 0.00 0.00 0.19 2.36 1.90 0.51 0.14 0.00 0.00 0.05 2.92 1.90 0.23 0.19 0.00 0.00 0.00 2.17 1.57 0.19 0.00 0.09 0.19 0.19 4.86 4.21 0.60 0.00 0.05 0.09 0.28 6.99 2.64 0.37 0.09 0.05 0.28 0.23 5.88 3.05 0.28 0.14 0.00 0.00 0.09 5.74 2.87 0.42 0.14 0.19 0.83 1.57 54.37 33.32 6.94 2.50-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.23 2.13 2.17 1.43 0.00 0.00 0.00 0.32 0.97 1.85 0.56 0.00 0.00 0.00 0.00 0.69 0.83 0.46 0.05 0.00 0.00 0.14 0.32 0.79 0.46 0.00 0.00 0.00 0.56 1.57 1.76 0.09 0.00 0.00 0.00 0.42 1.62 1.71 0.88 0.56 0.05 0.00 0.14 1.99 2.22 1.34 0.60 0.00 0.00 0.14 2.55 4.63 1.90 0.05 0.00 0.00 0.09 1.76 2.87 2.08 0.37 0.00.0.00 0.23 1.76 1.53 0.88 0.69 0.00 0.00 0.42 1.71 1.71 1.02 0.42 0.00 0.00 0.42 1.43 1.02 0.97 0.09 0.00 0.00 0.65 2.87 3.29 2.45 0.60 0.28 0.00 0.79 3.05 4.40 2.08 0.14 0.05 0.00 0.65 3.52 3.89 1.80 0.05 0.00 0.00 0.46 2.78 4.26 1.76 0.00 0.00 0.28 5.65 30.73 38.92 20.18 3.61 0.37-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo TABLE 8-16-Byron Generating Station 30 ft. Wind Speed and Direction April-June.

2009 250Ft-30Ft Delta-T (F)Number of Observations

-2173 Values are Percent Occurrence SPEED----------------------------------

WIND DIRECTION CLASSES.....................

.........

-STABILITY CLASSES ..........

W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW EU MU C SU A N L SS MMS ES EU MU SU N SS MS ES MS 4 SU 8 SU-N 7 SS 2MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.18 0.32 0.00 0.00 0.00 0.00 0.74 0.83 0.23 0.00 0.00 0.00 0.00 1.20 0.09 0.00 0.00 0.00 0.00 0.05 0.74 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.28 0.14 0.00 0.00 0.00 0.00 0.87 0.87 0.14 0.00 0.00 0.14 0.28 1.43 0.41 0.00 0.00 0.09 0.05 0.09 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.28 0.14 0.00 0.00 0.00 0.05 0.60 0.60 0.05 0.00 0.00 0.00 0.23 1.43 0.51 0.00 0.00 0.00 0.00 0.05 0.69 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.55 0.09 0.09 0.00 0.00 0..05 1.20 0.60 0.09 0.00 0.00 0.14 0.18 2,30 1.01 0.09 0.09 0.00 0.00 0.00 1.15 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.28 0.18 0.09 0.00 0.00 0.05 1.47 2.30 0.55 0.14 0.09 0.18 0.28 2.12 0.60 0.05 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.18 0.09 0.05 0.00 0.00 0.05 0.28 0.37 0.60 0.14 0.00 0.09 0.18 1.01 1.43 0.09 0.05 0.00 0.00 0.00 0.32 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.05 0.00 0.00 0.00 0.00 0.64 0.51 0.55 0.18 0.00 0.00 0.05 0.51 0.69 0.05 0.05 0.00 0.00 0.09 0.37 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.23 0.09 0.00 0.00 0.00 0.41 0.37 0.37 0.37 0.00 0.00 0.00 0.78 0.83 0.78 0.05 0.00 0.00 0.14 0.74 0.41 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.09 0.18 0.00 0.00 0.00 0.64 0.69 0.28 0.41 0.00 0.00 0.00 0.78 1.98 0.32 0.05 0.00 0.00 0.05 0.32 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.23 0.05 0.00 0.00 0.00 0.74 0.41 0.46 0.18 0.00 0.00 0.00 0.78 1.15 0.00 0.00 0.00 0.00 0.32 1.06 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.37 0.18 0.09 0.00 0.00 0.00 0.23 0.41 0.23 0.00 0.00 0.05 0.05 0.51 0.18 0.00 0.00 0.00 0.00 0.00 0.46 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.28 0.64 0.14 0.00 0.00 0.05 0.74 0.60 0.05 0.00 0.09 0.00 0.05 0.74 0.23 0.00 0.00 0.09 0.09 0.05 0.55 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.32 1.01 0.14 0.00 0.00 0.00 1.24 1.52 0.32 0.00 0.00 0.00 0.05 0.64 0.46 0.00 0.00 0.14 0.00 0,14 0.92 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.97 0.28 0.00 0.00 0.00 1.56 0.87 0.23 0.00 0.00 0.09 0.18 2.53 1.06 0.00 0.00 0.00 0.05 0.14 1.66 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.41 0.14 0.87 0.18 0.00 0.05 0.09 1.61 0.78 0.05 0.00 0.00 0.05 0.05 2.12 0.28 0.00 0.00 0.05 0.28 0.28 1.70 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.28 0.05 0.00 0.00 0.09 1.38 0.32 0.37 0.00 0.00 0.00 0.00 1.10 0.37 0.00 0.00 0.00 0.05 0.14 0,55 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.05 0.00 0.00 0.00 0.00 2.21 3'.54 5.52 1.43 0.00 0.00 0.05 0.41 14.36 12.06 4.56 1.43 0.18 0.18 0.74 1.56 19.97 11.27 1.38 0.28 0.37 0.37 0.55 1.52 11.83 2.67 0.05 0.00 0.05 0.05 0.00 0.05 0.14 0.00 0.00 0.00 2.21 3.54 5.52 1.43 12.70 0.00 0.05 0.41 14.36 12.06 4.56 1.43 32.86 0.74 1.56 19.97 11.27 1.38 0.28 35.39 EU 1 U 3 SU-N 1 SS 8 MS ES 0.55 1.52 11.83 2.67 0.05 0.00 16.98 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo i TABLE 8 continued-17-Byron Generating Station 30 ft. Wind Speed and Direction--------------

WIND DIRECTION CLASSES April-June.

2009 2SOFt-3OFt Delta-T (F)---------------------...

STABILITY CLASSES ----------

W WNW NW NNW TOTAL EU MU SU N SS MS ES T SPEED CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW I EU I MU 9 SU!N 2 SS 4 MS I ES EU G MU T SU N ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.18 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.23 1.20 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.05 0.23 1.20 0.23 0.00 0.00 1.70 0.00 0.00 0.05 0.05 0.00 0.00 0.09 TOT 4.56 5.71 5.48 8.33 8.61 5.11 3.96 5.80 6.53 6.17 2.99 5.11 7.36 9.94 9.02 5.06 99.86 0.55 1.38 3.73 49.65 29.87 11.50 3.18 99.86 Wind Direction by Stability I N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.00 0.05 2.85 1.10 0.55 0.00 0.09 0.18 0.37 3.22 1.56 0.28 0.00 0.00 0.05 0.37 3.22 1.66 0.18 0.00 0.00 0.14 0.23 4.74 2.76 0.28 0.18 0.09 0.23 0.32 3.77 3.18 0.78 0.23 0.00 0.09 0.23 1.70 2.07 0.78 0.23 0.00 0.00 0.14 1.61 1.33 0.64 0.23 0.00 0.00 0.14 1.98 1.75 1.43 0.51 0.00 0.00 0.05 1.98 3.18 0.69 0.64 0.00 0.00 0.32 2.67 2.25 0.69 0.23 0.00 0.05 0.05 1.29 1.10 0.41 0.09 0.18 0.09 0.28 2.53 1.20 0.69 0.14 0.14 0.00 0.23 3.13 2.39 1.33 0.14 0.00 0.14 0.32 5.84 2.16 1.20 0.28 0.05 0.37 0.41 5.89 1.20 0.92 0.18 0.00 0.05 0.23 3.18 0.92 0.64 0.05 0.55 1.38 3.73 49.65 29.87 11.50 3.18-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.69 1.79 1.29 0.78 0.00 0.00 0.00 0.64 1.89 2.25 0.83 0.09 0.00 0.00 0.69 1.29 2.16 1.01 0.32 0.00 0.00 0.78 1.93 3.82 1.75 0.05 0.00 0.00 0.74 4.51 3.31 0.05 0.00 0.00 0.00 0.41 1.43 2.85 0.41 0.00 0.00 0.00 0.18 1.89 1.33 0.55 0.00 0.00 0.00 0.37 1.52 2.44 1.33 0.09 0.05 0.00 0.51 2.02 3.13 0.64 0.23 0.00 0.00 0.46 1.79 1.93 1.84 0.14 0.00 0.00 0.74 0.87 0.78 0.60 0.00 0.00 0.00 1.24 1.43 1.10 0.87 0.41 0.05 0.00 1.61 3.08 1.15 1.29 0.23 0.00 0.00 1.43 2.67 3.87 1.89 0.09 0.00 0.00 1.61 2.58 2.49 2.30 0.05 0.00 0.00 0.60 2.16 1.47 0.83 0.00 0.00 0.14 12.70 32.86 35.39 16.98 1.70 0.09-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo i TABLE 9-18-Byron Generating Station 30 ft. Wind Speed and Direction July-September.

2009 25OFt-3OFt Oelta-T (F)Number of Observations

-2178 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ..................................

  • CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL.........

STABILITY CLASSES ----------

EU MU SU N SS MS ES TOTAL I EU MU C SU A N LSS M MS ES EU I SU-N 3 SS MS ES 4Sl N 7 SSS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.51 0.23 0.23 0.05 0.00 0.05 1.56 0.64 0.28 0.05 0.00 0.00 0.09 0.69 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.46 0.18 0.23 0.00 0.00 0.18 1.01 0.60 0.51 0.00 0.00 0.00 0.05 0.05 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.46 0.28 0.18 0.00 0.05 0.09 0.32 0.83 0.09 0.00 0.00 0.00 0.00 0.28 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.51 0.55 0.23 0.28 0.00 0.05 0.46 0.60 1.33 0.78 0.00 0.23 0.00 0.05 0.69 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.78 0.73 0.96 0.64 0.09 0.09 0.32 1.93 1.65 1.79 0.55 0.00 0.05 0.00 0.37 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.23 0.18 0.28 0.00 0.05 0.23 0.78 0.64 0.46 0.64 0.00 0.00 0.00 0.18 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.51 0.28 0.18 0.28 0.00 0.05 0.09 0.92 0.96 0.64 0.23 0.00 0.00 0.00 0.78 0.69 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.28 0.09 0.28 0.00 0.00 0.00 0.69 1.29 1.24 0.28 0.00 0.00 0.00 0.51 0.41 0.05 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.32 0.51 0.69 0.00 0.05 0.09 0.37 1.47 0.78 0.32 0.00 0.00 0.14 0.87 0.69 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.28 0.64 0.37 0.00 0.00 0.09 0.60 0.60 0.28 0.09 0.00 0.14 0.23 1.38 1.01 0.00 0.00 0.00 0.05 0.05 0.28 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.78 0.73 0.32 0.00 0.00 0.00 0.73 0.55 0.05 0.00 0.00 0.05 0.23 1.06 0.64 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.55 0.69 0.96 0.28 0.00 0.00 0.05 0.78 1.10 0.09 0.00 0.00 0.00 0.18 0.83 0.14 0.00 0.00 0.00 0.00 0.05 0.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.55 0.60 0.51 0.00 0.00 0.05 0.78 1.56 0.18 0.00 0.00 0.00 0.37 0.87 0.09 0.00 0.00 0.00 0.00 0.00 0.28 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.41 0.60 0.60 1.06 0.05 0.00 0.09 2.07 0.96 0.14 0.00 0.00 0.00 0.05 1.42 0.28 0.00 0.00 0.00 0.00 0.00 0.78 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.69 0.37 1.19 1.61 0.00 0.00 0.05 2.16 1.29 0.00 0.00 0.05 0.05 0.09 1.52 0.18 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0..0o 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.55 0.28 0.69 1.01 0.00 0.00 0.14 1.79 1".15 0.28 0.00 0.05 0.14 0.14 1.01 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.14 0.05 0.05 0.00 0.00 0.00 0.00 6.52 7.35 8.26 8.22 0.18 0.18 0.32 1.97 17.08 16.62 7.58 2.16 0.32 0.32 0.41 1.61 12.49 5.10 0.14 0.00 0.00 0.00 0.09 0.14 0.05 0.05 0.32 0.00 0.00 6.52 7.35 8.26 8.22 30.35 0.32 1.97 17.08 16.62 7.58 -2.16 45.91 EU MU 8 SU*N I SS 2MS ES EU 1MUJ 3 SU-N 1 SS 8 MS ES 0.41 1.61 12.49 5.10 0.14 0.00 20.06 0.00 0.05 0.09 1.93 0.73 0.00 0.00 0.00 0.05 0.09 1.93 0.73 0.00 0.00 Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9ooo I TABLE 9 continued-1 9-Byron Generating Station 30 ft. Wind Speed and Direction July-September.

2009 250Ft-3OFt Delta-T (F)I SPEED ----------------------------------

WIND DIRECTION CLASSES -------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW------------E EU 1MU 9 SU 2 SS 4 MS ES EU T SU N 2ES 4 HS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0 0 0 0 0 0 0 0 0, 0, 0.0.0 NW NNW TOTAL EU.00 0.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00.00 0.00 0.23.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00.00 0.00 0.00------ STABILITY CLASSES ----------

MU SU N SS MS ES TO 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 TOT 4.82 3.58 3.12 6.01 10.10 4.18 5.65 5.37 6.57 6.66 5.51 6.11 6.29 8.86 9.27 7.25 99.68 0.51 0.78 3.67 38.34 29.94 16.02 10.42 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.05 0.00 0.14 2.71 1.15 0.51 0.28 0.00 0.00 0.23 1.29 1.10 0.73 0.23 0.00 0.05 0.09 0.83 1.61 0.37 0.18 0.23 0.05 0.51 1.79 2.16 1.01 0.28 0.09 0.14 0.32 3.08 2.53 2.75 1.19 0.00 0.05 0.23 1.29 1.06 0.64 0.92 0.00 0.05 0.09 2.20 1.97 0.83 0.51 0.00 0.00 0.00 1.42 2.02 1.38 0.55 0.00 0.05 0.23 1.47 2.48 1.33 1.01 0.00 0.18 0.37 2.48 2.25 0.92 0.46 0.00 0.05 0.23 2.16 1.97 0.78 0.32 0.00 0.00 0.28 2.57 1.93 1.06 0.28 0.00 0.00 0.41 2.30 2.30 0.78 0.51 0.05 0.00 0.14 4.91 1.97 0.73 1.06 0.05 0.05 0.14 4.41 1.84 1.19 1.61 0.05 0.14 0.28 3.35 1.47 0.96 1.01 0.51 0.78 3.67 38.34 29.94 16.02 10.42-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 1.42 2.62 0.78 0.00 0.00 0.00 0.00 1.10 2.30 0.18 0.00 0.00 0.00 0.00 1.15 1.38 0.60 0.00 0.00 0.00 0.00 1.56 3.21 1.24 0.00 0.00 0.00 0.00 3.12 6.43 0.55 0.00 O.00 0.00 0.00 1.01 2.80 0.32 0.05 0.00 0.00 0.00 1.24 2.89 1.47 0.05 0.00 0.00 0.00 0.83 3.49 0.96 0.09 0.00 0.00 0.00 1.70 3.08 1.74 0.05 0.00 0.00 0.00 1.52 1.65 2.75 0.73 0.00 0.00 0.00 2.16 1.33 1.97 0.05 0.00 0.00 0.00 2.48 2.02 1.15 0.46 0.00 0.00 0.00 2.02 2.57 1.33 0.37 0.00 0.00 0.00 2.66 3.31 1.74 0.92 0.23 0.00 0.00 3.86 3.49 1.88 0.05 0.00 0.00 0.00 2.53 3.35 1.38 0.00 0.00 0.00 0.32 30.35 45.91 20.06 2.80 0.23 0.00-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo I TABLE 10-20-Byron Generating Station 30 ft. Wind Speed and Direction October-December.

2009 25OFt-3OFt Delta-T (F)Number of Observations

-2201 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL.........

STABILITY CLASSES ----------

EU MU SU N SS MS ES TOTAL I EU MU C SU A N LSS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.14 0.27 EU MU 1 SU-N 3 SS MS ES 0.00 0.00 4 SU 0.00.N 0.41 7 SS 0.68 MS 0.00 ES 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.05 0.05 0.00 0.00 0.00 0.36 0.77 0.14 0.00 0.05 0.05 0.00 0.45 0.14 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.05 0.00 0.00 0.00 0.18 0.68 0.00 0.05 0.00 0.00 0.00 0.50 0.73 0.05 0.00 0.00 0.00 0.00 1.36 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.09 0.00 0.00 0.00 0.00 0.00 0.50 0.73 0.14 0.18 0.00 0.00 0.00 0.77 0.55 0.23 0.00 0.00 0.00 0.00 0.73 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.36 0.55 0.05 0.05 0.00 0.05 0.00 2.45 0.95 0.82 0.23 0.00 0.00 0.05 2.00 0.55 0.00 0.00 0.00 0.00 0.00 0.32 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.36 0.18 0.00 0.00 0.00 0.09 0.55 1.23 0.36 0.18 0.00 0.00 0.00 1.00 0.68 0.09 0.36 0.00 0.00 0.00 0.45 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.23 0.05 0.00 0.00 0.00 0.05 1.00 1.50 1.41 0.18 0.00 0.00 0.05 0.82 1.41 0.32 0.05 0.00 0.00 0.00 0.27 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.09 0.05 0.00 0.00.0.00 0.91 1.27 0.45 0.14 0.00 0.00 0.09 1.23 2.00 0.18 0.05 0.00 0.00 0.00 0.50 0.59 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.50 0.23 0.09 0.00 0.00 0.00 1.00 1.27 0.86 0.32 0.00 0.00 0.05 1.50 1.50 0.36 0.00 0.00 0.00 0.00 0.55 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.14 0.27 0.18 0.00 0.00 0.00 0.64 0.59 0.09 0.00 0.05 0.09 0.27 1.54 1.14 0.14 0.00 0.00 0.00 0.00 0.50 0.86 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.32 0.27 0.00 0.00 0.00 0.00 1.41 0.82 0.00 0.00 0.09 0.18 0.14 0.82 0.50 0.00 0.00 0.00 0.00 0.00 0.18 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.45 0.27 0.05 0.00 0.00.0.09 1.68 1.23 0.00 0.00 0.23 0.09 0.09 1.23 0.36 0.00 0.00 0.05 0.05 0.09 1.23 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.41 0.36 0.09 0.00 0.00 0.00 2.18 1.00 0.00 0.00 0.09 0.14 0.18 1.86 0.23 0.00 0.00 0.00 0.05 0.09 2.04 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.32 0.45 0.00 0.00 0.00 0.00 1.23 1.23.0.14 0.00 0.00 0.00 0.05 3.04 0.36 0.00 0.00 0.00 0.05 0.00.0.86 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.32 0.09 0.05 0.00 0.00 0.09 0.82 0.55 0.09 0.00 0.05 0.09 0.18 1.77 0.09 0.00 0.00 0.00 0.00 0.00 0.55 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.09 0.05 0.00 0.00 0.00 0.68 0.55 0.09 0.00 0.00 0.05 0.00 1.68 0.09 0.00 0.00 0.00 0.00 0.00 0.27 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 2.45 4.13 2.59 0.95 0.00 0.05 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 2.45 4.13 2.59 0.95 10.13 0.00 EU MU 8 SU-N 1 SS 2 MS ES EU IMU 3 SU.N 1 SS 8MS ES 0.00 0.00 0.00 2.36 0.36 0.00 0.00 0.00 0.00 0.00 0.41 0.00 0.00 0.00 0.00 0.00 0.05 0.32 15.99 15.04 4.59 1.32 0.55 0.55 0.68 1.14 22.58 10.68 1.36 0.45 0.05 0.05 0.18 0.18 10.22 3.68.0.00 0.00 15.04 4.59 1.32 37.30 0.05 0.32 15.99 0.68 1.14 22.58 10.68 1.36 0.45 37.44 0.18 0.18 10.22 3.68 0.00 0.00 14.31 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo I TABLE 10 continued-21-Byron Generating Station 30 ft. Wind Speed and Direction October-December.

2009 25OFt-3OFt Delta-T (F)I SPEED CLASS----------------------------------

WIND DIRECTION CLASSES ----------------------------------

STABILITY CLASSES ---.......

EU MU SU N SS M S TEW N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU ,IMU 9 SU 2 SS 4 M ES EU N 2ES 4 MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.45 0.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.45 0.27 0.00 0.00 0.73 0.00 0.00 0.00 0.00 0.00 0.00 0.00 99.95 TOT 4.91 2.18 3.82 4.41 8.72 5.77 7.81 7.72 8.86 6.82 5.18 7.59 9.31 8.04 4.95 3.82 99.95 0.59 0.91 1.64 51.75 33.80 8.54 2.73 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.00 0.00 3.32 1.14 0.14 0.32 0.05 0.09 0.00 0.86 0.95 0.18 0.05 0.00 0.00 0.00 2.04 1.64 0.05 0.09 0.00 0.00 0.00 2.18 1.68 0.36 0.18 0.00 0.05 0.05 5.13 2.36 0.86 0.27 0.00 0.00 0.09 2.09 2.41 0.64 0.55 0.00 0.00 0.09 2.18 3.54 1.77 0.23 0.00 0.00 0.09 2.73 3.95 0.73 0.23 0.00 0.00 0.05 3.32 3.63 1.45 0.41 0.05 0.09 0.27 3.00 2.73 0.50 0.18 0.09 0.18 0.14 2.50 2.00 0.27 0.00 0.27 0.14 0.27 4.23 2.36 0.27 0.05 0.09 0.18 0.27 6.54 1.77 0.36 0.09 0.00 0.05 0.05 5.45 1.91 0.59 0.00 0.05 0.09 0.27 3.36 0.95 0.18 0.05 0.00 0.05 0.00 2.77 0.77 0.18 0.05 0.59 0.91 1.64 51.75 33.80 8.54 2.73-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.64 1.14 2.73 0.41 0.00 0.00 0.00 0.18 1.27 0.68 0.05 0.00 0.00 0.00 0.14 0.91 1.27 1.50 0.00 0.00 0.00 0.27 1.54 1.54 1.04 0.00 0.00 0.00 1.00 4.50 2.59 0.64 0.00 0.00 0.00 0.64 2.41 2.14 0.50 0.09 0.00 0.00 0.36 4.13 2.64 0.64 0.05 0.00 0.00 0.32 2.77 3.54 1.09 0.00 0.00 0.00 1.04 3.45 3.41 0.91 0.05 0.00 0.00 0.91 1.32 3.23 1.36 0.00 0.00 0.00 0.68 2.23 1.73 0.55 0.00 0.00 0.00 0.77 3.00 2.00 1.64 0.18 0.00 0.00 1.04 3.18 2.50 2.27 0.32 0.00 0.00 1.04 2.59 3.45 0.91 0.05 0.00 0.00 0.68 1.54 2.18 0.55 0.00 0.00 0.00 0.41 1.32 1.82 0.27 0.00 0.00 0.05 10.13 37.30 37.44 14.31 0.73 0.00-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-90o0 ITABLE 11-22-Byron Generating Station 30 ft. Wind Speed and Direction January-December.

2009 25OFt-3OFt Delta-T (F)Number of Observations

-8713 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ..................................

.........

STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU, N SS MS ES TOTAL EU MU C SU A N M MS ES EU KU I SU-N 3 SS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.22 0.17 0.13 0.01-N0.91 7 SS 0.81 S 0.15 ES 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.26 0.09 0.07 0.00 0.00 0.05 0.75 0.61 0.21 0.00 0.01 0.05 0.09 0.90 0.18 0.01 0.00 0.02 0.03 0.03 0.26 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.21 0.10 0.06 0.00 0.02 0.03 0.39 0.56 0.05 0.01 0.00 0.01 0.06 0.64 0.49 0.01 0.00 0.00 0.00 0.01 0.62 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.20 0.31 0.09 0.09 0.00 0.01 0.14 0.60 0.70 0.26 0.05 0.06 0.03 0.06 1.10 0.49 0.08 0.02 0.00 0.00 0.00 0.57 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.38 0.45 0.33 0.20 0.02 0.03 0.09 1.65 1.38 0.85 0.23 0.02 0.06 0.08 1.32 0.56 0.01 0.00 0.00 0.01 0.00 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.24 0.14 0.08 0.00 0.01 0.09 0.50 0.69 0.42 0.34 0.00 0.02 0.06 0.76 0.68 0.10 0.14 0.00 0.00 0.02 0.32 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.18 0.15 0.08 0.07 0.00 0.01 0.03 0.71 0.94 0.76 0.28 0.00 0.00 0.03 0.75 0.98 0.13 0.03 0.00 0.00 0.05 0.29 0.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.10 0.11 0.10 0.00 0.00 0.00 0.69 0.91 0.67 0.32 0.00 0.00 0.03 1.21 1.23 0.38 0.05 0.00 0.00 0.06 0.62 0.41 0.01 0.00 0.00 0.00 0.00 0.0 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.25 0.21 0.24 0.00 0.01 0.02 0.68 0.96 0.64 0.26 0.00 0.00 0.05 1.01 1.37 0.33 0.03 0.00 0.00 0.01 0.55 0.33 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.15 0.31 0.16 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.13 0.39 0.33 0.15 EU KU 8 SU-N 1 SS 2MS ES EU 1MU 3 SU-N 1 SS 8 MS ES 0.00 0.00 0.02 1.56 0.16 0.00 0.00 0.00 0.03 0.01 0.61 0.00 0.00 0.00 0.00 0.00 0.02 0.64 0.56 0.31 0.09 0.01 0.06 0.16 1.14 0.96 0.03 0.00 0.00 0.01 0.10 0.61 0.48 0.00 0.00 0.00 0.00 0.00 0.75 0.70 0.09 0.00 0.02 0.07 0.10 0.91 0.45 0.00 0.00 0.00 0.00 0.00 0.36 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.21 0.42 0.48 0.11 0.00 0.00 0.05 0.98 0.88 0.07 0.00 0.08 0.02 0.08 0.81 0.32 0.00 0.00 0.03 0.03 0.05 0.76 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.17 0.41 0.56 0.18 0.00 0.00 0.01 1.25 1.46 0.21 0.00 0.02 0.03 0.15 1.26 0.60 0.00 0.00 0.06 0.06 0.08 1.22 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 O0.00 0.00 0.20 0.37 0.56 0.36 0.01 0.00 0.02 1.62 1.09 0.16 0.00 0.00 0.02 0.08 2.59 0.67 0.00 0.00 0.00 0.00 0.00 0.00, 0.00 0.00 0.00 0.00 0.00 0.00 0.33 0.32 0.55 0.49 0.00 0.01 0.06 1.54 1.08 0.09 0.00 0.03 0.06 0.11 2.04 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.18 0.28 0.31 0.00 0.00 0.06 1.16 0.91 0.28 0.00 0.01 0.05 0.05 1.73 0.39 0.00 0.00 0.00 0.01 0.05 0.63 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.06 0.01 0.02 0.00 0.00 0.00 0.00 3.06 4.44 4.41 2.80 0.05 0.05 0.11 0.69 14.81 14.24 5.21 1.61 0.28 0.28 0.48 1.22 19.73 9.88 1.09 0.28 0.02 0.20 0.00 0.00 3.06 4.44 4.41 2.80 14.71 0.00 0.00 0.10 0.11 0.69 14.81 14.24 5.21 1.61 36.72 0.06 0.01 0.48 1.22 19.73 9.88 1.09 0.28 32.95 0.01 0.05 0.09 1.25 0.05 0.00'0.00 0.01 0.13 0.09 0.94 0.00 0.00 0.00 0.14 0.37 0.65 9.70 2.66 0.03 0.00 0.14 0.37 0.65 9.70 2.66 0.03 0.00 13.55 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo I TABLE 11 continued-23-Byron Generating Station 30 ft. Wind Speed and Direction January-December, 2009 250Ft-3OFt Delta-T (F)SPEED ..................................

WIND DIRECTION CLASSES ..................................

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL---------

STABILITY CLASSES ----------

EU MU SU N SS MS ES To 00 0.01 I EU 1MU 9 SU 2 SS 4MS I ES EU T SU N 2 SS 4 MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.02 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.13 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.13 0.00 0.00, 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.08 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.11 0.02 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.03 0.24 0.01 0.00 0.00 0.00 0.00 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0.01 0.09 1.03 0.42 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.02 0.00 0.00 0.09 1.03 0.42 0.00 0.00 1.56 0.00 0.00 0.09 0.02 0.00 0.00 0.11 99.80 TOT 5.06 3.79 3.62 5.12 7.86 5.07 5.93 7.04 7.29 6.19 4.74 5.69 8.27 9.33 8.27 6.34 99.80 0.46 0.98 2.65 48.53 31.73 10.75 4.71 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.01 0.03 0.05 3.31 1.19 0.32 0.15 0.03 0.08 0.17 2.07 1.06 0.31 0.07 0.00 0.05 0.11 1.85 1.38 0.16 0.07 0.06 0.05 0.20.2.48 1.74 0.44 0.16 0.05 0.10 0.17 3.44 2.48 1.19 0.42 0.00 0.03 0.17.1.84 1.80 0.67 0.56 0.00 0.01 0.11 1.95 2.51 0.96 0.38 0.00 0.00 0.09 2.63 2.67 1.17 0.47 0.00 0.01 0.08 2.50 2.95 1.21 0.54 0.01 0.07 0.29 2.63 2.28 0.65 0.25 0.02 0.07 0.11 2.22 1.74 0.42 0.15 0.11 0.06 0.21 2.88 1.77 0.55 0.11 0.08 0.09 0.28 4.21 2.66 0.77 0.18 0.02 0.07 0.20 5.80 2.17 0.72 0.36 0.05 0.20 0.26 4.88 1.76 0.64 0.49 0.01 0.06 0.15 3.75 1.50 0.55 0.31 0.46 0.98 2.65 48.53 31.73 10.75 4.71-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.75 1.92 1.74 0.65 0.00 0.00 0.00 0.56 1.61 1.24 0.36 0,02 0.00 0.00 0.49 1.07 1.22 0.75 0.09 0.00 0.00 0.69 1.76 1.85 0.81 0.01 0.00 0.00 1.35 4.26 2.05 0.20 0.00 0.00 0.00 0.62 2.07 1.76 0.46 0.16 0.01 0.00 0.48 2.73 1.92 0.64 0.16 0.00 0.00 0.41 2.58 2.89 1.10 0.03 0.01 0.00 0.84 2.58 2.79 0.92 0.16 0.00 0.00 0.78 1.63 2.36 1.21 0.21 0.00 0.00 1.00 1.54 1.55 0.55 0.10 0.00 0.00 1.23 1.97 1.32 0.99 0.17 0.01 0.00 1.33 2.93 2.07 1.60 0.29 0.07 0.00 1.48 2.90 3.36 1.45 0.13 0.01 0.00 1.70 2.78 2.61 1.17 0.02 0.00 0.00 1.00 2.40 2.23 0.71 0.00 0.00 0.20 14.71 36.72 32.95 13.55 1.56 0.11-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo 5.5 Precipitation Monthly totals and the maximum 24-hour and maximum 1-hour precipitation amounts are summarized below. The month with the most measured precipitation was June. The month with the least measured precipitation was January*.

The maximum 24-hour total was 3.18" (June) and the maximum 1-hour total was 2.01" (June).Table 12 Precipitation Totals (Inches) -2009 Byron Site Maximum Maximum Month Total 24-hour 1 -hour January 0.65* 0.16* 0.13*February 2.06 1.16 0.34 March 6.06 2.16 0.32 April 4.90 1.33 0.34 May 4.33 1.65 0.98 June 6.60 3.18 2.01 July 3.12 0.64 0.26 August 6.49 2.72 0.61 September 2.04 1.20 0.62 October 6.44* 2.04* 0.58*November 1.10 0.48 0.13 December 3.63* 1.17* 0.19*TOTAL: 47.42'* some data are missing -actual precipitation may be under-reported Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-900o 5.6 Doses Resultinq from Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases.Unit 1: Dose gamma air (1)beta air (2)whole body (3)skin (4)organ (61 (teenager thyroid)Maximum Value 1.076 x 10"5 mrad 4.261 x 10-4 mrad 4.828 x 10-8 mrem 2.375 x 10-4 mrem 8.097 x 104 mrem Sector Affected West West Southeast West-Northwest East-Southeast Unit 2: Dose gamma air (1)beta air (2)whole body (3)skin (4)organ (5) (teenager thyroid)Maximum Value 8.559 x 10"6 mrad 2.564 x 10.5 mrad 4.892 x 10-5 mrem 1.480 x 10-5 mrem 7.996 x 104 mrem Sector Affected East-Southeast East-Southeast Southeast Southeast Southeast 01)(2)(3)14)(5)Gamma Air Dose -Finite Cloud Model; M+T ODCM Rev. 9 Beta Air Dose -Finite Cloud Model; M+T ODCM Rev. 9 Whole Body Dose -Finite Cloud Model; M+T ODCM Rev. 9 Skin Dose -Finite Cloud Model; M+T ODCM Rev. 9 Inhalation and Food Pathways Dose -Finite Cloud Model; M+T ODCM Rev. 9 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 TABLE 13 Byron Station -Unit 1 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2009 TYPE OF DOSE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER ANNUAL GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN 1.390E-06(SSE) 7.210E-O6(SSE) 6.620E-07( SE)2.870E-06(SSE) 4.250E-05(SSE) 2.OOOE-06( SE) 4.630E-06( W )6.460E-06(ESE) 1.580E-05( SE)1.050E-06( SE) 2.400E-06( SE)3.210E-06( SE) 8.B60E-06( SE)5.050E-04(ESE) 2.770E-04( SE)4.020E-06( W )4.090E-04( W )7.190E-07( S )2.300E-04(WNW) 1.O0OE-04( W )1.076E-05( W )4.261E-04( W )4.828E-06( SE)2.375E-D4(WNW) 8.097E-04(ESE)

Teenager Liver Teenager Liver Teenager Thyroid Teenager Thyroid Teenager Thyroid COMPLIANCE STATUS 10 CFR 50 APP. 1 10 CFR 50 APP.I QUARTERLY OBJECTIVE

% OF APP. I YEARLY OBJECTIVE

% OF APP. I TYPE OF DOSE GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN 5.0 10.0 2.5 7.5 7.5 0.00 0.00 0.00 0.00 0.01 10.0 20.0 5.0 15.0 15.0 0.00 0.00 0.00 0.00 0.01 Teenager Liver Teenager Thyroid Calculation used release data from the following:

Unit 1 -Vent Date of calculation:

2/19/2010 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo TABLE 13 continued Byron Station -Unit 2 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2009 TYPE OF DOSE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER ANNUAL GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN 1.670E-06(SSE) 4.940E-06(SSE) 8.530E-07( SE)2.960E-06(SSE) 1.490E-04(SSE) 9.370E-07( SE)3.570E-06(ESE) 4.790E-07( SE)1.580E-06( SE)9.640E-05(ESE) 2.750E-06( W )1.040E-05( SE)1.700E-06( SE)6.020E-06( SE)4.950E-04( SE)4.100E-06( W )1.310E-05( W )1.860E-06( SE)6.620E-06(WNW) 2.1SOE-04( W )8.559E-O6(ESE) 2.564E-05(ESE) 4.892E-06( SE)1.480E-05( SE)7.996E-04( SE)Teenager Liver Teenager Liver Teenager Thyroid Teenager Thyroid Teenager Thyroid COMPLIANCE STATUS 10 CFR 50 APP. I 10 CFR 50 APP.I QUARTERLY OBJECTIVE X OF APP. I YEARLY OBJECTIVE TYPE OF DOSE GAMMA AIR (mrad)BETA AIR (mrad)WHOLE BODY (mrem)SKIN (mrem)ORGAN (mrem)CRITICAL PERSON CRITICAL ORGAN 5.0 10.0 2.5 7.5 7.5 0.00 0.00 0.00 0.00 0.01 10.0 20.0 5.0 15.0 15.0% OF APP. I 0.00 0.00 0.00 0.00 0.01 Teenager Thyroid Teenager Thyroid Calculation used release data from the following:

Unit 2 -Vent Date of calculation:

2/19/2010 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo I I Is I I I A P N I I Io I I I I0 IMurray & Tettel, Inc. 60ooFirst Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Exelon Contract Number 80633 F4 R-26 6/08 Byron Meteorological Calibration Page 1 of 8 uLeu.: /,- /7 POWER SUPPLIES+12.000V + 2.OOOV I , v Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Loaaer_'_0 mph iI~ ,1 ,mph).,s Al- mph B. _mph Ott. mph DV mph-L-l -m ph A.V mph 0 mph qt ,6 .mph Specifications

+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+/- 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph 30'WD Expected 00 900 180" 2700 3600 Data Looqer Oý 2..4/90,0 0 °201o3 0 35T7-7 41q. JKS o 3 5-q. 7, (o Specifications

+1/ 2+1- 20+1-20+/-20+/.-2°+/- 2+1. 20+1- 20+/- 20+/- 20 250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph 250'WD 00 900 1800 2700 3600 T Lo 30' TEMP 250' TEMP A TMid 250'-30'TiHi 30' TEMP 250' TEMP A TMid 250'-30'30' TEMP 250' TEMP ATLo 250"-30'30' TEMP 250' TEMP ATHi 250"-30'Ohms 40.670 40.670 12.174 12.174 34.890 40.670 40.670 34.890 Expected 23.0*F 23.0OF 0.0 0 F 100.O 0 F I 00.0 0 F 0.0 0 F 32.0 0 F 23.O 0 F-9.O 0 F 23.0 0 F 32.0 0 F 9.0 0 F Data Loaaer zz.1q8 9 0, io 0°99. qq ' .1. 4c3 -'32~.,l 0 06 Specifications

+1- 0.1°+1/ 0.10+/- 0.10+1P0.10+1- 0.10+1- 0.10+1- 0.10+1- 0.10+/- 0.10+/- 0.10+/- 0.10+1- 0.19 S.Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, Illinois .60067 2 (847) 963-9000 ';

Exelon Contract Number 80633 F5 R-26 6/08 Byron Meteorological Calibration Page 2 of 8 Date: \7-j.7'Oi Measured Recorded Difference Specification 30' Ambient.AF AL X7C -F O__°F;,7 Z23 OF OF X 3" OF.:l0.5 0 F TOWER MEASUREMENTS

/ Ambient E- Ice Bath Temperatures 250' A T AF AL-- A.Q OF -- F-%ý oF °F+0.18°F 30' Dew Point AF AL 11.0 °F O F IS H_ LF -F qo°F -OF+/-2.7 0 F 30'AF AL WS stall "3 mph 41.3 mph Forw. WD 1,14). 0 -Revr. WD )4 H 0 -0 Tracking/wear a 9.Winds 250'AF AL 3 mph 0 mph0 h Specification 0.3mph +/- 0.45mph 300/3900 +/- 50 2100 +/- 50/Comments: I .I Aft d S 0L)1' 1`1T 0 '~7'u!S I t) riTO 0(2( 0 2 S~Murray & Trettel, Inc.

  • 6oo First Bank Drive, SuiteA .Palatine, Illinois.

600672 (847) 963-9000 F6.R-26 6/08 Byron Meteorological Calibration Page 3 of 8 Date: I- zz-d I a v Dates of Last Wind Sensor Bearing Replacements:

30'250'zz. zZ9 (6 mos.) Wind Speed:/- 2z-oi* (12 mos.) Wind Direction:

-,( --.- -L, 3 30' 250'Aspirators:

OIL I Operation of Rain Gauge: OK-Debris screen: In (9 Installed Removed i Tower Lighting Good Fair Poor Tower Condition Good Fair Poor Beacon Side lights Wiring Flasher 1:1 E F-2 E E Paint Guy wire tension Shelter condition ,E2r 11DO 1:1 E Note: AF = As Found AL = As Left-= no change (AF=AL)Calibration Instruments:

Psychrometer

-S/N -Vi-r u o14 Digital multimeter

-S/N -" 0o?.A," Digital multimeter

-S/N -FS = Full Scale Comments: 0 Signature:

-I" w Murray & Trettel, Inc.

  • 60o First Bank Drive, Suite A .Palatine, Illinois .6oo67 W (847) 963-9ooo Page 4c System Response Check ..Date: I -- -c.Z '-Site: Byron System: Digital Recorder Low Scale CH 1+/-0.4 CH2 +1 CH3:0.4 CH4 +1 CH5 +/-0.4 CH6 +/-0.18 CH7 -0.4 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts 0.c-mO V ab0c.) V l 0f V Cot V-,o 0 j V 0 ..>2 V -'001 V o L" o V Expected Response ted MPH o DEG o,;-- MPH I1 DEG -zz.03 DEG -ic, DEG -2.->, DEG o.0- IN As Found Response o, 00 t. 0 1.) Z0.. IO, Z1--As Left -Response _Mid Scale CH 1+/-0.4 CH2 +1 CH3 +/-0.4 CH4 *1 CH5 +/-0.4 CH6 +/-0.18 CH7 +/-0.4 CH1 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts v I,.qqQ v 2.,4q'p v 2.q%, v ,v.qq-1 v ,. tq-i v X. qi, v I.qjol v REsponse MPH 41..9ZEG Lj4.qj MPH 2(aI.5(.DEG 49.91 DEG "O.CI DEG q1.jy DEG IN Response t.i As Found Response jL.Cj _____0 qc.*C ,'.- -A.b.. 07Z q , As Left --. --Response Full Scale CH 1+/-0.4 CH2 11 CH3 +/-0.4 CH4 1 CH5 +/-0.4 CH6 *0.18 CH7 +/-0.4 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts k'w\ v v tA.-,, v t.AAOo, v ,.GA'o, v .'0c 1 v L.qq-1 v %,L'A v Expected Response gq,?-" MPH SS,,eDEG ý/ot MPH 5 3cq.%DEG /,j'.V DEG 9,9S DEG /2/.9)( DEG .? q) IN As Found Response 99.9 539" 9 J.2lc¶31.

'j.q /2/.9, As Left ....Response _-X--2 Q Murray & Trettel, Inc. -6oo First Bank Driue, Suite A .Palatine, Illinois .60067 2 (847) 963-9000

= M m = -.m M M M M mM- n m M 61 Page 5c System Response Check Date: ______ -__Site: Byron System: Data Logger Low Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Check Expected 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 +/-2 -22.0 +/-0.5 -10.0 +/-0.18 -22.00.5 -+/-0.01 Response _ __ _0 As Found Response ,0O, o.t Qa.' --/o.-I As Left .-.-...--Response Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250' AT 30' DP Check Expected 50.0 +/-0.4 270:+/-2 50.0 +/-0.4 270 +/-2 50.0 +/-0.5 0.0 +/-0.18 50.0 +/-0.5 Response As Found Response 5-0. O0 270.00 5-4,oO .1Q70.oo -60.04. 0t.0o 5-b. 0?As Left Response Full Scale 10MWS 1om WD 60m WS 60m WD 10m T 60m AT 10m DP Check Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.0 +/-0.5 10.0 +/-0.18 122.0 +/-0.5-Response As Found Response foo.oO 0. COIOo 5-.ioO .00 As Left --.Response ... ..is Murray & Trettel, Inc..- 600 First Bank D Uite A -Palatine, Illinois -60067 2 (847) 963-9000 6)System Response Check Page 6 Date: __Z_____Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 A- Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected Response +/- .+0.4-Z.O3

+/-0.5 -.O +/-0.18-'L-.0

+/-0.5 +/- t2 OO +/-0.4 Response As Found Response __,_____.O____-azZT...ZI.

-7At.O , .O~s As Left -O --, Response F Mid Scale Y4000 Y4001 Y4002 Y4003 , Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected Response +/-2O +/-? _O,0 +0.4 :.LOA +/-0.5 0. , +/-0.18 +/-0.5 10 +/-2 60.0 +/-0.4 As Found -0.0 5o.9 Response .As Left Response 49_9% _ _ .,_ _ ___ _ _ __ --_"" Full Scale Y4000 Y4001 Y4002 Y4003 W Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected Response te +/-2 Ic0o.o +/-0.4 iz-. +/-0.5 10.(. +/-0.18 d +/-0.5 ,5-90 -+/-2 10.C +/-0.4 As Found Response 5DO.-I1 /00. 0 /1.c "0.0 i.3 -39. Qq c)As Left -Response A .1 o C-) 7b, A N 0 -e4 S I c!406 Murray & Trettel, Inc. -6oo First Bank Drive, Suite A .Palatine, Illinois .60o67 2 (847) 963-9000 Sm --m m ----m-m -m--- -m- --61 Page 7 o System Response Check Date: I12-t f Site: Byron System: Process Computer -Y4011 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response 0 +/-0.4 0 +/-2 0,0 +/-0.4 6 +/-2 -Z.. o +/-0.5 -10.0 +/-0.18 -ZZ,c +/-0.5 0,oo +/-0.01 As Found fl---I Response ,- ..7 -.z -..As Left --Response O, _______ '-Mid Scale W Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response 50.o ' 0.4 20 + .+/-0.4 2 +/-2 50.0 +/-0.5 +/-,0 +/-0.18 57o.O +/-0.5 5"0 +/-0.01 As Found Response 2-f Z(09. ? qd ci ___._ (A. -- 4q" .S 8 As Left --Response Full Scale Y '4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected +/- O +/-0.4 +/-2 I +/-O.p +/-0.4 5 7'0 +/-2 1z2z,.) +/-0.5 1L0,J +/-0.18 /22_.O +/-0.5 /1O, +/-0.01 Response ______ ____________

As Found Response qq. 5 ." -/O.cf) i ,,O As Left It Response _ _ _ _ "-- -- -"___V j Arz- 3-Io-o q 4P Murray & Trettel, Inc. -6oo First Bank Dluite A .Palatine, Illinois .6o067 9 (847) 963-9000 R.Page 8 c System Response Check Date: I -C-'Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT ,- 30' DP Check Expected Response 0.0 +/-1.0 6.* +/-1.2 +/-.1 +5 +/-5 -Z-.,J +0.5 -o, +/-0.18 -z.Z.c- +/-0.5 As Found -, Response 0 o I .-" I ----z, .v-As Left Response -- " -- -Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT -" 30' DP Check _______ ______________

Expcted 50-O.C +/-1.2 270 +/-5 2". +/-5 ('7c +/-0.5 6,0 +/-0.18 5o.) +/-0.5 Response 0," 1 As Found 0,0 0')o Response T 1.50. ',7 1 As Left --_. .-Response -- -- _ _ "_ _ _ _ _Full Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check ___Expected Response /O0 +/-1.0 /00 +/-1.2 5LW +5 +5 i)4~o +/-0.5 (Q,) +/-0.18 JZ.O +0.5 As Found 9 g,-q"' I/13.Response q' ,uO 593 53" _____i___

.________As Left -Response Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, Illinois .60067 9 (847) 963-9000 Exelon Contract Number 80633 F4 R-26 6108 Byron Meteorological Calibration Page I of 8 POWER SUPPLIES+12.OOOV +/- 2.000V/+ .(/10 v Data I Logger System Check: Exoected 30'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph 250' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Logger 0, ' .mph 1.7(,, mph X S_ /I, mph9q3 mph& mphmph Il,7(6 mph.mph L K 9lo mph_5( mph Specifications

+/-0.4 mph+/- 0.4 mph+1- 0.4 mph+f- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+!- 0.4 mph 30' WD Expected Data Loaaer 900 q0.40 *1800 i7q, -f 270' ______360" 3 S.,oD Scpecifications

+/- 20+/.20+/- 2'+1-29+/- 21 250'WD 0°900 1800 2700 3600'9041" *3 Sq9,7 5" Specifications

+/- 0.16+/- 0.16+1- 0.10+1/-2+1- 2'+1- 2'+/-20+/- 20 T Lo 30' TEMP 250' TEMP A TMId 250'-30'T HI 30' TEMP 250' TEMP A TMId 250'-30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP ATHI 250'-30'Ohms 40.670 40.670 12.174 12.174 34.890 40.670 Expecled 23.O"F 23.0'F 0.O0F 100.0'F 100.0'F 0.06F 32.0°F 23.0°F-9.0"F Z2.qr.f 002-V -q7+1-0.1'+/- 0.1'+/-0.1'+/- 0.1'+/- 0.1'+/- 0.10+. 0.1'+1- 0.1'+/1- 0.1'40.670 34.890 23.0'F 32.0'F 9.0'F Ala..Murray & Trettel, Inc.

  • 600 First Bank Driue, Suite A .Palatine, flhinois .600671f (847) 963-9000 Exelon Contract Number 80633 F5 R-26 6/08 Byron Meteorological Calibration Page 2 of 8 Date: 5"- 6" 09 I 30' Ambient.AF AL i Measured 3-?,.0 oF OF Recorded O_____0 F OF Difference

.21 .F ___.F Specification

+/-4.50F TOWER MEASUREMENTS

' Ambient Ice Both Temoeratures 250' A T AF AL+.tO.oF O_.F.0t OF ___OF t0.18°F Winds 250' " AF AL..2 O mph O ,- mph bq 1 -11 e p 0l , -- 8 30' Dew Point AF AL_.6.D OF -- OF , Fq"FOF::2.70F Specification 0.3mph + 0.45mph 300/390 1 50 2100 1 50 30'AF AL WSstall 0-." mph 0.3 mph Forw. WD 3 6 8.7(v -a Revr. WD ;t 1 0 0 0 Tracking/wear 0.A Comments: m wm 30.W%~ WT?AM 0 (0 0 wr1K c0OL2 7. SrV 'ti) 'a U Murray & Trettel, Inc.

  • 60o First Bank Drive, Suite A .Palatine, Illinois .60067 2 (847) 963-9ooo R-26 6/08 Byron Meteorological Calibration Ur Page 3 of 8 Date: 5'-- 8-'?Dates of Last Wind Sensor Bearing Replacements:

3 30' 250'(6 mos.) Wind Speed: ,--01 g'- 0-d (12 mos.) Wind Direction:

M-dto09 (4 04 3 30' 250'Aspirators:

__ _ -.-.- _ _.I Operation of Rain Gauge: OV-4 Debris screen: In Out C Removed I Tower Lighting Good Fair Poor Tower Condition Good Fair Poor Beacon Z Paint Z 0 3 Side lights a 0 0 Guy wire tension ,O D D Wiring E 0 TJ r Flasher 0 E] 0 Shelter condition 1 rl 1'I Note: Calibration Instruments:

AF = As Found Psychrometer

-SIN -0 I AL = As Left Digital multimeter-SIN -9 I -= no change (AF=AL) Digital multimeter

-SIN -FS '= Full Scale lchnicians:

M e IL m4 b stA K .V4 -C iV tg$-3 Comments: Signature:

Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, Illinois.

6oo67 I (847) 963-9000 Page System Response Check ., Date: 't ',U Site: Byron System: Digital Recorder Low Scale CH 1,0.4 CH2 tt CH3*O.4 CH4 *1 CH5 .0.4 CH6 *0.18 CH7 :0.4 CH8 *0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts ,0OO V 000V .> VV -V a& V V -V.o0 V .0 V Expected Rexponse .MPH 0 DEG e.0 MPH O DEG -.z.on DEG Ib.oo DEG -Zz.o3 DEG b.O IN As Found Response b. 0 0 -?0 Z.2.b.As Left-Response ......Mid Scale CH 10.4 CH2*1 CH3 *0.4 CH4 *1 CH5, 0.4 CH6,10.18 CH7 *0.4 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T .250' AT 30' DP Precip volts 2.4-V v %'-)B v v 2,.-19-7 v v 2A,% v ;t.9i' v 2.-97 V Expected -MPH z'i.?6DEG Y' MPH r -GE.EG Response 2,,, f_°, MDP"DEG _,_qlG, -.008 DE 41E.q DEG .*.(90 IN As Found V7."I'Response ,, As Left .---Response -Full Scale CH 1:0.4 CH2 *1 CH3 +/-0.4 C-14*1 CH5 -0.4 CHO ,0.18 CH7 *0.4 CHO +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Volts qnIe, v 6,7,1 v 'qe v v q.t v q'.q V ,.,q, v q, pf v ,.8 v Expected Response 949,& MPH 5-3. DEG 99.9(0 MPH -.,aDEG is DEG !9' DEG /2/.?,y DEG .qqq IN As Found Response q9/i 5-qc) 9____ q___ VIP~3( 9I -Su AS Left -.Response _ _Murray & Trettel, Inc.

  • 600 First Bank Drive, Suite A .Palatine, Illinois.

6oo67 (847) 963-9000

-W -m -m M M am M Page 5 System Response Check Date:________0 O Site: Byron;ystem: Data Logger Low Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 0.0 +/-0.4 0 *2 0.0 0.4 0+/-2 .22.0 +/-0.5 -10.0 10.18 -22.0 +/-0.5 .1* +/-0.01 Response.As Found Response.

0.0 o*>. 00. -to.00 -Z.10 As Le ft -." Response Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250' AT 30' DP Chec-Expected 50.0,0.4 270:t:2 50.0 +/-0.4 270:2 50.0 +/-0.5 0.0 10.18 50.010.5 Response ... ._,., As Found Response CO5D D.7 0.O.OO S.t0 -0t).t As Left ---- ---Response , j Pull Sc0l IoWS 10m WD 60m WS 60m WD 10m T 60m AT 10m DP Expected 100.0 +/-0.4 540 +2 100.0 +/-0.4 540 +/-2 122.0 +/-0.5 10.0+/-0.18 122.0 +/-0.5 Response As Found Response (OD.6C (CC.Oc> 5'-fb.DO -ZZ.o'. (o0o /0z.OO As Left --Response Murray & Trettel, Inc. 6oo First nk .'Suite A -Palatine, Illinois -60067 2(847)963-9000 F Page 6 System Response Check Date: 0"S" Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' &T 30' DP 250' WD 250' WS Expected Response +t2 0. 0 0.4 -Zt.b +/-0.5 -io.o *0.18 -*Z.O, *0.5 a +/-2 0 .4 +/-0.4 As Found Response O,"a(P .oq -2). -.-_..-__AsLeft .. ---Response .......Nid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Checi 30' WD 30' WS 30' T 250' tAT 30' DP 250' WD 250' WS Expected *0.5 7,O 0 2 o O 0.4 Response ;7O +/-2 CD.O +/-0.4 .iv.O +/-0.5 , +/-0.18 0.+/-.0 As Found Response _______ ___. ___ _______ __ ____.___As Left Response -I Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4008 Check 30' WD 30' WS 30'T 250' tAT 30' DP 250' WD 250' WS Expected +0.5 0 ,0.18 j-Zz.o *).5 t2 160. 0 +/-0.4 Response 2 .0.4 )ZZ.o 0. 0 As Found Response " .Z.'. I. 12.(, Sto. 0 As Left -0__-Response _ _ _I Z__ ....._ _ -" Murray & Trettel, Inc. -6oo Finst Bank Drive, Suite A .Palatine, Illinois .60o67 I (8 4 7) 963-9000

-m -m- -mm- mmm m --m -m Page 7, System Response Check Date:________

Site: Byron System: Process Computer -Y4011 -Y4019 Low Sc.le Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation

==Expected Response O.o +/-0.4 0 +/-2 6. o +/-0.4 .6 +/-2 -z2.o +/-0.5 -5.o0 +/-0.18 -Z?." *0.5 c00o +/-0.01 As Found Response .2. 45 -1I. .*,I-A..-.As Left 0 Response ,I_ _ _ _ _ --Mid Sole Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Chc 30' WS 30'WD 250' WS 250' WD 30'.T 250' AT 30' DP Precipitation Expected Response ' +/-0.4 +/-2 -04 ./'0 +/-2 9,.* -0.5 , +/-0.18. , 0.5 .S. +/-0.01 As Found Response " *. 5 ,-O .O'-t H'1." As Left 0 R e s p o n s e .... ...... ...FullScale

'Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' OP Precipitation Expected Response foi)D.0 +/-0.4 £_g-.C) +/-2 IoDO +/-0.4 "0 t2 172..0 +/-0.5 i0.t +/--0.18 1-22.0 t"0.5 /O +/-0.01 As Found Response /00*" ..Il1. /0.0 A- As Left Ia. .-- ---_ResponseI

___ ___ ~ 7/7/2' 1 J 0 Murray & Trettel, Inc.. 6oo First Ban SkiteA .Palatine, Ilinois .60067 3 (847) 963-9000

-M " -" -l "o" -W Page I System Response Check Date:__-____

Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP check _ ____ ____ ___Expected , +/-1.0 c .6 +/-1.2 0 +/-5 ..+5 -Z2. 0 .0.5 -6J0. 0.18 -Z.. O 0.5 Response__

_ _ _ __ _ _ _As Found Response __ _._ ,_ , "-__.-__-

-As Left Re ponse ._- -2.I , Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check_ _ _ _ __ _ __ _ __ _ _ _ _Expected Response , +/-1.0 -1.2 25 2? +/-5 +/-0.5 o.t +/-0.18 As Found Respons, qq. _7 _.-- O.t2., As Left 5b I Response ---J- _ _ _ _ _FulScale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Expected Response *t.. *1.0 !0.0. *1.2 SL-qv *5 *5 o *0.5 /0.6 ,0.18 /Z.V 2 0.5 As Found /00 , o -z-z. .7, 7 Response As Left f- --2Z. -_-Response ,. _Murray & Trettel, Inc. -6o0 First Bank Drive, Suite A .Palatine, Iffinois 6oo67 e (847) 963-9ooo Exelon Contract Number 80633 F4 R-27 7/09 Page 1 of8 Date: q- Ioq Byron Meteorological Calibration POWER SUPPLIES+I.2.OOOV i 2.OOOV+ 13.'7qc V Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Logger 0.'30 mph I1Ia1"( mph 511. I ,mph_t 5I.3 mph'.j('mph Q 'O mph ji.71 mph mph lIS mph Specifications

+1- 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph 41- 0.4 mph Expected 30' WD 00 900 1800 2700 3600 250'WD 00 900 1800 270*3600 250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Logger go, ) 3 1'7 q. 1"- " 320,71 0 go, r0 =i 7q.% 0 36 ?7 =b Timf Specifications

+/- 0.50+/- 0.50+/- 0.180 Specifications

+/.20+/.20+1.20+/.20+1.20+1- 20+1- 2°+1- 20+/- 2 T Lo 30' TEMP 250' TEMP ATMId 250'-30'T Hi 30' TEMP 250' TEMP A TMId 250'.30'30' TEMP 250' TEMP ATLo 250'-30'3 30' TEMP 250'TEMP A THi 250"-30'Ohms 40.670 40.670 Expected 23.0*F 23.0 0 F 0.0 0 F 12.174 12.174 34.890 40.670 1 00.0*F I 00.0 0 F I0.O 0 F O.OOF 32.0 0 F 23.0F-9.00F Data Lo-aer 0 QýL-0 0, ej. (14 -IM-00.0 qq .QS j 01-8.fi1Li.+/-. 0+/- 0.50+/-0.180+/-0.50+1- 0.50+1- 0.180 40.670 34.890 23.0 0 F z22.16 0 +*-0.5=32.0OF 30oi -0 +1-0.50 9.OO o +/. 0.180 9.0°F t,=401 8. qo 9 6oo First Bank Drive, Suite A .Palatine, Illinois .60067 2 (847) 963-90o0 0.4)1 Murray & Trettel, Inc.

  • Exelon Contract Number 80633 F5 R-27 7/09 Byron Meteorological Calibration Page 2 of 8 Date: q -Dq Measured Recorded Difference Specification 30' Ambient.AF AL 92.OF __OF/43°F -OF j.-7 F -OF+/-I0.50F TOWER MEASUREMENTS SAmbient 0Ile Bath Temperatures
  • 250' A T AF AL O, O0°F -F ,.el oF -°F_0.1 OFF+/-0.180F 30' Dew Point AF *AL j...°F '-f'7 °F 9 0 F O. F 7 OF i OF+/-12.70F 30'AF AL WSstall 0,3 mph ._ mph Forw. WD a -0 Revr. WD 0 a Tracking/wear

.4 K Winds 250'AF AL O3 mph (' mph 0OK.Specification 0.3mph +/- 0.45mph 300/390o t 50 2100 +/- 50 I Comments:

P. I Al Q 21/ (c-I Murray & Trettel, Inc.

  • 600 Frst Bank Drive, Suite A Palatine, Illinois.

60067 I (847) 963-9ooo R-27 7/09 Byron Meteorological Calibration

  • Page 3 of 8 De" Dates of Last Wind Sensor Bearing Replacements:

30'(6 mos.) Wind Speed: (12 mos.). Wind Direction:

250'30'b lL_250'Aspirators:

Operation of Rain Gauge: O1(" Debris screen: (&1" Out Installed Removed Tower Lighting Good Fair Poor I Beacon .0 1 :1 l F Side lights 2 r-] El Wiring 0 rl ] El Flasher 2 --1 ,l rower Condition Paint 3uy wire tension 3helter condition Good Fair Poor 000D 00El 000 Note: AF =AL =As Found As Left no change (AF=AL)Calibration Instruments:

Psychrometer

-S/N --.Digital multimeter

-S/N -Digital multimeter

-SIN -FS = Full Scale rechnicians:

..4IJ MEw-Lbl/'A, Comments: t' " I' Ir " " !Signature: , 6 Murray & Trettel, Inc. 6o0 First Bank Drive, Suite A Palatine, Illinois.

6o067 ' (847) 963-9ooo

---__ ..F System Response Check Page 4 Date: _-_- __Site: Byron System: Digital Recorder Low Scale CH 1+/-0.4 CH2 *1 CH3-0.4 CH4 *1 CH5 0-.5 CH6 to0.18 CH7 +/-0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 0.00 MPH 0.00 DEG 0.00 MPH 0.00 DEG -22.00 DEG -10.00 DEG -22.00 DEG 0.00 IN Response ,__As Found Response 0.0 0 0-0 0 -Z .D3 1 '0- C ZZ-03 O. 0 As Left -.- -Response Mid Scale CH 1+/-0.4 CH2 +/-1 CH3 +/-0.4 CH4 *1 CH5 +/-0.5 CH6 L0.18 CH7 :0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.00 MPH 270.00 DEG 50.00 MPH 270.00 DEG 50.00 DEG 0.00 DEG 50.00 DEG 0.50 IN Response As Found Lj*1 Y9. q ;Z"( 705(Response Y ' I' I As Left .. " ---Response Full Scale CH 1+/-0.4 CH2*1 CH3 +/-0.4 CH4+/-1 CH5 +/-0.5 CH6 L0.18 CH7 -0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 100.00 MPH 540.00 DEG 100.00 MPH 540.00 DEG 122.00 DEG 10.00 DEG 122.00 DEG 1.00 IN Response As Found 9q4 Response $'c ____ ____ ____As Left ..... -Response Murray & Trettel, Inc.- 600 First Bank Drive, Suite A .Palatine, Illinois .60067 I (847) 963-90o0

---m m --m -System Response Check Page Date: i-O9 Site: Byron System: Data Logger Low Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Check Expected 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 +/-2 -22.0 +/-0.5 -10.0 +/-0.18 -22.0 +/-0.5 +/-0.01 Response .....As Found 0 6 o DO 0 Response OO 6.DO t. 6 , -.ZZ ,/?.D, D -, As Left .. -Response Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250' AT 30' DP Check _Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270 +/-2 50.0 +/-0.5 0.0 +/-0.18 50.0 +/-0.5 Response ....As Found Response 5"O ,70 (X 5")" ) 270, ) b).- C.6)As Left --Response__

Full Scale lOin WS 10m WD 60m WS 60m WD 10m T 60m AT 10m DP Check Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.0 +/-0.5 10.0 +/-0.18 122.0 +/-0.5 Response _As Found Response '52 ,0 5"16. b' Lo2,z>)JQ, L i l22 As Left -. .Response)OL q-rri -0c Murray & Trettel, Inc. -600 First Bank Suite A -Palatine, Illinois -60067 2 (847) 963-9000 System Response Check Page Date:_______

Site: Byron System: Process Computer -Y4000 -Y4006 Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected Response +/--LJO *2 /0J0.o +/-0.4 /ZZ.L) +/-0.5 Io. +/- ,0.18 /2Z-.O *0.5 5`-( +/-2 /t2.0 *0.4 As Found Response __2z_ _5______ 122, _____,- _ _ .___._As Left --. IS -Response ATh q)c-eq Murray & Trettel, Inc. -6oo First Bank Drive, Suite A -Palatine, Illinois -6o067 9 (847) 963-9ooo mm --mm m --m --_= m m in F Page 7 System Response Check-0 q.Site: Byron System: Process Computer -Y4011 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' nT 30' DP Precipitation Expected Response 0 _ +0.4 .:t2 .O +/-0.4 +/-2 .-Z?- +/-0.5 -p0.0 *0.18 -ZZ +/-0.5 .+/-0.01 As Found Response -(p --ZZ.o .' 1- Z.4 As Left -" -- -Z2." Response ... Z2 Z Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AiT 30' DP Precipitation Expected Response +/-0.4 Z,; 70 +/-0.4 Z-V<.) +/-2 +/-0.5 D..0 +/-0.18 5-- 0.5 +/-0.01 As Found Response qqiq 44A1'- ______ '-li- q As Left ct.-Response L q Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation ExpectedI Response (00. +/-0.4 +/--LC. +/-2 Oc)0 +/-0.4 5'LlO +/-2 /Z.Z, +/-0.5 , 0.18 +/-lj.. +/-0.5 O.OQ +/-0.01 As Found Response /jO. I .qqi " .i. o i Z .6S 1,0.0 As Left --- -Response-Adbk- Az'z- '?,)s -OL?w Murray & Trettel, Inc. -600 First Bank PW uite A .Palatine, Illinois .60067 2 (847) 963-9000 System Response Check Page Date:_____

Site: Byron System: Control. Room Indicators Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' ZST 30' DP Check _Expected Response _5 + +/-1.2 t+/-5 5 .*0.5 .L) +/-0.18 +/-- .+0.5 As Found LIq.- Llq -Response V? '___As Left ....Response Murray & Trettel, Inc. -6oo First Bank Drive, Suite A -Palatine, Illinois -6o067 W (847) 963-9ooo (I rd el", I I- a 1.111 Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station 2010 prepared for Exelon Nuclear Warrenville, IL 60555 by Murray and Trettel, Incorporated 600 First Bank Drive, Suite A Palatine, IL 60067 (847) 963-9000 e-mail: mt@weathercommand.com For Exelon Use Onil Reviewed By: I Date: I .Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 I Table of Contents Section Descrition Paae List of Tables .....................................................................................

ii 1 Introduction

.............................................................................................

1 2 Sum m ary ............................................................................................

2 3 Data Acquisition

................................................................................

3 4 Data Analysis .....................................................................................

5 5 Results ..............................................................................................

10 Site Calibration logs ...................................................................

Appendix Murray & Trette[, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9o00 ii List of Tables Number Description Page 1 Instrument Locations

..........................................................................

4 2 Data Loggers ....................................................................................

4 3 W ind Direction Classes ....................................................................

7 4 W ind Speed Classes .........................................................................

7 5 Atmospheric Stability Classes ..........................................................

8 6 Data Recovery Summary .................................................................

11 7 W ind Rose, January-March 2010 ...................................................

14 8 W ind Rose, April-June 2010 ..........................................................

16 9 W ind Rose, July-September 2010 ...................................................

18 10 W ind Rose, October-December 2010 ...........................................

20 11 W ind Rose, January-December 2010 ...........................................

22 12 Precipitation Totals .........................................................................

24 13 Maximum Doses Resulting From Airborne Releases .....................

25 Murray & Trettel, Inc. 6o0 First Bank Drive, Suite A Palatine, J7linois 60067 (847) 963-9ooo Introduction The purpose of the meteorological program being conducted at the Byron Station site is to provide information sufficient to assess the local weather conditions and to determine the degree of atmospheric dispersion of airborne radioactive effluent from the station.The meteorological tower is 250 ft. high and is instrumented at two levels. Wind speed and direction are measured at 30 ft. and 250 ft. Ambient temperature is measured at 30 ft. Differential temperature, referenced to 30 ft., is measured at 250 ft. Dew point temperature is measured at 30 ft. Precipitation is measured at approximately 3 ft.Joint frequency stability wind rose tables of wind direction, wind speed, and stability are routinely tabulated from hourly measurements.

The quarterly and annual tables are included in this report.Descriptions of the instruments and digital recorder are given in Section 3 (Data Acquisition) of this report. Data reduction and processing are described in Section 4 (Data Analysis).

The results given in Section 5 of this report include modeled maximum whole body doses, skin doses, organ doses based upon airborne releases, and site meteorology.

Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 6oo67 (847) 963-9000 2. Summary The Byron Station meteorological monitoring program produced 52,482 hours0.00558 days <br />0.134 hours <br />7.969577e-4 weeks <br />1.83401e-4 months <br /> of valid data out of a possible 52,560 parameter hours during 2010 (365 days x 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s/day x 6 measured priority parameters), which represents an overall data recovery rate of 99.9%. Priority parameters are all parameters except dew point temperature and precipitation.

The stability wind rose tables included in this report have been generated using the 30 ft.wind data with the 250-30 ft. differential temperature data.The maximum annual calculated cumulative doses resulting from airborne releases were as follows.Unit 1: gamma air dose beta air dose whole body dose skin dose organ (child bone)4.080 x 10a mrad 5.300 x 10"e mrad 7.675 x 10"2 mrem 5.230 x 10a mrem 3.767 x 10"1 mrem Unit 2: gamma air dose beta air dose whole body dose skin dose organ (child bone)4.870 x 1O 4 mrad 5.730 x lO"mrad 7.812 x 10"2 mrem 6.090 x lO mrem 3.762 x 10"1 mrem Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 3. Data Acquisition Wind speed and direction are measured with Climatronics F460 wind sensors. The wind speed sensors have a starting speed of 0.5 mph (0.22 mps), a range of 0 to 100 mph (0 to 44.7 mps), and a system accuracy of +/-1.0 mph at 100 mph (*0.45 mps at 44.7 mps). The wind direction sensors have a threshold speed of 0.5 mph (0.22 mps), a range of 0 to 5400, and a system accuracy of +/-50.Ambient and differential temperatures are measured with the Climatronics 100093 system. Ambient temperature is measured within the range of -22 to 1220F (-30.0 to 45.0°C) with an accuracy of +/-O.5 0 F (+0.3 0 C). Differential temperature is measured within the range of -10.0 to 10.0 0 F (-5.6 to 5.6 0 C) with an accuracy of +/-0.18 0 F (+/-0.10°C).

Dew point temperature is measured with the Climatronics 101197 system. Dew point temperature is measured with the range of -22 to 122 0 F (-30.0 to 45.0°C) with an accuracy of +/-2.7°F (1.5 0 C).Precipitation is measured with a Climatronics 100097-1 tipping bucket rain gauge and is measured in increments of one one-hundredth of an inch with a system accuracy of+/-0.01" (+/-0.25mm).

Instrument types and locations are summarized in Table 1.The meteorological data are collected and stored by a Campbell Scientific CR1000 Data Logger. The Campbell Scientific CR1000 measures the analog voltages of the instruments and records the digital equivalent within the range of 0 to +5 volts. Data are obtained from the Campbell Scientific CR1000 by a direct dial telephone hookup to an in-house computer system.As a backup to the CR1000, data are also recorded with a Johnson Yokogawa Corp. digital recorder (JYC DA100 data acquisition unit). Data are sampled every 10 seconds.Data loggers are summarized in Table 2.0 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Table 1 Instrument Locations Measurement Wind Speed Wind Direction Differential Temperature Wind Speed Wind Direction Ambient Temperature Dew Point Temperature Precipitation Sensor Type Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 1001197 Climatronics 100097-1 Location Tower Tower Tower Tower Tower Tower Tower Ground Elevation 250 ft.250 ft.250 ft.30 ft.30 ft.30 ft.30 ft.3 ft.Table 2 Data Locar Sampling Frequency Measurement Winds, Temperatures, and Precipitation Winds, Temperatures, and Precipitation Logoer TYDS Campbell Scientific CR1000 Johnson Yokogawa Corp. Digital Recorder (JYC DA100 and Contec IPC-PTIM300(PC)WOU) digital recorder I sec.10 sec.Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9ooo 4. Data Analysis The Byron data logger is routinely interrogated to obtain hourly average data. The data are then stored in the meteorological data base and listings of the data are generated.

The data listings are examined by qualified personnel and any apparent problems are brought to the atterition of the Project Manager or Meteorological Technician and the Instrument Maintenance staff.Hourly values of wind speed, wind direction, ambient temperature, differential temperature, dew point temperature, and precipitation are obtained through measurements taken at the site. The standard deviation of wind direction (sigma) is derived. The wind direction variation is described in terms of the standard deviation of the direction about the mean direction.

The CR1000 computes an hourly value of wind sigma by taking the Root-Mean-Square (RMS) of the four quarter-hour wind sigma values. The quarter-hour wind sigma values are calculated directly from the one second wind direction samples during the 15 minute period.The data base files are edited approximately once a week. Missing data logger values are replaced with digital recorder values, when available.

Invalid data are deleted from the data base.When an hourly value is missing or invalid, the numeral 999 is entered into the computer data file in the appropriate location.

When the wind direction changes substantially relative to its short term fluctuations, the numeral 888 can be entered into the wind sigma location to indicate shifting winds. When the wind blows with velocities near the sensing threshold of the instrument, the numeral 777 can be entered into the wind direction, wind speed, and wind sigma locations to indicate light and variable winds.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 A professional meteorologist reviews the data, calibration findings, equipment maintenance reports, and other information and determines which data are valid. Only the valid data are retained in the data base.As a quality control measure, a monthly comparison is made of Microtel and digital recorder data. An investigation is made into the reasons for any significant differences between the sets of values.Joint frequency stability wind rose tables of hourly data measured at the site are generated.

These tables indicate the prevailing wind direction, wind speed, and stability classes measured during the period of observation as well as the joint frequencies of occurrence of the wind direction, wind speed, and stability classes. The values are also used as input to the atmospheric transport and diffusion models. Wind direction, wind speed, and stability classes are given in Tables 3, 4, and 5.Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-gooo Table 3 Wind Direction Classes IF IF IF IF IF IF IF IF IF IF IF IF IF IF IF IF 348.750 < WD <11.250 < WD <33.750 < WD <56.250 < WD <78.750 < WD <101.250 < WD <123.750 < WD <.146.250 < WD <168.750 < WD <191.250 < WD <213.750 < WD <236.250 < WD <258.750 < WD <281.250 < WD <303.750 < WD <326.250 < WD <11.250 THEN Class is 33.750 THEN Class is 56.250 THEN Class is 78.750 THEN Class is 101.250 THEN Class is 123.750 THEN Class is 146.250 THEN Class is 168.750 THEN Class is 191.250 THEN Class is 213.750 THEN Class is 236.250 THEN Class is 258.750 THEN Class is 281.250 THEN Class is 303.750 THEN Class is 326.250 THEN Class is 348.750 THEN Class is N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Table 4 Wind Speed Classes IF 0.0 mph < WS < 0.5 mph THEN Class is IF 0.5 mph < WS < 3.5 mph THEN Class is IF 3.5 mph < WS < 7.5 mph THEN Class is IF 7.5 mph < WS _< 12.5 mph THEN Class is IF 12.5 mph < WS < 18.5 mph THEN Class is IF 18.5 mph < WS < 24.5 mph THEN Class is IF 24.5 mph < WS THEN Class is 1 2 3 4 5 6 7 s Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 6oo67 (847) 963-9000 Table 5 Atmospheric Stability Classes Differential Temperature Interval Class (in °C/100m) (1)Differential Temperature Interval (in OF over the 250-30 ft. interval)

(2)Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable-1.9 <-1.7 <-1.5 <-0.5 <1.5 <4.0 <AT AT AT AT AT AT AT-1.9-1.7-1.5-0.5 1.5 4.0-2.3 <-2.1 <-1.9 <-0.7 <1.8 <4.8 <AT AT AT AT AT AT AT-2.3-2.1-1.9-0.7 1.8 4.8"' from ANSIIANS 2.5=12 ANSIIANS 2.5 intervals scaled for instrument heights on the Byron meteorological tower Murray & Trettel, Inc. 6oo PFrst Bank Driue, Suite A Palatine, Illinois 60067 (847)963-900o The following two programs were used to calculate doses resulting from radioactive releases: 1. XOQDOQ: Computer Program for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations (NUREG/CR-2919).

The program is based on the theory that material released to the atmosphere will be normally distributed (Gaussian) about the plume centerline.

A straight-line trajectory is assumed between the point ofrelease and all receptors.

The program implements the assumptions outlined in Section C of NRC Regulatory Guide 1.111. In evaluating routine releases from nuclear power plants, it primarily is designed to calculate annual relative effluent concentrations, X/Q values and annual average relative deposition, D/Q values.Output from the XOQDOQ program is used as input to the GASPAR program.2. GASPAR I1: A Code System for Evaluation of Radiological Impacts Due to the Release of Radioactive Material to the Atmosphere During Normal Operation of Light Water Reactors (NUREG-0597).

GASPAR is a program written for the evaluation of radiological impacts due to the release of radioactive material to the atmosphere during normal operation of reactors.

The GASPAR code implements the radiological impact models of NRC Regulatory Guide 1.109, Revision 1, for atmospheric releases.

The program is used to estimate the maximum individual doses at selected locations in the vicinity of the plant 0 Murray & Trettel, Inc. 600 First Bank Drive, S~uite A Palatine, Illinois 60067 (847) 963-90o0 5. Results 5.1 Instrument Maintenance The maintenance program followed during 2010 was composed of routinely scheduled visits and equipment repairs. Routine site visits were made to inspect the sensing and recording systems for proper operation.

In addition, routine maintenance and calibration checks of all tower-mounted and ground level equipment were performed every four months. A description of the calibration and field procedures is found in the Murray and Trettel, Inc. "P1009 Procedures Manual" (July 2010).During the January calibration, the heat pads were inspected and found to be not heating up properly.

On the next day, the heat pads were re-inspected..

All connections were checked and the heat pads were operating normally.In February, the digital recorder was unreachable by modem. The unit was rebooted.In April, a stuck tipping bucket in the rain gauge was repaired.In May, the annual tower inspection was performed.

Also in May, a lightning strike damaged surge protection for some process computer points as well as surge protection for a shelter phone line. In addition, the tipping bucket in the rain gauge was cleaned and re-aligned.

In July, the data logger modem was damaged. A new modem was installed.

Also in July, the surge protection for the digital recorder phone line was replaced due to damage.In August, damage to phone lines in and around the met shelter was repaired.No other significant problems were encountered with the equipment, and at the end of the year, no problems were evident at the site.Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9000 5.2 Data Recovery The record of data recovery for the year is summarized in Table 6.Table 6 Byron Site Data Recovery Summary 2010 Recovered Elevation Hours Recovered Percent Lost Hours Percent Changed Measurement Wind Speed Wind Speed Wind Direction Wind Direction Ambient Temperature Differential Temperature Dew Point Temperature Precipitation 30 ft.250 ft.30 ft.250 ft.30 ft.250-30 ft.30 ft.3 ft.8747 8747 8747 8747 8747 8747 8747 8680 99.9 99.9 99.9 99.9 99.9 99.9 99.9 99.1 13 13 13 13 13 13 13 80 0.6 0.2 1.3 0.6 0.1 0.3 0.9 1.1 AVERAGE*99.9* average of priority parameters (all except dew point temperature and precipitation)

Valid Hours Lower Level Joint Frequency

% 8747 Upper Level Joint Frequency

% 8747 Recovered Percent 99.9 99.9 Lost Hours 13 13 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 .5.3 Summary of Billin-gs for Equipment Repairs, Replacement Parts, and Other Work not Included in Fixed-Cost Maintenance Agreement

-2010 Description

-Byron Cost January Meteorological equipment maintenance Meteorological parts, materials, and contractor services February Meteorological equipment maintenance Meteorological parts, materials, and contractor services March Meteorological parts, materials, and contractor services Special Request Meteorological equipment maintenance Meteorological parts, materials, and contractor services May Meteorological equipment maintenance Meteorological parts, materials, and contractor services June Meteorological equipment maintenance JuNV Meteorological equipment maintenance Meteorological parts, materials, and contractor services Auos Meteorological equipment maintenance Meteorological parts, materials, and contractor services Special Request September Meteorological equipment maintenance Meteorological parts, materials, and contractor services October Meteorological equipment maintenance November Meteorological parts, materials, and contractor services December Meteorological parts, materials, and contractor services$ 687.40 43.96 110.00 248.30 276.46 320.00 27.50 447.92 1,151.40 363.88 0.00 861.00 46.68 1,174.00 164.71 240.00 137.50 158.16 0.00 0.00 0.00 Annual Total:$ 6,458.87 Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847) 963-9o00 5.4 Stability Wind Rose Data The quarterly and annual stability wind roses are given in Tables 7 through 11. Wind speed classes have been altered to reflect the sensor threshold.

For the year,'winds measured at 30 ft. most frequently came from the west-northwest (9.20%) and fell into the 3.6-7.5 mph and 7.6-12.5 mph wind speed classes (37.79% and 30.98% respectively).

Calms (wind speeds at or below the sensor threshold) were measured 0.17% of the time. Speeds greater than 24.5 mph were measured 0.13% of the time.Stability based on the 250-30 ft. differential temperature most frequently fell into the neutral classification (45.08%).Murray & Trettel, Inc. 600 First Bank Driue, Suite A Palatine, Illinois 60067 (847) 963-9000 TABLE 7-14-Byron Generating Station 30 ft. Wind Speed and Direction January-March.

2010 250Ft-30Ft Oelta-T (F)of Observations

-2149 Values are Percent Occurrence SPEED ----------------------------------

WINO DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE s SSW SW N W w M N NNW TOTAL---------

STABILITY CLASSES ----------

EU MU SU N SS MS ES TOTAL EU MU CSU A N LSS ES EU MU lKJ 1 SU-N 3 S MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.33 0.14 0.19 0.05 0.00 0.00 0.00 1.63 0.84 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.23 0.09 0.05 0.00 0.00 0.00 0.70 0.60 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.19 0.09 0.05 0.00 0.00 0.00 0.93 0.56 0.00 0.00 0.00 0.05 0.00 0.74 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.14 0.19 0.00 0.00 0.00 0.00 0.51 0.51 0.09 0.00 0.00 0.05 0.00 0.65 0.74 0.14 0.00 0.00 0.00 0.00 0.65 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.33 0.28 0.23 0.19 0.00 0.00 0.00 1.21 0.65 0.23 0.33 0.00 0.00 0.05 1.26 0.23 0.09 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.19 0.05 0.00 0.00 0.00 0.05 0.65 0.65 0.14 0.09 0.00 0.05 0.05 1.21 0.70 0.42 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.33 0.14 0.05 0.00 0.00 0.00 0.00 1.02 0.65 0.28 0.00 0.00 0.05 0.14 1.16 0.65 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.14 0.05 0.05 0.00 0.00 0.00 0.47 0.37 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.14 0.00 0.05 0.00 0.00 0.00 0.37 0.28 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.19 0.14 0.05 0.00 0.00 0.00 0.70 0.09 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.23 0.05 0.00 0.00 0.00 0.51 0.47 0.37 0.05 0.00 0.00 0.00 0.88 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.37 0.37 0.00 0.00 0.00 0.00 0.65 0.65 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.51 0.33 0.93 0.42 0.00 0.00 0.00 1.26 1.30 0.98 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.74 0.88 0.51 0.00 0.00 0.00 2.79 2.65 0.33 0.00 0.00 0.00 0.00 2.23 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.28 0.37 0.47 0.93 0.05 0.00 0.00 2.19 2.14 0.56 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.19 0.23 0.19 0.00 0.00 0.05 1.12 1.44 0.28 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 4.19 3.91 4.19 2.56 0.05 0.05 0.00 0.09 16.71 13.87 4.05 0.84 0.00 0.00 0.23 0.51 24.15 7.58 1.49 0.14 0.00 0.00 0.09 0.79 11.63 2.14 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.19 3.91 4.19 2.56 14.89 0.00 0.09 16.71 13.87 4.05 0.84 35.60 EU MU 8 SU-N 1 SS 2 MS ES EU IMU 3 SU-N 1 SS 8145 0.00 0.00 0.00 3.77 0.60 0.05 0.00 0.00 0.00 0.14 0.93 0.14 0.00 0.00 0.00 0.09 1.49 0.33 0.23 0.00 0.00 0.00 0.00 0.47 0.51 0.42 0.00 0.00 0.00 0.00 0.00 0.51 0.00 0.00 0.05 0.00 0.23 0.09 0.00 0.00 0.00 0.05 0.09 0.56 0.23 0.00 0.00 0.00 0.00 0.56 1.02 0.00 0.00 0.00 0.00 0.00 1.26 0.33 0.00 0.00 0.00 0.00 0.05 0.79 0.00 0.00 0.00 0.00 0.14 2.14 0.05 0.00 0.00 0.00 0.00 0.00 3.26 0.65 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.05 2.84 0.88 0.00 0.00 0.00 0.00 0.00 1.07 0.00 0.00 0.23 0.51 24.15 7.58 1.49 0.14 34.11 0.00 0.00 0.09 3.16 0.00 0.00 0.00 0.00 0.09 1.35 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.37 0.70 0.09 0.00 0.00 0.05 0.05 0.42 0.05 0.00 0.00 0.19 0.33 0.09 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.05 0.09 1.72 0.00 0.00 0.00 0.00 0.00 0.33 0.00 0.00 0.09 0.79 11.63 2.14 0.14 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 14.80 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, filinois 60067 (847)963-9ooo TABLE 7 continued-15-Byron Generating Station 30 ft. Wind Speed and Direction January-March, 2010 250Ft-3OFt Delta-T (F)SPEED ----------------------------------

WIND DIRECTION CLASSES ..................................

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NiNW TOTAL.........

STABILITY CLASSES ----------

EU MU SU N SS MS ES TOTAL EU IMU 9 SU-N 255 4KS ES EU G NJ T SU N 2SS 41MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.56 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.56 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 TOT 8.98 7.35 4.61 3.96 5.17 5.58 5.17 3.58 2.47 3.5B 3.30 4.84 10.56 10.98 11.26 8.61 100.00 0.09 0.33 1.44 57.24 27.50 9.87 3.54 100.00 Wind Direction by Stability j N NNE NE ENE E ESE SE SSE S SSW SW WSW W WW NW NNW TOTAL 0.00 0.00 0.14 6.65 1.72 0.42 0.05 0.00 0.00 0.19 5.58 1.16 0.37 0.05 0.00 0.05 0.09 3.30 1.02 0.09 0.05 0.00 0.05 0.00 2.05 1.44 0.42 0.00 0.00 0.00 0.05 2.84 1.16 0.56 0.56 0.00 0.05 0.09 2.33 2.23 0.70 0.19 0.00 0.05 0.19 2.56 1.86 0.51 0.00 0.00 0.00 0.00 1.16 1.54 0.84 0.05 0.00 0.09 0.09 1.44 0.74 0.05 0.05 0.00 0.00 0.19 1.77 1.40 0.14 0.09 0.00 0.00 0.00 1.63 0.98 0.60 0.09 0.00 0.00 0.05 2.93 1.35 0.51 0.00 0.00 0.05 0.28 6.14 1.68 1.91 0.51 0.00 0.00 0.00 5.72 3.54 1.21 0.51 0.09 0.00 0.00 5.91 3.16 1.02 1.07 0.00 0.00 0.09 5.21 2.51 0.51 0.28 0.09 0.33 1.44 57.24 27.50 9.87 3.54-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WiN NW NNW TOTAL 0.00 0.70 2.65 4.42 1.21 0.00 0.00 0.00 0.60 1.35 2.14 3.26 0.00 0.00 0.00 0.60 1.49 1.07 1.44 0.00 0.00 0.00 0.56 1.12 1.58 0.70 0.00 0.00 0.00 1.02 2.42 1.68 0.05 0.00 0.00 0.00 0.33 1.58 2.51 1.16 0.00 0.00 0.00 0.51 1.95 2.14 0.56 0.00 0.00 0.00 0.47 1.21 1.40 0.51 0.00 0.00 0.00 0.42 0.70 0.37 0.93 0.05 0.00 0.00 0.56 0.84 1.58 0.60 0.00 0.00 0.00 0.56 1.40 1.26 0.09 0.00 0.00 0.00 0.98 1.44 1.58 0.84 0.00 0.00 0.00 2.19 3.63 2.33 1.86 0.56 0.00 0.00 2.51 5.77 2.37 0.33 0.00 0.00 0.00 2.09 5.07 3.91 0.19 0.00 0.00 0.00 0.79 2.98 3.77 1.07 0.00 0.00 0.00 14.89 35.60 34.11 14.80 0.60 0.00-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 nph 18.6 -24.5 mph* 24.5 mph 0)Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo TABLE 8-16-Byron Generating Station 30 ft. Wind Speed and Direction April-June.

2010 25OFt-3OFt Delta-T (F)Number of Observations

-2174 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW' WNW W NNW TOTAL.........

STABILITY CLASSES ----------

EU 4U SU N SS MS ES TOTAL EU MU CSU A N LSS M HS ES EU MU I SU-N 3 SS MS ES-N 7 55 MS ES EU MU 8 SU-N 1 SS 2MH ES EU 3 SU-N I SS 811 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.14 0.37 0.09 0.00 0.00 0.05 1.38 1.24 0.14 0.00 0.05 0.29 0.23 0.87 0.69 0.00 0.00 0.00 0.00 0.05 0.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.28 0.23 0.00 0.00 0.00 0.00 0.97 0.60 0.14 0.00 0.00 0.14 0.18 1.29 0.37 0.00 0.00 0.00 0.00 0.05 0.60 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.32 0.05 0.00, 0.00 0.00 0.05 0.64 0.60 0.05 0.00 0.00 0.09 0.09 0.87 0.51 0.05 0.00 0.00 0.00 0.05 0.41 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.18 0.14 0.00 0.00 0.00 0.05 0.74 0.55 0.00 0.00 0.00 0.05 0.05 1.16 0.92 0.05 0.00 0.00 0.00 0.00 0.64 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.37 0.32 0.05 0.00 0.00 0.14 2.35 1.99 0.97 0.05 0.05 0.37 0.09 1.89 1.10 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.18 0.32 0.05 0.00 0.00 0.09 0.92 0.69 0.41 0.28 0.00 0.00 0.09 0.92 1.38 0.23 0.00 0.00 0.00 0.00 0.69 0.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.18 0.00 0.00 0.00 0.00 0.74 0.83 0.51 0.05 0.00 0.00 0.00 0.32 1.06 0.09 0.05 0.00 0.00 0.14 0.74 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.37 0.00 0.00 0.00 0.00 0.97 0.83 0.51 0.05 0.00 0.00 0.05 1.33 1.61 0.69 0.05 0.00 0.00 0.00 0.23 0.55 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.37 0.14 0.00 0.00 0.09 0.55 1.15 0.64 0.09 0.00 0.00 0.05 1.47 1.01 0.51 0.00 0.00 0.00 0.00 0.64 0.87 0.05 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.28 0.23 0.00 0.00 0.00 0.60 0.74 0.32 0.00 0.00 0.00 0.23 1.61 1.33 0.09 0.00 0.00 0.00 0.14 0.64 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.14 0.00 0.00 0.00 0.64 1.01 0.41 0.00 0.00 0.00 0.18 1.38 0.64 0.00 0.00 0.00 0.05 0.23 0.46 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.46 0.09 0.05 0.00 0.00 0.00 0.51 0.60 0.05 0.00 0.00 0.00 0.05 0.55 0.46 0.00 0.00 0.05 0.09 0.09 0.23 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.23 0.18 0.09 0.00 0.00 0.00 0.60 1.01 0.18 0.00 0.00 0.05 0.09 0.64 0.64 0.00 0.00 0.14 0.05 0.18 0.97 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.51 0.41 0.32 0.00 0.00 0.00 0.78 0.87 0.05 0.00 0.00 0.00 0.18 1.56 0.69 0.05 0.00 0.00 0.00 0.05 1.38 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.41 0.37 0.55 0.00 0.05 0.00 0.69 0.87 0.09 0.00 0.00 0.00 0.05 1.15 0.32 0.00 0.00 0.09 0.14 0.00 0.64 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.28 0.32 0.28 0.00 0.00 0.14 1.52 0.78 0.14 0.00 0.00 0.00 0.00 0.87 0.14 0.00 0.00 0.14 0.09 0.05 0.23 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.00 2.21 3.96 4.14 1.98 0.00 0.00 0.05 0.60 14.58 14.35 4.60 0.51 0.09 0.09 0.97 1.61 17.89 12.88 1.75 0.09 0.41 0.41 0.41 1.01 9.06 3.13 0.14 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.14 0.00 0.00 2.21 3.96 4.14 1.98 12.28 0.05 0.60 14.58 14.35 4.60 0.51 34.66 0.97 1.61 17.89 12.88 1.75 0.09 35.28 0.41 1.01 9.06 3.13 0.14 0.00 14.17 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo TABLE 8 continued-17-Byron Generating Station April-June.

2010 30 ft. Wind Speed andDirection 250Ft-3OFt Delta-T (F)SPEED ----------------------------------

W IND DIRECTION CLASSES ----------------------------------

STABILITY CLASSES ..........

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 9 SU-N 2 SS 4HS ES EU G MU TSU N 2 SS 4S ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00-0.05 0.00 0.100 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.64 0.05 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.28 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.18 0.00 0.05 2.39 0.51 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.00 0.00 0.00 0.00 0.05 2.39 0.51 0.00 0.00 3.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.00 0.00 0.00 0.18 99.86 TOT 6.21 4.92 4.09 4.65 10.35 7.73 5.11 7.64 8.74 7.18 5.61 3.86 5.75 7.19 5.47 5.24 99.86 0.69 1.43 3.31 46.32 34.91 10.63 2.58 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W M NW NN TOTAL 0.05 0.28 0.32 2.90 2.07 0.51 0.09 0.00 0.14 0.23 2.90 1.29 0.37 0.00 0.00 0.09 0.18 2.12 1.56 0.14 0.00 0.00 0.05 0.09 2.67 1.66 0.18 0.00 0.05 0.37 0.23 4.83 3.50 1.29 0.09 0.00 0.00 0.18 3.17 3.08 0.97 0.32 0.00 0.00 0.14 1.89 2.21 0.78 0.09 0.00 0.00 0.05 2.67 3.17 1.66 0.09 0.00 0.00 0.18 3.54 3.22 1.56 0.23 0.00 0.00 0.37 3.27 2.62 0.69 0.23 0.00 0.05 0.41 2.62 1.84 0.55 0.14 0.05 0.09 0.14 1.70 1.70 0.14 0.05 0.32 0.09 0.32 2.62 1.93 0.37 0.09 0.00 0.00 0.23 4.00 2.12 0.51 0.32 0.09 0.18 0.05 2.53 1.61 0.46 0.55 0.14 0.09 0.18 2.85 1.24 0.46 0.28 0.69 1.43 3.31 46.32 34.91 10.63 2.58-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW N NNW TOTAL 0.00 0.83 2.81 2.12 0.46 0.00 0.00 0.00 0.55 1.70 1.98 0.69 0.00 0.00 0.00 0.51 1.33 1.61 0.60 0.05 0.00 0.00 0.46 1.33 2.21 0.64 0.00 0.00 0.00 1.20 5.47 3.50 0.18 0.00 0.00 0.00 0.83 2.39 2.62 1.10 0.78 0.00 0.00 0.28 2.12 1.52 1.10 0.09 0.00 0.00 0.55 2.35 3.73 0.87 0.14 0.00 0.00 0.78 2.53 3.04 1.56 0.74 0.09 0.00 0.55 1.66 3.27 1.29 0.37 0.05 0.00 0.41 2.07 2.21 0.78 0.14 0.00 0.00 0.74 1.15 1.06 0.64 0.28 0.00 0.00 0.64 1.79 1.43 1.33 0.51 0.05 0.00 1.47 1.70 2.48 1.47 0.05 0.00 0.00 1.38 1.70 1.52 0.87 0.00 0.00 0.00 1.10 2.58 1.01 0.55 0.00 0.00 0.14 12.28 34.68 35.28 14.17 3.13 0.18-WIND SPEED CLASSES-CAL H< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 eph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60o67 (847)963-9ooo TABLE 9-18-Byron Generating Station 30 ft. Wind Speed and Direction July-Septffer.

2010 25OFt-3OFt Delta-T (F)Number of Observations

-2202 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ..................................

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL---------

STABILITY CLASSES ----------

EU MJ SU N SS MS ES TOTAL EU IJ CSU A N LSS ES EU I Su-N 3 SS MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.36 0.23 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.27 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.23 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.36 0.36 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.54 0.45 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.23 0.18 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.41 0.09 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.54 0.23 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.59 0.41 0.77 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.82 0.77 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.86 0.73 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.14 0.73 0.50 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.77 1.09 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.41 0.64 0.77 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.91 0.45 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.41 0.36 0.23 0.00 0.00 0.05 0.05 0.14 0.18 0.09 0.00 0.00 0.00 0.00 0.00 2.86 8.67 6.90 3.45 0.05 0.05 0.14 0.18 0.09 0.00 0.50 0.00 0.00 2.86 8.67 6.90 3.45 21.89-N 7 SS MS ES EU 1'gJ 8 SU-N 1SS 2MS ES EU 3 SU.N 1 SS 8Sms ES 0.05 0.09 0.05 1.32 1.00 0.36 0.09 0.05 0.05 0.05 0.45 0.14 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.05 0.05 0.00 1.14 0.45 0.05 0.05 0.05 0.09 0.05 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.36 0.05 0.00 0.00 0.05 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.45 0.54 0.14 0.00 0.00 0.05 0.00 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.18 0.00 1.27 0.59 0.73 0.54 0.95 1.04 0.09 0.36 0.00 0.23 0.00 0.05 0.00 0.09 0.05 0.09 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 1.04 0.77 1.63 0.59 0.00 0.09 0.09 0.32 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.18 1.00 1.68 0.68 0.00 0.00 0.05 0.45 0.86 0.54 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 1.04 2.04 1.91 0.68 0.00 0.00 0.36 2.50 2.91 0.18 0.05 0.00 0.00 0.00 0.23 0.50 0.00 0.00 0.05 0.00 0.09 1.73 1.27 0.36 0.05 0.14 0.09 0.23 2.00 1.23 0.09 0.00 0.00 0.00 0.00 0.82 0.73 0.00 0.00 0.00 0.05 0.14 1.41 0.91 0.27 0.00 0.00 0.14 0.27 1.41 0.27 0.00 0.00 0.00 0.00 0.05 0.23 0.14 0.00 0.00 0.00 0.05 0.05 1.27 1.09 0.14 0.05 0.09 0.00 0.09 0.73 0.23 0.00 0.00 0.00 0.00 0.09 0.23 0.05 0.00 0.00 0.00 0.00 0.18 1.36 0.91 0.45 0.00 0.09 0.09 0.09 0.41 0.59 0.05 0.00 0.05 0.00 0.00 0.36 0.09 0.00 0.00 0.00 0.00 0.00 1.09 1.00 0.32 0.00 0.00 0.05 0.23 1.23 0.41 0.00 0.00 0.09 0.09 0.09 0.36 0.00 0.00 0.00 0.18 0.05 0.23 1.68 0.86 0.27 0.09 0.23 0.05 0.23 0.91 0.05 0.00 0.00 0.00 0.09 0.00 0.05 0.00 0.00 0.00 0.09 0.05 0.09 1.36 1.63 0.59 0.05 0.14 0.14 0.00 0.41 0.18 0.00 0.00 0.00 0.00 0.05 0.14 0.00 0.00 0.00 0.41 0.41 0.54 1.18 18.12 15.12 10.22 2.77 1.00 1.00 0.91 1.82 11.17 7.40 0.86 0.14 0.14 0.14 0.18 0.32 2.45 1.50 0.00 0.00 0.54 1.18 10.12 15.12 10.22 2.77 48.37 0.91 1.82 11.17 7.40 0.86 0.14 23.30 0.18 0.32 2.45 1.50 0.00 0.00 4.59 Murray & Trettel, Inc. 600 First Bank Driue, Suite A Palatine, Illinois 60067 (847) 963-9o00 TABLE 9 continued-19-Byron Generating Station 30 ft. Wind Speed and Direction July-Septeffber.

2010 250Ft-30Ft Delta-T (F)SPEED..................................

WIND DIRECTION CLASSES---------

STABILITY CLA!SSES ..............

SS MS ES TOTAL*CLASS N NHE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU NJ1 SU N EU 9 SU-N 2 SS 4NS ES EU G U T SU N 2 SS 4MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.05 0.00 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.32 0.05 0.14 0.18 0.18 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.18 0.18 0.00 0.00 0.86 0.00 0.00 0.00 0.00 0.00 0.00 0.00 TOT 4.68 2.82 1.18 2.32 4.72 3.77 5.68 7.72 14.40 11.04 7.36 5.86 7.54 7.08 6.77 6.09 99.50 1.86 1.73 3.50 34.92 33.06 18.07 6.36 99.50 Wind Direction by Stability I N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNWTOTAL 0.09 0.14 0.14 2.09 1.50 0.59 0.14 0.09 0.14 0.05 1.54 0.73 0.23 0.05 0.00 0.05 o0o0 0.27 0.73 0.14 0.00 0.00 0.09 0.05 0.64 1.00 0.50 0,05 0.00 0.14 0.18 1.54 1.27 1.41 0.18 0.23 0.09 0.09 0.73 0.91 1.23 0.50 0.00 0.09 0.14 1.45 1.36 1.73 0.91 0.00 0.00 0.05 1.68 2.41 2.45 1.14 0.00 0.00 0.45 3.91 6.04 2.50 1.50 0.18 0.09 0.32 4.72 4.22 1.23 0.27 0.00 0.18 0.45 3.36 2.18 1.00 0.18 0.18 0.05 0.27 2.36 2.09 0.64 0.27 0.36 0.14 0.27 2.59 2.36 1.59 0.23 0.09 0.14 0.41 3.09 2.04 1.09 0.23 0.41 0.18 0.45 2.72 1.82 0.73 0.45 0.23 0.18 0.14 2.09 2.23 0.95 0.27 1.86 1.73 3.50 34.92 33.06 18.07 6.36-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extreoely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S 55W SW WSW W WiN NW NNW TOTAL 0.00 0.91 2.95 0.73 0.09 0.00 0.00 0.00 0.73 1.77 0.32 0.00 0.00 0.00 0.00 0.41 0.59 0.18 0.00 0.00 0.00 0.00 0.86 1.23 0.23 0.00 0.00 0.00 0.00 1.32 3.36 0.05 0.00 0.00 0.00 0.00 0.59 2.59 0.59 0.00 0.00 0.00 0.00 0.91 4.09 0.68 0.00 0.00 0.00 0.00 1.18 4.54 2.00 0.00 0.00 0.00 0.00 1.91 5.77 5.99 0.73 0.00 0.00 0.00 2.00 3.54 3.77 1.54 0.18 0.00 0.00 2.09 2.77 2.09 0.41 0.00 0.00 0.00 1.59 2.63 1.14 0.36 0.14 0.00 0.00 2.36 2.91 1.32 0.50 0.45 0.00 2.04 2.41 1.91 0.64 0.09 0.00 1.82 3.36 1.45 0.14 0.00 0.00 1.18 3.86 0.86 0.18 0.00 0.50 21.89 48.37 23.30 4.59 0.86-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 Mh 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph 0.00 0.00 0.00 0.00 0.00 Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9ooo TABLE 10-20-Byron Generating Station 30 ft. Wind Speed and Direction October-December.

2010 250Ft-3OFt Delta-T (F)Nunber of Observations

-2196 Values are Percent Occurrence SPEED -.........................

WIND DIRECTION CLASSES ----------------------------------

STABILITY CLASSES ..........

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU HU SU N SS KS ES TOTAL EU MU C SU A N L SS M S ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU MU 1 SU-N 35S MS ES EU-N 7 SS HS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU MU 8 SU-N 1 55 2 NS ES EU 3 SU-N 1 SS 8MS ES 0.23 0.23 0.23 0.05 0.00 0.00 0.18 0.50 1.05 0.41 0.00 0.09 0.05 0.14 2.14 0.68 0.14 0.00 0.00 0.09 0.09 0.64 0.00 0.00 0.00 0.00 0.27 0.09 0.05 0.00 0.00 0.00 0.41 0.27 0.00 0.00 0.00 0.05 0.09 0.27 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.09 0.14 0.05 0.00 0.00 0.00 0.32 0.55 0.14 0.00 0.00 0.00 0.00 0.23 0.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.46 0.18 1.09 0.00 0.27 0.09 0.14 0.09 0.32 0.41 0.23 0.14 0.05 0.09 0.32 0.00 0.00 0.00 0.55 0.36 0.18 0.05 0.00 0.05 0.09 0.14 0.00 0.00 0.00 0.32 0.05 0.18 0.09 0.18 0.14 0.14 0.23 0.00 0.00 0.00 0.14 0.59" 0.82 0.50 0.00 0.05 0.00 0.68 0.00 0.00 0.00 0.41 0.73 0.87 0.73 0.00 0.09 0.18 0.41 0.00 0.00 0.00 0.05 0.82 0.68 0.32 0.09 0.23 0.27 0.59 0.00 0.14 0.00 0.32 1.64 0.41 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.18 0.14 0.05 0.18 0.23 0.36 0.32 0.18 0.14 0.27 0.82 0.68 0.09 0.59 0.77 0.64 0.96 0.41 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 1.55 2.87 3.73 6.10 0.14 0.14 0.59 0.59 8.83 13.80 6.06 2.41 0.77 0.77 0.41 0.64 16.85 10.20 1.46 1.05 1.55 0.00 0.00 0.05 0.00 0.00 0.00 0.05 2.87 3.73 6.10 14.25 0.00 0.05 0.09 0.19 0.55 0.59 0.14 0.00 0.00 0.14 0.00 0.77 1.68 0.14 0.09 0.09 0.14 0.09 1.41 1.23 0.41 0.05 0.00 0.00 0.00 0.59 0.23 0.05 0.00 0.00 0.00 0.00 0.27 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.64 0.46 0.27 0.18 0.50 0.00 0.14 0.18 0.00 0.09 0.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 1.05 0.82 0.96 2.09 1.41 0.68 0.55 0.32 0.09 0.32 0.14 0.00 0.05 0.05 0.00 0.77 0.19 0.00 0.00 0.00 0.00 0.00 0.77 0.46 0.00 0.00 0.32 0.09 0.09 0.87 0.41 0.00 0.00 0.00 0.05 0.23 1.96 0.14 0.00 0.00 0.18 0.05 0.00 1.73 0.68 0.00 0.00 0.14 0.09 0.14 2.28 0.36 0.00 0.00 0.05 0.05 0.09 2.96 0.77 0.00 0.00 0.00 0.00 0,18 1.96 0.05 0.00 0.00 0.00 0.05 0.05 1.55 1.59 0.59 0.18 0.05 0.05 0.05 1.59 0.73 0.00 0.00 0.00 0.00 0.05 0.14 0.05 0.00 0.00 0.00 0.00 0.05 0.09 0.91 1.37 0.82 0.09 0.05 0.05 0.14 1.50 0.87 0.00 0.00 0.05 0.00 0.14 0.77 0.00 0.00 0.00 0.59 8.83 13.80 6.06 2.41 32.42 0.41 0.64 16.85 10.20 0.59 1.46 1.05 31.38 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.50 0.05 0.00 0.00 0.00 0.00 0.00 0.36 0.50 0.00 0.00 0.00 0.00 0.00 1.00 1.78 0.00 0.00 0.00 0.00 0.00 0.82 0.64 0.09 0.00 0.00 0.00 0.09 0.97 0.64 0.00 0.00 0.18 0.18 0.23 0.91 12.34 5.05 0.09 0.00 0.23 0.91 12.34 5.05 0.09 0.00 19.81 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9o00 TABLE 10 continued-21-Byron Generating Station 30 ft. Wind Speed and Direction October-Oecember, 2010 250Ft-3OFt Delta-T (F)SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SWWSW W WNW ' W NNW TOTAL---------

STABILITY CLASSES ----------

EU MU SU N SS MS ES TOTAL EU I1MU 9 SU-N 2SS 41M5 0.00 0.00 0.00 0.36 0.00 0.00 0.00 0.00 0.00 D.00 0.00 o.0o 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.41 0.09 0.00 0.00 0.00 0.00 0.27 0.00 0.00 0.00 0.05 0.05 0.36 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.00 0.00 0.00 0.00 0.05 0.05 2.23 0.41 0.00 0.05 0.05 2.23 0.41 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 00 0.00 2.73 EU G U T SU N 2 SS 4MS ES 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.00 0.00 0.00 0.00 0.00 0.32 0.00 0.00 0.00 0.32 99.95 TOT 7.29 1.78 1.78 2.32 3.55 3.64 3.46 9.74 7.74 6.06 6.60 7.15 10.52 11.57 8.79 7.92 99.95 1.09 1.28 2.19 42.12 32.33 11.38 9.56 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W " NW NNW TOTAL.0.09 0.14 0.41 3.87 1.96 0.77 0.05 0.00 0.05 0.09 0.68 0.82 0.09 0.05 0.00 0.00 0.00 0.55 0.91 0.27 0.05 0.00 0.00 0.00 1.23 0.87 0.14 0.09 0.00 0.00 0.00 0.82 1.68 0.68 0.36 0.00 0.00 0.00 2.09 0.68 0.41 0.46 0.00 0.00 0.00 1.18 1.09 0.46 0.73 0.00 0.00 0.00 2.37 4.83 1.50 1.05 0.00 0.00 0.00 2.05 2.87 1.28 1.55 0.00 0.00 0.14 2.00 2.23 0.96 0.73 0.05 0.18 0.00 2.41 2.60 0.68 0.68 0.36 0.23 0.50 3.87 1.32 0.27 0.59 0.32 0.32 0.18 5.46 2.96 0.41 0.87 0.14 0.18 0.36 6.56 2.41 1.23 0.68 0.05 0.09 0.14 3.42 2.69 1.28 1.14 0.09 0.09 0.36 3.55 2.41 0.91 0.50 1.09 1.28 2.19 42.12 32.33 11.39 9.56-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW W NNW TOTAL 0.00 0.73 2,14 3.23 0.82 0.36 0.00 0.00 0.41 0.68 0.64 0.05 0.00 0.00 0.00 0.27 1.00 0.50 0.00 0.00 0.00 0.00 0.36 0.46 0.87 0.64 0.00 0.00 0.00 1.05 1.96 0.55 0.00 0.00 0.00 0.00 0.59 1.14 1.05 0.55 0.32 0.00 0.00 0.27 0.64 1.64 0.87 0.05 0.00 0.00 0.68 2.05 4.01 2.78 0.23 0.00 0.00 0.73 2.73 2.69 1.55 0.05 0.00 0.00 0.68 1.87 1.78 1.59 0.14 0.00 0.00 1.18 2.60 1.05 1.23 0.50 0.05 0.00 1.05 1.59 1.78 2.37 0.27 0.09 0.00 1.41 2.82 2.64 3.01 0.46 0.18 0.00 2.00 3.42 3.92 2.19 0.05 0.00 0.00 2.09 4.01 2.46 0.23 0.00 0.00 0.00 0.73 3.32 2.60 0.96 0.32 0.00 0.05 14.25 32.42 31.38 18.81 2.73 0.32-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 nph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-90o0 TABLE 11-22-Byron Generating Station 30 ft. Wind Speed and Direction January-Decenber.

2010 2SOFt-3OFt Delta-T (F)Nunber of Observations

-8721 Values are Percent Occurrence SPEED ..................................

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NWN NW TOTAL.........

STABILITY CLASSES ----------

EU mU SU N 55 ms ES TOTAL EU 14U C SU A N L SS'I S ES EU KU I SU-N 3 SS mS ES-N 7 SS KS ES EU mU 8 SU-N I SS 2HS ES EU 3 SU-N 1 SS 81S ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.26 0.22 0.25 0.06 0.01 0.02 0.07 1.20 1.03 0.28 0.02 0.05 0.09 0.10 1.80 0.53 0.05 0.00 0.00 0.02 0.08 0.50 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.26 0.15 0.02 0.01 0.01 0.00 0.80 0.40 0.06 0.01 0.01 0.07 0.10 0.79 0.23 0.06 0.00 0.00 0.00 0.03 0.93 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.21 0.09 0.02 0.00 0.00 0.01 0.52 0.52 0.06 0.00 0.00 0.05 0.02 0.46 0.30 0.01 0.00 0.00 0.00 0.03 0.44 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.28 0.19 0.38 0.19 0.36 0.01 0.14 0.00 0.00 0.01 0.03 0.02 0.08 0.47 1.32 0.45 1.11 0.06 0.61 0.02 0.15 0.00 0.01 0.03 0.09 0.01 0.03 0.62 0.86 0.49 0.40 0.06 0.02 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.39 0.05 0.10 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.16 0.16 0.13 0.00 0.01 0.03 0.68 0.56 0.45 0.19 0.06 0.02 0.06 0.71 0.60 0.19 0.05 0.00 0.00 0.00 0.39 0.29 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.17 0.10 0.11 0.00 0.00 0.01 0.78 0.57 0.65 0.18 0.00 0.03 0.06 0.56 0.60 0.10 0.14 0.00 0.00 0.05 0.29 0.29 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.25 0.19 0.16 0.00 0.00 0.00 0.69 0.70 0.85 0.31 0.00 0.00 0.02 0.83 1.27 0.55 0.11 0.00 0.00 0.00 0.31 0.71 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.23 0.19 0.41 0.00 0.00 0.05 0.60 1.05 0.87 0.38 0.00 0.01 0.10 1.26 1.36 0.25 0.05 0.00 0.01 0.02 0.56 0.56 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.29 0.34 0.23 0.01 0.00 0.02 0.77 0.73 0.34 0.10 0.03 0.02 0.13 1.28 1.07 0.07 0.00 0.00 0.00 0.10 0.67 0.49 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.34 0.34 0.24 0.00 0.05 0.03 0.72 1.01 0.37 0.03 0.01 0.05 0.11 1.11 0.37 0.00 0.00 0.00 0.01 0.07 0.39 0.16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.44 0.28 0.22 0.01 0.03 0.06 0.75 0.73 0.11 0.01 0.10 0.02 0.06 0.85 0.36 0.00 0.00 0.01 0.03 0.11 0.80 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.26 0.39 0.62 0.38 0.00 0.03 0.05 1.00 1.23 0.44 0.05 0.07 0.05 0.08 1.23 0.49 0.01 0.00 0.08 0.05 0.10 1.33 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 0.56 0.72 0.42 0.02 0.03 0.02 1.51 1.43 0.28 0.01 0.01 0.02 0.13 2.00 0.50 0.01 0.00 0.02 0.02 0.08 1.01 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.14 0.50 0.49 0.70 0.06 0.03 0.07 1.53 1.36 0.38 0.10 0.07 0.02 0.08 1.72 0.44 0.00 0.00 0.02 0.06 0.01 0.25 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.26 0.25 0.28 0.02 0.02 0.09 1.23 1.31 0.46 0.06 0.05 0.05 0.05 1.40 0.52 0.00 0.00 0.05 0.02 0.06 0.55 0.01 0.00 0.00 0.00 0.00 0.01 0.01 0.05 0.07 0.03 0.00 0.01 0.01 0.00 0.00 2.69 4.86 4.75 3.53 0.15 0.15 0.30 0.62 14.55 14.29 6.25 1.64 0.47 0.47 0.63 1.15 17.48 9.52 1.39 0.36 0.18 0.18 0.23 0.76 8.85 2.96 0.09 0.00 0.01 0.05 0.07 0.03 0.00 0.17 0.00 0.00 2.69 4.86 4.75 3.53 15.85 0.01 0.30 0.62 14.55 14.29 6.25 1.64 37.79 0.63 1.15 17.46 9.52 1.39 0.36 30.98 0.23 0.76 0.85 2.96 0.09 0.00 13.07 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 TABLE 11 continued-23-Byron Generating Station 30 ft. Wind Speed and Oirectlon----------------------------------

WIND DIRECTION CLASSES January-December.

2010 250Ft-3OFt Delta-T (F)............

.........

STABILITY CLASSES ----------

NW NNW TOTAL EU MU SU N SS MS ES TOTAL SPEED CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW EU 1MU 9 SU-N 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.03 0.00 0.00 0.01 0.17 0.00 0.00 0.00 0.13 0.00 0.00 0.00 0.14 0.02 0.00 0.01 0.14 0.10 0.02 0.02 0.33 0.00 0.00 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 2 SS 0.00 0.00 0.00 4 MS 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.02 0.05 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.13 0.02 0.07 1.34 0.28 0.00 0.00 0.00 0.00 0.00 0.01 0.11 0.00 0.00 0.00 0.28 0.07 1.34 0.02 0.00 0.00 1.83 EU GMU T SU N 2 55 4MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.01 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.11 0.00 0.00 0.00 0.13 99.83 TOT 6.78 4.20 2.90 3.30 5.94 5.17 4.85 7.19 8.37 6.98 5.73 5.44 8.59 9.20 8.06 6.96 99.83 0.94 1.19 2.61 45.08 31.97 12.51 5.53 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WS W WNW NW NN TOTAL.0.06 0.14 0.25 3.86 1.81 0.57 0.08 0.02 0.08 0.14 2.66 1.00 0.26 0.03 0.00 0.05 0.07 1.55 1.05 0.16 0.02 0.00 0.05 0.03 1.64 1.24 0.31 0.03 0.01 0.13 0.11 2.50 1.90 0.99 0.30 0.06 0.03 0.09 2.08 1.72 0.83 0.37 0.00 0.03 0.11 1.77 1.63 0.87 0.44 0.00 0.00 0.02 1.97 2.99 1.62 0.58 0.00 0.02 0.18 2.74 3.23 1.35 0.84 0.05 0.02 0.25 2.95 2.63 0.76 0.33 0.01 0.10 0.22 2.51 1.90 0.71 0.28 0.15 0.09 0.24 2.72 1.62 0.39 0.23 0.25 0.15 0.26 4.20 2.24 1.07 0.42 0.06 0.08 0.25 4.84 2.52 1.01 0.44 0.16 0.11 0.16 3.63 2.32 0.87 0.80 0.11 0.09 0.19 3.42 2.10 0.71 0.33 0.94 1.19 2.61 45.08 31.97 12.51 5.53-STABILITY CLASSES-Extremely Unstable'Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SW WS W WNW NNW TOTAL 0.00 0.79 2.64 2.61 0.64 0.09 0.00 0.57 1.38 1.26 0.99 0.00 0.00 0.45 1.10 0.84 0.50 0.01 0.00 0.56 1.03 1.22 0.49 0.00 0.00 1.15 3.30 1.43 0.06 0.00 0.00 0.58 1.93 1.69 0.70 0.28 0.00 0.49 2.20 1.49 0.63 0.03 0.00 0.72 2.55 2.79 1.04 0.09 0.00 0.96 2.95 3.04 1.19 0.21 0.00 0.95 1.98 2.60 1.26 0.17 0.00 1.07 2.21 1.65 0.63 0.16 0.00 1.09 1.71 1.39 1.05 0.17 0.00 1.65 2.79 1.93 1.67 0.49 0.00 2.01 3.31 2.67 1.16 0.05 0.00 1.85 3.53 2.33 0.36 0.00 0.00 0.95 3.19 2.05 0.69 0.08 0.17 15.65 37.79 30.98 13.07 1.83-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.01 0.01 0.02 0.06 0.00 0.00 0.00 0.13 Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9ooo 5.5 Precipitation Monthly totals and the maximum 24-hour and maximum 1-hour precipitation amounts are summarized below. The month with the most measured precipitation was July. The month with the least measured precipitation was February*.

The maximum 24-hour total was 5.37" (July) and the maximum 1-hour total was 1.24" (July).Table 12 Precipitation Totals (Inches) -2010 Byron Site Maximum Maximum Month Total 24-hour 1 -hour January 0.89* 0.60* 0.14'February 0.64* 0.23* 0.06 March 1.62 0.44 0.16 April 2.65 0.72 0.24 May 5.381 2.36* 0.85*June 7.04 1.44 0.57 July 9.91 5.37 1.24 August 4.08 1.79 0.76 September 2.39* 0.46' 0.35*October 3.23 1.44 0.71 November 1.42 0.85 0.21 December 1.38" 0.31' 0.12'TOTAL: 40.63*some data are missing -actual precipitation may be under-reported Murray & Trettel, Inc. 6oo PFrst Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo 5.6 Doses Resulting from Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases.Unit 1: Dose gamma air)beta air (2)whole body (3)skin (4)organ (5) (child-bone)

Maximum Value 4.080 5.300 7.675 5.230 3.767 X x x x x 10.a mrad 10"6 mrad 10.2 mrem 10.8 mrem 10-1 mrem Sector Affected South-Southeast South-Southeast South-Southeast South-Southeast South-Southeast

% of Appendix I Unit 1 Compliance Status 10 CFR 50 Appendix I Yearly Objective gamma air beta air whole body skin organ 10.0 20.0 5.0 15.0 15.0 mrad mrad mrem mrem mrem 0.00 0.00 1.54 0.00 2.51 Unit 2: Dose gamma air (1)beta air (2)whole body (3)skin (4)organ (5) (child-bone)

Maximum Value 4.870 x 10'0 mrad 5.730 x 10a mrad 7.812 x 10.2 mrem 6.090 x 10.6 mrem 3.762 x 10"1 mrem Sector Affected South-Southeast South-Southeast South-Southeast South-Southeast South-Southeast

% of Appendix I 0.00 0.00 1.56 0.00 2.51 Unit 2 Compliance Status 10 CFR 50 Appendix I Yearly Objective gamma air beta air whole body skin organ 10.0 20.0 5.0 15.0 15.0 mrad mrad mrem mrem mrem 1)(2)(3)(4)(6)Gamma Air Dose -GASPAR II, NUREG-0597 Beta Air Dose -GASPAR II, NUREG-0597 Whole Body Dose -GASPAR It. NUREG-0597 Skin Dose -GASPAR II, NUREG-0597 Inhalation and Food Pathways Dose -GASPAR II, NUREG-0597 Murray & Ti-ettel, Inc. 6oo First Bank Drive, Suite A Palatine, llinois 60067 (847)963-9ooo APPENDIX Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo Exelon Contract Number 80633 F4 R-27 7/09 Byron Meteorological Calibration Page 1 of 8 Date: I /v.)POWER SUPPLIES+12.000V

  • 2.000V+15,16. v Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57mph Data Loomer Specificabons
0. ý,mph I .7Ch mph ,I.la- mph__mph_____.mph_____,mph____mph A s t11 mph 4ý'o9& mph IL"'% mph+1- 0.4 mph 4/- 0.4 mph+/- 0.4 mph+/- 0.4 mph+/-0.4 mph+1- 0.4 mph+1- 0.4 mph+/- 0.4 mph+1-0.4 mph+1- 0.4 mph 30' WD Expected Data Logger 00 _0. _-_906 01 1800 t '0.o'1 0 2700 2__q__3600 35'9,7&, Specifications

+/-20+I-20+- 20+/- 2*+/- 2*250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph 250' WD 00 90" 1800 2700 360" 190.11 IgOo63-4/-20+1- 2"+1-20+/"20 T Lo 30' TEMP 250' TEMP ATMid 250'-30'T HI 30' TEMP 250' TEMP ATMId 250-30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP ATHi 250'-30'Ohms 40.670 40.670 Expected 23.0*F 23.0OF 0.0OF 12.174 12.174 34.890 40.670 40.670 34.890 100.0"F 1 00.0*F 0.0 0 F 32.O 0 F 23.0 0 F-9.0 0 F 23.0 0 F 32.O0F 9.0 0 F Data Loaicier 22-99.A jq.0V10 qq* 07 0.05, 06 3,A1.Sriecifications

+/- 0.5*+1- 0.50+1- 0.50+1- 0.180+/-0.50+1- 0.50+1- 0.180+/- 0.5"+1- 0.50+1- 0.18*-JL ;) _WN-- I ()Murray & Trettel, Inc..6oo First Bank Drive, Suite A .Palatine, Illinois.

60067 2 (847) 963-9000 Exelon Contract Number 80633 F5 R-27 7/09 Byron Meteorological Calibration Page 2 of 8 Date: -I Z-0/O 30' Ambient.AF AL Measured :11".7 °F "_ °F Recorded " *4°F O -F Difference

64. OF " O°F Specification i0.5F TOWER MEASUREMENTS V1Ambient

[:] lee Bath Temperatures 250' A T AF AL A O__.F -OF UAglO F OF-F "__F*0.18°F 30' Dew Point AF AL 13.-W oF -OF I.04 °F -°F 1.1._F °F*2..7°F 30'AF AL WS stall O.mph Forw. WD 30 " Revr. WD ,..Tracking/wear Winds 250'AF AL' _*mpI r __ __-3 mph 312. 311 O.1L° l*Smecification 0.3mph 1 0.45mph 300/3900 150 2100

  • 50 M Comments: w w 5 wb W6#MT 00 ts8 M-r 19?,I I I NSrAeIJE 2.5m 1 W% Mr "TV"7 iReAOcPfi3 us MT 6I10 IAJS77411ch W)O MT 01 &Nll Murray & Trettel, Inc.. 600 First Bank Drive, Suite A .Palatine, Illinois.

60067 2 (847) 963-9000 F6 R-27 7109 Byron Meteorological Calibration Page 3 of 8 Date: -Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 mos.) Wind Speed: -" / !12-/47 (12 mos.) Wind Direction:

/" / 2.(D I /" 30' 250'Aspirators:

DI (- ___" Operation of Rain Gauge: 1g..-Debris screen: In 0 Installed Removed Tower Lighting Good Fair Poor Tower Condition Good Fair Poor Beacon Side lights Wiuing Flasher DO 2YooO Paint Guy wire tension Shelter condition o2 Co Do[21" D Note: AF = As Found AL = As Left-= no change (AF=AL)FS = Full Scale rechnicians:

M -kr. /MIatJ I*Calibration Instruments:

Psychrometer-SIN- " I -QYC 14-10 Digital multimeter

-S/N -Y3121 wir ove Digital multimeter

-SIN -01,4A X _ _ __ _Comments: Me~'r R~ tier kIi~i~u~k~

Wi IZepiwi~ ,qS,4P-2 )exr Pol oid n- kIPN i)R- 9 #.2 Heff- I A&of ',kf tAn$~' ~ r ~.c'3OI~9 &MM~-r ~.itr ~ (~iw I-'Signature:

w Murray & Trettel, Inc.. 6oo First Bank Drive, Suite A .Palatine, Illinois .60067 3 (847) 963-9000 F R-'7/(System Response Check Page 4 of Date: / -/1-P Site: Byron System: Digital Recorder Low Scale CH 1,0.4 CH2 :1 CH3*0.4 CH44 1 ClIS ,0.5 C1-16 10.10 -CH7 *0.5 CHO tO.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 0.00 MPH 0.00 DEG 0.00 MPH 0.00 DEG -22.00 DEG -10.00 DEG -22.00 DEG 0.00 IN Response .. _ ...As Found Response O.0> 0. 0.0 C) -2.1LiA -I0.0-6 -V e. 60.0 As Left Response_Mid Scale CH 1+0.4 CH2*1 CH3 -0.4 CH4 *1 CH5 0.5 CH6*0-.18 CH7 *0.5 CHS +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.00 MPH 270.00 DEG 50.00 MPH 270.00 DEG 50.00 DEG 0.00 DEG 50.00 DEG 0.50 IN Response As Found Response 7.0 -o.412 .4 4 0 .As Left ." Response -" " Full Scale C'CH 1U0.4 CH2,1 CH3 -0.4 CH4 -1 CHS *0.5 CHO .0.18 CH7 +/-0.5 CH8 *0.01 Checlk 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 100.00 MPH 540.00 DEG 100.00 MPH 540.00 DEG 122.00 DEG 10.00 DEG 122.00 DEG 1.00 IN Response As Found Response 5-__~ 9 I.I S31~ (21-41 91.97 J2J.I 1-00 As Left --I Response .....krIL-~()Murray & Trettel, Inc. -6oo First Bank Drive, Suite A .Palatine, Illinois.

60067 2 (847) 963-9000 F R-2 7/0 Page 5 of System Response Check Date:I-/Z 1-to1 Site: Byron System: Data Logger I.ow Scale 30' WS 30' WO 250' WS 250' WD 30' T 250' AT 30' DP Precip ,Check Expected 0.0+/-0.4 0 +/-2 0.0*0.4 0+/-2 -22.0+/-0.5

-10.0+/--0.18

-22.0+/-0.5

.10 -0.01 ResponseI As Found Response O.b 0 .-ti..c -l.o -7.t..cr .1 AsLeft .... .Response MidScale 30' WS 30 WD 250' WS 250' WD 250' T 250' AT 30' DP Check Expected 50.0 +/-0.4 270:+/-2 50.0 +/-0.4 270 *2 50.0 +/-0.5 0.0 +/-0.18 50.0 +/-0.5 Response .As Found Response b5 .O X 0.?O.OO 27OO 2.76 -Oa bb.0o0 O.bo sa-As Left --Response I IIIII Full Scale 10m WS 10m WD 60m WS 60m WD 10m T 60m AT 10m DP Expected 100.0 +/-0.4 540 +/-2 100.0+/-0.4 540:*2 122.0 +/-0.5 10.0 +/-0.18 122.0 +/-0.5 Response As Found Response SF4on 166 0 ..O I/z2z.:0 1060 t ,,..-o As Left -.- -Response ....W Murray & Trettel, Inc. -6oo First Bank D*,'iteA .Palatine, Illinois.

60067 2 (847) 963-9ooo 0 fl.tC.LWIAA

'LAL t.6 *. nw. it .F9 R-27 7/09 Page 6 of 8 System Response Check Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003:: Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT. 30' DP 250' WD 250' WS Expected Response 0 +/-2 00-)0 0.4 ZZ.OO +/-0.5 -10.00 +/-0.18 0'Z.00 +/-0.5 O +/-2 O As Found Response _____ *0Oi Z2..Oe -.l Z.-O. O. 00 As Left Response Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected" Response ?10 +/-2 5".O +/-0.4 50.00 +/-0.5 +/-.00 +/-0.18 50,00 +/-0.5 2-10 +/-2 '0.00-0.4 As Found Response 20_._ _S4q 4_ 0. Do As Left =now Response "--__Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected SMO +/-2 I00 .-+0.4 1,.0.0o +/-0.5 10.O( +/-0.18 0+5 5 a( +/-2 /#po.O +/-0.4 Response ... ,'"O -2/P a +.As Found __58___ __.__ 10.00 ?' LP Response I_ ___ ___. _ ___oo_.,_._.

As Left 0 -. _Response I__ _ ____ -___,-_-Dateý A+/-l.j,3Jfk dldtin -wv~T otLJ Va-&A6sA~re

  • 1V) Y oq A&. ..Murray & Trettel, Inc. -600 First Bank Drive, Suite A -Palatine, Illinois.

60067 2 (847) 963-9ooo t~ay .LLJ*8 %..%J4.. A. fl~ L. *t..II*~ -FiC R-27 710S Page 7 of e System Response Check Date:' \'. Y.1 Site: Byron System: Process Computer -Y4011 -Y401 9 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30'DP Precipitation Expected O. 0 +/-0.4 t +/-2 +/-.0 +/-0.4 o 2 .2 +/-05 -.0o +/-0.18 co +/-0.5 a .co +/-0.01 Response a_____ 0_____ _____ _____As Found 0 L4 )Response O- O- 0.0 0.0 -&e w4% -Y \As Left , Response -_ _ __Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response ff00 +/-0.4 5ie , 50... ,. 2."?C +2 0.6 0. 0.00,018 '5.. +/-0.5 0.j-.)+/-O.01 As Found Response sv.o __ _ _ qe 2qc, Lqq f.7O5 As Left owl ow-Response .....Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 'Y4019 Chge 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response .i054 f O *2 0 +/-0.4 .'Ic +/-2 ?z?.=+/-0.5

/0.00+/-o.1 Io. l' +/-0.0 As Found Response IOO.10 I,, s30.I ____-- __ ____.. __ _,____As Left Response ..A0, , Murray & Trettel, Inc. -6oo First Bank DrteA -Palatine, Illinois -60067 9 (847)6-9000 System Response Check 0 Fl I R-21 NOE~Pagel 8 of (Date: 1-1f2-1"I)

Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30' WD 250' WD ,30' T 250' AT 30' DP Check Expected +/-1.2 0 +/-5 0 t5 Response 0.0 +/-1.00.5-00

+/-0,18 z.vo +/-0.5 As Found Response -0. 0.0 o. -22A< I -9.9?"__-__

As Left Response ---' --Mid Scale Check 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Expected Response IfOr. +/-1.0 +/-V. 4 1.2 .10 +/-5 27jO +5 O -+/-0.5 0. 0O +/-0.18 S0.0 +/-0.5 As Found Response 4. 8 qt.I A71-t 0 1~.0 qjq.-a0)1-As Left Response Full Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected Response 000- +/-1.0 +/-t1.2 5L) +5 5'(0 +5 122-04 +/-0.5 0. O.o.i1 112. o +/-+0.5 As Found Z. 2..Response 57L4 ?.97_________

As Left " It.L..Response Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, Illinois .6oo67 2 (847) 963-9000 Exelon Contract Number 80633 F4 R-27 7/09 Byron Meteorological Calibration Page 1 of 8 Date: ..POWER SUPPLIES+12.OOOV +/- 2.OOOV+ 13,i2(O v Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Loaoer 0.N) mph a1, L3 mph k7___ph o-( .43 mph 11 l 6f mph Q.ZW mph It.", mph,ýIe mph J!-%G mph Specifications

+/- 0.4 mph+1- 0.4 mph+/- 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph Expected 30'WD 00 900 1801, 270" 360*250' WD 0°90°1800 2700 3600 Data Logaer 00 0 .o9 .9b.-9 0 3itc .-n7 0 Specifications

+1- 20+/-20+1- 2*+/-20+/- 2" 250' WS 0.3 mph 11,71 mph 23.12 mph 45.93 mph 91.57 mph+/-20+/-20+/-29+/-20+/- 2 T Lo 30' TEMP 250' TEMP ATMId 250'-30'T Hi 30' TEMP 250' TEMP ATMId 250'30'30' TEMP 250' TEMP ATLo 250"-30'30' TEMP 250' TEMP ATHi 250'-30'Ohms 40.670 40.670 12.174 12.174 34.890 40.670 40.670 34.890 Exoected 23.00 F 23.0 0 F 0.0'F 1 00.0*F 1 00.OOF 0.OOF 32.0'F 23-OOF-9.0'F 23.0*F 32.O 0 F 9-04F Data Loaner*7.7"42- 0-0.0"1 0-0-*. (>L-\ 0 00+/-0.50+/ 0.50+/- 0.18°+/-0.180+/-0.50+/- 0.5'+1- 0.18'Specifications

+1- 0.50+1- 0.5"+1- 0.180 0 AA L.ai-io Murray & Trettel, Inc.

  • 6oo FYrst Bank Drive, Suite A .Palatine, Illinois.

60o6731 (847) 963-9000 Exelon Contract Number 80633 F5 R-27 7109 Byron Meteorological Calibration Page 2 of 8 Date: It" O Date: 6' A-10 30' Ambient.AF AL Measured .17 .°F "_--__F Recorded -F Difference

.01 5--F O-__=F Specification

  • O.5 0 F 30'AF AL-WSstall Q rmph 3 mpI Forw. WD Iq ° __' I Revr. WD "J. °-Tracking/wear TOWER MEASUREMENTS Ambient [ Ice Bath Temperatures 250' A T AF AL-1.. _°F -F+0.18.F Winds 250'AF AL:?> mph 0 a~mph all-7, () K 30' Dew Point AF AL 34, °F "-F °F 0Q F ---- OF:t2.7°F Specification 0.3mph t 0.45mph 300/3900 t 5*2100 t 50 M3 Murray & Trettel, Inc.
  • 6o0 First Bandk Drive, Suite A .Palatine, Illinois.

600673g(847) 963-9o00 F6 R-27 7/09 Byron Meteorological Calibration Page 3 of 8 Date: 5-'4. 1O Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 mos.) Wind Speed: '"- tO -VV (0 (12 mos.) Wind Direction:

-tl- -*30' 250'Aspirators:

-, Operation of Rain Gauge: Debris screen: Out Installed Removed Tower Lighting Good Fair Poor Tower Condition Good Fair Poor Beacon Side lights Wiring Flasher El 0 0: 0 0 El1 0 0 0I 11 1 Paint Guy wire tension Shelter condition 0 0 Note: AF = As Found AL = As Left-= no change (AF=AL)Calibration Instruments:

Psychrometer-S/N-J ( ".: P10 Digital multimeter

-S/N -V ,*-fl toe.-oee.Digital multimeter

-SIN -Aco I Q FS = Full Scale rechnicians:

kLE tLMA,( A. 1.l 4T Comments: Signature:

ki b-al-bo Murray & Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, llinois. 60067 i (847) 963-9ooo 0 F7 R-27 7/OS System Response Check Page 4 of E Date: l1-(o Site: Byron System: Digital Recorder Low Scale CH 1-0.4 CH2 1 CH3*0.4 CH4 41 CHS -0.5 CH6 +/-0.18 +/-CH',0,5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 0.00 MPH 0.00 DEG 0.00 MPH 0.00 DEG -22.00 DEG -10.00 DEG -22.00 DEG 0.00 IN Response ...As Found Response 0Z2 0 0. -2 .0- , -10.00 22.03 0, C)D As Left ....Response MidScale CH C02+/-1 CH3 ,0.4 CH144+/-1 CH5 ,0.5 CH6 t0.18 s CH7+/-10.5 -CH8* +/-0.01_Check. 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.00 MPH 270.00 DEG 50.00 MPH 270.00 DEG 50.00 DEG 0.00 DEG 50.00 DEG 0.50 IN Response As Found Response ,.0 '-7.00 0.(50 As Left -- ----Response I Full Scale CH 1+/-0.4 CH2 +/-1 CH3 +/-0.4 CH4+/-1 CH5 +/-0.5 CH6 +/-0.18 CH7 *0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 100.00 MPH 540.00 DEG 100.00 MPH 540.00 DEG 122.00 DEG 10.00 DEG 122.00 DEG 1.00 IN Response As Found Response 53- 06.'9 5 7___. A ),oo As Left ---Response Murray & Trettel, Inc.. 60o First Bank Drive, Suite A .Palatine, Iffinois .60o67 W(847)963-9000 FE R-27 710S Page 5 of f System Response Check Date: 5- Iq-1 , Site: Byron System: Data Logger Murray & nc,.- 600 First Bank Dr* iteA .Palatine, Illinois.

60067 2 (847) 963-9000 F9 R-27 7/0S Page 6 of E System Response Check Date: -ý,," (U Site: Byron System: Process Computer -Y4000 -Y4006 Murray & Trettel, Inc. .6oo First Bank Dribe, SuiteA -Palatine, Illinois .6oo67 2(847) 963-9oo0 Fl C R-27 7l0E Page 7 of System Response Check Date: ';- ( q-' O Site: Byron System: Process Computer-Y4011 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response 00 *0.4 (. .2 , 0.4 , *2 -22.& +0.5 .+/-0.18 .c *0.5 CC +0.01 As Found Response O.-Z VbC) .O OO2, -- = .'- -/>.0 -- ., OO0 As Left ..- _..1 ---Response _-_-d 'Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WDi 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected t2 C0.4 Response , ,. " 2 5L_ .0 +/-0.5 .0.18 _--',_ 0 "5 ,8-o +0.01 As Found Response qq.'z 21D7.L, * .O, -O As Left -Response __ __,__,__ _ .."Fullp cle Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response fob, t +/-0.4 5-h) +/-2 l~b 0 +/-0.4 2I.. o +/-0.5 /0.0 *0.18 )Z .*0.5 /. oo +/-0.01 As Found Response J'0-0 5 "tC. .'$9e, s--v.. /2.(. / , As Left .0 "--Response 10 _ _ _lpMurray & Trettel, Inc. -6oo First Bank DrWuiteA -Palatine, Illnois.-

60067 3(47 96000 Fl1 R-27 7109 Page 8 of E System Response Check Date: 5-4 /6 Site: Byron System: Control Room Indicators Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250'/AT 30' DP Check ............

...Expected Response 527>0 +/-1.0 1.C +/-1.2 , , +/-5 .) +/-0.5 j. ,0.18 -,0.5 As Found ,O.7 .50_o. 0_____ ____.Response ..._As Left .._Response Full 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP ,Check Expected Response 0..>. +1.0 ( .. +/-1.2 " 5 "5 .0.5 I, v +/-0.18 /ZZ.. , As Found Response __,"_. .I I "3 ,. _______ I 2. .3 ,0.. __ ,__As Left -Response Murray& Trettel, Inc.

  • 6oo First Bank Drive, Suite A .Palatine, fllinois .60067 9(847) 963-9000 Exelon Contract Number 455465 F4 R-28 7110 Byron Meteorological Calibration Page 1 of 8 Date: 'l-i-ic POWER SUPPLIES+12.000V +/- 2.OOOV+ v Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Logger 0 ,10 mph iILe mph 1-t mph A.' mph Specifications

+1- 0.4 mph+/- 0.4 mph+/- 0.4 mph+1- 0.4 mph+1-0.4 mph 250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Ohms T Lo 30' TEMP 40.670 250' TEMP 40.670 A TMId 250'-30'o mph +/- 0.4 mph II.Ia(e mph +/-0.4mph' mph +/-0.4 mph______' mph +1-0.4 mph.JL mph +l-0.4mph Expected 23.0'F 23.0°F 0.0'F Expected 30'WD 00 90'180'2700 360" 250'WD 00 900 1800 270" 360'Data Logger z. 0q xi 9. *'jo -08 a 11o *o6 .Specifications

+1- 0.5"+/- 0.50+1- 0.186 Data Logaer q0. 4 *1)4 .q *20,, .'11*Specifications

+/-2*+/- 2'+1- 2'+1-20+/-20+/- 2"+1-20+/-20+1- 20+/-20 T Hi 30' TEMP 250' TEMP A TMid 250'-30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP ATHi 250'-30'12.174 12.174 34.890 40.670 1 00.0"F I 00.OOF 0.0'F 32.0"F 23.0'F-9.0"F 23.0*F 32.0'F 9.0*F q4AM 0 0,100 0 S. q!0 v -1q0+1- 0.50+/- 0.5'+/-0.180+1-0.50+/- 0.50+/- 0.180+1- 0.5'+/- 0.50+1- 0.180 40.670 34.890 A3YL t& Tiett, Inc.

  • 600 Frrst Bank Driv, Suit A .Illinois .60067 I (847) 963.9000 Exelon Contract Number 455465 F5 R-28 7/10 Byron Meteorological Calibration Page 2 of 8 Date: q." -to Measured Recorded Difference Specification 30' Ambient.AF AL 71.-8 OF OF 17- T OF:0.50F TOWER MEASUREMENTS M Ambient 0 Ice Bath Temperatures 250' A T AF AL I.--etO °F " F-l.89 F .. _F , 0 .°F "FF t0.18°F 30' Dew Point AF AL 166.0 0°F OF°F ___°F S OF O°F+/-.2.7°F 30'AF AL WSstall O6,' mph 0-3 mph Forw. WO 19l -°Rew. WD 213 .-Tracking/wear 0 K Winds 250'AF AL 0.__ mph 0_ '_mph I-L oil Specification 0.3mph +/- 0.45mph 300/390° 150 2100 +/- So Comments: WAS MT or ws PMT af~la pjsahieI)I .A-SL 1o-19-/o Muray & Trett*, Inc.
  • 600 FRit Bank Diftoe. Suite A. Palatine, Ifinofs
  • 60067 9 (847) 963.9000 tzxeiOn concracc vumner ,bzqoD F6 R-28 7110 Byron Meteorological Calibration Page 3of 8 Date:/Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 mos.) Wind Speed: 9 1 10 q i, 1)(12 mos.) Wind Direction:

/11-0 1-11-10 30' 20 Aspirators:

jK DYL Operation of Heat Lamps: 0 Operation of Rain Gauge: 6A Tips Poured 05 Tips Recorded_______

Debris screen: (e Out Installed Removed UPS Check: OK Tower Liahtina Good Fair Poor Tower Condition Good Fair Poor Beacon Side lights Wiring Flasher z 1 1: Paint z 11 1 Shelter condition of 1 C Note: Calibration Instruments:

Next Cal Due AF = As Found Psychrometer-S/NN- -11 2- .o0 o AL = As Left Digital multimeter-SIN -9J4%$b1(A t'Uo-= no change (AF=AL) Digital multimeter

-SIN -FS = Full Scale Technicians:

PAOY- , M r4_0,0. M (O__Comments: MraL 0t -S P-i o, Mwuray & Trenel, Inc. *600 Fiat Bntk Dwlta., S,,ite A .Palain,,, Illinolz*

60067 11 (847) 963.9000 Exelon Contract Number 455465 7)System Response Check Page 4 a Date: ________Site: Byron System: Digital Recorder Mid Scale CH 1*0.4 CH2 *1 CH3 *0.4 CH4 *1 CH5 *0.5 CH6 *0.18 CH7 *0.5 CH8 *0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.0 MPH 270 DEG 50.0 MPH 270 DEG 50.0 DEG 0.00 DEG 50.0 DEG 0.50 IN Response As Found As Left Response Mm'rray & TretcL, Inc-. 600 Fimt Bank SitareA. Palatine, Illinois .60067 2 (847) 963.9000 Exelon Contract Number 455465 7, System Response Check Page 5 c Date: Site: Byron System: Data Logger Low Scale Cek 30' WS 30' WD 250' WS 250' WD 30' T 250' 30' DP Precip Check Expected Response 0.0,0.4 0*2 0.0+/-0.4 012 -22.00+/-0.5

-10.00+0.18

-22.00 +/-0.5 0O.01 As Found Response 0.& 0.00 0 -DZ6Z, -} O, -÷ zO .0As Left Response ........Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250' AT 30' DP Check ._____ ______._____

Expected 50.0 *0.4 270 +/-2 50.0 +/-0.4 270 +/-2 50.00 +/-0.5 0.00 +/-0.18 50.00 +/-0.5 Response .....AsFound 0.bo 70 _S -.c0O .27() 56 D OC 5O ,6.2)o Response As Left Response -Full Scale llca 10m WS 10m WO 60m WS 60m WD 10m T 60m AT 10m DP..ChCeck _____Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540,2 122.00 +/-0.5 10.00 *0.18 122.00 +/-0.5 Response As Found Response -t o .Sc) ..'. JOC> Iv.,b/-As Left ...Response .Murray & Treack Inc. -600 fint Ban1j StuittA.Pal unft, lilinois -60067 ('8471 963.9000 w Exelon Contract Number 455465 7j Page 6 c System Response Check Date: q-111-, Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 0+/-2 0.0 +/-0.4 -22.0 +/-0.5 -10.00+/-0.18

-22.0 +/-0.5 0 +/-2 0.0 +/-0.4 Response ... ..As Found Response ".q q -o As Left ---- -Response __, Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 270+/-2 50.0 +/-0.4 50.0 +/-0.5 0.00+/-0.18 50.0 +/-0.5 270 +/-2 50.0 +/-0.4 Response ._As Found 9 Response Z9&q.~' _ _ _ _ q. 7. j,-As Left Respnse ....Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Chk 30' WD 30' WS ..30' T 250' AT 30' DP 250' WD 250' WS Expected 540 +/-2 100.0 +/-0.4 122.0 +/-0.5 10.00+/-0.18 122.0 +/-0.5 540 +/-2 100.0 +/-0.4 Response I As Found 539 I/O. I ZZ, 0 /a.,5" 1 -11 ?9,9 Response As Left --Response Mtuway & Tiecr&I Inc. -600 Finst Bank Dt,M SuiteA -Palacinw, Minois -6006 7 W2(847) 963-9000 Exelon Contract Number 455465 F R-7, Page 7 c System Response Check Date: R -I 1 to Site: Byron System: Process Computer -Y4011 -Y4019 Mid Scale Y4011 Y4012 Y4013 " Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270:+/-2 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 0.50 +/-0.01 Response ........As Found j Response q2- .4,9,3 q, 0 q9,.9 _6__1 _99.7 _,_As Left--. -Response _ _7 1_0_____1________

WhB A"O Mury& Tirettek Inc. -600 Fmc Bank Star* A. PaladeinoI~is

.60067 W(847)963-9000 Exelon Contract Number 455465 F R 7 Page 8 c System Response Check Date: q 10 Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' 30' OP Check ... .......Expected 0.0 +1.0 0.0*11.2 0+5 0 *5 -22.0 +/-0.5 -10.00+/-0.18

-22.0 10.5 Response .....As Found Response -0.1 0.'3508_ _ _ _ _ _ _ _ _ _As Left -.-._Response ._Mid Sca 30' WS 250' WS 30' WD 250' WD 30' T 250' 30' DP Check _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Expected 50.0 +1.0 50.0 +/-1.2 270 +/-5 270 +/-5 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 Response As Found 5_Response 1___0___0 273_____3 As Left --Response .. .....MurM~ & Ticml, Inc. -60Pint Bw& Dwwr, Swtee A. -atan.g lILinois -6006? 7 (84?7) 963-9000

,Z, 7. 7 Annual Report on the Meteorological Monitoring Program at the Byron Nuclear Power Station 2011 prepared for Exelon Nuclear Warrenville, IL 60555 by Murray and Trettel, Incorporated 600 First Bank Drive, Suite A Palatine, IL 60067 (847) 963-9000 e-mail: mt@weathercommand.com For ExelonU Only Reviewed By:.Date:.Murray & Trettel, Inc.600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo Table of Contents Section Description Page List of Tables ......................................................................................

ii 1 Introduction

........................................................................................

1 2 Sum m ary ...........................................................................................

2 3 Data Acquisition

.................................................................................

3 4 Data Analysis ...................................................................................

5 5 Results ............................................................................................

10 Site Calibration logs ...................................................................

Appendix Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Iii I S° List of Tables i Number Description Page 1 Instrument Locations

.......................................................................

4 2 Data Loggers ...................................................................................

4 1 3 Wind Direction Classes ..................................................................

7 4 Wind Speed Classes .......................................................................

7 5 Atmospheric Stability Classes ........................................................

8 6 Data Recovery Summary ............................

11 7 Wind Rose, January-March 2011 ...............................................

14 8 Wind Rose, April-June 2011 .......................................................

16 9 Wind Rose, July-September 2011 ...............................................

18 10 Wind Rose, October-December 2011 .........................................

20 3 11 Wind Rose, January-December 2011 ..........................................

22 12 Precipitation Totals .......................................................................

24 13 Maximum Doses Resulting From Airborne Releases ..........................

25 Murray & Trettel, Inc. 600 First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9ooo Introduction The purpose of the meteorological program being conducted at the Byron Station site is to provide information sufficient to assess the local weather conditions and to determine the degree of atmospheric dispersion of airborne radioactive effluent from the station.The meteorological tower is 250 ft. high and is instrumented at two levels. Wind speed and direction are measured at 30 ft. and 250 ft. Ambient temperature is measured at 30 ft. Differential temperature, referenced to 30 ft., is measured at 250 ft. Dew point temperature is measured at 30 ft. Precipitation is measured at approximately 3 ft.Joint frequency stability wind rose tables of wind direction, wind speed, and stability are routinely tabulated from hourly measurements.

The quarterly and annual tables are included in this report.Descriptions of the instruments and digital recorder are given in Section 3 (Data Acquisition) of this report. Data reduction and processing are described in Section 4 (Data Analysis).

The results given in Section 5 of this report include modeled maximum whole body doses, skin doses, organ doses based upon airborne releases, and site meteorology.

Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 2. Summary The Byron Station meteorological monitoring program produced 52,444 hours0.00514 days <br />0.123 hours <br />7.34127e-4 weeks <br />1.68942e-4 months <br /> of valid data out of a possible 52,560 parameter hours during 2011 (365 days x 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s/day x 6 measured priority parameters), which represents an overall data recovery rate of 99.8%. Priority parameters are all parameters except dew point temperature and precipitation.

The stability wind rose tables included in this report have been generated using the 30 ft.wind data with the 250-30 ft. differential temperature data.The maximum annual calculated cumulative doses resulting from airborne releases were as follows.Unit 1: gamma air dose beta air dose whole body dose skin dose organ (child bone)Unit 2: gamma air dose beta air dose whole body dose skin dose organ (child bone)3.610 x 106 mrad 3.690 x 108 mrad 6.222 x 10-2 mrem 4.440 x 10"6 mrem 3.065 x 101 mrem 5.070 x 10-6 mrad 1.230 x 10"5 mrad 6.351 x 10-2 mrem 7.820 x 10"6 mrem 3.043 x 10-1 mrem Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo 3. Data Acquisition Wind speed and direction are measured with Climatronics F460 wind sensors. The wind speed sensors have a starting speed of 0.5 mph (0.22 mps), a range of 0 to 100 mph (0 to 44.7 mps), and a system accuracy of +/-1.0 mph at 100 mph (+/-0.45 mps at 44.7 mps). The wind direction sensors have a threshold speed of 0.5 mph (0.22 mps), a range of 0 to 5400, and a system accuracy of +/-50.Ambient and differential temperatures are measured with the Climatronics 100093 system. Ambient temperature is measured within the range of -22 to 122°F (-30.0 to 45.0°C) with an accuracy of +/-0.5°F (+0.3°C).

Differential temperature is measured within the range of -10.0 to 1 0.0°F (-5.6 to 5.6 0 C) with an accuracy of +/-0.1 8 0 F (+/-0.1 0°C). Dew point temperature is measured with the Climatronics 101197 system. Dew point temperature is measured with the range of -22 to 122°F (-30.0 to 45.0°C) with an accuracy of +/-2.7 0 F (1.5 0 C).Precipitation is measured with a Climatronics 100097-1 tipping bucket rain gauge and is measured in increments of one one-hundredth of an inch with a system accuracy of+/-0.01" (+/-0.25mm).

Instrument types and locations are summarized in Table 1.The meteorological data are collected and stored by a Campbell Scientific CR1000 Data Logger. The Campbell Scientific CR1000 measures the analog voltages of the instruments and records the digital equivalent within the range of 0 to +5 volts. Data are obtained from the Campbell Scientific CR1000 by a direct dial telephone hookup to an in-house computer system.As a backup to the CR1000, data are also recorded with a Johnson Yokogawa Corp. digital recorder (JYC DA100 data acquisition unit). Data are sampled every 10 seconds.Data loggers are summarized in Table 2.Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9000 Table I Instrument Locations Measurement Sensor Type Wind Speed Wind Direction Differential Temperature Wind Speed Wind Direction Ambient Temperature Dew Point Temperature Precipitation Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 100075 F460 Climatronics 100076 F460 Climatronics 100093 Climatronics 1001197 Climatronics 100097-1 Location Tower Tower Tower Tower Tower Tower Tower Ground Elevation 250 ft.250 ft.250 ft.30 ft.30 ft.30 ft.30 ft.3 ft.Table 2 Data Loaoes Measurement Winds, Temperatures, and Precipitation Winds, Temperatures, and Precipitation Loaaer Tyoe Campbell Scientific CR1000 Johnson Yokogawa Corp. Digital Recorder (JYC DA100 and Contec IPC-PT/M300(PC)WOU) digital recorder Sampling Frequency 1 sec.10 sec.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 4. Data Analysis The Byron data logger is routinely interrogated to obtain hourly average data. The data are then stored in the meteorological data base and listings of the data are generated.

The data listings are examined by qualified personnel and any apparent problems are brought to the attention of the Project Manager or Meteorological Technician and the Instrument Maintenance staff.Hourly values of wind speed, wind direction, ambient temperature, differential temperature, dew point temperature, and precipitation are obtained through measurements taken at the site. The standard deviation of wind direction (sigma) is derived. The wind direction variation is described in terms of the standard deviation of the direction about the mean direction.

The CR1000 computes an hourly value of wind sigma by taking the Root-Mean-Square (RMS) of the four quarter-hour wind sigma values. The quarter-hour wind sigma values are calculated directly from the one second wind direction samples during the 15 minute period.The data base files are edited approximately once a week. Missing data logger values are replaced with digital recorder values, when available.

Invalid data are deleted from the data base.When an hourly value is missing or invalid, the numeral 999 is entered into the computer data file in the appropriate location.

When the wind direction changes substantially relative to its short term fluctuations, the numeral 888 can be entered into the wind sigma location to indicate shifting winds. When the wind blows with velocities near the sensing threshold of the instrument, the numeral 777 can be entered into the wind direction, wind speed, and wind sigma locations to indicate light and variable winds.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Ilinois 60067 (847)963-9000 A professional meteorologist reviews the data, calibration findings, equipment maintenance reports, and other information and determines which data are valid. Only the valid data are retained in the data base.As a quality control measure, a monthly comparison is made of Microtel and digital recorder data. An investigation is made into the reasons for any significant differences between the sets of values.Joint frequency stability wind rose tables of hourly data measured at the site are generated.

These tables indicate the prevailing wind direction, wind speed, and stability classes measured during the period of observation as well as the joint frequencies of occurrence of the wind direction, wind speed, and stability classes. The values are also used as input to the atmospheric transport and diffusion models. Wind direction, wind speed, and stability classes are given in Tables 3, 4, and 5.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 Table 3 Wind Direction Classes IF IF IF IF IF IF IF IF IF IF IF IF IF IF IF IF 348.750 <11.250 <33.750 <56.250 <78.750 <101.250 <123.750 <146.250 <168.750 <191.250 <213.750 <236.250 <258.750 <281.250 <303.75 0 <326.250 <WD <WD <WD <WD <WD <WD <WD <WD <WD <WD <WD <WD5 WD <WD <WD <WD <11.250 THEN Class is 33.750 THEN Class is 56.250 THEN Class is 78.750 THEN Class is 101.250 THEN Class is 123.750 THEN Class is 146.250 THEN Class is 168.750 THEN Class is 191.250 THEN Class is 213.750 THEN Class is 236.250 THEN Class is 258.750 THEN Class is 281.250 THEN Class is 303.750 THEN Class is 326.250 THEN Class is 348.750 THEN Class is N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Table 4 Wind Speed Classes IF 0.0 mph < WS < 0.5 mph THEN Class is IF 0.5 mph < WS < 3.5 mph THEN Class is IF 3.5 mph < WS < 7.5 mph THEN Class is IF 7.5 mph < WS < 12.5 mph THEN Class is IF 12.5mph < WS < 18.5mph THEN Classis IF 18.5 mph < WS < 24.5 mph THEN Class is IF 24.5 mph < WS THEN Class is 1 2 3 4 5 6 7 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Table 5 Atmospheric Stability Classes Differential Temperature Interval (in °C/100m) (1)Differential Temperature Interval (in OF over the 250-30 ft. interval)

(2)Class I I I I I.I I I I I I Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable-1.9 <-1.7 <-1.5 <-0.5 <1.5 <4.0 <AT < -1.9 AT < -1.7 AT < -1.5 AT < -0.5 AT < 1.5 AT < 4.0 AT-2.3 <-2.1 <-1.9 <-0.7 <1.8 <4.8 <AT < -2.3 AT < -2.1 AT < -1.9 AT < -0.7 AT < 1.8 AT < 4.8 AT (1 from ANSIIANS 2.5 (2) ANSIIANS 2.5 intervals scaled for instrument heights on the Byron meteorological tower Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9000 The following two programs were used to calculate doses resulting from radioactive releases: 1. XOQDOQ: Computer Program for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations (NUREG/CR-2919).

The program is based on the theory that material released to the atmosphere will be normally distributed (Gaussian) about the plume centerline.

A straight-line trajectory is assumed between the point of release and all receptors.

The program implements the assumptions outlined in Section C of NRC Regulatory Guide 1.111. In evaluating routine releases from nuclear power plants, it primarily is designed to calculate annual relative effluent concentrations, X/Q values and annual average relative deposition, D/Q values.Output from the XOQDOQ program is used as input to the GASPAR program.2. GASPAR I1: A Code System for Evaluation of Radiological Impacts Due to the Release of Radioactive Material to the Atmosphere During Normal Operation of Light Water Reactors (NUREG-0597).

GASPAR is a program written for the evaluation of radiological impacts due to the release of radioactive material to the atmosphere during normal operation of reactors.

The GASPAR code implements the radiological impact models of NRC Regulatory Guide 1.109, Revision 1, for atmospheric releases.

The program is used to estimate the maximum individual doses at selected locations in the vicinity of the plant.Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 5. Results 5.1 Instrument Maintenance The maintenance program followed during 2011 was composed of routinely scheduled visits and equipment repairs. Routine site visits were made to inspect the sensing and recording systems for proper operation.

In addition, routine maintenance and calibration checks of all tower-mounted and ground level equipment were performed every four months. A description of the calibration and field procedures is found in the Murray and Trettel, Inc. "P1009 Procedures Manual" (July 2010).In February, dew point data was lost due to a faulty sensor. The sensor was replaced in March.In March, the dew point sensor was replaced.

Also in March, the annual tower inspection was performed.

On that same day, a damaged 250 ft. wind vane was replaced.

Later in the month, a bad fan inside of the digital recorder was replaced.In April, the 30 ft. wind direction sensor was replaced due to failure.In July, a noisy phone line caused communications problems with the data logger.The line was repaired by Frontier Communications in August.During the September calibration, repairs were made to the current cards for Y4005 and Y4016 No other significant problems were encountered with the equipment, and at the end of the year, no problems were evident at the site.Murray & Trettel, Inc. 600 First Bank Driue, Suite A Palatine, Illinois 60067 (847) 963-9000 5.2 Data Recovery The record of data recovery for the year is summarized in Table 6.Table 6 Byron Site Data Recovery Summary 2011 Measurement Wind Speed Wind Speed Wind Direction Wind Direction Ambient Temperature Differential Temperature Dew Point Temperature Precipitation Elevation 30 ft.250 ft.30 ft.250 ft.30 ft.250-30 ft.30 ft.3 ft.Recovered Hours 8751 8751 8745 8707 8745 8745 8435 8691 Recovered Percent 99.9 99.9 99.8 99.4 99.8 99.8 96.3 99.2 Lost Hours 9 9 15 53 15 15 325 69 Percent Changed 0.5 0.2 1.1 0.9 0.2 0.5 4.4 1.0 AVERAGE*99.8* average of priority parameters (all except dew point temperature and precipitation)

Valid Hours Lower Level Joint Frequency

% 8745 Upper Level Joint Frequency

% 8707 Recovered Percent 99.8 99.4 Lost Hours 15 53 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo 5.3 I p 5.I I I I I I I.I i I I-12-Summary of Billings for Equipment Repairs, Replacement Parts, and Other Work not Included in Fixed-Cost Maintenance Agreement

-2011 Description

-Byron January Meteorological equipment maintenance Meteorological parts, materials, and contractor services February Meteorological parts, materials, and contractor services March Meteorological parts, materials, and contractor services Special Request ADr Meteorological equipment maintenance Meteorological parts, materials, and contractor services May Meteorological equipment maintenance Meteorological parts, materials, and contractor services June Meteorological equipment maintenance Meteorological parts, materials, and contractor services Ju/V Meteorological equipment maintenance August Meteorological equipment maintenance September Meteorological equipment maintenance Meteorological parts, materials, and contractor services October Meteorological parts, materials, and contractor services November Meteorological parts, materials, and contractor services December Meteorological parts, materials, and contractor services Annual Total: Cost$ 1,424.34 0.00 146.40 1,236.96 188.89 1,156.05 614.90 240.00 34.24 150.00 639.10 384.00 368.34 240.00 196.28 491.69 848.97 0.00$ 8,360.16 Murray & Trettel, Inc. 6oo First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9000 5.4 Stability Wind Rose Data The quarterly and.annual stability wind roses are given in Tables 7 through 11. Wind speed classes have been altered to reflect the sensor threshold.

For the year, winds measured at 30 ft. most frequently came from the south (8.64%) and fell into the 3.6-7.5 mph and 7.6-12.5 mph wind speed classes (36.51% and 34.60%respectively).

Calms (wind speeds at or below the sensor threshold) were measured 0.14% of the time. Speeds greater than 24.5 mph were measured 0.06% of the time.Stability based on the 250-30 ft. differential temperature most frequently fell into the neutral classification (49.64%).Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 I .TABLE 7-14-Byron Generating Station 30 ft. Wind Speed and Direction January-March.

2011 250Ft-3OFt Delta-T (F)Number of Observations

-2163 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ..................................

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL.STABILITY CLASSES ..........

EU MU SU N SS MS ES TOTAL I EU MU C SU LNSS M MS ES EU IM I1SU N 3 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.00 0.00 00.O00 4 SU 0.00-N 0.69 7 SS 0.55 MS 0.09 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.00 0.00 0.00 0.00 0.00 0.92 0.65 0.09 0.05 0.00 0.09 0.05 1.25 0.28 0.00 0.00 0.00 0.00 0.00 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.18 0.00 0.00 0.00 0.00 0.05 0.83 0.79 0.05 0.00 0.00 0.09 0.14 1.85 0.18 0.00 0.00 0.00 0.00 0.00 0.42 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.09 0.00 0.00 0.00 0.00 0.00 1.66 1.57 0.09 0.00 0.00 0.14 0.23 2.59 0.28 0.00 0.00 0.00 0.00 0.05 0.92 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.28 0.32 0.05 0.00 0.00 0.09 2.54 1.25 0.14 0.09 0.05 0.00 0.09 2.13 0.23 0.05 0.00 0.00 0.00 0.00 0.37 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.23 0.14 0.09 0.00 0.00 0.05 0.05 0.79 0.65 0.23 0.09 0.00 0.00 0.05 0.55 0.28 0.00 0.00 0.00 0.00 0.00 0.37 0.42 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.05 0.00 0.00 0.00 0.05 0.65 0.23 0.23 0.05 0.00 0.00 0.00 1.02 0.28 0.18 0.00 0.00 0.00 0.00 0.42 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.05 0.00 0.00 0.00 0.00 0.55 0.28 0.23 0.00 0.00 0.00 0.00 1.43 0.88 0.37 0.00 0.00 0.00 0.00 0.79 0.23 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.09 0.00 0.00 0.00 0.00 0.60 0.14 0.28 0.14 0.00 0.00 0.00 1.20 1.06 0.09 0.00 0.00 0.00 0.00 0.42 0.65 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.14 0.28 0.14 0.00 0.00 0.00 0.46 0.51 0.14 0.09 0.00 0.00 0.00 1.02 0.92 0.05 0.00 0.00 0.00 0.00 0.74 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.32 0.14 0.14 0.00 0.00 0.00 1.11 0.74 0.18 0.09 0.00 0.05 0.05 1.66 0.97 0.00 0.00 0.00 0.00 0.00 0.51 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.23 0.18 0.00 0.00 0.00 0.00 0.97 0.65 0.14 0.09 0.05 0.09 0.09 1.11 0.42 0.00 0.00 0.00 0.00 0.05 0.69 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.28 0.32 0.32 0.09 0.00 0.00 0.00 1.48 0.46 0.09 0.05 0.00 0.05 0.09 1.11 1.16 0.05 0.00 0.00 0.00 0.05 1.16 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.18 0.14 0.05 0.09 0.00 0.00 0.00 1.53 1.34 0.05 0.00 0.00 0.00 0.09 2.17 0.88 0.00 0.00 0.00 0.09 0.14 0.60 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.23 0.14 0.00 0.00 0.00 0.00 2.31 1.90 0.09 0.00 0.00 0.05 0.14 4.11 0.46 0.00 0.00 0.00 0.00 0.09 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.18 0.14 0.00 0.00 0.00 0.00 1.71 0.60 0.09 0.00 0.00 0.00 0.00 2.40 0.05 0.00 0.00 0.00 0.09 0.09 0.65 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.09 0.00 0.05 0.00 0.00 0.00 0.05 2.73 2.64 1.85 0.51 0.00 0.00 0..05 0.23 18.82 12.30 2.22 0.74 0.09 0.09 0.55 1.06 28.90 8.37 0.83 0.00 0.00 0.00 0.18 0.46 10.40 3.33 0.09 0.00 0.00 0.18 0.09 0.00 0.05 0.32 0.00 0.05 2.73 2.64 1.85 0.51 7.77 0.00 0.05 0.23 18.82 12.30 2.22 0.74 34.35 EU MU SU N SS MS ES 0.00 0.00 0.05 3.28 0.05 0.05 0.00 0.00 0.00 0.00 1.39 0.00 0.00 0.00 0.55 1.06 28.90 8.37 0.83 0.00 39.81 EU IMU 3 SU 1 N MS FES 0.18 0.46 10.40 3.33 0.09 0.00 14.47 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9000 I TABLE 7 continued-15-Byron Generating Station 30 ft. Wind Speed and Direction January-March.

2011 250Ft-3OFt Delta-T (F)SPEED ----------------------------------

WIND DIRECTION CLASSES ..................................

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL---------

STABILITY CLASSES ----------

EU MU SU N SS MS ES To EU IMU 9 SU 2 SS 4MS ES EU I'G MU T SU N 2 SS 4 MS ES 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 O0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0:00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.28 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.06 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 2.36 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.05 2.36 0.51 0.00 0.00 2.91 0.00 0.00 0.05 0.00 0.00 0.00 0.05 99.68 TOT 6.61 4.35 5.18 8.18 8.00 4.07 3.61 5.04 4.90 5.04 6.24 5.73 8.37 7.67 10.17 6.24 99.68 0.09 0.79 1.85 63.43 27.23 4.99 1.29 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.00 0.05 5.73 0.69 0.14 0.00 0.00 0.09 0.05 3.05 1.02 0.09 0.05 0.00 0.09 0.18 3.51 1.34 0.05 0.00 0.00 0.14 0.28 5.50 2.17 0.09 0.00 0.05 0.00 0.18 5.27 1.85 0.51 0.14 0.00 0.05 0.14 1.99 1.48 0.32 0.09 0.00 0.00 0.05 2.22 0.83 0.46 0.05 0.00 0.00 0.00 2.91 1.43 0.69 0.00 0.00 0.00 0.00 2.31 1.94 0.51 0.14 0.00 0.00 0.00 2.36 1.99 0.46 0.23 0.00 0.05 0.05 3.42 2.17 0.32 0.23 0.05 0.09 0.18 3.28 1.71 0.32 0.09 0.00 0.05 0.14 5.09 2.45 0.46 0.18 0.00 0.09 0.23 4.53 2.64 0.09 0.09 0.00 0.05 0.23 7.07 2.59 0.23 0.00 0.00 0.09 0.09 4.99 0.83 0.23 0.00 0.09 0.79 1.85 63.43 27.23 4.99 1.29-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.23 1.34 3.42 1.39 0.23 0.00 0.00 0.23 1.71 1.66 0.51 0.23 0.00 0.00 0.28 1.71 2.27 0.60 0.28 0.05 0.00 0.42 3.33 3.24 1.20 0.00 0.00 0.00 0.88 4.11 2.54 0.46 0.00 0.00 0.00 0.51 1.85 0.88 0.79 0.05 0.00 0.00 0.23 1.20 1.48 0.69 0.00 0.00 0.00 0.18 1.06 2.68 1.06 0.05 0.00 0.00 0.28 1.16 2.36 1.11 0.00 0.00 0.00 0.65 1.20 1.99 1.11 0.09 0.00 0.00 0.74 2.13 2.73 0.60 0.05 0.00 0.00 0.65 1.85 1.76 1.02 0.46 0.00 0.00 1.02 2.08 2.45 1.53 1.25 0.00 0.00 0.46 2.91 3.14 1.02 0.14 0.00 0.00 0.55 4.30 4.76 0.55 0.00 0.00 0.00 0.46 2.40 2.45 0.83 0.09 0.00 0.32 7.77 34.35 39.81 14.47 2.91 0.05-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph 0 Murray & Trettel, Inc. 600 FYrst Bank Drive, Suite A Palatine, Illinois "'6oo67 (847) 963-9ooo I .TABLE 8-16-Byron Generating Station 30 ft. Wind Speed and Direction April-June.

2011 250Ft-30Ft Oelta-T (F)Number of Observations

-2174 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL---------

STABILITY CLASSES ----------

EU MJ SU N SS MS ES TOTAL C A EU MU SU N SS MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.14 0.18 EU I1 SU-N 3 SS ES I 00.09 3 N 1.10 7SS 0.74 MS 0.37 ES 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.05 0.05 0.00 0.00 0.00 1.01 0.69 0.09 0.00 0.00 0.05 0.05 1.33 0.51 0.00 0.00 0.09 0.09 0.23 1.66 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.28 0.09 0.05 0.00 0.00 0.00 0.51 0.60 0.00 0.00 0.00 0.05 0.05 1.10 0.41 0.00 0.00 0.00 0.09 0.05 0.83 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.05 0.69 0.79 0.23 0.00 0.00 0.05 0.05 2.67 0.87 0.00 0.00 0.00 0.18 0.09 1.43 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.28 0.09 0.05 0.00 0.00 0.00 1.75 1.98 0.78 0.05 0.00 0.09 0.23 2.58 0.37 0.09 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.05 0.00 0.14 0.00 0.00 0.00 0.78 0.83 0.41 0.18 0.14 0.18 0.05 1.56 1.24 0.14 0.09 0.00 0.00 0.00 0.55 0.69 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.05 0.09 0.00 0.00 0.00 0.37 0.83 0.74 0.18 0.00 0.00 0.14 1.06 0.83 0.18 0.00 0.00 0.00 0.00 0.51 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.18 0.00 0.00 0.00 0.05 0.46 0.97 0.64 0.09 0.00 0.00 0.05 1.38 1.47 0.74 0.00 0.00 0.00 0.00 0.28 0.28 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.09 0.05 0.09 0.00 0.00 0.00 0.78 0.60 0.18 0.09 0.00 0.09 0.28 1.98 1.15 0.18 0.05 0.00 0.09 0.28 1.15 0.46 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.32 0.14 0.00 0.05 0.09 0.60 0.87 0.18 0.00 0.00 0.14 0.09 0.87 1.52 0.00 0.00 0.00 0.05 0.18 0.92 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.14 0.05 0.00 0.00 0.00 0.69 0.55 0.00 0.00 0.00 0.00 0.09 1.66 0.69 0.00 0.00 0.00 0.00 0.00 0.55 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.14 0.00 0.00 0.00 0.28 0.78 0.00 0.00 0.00 0.00 0.14 1.33 0.74 0.00 0.00 0.00 0.00 0.00 0.60 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.32 0.41 0.09 0.00 0.00 0.00 0.14 1.10 0.00 0.00 0.00 0.00 0.00 1.29 0.64 0.00 0.00 0.09 0.41 0.14 1.20 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.23 0.23 0.05 0.00 0.00 0.05 0.46 1.10 0.18 0.00 0.05 0.00 0.00 1.89 0.69 0.00 0.00 0.23 0.46 0.23 1.61 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.32 0.18 0.00 0.00 0.00 0.74 0.46 0.05 0.05 0.00 0.00 0.37 1.70 0.28 0.00 0.00 0.00 0.09 0.14 0.46 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.09 0.14 0.00 0.00 0.05 0.74 0.41 0.05 0.05 0.00 0.00 0.00 0.87 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.64 3.08 2.30 1.43 0.00 0.05 0.00 0.00 0.05 0.00 0.00 0.00 0.64 3.08 2.30 1.43 7.45 0.00 0.09 0.09 0.05 0.05 0.28 11.09 13.29 3.91 0.74 0.28 11.09 13.29 3.91 0.74 29.44 I EU K)8 SU N MS ES EU SU-N 1 SS 0.05 0.00 0.09 1.24 0.32 0.05 0.00 0.00 0.05 0.00 0.46 0.00 0.00 0.00 0.23 0.23 0.64 1.66 24.52 11.78 1.38 0.14 0.41 0.41 1.52 1.33 12.24 2.99 0.14 0.00 0.64 1.66 24.52 11.78 1.38 0.14 40.34 1.52 1.33 12.24 2.99 0.14 0.00 18.63 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, fllinois 60067 (847)963-9ooo I TABLE 8 continued-17-Byron Generating Station 30 ft. Wind Speed and Direction April-June.

2011 250Ft-3OFt Delta-T (F)E SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL I EU 1MU 9 SU-N 2 SS 4MS I ES EU EG N T SU N 2 SS 4 MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0-.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.83 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.37 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.14 0.18 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.23 0.51 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0 0 0 0 0 0.00 0.00 0.09 0..00 0.00 0.05.00 0.00 0.51.00 0.00 2.90.00 0.00 0.37.00 0.00 0.00.00 0.00 0.00.........

STABILITY CLASSES ------- ---EU MU SU N SS MS ES.09 0.05 0.51 2.90 0.37 0.00 0.00 3.91 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.00 0.00 0.00 0.00 0.09 0.05 0.00 0.00 0.14 99.95 TOT 5.24 6.26 4.55 8.23 8.42 7.31 5.98 7.04 8.10 7.18 4.74 4.37 6.95 7.77 5.11 2.67 99.95 0.83 2.25 3.77 51.47 31.60 7.73 2.30 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.14 0.05 0.09 2.81 1.38 0.55 0.23 0.09 0.14 0.28 4.00 1.56 0.14 0.05 0.00 0.14 0.09 2.90 1.29 0.09 0.05 0.00 0.23 0.18 5.66 1.93 0.23 0.00 0.00 0.09 0:23 4.42 2.62 0.97 0.09 0.14 0.18 0.05 2.99 2.94 0.60 0.41 0.00 0.00 0.14 2.30 2.30 0.97 0.28 0.00 0.00 0.23 2.25 2.85 1.61 0.09 0.00 0.18 0.55 4.37 2.30 0.46 0.23 0.00 0.23 0.51 2.62 3.17 0.51 0.14 0.00 0.00 0.09 2.94 1.52 0.14 0.05 0.00 0.00 0.14 2.25 1.70 0.14 0.14 0.18 0.46 0.37 3.17 2.25 0.41 0.09 0.28 0.46 0.28 4.19 2.12 0.41 0.05 0.00 0.09 0.51 2.90 1.01 0.37 0.23 0.00 0.00 0.05 1.70 0.60 0.14 0.18 0.83 2.25 3.77 51.47 31.60 7.73 2.30-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable I Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.64 2.35 1.75 0.51 0.00 0.00 0.00 0.28 1.79 1.93 2.25 0.00 0.00 0.00 0.51 1.10 1.61 0.97 0.37 0.00 0.00 0.18 1.75 3.63 1.79 0.83 0.05 0.00 0.46 4.55 3.36 0.05 0.00 0.00 0.00 0.23 2.21 3.40 1.29 0.14 0.05 0.00 0.32 2.12 2.21 0.87 0.46 0.00 0.00 0.32 2.21 3.63 0.60 0.28 0.00 0.00 0.37 1.66 3.73 2.02 0.28 0.05 0.00 0.69 1.79 2.62 1.61 0.46 0.00 0.00 0.41 1.24 2.44 0.64 0.00 0.00 0.00 0.41 1.06 2.21 0.64 0.05 0.00 0.00 0.87 1.24 1.93 1.98 0.92 0.00 0.00 0.60 1.79 2.62 2.62 0.14 0.00 0.00 0.74 1.29 2.35 0.74 0.00 0.00 0.00 0.41 1.29 0.92 0.05 0.00 0.00 0.05 7.45 29.44 40.34 18.63 3.91 0.14-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo I *TABLE 9-18-Byron Generating Station 30 ft. Wind Speed and Direction July-September.

2011 250Ft-3OFt Oelta-T (F)Number of Observations

-2186 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ..................................

CLASS N NNE NE ENE E ESE SE SSE I SSW SW WSW W WNW NW NNW TOTAL---------

STABILITY CLASSES ----------

EU MU SU N IS MS ES TOTAL I EU MU C SU ANSS L I E S ES EU IK I1SU.N 3 IS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.32 0.37 0.09 0.00 0.05 I4 SU 0.00.N 2.33 7S5 2.42 MS 1.01 ES 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.69 0.14 0.00 0.00 0.05 0.05 1.05 1.19 0.41 0.00 0.05 0.05 0.14 1.05 0.14 0.00 0.00 0.00 0.05 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.27 0.23 0.05 0.00 0.00 0.00 0.37 0.69 0.00 0.00 0.00 0.00 0.00 0.46 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.18 0.18 0.32 0.05 0.00 0.00 0.00 0.27 1.28 0.32 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.64 0.32 0.00 0.00 0.00 0.00 0.82 1.10 0.59 0.27 0.00 0.00 0.00 0.18 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.41 0.41 0.27 0.00 0.05 0.00 0.78 0.91 1.28 0.37 0.09 0.00 0.05 0.23 0.69 0.14 0.00 0.00 0,00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.32 0.18 0.23 0.00 0.00 0.00 0.78 0.55 0.78 0.41 0.05 0.05 0.09 1.01 0.50 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.18 0.23 0.46 0.00 0.00 0.00 0.69 0.91 1.46 0.59 0.00 0.00 0.00 0.55 0.37 0.05 0.09 0.00 0.00 0.00 0.23 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.32 0.41 0.23 0.00 0.00 0.00 0.96 1.14 1.37 0.59 0.00 0.09 0.05 1.42 0.69 0.09 0.05 0.00 0.00 0.09 0.64 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.41 0.82 0.41 0.00 0.00 0.00 1.10 0.91 0.59 0.32 0.00 0.09 0.00 1.01 0.59 0.09 0.00 0.00 0.05 0.05 0.23 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.27 0.82 0.32 0.00 0.00 0.05 1.10 1.28 0.18 0.00 0.00 0.05 0.18 0.64 0.87 0.00 0.00 0.00 0.05 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.64 0.64 0.18 0.00 0.00 0.09 1.69 1.10 0.09 0.00 0.09 0.09 0.32 0.50 0.50 0.00 0.00 0.05 0.00 0.00 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.69 0.23 0.59 0.41 0.00 0.00 0.05 1.60 0.69 0.14 0.00 0.00 0.05 0.09 1.10 0.23 0.05 0.00 0.09 0.05 0.18 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.73 0.82 0.87 0.00 0.05 0.05 0.78 0.78 0.14 0.00 0.00 0.05 0.14 0.46 0.37 0.00 0.00 0.00 0.00 0.00 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 1.01 0.73 0.82 0.00 0.05 0.00 1.65 1.33 0.23 0.09 0.05 0.05 0.05 0.69 0.18 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.64 1.10 0.37 0.00 0.00 0.05 2.15 2.38 0.91 0.23 0.09 0.18 0.18 0.82 0.27 0.00 0.00 0.00 0.00 0.18 0.23 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.00 0.05 0.00 0.00 0.00 0.05 3.93 7.27 8.14 4.76 0.00 0.09 0.05 0.00 0.05 0.00 0.05 3.93 7.27 8.14 4.76 24.15 0.00 0.00 0.23 0.32 18.12 18.66 9.52 2.93 0.41 0.73 1.46 12.35 5.95 0.50 0.14 0.00 0.23 0.32 18.12 18.66 9.52 2.93 49.77 EU MU SU N SS MS ES 0.00 0.00 0.18 2.10 0.23 0.09 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.41 0.73 1.46 12.35 5.95 0.50 0.14 21.55 EU 1IMU 3SU-N 1 SS ES 0.14 0.14 0.18 0.59 2.33 0.41 0.05 0.00 0.18 0.59 2.33 0.41 0.05 0.00 3.71 Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo I TABLE 9 continued-19-Byron Generating Station 30 ft. Wind Speed and Direction July-September.

2011 250Ft-3OFt Delta-T (F)SPEED ----------------------------------

WIND DIRECTION CLASSES ................

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W----------------..........

STABILI WNW NW NNW TOTAL EU MU SU T Y C L A S S E S ----------N SS MS ES I EU 1 MU 9 SU-N 2 SS 4MS IES EU IGMU TSU N 2 SS 4 MS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00" 0.00 0.00 0.o0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.46 0.00 0.00 0.00 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 99.82 TOT 9.56 5.40 2.38 2.84 4.48 5.81 5.31 6.13 6.51 6.91 6.22 6.31 6.27 6.04 7.32 10.16 99.82 0.55 1.14 2.42 37.28 32.34 18.21 7.87 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.05 0.18 4.76 2.97 1.46 0.14 0.05 0.14 0.27 2.38 2.01 0.55 0.00 0.00 0.00 0.00 0.96 1.14 0.23 0.05 0.00 0.00 0.05 0.59 1.51 0.64 0.05 0.00 0.00 0.00 1.46 1.83 0.91 0.27 0.09 0.05 0.05 1.14 2.01 1.83 0.64 0.05 0.05 0.09 2.15 1.37 0.96 0.64 0.00 0.00 0.00 1.74 1.46 1.78 1.14 0.00 0.09 0.14 3.25 2.29 1.88 0.87 0.00 0.14 0.05 2.52 1.97 1.51 0.73 0.00 0.09 0.23 2.15 2.42 1.01 0.32 0.14 0.09 0.41 2.47 2.29 0.73 0.18 0.09 0.09 0.32 3.43 1.14 0.78 0.41 0.00 0.09 0.18 2.06 1.88 0.96 0.87 0.05 0.09 0.05 2.70 2.56 0.96 0.91 0.09 0.18 0.41 3.43 3.43 2.01 0.59 0.55 1.14 2.42 37.28 32.34 18.21 7.87-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable W wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 1.05 5.86 2.61 0.05 0.00 0.00 0.00 1.01 2.74 1.42 0.23 0.00 0.00 0.00 0.69 1.05 0.64 0.00 0.00 0.00 0.00 0.78 1.88 0.18 0.00 0.00 0.00 0.00 1.42 2.79 0.27 0.00 0.00 0.00 0.00 1.24 3.39 1.19 0.00 0.00 0.00 0.00 1.01 2.52 1.69 0.09 0.00 0.00 0.00 1.14 3.66 1.05 0.27 0.00 0.00 0.00 1.10 4.07 2.38 0.87 0.09 0.00 0.00 1.74 2.93 1.78 0.37 0.09 0.00 0.00 1.60 2.61 1.74 0.27 0.00 0.00 0.00 1.69 2.97 1.51 0.14 0.00 0.00 0.00 1.92 2.47 1.51 0.37 0.00 0.00 0.00 2.70 1.78 1.01 0.32 0.23 0.00 0.00 2.74 3.34 1.01 0.18 0.05 0.00 0.00 2.33 5.72 1.56 0.55 0.00 0.00 0.18 24.15 49.77 21.55 3.71 0.46 0.00-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo i TABLE 10-20-Byron Generating Station 30 ft. Wind Speed and Direction October-December.

2011 250Ft-30Ft Delta-T (F)Number of Observations

-2205 Values are Percent Occurrence SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

I CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL.........

STABILITY CLASSES ----------

EU MU SU N SS MS ES TOTAL E EU MU C SU AN LS ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 EU 0 00 E MU 0.00 I SU 0.00-N 0.05 3 SS 0.09 MS 0.14 ES 0.00 4 SU 0.05 7SS 0.63 MS 0.09 I ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.45 0.32 0.00 0.00 0.00 0.00 0.05 1.32 0.36 0.00 0.00 0.00 0.00 0.00 0.95 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.05 0.05 0.00 0.00 0.00 0.50 0.18 0.05 0.00 0.00 0.00 0.00 0.54 0.36 0.00 0.00 0.00 0.00 0.00 0.36 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.09 0.09 0.00 0.00 0.00 0.00 0.32 0.27 0.09 0.00 0.00 0.00 0.00 0.50 0.41 0.00 0.00 0.00 0.00 0.00 0.14 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.18 0.05 0.18 0.00 0. 00.0.-00 0.54 0.23 0.27 0.32 0.00 0.00 0.00 0.32 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0.14 0.00 0.00 0.00 0.23 0.36 0.54 0.36 0.00 0.00 0.00 0.09 0.09 0.18 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.14 0.14 0.00 0.00 0.00 0.18 0.50 0.59 0.82 0.00 0.00 0.05 0.23 0.41 0.05 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.14 0.05 0.36 0.00 0.00 0.05 0.59 0.77 0.91 0.73 0.00 0.09 0.05 1.00 2.13 1.68 0.41 0.00 0.00 0.00 0.77 0.63 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.32 0.14 0.36 0.00 0.05 0.05 0.73 1.32 0.68 0.41 0.00 0.09 0.09 1.77 2.13 0.50 0.05 0.00 0.00 0.09 1.95 1.90 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.32 0.23 0.05 0.14 0.00 0.00 0.23 0.68 1.09 0.36 0.36 0.00 0.09 0.05 1.72 1.32 0.00 0.00 0.00 0.00 0.14 1.50 0.95 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.32 0.14 0.05 0.00 0.05 0.09 1.13 1.04 0.14 0.00 0.00 0.00 0.23 1.36 0.82 0.00 0.00 0.00 0.00 0.00 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.09 0.23 0.00 0.00 0.00 0.00 0.59 0.54 0.09 0.00 0.00 0.00 0.09 1.13 1.00 0.00 0.00 0.00 0.00 0.00 0.36 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.54 0.36 0.14 0.00 0.00 0.09 1.54 1.63 0.68 0.00 0.00 0.09 0.09 0.86 2.31 0.05 0.00 0.00 0.14 0.09 1.36 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.59 0.50 0.45 0.00 0.00 0.18 1.32 1.04 0.18 0.00 0.00 0.05 0.00 1.50 0.50 0.00 0.00 0.00 0.09 0.09 1.36 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.41 0.32 0.63 0.00 0.05 0.14 1.13 0.95 0.14 0.05 0.00 0.00 0.05 1.22 0.36 0.00 0.00 0.00 0.00 0.00 0.59 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.27 0.14 0.50 0.00 0.00 0.00 1.22 1.04 0.05 0.00 0.00 0.00 0.00 1.72 0.41 0.00 0.00 0.00 0.00 0.00 1.22 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.86 3.58 2.40 3.13 0.00 0.00 0.14 0.86 11.66 11.93 4.85 3.04 0.00 0.00 0.54 0.91 18.87 13.42 2.45 0.59 0.00 0.00 0.23 0.41 12.20 4.35 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.86 3.58 2.40 3.13 10.98 0.14 0.86 11.66 11.93 4.85 3.04 32.47 I EU MU 8 SU-N 12MS ES EU SU-N 1 SS ES 0.00 0.14 0.18 3.58 0.63 0.00 0.00 0.00 0.00 0.00 1.32 0.05 0.00 0.00 0.54 0.91 18.87 13.42 2.45 0.59 36.78 0.23 0.41 12.20 4.35 0.00 0.00 17.19 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo ITABLE 10 continued-21-Byron Generating Station 30 ft. Wind Speed and Direction October-December.

2011 250Ft-3OFt Delta-T (F)SPEED--------------------------WIND DIRECTION CLASSES .............................

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL.........

STABILITY CLASSES ----------

EU MU SU N SS MS ES TIO I EU IMU 9 SU 2 SS 4MS ES EU TSU N ES 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.41 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.18 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 1.95 0.54 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.05 0.00 1.95 0.54 0.00 0.00 2.54 0.00 0.00 0.05 0.00 0.00 0.00 0.05 TOT 7.66 3.67 2.45 2.13 2.49 2.18 3.36 10.70 12.97 9.84 5.76 4.67 10.75 8.21 6.26 6.89 100.00 0.00 0.95 2.18 46.58 33.83 9.71 6.76 100.00 Wind Direction by Stability I N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.14 0.23 5.67 1.41 0.23 0.00 0.00 0.00 0.05 2.86 0.77 0.00 0.00 0.00 0.00 0.00 1.68 0.63 0.09 0.05 0.00 0.00 0.00 1.13 0.82 0.18 0.00 0.00 0.00 0.00 J.09 0.59 0.32 0.50 0.00 0.00 0.00 0.32 0.54 0.77 0.54 0.00 0.00 0.05 0.50 1.00 0.77 1.04 0.00 0.09 0.09 2.63 3.76 2.63 1.50 0.00 0.14 0.23 4.72 5.76 1.32 0.82 0.00 0.09 0.41 4.63 3.81 0.41 0.50 0.00 0.05 0.32 2.90 2.18 0.27 0.05 0.00 0.00 0.09 2.36 1.90 0.32 0.00 0.00 0.27 0.27 4.13 4.85 1.09 0.14 0.00 0.14 0.27 4.49 2.18 0.68 0.45 0.00 0.05 0.18 3.17 1.72 0.45 0.68 0.00 0.00 0.00 4.31 1.90 0.18 0.50 0.00 0.95 2.18 46.58 33.83 9.71 6.76-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable IWind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.27 1.27 4.54 1.36 0.23 0.00 0.00 0.18 0.77 1.72 0.95 0.05 0.00 0.00 0.27 0.73 0.91 0.41 0.14 0.00 0.00 0.36 0.68 0.91 0.18 0.00 0.00 0.00 0.63 1.36 0.50 0.00 0.00 0.00 0.00 0.27 1.50 0.41 0.00 0.00 0.00 0.00 0.45 2.09 0.82 0.00 0.00 0.00 0.00 0.59 3.04 5.35 1.41 0.32 0.00 0.00 0.86 3.22 4.63 3.95 0.32 0.00 0.00 0.73 2.72 3.17 2.59 0.63 0.00 0.00 0.54 2.45 2.40 0.32 0.05 0.00 0.00 0.50 1.22 2.22 0.54 0.18 0.00 0.00 1.22 3.95 3.40 1.90 0.27 0.00 0.00 1.63 2.72 2.04 1.59 0.18 0.05 0.00 1.45 2.45 1.63 0.59 0.14 0.00 0.00 1.00 2.31 2.13 1.41 0.05 0.00 0.00 10.98 32.47 36.78 17.19 2.54 0.05-WIND SPEED CLASSES-CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-900o E TABLE 11-22-Byron Generating Station 30 ft. Wind Speed and Direction January-December, 2011 250Ft-3OFt Delta-I (F)Number of Observations

-8728 Values are Percent Occurrence SPEED ---CLASS N-------------------------------

WIND DIRECTION CLASSES.........

STABILITY CLASSES ..........

NNE NE ENE E ESE SE SSE I SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL I EU MU C SU A N IS MMS ES 1 EU MU I SU-N 3 S5 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.21 0.16 0.07 1g.02.01 I4 SU 0.01-N 1.16 SS 1.09 MS 0.39 ES 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.26 0.05 0.01 0.00 0.01 0.01 0.86 0.71 0.15 0.01 0.01 0.05 0.07 1.24 0.32 0.00 0.00 0.02 0.03 0.08 0.80 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.19 0.09 0.03 0.00 0.00 0.01 0.55 0.56 0.02 0.00 0.00 0.03 0.05 0.99 0.29 0.00 0.00 0.00 0.02 0.01 0.40 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.17 0.14 0.10 0.01 0.00 0.00 0.01 0.73 0.97 0.18 0.00 0.00 0.05 0.07 1.47 0.40 0.00 0.00 0.00 0.05 0.03 0.62 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.24 0.34 0.19 0.07 0.00 0.00 0.02 1.41 1.13 0.45 0.18 0.01 0.02 0.08 1.29 0.22 0.03 0.00 0.00 0.00 0.00 0.10 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.10 0.17 0.14 0.14 0.00 0.02 0.01 0.64 0.69 0.62 0.25 0.06 0.05 0.03 0.61 0.57 0.11 0.03 0.00 0.00 0.00 0.23 0.27 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.16 0.10 0.11 0.00 0.00 0.01 0.49 0.53 0.58 0.37 0.01 0.01 0.07 0.82 0.50 0.10 0.02 0.00'0.00 0.00 0.25 0.16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.13 0.13 0.21 0.00 0.00 0.02 0.57 0.73 0.81 0.36 0.00 0.02 0.02 1.09 1.21 0.71 0.13 0.00 0.00 0.00 0.52 0.29 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.21 0.17 0.17 0.00 0.01 0.01 0.77 0.80 0.63 0.31 0.00 0.07 0.10 1.59 1.26 0.22 0.03 0.00 0.02 0.11 1.04 0.79 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.24 0.37 0.21 0.00 0.01 0.08 0.71 0.85 0.32 0.19 0.00 0.08 0.03 1.16 1.09 0.03 0.00 0.00 0.02 0.09 0.85 0.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.27 0.31 0.14 0.00 0.01 0.03 1.01 0.91 0.13 0.02 0.00 0.02 0.14 1.33 0.84 0.00 0.00 0.00 0.01 0.00 0.40 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.27 0.30 0.08 0.00 0.00 0.02 0.88 0.77 0.08 0.02 0.03 0.05 0.16 1.02 0.66 0.00 0.00 0.01 0.00 0.01 0.42 0.14 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.01 0.00 0.00 0.00 0.30 0.36 0.42 0.18 0.00 0.00 0.03 1.19 0.97 0.23 0.01 0.00 0.05 0.07 1.09 1.09 0.03 0.00 0.05 0.15 0.11 0.94 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.42 0.40 0.37 0.00 0.01 0.07 1.02 1.07 0.14 0.00 0.01 0.02 0.06 1.50 0.61 0.00 0.00 0.06 0.16 0.11 0.97 0.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.47 0.38 0.41 0.00 0.02 0.03 1.46 1.16 0.13 0.05 0.01 0.02 0.15 1.92 0.32 0.00 0.00 0.00 0.02 0.06 0.41 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.30 0.37 0.25 0.00 0.00 0.02 1.46 1.11 0.27 0.07 0.02 0.05 0.05 1.46 0.19 0.00 0.00 0.00 0.02 0.07 0.53 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.05 0.00 0.02 0.00 0.00 0.00 0.02 2.29 4.15 3.68 2.46 0.02 0.02 0.11 0.42 14.91 14.05 5.13 1.87 0.18 0.18 0.62 1.27 21.13 9.89 1.29 0.22 0.00 0.07 0.05 0.00 0.02 0.14 0.00 0.02 2.29 4.15 3.68 2.46 12.60 0.00 0.11 0.42 14.91 14.05 5.13 1.87 36.51 EU MU SU N SS MS ES 0.01 0.03 0.13 2.55 0.31 0.05 0.00 0.62 1.27 21.13 9.89 1.29 0.22 34.60 EU 0.00 11 MU 0.01 3 SU 0.00-N 0.80 1 SS 0.01 MS 0.00 ES 0.00 0.14 0.53 0.70 9.29 2.77 0.07 0.00 0.14 0.53 0.70 9.29 2.77 0.07 0.00 13.50 Murray & Trettel, Inc. 600 First Bank Driue, Suite A Palatine, Illinois 60067 (847)963-9o00 I TABLE 11 continued-23-Byron Generating Station 30 ft. Wind Speed and Direction January-December.

2011 250Ft-3OFt Delta-T (F)m SPEED ----------------------------------

WIND DIRECTION CLASSES ----------------------------------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL---------

STABILITY CLASSES ..........

EU MU SU N SS MS ES TM I EU i MU 9 SU-N 2 SS 4 M IES EU TSU N I:S ES 0.00 0.00 0.00 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.21 0.00 0.00 O..00O-00 0.00 0.00 0:00 0.00 0.00 0.00 0.00 0.00 0.00 Q.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.09 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.10 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.02 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.03 0.18 0.10 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.01 0.10 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.02 0.06 0.44 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.02 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.02 0.02 0.14 1.91 0.36 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.01 0.00 0.00 0.02 0.14 0.36 0.00 0.00 2.45 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.01 0.00 0.00 0.06 99.86 TOT 7.28 4.92 3.63 5.33 5.83 4.84 4.56 7.24 8.64 7.25 5.74 5.27 8.09 7.42 7.21 6.50 99.86 0.37 1.28 2.55 49.64 31.27 10.17 4.57 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.03 0.06 0.14 4.74 1.62 0.60 0.09 0.03 0.09 0.16 3.07 1.34 0.19 0.02 0.00 0.06 0.07 2.26 1.10 0.11 0.03 0.00 0.09 0.13 3.21 1.60 0.29 0.01 0.01 0.02 0.10 3.05 1.72 0.68 0.25 0.06 0.07 0.06 1.60 1.74 0.88 0.42 0.01 0.01 0.08 1.79 1.37 0.79 0.50 0.00 0.02 0.08 2.38 2.38 1.68 0.69 0.00 0.10 0.23 3.67 3.08 1.04 0.52 0.00 0.11 0.24 3.04 2.74 0.72 0.40 0.00 0.05 0.17 2.85 2.07 0.44 0.16 0.05 0.05 0.21 2.59 1.90 0.38 0.10 0.07 0.22 0.27 3.95 2.68 0.69 0.21 0.07 0.19 0.24 3.82 2.20 0.54 0.37 0.01 0.07 0.24 3.95 1.97 0.50 0.46 0.02 0.07 0.14 3.61 1.70 0.64 0.32 0.37 1.28 2.55 49.64 31.27 10.17 4.57-STABILITY CLASSES-Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately Stable Extremely Stable W wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 0.00 0.55 2.70 3.08 0.82 0.11 0.00 0.00 0.42 1.75 1.68 0.99 0.07 0.00 0.00 0.44 1.15 1.35 0.49 0.19 0.01 0.00 0.44 1.90 1.98 0.79 0.21 0.01 0.00 0.85 3.20 1.66 0.13 0.00 0.00 0.00 0.56 2.23 1.47 0.52 0.05 0.01 0.00 0.50 1.98 1.55 0.41 0.11 0.00 0.00 0.56 2.50 3.19 0.84 0.16 0.00 0.00 0.65 2.53 3.28 1.99 0.17 0.01 0.00 0.95 2.17 2.39 1.42 0.32 0.00 0.00 0.82 2.11 2.33 0.46 0.02 0.00 0.00 0.81 1.78 1.92 0.58 0.17 0.00 0.00 1.26 2.44 2.33 1.44 0.61 0.00 0.00 1.35 2.30 2.20 1.39 0.17 0.01 0.00 1.37 2.84 2.43 0.52 0.05 0.00 0.00 1.05 2.93 1.76 0.71 0.03 0.00 0.14 12.60 36.51 34.60 13.50 2.45 0.06-WIND SPEED CLASSES-'CALM< 3.5 mph 3.6 -7.5 mph 7.6 -12.5 mph 12.6 -18.5 mph 18.6 -24.5 mph> 24.5 mph Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo 5.5 Precipitation Monthly totals and the maximum 24-hour and maximum 1-hour precipitation amounts are summarized below. The month with the most measured precipitation was July. The month with the least measured precipitation was January*.

The maximum 24-hour total was 2.85" (September*)

and the maximum 1-hour total was 1.01" (May).Table 12 Precipitation Totals (Inches) -2011 Byron Site Maximum Maximum Month Total 24-hour 1-hour January 0.77* 0.49* 0.07*February 1.90* 0.77* 0.22 March 2.24 0.73 0.25 April 3.64* 0.66* 0.21*May 4.86 2.49 1.01 June 2.64 1.03 0.51 July 5.84 1.34 0.67 August 4.35 1.30 0.82 September 4.48* 2.85* 0.46*October 1.60 0.73 0.34 November 4.09 1.28 0.30 December 2.05* 0.87* 0.11*TOTAL: 38.46** some data are missing -actual precipitation may be under-reported Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9ooo 5.6 Doses Resultinq from Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases.Unit 1: Dose gamma air (1)beta air (2)whole body (3)skin (4)organ (5) (child-bone)

Maximum Value 3.610 x 106 mrad 3.690 x 10-6 mrad 6.222 x 10.2 mrem 4.440 x 10"6 mrem 3.065 x 10.1 mrem Unit I Compliance Status 10.CFR 50 Appendix I Yearly Objective Sector Affected North-Northwest North-Northwest North-Northwest North-Northwest North-Northwest

% of Appendix I 0.00 0.00 1.24 0.00 2.04 gamma air beta air whole body skin organ 10.0 20.0 5.0 15.0 15.0 mrad mrad mrem mrem mrem Unit 2: Dose gamma air (1)beta air (2)whole body (3)skin (4)organ (5) (child-bone)

Maximum Value 5.070 1.230 6.351 7.820 3.043 x x x x x 10"6 mrad 10"6 mrad 10.2 mrem 10"6 mrem 10-1 mrem Sector Affected North-Northwest North-Northwest North-Northwest North-Northwest North-Northwest

% of Appendix I 0.00 0.00 1.27 0.00 2.03 Unit 2 Compliance Status 10 CFR 50 Appendix I Yearly Objective gamma air beta air whole body skin organ 10.0 20.0 5.0 15.0 15.0 mrad mrad mrem mrem mrem I)(2)(3)(4)(6)Gamma Air Dose -GASPAR II, NUREG-0597 Beta Air Dose -GASPAR II, NUREG-0597 Whole Body Dose -GASPAR I1, NUREG-0597 Skin Dose -GASPAR II, NUREG-0597 Inhalation and Food Pathways Dose -GASPAR II, NUREG-0597 Murray & Trettel, Inc. 6oo First Bank Drive, Suite A Palatine, Illinois 60067 (847)963-9ooo I I I I i APPENDIX I I.I i I I I Murray & Trettel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 Exelon Contract Number 455465 F4 R-28 7/10)Byron Meteorological Calibration Page 1 of 8 Date: .POWER SUPPLIES+12.OOOV +/- 2.000V+13.-13 V Data Logger System Check: Expected Data Loaaer Specifications Expected Data Loaaer Specifications 30'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph 6,3 mph i .74 mph.23,12- mph 15",q3 mph ,i 7"7,, mph+/- 0.4 mph+/- 0.4 mph+/- 0.4 mph+/- 0.4 mph+/- 0.4 mph 30'WD 00 90°1800 270°360°250' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Ohms TLo 30' TEMP 40.670 250' TEMP 40.670 ATMid 250'"30'3 j mph +1- 0.4 mph.mph +I-0.4 mph 23, )1?- mph +I- 0.4 mph'-1, q3 mph +l-0.4 mph mph +1-0.4 mph Expected 23.0°F 23.0°F 0.0°F 250'WD 0°900 180°2700 3600 Data Loaaer z7,q 7 o, OL 0 go, 0 0 9o.1 *Specifications

+1- 0.50+1-0.50+1-0.180+/.-2°+/- 20+/-20+1- 2"+/- 2"+/-2'+/- 20+/-2'+/-20+1- 20+/.-20+/- 20 T Hi 30' TEMP 250' TEMP A TMId 250'-30'30' TEMP 250' TEMP ATLo 250'"30'30' TEMP 250' TEMP ATHI 250'-30'12.174 12.174 34.890 40.670 40.670 34.890 100.OOF I 00.0*F 0.0'F 320 0 OF 23.0'F-9.0'F 23.0*F 32.0'F 9.0 0 Fq.9q.qq 0 3, q,5 .q,O .+/- 0.50+/- 0.5'+/- 0.180+/- 0.50+/- 0.50+/- 0.180+/- 0.50+I- 0.50+1- 0.180 0 Bi 96 -900 I Murray & Trette/, Inc.

  • 600 First Banic Drive, S,,ite A .P,,anne, Illinois .60067 1I (847) 963.9000 Exelon Contract Number 455465 F5 R-28 7/10 Byron Meteorological Calibration Page 2 of 8 I Date: 1-10-l1 Measured Recorded Difference Specification 30' Ambient.AF AL U 0.A50FF t0.5 0 F TOWER MEASUREMENTS Ambient [:] ice Bath Temperatures 250' A T AF AL-,__SOF -OF-1.1F --OF°F -_ °F+0.18°F OF oF OF 30' Dew Point AF AL 00 '...I F °F-OF I'5 7 0 F -°F:12.7°F WS stall Forw. WD Revr. WD 30'AF AL Q.Lmph Q3mph Winds 250'AF AL O0. mphQmph 3L A4 Specification 0.3mph + 0.45mph 300/3900 1 50 2100 +/- 50 Tracking/wear Comments: 201 VDý -ýD' v (-ýI So 'WL)I Vý " W/C I -----~ I ---K4Toh A:,* *LJL frrrcc') ifl W~4LW.) I M*m~..~uU

'm -.- I -- ..-.-. ..... .. .. .M T( B :-t~ATOO'~7

{Iai MTl* 16 (EnvM1s I MTO(De,-1 n11,Q4 tff4LQ0J1QLevfed I. ..-1 I 1hdrk~ Lmf f-tcJ i Muriay & Tretzel, Inc.

  • 600 First Bank Drwe, Suit A .Palatine, IWnois , 60067 3 (847) 963.9000 Exelon Contract Number 455465 F6 R-28 7/10 Byron Meteorological Calibration Page 3 of 8 Date: I-j isl Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 mos.) Wind Speed: )i12i I Iz/L-J_(12 mos.) Wind Direction:

i ---1 30' 250'* Aspirators:

Q " Operation of Heat Lamps: 0 SOperation of Rain Gauge: b* Tips Poured S" Tips Recorded Debris screen: In Installed Removed UPS Check: 0-Tower Lighting Good Fair Poor Tower Condition Good Fair Poor)Beacon Side lights Wiring Flasher[Y] 1: 1 Paint 0-1 Shelter condition I Note: Calibration Instruments:

Next Cal Due AF = As Found Psychrometer-S/N -2i- ( A'PJL Zý1I AL = As Left Digital multimeter

-SIN -8'7 ý, 00, I..-- = no change (AF=AL) Digital multimeter

-S/N -FS Full Scale Technicians:

M_____.-_______

_ /_I Comments: U.,.Signature:

i1'Y*Murray & Trecttl, Inc. -600 First Bank Drive, Suite A -Palatine, Illinois -6006 7 9 (84 7) 963-9000 Exelon Contract Number 455465 7/System Response Check Page 4 o0 Date: f-/0-/ /Site: Byron System: Digital Recorder Low Scale CH 1-0.4 CH2 .l CH3U0.4 CH4 +/-1 CH5 -0.5 CH6 +/-0.18 CH7 +/-0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 0.0 MPH 0 DEG 0.0 MPH 0 DEG -22.0 DEG -10.00 DEG -22.0 DEG 0.00 IN Response ..As Found Response 0 6 .D -2z .03 -/D,.O -Z2. -D3 DO..As Left -Response .Mid Scale CH I 0.4 CH2 01 CH3 +/-0.4 CH4 Cl CH5 -0.5 CH6- 0.18 CH7 +/-0.5 CH8 -0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.0 MPH 270 DEG 50.0 MPH 270 DEG 50.0 DEG 0.00 DEG 50.0 DEG 0.50 IN Response As Found Response 2,. 4q-1 .. .3- ( 0-5(-)As Left ------Response ....Full Scale CH 1-0.4 CH2 +1 CH3 +/-0.4 CH4*1 CH5 +/-0.5 CH6 +/-0.18 CH7 *0.5 CH8 *0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 100.0 MPH 540 DEG 100.0 MPH 540 DEG 122.0 DEG 10.00 DEG 122.0 DEG 1.00 IN Response As Found Response 939 121 sq '?q 1 939 7 12.1 -79971 1/00 1 As Left " -' -....Response Murray & TrettA/, Inc.

  • 600 Firat Bank DBi e, Suiet A .PaLatine, Illinois.

60067 2 (847) 963-9000 m-min--- momtramtmNmbe m m --Exelon Contract Number 455465 7j Page 5 c System Response Check Date: (t-0O-1/Site: Byron System: Data Logger Low Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Check Expected 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 +/-2 -22.00+/-0.5

-10.00+/-0.18

-22.00 +/-0.5 O&S+/-0.01 Response As Found Response 0.0- C,.,, o.O) -zZ.Od ~ (0.oL -Z2 ,.os As Left ------ ..-- ----Response .....Full Scale 1omWS 10m WD 60m WS 60m WD 10m T 60m AT lom DP Check Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540:+/-2 122.00 +/-0.5 10.00 +/-0.18 122.00 +/-0.5 Response ....As Found Response (eo.oe.) 9-4o.oC (oo= ' I2, Y io. DO IZ.o'As Left -.....Response MTsa, & Trettel, Inc. 600 Fi,,t Bank O WA -Palatne,,Ill.

inus .60067 2 (847) 963-9000

-C onta -m m m m -4 Exln otrc ume 456 7/Page 6 o System Response Check Date: / -/O-(,/Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 0 +/-2 0.0 +0.4 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0 +/-2 0.0 +/-0.4 Response ....As Found C) ,3 _ -_ ,-- 0.1(0 Response As Left Response Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 270 +/-2 50.0 +/-0.4 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 270 +/-2 50.0 +/-0.4 Response As Found qq .9 Response Z(05.2- 0_..0_0 51.0 _."._ __9,_As Left -Response F_-O"'_ ,.._-"__., Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 540 +/-2 100.0 +/-0.4 Response As Found LA1 Response 5"3$L" /O6,O 101 7. I 13.0 .As Left K -.Response I _ _1 1 2-1 -*_- _., _ _-_"---it 141qr) *(,'.ý Z,;ý'We C,,,,,jhT V-AfO-'kif 4 1-` )4A C' -10 TI~Murwra & Trette, Inc. .600 First Bank Drive, Suite A .Palatine, llinais .60067 9 (847) 963.9000

-m Cna Nummbe m m 4 Exeloni Contract Number 455465 Mm M F R.71 Page 7 c System Response Check Date: /-iO-H Site: Byron System: Process Computer -Y401 1 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 +/-2 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0.00 +/-0.01 Response As Found Response -Z"-, --'\ 0.0 --ZZ.. -.,cA -..< O.O As Left ---- _.-Response Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270 +/-2 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 0.50 +/-0.01 Response As Found Response _____ 266--Z ,a .0 ___,___ .q._7 _ .__-__As Left .,_Response Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' ,T 30' DP Precipitation Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 1.00 +/-0.01 Response As Found -Response 10"-. -., ,, As Left -, -- .Response ,_ _ _ _ _-I-c-/I Murray & Trectel, Inc.

  • 600 FAt Bank De rte A- Palatine, Illinois.

60067 W (847) 963-9000 m~~~~M MM M- M M-W Exelon Contract Number 455465 R.7 Page 8 System Response Check Date:________

Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected 0.0 +/-1.0 0.0 +/-1.2 0 +/-5 0:+/-5 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 Response As Found --Response "--___" _ -- z. -As Left .., -Response Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected 50.0 +/-1.0 50.0 +/-1.2 270+/-5 270 +/-5 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 Response _ __As Found.Response L,9 .7 Z72., "3 q. L q. ",.As Left _ , ..Response Full Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Chexck Expected 100.0 +/-1.0 100.0 +/-1.2 540 +/-5 540 +/-5 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 Response...

As Found Response , SN-) ___ ,_ /20., As Left ....--- --,z'Response _ _Murray & Treuel, Inc. .600 Art Bank Driue, Suite A .Palatine, Illinois .60067 2 (847) 963.9000 Exelon Contract Number 455465 F4 R-28 7/10 Byron Meteorological Calibration Page 1 of 8 Date: '-,-U POWER SUPPLIES+ 12.OOOV +/- 2.OOOV+15.q17 v Data Logger System Check: Expected 30'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Loaaer 1,3( mph 1 .1 ý- mph 2,3., r)- mphmphmph Specifications

+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+/- 0.4 mph+1- 0.4 mph Expected Data Loaaer Specifications 30' WD 00 900 1800 270" 360" 0.i Zf 0 Yo 0t-7 F -9 0+/-20+/- 2*+/- 2*+/-20+1-20+1-20)250' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Ohms T Lo 30' TEMP 40.670 250' TEMP 40.670 A TMid 250'-30'30. .mph +l-0.4mph i .74 mph +/-0.4 mphI12 mph +I-0.4 mph1- mph +1- 0.4 mph TJU5( mph +1-0.4 mph Expected 23.0*F 23.0"F 0.0OF 250'WD 0°900 1800 2700 360" Data Loaaer f), 01 0 q0. 13 *i go..ot. 0 34.?9/ 0-3.5-1, 7 -o Specifications

+1- 0.50+1- 0.50+/-0.180 T Hi 30' TEMP 250' TEMP A TMid 250'-30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP ATHI 250'-30'12.174 12.174 34.890 40.670 40.670 34.890 100.0°F 100.0"F 0.0"F 32.0°F 23.0°F-9.0 0 F 23.0°F 32.0°F 9.0 0 F o..0 ,(0to+/- 0.50+/- 0.50+/- 0.180+/- 0.50+1- 0.50+/- 0.180+/- 0.50+1- 0.50+1- 0.18*0 Murray & Trettek Inc. -600 First Bank Drive, Suite A Palatin, Illinois .60067 9 (84'7) 963.9000 AaL I , b" I Exelon Contract Number 455465 F5 R-28 7/10 Byron Meteorological Calibration Page 2 of 8 Date: S-- -I Measured Recorded Difference Specification 30' Ambient.AF AL 5O,75OF O__F O,.F -.. _.F-AS F ____°F+/-0.5°F TOWER MEASUREMENTS 0 Ambient [0 Ice Bath Temperatures 250' A T AF AL' {'A/OF _.OF.-I,-0-'F ___°F rLl OF °F QO 0 1F __F_+/-0.18 0 F Winds 250'AF AL 0 , mph mph 3qa -0_---2K I'I I I I 30' Dew Point AF AL 3 9,°0F ___ °F 3 7.15OF -__0 F 1).7O--)F O+/-27 0 F Specification 0.3mph +/- 0.45mph 300/3900 +/- 50 2100 +/- 50 30'AF AL WS stall 03 _mph _mplýForw. WD ° * .-Revr. WD 0 _ ..Tracking/wear Comments: kW5 45A)E1r~. , 1 sASffI(Cd)

S i ~Murra &7f Trettel, Inc. *600 Fi~sz Bank Drwue, SuiteA. Palatin, Illinois .60067 2 (847) 963.9000 A-,L. 7- la I Exelon contract Number 455465 F6 R-28 7/10 Byron Meteorological Calibration Page 3 of 8 Date: 5S'- I k 0 Dates of Last Wind Sensor Bearing Replacements:

30'(6 mos.) Wind Speed: -i-(12 mos.) Wind Direction:

9-. Xý4- I I 250'I30' 250'Aspirators:

6 Y- Pic___I.Operation of Heat Lamps: IVA Operation of Rain Gauge: 0K. Tips Poured .Tips Recorded Sr Debris screen: In Out 4 Removed UPS Check: ______Tower Liohting Good Fair Poor Tower Condition Good Fair Poor) Beacon ] D D Paint (71 0 4 Side lights [1 0 0:1 Wiring D11 0 Flasher .91 [l I I-- Shelter condition 171 0 0 I Note: AF = As Found AL = As Left no change (AF=AL)FS = Full Scale Technicians:/-A P_./ g ,,oM. ie IM A iA Comments: Calibration Instruments:

Next Cal Due Psychrometer

-S/N -$ 1 C.T 2-01 1 Digital multimeter-S/N -%988dZ4q, hc T 2 ", Digital multimeter

-S/N -I Mu~y & Tret~ Inc ~ Signature:

IMurray & Trettel, Inc.

  • 600 First Bank Drive, Suite A .Palatine, 11.1inois.-

60067 9 (847) 963.9000 S"- -- -C-- , --- -------Exelon Contract Number 455465 R 7 System Response Check Page 4 Date: 5-_- _ (Site: Byron System: Digital Recorder Low Scale CH 1+/-0.4 CH2 *1 CH3+/-0.4 CH4 +1 CH5 +/-0.5 CH6 +/-0.18 CH7 -0.5 CHO *0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 0.0 MPH 0 DEG 0.0 MPH 0 DEG -22.0 DEG -10.00 DEG -22.0 DEG 0.00 IN Response As Found Response 0.0 C. 2,O" "-lL',OC) -Z2Z;? (22 ,- C As Left Response --_Mid Scale CH 1+/-0.4 CH2:+/-1 CH3 -0.4 CH4*1 CH5 +/-0.5 CH6 +/-0.18 CH7 +/-0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.0 MPH 270 DEG 50.0 MPH 270 DEG 50.0 DEG 0.00 DEG 50.0 DEG 0.50 IN Response As Found Response 4L q.(0-- __ __ _._ _ q 07-. -L 0.As Left --.. -Response Full Scale CH 1+/-0.4 CH2:11 CH3 +/-0.4 CH4 *1 CH5 +/-0.5 CH6 +/-0.18 CH7 -0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 100.0 MPH 540 DEG 100.0 MPH 540 DEG 122.0 DEG 10.00 DEG 122.0 DEG 1.00 IN Response As Found "" .(7 /Response 5'39' .' 9.; -S91 7.5." 217 As Left -.-Response ___..Murray & Treude, Inc.

  • 600 Fine Bank Drive, Suite A. Palatine, Illincis .60067 2 (847) 963.9000 Exelon Contract Number 455465 R 7 Systemn Response CheckPae Date: __-_ __ _Site: Byron System: Data Logger Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250' AT 30' DP Check Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270 +/-2 50.00 +/-0.5 0.00 +/-0.18 50.00 +/-0.5 Response ....As Found Response .OC Z)O. V t'*) O.VL)As Left .....Response Fun Scale IomWS 10m WD 60m WS 60m WD 10m T 60m AT 10m DP Check Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540:+/-2 122.00 +/-0.5 10.00 +/-0.18 122.00 +/-0.5 Response As Found Response (to) 00.o (90 (.64o.0-) 0( /) (11, Occ As Left ....-Response ..P Muyray & Trctte, Inc. -600 First Bank
  • iteA. Palatine, Illinois-60067 2 (847) 963.9000 M lIr M m m-N m -- m m N Exelon Contract Number 455465 R 7 System Response Check Page 6 Date: -"' I Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 0+/-2 0.0 +/-0.4 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0 +/-2 0.0 +/-0.4 Response .As Found 0, Response ,, .41 -i All 21.O ", As Left Response Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 270 +/-2 50.0 +/-0.4 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5. 270 +/-2 50.0 +/-0.4 Response As Found Response -')tfC1iO55 3L9,j As Left ---Response Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 540 +/-2 100.0 +/-0.4 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 540 +/-2 100.0 +/-0.4 Response R As Found /i 00' Response ..-392-As Left ----Response ,.A .L -7 6 0-a Murray & Tvetul Inc. -600 Fiat Bank Driue, Suitea A.- Palaine~, Iffinois -60067 W (847) 963.9000 n m -n xmlnn C r Nb 45 Exeloni Contract Number 455465 M m R 7 Page 7 System Response Check Date: S--(, -I Site: Byron System: Process Computer -Y4011 -Y4019 Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270:+/-2 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 0.50 +/-0.01 Response ._As Found Response L__.-- 2..-I L. q. -46S.8, L-q. LO( .--I, -As Left ..-.-Response Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.0 +/-0.5 10.00 +0.18 122.0 +0.5 1.00 +0.01 Response .0 As Found Response 6, :-1 OA;,-- -0I0. OLk -j- I --1 ,1.00 As Left -Response .....AS 74-b-11 0 Murray & Trettel, Inc. -600 Fiit Bank
  • iste A. Palatine, IlUinois.

60067 9 (847) 963.9000 S- --- MMMM M M -Exelon Contract Number 455465 R 7 System Response Check Page 8 Date: -) (Site: Byron System: Control Room Indicators Low Sca 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Checkte Expected 0.0 +/-1.0 0.0 +/-1.2 0 +/-5 0 +/-5 -22.0 +/-0.5 -10.00*0.18

-22.0 +/-0.5-Response ,. .As Found Response -O' 0.0 , 0.0 --L c-2-(,-As Left-Response

....Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected 50.0 +/-1.0 50.0 +/-1.2 270 +/-5 270:+/-5 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 Response As Found Response ' q.1 2r?2" 1 o _______ ___ __As Left .---Response __Full Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected 100.0 +/-1.0 100.0 +/-1.2 540 +/-5 540 +/-5 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 Response As Found R e s p o n s e 0/ 0 , L 2 5 7 _ _-3 7_ _ _ _ _ ,_ _ _ _ _As Left --Response , Muzrra & Trettel, Inc.

  • 600 Fint Bank Drive, Suite A .Paiatine, lllnois .60067 W (847) 963-9000 Exelon Contract Number 455465 F4 R-28 7/10 I Byron Meteorological Calibration Page 1 of 8 Date: 9.L(POWER SUPPLIES+12.OOOV +/- 2.OOOV+ 13 ,i.,'7 v Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Loaqer S,3O .mph.mph mph 1% l,'-, mph S, .mph Specifications

+/- 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph 30'WD Expected Data Loqaer 0' *_ _ _- _ _900 0,11 0 1800 (-21. 11 2700 *3600 "' 5, q? (v _Specifications

+/- 20+/- 2'+/- 20+/-20+/- 20)250'WS 0,3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Ohms) 30' TEMP 40.670 250' TEMP 40.670 a'3 mph I/-lb mph ,Z$2- mph q-.q3 mph Expected 23.0'F 23.09F 0.0'F+/- 0.4 mph+/- 0.4 mph+/- 0.4 mph 0.4 mph+1- 0.4 mph 250'WD 00 90'1800 270'360" Data Loppqer 0 00 0. 7-ý3,51,7 Specifications

+1- 0.5+1- 0.50+1- 0.180+/-20+/- 20+1- 2'+1- 2'+/- 20 TL(A TMid 250'-30'T HI 30' TEMP 250' TEMP ATMid 250'-30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP ATHI 250'-30'12.174 12.174 34.890 40.670 40.670 34.890 I 00.OOF I 00.0'F 0.0'F 32.0'F 23.0'F-9.0'F 23.0"F 32.0'F 9.O'F*0 D,- 90 *C), 00 R. q3+/- 0.50+1- 0.5'+/- 0.180+/- 0.56+/- 0.5"+/-0.18'+I- 0.50+/- 0.5'+1- 0.180)Aa lo-'4-11 m Murray & Trettel, Inc. , 600 Fint Bankc Drive, Suite A .Palatine, Illinois .60067 2 (847) 963.9000 m -- -

Exelon Contract Number 455465)F5 R-28 7/10 Byron Meteorological Calibration Page 2 of 8 Date: q -Z I 30' Ambient.AF AL Measured '70.0 OF OF Recorded T?,'744 OF -F Difference , " O' 0 F -F Specification 0.5 0 F TOWER MEASUREMENTS Ambient r-Ice Bath Temperatures 250' A T AF AL 6. Z" OF O-_F-OZI OF 'OF 4O( OF " °F:+/-O.18 0 F 30' Dew Point AF AL to oF 0oF 67.47 .oF OF.33 OF _"_OF+/-2.70F 30'AF AL WS stall ,, m ph Forw. WD 541( 369 0 Revr. WD 2S" 0 4 0 Tracking/wear b L Winds 250'AF AL 3mph Mph 3q10 -0 0t 0 Specification 0.3mph +/- 0.45mph 300/3900 +/- 50 2100 +/- 50 Comments: r4 ST VA I I C 9 C M0,.5 L, ,("-% OAOH k.7 ZDtqo WSJ 1&;. r It 6 b 7161 I I.Muray&Trettel, Inc.

  • 600 First Bank Drive, Suite A. Palatine, Illinois .60067 2 (847) 963-9000 4m, 1 Ou -I I Exelon Contract Number 455465 F6 R-28 7/10 Byron Meteorological Calibration Page 3 of 8 Date: /Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 mos.) Wind Speed: I. Z7--"l _ _- z."_(12 mos.) Wind Direction:

I Z.- l( l, t, t ,(1 30' 250'i Aspirators:

19K 6--Operation of Heat Lamps: 6 IK,, I Operation of Rain Gauge: x- Tips Poured !5 Tips Recorded ....Debris screen: On Out Installed Removed UPS Tower Lightina Good Fair Poor Tower Condition Good Fair Poor!) Beacon E7 0 0 Paint ! 0" -Side lights E l- 0 I Wiring in' El 0]Flasher 0 0 Shelter condition 17i 0 0 N Note: Calibration Instruments:

Next Cal Due AF = As Found Psychrometer -SN- IC -T Z1 (AL = As Left Digital multimeter

-SIN -£9 IQ'O , 2,(R 01f.o-= no change (AF=AL) Digital multimeter

-S/N -FS = Full Scale Technicians:

' l d /i , "DhKA E MAe4'_" Comments:__ _Signature: Murray & Trettel, Inc.

  • 600 First Bank Drive, Suite A .Palafine, Illinois .60067 2 (84 7) 963.9000 W~ 1,-a-1,-

~ m ---Exelon Contract Number m mR vm 455465 0 -7.System Response Check Page 4 c Date: _ -_____Site: Byron System: Digital Recorder Low Scale CH 1+/-0.4 CH2 +1 CH3U0.4 CH4 +/-1 CH5 +/-0.5 CH6 +/-0.18 CH7 +/-0.5 CH8 +/-0.01 Check 30' WS 30& WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 0.0 MPH 0 DEG 0.0 MPH 0 DEG -22.0 DEG -10.00 DEG -22.0 DEG 0.00 IN Response ....As Found Response...

12, 0 -2 .b-3 -I0.0( .00 As Left .J -_ -.Response -Mid Scale CH 1+/-0.4 C12+/-1 CH3 +/-0.4 CH4 +/-1 CH5 +/-0.5 CH6 +/-0.18 CH7 +/-0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.0 MPH 270 DEG 50.0 MPH 270 DEG 50.0 DEG X 0.00 DEG 50.0 DEG 0.50 IN Response I As Found I Response __ _ 2., 0 -0 qq -"' oO As Left ....Response -" * .-Full Scale CH 1l0.4 CH2+/-1 CH3 -0.4 CH4 +/-1 CH5 +/-0.5 CH6 +/-0.18 CH7 +/-0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip ExpectedI Response 100.0 MPH 5410 DEG 100.0 MPH 540 DEG 122.0 DEG 10.00 DEG 122.0 DEG 1.00 IN As Found S Response _,___- '(9. 9,3 IZ- -As Left R_ _ _ _ __e_-"sponse_

_"__ _ _ __ _ -- _ _ _* 5--e 'j. I-AJý 7-Muway & TTetrel, Inc. -600 Fin Bank Drive, Suit A. Palatine, Iirnois .60067 3 (847) 963.-9000 A' lo -w.- it Sm m M M -----m Exelon Contract Number 455465 7j System Response Check Page 5 c Date: q -(ýSite: Byron System: Data Logger Low Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Check Expected Response 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 +/-2 -22.00+/-0.5

-10.00+/-0.18

-22.00 +/-0.5 .0: ++/-0.01 As Found Response 0,00 Co, c C) C). D6o -z c. ) -/o.0 & 2_2.. 06 As Left -.-_.Response Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250' &T 30' DP Check Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270 +/-2 50.00 +/-0.5 0.00 +/-0.18 50.00 +/-0.5 Response As Found Response Do ,'?C),O, gZ)..D) .j .b) 0 ,ibc.)As Left Response Full Scale 10m WS 10m WD 60m WS 60m WD 10m T 60m AT 10m DP Check Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.00 +/-0.5 10.00 +/-0.18 122.00 +/-0.5 Response As Found Response /bO, PO S-40,$ ' iO, ;-Di.) CO... 00O-,-o Lro/Z.2,Z

)As Left -- .-- ---Response ._.Mu,,ray & Trcttel, Inc. -600 Fint Bank D ite A .Palatne, Illinois -60067 W (847) 963-9000 A5L S!ele1@ont ac NM r455465 M M mR-21 7111 System Response Check Page 6 of 9 8 0 8 Date: //Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 kV Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 0 +/-2 0.0 +/-0.4 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0 +/-2 0.0 +/-0.4 Response As Found Response C _._ _ O- -(0-o -2?.? -oI As Left I -Response __Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 W Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 270 +/-2 50.0 +/-0.4 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 270 +/-2 50.0 +/-0.4 Response As Found Response _,__. _.-_, ___ .O.bq.__" ___ _._As Left Response q----- _Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 -14 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 540 +/-2 100.0 +/-0.4 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 540 +/-2 100.0 +/-0.4 Response As Found q______o. _ _ _ _ _ _ __ _ _ _ _ _ _ _ /)_/. (S z. ____. _As Left -.-Response ____*___XX pcA ..oE 0 A-SL 10 --aG- I I Munay & Treztel, Inc.

  • 600 FiAm Bank Drive, Suite A .Palatine, llinois .60067 9 (847) 963.9000 l~xe1%"on~r Nu~r 455M465M M Fl R-2 711 System Response Check Page 7 of C C Date: q-2-(Site: Byron System: Process Computer -Y4011 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 XY4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 +/-2 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0.00 +/-0.01 Response __As Found 6 l.">Response 6-jO 10 "-T3 Z O.z -_ .c:.,o As Left --Response 0 .3 -c .OO Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 -* Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270+/-2 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 0.50 +/-0.01 Response As Found y,.. 4qO Response 92. % ZLFt.2. .L7jq .?I. " ,r" -__,7 _ .___-__As Left ---Response ____. L_ -e5.Full Scale Y4011 Y4012 Y4013 -X Y4014 Y4015 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.0 +/-0.5 10.00 +/-0.18 122.0 +0.5 1.00 +/-0.01 Response As Found &AL_Response 166.7 !94 1 _/.03 As Left Response 10 -x ) 0/fo 0 iM 1 OOW~IJ 4--VCL:vTL-rA<Y-e
  • T3ht 'S 4T r C-Arj L-JLis ef//VeeO EXCIL , %4-r0 K.l I Muvyay & Trettel, Inc. .600 Fiisc Bank Dni
  • A. Palatine, Inois .60067 9 (847) 963-9000 -A61~- 10 -a"-II xelWonffl NO~r 4 5 M! M ý0 Fl1 R-21 711 System Response Check Page Bat I Date: 9-2--( 0 Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Checkte Expected 0.0 +/-1.0 0.0 +/-1.2 *r -0 +/-5 0 +/-5 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 Response As Found Response so.. o. --As Left Response Mid Scale 30' WS 250' WS
  • k 30' WD 250' WD 30' T 250' AT 30' DP Chect Expected 50.0 +/-1.0 50.0 +/-1.2 270 +/-5 270 +/-5 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 Response As Found Response tiN ,.fqq ___, __ "l (,.z, -t._As Left _--Response so_,,-__ _ __--__-Full Scale 30' WS 250' WS X ¥ 30' WD 250' WD 30' T 250' AT 30' DP Check Expected 100.0 +/-1.0 100.0 +/-1.2 540 +/-5 540 +/-5 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 Response As Found ?.______ _ q. 9 /22-0 Response so_ _ B 1.&Z ___.___ ___.__As Left--Response A: r -7z) l1- A~ep#f 1CE1ct- en/ei 5raq7z/)(e- oS Y9) q W 5 L4I- )LA.j i -ri -*-f ) A L.lO e Murray & Trene4, Inc.
  • 600 Fint Bank Drive, SuiteA .Palatine, llinois .60067 2 (847) 963-9000 101- 10/ r--,I

IL(L. (1.(1.I Annual Report: on the Meteorological Monitoring Program at the I Byron Nuclear Power Station*2012 I prepared for Exelon Nuclear I :Warrenville, IL 60555 I by Murray and Trettel, Incorporated 600 First: Bank Drive, Suite.A Palatine, IL 60067 (847) 963-9000 e-mail: mt@weathercommand.com For Exelon Use Only j Reviewed.By.:

  • '
  • o~~~Dte:..

!1.Murray & Treqe!, Inc. 600 Bank Drivle, SuwA Palaie, Illinois 60067: (847) 963-9000 i Table of Contents Section Description Page List of Tables. .. ....................................

1 Introduction

.................................

...............

" 2 Summary ...........

.. ... ..w...... ... ...... .... ............

...... ....... .. ...... 2 3 Data Acquisition.................................

.........3 4 Data Analysis ........................

......-..

.... ... .. ....... .5 5 Results .... ....................

....................

10..... ... ...... .... ............

00.Site Calibration logs .........

.....................

Appendix Murray & TrettA, Inc. 600 First Bank Dvrite, Suiw A Palatine, llfinSN 6W0067: (847) 963.9000 SListof Tables:.Number Description

.. PaQe I Instrument Locations

...........

.... ... ...........................

4 2 Data Loggers.......

.... .... ..........

.. ... ...................

4 3 Wind Direction Classes .................................

7 4 Wind Speed Classes ......................................

7 5 Atmospheric Stability Classes ...........

.................

8 6 Data Recovery Summary ...... ... ..................

11 7 Wind Rose, January-March 2012 ........................

14 81 Wind Rose, AprilJune 2012 ............

.. .... ...... 16 9 Wind Rose, July-September 2012 .........

.18.10 Wind Rose, October-December 2012.:., ................

20.11 W ind: Rose, January-December 2012 ........................

...............

22 12 Precipitation Totals .......................................

24 13 Maximum Doses Resulting From Airborne Releases ...............

25e Murray & Trettel, Inc. .6001First Bank DriveSite Af~ý.O Paatine, Illinois:

60067 (847) 963-9000

_1ýIntroduction.The purpose of the meteorological program being conducted at Byron Generating Station is to provide information sufficient to assess the local, weatherconditions and to determine the degree of atmospheric dispersion of airborne radioactive effluent from.the station.The meteorological tower is 250 ft. high and is instrumented at two levels. Wind.speed.

and direction are measured at 30.ft. and 250 f.. Ambient temperature is measured at 30 ft- Differential temperature, referenced to 30 ft., is measured at 250 ft. Dew point temperature is measured at 30 ft.. Precipitation:

is measured at approximately 3 ft.Joint frequency stability wind rose tables. of wind direction, wind speed,. and stability are routinely tabulated from hourly. measurements.

The quarterlyand annual tables are included in-this report.Descriptions of the instruments and digital recorder are given in Section 3 (Data 0 Acquisition) of this report. Data reduction and processing are described in Section 4 (Data Analysis).

The results given in .Section 5 Of this report include modeled maximum whole body doses, skin doses, organ.doses based upon airborne releases, and site meteorology., Murray &. Trectel, Inc. 600 First: Bank Dre, Suite. A Palaine,.l1inois 60067 (847).963-9000. -2. Summary The Byron Station meteorological monitoring program produced 52,554 hours0.00641 days <br />0.154 hours <br />9.160053e-4 weeks <br />2.10797e-4 months <br /> of valid* data out of a possible 52,704 parameter hours during 2012 (366: days x 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s/day x 6 measured priority parameters), which. represents an overall data, recovery.

rate .of 99.7%. Priority parameters are all parametersexcept dew point temperature and precipitation.

The stability wind rose tables included in. this report have been generated using: the 30 ft.wind data.with the 250-30 ft. differential temperature data..The maximum annual calculated cumulative doses resulting from.airborne releases.were as follows.Unit 1: gamma air dosel.beta air dose whole, body dose.: skin dose organ (child bone)4.360 x 104 mrad..3.070 x 10 mrradý8.261 x 100 mrem 1.650.x I0T3 mrem 4.057 x 10'- mrem Unit 2:.2.gamma:air dose...beta air dose.whole body dose skin dose organ (child bone)-. 5.870: x. i 0` mrad:-1,90.x10 5 mrad..9.440 x.1O.2 mrem 8.47G x 107 irarem* 4,565.x:1,0ý'

mrem Murray & Treual, Inc, 6L0 .First.Bank 1 Dive,...Suite A Palatine,.

illinois:

6006.7 (847)963,9000 3. Data Acquisition Wind speed and direction are measuredwith Climatronics F460 wind sensors. The wind speed sensors have a starting speed of 0.5 mph (0.22 mps), a range of 0 to 100 mph (0 to 44.7 mps)., and a system accuracy of.+/-1.0 mph at 100 mph (+/-0.45 mps.at 44.7 mps). The wind direction sensors have a threshold speed of 0.5 mph, (0,22 mps), a range of 0 to 5400, and a system accuracy of +!56'Ambient and differential.

temperatures are measured with the Climatronics 100093 system. Ambient temperature is measured within the range of -22 to 122 0 F (-30.0 to 45.00C) with an accuracy of +/-0.5 0 F (+0.30C).

Differential temperature is measured within the: range of -10.0 to I 0.0°F (-5.6 to 5.60C) with an accuracy of +/-+0.1 8°F (+/-0.1 0°C).. Dew point temperature is measured with the Climatronics 101197 system. Dew point.temperature is. measured with the range of -22 to 122 0 F (-30.0 to 45.0°C) with an accuracy of +/-2.7°F (1.5-C).Precipitation is measured.

with a Climatronics 100097-1:

tipping. bucket rain gauge and is measured ýin increments of one. one-hundredth of an inch with a system .accuracy .of.+/-0.01" (+/-0.25mm).

Instrument types and locations are summarized in Table 11.The meteorological data are collected and stored by a Campbell Scientific CR1000. Data Logger.: The Campbell Scientific CR1000 measures the analog voltages of the instruments and records the digital equivalent.

within the range of 0 to +5 volts. Data. are obtained from the Campbell Scientific CR1000 by a direct dial telephone hookup to an in.-house.computer system.As a backup.to the CR1000, data are also recorded with a Johnson Yokogawa Corp. digital recorder(JYC DA100 data acquisition unit). Data are sampled every 10 seconds.Data loggers. are summanzed in Table 2.Murray &. Tgtel, Inc. 600 First. Bank ri SuiteA PalatidieIiioisý.

.60067 (847)963.9000 Table I Instnument Locations Measurement Wind Speed Wind Direction Differential Temperature Wind Speed Wind Direction Ambient Temperature Dew Point Temperature Precipitation Sensor Type Climatronics 100075 F460: Climatronics 100076 F460 Climatronics:

100093 Climatronics 100075. F460 Climatronics 100076 F460 Climatronics 100093: Climatronics 1001197 Climatronics 100097-1, Location Tower Tower Tower.Tower'Tower: Tower Tower Ground Elevation.250 ft.250 ft.250 ft.30 ft.30 30 ft.30 ft.3 ft.Table .2 Data:Loggers Measurement Winds, Temperatures, and Precipitation Winds, Temperatures, and Precipitation sampling Frequency Locier Tve: Campbell Scientific CR1000 Johnson Yokogawa Corp. Digital Recorder (JYC DA100 and Contec IPC-PT/M300(PC)WOU) digital recorder 1 sec'.10 sec.Murray &, Tra.tel, Ince.! .6.00 First Bank D.ive, Si.ite.A .uinei, lois. 60067 (847) 963.900o 4;. Data Analysis The Byron data logger is routinely interrogated to obtain hourly average data. The data are then stored. in the meteorological data base and listings of. the data are generated.

The data listings are examined.by qualified personnel and any apparent problems are brought to the attention of the Project Manager or Meteorological Technicianmand the Instrument Maintenance staff.Hourly values of wind speed, wind direction, ambient temperature, differential temperature, dew point temperature, and precipitation are obtained through measurements taken at the, site. The standard deviation of wind direction (sigma) is derived. The. wind direction variation is described in terms of the standard deviation of the direction about the mean direction.

The CR1000 computesan hourly value of wind sigma by taking the Root-Mean-Square (RMS) of the four quarter-hour wind sigma.values., The quarter-hour wind sigma: values are calculated directly from the one second wind direction samples:during the 15 minute period.The data base' files are edited approximately oncea week. Missing data logger values are replaced with digital recorder values, when available.

Invalid data are deleted from the data base..When an hourly value is missing or invalid, the numeral 999 is entered into the .computer data file in the appropriate location..

When the wind direction changes substantially relative to its short term fluctuations, the numeral 888 can be entered into.the wind sigma location to indicate shifting winds,. When the wind blows with velocities near the sensing threshold of the instrument, -the numeral.777 can be.entered into the.wind.

direction, wind.speed, and wind .sigma locations to indicate light and variable winds,.Murray & Inc. 600 First Bank Drive, Suite A Palaehw, Ino.is. 60067 (847)

A professional meteorologist reviews the data, calibration findings, equipment maintenance reports, and other information and determines which data are valid. Only.the. valid data are retained.in

the data base.As a quality control measure, a monthly comparison is made of CR1000 and digital recorder data. An investigation is made into the reasons for any significant differences between the sets of values.Joint frequency stability wind rose tables of hourly data measured at the site are generated.

These tables indicate the prevailing wind direction,.wind speed, and stability classes measured.

during the period of observation as well as the joint frequencies of occurrence of the wind direction, wind speed;,and stability classes..

The values are also Used as input to the atmospheric transport and diffusion models. Wind .direction, wind speed, and stability classes are given in: Tables 3, 4, and 5.Murray &SfTrettI,.

Inc. .600 First 8=knL Drive, Suite A Palatine, Illinois 60 .067 (8471) .963-900 .0 Table 3 Wind Direction Classes, IF IF IF IF IF IF IF: IF IF IF IF.IF IF IF IF: IF 348.750. <1 ..250 <33750. <56.250. <7.8,750 <.101,250 <.123.750. <1461250 5 168.750 <191.250.:

<: 213.759 <236.250 <258.750: <281.250 <303.750 <326.250 <.WD. -c WD <WD <WD <: WD <.WD <.WD <: WD <WD <WD <WD <*WD.s.<WD <WD <WD <WD. <11.250 THEN Class is 33.750 THEN Class is 56.250 THEN Class is 78.750 THEN Class is 101.250 THEN. Class is 123.750 THEN Class is 146.250 THEN Class is 168.750 THEN Class is 191.250 THEN Class is: 213.750 THEN Class .is 236.25,0 THEN Class is 258.750 THEN Class is 281.250 THEN Class is 303.750 THEN Class is 3261.250 THEN. Class is 348.756 THEN Class is: N NNE NE.ENE E ESE SE SSE S SSW Sw WSW W WNW NW NNW Table 4 Wind Speed Classes e.IF 0.0 mph < WS < 0.5 mph THEN Class is IF 0.5 mph < WS < 3.5 mph THEN Class is IF 3.5 mph < WS s 7.5 mph THEN Class is IF 7.5 mph: < WS < 1.2.5 mph THEN Class is.IF 12.5 mph < WS _. 18.5 mph THEN Class .is IF 18.5 mph. < WS '._: 24.5 mph THEN Class is.IF 24.5 mph < WS THEN Class is 1 2 3 4 5 6 7 Murray & Trettei, .In~c. 600 First Bank Drive, Suite A Palatine, IýoyWis 60067 (847) 963.9000 Table 5 Atmospheric Stability Classes Differential Temperature Interval (in °Cih.0m) 6i)Differential Temperature Interval (in OF over the 250-30 ft. interval)

(2)Extremely Unstable Moderately Unstable Slightly Unstable Neutral Slightly Stable Moderately, Stable Extremely Stable-1.9 <-1.7 <.-1.5 <.-0.5 <4.0 <AT AT AT AT: AT.AT AT-1.9.-1.7-1.5.-0.5 1.5 4.0.-2.3 <-2.1 <-1.9 <.81.8 <4.8. <AT AT'AT AT AT AT-2.3-2.1-1.9-0.7 1:.8 4.8 from ANSI/ANS 2.5 ( ANSI/ANS 2.5 intervals scaled for instrument heights on the Byron meteorological tower M~rray. & TretrejtWn.:

600 First Banlc Drive,: Sitite A Paltne, Illinois:

'60067 (047).963.900 The following.

two programs were used to calculate-doses resulting:from radioactive releases: 1. XOQDOQ: Computer Program.for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations (NUREG/CR-291 9)..The program. is based on the theory that material released to the, atmosphere will be normally distributed (Gaussian) about-the plume centerline..

A straight-line.

trajectory.

is assumed between the point of release and all. receptors, The program implements the assumptions outlined in Section C of NRC Regulatory Guide 1.111. In evaluating:

routine releases from nuclear power plants, it primarily is designed to calculate annual relative effluent concentrations, X/Q values and annual*average relative deposition, D/Q values.Output from the XOQDOQ program is used as input to, the GASPAR program..2. GASPAR Ih: A. Code System for Evaluation of Radiological Impacts Due to the, Release of Radioactive Material to: the Atmosphere During NoTmal'. Operation of Light Water Reactors (NUREG-0597).

GASPAR is. a program written for the evaluation of'radiological impacts due to the release of, radioactive material to the atmosphere during normal operation of reactors.

The GASPAR code implements the radiological.

impact models of NRC Regulatory Guide 1..109, Revision 1, for atmospheric releases.

The program is used to estimate the maximum individual doses at.selected locations in the vicinity of the plant.Murray & Tri-ttl, Inc. 600 FiRst Bank Drive,,Suit A Palatine, Wllinois 60067 (847),963.9000 A-10-5. Results 5.1 Instrument Maintenance The maintenance program followed"during.2012 was composed of routinely scheduled visits and equipment repairs. Routine site visits were made to inspect the sensing and recording systems for proper operation.

In addition, routine maintenance and calibration checks of all tower-mounted and ground level equipment were performed every four months. A description of the calibration and.field procedures is found in the: Murray an.d Trettel., Inc.. "P1 009 Procedures Manual'(July 2010).In February, the RH sensor was replaced due'to high readings.I In March, computer channels Y4000-Y4006 were out in theý control room. The problem was traced to the transient eliminator on the east wall of the shelter.In April, surge protection in the shelter was damaged, affecting control room signals I. and phonelline communication.

The damage was repaired to restore proper operation.

In May, the annual tower inspection was performed.

Also in May, a spare digital recorder was installed due to a display failure.In August, the pivots on the tipping bucket in the rain gauge were lubricated.

In September, atthe request of the site, system response checks were performed on process computer channels Y4000-4006 and: Y4011-40,19., j In. October, the 250 ft. wind direction was replaced due to bad readings.In: December, the :250 ft. wind speed was frozen for four hours.No other significant problems were encountered with the equipment, and at the end of the year, .no problems were evident at the site.Inc... 600 First Bank Drive, SuittA. Palatinellfinois" 60067 (847) 963-9000 .5.2 Data Recovery The. record of data recovery for the year is summarized in Table 6.Table 6 Byron Site Data Recovery Summary 2012 0 Measurement Wind Speed Wind. Speed.Wind Direction:

Wind Direction Ambient Temperature, Differential Temperature Dew Point Temperature Precipitation Elevation 30 ft.250 ft.30. ft.250 ft..30 ft.250-30 ft.30 ft.3 .ft.Recovered Hours 8771 8767 8771 8726.8771 8748 8770 8764 Recovered Percent 99.9 99.8 99.9 99.3 99.9: 99.6 99.8.99.8 Lost Hours 13 17 1.3 58 36 14 20 Percent: Changed 0.7 0.3.1,.1*1.0 0.2 0.6 6.5 0.5 AVERAGE*99.7* average of priority parameters (all except dew point temperature and. precipitation)

Valid Hours Lower Level Joint Frequency/

% 8748: Uppet Level Joint Frequency, % 8699 Recovered Percent 99.6 99;0 Lost Hours" 36 85 SMurray& ~Trettel, fnc, .600 First B&.m D e, Suite A Palatine, O6007 (.47) 963-9000

-.12-.5"3 Summary of Billings for Equipment Repairs, Replacement Parts. and Other Work not Included in Fixed-Cost Maintenance Agreement

-2012 Description

.- Byron Cost: January Meteorological equipment maintenance

$ 180.00 Meteorological parts, materials, .and contractor services 793.01 Special Request 85.00 February.Meteorological equipment maintenance 347.80 Meteorological parts, materials, and contractor services 667.23 March Meteorological parts, materials, and contractor services 35.59:,1 Meteorological*

equipment maintenance 1,182.20 Meteorological parts, materials, and contractor services 467.00.Meteorological.equipment maintenance" 559.60 Meteorological parts,. materials, and contractor services:

2,966.56 Special.Request

382.50 June Meteorological parts, materials, and contractor services'.

194.66 Special Request 85.00 July Meteorological parts, materials, and contractor services 166.96 Meteorological equipment maintenance 0.00 September Meteorological equipment maintenance 497.80..October Meteorological equipment maintenance 770.30 Meteorological parts, materials, and contractor services 52.82 November Meteorological equipment maintenance.

'90.0.0 Meteorological parts, materials, and contractor services:

703.02.December O Meteorological equipment maintenance 1.20.00.AnnualiTotal:

$ 109347.05 Murray .&"Tread,..Inc.. " .600 tirst Bank Drive. Suite Aý P1daline, 1lliis. 60067 (847) 963-9000 5.4 Stability Wind Rose Data.The quarterly and annual stability wind roses are given in Tables. 7 through 11. Wind speed classes have been altered to reflect.the sensor threshold...

For the year, winds measured at 30 ft. most frequently came from the. south (10.52%)and fell into the 3.6-7.5 mph and 71.6-12.5 mph wind speed classes (36.99%- and *34,44%respectively).

Calms (wind speeds at or below the sensor threshold) were measured 0.10% of the time. Speeds greater than 24.5 mph were measured 0.24% of the: time.: Stability.Obased on the 250-30 ft. differential temperature most. frequently fell. into the neutral.classification (44.56%).Murray & Trecca, Inc. 600.First aik Drive,. Suitz A PaLatne, 60067 (847) 963-9000 TABLE 7-14-Byron (;eferatin:g Steif on 30 ft. Wind peed arn1 0 irection.J~~ar.9ach.2012.

^50.t-KRF W~ta4T (F)fltiter&~

ervaton ~.2159: Values a~ hPenCP. Occwvece SPEED ..CLASS' N SEU. G.00.cSu. 000 A NS.. 00 0 LS.S 0.00 MS 0.00............-.-------

WIND DIRECTION CWASsES ------- .....................

NNE NE ENE E ESE SE SSE S. SSW SW WSW* W WN NO t Rw N TOTAL...*----,SABILITY CLASSES.-----..

EU MU SU .N ss MS ES TYAL 00 G0.0 0.00 0,00.0.00 0.00: 0.00 0.0 0 00.0..00: 0.00 0.00 0.09 0.14 0.00 0.00 0.00 0:00 0.00 0.00 0.00 0.00.0.00.0.00 0.00 0.09 0 0.05 0.009 10.00 0.00.0. 00 0.00 0.00 0.00 0.00o 0. 00.0.00.0.00 0105..0.05 0.09 O.00 0.00 0.00 0.. 00 0.00 0.00 01;00 0.00 0..00 0.00 0.. 00 0.23'0.19 0.09 0..09 0.00 0.00 0,00 0:.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.14 0,09: 0.00.0.00 0.00 0.00 0.00 1.o0 0.00 0.00 0,00 0.00-0.09 0.19 0.191 0.:09.0,0.0,00 0.00 0.00 0. 00ý0,00 0.00 0. 00.0.00.0.005 0.05 0:05 01,05: EU: MU SUl N SS KS ES 0 00 0.00 0.00*0.00 01.05 0.0$0,00 0,00 0,00.0.00 0.00 0.00 0.00 0,00 0.00'0. 0 0.00 0.23 0.14.0.0.51 0.00 0100: 0,00 0.42 0.79 0.74 0.32 0,00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0,00: 0., 28 0.09, 0.14 0.00.0 00 0.65 0.65 0.51 0.00.0,00.O. 0 0.00.0.00 0,00 0.00.0.00.0.00 0:19 0.42 0.14 0.05.0.00.0..00 0.00 0.69 1.30 0.19 0.00.0.00 i0 ~00.0,00 0.00 M.O 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.09 0,09 0.05 0.00 0.00 0,00 0,00 0.00 0.00 0.00 0.00 0.00*0,.00 0.28 0,42.0.09.0;00: 0,00-0.00 6.00 0.00 0.00 0.00 0.00 0.00 0.O0 0,00 0.05 0:23 0.05.0,00 a 00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0 00 0.05.0.46 0.37 0.09.0.00::0.00..0;00".0! .97.0.:19 0. 005..0.00 0. .00 0..00.0.00 0.00 0,00 0.00 0.00 0.00 0.05 0.19 0.05 0,19 0.05 0.00.1.02 0.05 0.00 0.00 0 00 0.00 0.00 0..14 0.00 0.00 0.00 0.00 1.48 3.1 .5 1.6.7 0.93 0.05. 0.05: 0. 05 0.14 11.90'10.61 0.93.0. 00: 0.00: 0.00 0.14 0.000..0 0.:00 0.00 a:0., 0.00 1.48:3:15 1..67 0.93 7.23.1,000 0,0 000 00 4 SU MO 6;14 7 SS 0.32 0.19 BS 0.14 0.09 IEsl 000. o000 0.00 0.00 1.667 0.05 0.00 t.00 0.00 0.00 0.00 0.65 0.00 0.00*0.00.0.00 0.001 0,00: 0.56: 0.09.0.05.0.00 0.05.0.97 0..14.0.00 0.00 0.00 0.'a00 G0.00 0.65 0, 14 0.o0"0.0 0.00.0':00.0: 88.0:32 0:00 0.05 0.05 0.09 0.93 0.281 0.00 0.00 0.00 0.00 0.00 0.97 0.56 0.14 0,05 0.600 0.00 0.14 1.11 O.23.0.00 0.00 0.00 0.00 0.00 0.28.0.56&0.37: A.09..0.00 0.09 0.56!0.28 0.19 0109-0,00 0.00 0.00.: 0.46: 0..69 01.65.0.19 o. o~d 0.00 0.00 0,74 034 0.39 0.09 0,00 0.o00 0.00 0.51 0.60 0.4 0, o.0.00.0.00 1.71 0.32 0.14 0.00: 0.00 .0.Q100: 1.07 A:oo m.4 0,00, 0.00.0.00 0,00 0.79 0.46.0..09 0.00 0.00 0,00 0.00 1'.76 1.20.0.00.0.00 0 00.000 2.27 1.95.0'23.0.05 0:00 0.00 0.05 L125 0.69 0.19:0.00 0.00 0.00 o, 05 1 34 0.93 0.00.0,o00* IMO 0.05 0.00;:0.05 0.00 0.00 0.93 1.02.o 00*0.0 0.00 0.00 1. 99 1.95 0.00 0 00 0.00 1.00 2.ý 22-0.42 0.00.0A00 0.00 0.05: 0.00o 1.34 1.39.0.00 0,00..27.47 0.05 0,14: 11.90 10.61 3,80: 0.93 0.00 0.o00 0.00: 3.15 0.02 0.00 0.00 1~.05 0.23 2.43.0.0T 0.00 1:600:: 0.,00..0.00 0.05 2.22 0.37 0.00:0:00 0.00 0.000.0.37.2.18 0.00 60.0 0 00 0.00 0.O0* o4 0,14 1,07 0.13: 0.00 0.:00: 10.00 0.0,0 0.00: 0.00 0. d~b 0,00. o.o 0.74 23.39, 12.738 1.30 0.o37 0.00 0.00 0.05!0.,97.14.54 5.51 0.00 A,0,.00 0.05 0.74.,.23.39 12.78 1.30 0.31.38.63 0.O0 0.00 0.0 .0....00.0.00 0..00.0.23 0.05 0,00 0.00 0.00 0.,00 0.o 0i001 0.00 0.00 0A. 00 9.00'o.00O 0;.00 0.00 0,00 0..00.0.0%5 0,06 0GI0 0,00 0.00 0,00.0o 0.05 0.09 0.93: 0.42 0.60 0.00 0,00.0AO.00 0d.0 0.00 0,00 0,00 0.00 0.14 0.14:1,71 0,88 1:30 0.69 S0.0 0.00 0,00 0.00 0.00 0'.00 0.00 0.23 0.00 0.00 0:S0 0.97 14.54 5.51.0.00 21.07 Murray &"Trettel, hic. 600 First Bank rtN.e, Suite A. Pahatine, Illinois 60067 (847) 96349000-TABLE 7 continued,-1.5-9yiNon Gerliterd'n S~atmn 30 it:, W~ind Speed anld Dfrect1Ofl January-44rch, '2012'250Ft-*30Et.

Velta'-r F CLASS iNE wll, U. V'trrfnm a ms ----s 'STABILITY CLASSES'j

9 EU mu S U Ni SS S E NE ENE E ESE SE SSE*S SSW SW ldSW' w WIei' N'W _NNWj1 TOTAL 0.O.0.0,00 G.000 0.09 0.00 0.00 0 00 0.00 0.00 0 00: 0.00 0.00 0.00 0.00 0.00 0.00 0 .00 0.00 0.00;0.00 0.00.0.00.0.00.0,00 0.00 0.00 0.00.o, 00.0. 0 0.00.0.00 0.00 0.00 0.00 0,00.0.00 0.00 0.00 0.00 0. 00 0.00.0.00 0,00 0.00 0.00 0.00 0. 00 0.00 0.00 0.00 6:00 0.00;0 o00'0.00'0:00 0.00.0.00 0.00 0.00 0,00 0.00 0,00 0.00 0.00 Mo0 0o0 0,00 0.0o0 0.00 0.00 0. 05 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.o0 0.00.0.0 0.00 0,00 0,00.0.00 0.. a0d 0.00 0.00 0.00 0.00 0.00 0;.00.0,00'0.- 00.;.0:32 0!.14 0. 00 0.00.0.00 0.09.0..37 0 .00:0.00 0 0 0 mo~o 0,00.0.69 0. em 0.00 0,0O.0.00 0.00..0.00 0,.00 0.00.0 0-0.00 0. 09 0.28.O' 00 0,00 0.00 0. 00 0.00 0.00 0.00 0,00 o.00 0.00ý0.00 0,32%0.00 0,00 0 00 0.00 0. 14.0,00 0.00 0.00 0,00 0.80 o,g .0.9co 0.00: 0.00 0 00 0.00 0'. 08 0.00 0.05 0.00 0.00 0O.'00 0,o00 0. oo a0 .00 0.83: 0.A0 0,00 0.00 0,00 0.00 0.00 0.09 0.00 0.00 0,00 0,00 0.00 0.05 0.19 0.00 0.00 0.00 0.00 0.00, 0.00: 0.00 0.00: 0.00'0.00 0,00.0. 00 0.00.0.00.0.00 0.00 0,00 0.00 0.b00.0.00 0,0o 0.00 0.00 0 37.4.08 0. 46 0.00 0.0 0.00 0.00 0.00: 0.42 0.00 0.00 0,00o 0,00 0 37 4.08 0.46 00o0 0.00..4.91 EU.T SU N'2 S 4 MS ES 0.00 0.00 0.00 G.00 0.00: 0.00.0.o0 0.00 0,00 0,00.0.05 0.00 0.00 6,00.0.00 0..00 0.42 0.08 0.00 0.00 TOT 3.38 2.13 2.83 2.96. 3.84 .3.57 6.07: 9.59 11.02 718 .6.44 6.53: 10.51 10.70 8.48 4.49 99.86 0.05 0.14 2:22 55.81 32.52 6.76 2.36 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S. SSW: SW *4 W WW NW NNW TOTAL 0:00 0.00 0.00 2.78 0. 37 0.19:: 0.05 0.00 0.00 0.14 1.57 0.32 0.09 0.00 0,.00.0.00 0.05 2.18 0.46 0.09 0W05.0.00 0.05 0.09 2.04 0.65 0.09 0.05 0.00.0.00'0.14 2. 32, 1.02 0.23 0:14'0.,00 0.00 0.w09ý1.07 1.:44:: 0.69.0.28 0.00 0.05 2 22 2.22 1.20 0.37 0.00 01.00 3-.52 4.77 0.97 0.32.0100: 0.32'.4.82'.4135 1.11.0 .:42.'.*0.00.0.00 01.19 3.61 2.45 0,179 0,14.0.00 0.00 0.19 3.01 2,87 0.32 0.05 0.00 0.00 0.00.4.31 1.99 0.19 0.05: 0.00 0.00 0.14.6.44 3.84 0.09 0.J00 0.00: 0.09.0.23 7,60: 2.73 0.05: '0.00 0.90 0.00 0.46.5:60 1.71 0:56 0.14 0.05 0.00.0.14 2.73 1.30 0.09 0.19 0.05'0.14 2.22, 55.81.32..52.6.7 6 2.36:-STABILITY CLASSES-Extremely Unstable Moderately unstable Slightly Unstable.Neutral Slightly Stable Moderately Stable Extremely.Stable:

Aind Dtrectiod by Wind Soeed Nd NNE NE ENE: E ESE SE SSE .S SSW SW. AW W NW NNW TOTAL 0.00 0...09 1.25 1,71 0:23 0.00 0.00 0,23.1.20:0.650.00 0.o0 0.00ý0.14 0,74 1.16 0.79 0,00 0,00 0.00 0. 1 1.25 1.34: 0.19 0,00 0.00 0,00.0'60:.1.71 1.48 0.05 0Q.00 0.60 0.,00 0.51 1.30 1.'26 0. 51: 0:05 0 0o 0,00 0,56.1.99 1.95 1.57 MO0 0.00.0,00 0.19;1.62..91 2,41..0..46 O,00 0 00 0 42 4.69 3:15 0,56 0.05 0.00 0.56 1 .81: 2,18 0.83 0.09'0..00 2.32:0:,79 0.370 0,00 0.00 0,42: '1,34 1.34 0.032 0.14 0.00 0.79 1.,95 3.94 2.64 1.16 0.05 0.00: 0:32 2. 78.'4'.17 0.03 0%.09.0,00 0.97 2.08 2.64".55 0.00.q,000 0.46.1,99'1 44,"0.60 0 00'0 0'.00 0:14 1.23.27.47ý38.63 21.07 4.91 0.42-WIND SPEED CLASSES-CAL M3,.5 sph 3.6. 75 mh 7.6. -12.5 ITh 12.6:: 18,5 VrS rVh>ý.24;5 wh Murray & Trettel, Inc.: 600. First Bank. Drive, Suite A Palatine, Illinois &V067 (847) 963-9000 TABLE 8-!6-Byron Gteneratlng Stat ion 3,1 ft. Wind. Spcel ed ~Diet April-June.

2012 2-50Rýt30ft Deita.T F,%Naler of abstrnatiaons

-2179 Values 'ie Percent C~durrenc.

SPEED -------- ---- ,---- WIND DIRECT'ON CLASSES ---------------

---CLASS N.NNE NE EAE E :ESE SE SSE S SSW SW ,6SW W Wred NW NrW TOTAL EU EU Lss Eu/.C SU AN 3 SS..ES 0.00 01.00.0.00 0,00 0.00 0.00 0.00 0.O00 0.00 0.09 0.14 0.18 0. 09;0.00 0.*o00 0.00 0,00 oO0O 0.00 0.00 0.00 0.00 0.00 0.00 0,05 0,091 0.50.-0.ý73-0.O9 0.00~00.00 N 0ý92 7 SS 0.60 MS 0.09 SES 0.05 0.00 GAO0 0.00 0,00 0.100 0.00 0,08 0.00 0.00 0.00 0,00.0.28 0.09 0.00.0.00 0018 0.255 0.09"0.00..0. 32 0.169 01.56 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00.* 0,00*0.00.0.00.0.28.0.14 0:05: 0.09;0.09: 0 .14 0.46 0.14:.0.00 0.05.2.39 0.73 0.05 0,00 0.05 0.05.0.00.o0 .00 0.00 0,00-0.00 0,00 0.00 0,00 0.00 0.00 0 .00"0.05 0.73 0:14 0.00;0.280 1.42 1.93 1..06 0.05 0.00 0.00 0,2,8 2.z94: 0.50: 0 000..00: 0 .00: 0.09 0.00l 0.00 0 00.oo,00*0.00 0.00 0.00 0.o00 0.00 0.0 00 0.00 0.00 0,00 0.00 0 ..14 0.00 0.00 0.00 0.00: 0. 46.0.69-0. 18::0 00 0.00 0..00.0.870.664 O.ý0.09.oloo 0.05" 0.73 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0 00 0.05 0,09*0.05.0.00.0,00 3.00 Mo.o 0,00.0,00.0. 00 0,00 0.00*000 0.00 0.00 0.00 0.00 0,09 0.09 0.18 0.18 0.18.09O. 0.3 01.00 a1, do 0.a00 0.00 0.00 0.00 0-.o00-0.00.

0.00. 0.00 0.00 0.05 0.64C 0.50 0.60 0,13.1.01. 0.87 0.23. 0,14 0.09 0.32 0:46 0.87 1.06 2.11.0.41 1.70 0.05 0.05 IEU 8e SS EMS.0. 00: 0.05 0.00, 0.18 1. 65. .0.69 0.32: 0.50 0 05 0.00.0.00 0,06 06 .05 0.1. 4 0.0o0 0.00.0,09 0.05 0.78 0.18 0.00 0.00: 0..00 0d,00 0.00 0.00 0.00 0.0.0 0..41 0.41'1.01: 0.09: 0.09.0.ls 0.;46 0.96 1'.38 0.00.0.00 0. 32 1...06: 0.00 OA0.0. 0o 0.00*.0.0.o0 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.05 0. 14 0.00 0.05.0.83.0. 98 0.09 0.30.0.14 0.352.0.96* 0,00 0.00 0.00: 0.00 0. 00.0 CO 0.00.ý0,00 0.00 ,0.00 0.00.0.00 0,.09.0:37.0.37 0.1 4.0ý 00 0,00: 0.05 1.01 0.169 0.09 0.00.OM 0.28 0.14 1.38 0.09 0 :oo: 0.00 0.05 0.05 0.55.0.00 0.00 0.00.0,00.0.00 0 .o0 0.00 0..00 0.00:0..00*0.00 0.0o 0. 14 0.28 0.55 0,28 0.00 0.00 0.64, 0..14: 0.00 0. 14'0,0o,.0.055 0.60.0,14.0.009.0. 09'0.09 &.0.32 0.09 0.00.0:00.0.00d 0.00..: 00R 0.o00 0.00 0.00 0,00 d .00.0.00 o.00 0.00 00 0.00 0.00.0.00 0.00 0. 14 0.09 0.46. 0.i4 0,55. 0;37 0*.18, 0.18 oA..0o:.0..do

  • 0:00:0.00 0.09 0.00 0.87 0.55 0.60.96.0.37 .0.09.0.00 0,00 0,05. 0.00 0:o.s 6.09 02 ,28 0.69 1.15.0.32 0.46.0.00 0.00 0.00 0.00 0.14 0.00 0,05 0.05 0.09 0.18.0.37 0.41: o.00 0.00 0.00 .0 0.00 8.00 0..00 0.00 0:00 0,00 0.00 0a09.0:28 0.23 0.55 0.00 0.09 0. 78: 0..23 0.05 0.28.0,144.0.64: 0.37 0.00%0,00'0: 23 0.23 0. to om:ovo 0 64. G 0.00 0.00: 0.00 0.00 0000 0.00 0.00 0.00 0.00 0.60 0.00 0 05:OAI 0,028 0.009 0..00 0.00 0."14.:0.92.0.64 0 ,05.0.09 0,00 0.23 1..51.0.28 0.00 0.00 0.00 0.00 0.00;0.o00 0.00o 0.00 0.0 0.09 0.00: 0.00.0.09.0.A0 0,0 0,00 0.00 344 3,53 2.,29 0.14 0.14 0,14: 1.42 11. 75 11.43 6.93 0.92 1.06 1.06.1,.56 3,63: 19,69, 10.56.2...280.0.23 1: 1..06 2.01 7.57 1.74.o.o 0.00 3.53.2.29........ STABII.[TY CLASSES........

m.U .SU. N ,SS: MS E.S TOTAL o0o.0.000 0.00 0.00 0 09 0A00 0.00 0.14 1. 42.11.75.11.4I3 6.93 0 92 32.72 1.51 3M44 I. 566 3.63: 1*9.69 10M56 2.80 0.23 0,00 0. 05 0.*09 0.00 o.00 0,00 0;.64.1-18 o .oblm., (ioo::: 1.65 2.,07 7,57.., ,?4 0,00 0...O Murray &. Treue, Inc. 600 Firsi Bank Drive, Suie.A PalaUine, Illinois 60067: (847) 963.9000 TOABLE 8 continued Byron Gen~raitwq~:

Stat Ion 30 ft. W~nd Speed and biewofn SPEE" aIN 3!ROON LSE-17-CLSS N Aprvi)ine, 2012 25.0Fti31F.L Oitad. STABRI3TY CLASSES ----.-----

NW NM4A TOTAL EU. MU SU N SS s. E5S 0.00 0.00 0.18 0:18 0.00 0.00 G.28 0,28 NNE N~E ENE E ESE SE SSE Sý SSW SW WSW. W w.N'A EU 1 Mu 9 SU wN.g: SS: 4 MS CS 0.00 0.00..0.00 a.0.00 al oil 0.00 0,00 0.00 0.00 0.00 0.00 0.00: 0.00 0.00:0,00 0.00 D.00 0,00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0,00 0,00 0.00 0,00 0 00 0.00 0.00.0,.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0A00 .00 0100 0.00 0.00:. 0.00 000o 0.00 0.00 .00.0 00 .0o 0M00 0.00 0.00 .0,00 0.00 0*M 0.00 0.00 0.00 0.00 0 00 0.00.0.00 0.00 0.00 0,00: 0.60.0.05 3.00 0.,00 0.00 0A0 0.00 0o00 0.00 0,00 0,00 0.00 0 :00 0,00 0.00.0.00 0.00 0.00 0.00 0,0o.0.00 0,00.0.00.0.00 0.0d 0,00 o 05 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00'60.09 0.0C5S 0.1.8 0.0.o 0 0.00.0.05 0. 05 0.05 0.1.4 0.00 0,00 0.00 0.00 0.00. OA.0.28 0.09 0-.23 0 00o 0.00 0.o0 0,00 0.00 0,00 0.00" 0.00 0. 00.0.00 0.00 0.00 0.00 0.00~ 0,00~0..00 0.00 0.00 0.00 0,00.0:00 0,00 0.00 0:00 0.00 0.00 0.05 0,00.0.00 0.00 0.18 0.00 0.0106 0. 14ýC.,00 0.00 0.00 0.00 d0.0 0.05 0,18 0.00 0,00 0.00 0,00 0,05 0.09 0,00 0.00 0.o00 0.00 0l 00 0,00 0.00 0.00 0.00 0.00 o0.0 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.80 0.00 a0.00 0.00.0.00.1 0.00 0.00 0.28 0.92 0132.0.00 0.00 0.05 0.05 0.05 0,09 0.37 0.00.0.00 0.00 0.28 0.92 0.32 0. 00 0,00: 0.05..0,09 0,37 C000, 0.00 0.00 TOT 5.51 4.04 5.19 .6.15 .9.45 5,19, 5.00 8.95 8.44 '936 5.55 4.45 6 20. 5.28 6A.0 4.77 99.8i 2.48: 367 7.48 41."900.2?,49 13,26' 3.53 Wind Direction by Stability 99.82 N NNE NE. -ENE E ESE SE SSE S SSW SW WSW W WlNW NW NNW TOTAL 0.05 0.00 3.44 1.06.0,32 0.14 0.23 0,23 0,50.1.42 1.42 0.23 0.00. 0.37 0.50.2.89 1.10 0?23 0.09 0.14 0.46 3.72 1.38.0.18 0;09 0.600 0.,00 0.55 4.50 3.17 1-. 19" 0.05 0.00: 2.16%1.24*1. 33 0.00.0./14 0.14 1.24 1.74 1.41 0.05 0!23 0.46 2,V.0 3,17: 2..75 0.37 0,64 0.73: 2185:2..314 1.1.9 0.64 0.55 1, 10.3.58 2.29 0.92 0.09 0.37 0.23 3.,12..1.15.0.46 0.09: 0.32 0.41 1.84 0.83 0.69 0.37 0.09 0.50 2.39 1.74 0C92 018 0.00 0.28 0.50.2.29 1.; 56: 0-46 0.18 0.37: 0.28, 0.46.1.74.2ý20 0.46.:0.60.0,09 0.00 0.37 2.62 1.10 0.46 11, M..2,48 3.67 7".,48 41.90.27.49-13.26 3.53:-STABILITY CLASSES.Extreweiy .unstable.

unstable Slightly Unstable Neutral Slight ly.Stable Moderately Stable Extre-ely:Stable 0.41 0.28 .:0.28 032: 0.28 0114 0.28 Wind Direction by. Wind Speed N NNE NE ENE E ESE. SE SSE S SSW. SW WSW W Wd: NW N.NW TOTAL 0.00 0.50 1.84 0. 92.0.00 0,00 0.00*0.37 1.151 0..37 0A00 0.00 0.00 0.55 0.83 1.33'0.00 0.00 0.00. I. .74'348 0,32.O.00 0.00: 0,00 0.92 4,73 3,72 0.09 0.00 0.000,18 1.65 2.39 0.92 0.05 0.0,O: 0.00.0,18 2.48 2.20 0.14 0,00.30 0.00 0.37 2.29.5.09: 1.15: 0,05.0.00 0 CO 0.69 1.93 a,07 0.37..0.28 0.00 0.,46 1.97"ý3.07 3.17.0.69.O00..0"00: 0.96 1,84 1,.97 0.M4 0,14 0.00: 0.00 Lv24 0.92.0A7 0,09 0.05 0,00. 0.00 1.33: .0.178.2.29 1 .61 I..38 1,97 0.64 0.64 0,32 0.8.0,23 000 0,00 1.15 2.7.1.1.51 0,73.0.00 0A0 0.00 0,60, 1,93 211 0,14 0.00.0.00 0.18 10. 78 32.72 39.5 1 14.0q 1.97 0.55-IND SPEED CLASSES-C.A L M.* 3.5 aph 7,6 -2,5 rimii 12,6- 18.5. aphi 18,6 *24,5 ph> 24.5, ih Murray..&Trewt., Inc. 600 First Bak Drite, Suite A. Palatine, llinois 60067 (847) 963-9000 TABLE 9.!48-.Byron Generat~ng Station.30. ft. wind soeed an b 0rectiom J~iy.~e~tn02r.

2012 Numblerof Obs0~vk ilris. -21P6 VXahie amrepercent Occurreice sPEEo ..........................

.WIND

.-. ..........

.................

STAB1LITf Y CASSES .........CLASS: N NNE NE ENE E ESE SE SSE S: SSW. SQJ WSW W. WNW Md NNW TOTAL.EU m. Su .N. SS t4S ES. TOTAL EU.C.u.A N*L SS ES 0".00 0.00 0 00 0.00 0,.00 0.00 0.00 O.OQ 0.00 0.09 0.23, 0.4 0.18 0.00:0.00 0.00 0. 00, 0.00.0.00.0.00 0..oo 0..005.0,00.0.00.0.14: 0.32 0.14 0.09* 0 .00 0,00 l0 00 0.00 0.00.0.0a: 0.00 G.00 0.00 0O00 0.00 0.00 0.00 0.00.0o0 0,00 0.00 omo o.00 0.00 0.oo0 0,010 0.00 0.00.0,28 0.28 0.51 0.37 06.00 0.00 0.00:.0.00 0;00 MO'O 0.10 0.00 0w00 0.14 0.28 0.23: 0.14 0.lL00 o. 0.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00.0.00.0.23 0.32: 0.14 0.18 0.00 0.00 0.00 0.00.0.00 G..00 0.00%O'.Q.00 a.-GO 0,28.0.23 l0.41 0.46 0.00 0.00 0 00 0.00 0.00 0.00 0.00 0.00 G.O00 0.00 0.00.0.23 0..92 1:33 0. 10 0.00 0.00 0.00.0. oo 0.00 0.00 0.00 0,09 0.41 1,15. 0.00: 0.00 0.00.Oooý0:00 0.00 0 00o 0,00'LOO 0,00 0.00 0.00 0.00 0.00 o .*oo 0.00 0.00 0.00 0.00 0, 06" 0,00 0.00l 0.00 0.37 06.41 0.55 0.00 0.00 0.00 0.00 0.00 01 0.0.00 0,00 0.00 0.00 o.oo 0.00 EU I M 1. SU-N Eiss 0.00 0.00 0.00. 0.00.0.0-0 0.05 0,14 0.32 0.18, 0.14 0.09, 0.09" 0.05. 0.09: 0.00: mo,5 0.00 0.05 0137 0.46 0.00 0.00 0l00 0.18 0,46 0o.-00 0,00 0.00 0.00 000:0 Cc00 0,37 0.18 6 .: 0.55.0.87 0,ý83 0t. 74, 1.70, 0.,00 0.00 0.00 0.00 6,o0 0,.00, 0.00..0. 00 0 00 0.05.0.18 0. 55 0.00 0.14 1 19 0.78 0.18 0;23 0.14 0.05 0.18 0,78 0.28 0.00 c. 00 (0I.G00 mo.0 0.60 0.00: 0.00 00 .0 .00 0.00 0.09 2.90 5.24 915.7.95.0.74 1.42 2.71 1.7;19.13-119.9.88.4; 00 0,0:0 0.09 0.00 0,00 0.09 0.00 0.00 0.00 0.09 2.90 15.24 9.l 5l 7.95.25.32 05. 0.0.9 1 .09- 0ý28 I 4 SU 0 05 0,14 h 1.01 i,24 7 SS. 0.92 0.ý74 MS .0 23 0.23 " ES: 0.09 0.00.0.0G9'0.05;.0.51 0. 55.0.14'.0.I00 0.09 0.05 0.00 0.83 0.18 0.00.ED MU 8 SU-N 2 MS ES O.16 0.14 0:14 0.28 1.65 0.23, 0,00.0..00 0.01.0.74, 0.14 0e.0 0OO0 0.00:0.60 0.78 0.32 0.05 0.23 0:, 0.05 0.,69 0.69 0.00 mo 0 0.00 0.00 0'm0 6.0,0 0.00.0.900 0.05.1.10.0.92..0,87: 0. 9 0.00 0.00 OQ: 90l 0,09 0.09 0 0 00l 009.0.09 0.37.0.60.0.60 0,00.0.00 0.00 M,9 0-00 0.. 00 0.00 0.00.MOlO.0.64 0.51 1.01 0.55 0.00;0,05 0.00 0.05 0.00 lOlVOOll mo~0.0.0 0 00 0.00 0o.00.0 000 0.00 0.09.I.,oC6: 2.21 0.92: 0.00 0.123.0.23.0.09.0 178 ý: 0.05 O .. 00 0.00 0.00 0.00 0.00 0.00 0.0o!0.28 01.92 0.83 2:25.0,74 6,09 0.18.0.74 0.37 0,00 q0.00.0.00 MO 0 0.05 0.00 6"'00: 606,0 0,00;10.32 1.10 0. 83 0,87 0.09 0. h4 0. 23l 0.28 0,51 0.:92 0.00 0m0a 0.00 0.05 0. 18 1.75 1.38 0,46.0.0.5 0.37 0.14.0.00 0. 00 0.23: 0.18 o.41 2.21, 1..01 0.09.0.41 0.37.0.64 0.69 0.09 0.05 0, 00 0.14 0.09 0,23. 0.118 0,37 0.28 1.65 10'1 0.60 0.,6 4;0A.18 0.05..0.00 .0.00: 0.18 :0.23'0.28. 0.14 0.09 0.23 0 .64 0.28 0.23. _0. 00, 0,00 .0.00 0.00. 0 .00: 0.05 6:. 18-0,28 8.92ý1.29*0.18g 0.00 0.51 0.18 0,18 1.15.0.09 0 00 0.00.o'co 0.05 0.18 0'.05 0.00 0G00 9.88 40oo 49,13.1.42 2.71 17.19, 13.19: '.317 3.17 2.34 2.67 9.47 3.77 1,33 0,09 0.5s5 -a-0.55..0.23 0.18 0.:92: 0.37 OoO0.2134.2.67 9.47.3.77 1.33 0 "09: 122.84 0.0. 0,00.0a.00 0.00 0.05m: 0.00 0.46 0.05 0.05 0.05 0.00 0.00 0.00 0.600 0.00 0.00 0.05.0.o.00 0.00.0.00 0,00, 0.00 0;g.o 6.00 0.00.0 l 00 0'.00 0.00-0.:00'ý0. 00-~:0 00 a11 2.l 0.00 U- 00" 0,00'ý0.14 0.09 0.05 0.14 0 :05 0.00 0,00 oGoo 0,00 0.m :00 0.00 0.00 0.00 o .18 0l 00.0.050. 00 0 0 oso0 0.00 0.00 0.00 0.00 0.00ýP -, 0..0.00 0.00 0.00;0,00: 0.00ý0.00 0.23: 0.18.0.92 0.37 0.00 0:00 2.125.Murray & Trettel, Inc., 600. First Bank Drive, Stite A l'l iis 60067 (847) 963-9000 TABLE 9 continued-19-Byron (cnerat Ing Swi ion 1.3ft iird Seed Dir0 C~July.Septe--bjcr2012

.5t-I3Ft Oi.T a S)l SPEED------------------------..--

WIND DIRECTION CLASSES .........................

...SIABILITY CLASSES .----------

EU MU SU NI .SS MS ES 1O0AL.CLASS N NHVE Nit EN~E E ESE SE SSE.: S SSW sSW *wSWS W 1-141 N1. .NN1 TOTAL 0,00 0.00 0.00 0.00 0,00 0,00 0.00 0.00ýTO 0,00 0.00 0.o0 0-00 :0.00 0.00. 0,00 0.00. 0.00: 0.00 0.00 0.00 0.00 0,00, :0.00.0.00 0.00 0.00 0.00 0.00 0,00 0.00: 0.00 0.00 0.00 0.00 0.00 0.00G 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0 o00 0.00 0.00: 0,00 0.00 0.00 0.00.0,00.0.00.0.00 0.00.0.00 0,.00 o.00.:0,00.0.00.:0 00 0.00.0.00 0.00.0.00 0.00 0.00 0.00 0 00 0.O : 0 -o 0 0 0 00 0.ý 00 0.00 0.00.0 00 0.00.0.00 0" 00: 0.00 0p.00 0.00 0.00 0 o0 o0.00 0.00 0'.00 0.00 0.00 0.00 0.00 0.00 0,00 G 0.0 0,05 00o. 0..0.0 0...0.0 .0.o0 0..00 .0.00 0..00. 0.00 0.00 0.00 0,00 0,00.0.,00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.o0 0.00 0.00 0.09 0:00=0.14 0.00 0.00 0.00 0.00 0,00.0.00.0.00 0.00 0 .00 m0 0 0.00 0.00 0.00 0.00 0.00. .0.00 0.% :0,00 0.o00 0.00:0.00: 0,0 C100 0,00 0.00 0.00.0.00 Q.00 0.00 0.00 0.00 0;00 0.00 0.00 0.00 0.00 0.00 0.00 O.og 0,00.0.00.0.00 0.00 0.00 0",00 0.00 0.00 0.00 0.00 0.0o0 0.00 0.00: 0,00 0,00 0.00 0.00 0.00 oToo 0.00 0-.0 o 0.00'0-00 0.00 0.00 0.00.O000 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0:00 0.00 0.00o 0,00 0.0.0 0ý.00.0o0.0.00 0 00 0.00 0.00 0,.00 0.00 0,00.0.00 0.05 .0.05 0.09 0.14 0=,00 0.00 0.00 0-00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.00 0°.14.0.00 0.00.0,00 0.00 0.00 0.00 0,00 0,00.0.00 TT0 6.39: 4.60 3.03 4.09 5.38. .2.94. 3.86 8.13 9.65 8,96 7.90 8.36:. 7.17 5.65 !8.55 5.15 99.,91 4.50 4,09 5,65 30.70 22.56 20.36 12.04 Wnd Of rectfon by. Stabil Ity N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW. TOTAL 0.23 0,.23 0.37 3.22 1.42 0.64 0.28, 0.09, 0.46 0.18 2.16 I.24 0,37 O:09.0.18 0.09 0.05 1,52 0.92 0.23 0.05 0.23 0.00 0.09 1,671 1.61 0.41.0.1.4 0. 09;0.05.0.05 1.38 1.29 1:47.106 0.00 0.09 0.14 0 41 0,83 0.,74 0.00 0.05 0.05 0.87.0.97: 1, 1 0.78: 0.00.0.05:.0.32 1.56, 1.38 1,42.0,14 0"28 0.46 1 70.1,42 3.58 2.0G7 0,92 0,41 0.60 1,84 2.30 2.02.0,87 0.411.0.55 0.46:.2.48-1.93.1.156 0.51*0.64 0.55 i.06 3j.08.1.70 0.46.0.51 0.51;0;51 2.67 1.15 0.55ý0.37.0.32ý0.51:1.65.1.a 0.92 0.74 0.55 0.37 0.51 2.44 1.98 1.01 1.70 0.14 0.09: 0,32 1i.24 0.74 0:60.4.50 4.09 30.70 22.56 20,36 12.04-STABILITY:CLASSES-.

Extremely Unstable Moderately Unstable Sil.ghtly Unstable Netral:ýSiqhftly Stable Moderately Stable Extremely Stable.IWind o.rection by WInd Speed: N NNE NE EE ESE SE. SSE S SSW SW' 6W W WNW NW Nl N 014 lAL 0.00.0.92ý2.44 2.48.0_55 0,.00 0.00 0.00 0.69 2.71 1.10 0..09 0.00 0.o0 0.00.0.46 1_38 L1. 0.00'.0.. 69.1.75 1.65 0.00 0.00.0., 00 0, 00.1,42 3.63 0.32 o.0:0: 0. 00 0.00 0.83 2.02 D.09.0.00 0.00.0.00 0.0,0 0"87 2.71 o..28 0 00 0,00 0.00 1.38 06:0 0.00 0.00 1.98 0. 14 0.-05 0.00.0.00.244 e3.26.2.57*0,.46 0,23.0,00 0,00 3,86 1.70 0.37 0.00.0.00 0,00 4,14 2.25 6. 0 D.0.600 0.00 0.00 2.,30 3.17 1.l42: '0.28 0.00 0.00 2.48 2.25 O: V 0..05 0.00 0.00 0.00 3.26 2,90: 2.,11: 0.00 0,00 1.15.2.57 1..42:.0.03.0.00 0.0,00 0,09 25,32.49.13 22,84 2.25 0.28 0.001-WIND SPEED CLASSES-C:.A L M 3.6 -7,5 nwh.12.5 Rph 12,6 .18.5 aph 18,6 -24.5 rtih> 24.5 , mp.Murray & Treuel, Inc. 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963.9000 TABLE 10 r20-Byron Generating.

Stallo0.3 f t-.. n SP~ed rd 01r ct i n.octroerDecwlber:

2 012 NvntetW of C bwvatlons.

2200 values are Percen't 0ccurren.flc SPEED ----------..

..-- WIND DIRECTION CLASSES----STABILITY LSE....CLASS N NNE NE ENE E ESE SE ESE S SSW SW WSW. W WNW. NW NNN TOTAL EU MU SU N SS. MS ES TOTAL G0* SU ES 0.00 0.00 0:00 0.00 0,0 Eu... 0.00" u 0,00 Su o.00 N 0,14 3 SS 0.180,05 I S 0.05 Ig9o: A0.9 4.u mUo0.-N 1.21 iSS Oý9..o ,MS :0.41 ESý 0100 EU 0.09 mu0.Goo 8 Su 0.14 N 2,91 I~ S$. .0 5 2415 0;00 ES 0.00 0.00 0,00 0.00 0.00 0,00: 0.00 0.00 o~o 0.00 0.00 0. 1,i.0.09 0.0,00: 0.05 0..00:.:0.09.0.05: 0.77 0.09 0.00 0.00 0.0 0.05* .." .0.14 0.00 0.00 0.00 0,00 0.00 0.0(o.0o 0.00 0.00 0,00 0.00 0.1B 0.27 0.00 0.00 0.05 0.00 0.00 0.55 0.1.4 0.0.M 0.00.0.00: 0100: 0.0,0.0.14.0.14 0.00.'6,000 0.00:0 m.00 0.00 0.00 0 .,00 0.00 0,00 0.00.0ooo 0.09 0.14.43 0.05i 0.00.0. 051.0.00 0,73.0"; 09ý,.0.00 0,00 0.00 0.00 0,. 86" 0.41 0.05 0.00 0.00 0:00 o0,o 0.00 0. od 0.00 0,00 0.00:0. 00:" 0,00 0.09 0.09.0 18.0.09 0.00.0.0 0.00 1.18 0.86 0.59 0,05 0.00.0.00 0.00.0.,36 0.00: 0.00 0.00%.0.00 0.0 0,00 0.00 0.00 0.00 0,00* o.oo 0.00 0.14 0.05 0.00 0.00 0.00 0.00.0.o00 0.45, 0,32.0,32.0.18.0.00 0.00 0.09: 0.45 0:23 0.32:0.14 0.00 0.00 0.00'0,00 0,00 0,00 0.00 0.00 Oom 0. 09 0.05: 0.05:0.05 0.00 0.68'1,14 1.00%..0.50 0.00 0.00 0.05 0.,6 1.14 0.36 O.0M 0,00: C.o0 0:00 0A.0 0.00: 0.00 0-.00 0.00 0 100 0.09 0.09.0.100 0 00 0:00 0.00 0.00 0.82 1.00 1.41 0.36 0.00.005.0.14 1.64 2.41 0.82 0.09;.;O. 00 0.00 00:0.00 0. 00 0.00 0,00.0,00 0.00 0.00 0.32 0.05 0.05 0.00 0.00 0.os 1'. 6 f. 14.1.32 0.45::0.00.0.00 0.05 2".5 2.64 0.36 i.000 0.05 0.05'0.05 1.05:0.60 0o00* .0.00 0,00 0.00 0.00.0.00 0.00 0.00 0,00 0.00 0.60~0.09 0:45: 0,050.0.00.0.00 0.00.0, 05, 0.64 0.41 0.00;0.00 0.05 0.00 1.59 0.86 0.0.0 0o. S 0, 0.0.0.u 0.00 pi 0.* .0a~0.00 0.00 0.00: 0.:00: 0.00 0.18 0.41 0.05 0,00 0.00 0.00 0.00 1.00 0.95 0.05 0.00 0.00 0.05, 0.00 1,27, 0.18 0.00 0. 00.0.00 0..00 0.00 0.00 0..000 0.00 0.00 0.14 0.23 0.27 OlOS 0. 00 0.00 0.00 0.68 0.50 0.00 0,00 0.00 0.05 0.00 1.00 0.32: 0:100 0.00-2: 0.00 0.09 0.00 0.,27 0.00 0100 0.00 0.00 0.00 0o.0 0.00 o0.00 0.00 0.00 0.00, 0.00 0.23 o.3 6 0.23.0.00O 0:00.0.00 omo0 0.91.1.32 0;2T, 0.00.0.05 0.05 0.00:1.27 0.36 0.00 0,00 C.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 000.0.32: 0,41 0.14 U.5 0.00.0.00 0.00 1-23 1,77 0.05 0.00 0.00 0.00 0.00 0.00 0..00 0. 09 0.36 0 ..36 0.23 0.59 0.00 0. 09 2.41 1.,27 0.27 0.00 0.00 0.00 0.00 3.000 0.00 0.00 0:00 0.00 0.09 0.36 "" 0,217.0,18'0.00 0.05 1.09 1.55 0.55 0.05 0.00 0.05 0.00.1.05.0.00 0.00 0.00 0.00 0.23 0.09: 0,00 0.00 0.00:0;00: 0.00 0.0o 0,00 0.00 0 0.00 0,09 2.41 3.86 1.77 1,18 0.14: 014 0.14%6.J7: 15.27 M:/: 014.3 6,82 1.59 0.27 a.27 0.59'0.82.21.64 11.23,:1 91.0.32 0.41 0.41 0.27 i0.50.8= 77*3.00 0I,00 0.00.600 0.00 0.00.0,00*0,0.0 0.00.0.09 2.41 3.8 6 1.77 1.18 014 0.:27.15,..27 14.32 6.82 1.59:381.55: 0.05 0.09 0.05 0.23.0.27 0.05 1.73. 2.23.0.45 ;0.36.ý0,00 .0.00.i040, CM0 0.59.0:82 21.64 11.23.1.91 0.32:36:77 EU 0.00 I MU 0.00 3 50u 0.00-N 0.68.11 SEs 0.00 8MS 0.0 ES 0 00 0.05 0.00.0';00 0.00 0:00 0.00 0.00..0.00 0.00 M005 0.00 0.00 0.00 0.00 0,00, 0.00 0. 32 0.09 0.00o 0.00.0.00 0"00:0.05 0.00:0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00.0.00 0.001:oo 0.0.0 0.00 0.05 0,18 0.00.0.600 0 .00..0,00 0.09 0.41 0.41 0.00* 0cO0 0.18 0.05 0.00 1.36 0,91 0.o00, 0,00: 0,00 0.09 0.18 0.41.0,23 0:00.0.00O 0.05 0.00 0.05 1.77 0.14 0-. 00: 0600: 0 09: OMQ 0.09ý0.,86 0.00 0.00.0, :0.00 0.,00 0.05 1.23 0.00}0.00 0.27 0.50 8.7.3.00 0.00 0.'00.Murray..&

Trettel, Inc. 600 Fire. Bank Drive,.Stite A Palatiie.llinois 60067. (847). 963,.9000.

TABLE 10 continued-21.-Byron Geerne~air>

qto- !on 10, ftý P Spe~d ardý Cir~iltn.0c~6bn'-0ce n 201 SP SO ------CLASS N -----------------

..W..O MREC,,CN CLASSES .....................

.... ..--------

STABILITY CLASSES NE NE. ENE. E ESE KE SSE S SSW S4W SW W WNW IM RNW. TV A _ EIU MU SU N SS S .o-m9S s 0 14 0.05.0.00 0.00 0 00 0.00 a. 00 0.00 0.00.0.00 0,oo 0.00 0.00 0.00.0,00 0,00.0.00 0.00 0.00 0.00 0.00 MO,0 0.00" 0. 00.0 00 0900 0,.00 0.00 0, O0 0,00 0.00 0.00 0.00 0.00 0.00: 0.00O 0.00 0.00: 0 00 0,00 0.O0.0.00 0.00 0.00 0.00.0.00 0.00 0100 0.00 0.00 0.00 0,00 0,00 MO,0 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0 00 0.00 0.0O 0.00 0.00 0.00 0.00 0.00 O.M0 0.00 0.00 0:.00 0.00 0.00*0. 0 0.00 0.00 0.00 0.00 0.00 0.00 O, 09 0.00 a. 05 0,00 1. 00 0n.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00.0. 35 0_05 0,00 0 .00 0.-00 0.00 0.00 0.00 0.00 0.00 0; 00 0.00 0;.23 0.00 0.00.o:oo 0.00 0.00 0,00 0.00 0,00 0.00. 0.00 1-.00 10.,00.0.00 0.09 D C 0 .00 0.00 0 00 0.00 0.00 0.00 0.005 0.27 0,05 0.00 0.00 0.00 0.00 0.00 0.00 0.00%0..00 0:45.0, 00 o,0o 0.00 0.00 0.00 0..00 0.00 0.00 0.00 0,00 0.00 0, 318 0.Ow 0,00 0.00 0.00 0.,00 0.00ý0.00: 0.00.0.14 0,05 0.14 0..00 0.00 OAO 0,00 0,00.0 .00 0.00 0.00 0.00.0.27 0.27 0,18 0.05 1,7 0, .14 0.o0 0. 00 0.00 0.00 0.00 a.oo 0.00 0.00'0.18 0.05 1.; 77 0.00.0.00 2.41 EUl I G U T SU N 2SS.ES 0.00 0.00 0,00 0.00 0.00 0,00 0.00 0.00 0.00 0106 0.00 0.00 o.00 0.00 000." 0.00 0.00 ,0..00 0.00 TOT 7.59: 2.64 1.50' 3.82 3.55 2.73 6.09 10.00,12.95 7,45 5.05 3.68 7,41 8.00 10.09 7.45 100.00 1.09 1.18 1.73 49,86 32.55 10.50 3.09 100.00 Wind Direction by Stability S N NNE UE ENE .E: ESE S.E SSE. S SSW SW WSW. W WNW. Md NNW TOTAL.0.32 0.14 4.95 1.64 0,45 0.05 0,05 0.14 0..09 1.91: 0.32 0.09 0.05 0. 05.0.00 0.91 0.55.0.00 0:00 0.00 0,05 0.000 2.00 1.36 0.36 0.05 U.00 0 .0 .0 0,00: 1.68 0.95 0.77 0.14.0.00 1.09.0.59 0.64 0.32 0.00 0.05 2.50 2,50.1,41 0.64 O.M0 0.14 0.23 1.00 3 95, 2.23.0,459 0,05 0.05 0.14 5.41.5.09.1. ý73 0,50 0.18 0.09 0.05 3,82 2.86 0.45 0.00 0.00 0G14 0.18 2,86 1.77 0.09 0.00.0.00 0.14 ,0.00 1..05 0.27 0,05 0.09 0,05 0A9 4.45 2.23 0.50 0.00 0.14 0:05 0.36 4.59.2.64: 0.018 0,05 0.09 0.23 0,27 ,6. 41 2,00 0Q.50 0.59 0.14 0.05 0,05 3.09 3.05 0.82.0.23 1.09, 1.18: 1.73v 49.86, 32.55: 10.50 3.09-.STABILITY.CLASSES-Extremely.Unstable Roderately.

Unstable Slightly Unstable Neutral.Slightly'Stab.le Moderately Stable Extremely Stabl.e Wind Direction by Wind Speed*N NNE RE ENE E ESE SE SSE S SSW 9W W.SW W WNW rNW NNW TOTAL.--SPEED:.CLASSES-0.00.0.41: 2.64 3.68.0:68 0.18 0.00 0.00 0.:00 0.27 :0.45.099 0.73 1.23 0.27.0.05 0.05 0100 ;0..00 0.00 0.00 0..00.0.50.1.,59 1.32 0,41 0.00.0.00.2,68 0.36 0.05ý0.00:0.00 0.06 0.18 1.27 1.23.0.00 O.00 0.00 0 00 3.32.0.23: 0.00.0,00 0100 0.18 3', 59 6:14 0. 4i 0.18 0,00 0-00:0,45 3,95 6..00ý,14 0,41 0.00 0.00 0.59 1.64 2.50 0.23 a0.00.0.00 0.64 2.00 0,91 0,00 0.00 G.68 1.18 1.-36 0.36 0.09 0.00 0.00 0,82 2.50 1.173 2.00 0.36 0.00 0.00: 0.91.3.05 2 55 1.05 0,45, Q.4O.0.00 1.64 4.09 2,.95 1.27 0.18 0,00 0.00: 0.91 3.27, 2,.64.0.32 0,32 0.00 0.00 9,32 38.55 ,36,77 12.95.2,41.0,00 C .A L M" c 3,5 rch 3.6%- :7.5 mph 7') -12.5 Moll 12i.6 -18.5 mph l8".6:- 2 4 5> 24: 5 mph Murray & Inc; .% 6WFirst Bank Dritke, SUite A Palatine, Illinois .60067 (847) 963.9Q0 TABLE 11-22-30 ft. WfdnO Speed and DOrectlon"ana3 y -Doc --,tr-, 212 25OFt-30ft Eelti-T (F)vallUes are. Percen t Gccurrence, SE -- .............

...........

-OIRET-N CLASSES.----------

STABLITY CLASSES.......CLASS: N: NNE NE ENE E. ESL SE SSE S: SSW SW, wrSW W WNiJ MW4 N N14T OIAL EU MU SU 1 SS MS ES TOTAL 0.00.0.00 o~o 0.00 0.00 0.00 0.00 0.00 0.14 0.17 0.09 EU"1 MU.1SU N 3Ss ES'.41 S: 0,6.-NS 7 SS 0O,.69 S0,22%E ,' .o...0.00 0.00 moo 0.00 0.00 0.00 0;.00 0.00 0.00 0.00 0.0 0.18 0.07 0.03 0.03 0.10 0.10.0'.83, ,.44 10.13 0.0o 0.10 0,11 0.77 0.20 0.00 0.00 0.05.0:00: o.o7 0.01.0.00 0.00 0.00 0.00 0.00 0.00 Moo 0,00 0.00 0.0013 0.17 0.07 0.03 0:03 0.01.0.01 0.52 0.26 0.07 O.6i.0.02 0.06 0.06 0.87 0.25 q0o.0.05.0. 08.a 0.36 0,07 0.00 0.00 0.00.0.00.0.00..0.00* .0.00:0,00.. 0.00 0.0o 0.00 0.01.0.18.0.41 0. l 0.02 0.03.0.103, 0.76 0.14, 0.02'0.03 0:10.1.22, 0:,53: 0......0.01;0,01 0.00.0.00 0.18 0.03 0.00 Meo 0o1O 0.00 0.00 0.00 0.00 0.00, 0.00 0100 6.0.00 0.00 0.00: 0.16 1 0.23 0.14 0,.00., 0.00~0.0: 1 17 1013 0.67 0.21.0.02 0,01 0.10 1.10 06.21 0,02 0,00 0.00 0.00 0.00 0 .0 3.o.0.01 0.010 0.00.0.00.0-00 0.00 0.00 0.00 0,00.0.00 o.r 0,00 0.01 0.1.1 0,11 0.09 0.09 0,00 0.02 0..02 0.37.0.39: 0.49 0,26 o.oO: 0,016 0105: 0.47.0134: 0.29 0.048 a;01% 0.. 2:0.-14;0.00: 0Q.00o 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0,11 0.08: 0.00 0. 00 0.61.0.73.0.92 0= 37" 0-.00.0.05 0.47 0. 77 0l:29 0.07 0,00 0.02 0 26 0.20 0, .00 0.00Go 0,00 0.00 0.00 0.00.0. 00 o.Do0 0.00..0.00,.0.100"0,11l 0,16 06. 15 0.00 0..03 0.69 0.83 1.27 0.39 0.01.0.02 0.17 1.11: 1.84ý0.91 0 00 0.06.0.05 0.53 0..4 0.00.0.00 0.00 01. 00.0.00 0.00"0.00 0.00 0.00 0.03 0124 0.32 0.41 0.00 0.00 0.08 0.69 0.79 1.33 0.40 0.05 0.09*0.20 1.:5.3 0.25 0.01 0.07 0.11 60>0 0.96.0.64.0.00.0.00 6.00 0.00 0.00 0.00 0.00 0.00 0 .00*0.00 0.08.0..36 0..28.0.00.0.01.0.78 0.59: 0.64: 0165 0.24 0. 10.1,17 0A86 0,00 0.00 l0 l20 ,0.13 0417 0.83 0.64 0.00 0.00 0.00: 0 0 0 0,00 0,00.0.00 0,00.0.00 a..10l 0.009.mo.16 0.00 0.1 0.39 0.41 0.16.0~.01 0,06 1,11 1.08 0.20 0.01 0.1.1 0.18 0.10 1.14 0.33 0.00.0,00 0.01 0.06 Voý0.13 0.00 0.00 000o 0.006,00 0.00 .0.00 o O00 0.00 0,00 0.00 0o00 0o00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,16 0.25..0.30 0.41.0.41 0.46 0.21 0.08..0.06 .0.03 0.05 0.06 0.17 0.11 1,08 1.9 0.57 0,98: 0.08 0,21 0,06 .00: 0.10. 0.07 0.14 0.09 0.17 0 09 1.01 .1 ,'15 0.44 0.71 0.0,1 ;0.00 0.0.0 .0.0,00 0 02 01.0 0.0 0,0O0 0.02 0i:05 0:42 1.0 0.08: 0.15 0.00 0.00 Me:0 0.00 0.00l 0:00 0.00 0.00 0,00..0,00 0.00 0.00 0.00 0.21, 0.32 0.36 0.24 0:02 0.06 0.0,7.1.03 1.19 0.06.0.00 9:0 0.07 0.20 1.57 0.48 0,00 oxoz 0.13 0.85: 0.02 0.00 0.00 0.00 0,00 oloo o.ooA0.00 000 0.00.0.00 M.0.M0ID 0.00 0.00 0.00 o0OO 0.00 0.00 0.00 0.0 0. 00,.0.17. 0.0 0.41 0.23_0.41 .0.29.0.73 0.21'0.01. 0.01 0.05 0.01.0.11 0.08 1.-27 1.06ý1.25 0.96 0.22 0.24 0.02 *0l08 0.22 0.006 0.13 0.02.0.10 0.14 1.56 1.23 0.30 0.46 0.00 0O00..0.00 0.06 0u ,900 l.0,00II 0.05 0.00 0.06: 0.00 0.00 0.00 0,05 2.0 3,92 4.03 3.09 0.26 0.26 0. 44 1.14..14.03 12.39.6.86 1.86 1.12' 1.12 1.14 1.96 18.54 9.58 1:84 0.650 0.50 0.55 0.93: 7.'94 2:65: 0.00 0.00 0.00 0.00 0.06*0 :00 0.00*0.05.20.8..3.92 4.03 3.09 0.05 0,44 1.1.4 14.03 12.39:6.86 1.:86 3699T I EU kU 8. SUýi1 SS: 2mS 0:07 0.03 0.16.1.97 0.29.0,.01 1001 0.00 0.03 o.54 0.01 0.00.1.14 1.96 18.64 9.58.*1,84 0.25 34:44 0.05 0.05 0.96:0.01l 06.00 0.00 0.00 0,00 0.00 0.00 0.55 0.l93:7,'.4" 2.65 0.00.0.00 Murray &Treadel Inc. 600 First Bank Dayim'ic tte A, Pa~iztim, Il4ttais .60067 (847):963-.9000.

TABLE 11 continued-23-RYrcmin. Gnrait~rr Statlcn 30 ft, wige Speed an Direction.3arryeN~r'22012 250Ft-36Ft

&i.T ),Ja F SPE --- -- -CLASS. 1 NNE.-.........

--- i ECTI. CLASSES------- ý --------------

STABILT ---------

9'd .NNW 1W NNW~ TO TAL EU. MU SU N Ss fs ES TU;NE. E[E 1 ESE SE SS.S SW S*W WSW O 03 6.00 0.02 0.00 0.0 6-00 0,Ga0 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00.0.00 0.00 0.00 0.00.0.00 0.00 0.00 0.00 0,00 0.06 0.00 0.00 0. oo 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0,00)0.00 0,00 0.00 0.00 mol 0.00 0.00 0.00..0.00 0.00.0,00 0.00 0.00 0.00 0.00 G..00 0,00 0..00.0100 0.00 0.00 0.00 0.00 0,00 6. 01 0..01 0.00 0.o00 0.00 0.00 0.00 0.00.0,00 0.00 0.00 0,00 0. M 0.00: 0.100 0, 00.: Oao 0,00 0. 0*0 0.00 0.00 0.00 0.00 0..00 0,00 0,02 0.00 0.09 0.00 0., 0 0.00 0.00 0100 0.00 0.00 0.01 0.03 0.23 0.,05 0O, 0G3 0.00*0.,00 0.01 0,01 0.,01 0.00 0.00 0.00 0,02 01.002 0,05 0.33 0.0"9 0,03 03.00 0,00 0.0 0.00 0.02 0:00 0.00 0.00 0.02 0.09 0.00 0,00 0,00, 0,00 0.00 0.00 0.00 0.00 0,00 0.00 0.13 0.00 0.0A 0.00 0,00 0.00 0.. Co 0'.05 0.00.0.00 0 00 0,05 0.05 0134 0.02 0,10 0,.001 0,06, 0.01.0.,:06 0.00 0.00 0.00'0.03 0.01 0 34 0.00 0.60 0.00.0.00.0.0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.09 0.0.0 0.00 0.00 0 do.o.01,,00 0.00 0.00 0.00 0.00 0.06 0.03 0.01 0,00 0.03 0..00 0,00 0.00.0. "0 0.00 aodo, 0.00 0.00 0,00 0.00: 0.13 0.13 0.14 1.72 0,23 a 0.00.0,00 0.01 0.01 0.01 0.02 0.20 0.00 0.00 o0,o 0:14 0,17 0.23 O:0O 0,00.001 0.02..0.20 0.00 0.00 0.00 TOT 5.!3 3.35 3.13 4.26 5.55. 3.60 5.26 9...17 10.52.. 8.24 6.23. 5.75 7,.82 7.40 8.31. 5.47 99.90 2.03 2.27 4.27,44.56 28.78 12:73 5.26 Wind. Direction by .Stablllty N NNE NE: ENE E ESE SE SSE S SSW SW: WSW W WNW. NW NINW TOTAL.0.15 04.0 0.25 3.60 1. 12 0.40.0.13.0.09 0.21 0.23 1.77 0.83 0.200.06 0.111 0.015 1.87 0.76 0.14 0.056 0.09.0.0.7 0.16 2.34 1.25 0.26 0.08 0,02 0.01.0.18 2.47 1.61 0.92 0.34.0.00 0.02.0.09:1,18 1.00 0.87 0.44 0,00 0.005 0.07 1,46 1,86 1.31 0.52 0.0,1..0.10 0.25 2.52.3.32 2.34: 0.62..014 0.24 0:41 3.70 3131 1.90 0.83 0:44 0.26 0.48 3.21 2.48 1.04 0.32 0.13,.0.18 (Y:26 .o, 25.0.26 0.25 2.87" 2.85 1.93: .39 0.61 0.50 0.17 0.21 0.24 0.16 0.31 3,98 2,27: 0.67 0.18 0,13 0.40 4.03.2.02:0,40 0.24 0.25ý0,42.4.05 1.97 0,63 0376 0.10 0.05.0.22 2.62..1. 68 0. 29 2,03: 2.?27 4..27.44.56 28.78 12.73.5.26.-STAB ILITY. ACLASSES-Extremely Unstable Moderately Unstable SlIghly..Unstable Neýtral.Sliqgtly Stable Moderately Stable Extre-ily

Stable Wind Direction by Wind Speed N NNE NE ENE' E ESE SE SSE S :SSW SW. WSW W W NW fiV :NN TOTAL 0.00: M.8 2.04.2.54 0,60 0,07 0.00 0.:00.0.39:1.63: 1.19 0,14 0..00: ma0 0o.0 0,40: 0.92 1.26.0,55 0.00 0.00 0.00 0.47 1.58.1.9/0,23 0,00.o0.0 0,00 3.19 1.47 0.05 U0.0 8,0 0.00 0.42 1,56 1.23 0.37..0.02 0o.0 0.03 0.46 2.63 1,69 0.48 0.0O 0,00 1.00 0. 53 3,21 4,14 1. 1!0.17 0.00 0.00 1,01 3.91: 1.88 0.34 0.08 3.00ý101 2.17: 2. 58, 1.96 0.49 0.02 0.00 I.1.09 2.47 1.87 0.13 0.03 o'00 1,08 2.01 1.187 0.62 0.135 0 CO 1.31.2,48 2.111 2119 0.46-0.07 0,00 1,12 2.42 2.39.1060.00 1. 76 2,94 2.31 1.20 0.00 d0.00 0.10 0.78 13.16?.44 36,99:1,90. 34.44 A026 .12. 58 0.08 2,39 000 024-WIND SPEED CLkSSES.:CALM<. 3.5 rph 3.6 -,Vh;7.6 -1285 qPh.1]2A -18.5r Uph 18.6 -24,5 rph> 24.5. mch Murray. & Trettel, Inc. "600 First .Bnk Dri4e, Suite A Paatine, Illinois 60067: (847).963-9000. 5;5 Precipitation Monthly totals, and the maximum 24-hour and maximum I -hour precipitation amounts are summarized below. The month withthe most measured precipitation was October. The month with* he least measured precipitation was November.

The maximum 24-hour total was 1538" (July*) and the maximum 1. hour total was 1.20" (July*).Table 12 Precipitation Totals (Inches):-

2012.Byron Maximum Maximum Month Total 24-hour 1-hour, January 0.97 0.42 0.08.February i.7* .0.65*' 0.14*March 2.21 0.65 0.37 Apri "..2.93 '1.32 0.87.May 2.44: .1.18 0.70.June 0.84 0.43 0.11 July 3.29* 1.53.w 1.20*.August 2.73. 0.76 0.42 September 1.41. 0.35, 0.21 October 3.45 0.93 0.45 November 0.68 0.51 0.13 December 2.42* 1.25, 0.21*TOTAL: 25.08,* some data aremissing

-actual precipitationmay be. under-repotted Murravy &.Trette,.i.c.

6001.irst Bank Drive, Suite A. Palatine.".linois.

60067. (847)963-9000. 5.6 Doses Resultinq from Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from Byron airborne releases.Unit 1.: Dose, gamma air (1)beta air (2)whole body (3)skin (4)organ (s) (child-bone)

Maximum Value 4.360 3.070 8.261 1.650 4.057 x x x X X.10-4 mrad 1O3 mrad 10.2 mrem.10"3 mrem 10-1 mrem Unit I Compliance Status 10 CFR 50.Appendix.l Yearly Objective Sector Affected North-Northwest North-Northwest North-Northwest North-Northwest North-Northwest.

% of Appendix I 0.00 0.02 1.65 0.01: 2.70 gammamair beta air whole body skin organ 10.0 20.0 5.0 15.0'15.0 mrad mrad mrem mrem mrem Unit 2:-Dose gamma air (beta air (2)whole body (3)skin ý(4)organ (5) (child-bone)

Maximum Value 5.870 x 10"8 mrad 1.190 x 10. mrad 9.440 x 10-2 mrem 8.470 x 10*6 mrem 4.565 x 1071 mrem Sector Affected North-Northwest North-Northwest North-Northwest North-Northwest.

North-Northwest 01% of. Appendix I 0.00 1.89 30.00 3.04 Unit 2 Compliance Status, 10 CFR 50 Appendix I Yearly Objective gamma air beta air whole body skin organ 10.0 20.0 5.0 15.0 15,0 mrad mrad mrem mrem mrem t).(3)Gamma.Air Dose -GASPAR II, NUREG-0597 Beta Air Dose -GASPAR II, NUREG-059' Whole Body Dose -GASPAR 1,. NUREG-0597 Skin. Dose%- GASPAR II, NUREG-0597 Inhalation and Food Pathways.

Dose -GASPAR .11, NUREG-0597 Murray & Trettel, Inc. 600 FirsI.BantkDrkict.Suite A Palatine,lltinois.

.60067 (847). 963-9000

1. A PPEN DIX ..I...... ............

...I.IMurray & Trettel, m~c,: 600 First BanAt DriIve, Site A: Palatine, Illnois 60067 (847) 963-9000 Exelon Contract Number 455465 F4 R-28 7110 Byron Meteorological Calibration Page 1 of 8 Date: V"-POWER SUPPLIES+12.00oV +/- 2.OOOV~I-o- v Data Logger System Check: Expected 30.W WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Data Loqq.e 0X3 .mphmph:..,3.1. mph L(5-. '..G'mph S. -.mph Specifications

+1- 0.4 mph+/- 0.4 mph*+/- 0.4 mph+A- 0.4 mph+1- 0.4 mph Expected 30? WD 00 ,90.., 1800 270,.360°Data Lcgqer qb. -".0 Specifications

+1- 2"+12"+/-2Q 250'. WS 0.3 mphmph 23.12 mph:*45.93. mph 91.57. mph: Ohm__s.) 30' TEMP 40.670 250i TEMP 40.670 lid 20o';30'30' TEMP 12.174 250' TEMP 12.174, T L ATh THimph: +1A 0.4 mph 1 -6 ,mph +1-0.4 mph 2,3. j z .mph: +/-0.4 mph QS. 5 3 .mph +/-0.4 mph 9i' G mph +1-0.4 mph Expected 23.00F 23.0*F 100.0°F 100.00F1 O.0'F 250 'WD :'90'" 180'270*360°Data Loaner A C, ' 0.0.OL0 0 99,9O.*Specifications

+/7 0.50:+h- 051'+1- 0.18'+/m 0.50+/- 0.51+I-.0.18*+/- 2P:.+1- 2"+/- 2*+/- 2P+/-2*ATMid 250'-30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP: ATHI 250'-30'34.890 40.670 40.670 34,890.32.0'OF.23.0 0 Fý23:.0'F 32.07F 9.07F 31:i 3)+/b 0.5'+!.. 0.5"+t- 0.18'+/- 0.5'+/- 0.5':+/-- 0.18',1-S..i .Murral & Titcctd. Inc. , 600 FintBanki Diie Sufr A. -Platine, Iinrwis .6006 7 2 (847 U961;9000 Exelon Contract Number 4-55.465 F5.R-28 7/10 Page 2 of 8, Byron Meteorological Calibration Date: --I TOWER MEASUREMENTS

] Ambient Ice Bath Temperatures 250:,d T AF AL 30' Ambient.AF AL Measured Recorded Difference 3-6~ tj OF OF*O~ F OF-F-1-1.5- OF-.0 aF OF+/-0. 1 8*F-. F 30' Dew Point AF AL O' .( F O.. °F C' O}F O F, 1.0 F -7F+/-t2.7 0 F Specification.

'0.5 0 F*Winds 250'WS stall Forw. WD Redvr. WD 30'AF AL.t.; mPh 0?,- mph, P. 3 IN .0'L 0 .t AF 7 ., mph .:'z mph 0. I C. , ...AL Specification:

0,3mph .0.45mph 300/3900

  • 50*2100+/-:t50*

Tracking/wear.cxL comments:

i j-ýOf x t'i .TI ) r' G Wi.IA. ~jr jfq.. g'ýI r C. 4~i 1I'j 0 1 r~ ~Mur-raY& Trerr4 Inc- 60OFhvz Banlc Drve, Suite A. -N66ne, Iffinois -60067 3 (847) 963-9000 r.xeion 1oncracc Number 455465.F6 R-28 7/10 Byron Meteorological Calibration.

Page 3 of 8 Date: 1.- 5) 1 Dates of Last Wind Sensor Bearing Replacements:

30' 250_(6 mos.) Wind Speed: V " l 5"- *jZ-.(12 mos.) Wind Direction:

'- IL .-..5"-[30_ 250C_Aspirators:

0 OI Operation of Heatý Lamps: I LA PA ojT , -FT A ,I (Z.( I'Operation of Rain Gauge: jK Tips Poured. .Tips Recorded 5 Debris screen: in ciiýi Installed Removed UPS Check:_A4, Tower Lighting; Good Fair Poor Tower Condition Good Fair Poor Beacon: Side lights, Wiring Flasher.00 (z] r-1 0[00 0 1 I1! -0 I Paint a El.. E Shelter condition El oDE Note: Calibration Instruments:

Next Cal Due.AF As Found Psychrometer

-SIN -0 (,1il -. r- c1 4.AL = As Left Digital multimeter

-S/N -T') Jý261 tCCT 2. ci I -- = no change (AF=AL) Digital multimeter

-S/N -FS = Full Scale Technicians!, tVc'Jtir.4 , j ,44:,,_,_

_I Comments:.

I rvl.-( O,, M .oNi, 1 1 wr;) 10N-k 0q, ' Cý'L J: > ~4 11t 30 F -r Z(w fla~~ Ue~-.Cd ~ 1'1 M')(,d') F. LlI~ 0 Signature:

_,4 Muray lJi 600. Fir3t Drive,.Suite-A -Palatri, illinois..

6006.7 (84 7) 963.9000.

Exelon Contract Number 455465: R 7 System Response Check Page 4...Date: ) -Z Site:'Byron System: DigitalRecorder Low Scale CH 1L0.4 CH2.i CH3!O.4 CH4. it CH5 *0.5 :CH7 +/-0.5 CH8 +/-001 ,Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' OP Precip Expected 0.0 MPH 0 DEG 0.0:MPH. 0 DEG -22.0 DEG -10.00 DEG -22.0 DEG 0.00 IN Response As Found 09. :=1 Response 0 .0 0 , .-j ", -2 (As.Left ----.:Response

......Mid Scae .CH. 10.4 CH2.. ' CH3 0.4 CH4 *1 CH5 +/-0.5 CH6 *0.18 CH7 *0.5 Check: 30V WS 30' WD 250'WS 250' WD 30' T 250'. AT 30' DP Precip Expected .7 E R espod 50.0 MPH 1270 DEG 50.0 MPH- 270 DEG. 50.0 DEG 0.00:DEG 50.0 DEG 0.50.IN: Response.As Found Response (A C)As Left .--.- -.Response , _.Full Scale CH 1*0.4 .H2;1 CH3 *0.4 CH4+/-1 CH5. 05 .5. CH6 +/-0.18 CH7 '0.5 CH8 *0ý01 Check 30' WS 30'WDO 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 100.0 MPH 540 DEG 100.0 MPH 540 DEG 122.0 DEG 10.00 DEG 122.0 DEG 1.00 IN Response _ _ _ _ _ _ _ __ .... .... __. .. ... ........As Found 17, Response.

o. .- "]". .As Left.Response: A-V ý-'5-(ýMurray & Tietre4 Inc.. -600.Fiyst Bank Drive., Suite A .Paiazine, I1lliInais

.60067 2 (847) 963-9000ý Exelon Contract Number 45.5465 F Page 5 System Response Check Date: I- Is--Site:. Byron System: Data Logger.Low.Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT .30' DP Precip Check __"_".'Expected 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 .2 -22.00+/-0.5

-10.00+/-0.18

-22.00+/-0.5

.+/-0.01 Response .* .._ _.As Found Response ..O .,. ,. ..As Left -. .-Response ,. .... ...... ..MiMds S ale *. i*.. ..M 30' WS 30'WD .250'.WS 250' WD 250' T 250'A T 30' DP Check Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270 2. 50.00 *0.5 0.00 .+/-0.18 50.00 +/-0.5*Response As Found Response 0*' )9.. ,.c.' As Left ,.Response ..... ... ._ _...._ ...Full Scale mWS l.0m WD 60m WS 60m.WD 10m T 60m AT 1om DP Check ..... ......_ __._ __,,, Expected 100.0:+/-0.4 540-+/-2 100.0 +/-0.4 540 +/-2 122,00 +/-0.5 10.00 +/-0.18 122.00 +/-0.5 Response As Found b- ,r. OC., f0 D').l"ZZ.

z .-z 0.:,.t-) )2, Response _ _ _ ........As Left Response.Murr.y .T r.... 600. F .s.Bank@SuieA.

Talatne .60067 W (847) 963.9000 0 Exelon Contract Number 455465.R 7 Page. 6 System Response Check Date:~.Site: Byron Systepm: Pr.cepss Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30'WD 30'"WS 30"T. 250'.AT 30' DP 250' WD 250' WS.Expected .0+/-2. 0.0 +0.4 :!-22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0 +/-2. 0.0 +/-0.4 R espo nse ... .. .._ ..._ .... ..... ... _ _. .,... ....As Found Response ..5 ."- Z.. -20." o a.As Left Response --'...Mid Scale Y4000 Y4001. Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30V DP 250' WD 250' WS Expected 270 +/-2 50.0 +/-0.4 50.0 +/-0.5 0.00 +/-0.1.8 .50.0 +/-0.5 :270 +/-2. 50.0 +/-0.4 R espo nse _ _ _ _ ,. .. .. .... .. ... ... .. ...... ... _, As Found 67 G9 S7 14 Response '"1.z "W9 ______ .0. z& iL'Ast eft --, Response..

Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30'"WD 30'WS 30' T .250" AT 30'DP. O250' WD 250' WS Expected 540 12 100.0 +/-0.4 122.0 +/-0.5 10.00+/-0.18 122.0 +/-0.5 540 +/-2 100.0,.4 Response**

4 2 0. 04 As Found Response"______. .q.q .v-. '0.O( .zZ,. , ..As*Left,-

  • --' )22 Response ....Muwrray Treel, Inc. ."600 Fist Bank Drive, Suite A .Paiahi,.1Wn fis. 60067 2 (847) 963.9000 Exelon Contract Number 455465 F Page 7 System Response Check Date: ! - 1"2z Site; Byron System: Process Computer -Y4011 -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 301 WS, 30' WO 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected 0.0+/-+/-042 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0.00 +/-001 Response 0.As Found Response '(A .-Z.2() .- .OO As Left -- -.-Response .. " Mid Scale Y4.011. Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30. WS 30' WD 250' WS 250"WD 30' T 250' AT 30' DP Precipitation Expected 50.0 +/-0.4 270.t2 50.0 +/-0.4 270+/-2 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 0.50 +/-0.01 Responseo,..,...

..As Found cr. .-4 -Response lk-Ui AsLeft q9 q.7 -.Response...".

  • . .Full Scale Y4011 Y4012 Y4013 Y4014 Y4015. Y4016 Y4017 Y4019 Check 30'. WS 30' WD 250' WS 250' WD 30' T 250'AT. 30' DP Precipitation Expected 100.0 +/-0.4 540 +/-2 :100.0 +/-0.4 540+/-2 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 1.00 +/-0.01 Response ... .._.. .... ,,_.... .....As Found.Response

' 4q9, 100.0 .$ , S:1i o, OZ. -, , Response., Mrn'ray &? T'rette, Inc. -600 Ffrst Bank tA. ~Palatine, Illnois. 60067 W (847) 963.9000 Exelon Contract Number 455465 System Response Check Page8 Date: "-'- .Site: Byron SYstem; Control Room Indicators.Low Scale. 3 250. W Check S 30 5 WD :250"WD. 30' T 250'.AT 30' DP Expected .1.0 0.0.1.2 .0 15 0 +/-5 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 Response As Found ." 7 R5 Response ,"\O(.*, C" ?-..7-Z ---2.-2.As Left. --.-Response ......Mid'Scale 30' WS 250' WS .30' WD. 250' WD .30' T 250',AT 30' DP Check "__ _ __ _ _ ' ..Expected 50.0 +/-1.0 50.0 t1.2 270+/-5 270 5 50.0 !0U5 0.00 +/-0.18 5010:+/-0.5 R e s p o n s e ._ __... ._ __.... .. ... .... ." "_ ." _. _. .... ... .. ..As Found * .,.Response _ "_ _ ____________

__"" ___ -____As Left L. ,-.. -C "C Response "_,, " _*Full Scale 30' WS. 250' WS. 30' W .250' WD 30' T 250' AT 30' DP.. Chec__ k ___ ___ ___ _____ .........

..._ ___ ___ __ ___ __""_Chxecked Expected 1.00.0 +1.0 100.0 +/-1.2 540 +/-5 540+/-5 122.0 +/-0.5 10.00.+/-0.18 122.0 +/-0.5...Response*As Found t-...-Response-"____._"-- , -_" ___ ._As Left -i-- "-.Response

.... ... " .. .,_....A.:Munray Tictet n, r .- 4600Fist Blank-Nti, Suite A.- Palatine, Mvtioa 60067. W (84 7).963.9000 Exelon Contract Number 455465 F4 R-28 7110 Byron Meteorological Calibration Page 1 of 8 Date: 5-. Iz, POWER SUPPLIES+12.000V +/- 2.000V+___ _____V 1Data Logger System Check: Expected I 30'WS 0.3 mph 11.71 mph 23,12 mph 45.93: mph h 91.57 mph Data Logaerph , .1* G mph 23 \ mph&j5". L3 mph c 1mph* Specifications

+1- 0.4 mph*/- 0.4 mph+/- 0.4 mph+I- 0.4 mph+/- 0.4 mph: Expected.30' WD 00 900 i 800 270" 3600 Dat Loge 0: Spcfications

+ /-20+1- 2'+/-29+/- 21 250'WS 0.3 mph 11.71 mph 23.12rmph 45.93 mph 91.57 mph Ohms, 30' TEMP 40.670 250' TEMP 40.670.D. 63 mph +f-.0.4 mph F1.-76 mph +/-0.4mph A. 3.11 mph +/-0.4 mph mph +- 0.4mph ql.s, .mph. +/-0.4 mph Expected 23.0°F 23.0TF 0.00F 250" WD 09 900'1800.270°360'Data Loqgger 01 0. 2A °Specifications

+1- 0.5`+1- 0.5'+/- 0.18'+/-20+/-20+/- 2°+1- 20+/-26 TLo A TMId 250'-30'T Hi 30' TEMP 250' TEMP ATMid 250"30'30' TEMP 250' TEMP ATLo 250!-30'30': TEMP 250' TEMP ATHI 250'-30'12.174 121,74..34.8.90.z 40.670 40.670 34.890 1 00.0'*F.100.0'F 0.0TF 32.0'F:2 1.`F*9.0*F 23.0TF 32.0'F 9.00F O~3 0 T0.4 2- 7+1- 0.50*9. 0.5'+I- 0.18'+1. 0.5°+1- 0.50+1- 0.18'+/-0.51+/- 0.5'+/- 0.18'.-, -w -.Murray &

600 Fiu Bank Driit SfteA .
Paltaune,.I Utdis .600 67 .(847) 963.9000' Exelon Contract:Number 455465 F5 R-28 7/10 Byron Meteorological Calibration Page 2 of 8: Date: 5- t.- L 30' Ambient.AF AL Measured 5")...°F -:.F Recorded OF7 OF -OF Difference.

o,3 OFF -F Specification

+0.5 0 F 30!AF AL WS stall 0 3~mph m Unp h: FO .WD 39o a -- 0o.Revr. WD I Oc* -Trackinglwear TOWER MEASUREMENTS Ambient rJ Ice.Bath Temperatures 250' " T AF AL-OF-°F+/-0.18 0 F Winds.250'.AF AL mph. _,_ mph Ia -30' Dew Point AF AL L/j +/- OF -- OF 4.46 OF -- oF+/-2.7 0 F Specification 0.3mph +/- 0A45mph*300/3900 o5.210-1+/- 56 LComments:

30ý v.1. 1 I UOI (Pnved MT~ih (mnILeI~~~~~~" q NýAI"1J)LAAheAJW 5O De. .Mumry.&, Treuet4 InC.: 600-Fist Bank D#ivc;4 Sue A. Pizadatin,.Illinos,60067 2(847) 963.9000.

Exelon Contract Number 455465 F6 R-28 7/10 Byron Meteorological Calibration Page 3 of Date: "0(1i Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 roos.) Wind Speed: _-___- .-q" i2.(12 mos.) Wind Direction:

17- .-K- -30' 250'Aspirators:

&K.Operation of Heat Lamps: 0 K Operation of Rain .Gauge: .o.- Tips Poured -Tips Recorded 6-Debris screen: In Out i, Removed UPS Check:n.".G..

Fe Tower Lighting Good .Fair Poor Tower Condition Good Fair. Poor.Beacon Side lights.Wiring Flasher 0] r' E 0CC D rC C--r-C C1 Paint: StC]. D Shelter condition Ea .C I Note* Calibration Instruments:..

Next Cal Due AF = As Found Psychrometer -S/N.- -IC a T2 z AL = As Left Digital multimeter

-SIN -gqW60. oCT 20 vUa--- = no change (AF=AL) Digital multimeter

-S/N -FS = Full Scale, phnicians:

IAAL trYf1Ill.

L~4z. ________I omments: Signature:

141 Muora7:& TrTead, Inc. 600 Am Bank DNwe, Sui A. PaLatine, Ilinois, 60067. (947).961.9000 rn-i---~ ~ m~-xelftaonet~t NUih~r 4%Ws'V5 F.R-21 711(System: Response Check Page 4 of I Date: Site: Byron System: Digital Recorder"Low Scale CH 110.4 CH2 "1 CH3i0,4 CH4 1 CHS 0.5 CH6 *0.18 CH7 t0.5 CH8 +/-0.01 Check .30'-WS 30':WD 250' WS 250"WD 30'T 250' AT 30' DP Precip Chec .:0w 30:T 2W AT : , Expected Response 0.0MPH 0 DEG 0.0 MPH 0 DEG !-22.0 DEG -10.00 DEG -22.0 DEG 0.00 IN:: AsFound 0.0 0 4 O 4)o'-(Response0 As Left.Response __ ....__ ....Mid Scale. CH 1+/-0.4 " CH2+/-1 CH3 +/-0.4 CH4.1 CH5 1'50.5 CHB6 +/-0.18 CH7 0.5 CH8 +/-0.01.Check 30' WS 30' WD 250' WS 250' WD 30'T 250' AT 30'DP Precip Expected 500 MPH" 270 DEG 50.0 MPH 270. DEG .50.0DEG 0.00 DEG .500. DEG 0.50 IN Response As Found Response .... _As Left Response ______ ______ __ _ _ _ _ ______ ______ _ _ _ _ _Full Scale CH 10.A CH2.+/-1 C3+0.4 .. CH4 i1 CH5 0.5 CH6 +/-0.18 CH7 --.5 CH8 +/-o.01-Check 30' WS 30' WD 250' WS 250' WD 30' T: 250' AT :30' DP Precip Respe 100.0 MPH. 540 DEG 100.0 MPH 540 DEG 122.0 DEG 10.00 DEG 122.0 DEG 1 00 IN WAs noeund cL*j jn. n innnn nn 4 ...inYIIii Response ll l ... -l 7 lA A l .Vl As Left Response ______ __ _ _ _ _ ______ ______ ____________

___ ___AR, Murray & Ticcul, Inc. , 600 Filmi -Bandc DNV,c S~st A- Plr~ ~nW 06 (4)9390

ý-ýxe!9-tn t Nu .r 4"54% 4S F R-2 7/1 System Response Check Page5of Date.- i~Site: Byron System: Data Logger-Low :Scale LW Cle 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Check_ _ _ _ _ _ _ __ _ _ _ _ ______ _ _ _ _ _ __ _ _ _ _______ ____ __Expected.00d +/-0.4 0 +/-:2 0.0 +/-0.4 0+/-2 -22,00+/-0.5

-10.00+/-0.18

-22.00 +/-0.5 0 : +/-0,01 Response_ _ _ _.._._._As Found Response 0d. .-) ,Ao As Left .Response ........._,_.,, Mid Scale 30' WS 30' WD 250' WS 250' WD 250' T 250'. AT 30' DP C h e c k .. ....... ... .Expected 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 2701+/-2 50.00 +/-0.5 0.00 +/-0.18 50.00 +/-0.5 Response As Found Response 5'o00 0.00 50) ) -A) ,Q~As Left -.... -"-Response .. -.Full Scale IOmWS 10m WD 60m WS 60m WD 10m T 60m AT 10mDP C heck " .... .* ... .Expected 100.0 +/-0.4- 540:+/-2 100.0 +/-0.4 540:+/-2 122.00 +/-0.5 10.00 +/-0.18 122,00 +/-0.5 R esponse ......_...'_. ...._,_...._...

As, Found j r' " ... " .... ..Response ,0' C o ) OJ :O 0 I AsLeft ..Response *.,_*_ _---Momay & Trtt4, Inc. 600 First Bank Dnt i A.. Palatinel,,.

606 = (847) r96ip.0 9ww= saw= 400= AN ri"a INC=R-2E Page6 of f System Response Check Date: " Site: Byron System: Process: Computer -Y4000 -Y4006 Low Scale* Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30'WD 30':WS 30'T .250"AT 30' DP 250' WD 250' WS Expected t0+/-2 .00 +/-0.4 -22.-0+/-0.5 -A0.00 +/-0.18 -22.0 -0.5. 0 12 0.0+/-0.4 Response _... ... ......:As Found Response _ _ _ a- , -, As Left , " , Response.--_-_-__

__--_Mid Scale Y4000 Y4001 Y4002 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30'T ,250' AT 30' DP 250V WD 250' WS Fxpected 270t2 50.0 +/-0.4 50;0 +/-0.5. 0.00:+/-0.18 50.0 +/-0.5 270 +/-2 50.0 +/-0.4 R esponse .". _. *. ... .* ..., ." As Found.Response 5 .:As Left A Response.

..... .....Full Scale Y4000. Y4001 Y4002:. Y4003 Y4004 Y4005.. Y4006:Check 30' 30'V WS 30' T 250' AT 30' DP 250' WD 250' WS Expected .540 +/-2 100.0 :0.4 122.0+/-0.5 10.00 +/-0.18 122.0 +/-0.5. 540 +/-2 100.0 +/-0.4 As Found 1 3 a" qi'e, 1 14 1.61 ....Reponse: ....As Left " " ." ..Response ,,__ ... .. ,,, .iý. H U.c., v ft e-716oueK, L2LiCoF! 4/~ Oc o dw 61$jr.600 F.A n inos -60067 .(847) 963.9000 "O.e.F;ý:--onI N&M Flh R-2 711 Page 7 of System Response Check Site: Byron System: Process Computer -Y40. 11 -Y4919 Low Scale Y4Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4.019 Check 30' WS .30' WO .250' WS 250'.WD 30' T 250' AT 30' DP Precipitation Expected 0.0 +/-0.4 0+/-2: 0.0 0.4 0 +/-2 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 0.5 0.00 +/-0.01 Response.._.

._. ... .As Found R esp o n s e ) , , " ' -Z. o .00. .C: -7 2 ..As Left L). -.Response Cj... -, .Mid Scale Y4011 Y4012 Y4013 Y4014. Y4016 Y4016 Y4017 Y4019 Check' .301 WS 30'"WD .250' WS. 250' WD .30' T 250' AT. 30' DP Precipitation Expected Response 50.0 +/-0.4 270 +/-2 .500 +/-0.4 .270+/- 2 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 0.50 +/-0.01 As. Found.Response -_ .". ."5,._, ..o(.. .0 0 0...As Left -Response .'Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD .250W WS. 250' WD 30' T 250' &T 30' DP Precipitation Expected.

100.0 +/-04 .540.+/-2. 100.0 +/-0.4 540 +/-2. .122.0 +/-0.5 10,00.+/-0.18 122.0 +/-0.5 1.00 +/-0,01 Response As Found 5,31q3., -10.0 /.91 1.0 Response ""*" ...As Left 0 LOc)., --- -Response ____.urnay &Tret4 Inc. 600 Fi, Bank A -Palatine, Minou 60067 ,(847 )96.39000.

,, ,

Exelon Contract Number 455465 F1 R-2, 7/1f Page 8.0f o System Response Check Date: Site: Byron System: Control Room Indicators Low Scale Check :30' WS :250' WS 30'..WD 250' WD 30'T 250' AT 30'DP espected 0.0 +/-1,0 0.0 +/-..2 0 +/-5 0 +/-5 -22.0 +/-0.5 -10.00 +/-0.18 " 22.0 +/-0.5 Response_______

__ _ _ _ _ _ _______ ____ ___As Found Response -.o, -As Left 2

-- ---Z.--" 2.. .Response _______ ______________

Mid Scale 30' WS 250' WS 30'.WD 250' WD 30' T 250'. AT 30' DR Expected Response 50.0 +/-11.O 50.0 +/-1.2 270 +/-5 270+/-5.. 50.0+/-0.5 0.00 +/-0.1.8 50.0 +/-0.5 As Found Response .-...L" , .. :._.. ,, ' .. .As Left -_ --Response-SFull ... .FCe_ 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check_______________

________ _____ __espected 100.0 +/-1.0 100-.0 1.2 540 +/-5 .54.0 +/-5 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 Response: As Found Response qq,q IU7.: q.qe i l AsLeft -" ---Z...R~esponse..........

Murray: & Tir~teu, Inc. .600 Firs: Bank t.Nve, Suite A*Paatine,:

Ul.iru 60067 'S-(847) 963-9000 7-f)---'7; Exelon Contract.jNumber 455465 F4 R-28 7/'10!Byron Meteorological Calibration Page 1 of 8 Date: .-,A .POWER SUPPLIES+ 12.000V : 2..OOV+. 3-zq~ v Data Logger System Check: Expected 30' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph 250'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Ohms TLo 30' TEMP 40.670 250' TEMP 40.670 A TMid 250'-30'Data Lowoer o3 mph.i (AI.s, mph 13, '2- mph 1_6 _mph q9j1- mph Specifications.

/-0.4. mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph+1- 0.4 mph 30'WD Expected 00 900 1800 270'3600 Data Logger qo.4- Specifications

+1- 2'4/2*+/-20+/- 2.*'+/- 2*t,:3 mph +/-0.4 mph II -.k mph +/-0.4mph.,mph 4/-0.4 mph" 5-5.c3 mph +l-0.4.mph.

  • ~5L ( ,mph +I- 0.4 mph Expected 23.06F.23.0'F 0.0O*F 250"'WD 00 900 180'2709'3600 Data Logaer L'zq( 2cZ., ¢((,. '( 1,0 .o"5'Specifications

+1. 0.5':+/- 0.5':+/. 0.18'+I- 2°+/-20+/- 2'+/-2'+/- 2'T Hi 30' TEMI 250' TEMI A TMId 250'-30'30' TEMF 250' TEMF ,ATLo 250"346'I 30' TEMP.250' TEMP A ATHi 250'-30'12.174 12.174 34.890 40.670 1 00.0*F 1 00.07F 010T1 32. 0T 23.0"F-9.OOF 0+1 0.5'.+1- 0.5':+1A 0.18'0+1- 0.50 1/- 0.5'.+/:-b. 18'k 40.670 23.0°F /. .° +/-0.5'34..890 32.0'F 5i 1i7 ' +/I 0.50 9.001 *, o I 0 ,/- 0,18" Murray 6 Trettzi .Inc... 600.First Btanm. Dle, Suita A. Palat.in, Ih.noi:.a.

60067 2 (847).9663.9000 Exelon. Contract.

Number 455465 F5 R-28 7/10.Byron Meteorological Calibration Page 2 of 8 Date: Measured Recorded Difference Specification 30' Ambient.AF AL.. F F Z _ OF -F+/-0.56F: TOWER MEASUREMENTS Ambient Ice Bath Temperatures 250'1A T AF AL-1.l 17 F OF Sl OF OF+/-0.18°F 30' Dew Point AF AL Oci, .,0 OF O :F*&"TOF -F+/-2.7 0 F 30'AF AL i WSstall :3 mph o*3 mph Forw. WD; 2 a.* -Revr. WD Z:IO(,, -Tracking/wear Winds!250.'AF AL mph 0.37 mpho --- 0 Specification 0I3mph +/- ,.45mph, 300/3900 +/- 50 210P:+/-, 50 LComments::..

... .(".. ..l_ -O. LI-Misnay & Tre"rel Inc- 600 Fhsc& Bnk Dtive, Su4te:,A Palatine, Ilfinois-60067 3 (847) 963.9000 Exelon. Contract Number 455465 F6 R-28 7/10 Byron. Meteorological Calibration Page 3of*1 t2L Date: Dates of Last Wind Sensor Bearing Replacements:

.30' 250'(6 mos.). WindSpeed:, __ .. .. ..(12 mos.) Wind Direction: " ', '".\, 30' 250.'Aspirators:

D VL-Operation of Heat Lamps: d V%.Operation of Rain Gauge: Qj[.. Tips Poured ' Tips Recorded " Debris screen: Out Installed Removed*UPS Check: &V-. , t.is:*1tEO 61E'5 Tower Lighting Good0 Fair Poor Tower Condition Good Fair Poor Beacon Side. lights Wiring Flasher 13 D 1 IZ 0 0 1 0 0 I;] 0 0.Paint.Er 1 1 Shelter'condition IZ .El0! Note:;* Calibration Instruments:

Next.Cal Due AF: = As Found Psychrometer-S/N -.. .....2...AL = AsLeft Digital multimeter

-S/N -I -- = no change (AF=AL). Digital multimeters, S/N -FS = Full Scale: echnicians*.:

M cK I io 41 46 jf1 /A4 c ,./_iomments:" F.-Signa ture: Murray & Trerel, Inc. 6006.Firs.

Bank. Dv,.Suite A P.Latine, Illis., 60067 2 (847) 963.9000.

tow= VMU= 9==am=_ ____ ___ 6%xeb1fonEf~t Nt1TirAr 4"~5 11M=F R-2.711.System Response Check Site: Byron System: Digital Recorder Low Scale CH 1+/-0.4. ..CH2 t1 CH3+/-0.4 CH4 +/-1 CH5 .0.5 CH6'0.18:

CH7 +/-0.5 CH8 i0.01 Check 30' WS .30' WD 250'WS.. 250' WD 30'T 250' AT 30' DP Precip Expected 0.0MPH 0 DEG 0.0 MPH 0 DEG -22.0:DEG

-10.00 DEG -22.0 DEG 0.00.IN As Found* , ,,. -, ., b = , .,,, Response:

C ~ 000~~~. Za~As Left -,,,, , .. _- .-. 'Response _Mid Scale .H.1*0.4 CH211. CH3 +/-0.4 CH401 "1 CHS *0.5 CH6 +/-0.18 CH7 +/-0.5 CH8 +/-0.01_Check. 30' WS 30' WD) 250' WS 250' WD. 30'T 250' AT 30' DP Precip Expected.

50.0 MPH 270 DEG 50.0 MPH 270 DEG 50.0 DEG 0.00 DEG 50.0 DEG 0.50 IN Response________________

As Found ; 0 Ukq 01- 49.(Response '-r ~ 4 ~ As:Left ... ., Response-Full Scale CH 1+/-0.4 "CH21 ' CH3 *0.4 CH4+/-1 CH5 +/-0.5: CH6 +/-0.18 CH7 +/-0,5 CHB *0.0I Check 30' WS 30' WD 250' WS 250' WD 30'T 250'/AT 30' DP Precip Expected 100.0 MPH 540 DEG 100.0 MPH 540 DEG 122.0 DEG 10.00 DEG 122.0 DEG 1.00.IN*Response

.... ...As Found Respon .Se. 539' 19q__ -~.q 1 5393 12l7 1 iZ(.1 As Left ---Response:

,._ .. ..."Murray Trette!, Inc. ,600 Fint Bankni.ve, SuseA. .Palaizw., Iinou .60067 '3 (847) 963-9000.Page 4 of Date :.'.~

6MWxel=,MConCý4ft N&'Ar F R-2 7/11 Page 5 of System Response Check Pate: * '(j.Site: Byron System: Data Logger Low Scale .30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Check *_.......

.Expectedu..

Response 0.0 +0.4 0+/-2 0.010.4 0 +/-2 -22.00*0.5

-10.00+/-0.18

-22.00++/-0.5

+/-0,01 As Found Response 0,_ _ _ .__. _ _ -.o -(0.Ob .z.,) .0K As Left .. .. 'Response , .......Mid Scale'Mi Sce 30' WS. 30' WD 250'WS .250'WD , 250' T 250' AT. 30' DP Check ______ _____ _____Expected REsponse 50.0 +/-0.4 :270.+/-2. 50.0 +/-0.4 270+/ .50.00 10.5 0.00 +/-0.18 50.00 +/-0.5 Response As Found Response '.3_. _ 2. ) 0 ._ _ _ _ _ L -_ C_. _ .As Left -Response Full Scale 1Om WS 1Om WD 60m WS 60m WD 10m T 60m AT 10m DP C heck "_*_* .. ... ... .._* ......Expected 100.0.+/-0.4 540+/-2 100.0 +/-0.4 540 +/-2 122.00+/-0.5 10.00 +/-0.18 122.00,+/-0.5 Response As Found Response 1ICZ3.V

  • MO 0 £ .6c. (0. 4..Response __.Response

..

  • B I.... 6 '.(.) 9....y ...t4Ic.-66A t akDi A Pkie4ims6079 879390

.WON= "%xeln-Ftoff-JKNffth-r Ai 4"-S R-2f 711(System Response Check Page 6 of f bate : -f i Z, Site: Byron System: Process Computer-Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250', AT 30' DP 250' WD 250' WS Expected02 Repe2 0.0 +/-!.0.4 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 0 +/-2 0.0 +/-0.4 Response ...AsFound ,,.7, .Df Response ... 1 ____,-__ _ _As Left A -Response Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WO 30W WS 30' T: 250' AT 30' OP 250' WO 250' WS:Expected Response 270 +/-2 50.0 +/-0.4 .50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 270+/-t2 50.0'+/-0.4 As Found , " *As Left Response ...._ _ _....Full Scale Y4000 Y4001 Y4002 Y4003 Y-4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250':AT 30' DP 250' WD 250' WS Recnteds 540+/-2 100.010.4 122.0'+/-0.5 10.00 +/-0.18 :.122.0 +/-0.5 540+/-2 100.+/-+/-0.4 Response : ,, ... .... ..As Found ..9 R e s p o n s e , _ _ _ _ _ _ _, _'_ I 2. ,e t C .C 2 -/5-8 4- .' 9) 1g : -As Left ...Response ....e- LOA)j4$ 4trr~J r4A, Y'qo TK 0' -157 3q I'VAA.Y ZOI _Z, Mwurry:& Tieue4 Inc- v 60.0 First Bankc Drii S. Saite.A -Madatin, Ilrinuis%

60067 9 (847) 963-9000 t o ammSxeRiffýonf5ýMt Nauizor fAM5 F1 R-2 7/1 Page 7 of System Response Check Date- L/Site; Byron System: Process Computer -Y401 1,- Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30W WD 250, WS. 250' WD 30' T 250'&AT 30' DP Precipitation Expected ... ' ..... ... .Eecte 0.0+0.4 0 +/-2 0.0 +/-0A4 0 +/-2 -22.0 +/-0.5 -10.00 +/-0.18 -220 +/-0.5 0.00 +/-0.01 Response ___ ____As Found Response "-A O- , z-,O -i'O -- ., As Left Response .-Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016' Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precipitation Expected Response 50.0 +/-0.4 270 +/-2 50.0 +/-0.4 270t2 50.0 +/-0.5 0.00 0. 18 50.0 +/-0.5 0.50 +/-0.01 As Found Response .1 1.3 5 .C) ) , 'q.-(As Left --Response _ -Full Scale Y4011 Y40.12 Y4013 Y4014 "Y4015 'Y4016 Y4017 Y4019 Check 30' WSý 30' WD 250' WS ,250' WD 30' T 250' A T 30' DP Precipitation Expected 100.0 +/-0.4 540+/-2 100.0 +/-0.4 540 t2 122.0+/-0.5 10.00 +/-0.18 122.0.+/-0.5 1.00 +/-0.01 Response______

As Found ., Response ..... 3 As Left. ,-.9., ...Response -" Mu..ay & Inc-. 600Foyst Bank Dri'e. rice A aatim -60067 W (847) 963-9000 A-YL-F!R-2 7/1 Page 8 of System Response Check Date: q' '4 --Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30"'WD 250' WD 30' T 250': AT 30' OP C h e ck ..... .., .. _ .. ... .-_...... ..:Expected REspete 0.0 +/-1.0 0.0 +/-1.2 0+/-5 0 +/-5 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 Response.

.... ... ....As Found _-______q_ ___ __ 1__ _ C)--i' ).Response ., __ .... ..... .: As Left : ..-. .- .... -Response , Mid Scale .. ..' ... .i 30' WS 250' WS 30'WD 250'WD 30'T 250' AT 30' DP...E xpected ... ..." ..exponse 50.0 +/-,10 5.0.G+/-1.2 270.+/-5 270 +/-5 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 Response.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ __ _ _ _ _ _ _ _ _ _ _ _As Found R esponse .....,...... ..As Left IResponse

.... -.........Full s ca e... .::.. .. " ' ....FCe30c WS 250!:WS 30' WD 250' WD 30j T 250' AT 30' DP Expected esponse 100.0 +/-1.0 100.0 +/-1.2 5406+/-5 :540 +/-5 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5*Response

_______ _____________

As Found Response _____. _____ " N3 /7. l & .2?-As Left .. .:' ..-.. -.Response.~J HU6'Murray

& Trawzl Iviiz-.600 1ý't B~znk Dniv, Suite A.- Pgtatjn, Iflirois -.6006.7; WO ( 947)3-9000 G

Byron Environmental Audit -Request for Additional Information Response Question #: Met-7 Category:

Meteorology, Air Quality and Noise Statement of Question: Provide general aspects of meteorological data acquisition and management:

a. Type of instruments and instrument heights along with schematic diagrams of primary and backup monitoring system from towers to computer display.b. Provide a description of procedures for calibration and maintenance of meteorological instruments.
c. Provide a description of procedures for collection, evaluation, validation, and management of meteorological data, including quality assurance/quality control (QA/QC).Response: a. The meteorological tower is 250 ft high and is instrumented at two levels. Wind speed and direction are measured at 30 ft and 250 ft. Ambient temperature is measured at 30 ft. Differential temperature, referenced to 30 ft, is measured at 250 ft. Dew point temperature is measured at 30 ft. Precipitation is measured at approximately 3 ft.Instrument types and locations are described in each Byron Station Annual Report on the Meteorological Monitoring Program, Section 3, copies of which are provided for 2008 through 2012 in response to Request for Additional Information Question #Met-6. The table below summarizes this information for 2012.Measurement Sensor Type Location Elevation Wind Speed Climatronics 100075 F460 Tower 250 ft Wind Direction Climatronics 100076 F460 Tower 250 ft Differential Temperature Climatronics 100093 Tower 250 ft Wind Speed Climatronics 100075 F460 Tower 30 ft Wind Direction Climatronics 100076 F460 Tower 30 ft Ambient Temperature Climatronics 100093 Tower 30 ft Dew Point Temperature Climatronics 1001197 Tower 30 ft Precipitation Climatronics 100097-1 Ground 3 ft A schematic diagram of the meteorological monitoring instruments from the tower to the control room is attached to this response [Drwg. 6E-0-4031 EM01, Rev. E].b. Records of calibration and maintenance of meteorological instruments, which is conducted by a contractor, are provided in each Byron Station Monthly Report on the Meteorological Monitoring Program. As an example, the monthly report for January 2012 is attached to this response.c. Collection, evaluation, validation, and management of meteorological data are performed by a contractor.

Exelon Generation procedure CY-AA-1 70-1000 provides a standard means of review by Exelon personnel to verify that the requirements of the Offsite Dose Calculation Manual (ODCM) with, respect to these activities are met.The procedural provisions related to meteorological data are briefly described below." Exelon personnel perform the following oversight tasks regarding routine meteorology tower inspections and repairs: o Ensure that an annual inspection of the meteorology tower is conducted in accordance with the applicable ANSI Standard." Track issues identified during the inspection." Document tower repairs other than routine preventative maintenance." Verify that current structural integrity has been demonstrated for tower configuration, taking into account current aggregate loading from changes to tower instrumentation and structures.

o Conduct housekeeping tours of the meteorology tower at least annually.* Document and track correction of deficiencies and significant material condition issues.o Initiate an inspection of the meteorology tower within 60 days after the following weather events: " Wind speed gust greater than 90 mph." Ice of greater than 0.75 inches.* Exelon personnel perform oversight reviews of the data and information contained in routine monthly and annual meteorological reports prepared by the contractor as follows: o Verify that instruments are working properly and that documented instrument calibrations have been performed using approved maintenance and testing equipment.

o Verify that instrument maintenance and repairs are being performed in a timely manner.o Review reported data for accuracy and to ensure that required data recovery levels have been met.o Review data trends to verify continued consistency with ODCM default values, and initiate corrective actions, if necessary.

  • Exelon personnel periodically assess the business practices of the meteorological contractor to assure that technical and quality requirements are applied to the work and that records are stored and retained in accordance with contractual requirements.

List Attachments Provided: 1. Loop Schematic Diagram Meteorological Monitoring Tower Instruments

-"EM" System (Computer

& Analog Inputs). Drawing 6E-0-4031 EM01.2. Monthly Report on the Meteorological Monitoring Program at the Byron Nuclear Generating Station, January 2012. Prepared for Exelon Nuclear by Murray and Trettel, Inc. March 9, 2012.

Ft~Monthly Report on the Meteorological Monitoring Program at the Byron Nuclear Generating Station January 2012 prepared for Exelon Nuclear Warrenville, Illinois 60555 by Murray and Trettel, Incorporated 600 First Bank Drive, Suite A Palatine, Illinois 60067 (847) 963-9000 e-mail: mt(weathercommand.com web: htto:l/www.weathercommand.com For ExlreOnly Reviewed By:_Date:_________

Murray & Trettel, Inc. 600 Brit Bank Drive, Siate A Palatine, lUinois 60067 (847)963.9000 Table of Contents Section Description Page 1 Station Action Items .............................................................

1 2 Equipment Maintenance

......................................................

1 3 Data Recovery Summary ................................................

2 4 Summary of Billings .......................................................

3 5 Data Analysis ................................................................

4 6 Computer Processing

....................................................

4 7 Annual Report Preparation

.............................................

4 0 Murray & Trettel, Inc. 600 FiRst Bank Drive, Suite A Palatine, llinois 60067 (847) 963.9000 1. Byron Station Action Items Pending Action Items-none-Problem Recommended Solution Date**date Exelon was notified of problem or date of Monthly Report where problem was first reported 2. Equipment Maintenance at Byron A regular scheduled visit to inspect the equipment was made on the 5 th of January. The Routine Site Visitation Log, a record of existing onsite conditions, was completed during the scheduled visit. A copy of this log is included in this report.On the 5 e, a calibration of the meteorological tower was performed.

A copy of the log is included in this report.On the 9th, Joe Odom from ERIN Engineering requested data related to the operating license renewal. The data was processed and sent to Mr. Odom On the 12th, 2 wind speed sensors and 2 wind directions sensors were calibrated and given new bearings.No problems were encountered with the equipment during January and at the end of the month, no problems were evident at the site.Murray & Trettel, Ina. 600 Firt Bank Drive Suite A Iinois 60067 (847) 963-9000 3. Data Recovery The record of data recovery year-to-date is summarized in Table 1.Table I Byron Nuclear Station Data Recovery Summary January 2012 Hours in Month = 744 Measurement Hours to date = 744 This Month Valid Lost Edits Hrs % Hrs %Hours in year = 8784 Year to Date Valid Lost Edits Hrs % Hrs W 30Ft Wind Speed 250Ft Wind Speed 30Ft Wind Direction 25OFt Wind Direction 30Ft Temperature 250Ft-3OFt Delta-T 30Ft Dew Point 3Ft Precipitation 740 99.5 4 740 99.5 4 740 99.5 4 740 99.5 4 0.5 0.4 1.1 0.4 740 99.5 4 740 99.5 4 740 99.5 4 740 99.5 4 0.5 0.4 1.1 0.4 740 99.5 4 0.4 740 99.5 4 0.4 740 99.5 4 0.4 740 99.5 4 0.4 740 99.5 744 100.0 4 30.1 0 0.3 740 99.5 744 100.0 4 30.1 0 0.3 A V E R A G E

  • 99.5 99.5* average of priority parameters (all except dew point and precipitation)

Joint Recovery of Speed, Direction and Stability This Level Valid hrs Month Lost hrs Recovery I Year to Date Valid Lost Recovery hr .hrs Lower Upper 740 740 4 99.5 4 99.5 740 740 4 99.5 4 99.5 Data Recovery Scores Summary January Year to Date Byron Nuclear Station All Exelon Sites 0 16 0 16 Murray & Trettel, Ina. 600 First Bank Drie, Suite A Palatin, IUirwis 60067 (847) 963.9000 4. Summary of Billings for Equipment Repairs, Replacement Parts, and Other Work not Included in Fixed-Cost Maintenance Agreement

-January 2012 Byron Description Meteorological equipment maintenance Meteorological parts, materials

& contractors services Special Request Total for Month: Year to Date Total: Cost$ 180.00$ 793.01$ 85.00$ 1,058.01$ 1,058.01 Murray & Trettel, Inc. 600 Fnt Bank Drite, SuzWc A Pakadiei llinois 60067 (847)963-9000 5. Data Analysis (Data Reduction and Processing)

The Campbell Scientific CR1000 data logger was routinely interrogated to obtain hourly average data of wind speed, wind direction, ambient temperature, differential temperature, and dew point temperature.

Wind sigma (standard deviation of wind direction) and precipitation data were also obtained.

Missing data logger values were replaced with recorder data, when available.

A professional meteorologist then reviewed the data, calibration findings, maintenance reports, computerized quality control checks, and other information and determined which data were valid. Only valid data were retained in the data base.6. Comouter Processing Computer programs were run to generate summary tables of the hourly averages of the meteorological data as well as other statistics based on the monthly data record.A table of means o4ý.extremes of the measurements recorded during the month is included in this report. Wind direction shears (variance of wind direction between levels) are also included in the table. Relative humidity was calculated using ambient and dew point temperature measurements.

7. Annual Reoort Preparation Joint frequency stability wind rose tables of hourly data are generated quarterly and will be included in the annual report. These tables indicate the prevailing wind direction, wind speed, and stability classes measured during the period of observation as well as the joint frequencies of occurrence of the wind direction, wind speed, and stability classes.Murray & Trettel, Inc. 600 Firt Bank DNw, Suite A Paktine llinob 60067 (847)963.9000 Byron Generating Station January 2012 Miss Valid Parameter Mean Max Min Hrs Hrs 30Ft Temperature (F) 27.5 54.0 -1.6 4 740 30Ft Dew Point (F) 20.1 47.9 -15.0 4 740 Relative Humidity (calc) 74.7 100.0 34.8 4 740 30Ft Wind Speed (MPH) 9.6 26.4 Calm 4 740 250Ft Wind Speed (MPH) 15.6 36.8 1.4 4 740 250Ft-3OFt Delta-T (F) -0.1 9.8 -1.9 4 740 250 -30 FT Direction Shear (deg) 6.9 159.0 -179.0 8 736 30Ft Sigma Theta (deg) 11.9 48.0 4.0 4 740 250Ft Sigma Theta (deg) 7.1 47.0 1.0 4 740 3 FT Precipitation IN 0 744 Monthly Total .....0.97 Max 24 Hour Total ...0.42 Max 1 Hour Total ...0.08 There were 744 hours0.00861 days <br />0.207 hours <br />0.00123 weeks <br />2.83092e-4 months <br /> in January Table prepared on 3/ 5/2012 at 12:49 Byron Station Differential Temperature Distribution (degC/100m) 1/2012 250-30 ft-7.5-7.0-6.5-6.0-5.5-5.0-4.5-4.0-3.5-3.0-2.5-2.0-1.5-1.0-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE DT LT DT LT DT LT DT LT DT LT DTLT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT LT DT-7.5-7.0-6.5-6.0-5.5-5.0-4.5-4.0-3.5-3.0-2.5-2.0-1.5-1.0-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 0 0 0 0 0 0 0 0 0 0 0 0 0 81 309 101 89 44 24 22 15 12 8 8 9 8 3 3 1 1 1 1 NRC Stability.Classes Unstable Neutral Stable TOTAL NO. HOURS 3 412 325 740 TABLE PRODUCED 03/05/12 13:06:09 Exelon Contract Number 455465 F2 R-28 7110 Byron Site Routine Site Visitation Log Date: I '-Begin: 0 CST End: 12-30 CST Operation of digital recorder [9 OK _"_Operation of data logger I1 OK r"!Digital Recorder Readings (Taken at I I 19 CST)SPEED DIRECTION TEMP AT DP 30ft. mph 3 1 ___FF_250 ft. !.. mph 0, 7 ooF rlo Speed and Direction values agree with visual indications?

IR" Yes r-0 UTD 0"_Rain gauge check made at CAL CST E- No rain gauge check made due to precipitation Tips Poured 6- Tips Recorded 5 Psychrometer Measurement Reading (Taken at CA L CST)Dry bulb: O-"_ =F Wet bulb: ____F Dew Point O"__ F COMMENTS: Technician:

____ _____Mwray & Trent, Inc.

  • 600 FPnt Bank DN.e, Suate A .

inis " 60067 9 (847) 963.-9000 Exelon Contract Number 455465 F4 R-28 7/10 Byron Meteorological Calibration Page 1 of 8 Date: (" "7, POWER SUPPLIES+12.000V + 2.OOOV+ Ir.11io v Data Logger System Check: Expected 30'WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph 250' WS 0.3 mph 11.71 mph 23.12 mph 45.93 mph 91.57 mph Ohms T Lo 30' TEMP 40.670 250' TEMP 40.670 A TMId 250';30'Data Lowaer 0 .3 mph L % .!fmph 2,. 1. mph q5y,- mph 91, SLT mph Specifications

+/- 0.4 mph 0.4 mph+/- 0.4 mph+1- 0.4 mph+1- 0.4 mph Exnected 30'WD 00 900 1800 270'3600 Data Loaaer 96, 2.-I"-79. 9"; .:2 4A.I 0 Specifications

+1- 20+1-20+1- 2+/.-2+/-20.3 mph +1- 0.4 mph)_L'._ ,mph +/-0.4 mph;,3. 1 L mph +-0.4 mph qI-, ý'3 mph +l-0.4mph ,5"- mph +1- 0.4 mph Expected 23.O0F 23.00F 0.0°F 250'WD 06 900 1800 2700 360'Data Looaer 02,00°Specifications

+1- 0.5'+/- 0.5'+1- 0.180+/-20+/-20+/-20+/- 2*T Hi 30' TEMP 250' TEMP A TMId 250'30'30' TEMP 250' TEMP ATLo 250'-30'30' TEMP 250' TEMP ATHI 250'-30'12.174 12.174 34.890 40.670 40.670 34.890 100.0"F I 00.0'F 0.0'F 32.0'F 23.00F-9.0'F 23.OOF 32.06F 9.0'F 0,00.31. 5 j7.jq-9,01 .)-.'2 I .-3 1 0,+/- 0.50+/- 0.50+1- 0.18°+1- 0.50+/-0.5'+1- 0.18'+/- 0.50+1- 0.18'AX 1-s-i)Muiray & Trette4 Inc.

  • 600 FRnt Dde, Suit A- Palatid, IIftis
  • 60067 3 (847) 963.9000 Exelon Contract Number 455465 F5 R-28 7/10 Byron Meteorological Calibration Page 2 of 8 Date: 5- '- V 30' Ambient.AF AL Measured ?3 14 OF -OF Recorded '316. Z7 *F -OF Difference

.0-' OF -OF Specification

+/-0.5 0 F is TOWER MEASUREMENTS 0 Ambient -] ice Bath Temperatures 250' A T AF AL[1l, 2 OF "- O_ F-I. Oo°F OF a 0 S" OF -OF*0.18°F 30' Dew Point AF AL____oF -F O'" F "" F___F -OF*2.7 0 F 30'AF AL WSstall _L1 I mph , .mph Forw. WD 0 8 Revr. WD X,. 4 0 Tracking/wear IKi" Winds 250'AF AL 0.3 mph .. mph S6.L 0 a0.0o Sbeclfication 0.3mph +/- 0.45mph 300/3900

  • 50 210° +/- 50 Comments:

WS ibýf16 0-1 0oi U5 j~ le 4 7(0 LJ,j S tl~f 40es j -I ew ,,;4 wI-5 ike 6x ,ýe d VA4V 0 kOI Muiway & Tiettd, Inc. -600 Fint BankJ Diwe Suite A.- Maline, Illinois -60067 9 (847) 963-9000 Exelon Contract Number 455465 F6 R-28 7/10 Byron Meteorological Calibration Page 3 Of Date: f- 5-. J1 Dates of Last Wind Sensor Bearing Replacements:

30' 250'(6 mos.) Wind Speed: 1 S .. "5 J'-(12 mos.) Wind Direction:

f " It- I "" " 30' 250'Aspirators:

o L 0 iL-Operation of Heat Lamps: I Lb~4P c vr L.cFTr Operation of Rain Gauge: 6 Tips Poured 6 Tips Recorded 15 Debris screen: In Installed Removed UPS Check: Tower Lighting Good Fair Poor Tower Condition Good Fair Poor Beacon 10 [0 0] Paint [a 0- 0I Side lights IZI E1 El Wiring [7] Di El Flasher Il El -1: Shelter condition 0 0 E Note: Calibration Instruments:

Next Cal Due AF = As Found Psychrometer-SN- "/N I '.L 2-I L AL = As Left Digital multimeter

-SIN -f" a 'l4 OF.T 2. Co L.-= no change (AF=AL) Digital multimeter

-S/N -FS = Full Scale Technicians:

(.tke Nowt" tOl4 p. __ _, 4_ _'_AX Comments: ,j~~~~~~-t-tzo~Y00 4,.C.y CL ,~((Wq+~e~it 14 I1ME A ' .r~L~fl\4... CUfFiI~dA Cq:c q~ 4q011 30 Fr VJ ( ZVo f2 1?Signature:

A51, -13v5-0 Muiray & Trettel Inc. -600 Fiuzt Bank Dive, Suite A -Pal atirte, liinois -60067 2 (847) 963,9000 Exelon Contract Number 455465 F R-2 711 Page 4 of Date: ---System Response Check Site: Byron System: Digital Recorder Mid Scale CH 1+/-0.4 CH2 *1 CH3 *0.4 CH4 *1 CH5 *0.5 CHS +/-0.18 CH7 *0.5 CH8 +/-0.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 50.0 MPH 270 DEG 50.0 MPH 270 DEG 50.0 DEG 0.00 DEG 50.0 DEG 0.50 IN Response As Found Response S)b 2ALOSLS1 oC C 4 As Left ---Response Full Scale CH 110.4 CH2 *1 CH3 +/-0.4 CH4 *1 CH5 *0.5 CH6 10.18 CH7 *0.5 CH8 10.01 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Expected 100.0 MPH 540 DEG 100.0 MPH 540 DEG 122.0 DEG 10.00 DEG 122.0 DEG 1.00 IN As Found Response q.2____As Left --,,, -Response A2, Munuy & Twm~L Inc. -600 Fmt Bank Driiw Suitz A. Pabzrire, Illinois .60067 V (847) 963-9000 Exelon Contract Number 455465 R-2 7/1 Page 5 of System Response Check Date:i- S--Site: Byron System: Data Logger Low Scale 30' WS 30' WD 250' WS 250' WD 30' T 250' AT 30' DP Precip Checked Response 0.0 +/-0.4 0+/-2 0.0 +/-0.4 0 -22.00-0.5

-22.00 +/-0.5 .os +/-0.01 As Found Response L Oo1 As Left ... -..*--.Response .....Full Sca IomWS 1Om WD 60m WS 60m WD 10m T 60m AT 10m DP_Check _ _ _ _ _ _ _ _ _ ______Expected 100.0 +/-0.4 540+/-2 100.0 +/-0.4 540 +/-2 122.00 +/-0.5 10.00.+/-0.18 122.00 +/-0.5 Response As Found -,.,.. U) /Response 0_ _ _ _*__As Left .Response Mfrray & Trmk, Inc. .600 FiRn Bak A* IUnas-. 60067 9 (847) 963.-9000 Exelon Contract Number 455465 r R-2 7/1 Page 6 of System Response Check Date: ' -I Z Site: Byron System: Process Computer -Y4000 -Y4006 Low Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 0 t2 0.0 +/-0.4 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 *0.5 0 +/-2 0.0 +/-0.4 Response .....As Found Response .05 -ZZ, -- .. o.2.. IO " As Left .---Response Mid Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 270 +/-2 50.0 +/-0.4 50.0 +/-0.5 0.00 +/-0.18 50.0 +/-0.5 270+/-t2 50.0 +/-0.4 Response As Found Response (6..9 , ,o O0, _ _, _"___'As Left -50. -Response Full Scale Y4000 Y4001 Y4002 Y4003 Y4004 Y4005 Y4006 Check 30' WD 30' WS 30' T 250' AT 30' DP 250' WD 250' WS Expected 540 +/-2 100.0 10.4 122.0+/-0.5 10.00+/-0.18 122.0 +/-0.5 540 +/-2 100.0 +/-0.4 Response As Found Response 5"516._` _99_._ 12 1.-6 10.0i __ _z, _ _.As Left Response --_"-"__ _ _ _ _ _ _. ____-- __-&S6 390"& Twuel, Inc.

  • 600 1ret Bank Dru, Su.tg A. Pa~adrag 60067 2 (847) 963.9000 Exelon Contract Number 455465 F1 R-2 7/1 Page 7 of System Response Check Date:--!"" 5=- 1 2 Site: Byron System: Process Computer -Y401 I -Y4019 Low Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' ,&T 30' DP Precipitation Expected 0.0 +/-0.4 0 +/-2 0.0 +/-0.4 0 +/-2 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +0.5 0.00 +/-0.01 Response As Found Response -"Cj- -As Left -...-Response Mid Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' tAT 30' DP Precipitation Expected 50.0 +/-0.4 270+/-2 50.0 +/-0.4 270 +/-2 50.0 +/-0.5 0.00 +/-0.18 50.0 10.5 0.50 +/-0.01 R~esponse As Found *A -LiC1L , -1 Response £i- .WJ 6'" As Left ,.-Response Full Scale Y4011 Y4012 Y4013 Y4014 Y4015 Y4016 Y4017 Y4019 Check 30' WS 30' WD 250' WS 250' WD 30' T 250' t 1 T 30' DP Precipitation Expected 100.0 +/-0.4 540 +/-2 100.0 +/-0.4 540 +/-2 122.0+/-0.5 10.00 +/-0.18 122.0 +/-0.5 1.00 +/-0.01 Response As Found Response !5_6q, _ Sl i 10.0?1 1.00 As Left 3L -3qZ--Response __ _ _ _ _ __ _ _ _ _ __ _ _ _ _ __ _ _ _ _ _ _ _ _ _ __ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _a Muffay &' Treczel Inc. -600 PFits Bank 'Ii# A~ -gPaltie Illinois -60067 2 (847)963-9000 Exelon Contract Number 455465 F1 R-4 7/1 Page 8 of System Response Check Date: I - 12 Site: Byron System: Control Room Indicators Low Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected 0.0 +1.0 0.0 +/-1.2 0 +/-5 0 +/-5 -22.0 +/-0.5 -10.00 +/-0.18 -22.0 +/-0.5 Response ., As Found Response ___ __0- " -.. 2A-As Left ..---Response Mid Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP ECheck Expected 50.0 +/-1.0 50.0 +/-1.2 270 +/-5 270 +/-5 50.0 *0.5 0.00 +/-0.18 50.0 +/-0.5 Response., As Found c Repose ..... -l ,q1,-0 :2(..t, Z,, '--'0 ."- 50-0.Response , _Full Scale 30' WS 250' WS 30' WD 250' WD 30' T 250' AT 30' DP Check Expected 100.0+/-1.0 100.0 +/-1.2 540 +/-5 540 +/-5 122.0 +/-0.5 10.00 +/-0.18 122.0 +/-0.5 Response As Found 9O0 Response ___,". "OCV.. I..-As Left .-Response ..Muwry &' Tirmek Inc. -600 Fiat Bank Diw, Suite A.- Palatine IMinojs -60067 W (847) 963.9000 Equipment Maintenance Log AI In-house work 0 Field work Exelon contract Number 455465 Al 7/10 R-28 , Weekday 0 Weekend I Holiday Page _I_ of_4._Site: R&ron Reason for work/ Natum of Problem: 76e Odor , " .-j Pnegrazq Work Performed/Action taken: w as. prxce<5esy anJ se,+4r) Mir. oc~t'.Measuring Test Equipment Used Unit S/N Work Completed?

ICYes 11 No Calibrated?

01 Yes 0 No NA 0 Meteorological Date Technician Re Hours OT Hours 03 Microtel-. ,70 Visibility monitor/fog warning signs__Other -.Q a t J " Billable Labor ... rg ""_ ot Travel: -ml $ "" tolls Misc: _________

__Muay & Trettel, Inc.

  • 600 FiAt Bank Ddyi, Sute A. Palatne, Illinois 60067 2 (847) 963.9000 Equipment Maintenance Log e Site:51 ,% In-house work 0 Fieldwork Exelon contract Number 455465 Al 7/10 R-28 jDate(s):Weekday 03 Weekend I Holiday Page / of_/.Reason for work/ Nature of Problem: 0?(.%o j D bean eM)Work Performed/Action taken: t j Q" -. , , 6J Measuring Test Equipment Used Unit S/N Work Completed?,>ZYes E0 No Calibrated?

X Yes El No Fl NA X___ Meteorological Date Technician Rea Hours OT Hours El MicrotelII ____ _ EVisibility monitor/fog warning signs F Other Billable 2 -Labor reg ot Travel: -- mi $ -tolls Misc: Murray & T'ette,, Inc. 600 FiRt Bank DIK Sute A

  • Palatine, w., lis.60067 2 (847) 963-9000 Byron Environmental Audit -Request for Additional Information Response Question #: Met-8 Category:

Meteorology, Air Quality and Noise Statement of Question: Provide noise emissions studies conducted at Byron, if any.Response: No noise emissions studies have been conducted at the Byron Station site since 1988, when a confirmatory sound level survey was conducted to address a concern described in section 2.2(2) of the initial Byron Environmental Protection Plan (EPP). A copy of the 1988 confirmatory sound level survey could not be located.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: Met-9 Category:

Meteorology, Air Quality and Noise Statement of Question: Provide ambient noise survey in and around the site, if any.Response: Measurements of ambient noise levels taken in communities located within 5 miles of Byron Station were reported in the Byron Environmental Report-Operating License Stage (ER-OLS) (CoinEd 1981 a), section 2.7, a copy of which is attached to response.

No reports that ambient noise level measurements have been taken that time were found.List Attachments Provided: Byron ER-OLS, Section 2.7 Byron ER-OLS 2.7 NOISE This section summarizes the ambient noise levels in the vicinity of the communities located within 5 miles of the Byron Nuclear Generating Station -Units 1 & 2 (Byron Station).

Particular attention was also directed toward obtaining acoustic noise levels where high voltage transmission lines are located close to communities.

All measurements were made keeping in mind applicable guidelines; i.e., of the Illinois Environmental Protection Agency (Illinois EPA), the U.S. Environmental Protection Agency (U.S. EPA)., and the Department for Housing and Urban Development (HUD). Noise effects in relation to adjacent occupancy are considered in Chapter 5.2.7.1 Approach Ambient noise measurements were made at the village limits on the side towards the direction of the station. Where a transmission line right-of-way (ROW) passes close to a community, the ambient noise measurements were taken at the village limits on the side towards the direction of the ROW.Two communities (Byron and Oregon) lie within a 5-mile radius of the Byron Station. They are identified in Figure 2.7-1. Both of the communities, however, are more than 1 mile from the transmission line ROW's.2.7.2 Procedures In order to be compatible with federal and state noise standards, sound measurements were made with a Type 1 sound level meter while continuous samples of the ambient noise were being tape recorded during the day and night for periods of at least 20 minutes. Care was taken during the recording period to ensure that the recorded sample would be representative of the existing ambient noise levels.The tape-recorded data were analyzed to yield both the cumulative distribution of the A-weighted ambient noise levels (see Figures 2.7-2 and 2.7-3) and the Leq, which is the A-weighted Equivalent Sound Level as defined by the U.S. Environmental.

Protection Agency (U.S. EPA 1974). Lea represents the sound energy averaged over a 24-hour period; the day-night sound level (Ldn) represents the Lea with a 10 dB nighttime penalty. Ldn may be calculated from ddytime (a 15-hour period from 7:00 a.m. to 10:00 p.m.) and nighttime (a 9-hour period from 10:00 p.m. to 7:00 a.m.) Leq levels using the following relationship:

[ (9+ 10 .1)d Ldn = 10 log .-1 15 10 10) 10o J Ldn2 [1m 2.7-1 Byron ER-OLS where: Ld = Leq for daytime and Ln =Leq for nighttime.

2.7.3 Applicable

Guidelines 2.7.3.1 Illinois Environmental Protection Agency Maximum allowable levels of environmental noise due to the Byron Station are established by "State of Illinois Noise Pollution Control Regulations," Effective August 9, 1973, published by the Illinois EPA. This document identifies allowable levels based on the land use category of the emitter and the receiver.

Noise emitted by the Byron Station (land use Class C) to residential areas (land use Class A) is limited by Rule 202 (Sound Emitted to Class A Land During Daytime Hours, 7:00 a.m. to 10:00 p.m.) and Rule 203 (Sound Emitted to Class A Land During Nighttime Hours, 10:00 p.m. to 7:00 a.m.). Maximum allowable octave band sound pressure levels of the more stringent Rule 203 are shown in Table 2.7-1. This table also includes noise data measured at the village limits of Byron and Oregon.2.7.3.2 U.S. Environmental Protection Agency The U.S. EPA has also identified a 25-hour Leq S70 dB as the level of environmental noise that will prevent any measurable hearing loss over a lifetime for all areas (U.S. EPA 1974).Similarly, undue interference with activity and annoyance will not occur if outdoor levels in residential areas are maintained at Ldn 555 dB. Table 2.7-2 tabulates the Ld, Ln, and Ldn dB levels at the two village limits on the side towards the Byron Station.2.7.3.3 Department of Housing and Urban Development On August 4, 1974, HUD published "Noise Abatement and Control Standards," BUD Circular 1390.2 (1971) to encourage land utilization patterns for housing and other municipal needs. HUD criteria state that noise levels for residential developments are normally acceptable if they do not exceed 65 dBA more than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; i.e., L 3 3.3565 is normally acceptable.

Cumulative distributions of measured A-weighted ambient noise levels are shown in Figures 2.7-2 and 2.7-3. L 3 3.3 values may be obtained from these figures and are shown on Table 2.7-3.2.7-2 TABLE 2.7-1 ILLINOIS EPA MAXIMUMS AND MEASURED OCTAVE BAND NOISE LEVELS OCTAVE BAND CENTER FREQUENCIES

-SOUND PRESSURE LEVELS IN dB 31.5 63 125 250 500 1k 2k 4k 8k EPA Maximums (Rule 203) 69 67 62 54 47 41 36 32 32 Community Ambient Noise Levels Byron Oregon 42 40 37 46 47 50 27 36 30 34 24 33 20 22 21 19 13 12 NJ Lii TABLE 2.7-2 U.S. EPA MAXIMUMS AND MEASURED Lan LEVELS Lea LEVELS (dBA)COMMUNITY AMBIENT NOISE LEVELS (locations)

Byron U.S. EPA GUIDELINE (maximum Ldly)MEASURED LEVELS Ld n L4_.44 43 36 52 50 43 55 55 Oregon-J"I 16 TABLE 2.7-3 HUD MAXIMUMS AND MEASURED L33.3 LEVELS COMMUNITY AMBIENT NOISE LEVELS (locations)

HUD GUIDELINE (maximum)L33.3 LEVELS (dBA)MEASURED AMBIENT NOISE LEVELS DAY NIGHT Byron Oregon 65 65 43 47 36 40-.(I LEAF RIVER\I mPLANT LEY DAVIS JUNCTION MT. MORRIS I/e H4OLCOMB PAY4ES IPOINT 00 KINGS SVILLE e CHANA ft 0ii#ELAGG CENTER 0 5 0 5SIMS SCA LE BYRON NUCLEAR GENERATING STATION UNITS I & 2 ENVIRONMENTAL REPORT- OPERATING LICENSE STAGE FIGURE 2.7-1 LOCATIONS OF COMMUNITIES WITHIN 5 MILES OF THE STATION USED IN AMBIENT NOISE MEASUREMENTS 70 " 0 ccJ 0 0 co 60°50 40 30* ** 0000 ... j....i .................

..............

20]I I I I I I 0.1 1 2 5 10 20 25 30 35 40 4'5 50 60 70 80 90 9 SAMPLE TIME (%).........-.-

Byron Oregon BYRON NUCLEAR GENERATING STATION UNITS 1 & 2 ENVIRONMENTAL REPORT -OPERATING LICENSE STAGE FIGURE 2.7-2 CUMULATIVE A-WEIGHTED DAYTIME AMBIENT NOISE LEVELS 70 a: 0 m cmJ 0 0 60-50 40-30... .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..20 S I I I 0.1 A 2 I I I I I I I I I I I u I I 5 10 20 25 30 35 40 45 50 60 70 80 90 99 I SAMPLE TIME (%)..............--

,. Byron Oregon BYRON NUCLEAR GENERATING STATION UNITS 1 & 2 ENVIRONMENTAL REPORT- OPERATING LICENSE STAGE FIGURE 2.7-3 CUMULATIVE A-WEIGHTED NIGHTTIME AMBIENT NOISE LEVELS Byron Environmental Audit -Request for Additional Information Response Question #: Met-10 Category:

Meteorology, Air Quality and Noise Statement of Question: Provide information about any noise complaints for the most recent five years resulting from plant operation.

Response: No records or anecdotal reports of noise complaints caused by plant operation during the most recent five years were found.List Attachments Provided: None Byron Environmental Audit -Request forAdditional Information Response Question #: Met-11 Category:

Meteorology, Air Quality and Noise Statement of Question: Identify primary noise sources at Byron and in the vicinity of Byron. Please identify if the noise sources are located outdoors or in enclosures.

Response: Section 5.6 in the Byron ER-OLS (ComEd 1981 b) describes predicted noise effects from operation of the Byron Station. Based on experience, the noise sources (equipment) attributed to continuous plant operation in section 5.6 were the following:

  • System auxiliary transformers
  • Unit auxiliary transformers
  • Screen-house transformers
  • Auxiliary building ventilation supply and exhaust fans* Screen-house ventilation supply fans Operation of unsilenced main-steam power-operated relief valves was identified as an intermittent noise source. A copy of section 5.6 in the Byron ER-OLS is attached.Other noise sources not addressed in the Byron ER-OLS include the circulating water system pumps and the Security Firing Range. The circulating water system pumps contribute noise to continuous plant operation while the Security Firing Range has been identified as a possible intermittent noise source. Noise levels from neither of these sources have been assessed.The noise sources mentioned above are located outdoors with no enclosures, except the circulating water system pumps, the auxiliary building ventilation supply and exhaust fans, and the screen-house ventilation supply fans, which are all located in buildings.

List Attachments Provided: Byron ER-OLS, Section 5.6 Byron ER-OLS 5.6 OTHER EFFECTS 5.6.1 Introduction This section describes the predicted noise effects of the Byron Nuclear Generating Station -Units 1 & 2 (Byron Station) during plant operation.

All other effects of operation are discussed in other sections of Chapter 5.5.6.2 Approach Noise due to the operation of Byron Station was predicted at four locations identified in Figure 5.6-1 as Points 1 through 4.Points 1 through 3 were selected because plant operation noise at these points will be relative maximums for offsite residential areas. Point 4 was selected to assess maximum offsite noise due to operation of the river screen house.The noise sources (equipment) considered in predicting continuous plant operation noise were the natural-draft cooling towers, essential-service-water mechanical-draft cooling towers, main power transformers, system auxiliary transformers, unit auxiliary transformers, screen-house transformers, auxiliary building ventilation supply and exhaust fans, and screen-house ventilation supply fans. Experience shows that these are the major sources of continuous exterior noise for this type of station.Intermittent noise due to the operation of unsilenced main-steam power-operated relief valves was also predicted.

5.6.3 Procedures

Maximum expected noise level data for the major exterior sources identified in Subsection 5.6.2 were established based on published prediction schemes and manufacturers' information.

Natural-draft cooling tower noise levels were based on a prediction technique by G. A. Capano and W. E. Bradley (1974).Noise data for essential-service-water mechanical-draft cooling towers and for transformers were obtained from the manufacturers.

The National Electrical Manufacturers Association's Standards for Transformers, TR1-1972, Section 0..06 (1972) was also used to establish transformer noise levels. Ventilation-fan noise level predictions were based on a prediction technique by J. B. Graham (1975), and used fan operation parameters obtained from station design requirements.

Power-operated relief valve noise was predicted using a technique developed by Riley-Beaird (no date).The noise levels for each source were extrapolated to the various prediction points using standard prediction techniques that account for wave divergence and excess attenuation due to atmospheric absorption, directivity, shielding, and ground effects. The resulting octave-band sound pressure levels from each continuous source were then combined to give the resultant overall plant operation noise level at each location.

Table 5.6-1 summarizes these predicted levels. Table 5.6-2 summarizes 5.6-1 Byron ER-OLS AMENDMENT NO. 1 JULY 1981 the predicted A-weighted noise levels at. each prediction point that result from relief valve operation.

5.6.4 Noise

Effects 5.6.4.1 Illinois Environmental Protection Agency To assess the possible effects of noise due to normal continuous operation of Byron Station, the predicted levels were compared to applicable state of Illinois noise pollution control regulations.

Since the prediction points are located near existing residences, station noise at these points is regulated by Rule 203 (Sound Emitted to Class-A Land During Nighttime Hours). The comparisons of predicted levels with Rule 203, as shown in Figures 5.6-2 through 5.6-5, indicate that the calculated station operation noise levels at all prediction points meet the Illinois regulations.

5.6.4.2 U.S. Environmental Protection Agency A second method used to assess the possible effects of normal operation of Byron Station was to determine how the predicted plant operation noise levels Compared with the levels of environmental noise identified by the U.S. Environmental Protection Agency (USEPA) as requisite to protect public health with an adequate margin of safety. This comparison, summarized in Table 5.6-3, shows that predicted levels at all points meet the requisite level, Ldn : 55, applicable to outdoor levels in residential areas.5.6.4.3 Department of Housing and Urban Development A comparison of predicted noise due to normal plant operation with the Department of Housing and Urban Development (HUD)criteria described in Subsection 2.7.3.3 (L 3 3 35 65 dBA) is shown in Table 5.6-4. This comparison shows that piedicted levels at all points met the HUD criteria.5.6.4.4 Preoperational Ambient Levels To permit comparison of predicted plant operation noise with pre-operational ambient noise at the plant site, levels measured at nearby locations were used to estimate preoperational ambient noise at prediction points 1, 2, and 3. These estimated levels and the measured levels at Point 4 are shown on Tables 5.6-3 and 5.6-4. These tables indicate that although levels at points near the Byron Station property line will be increased due to station operation, the predicted levels are below all applicable regulations and guidelines.

Ambient noise levels measured in the nearest communities, Byron and Oregon (see Subsection 2.7.1), however, are not expected to be significantly affected by plant operation.

5.6-2 Byron ER-OLS 5.6.5 Conclusion The predicted station operation noise levels at property line points near existing residences meet state of Illinois regulations and federal guidelines for noise emitted to residential receivers.

The actual station operation noise levels are expected to be lower than those presented in this Environmental Report because all predictions were based on the maximum expected equipment noise. The noise impact due tc normal operation of the Byron Station is therefore expected to be small.5.6-3 Byron ER-OLS TABLE 5.6-1 PREDICTED NOISE LEVELS DUE TO NORMAL CONTINUOUS OPERATION LOCATION 1 2 3 4 dBA 42 47 48 29 63 49 51 53 29 OCTAVE ITT 53 56 59 37 BAND CENTER FREQUENCIES (Hz)250 500 1K 2K 45 40 35 19 49 44 41 30 52 46 39 28 32 29 16 14 4K .8K 2 --20 3 10 --8 --5.6-4 Byron ER-OLS TABLE 5.6-2 PREDICTED NOISE LEVELS DUE TO RELIEF VALVES OPERATION LOCATION 1 SOUND LEVEL (dBA)77 2 3 4 83 86 53 5.6-5 Byron ER-OLS AMENDMENT NO. 3 MARCH 1982 TABLE 5.6-3 COMPARISON OF PREOPERATIONAL AND PLANT-OPERATIONAL CONTINUOUS NOISE LEVELS WITH U.S. EPA GUIDELINES LOCATION 1 2 3 4 PREOPERATIONAL NOISE LEVEL Ldf= 45 Ldn = 45 Ldn = 54 Ldn = 56 NOISE DUE TO PLANT OPERATION (Predicted Level)Ldn = 48 Ldn = 53 Ldn = 54 Ldn = 35 U.S. EPA GUIDELINE Ldn < 55 Ldn E 55 Ldn 55 13 Ldn < 55 Source: U.S. Environmental Protection Agency (U.S. EPA 1974).aThe Ldn or day-night sound level represents the Leq with a 10 dB nighttime penalty (see Subsection 2.7.2).5.6-6 Byron ER-OLS AMENDMENT NO. 3 MARCH 1982 TABLE 5.6-4 COMPARISON OF PREOPERATIONAL AND PLANT-OPERATIONAL CONTINUOUS NOISE LEVELS WITH HUD GUIDELINES LOCATION 1 2 3 4 PREOPERATIONAL NOISE LEVEL (L 3 3 3a)DAY NIGHT 38.2 35.5 38.2 35.5 46.5 47.8 47.5 41.7 NOISE DUE TO PLANT OPERATION.(Predicted Level)L33.3 = 42 L33.3 = 47 L33.3 = 48 L33.3 = 29 HUD GUIDELINE L33.3 < 65 L33.3 < 65 L33.3 .65 13 L33.3 < 65 Source: Department of Housing and Urban Development (HUD 1971).aThe L 3 3.3 is the maximum noise level for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (see Subsection 2.7.3.3).5.6-7 AMENDMENT NO. 3 AMENDMENT NO. 1 MARCH 1982 JULY 1981 S 0 0 Natural Draft*" Cooling' Towers::::::~ Ij V Ebenezer Church Draft Cooling Tower :,.'II N, House izurvIlme no.River Screen House U....................

Site Boundary Q Noise Prediction Location 31RON NUCLEAR GENERATING STATION UNITS 1 & 2 ENVIRONMENTAL REPORT -OPERATING LICENSE STAGE FIGURE 5.6-1 NOISE PREDICTION LOCATIONS 3000 0 3000 SCALE IN FEET LIU w> CCn 60-Soo z .0:2 0 40-O O z 10< *0 30 z U --I-o 20 0 10-0-31.5 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND CENTER FREQUENCIES IN HZ I cps 0YRON NUCLEAR GENERATING STATII PREDICTED NOISE LEVELS UNITS 1 & 2 ENVIRONMENTAL REPORT -OPERATING LICENSE ILLINOIS RULE 203 FIGURE 5.6-2 IN STAGE NOISE LEVELS AT POINT 1 70--j.w w.ic-J 0 (a w I-I.z 0 0 z 4C 0 cc w 4 I-U 0 N N C-4: 0 m 0 0 0 0 w z 60-50-40-30-20 10-no.-u S S S S I I 31.5 63 OCTAVE a 125 BAND 250 500 1000 2000 4000 8000 CENTER FREQUENCIES IN HZ ( cps )PREDICTED NOISE LEVELS ILLINOIS RULE 203 BYRON NUCLEAR GENERATING STATION UNITS I & 2 ENVIRONMENTAL REPORT -OPERATING LICENSE STAGE FIGURE 5.6-3 NOISE LEVELS AT POINT 2 7"- 60-In-J m LIn 0o 50-co in°-IL 4 0 0 3 0 Z0 0 O: 30 0 z 03 Co PREICE NOS 20ESU17 0 10, 31.5 63 125 250 500 1000 2000 4000 6000 OCTAVE BAND CENTER FREQUENCIES IN HZ ( cps )DYRON NUCLEAR G.ENERATING STATII PREDICTED NOISE LEVELS UNITS 1 & 2 ENVIRONMENTAL REPORT -OPERATING LICENSE ILLINOIS RULE 203 FIGIUI 5 6-4 0N STAGE NOISE LEVELS AT POINT 3

-j 70" Iu-j w ' 6 ixi cc 50 N 000 zN 0 40-zo 0 w 404.0 Z 0 -S"oU O 30 Z Lu-3-o 20 0, 10-31.5 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND CENTER FREQUENCIES IN HZ (cps)BYRON NUCLEAR GENERATING STAT PREDICTED NOISE LEVELS UNITS I & 2 ENVIRONMENTAL REPORT- OPERATING LICENSE ILLINOIS RULE 203 'TnOC C C C ION STAGE NOIS LELS JA. u-J NOISE LEVELS AT POINT 4 Byron Environmental Audit -Request for Additional Information Response Question #: Met-12 Category: Meteorology, Air Quality and Noise Statement of Question: Identify nearby noise-sensitive receptors (e.g., residences, school, nursing home, childcare facility).

Response: Land use surveys are conducted annually in the vicinity of Byron Station and reported in the Annual Radiological Environmental Operating Report, in accordance with the Byron Station Offsite Dose Calculation Manual. Among other things, the surveys document the nearest residence in each of the sixteen 22.5-degree sectors around the site. In 2012, residences were reported at the distances from Byron Station listed below.Distance in Miles from Byron Station Vent Stacks Sector Distance to Nearest Sector Distance to Nearest Residence Residence N 1.2 S 0.6 NNE 1.6 SSW 0.7 NE 1.1 SW 0.8 ENE 1.0 WSW 1.6 E 1.2 W 1.8 ESE 1.5 WNW 1.6 SE 1.7 NW 0.9 SSE 0.7 NNW 0.9 No other noise-sensitive receptors are known to be located within 2 miles of Byron Station.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: Met-13 Category:

Meteorology, Air Quality and Noise Statement of Question: Provide the staff interview Form New and Significant Information Identification Process (issue and discussion:

58. "Noise," page 81 of 149) reviewed during the environmental audit conducted in September 2013. Clarify the timeline/dates the noise complaints that are mentioned in the Interview Form were raised and measures taken as a result of the complaints.

Response: Copies of the three staff interview forms concerning issue #58, "Noise," that were created during Exelon Generation's New and Significant Information Identification Process are attached to this response.

Two of the three interviewees recalled hearing that complaints had been received about noise at the river screen house and noise due to night shooting at the on-site Security Firing Range.In follow-up discussions with the interviewees, it has been determined that the recollected complaints all occurred more than 10 years ago, and no more recent noise complaints have been received.

The interviewees could not clarify the timing of river screen house complaints, and do not recall implementation of any noise abatement measures resulting from those complaints.

The noise complaints about night shooting at the on-site Security Firing Range occurred during the first year of Firing Range use (circa 2002). Those complaints were addressed upon receipt by rearranging the Security Force training schedule to conduct night shooting exercises, which are necessary to comply with the company's NRC-approved training and qualification plan for security personnel, at less objectionable times.List Attachments Provided: Byron Station Units 1 and 2 Application for Renewed Operating Licenses Environmental Supplemental Report, Volume II, New and Significant Information Report, Staff Interview Form, New and Significant Information Identification Process, Issue and Discussion:

58.Noise (pages 80 of 150 to 82 of 150)

Staff Interview Form New and Significant Information Identification Process Issue and Discussion:

58. Noise Category:

1 A. Interviewee Identification:

Name: Zoe Cox Organization:

Byron Generating Station -Supervisor Environmental/Radwaste Responsibilities:

NPDES; Air; Drinking Water; Sewage Treatment/Wastewater Telephone:

(815) 406-3035 Education:

Bachelor of Science in Chemistry Years Experience:

Here: 16 Other: 5 B. Issue-Specific Questions i. Has this particular issue been of concern at this plant (if "yes" please explain?)

Yes ii. How would you characterize the environmental impact associated with this issue at this plant?SMALL iii. NRC characterized the environmental impact associated with this issue as SMALL Do you agree with the NRC findings for this issue (if "no," please explain)?

Yes iv. Basis for response: Neighbors complained about security personnel using shooting range at night. As a result, shooting at night was discontinued.

There have also been a few complaints about the noise made by ventilation fans at the river screenhouse, but nothing major.v. Additional comments: Never been any complaints about the PA system, which they try to use sparingly.

C. General Questions i. Are you aware of any activities or planned activities in the plant area that might have environmental impacts that are similar to, and so cumulative with, plant environmental impacts (if "yes" please explain)?

No ii. Are you familiar with the 92 environmental issues that NRC identified as associated with license renewal? Yes If so, are you aware of any issues that NRC overlooked or findings that are incorrect as applied to this plant (if "yes" please explain)?

No iii. Have any regulatory agencies or members of the public or public interest groups that you are aware of expressed concern about current or renewed plant operations (if "yes" please explain)?

No D. Interview Identification Interviewer:

Phil Moore Interview Date: 10/18/11 Other Attendees:

Krista Dearing Nancy Ranek Kristi Hagood Rob Tarr Interview Location:

Byron NGS Page 80 of 150 Staff Interview Form New and Significant Information Identification Process Issue and Discussion:

58. Noise Category:

1 A. Interviewee Identification:

Name: Paul Dempsey Organization:

Communications Manager -Byron Responsibilities:

internal and external communications Telephone:

(815) 406-3554 Education:

BA journalism, Eastern Illinois University Years Experience:

Here: 2 Other: 8 B. Issue-Specific Questions i. Has this particular issue been of concern at this plant (if "yes" please explain?)

No ii. How would you characterize the environmental impact associated with this issue at this plant?SMALL iii. NRC characterized the environmental impact associated with this issue as SMALL Do you agree with the NRC findings for this issue (if "no," please explain)?

Yes iv. Basis for response: Not aware of any issues with the plant.v. Additional comments: C. General Questions i. Are you aware of any activities or planned activities in the plant area that might have environmental impacts that are similar to, and so cumulative with, plant environmental impacts (if "yes" please explain)?

No ii. Are you familiar with the 92 environmental issues that NRC identified as associated with license renewal? Yes If so, are you aware of any issues that NRC overlooked or findings that are incorrect as applied to this plant (if "yes" please explain)?

No iii. Have any regulatory agencies or members of the public or public interest groups that you are aware of expressed concern about current or renewed plant operations (if "yes" please explain)?

No D. Interview Identification Interviewer:

Kristi Hagood Other Attendees:

Krista Dearing Nancy Ranek Phil Moore Rob Tarr Interview Date: 10/19/11 Interview Location:

Byron NGS Page 81 of 150 Staff Interview Form New and Significant Information Identification Process Issue and Discussion:

58. Noise Category:

1 A. Interviewee Identification:

Name: John Petro Organization:

Exelon Generation

-Principal Environmental Specialist Responsibilities:

NPDES and other water permits, wildlife Telephone:

(630) 657-3209 Education:

Bachelor of Science, Biology from Illinois Benedictine College Years Experience:

Here: 37 Other: 2 B. Issue-Specific Questions i. Has this particular issue been of concern at this plant (if "yes" please explain?)

No ii. How would you characterize the environmental impact associated with this issue at this plant?SMALL iii. NRC characterized the environmental impact associated with this issue as SMALL Do you agree with the NRC findings for this issue (if "no," please explain)?

Yes iv. Basis for response: There have been a few noise issues at the river screenhouse but nothing significant.

There were also some issues at the gun range due to night shooting but the hours were changed.v. Additional comments: C. General Questions i. Are you aware of any activities or planned activities in the plant area that might have environmental impacts that are similar to, and so cumulative with, plant environmental impacts (if "yes" please explain)?

No ii. Are you familiar with the 92 environmental issues that NRC identified as associated with license renewal? Yes If so, are you aware of any issues that NRC overlooked or findings that are incorrect as applied to this plant (if "yes" please explain)?

No iii. Have any regulatory agencies or members of the public or public interest groups that you are aware of expressed concern about current or renewed plant operations (if "yes" please explain)?

No D. Interview Identification Interviewer:

Phil Moore Interview Date: 10/18/11 Other Attendees:

Rob Tarr Krista Dearing Kristi Hagood Nancy Ranek Interview Location:

Byron NGS Page 82 of 150 Byron Environmental Audit -Request for Additional Information Response Question #: Met-14a Category:

Meteorology, Air Quality and Noise Statement of Question: In support of NRC's greenhouse gas, climate change, and cumulative impacts analysis,address the following:

a. Has an atmospheric warming trend been observed in Rock River Hill County [sic] during the period of plant operations?

Provide available data to support the conclusions reached (e.g., mean daily maximum annual temperatures, mean daily minimum annual temperatures, or mean annual temperature for the available period of record from Byron's meteorological station).Response: A table listing average monthly temperatures measured at the Byron Station Meteorological Tower (30-ft elevation) for the period from June 1973 through November 2013 is attached.Based on assessments using cumulative moving average and simple moving median calculations, a slight upward trend in annual average temperature at the Byron Station Meteorological Tower was observable for this data set. However, Exelon Generation cannot conclude from these observations, which represent only one location, whether any atmospheric warming trend has been observed in the Rock River Hill Country region.List of Attachments Provided: Byron Station Meteorological Tower -Average Monthly Temperatures, 30' Elevation.

June 1973 through November 2013.

Byron Station Meteorological Tower -Average Monthly Temperatures 30' Elevation (OF)\.Month h JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC AVG 1973 * *

  • 68.6 68.1 67.1 58.6 54.9 38.4 22.9 **1974 20.7 24.5 35.1 50.0 56.0 63.7 72.0 66.6 56.9 49.3 37.7 28.4 46.7 1975 25.1 23.7 28.4 41.1 61.8 69.9 73.3 72.6 59.8 54.7 44.2 30.1 48.7 1976 18.2 33.1 41.1 51.5 57.7 70.0 73.4 68.1 60.1 45.4 29.2 16.2 47.0 1977 6.3 24.5 42.0 55.4 67.7 67.1 74.1 68.7 62.6 49.0 36.9 20.5 47.9 1978 12.5 15.7 31.7 48.4 59.2 69.8 71.7 71.0 67.9 50.4 37.9 21.3 46.5 1979 6.8 12.4 34.4 45.7 60.6 69.7 71.2 69.0 65.1 52.8 37.0 30.3 46.3 1980 20.3 19.0 30.8 46.7 61.2 66.9 74.4 71.8 63.3 46.8 38.2 25.2 47.1 1981 21.7 26.0 37.6 51.3 56.4 69.1 71.1 69.0 61.2 49.0 40.3 24.7 48.1 1982 9.8 21.3 32.8 43.8 64.9 64.0 72.8 68.4 61.7 53.5 38.0 33.3 47.0 1983 25.0 30.4 36.8 44.0 55.1 70.6 76.6 75.6 63.6 52.4 40.4 13.4 48.7 1984 18.0 32.9 29.3 46.7 56.7 70.8 70.5 72.4 61.4 54.4 38.1 29.7 48.4 1985 13.3 20.4 39.1 53.7 62.9 66.1 71.5 67.4 63.3 52.2 34.9 14.6 46.6 1986 22.3 21.6 39.9 52.1 60.4 67.9 73.8 66.3 64.1 51.7 33.5 28.2 48.5 1987 24.0 32.5 38.7 51.5 63.7 71.7 74.1 69.3 62.3 45.5 42.0 29.8 50.4 1988 16.8 20.1 36.7 48.4 64.1 72.5 76.6 75.6 65.4 45.6 39.1 26.5 49.0 1989 30.2 16.4 33.9 47.1 58.6 67.9 73.2 69.4 60.7 52.9 35.8 14.7 46.7 1990 31.9 29.0 39.8 48.8 56.1 69.3 70.5 70.0 64.3 50.4 43.1 24.4 49.8 1991 17.2 29.4 38.7 51.9 65.1 72.4 73.0 71.8 62.1 51.0 32.7 28.2 49.5 1992 26.3 31.6 37.0 45.3 59.9 66.1 66.8 64.6 60.7 49.8 35.3 26.0 47.5 1993 23.5 22.5 32.9 45.3 60.2 66.3 71.9 70.6 57.3 49.5 36.6 27.1 47.0 1994 12.6 19.3 36.8 49.8 59.9 70.1 69.7 66.5 63.7 52.9 41.6 31.2 47.8 1995 20.3 23.7 38.0 44.1 57.3 70.6 73.8 74.9 59.9 51.3 30.5 23.7 47.3 1996 18.8 23.8 29.8 45.1 54.9 67.9 68.3 69.7 60.8 51.3 31.1 24.5 45.5 1997 16.5 27.1 37.0 44.8 53.9 69.3 71.0 67.2 62.5 52.6 34.9 28.7 47.1 1998 26.8 36.4 38.3 49.5 64.9 68.0 72.2 71.7 67.0 53.4 42.6 32.5 51.9 1999 19.3 33.4 35.7 50.3 62.1 69.1 76.3 68.2 61.8 51.6 44.9 28.0 50.1 Page 1 of 2 Byron Station Meteorological Tower -Average Monthly Temperatures 30' Elevation (OF)\Month h JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC AVG 2000 22.6 33.1 43.7 48.1 61.9 66.8 69.9 70.8 63.1 55.7 36.2 13.9 48.8 2001 23.4 23.1 33.2 53.5 61.4 68.2 74.0 71.7 60.7 50.8 48.5 32.4 50.1 2002 30.6 31.4 33.1 49.1 55.9 71.3 75.5 71.4 66.9 48.0 36.6 30.0 50.0 2003 19.6 22.2 36.2 49.5 57.3 66.9 71.7 72.8 62.8 52.3 40.1 30.6 48.5 2004 18.7 27.3 40.8 51.6 60.8 67.7 69.8 66.0 66.2 52.7 41.8 27.6 49.3 2005 21.7 31.6 35.1 53.2 57.6 73.8 73.9 72.2 68.1 53.6 40.9 21.2 50.2 2006 34.1 26.7 37.0 53.5 59.7 68.0 74.9 71.5 60.6 48.1 41.8 32.2 50.7 2007 25.9 15.8 42.2 46.9 64.5 69.4 70.6 71.9 66.1 57.7 38.3 24.5 49.5 2008 21.0 19.9 32.7 48.6 57.0 69.5 71.5 68.8 63.8 50.8 37.8 19.6 46.8 2009 13.5 26.2 38.1 47.8 59.6 68.0 66.2 67.2 62.5 46.6 44.2 24.3 47.0 2010 17.7 24.2 41.2 55.0 61.4 69.8 74.2 73.3 63.2 54.6 40.1 19.7 49.5 2011 18.2 24.8 35.4 47.1 59.4 69.8 76.5 71.0 59.4 53.3 41.7 32.5 49.1 2012 27.5 30.1 51.8 49.4 64.9 71.9 78.2 70.6 61.8 49.1 39.0 32.6 52.2 2013 24.3 23.9 29.2 45.3 61.6 67.8 71.1 70.5 64.7 51.6 35.5 * **AVG 20.6 25.3 36.6 48.8 60.1 68.9 72.4 70.1 62.6 51.2 38.5 25.6 48.4 Source: IvIontniy Reports on the Meveorological Moivmoring Program at 2013. Prepared for Exelon Nuclear by Murray and Trettel, Inc.me Byron N'uclear Generating Station, June 1 9 /3 o NovemDer No monthiy data report available** Annual Average not calculated due to incomplete data set for the year Page 2 of 2 Byron Environmental Audit -Request for Additional Information Response Question #: Met-14b Category:

Meteorology, Air Quality and Noise Statement of Question: In support of NRC's greenhouse gas, climate change, and cumulative impacts analysis, please address the following:

b) Has a river warming trend been observed in the Rock River during the period of plant operations?

Provide any study(ies) or data that support the conclusions reached (e.g., mean annual, seasonal, and/or or monthly water temperature trend for the period of record).Response: Rock River intake temperatures at the river screen house are not readily transferable from plant operating logs. However, a recent review of circulating water system performance generated a graph of make-up water (Rock River)temperatures for the most recent 10 years, beginning in December 2003 and ending in December 2013 (see Figure 1 below). On Figure 1, the horizontal axis represents time, and the vertical axis is temperature in degrees Fahrenheit from 0 to 100 0 F. No warming trend is discernible from the graph during the 10-year time period displayed.

The nearest USGS gaging station (05440700) on the Rock River with temperature data is at Byron, IL, approximately 8 km (5 mi) upstream of the Byron intake. The following table identifies the temperature data collected by the U.S. Geologic Survey at that gaging station.Byron, Illinois, Gaging Station (USGS 05440700)Type of data Time period Notes Water July 4, 2012 to Measurement taken every 15 minutes Temperature present Field/Lab water October 1977 to quality samples, present, but not Monthly from Oct 1977 to April 1997;including water continuous Nov 2008 to present temperature Nov 200I toIpresent The USGS also maintains a gaging station (05443500) at Como, IL, approximately 74 km (46 miles) downstream of the Byron discharge.

The following table identifies the temperature data collected by the U.S. Geologic Survey at that gaging station.Como, Illinois, Gaging Station (USGS 05443500)Type of data Time period Notes Field/Lab water October 1977 to quality samples, present, but not Monthly from Oct 1977 to April 1997;including water continuous Nov 2008 to present temperature Nov I 008 toIpresent Page 1 of 3 Because there is no continuous data record at either USGS gaging station and because the collection methodologies at both stations varied over time and typically consisted of one water temperature taken monthly in conjunction with the collection of water quality samples, the USGS data cannot be used to perform a trend analysis.List Attachments Provided: None Page 2 of 3 Figure 1: Circulating Water Make-up Temperatures (OF) -.cember 2003 to December 2013 Page 3 of 3 Byron Environmental Audit -Request for Additional Information Response Question #: R-1 Category:

Refurbishment Statement of Question: Chapter 3 of the ER states that Exelon has no plans for refurbishment or replacement activities at Byron and hypothetically assumes that replacement of the Unit 2 steam generators may occur prior to the end of the 40-year initial license term (page 3-18 of the ER). However, for the air quality refurbishment issue presented in Chapter 4, Exelon assumes that replacement of the Unit 2 steam generators may occur "during the license renewal term" (page 4-26 of the ER). Please clarify the expected timeframe (year) that the Unit 2 steam generator replacement would occur and whether this hypothetical activity should be considered refurbishment.

Will steam generator replacement occur prior to the end of the current license or during the period of extended operation?

Response: It is not possible to clarify the expected year in which the hypothesized Unit 2 steam generator replacement would occur. Exelon Generation chose to assess in the Byron License Renewal Environmental Report impacts of possible steam generator replacement because the decision to replace the Unit 2 steam generator will ultimately depend on the success of mitigation measures and monitoring intended to address"degradation mechanisms" (i.e., aging). The link between the potential steam generator replacement and plant aging mechanisms, in conjunction with the possibility that the potential replacement might be needed at a time roughly coincident with the end of the current licensed term for Byron suggested that an analysis of the replacement activity as hypothetical refurbishment would be prudent.List Attachments Provided: None Byron Environmental Audit -Response to Request for Additional Information Question #: R-2 Category:

Refurbishment Statement of Question: In support of NRC's analysis of the impacts of Unit 2 steam generator replacement, please address the following questions:

a. How many temporary or permanent buildings will be constructed to support steam generator replacement activities?
b. What is the estimated footprint (ft) of new buildings to be constructed?

What is the estimated depth of excavation?

Response: a.) The only building likely to be constructed to support steam generator replacement activities is the storage building for the old steam generators.

Temporary office trailers and temporary shelters may be located near the construction site.b.) The estimated footprint (ft 2) of the new steam generator storage building would be approximately 7,000 ft 2.The footings will extend about 4 ft beyond the building walls making the footprint of the structure approximately 8,500 ft2. The building would also have an entrance vestibule that occupies approximately 200 W.The estimated depth of the excavation would be approximately 4 ft.The old steam generator facility building plan drawing for the Byron Unit 1 old steam generators is attached to this response as an example.List Attachments Provided: CoinEd Byron Drawing S-2683, Sheet Number 1, Old Steam Generator Storage Facility

Byron Environmental Audit -Request for Additional Information Response Question #: S-1 Category: Socioeconomics Statement of Question: Provide updated permanent workforce data, preferably a residential distribution of permanent workforce by county in Table format.Response: The table below provides an updated distribution of permanent workforce by county in Illinois.County Permanent Workforce Boone 11 Bureau 1 Carroll 2 Cook 5 DeKalb 25 DuPage 4 Fayette 1 Grundy 1 Jackson 3 Kane 13 Kendall 3 Lake 1 LaSalle 4 Lee 115 McHenry 9 Ogle 352 Pike 1 Rock 1 Stephenson 10 Tazewell 1 Whiteside 52 Will 3 Winnebago 243 Counties not in Illinois 6 Total 867 List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: S-2 Category: Socioeconomics Statement of Question: Provide updated property tax information, similar to the data provided in Tables 2.7-2 and 2.7-3 of the ER. Include data for the years 2011 and 2012, if available.

Response: Data provided below were collected from Ogle County. Note that the Ogle County Treasurer indicates that the 2012 data are preliminary and that the total levies for any one of the taxing bodies within Ogle County may change until December 2013 when the tax year closes.Table S-2.1 Property Tax Payment Comparison, All Taxing Districts Combined for 2011 and 2012 Total Combined Byron Station Byron Station Year Taxing District Levy Property Tax Payment as Percent-Ogle County ($) Payment ($) of Total District Levy____ ___ ___ ____ ___ ___ (%)2011 113,872,426.83 30,762,852.80 27 2012 116,641,832.35 32,990,082.32 28 Table S-2.2 Property Tax Payment Comparison, Byron Unit 226 School District Byron Unit 226 Byron Station Total Byron Unit 226 District Portion of Payment as Percent School District Levy Byron Station of Byron Unit 226 Year ($) Property Tax School District Levy Payment ($) (%)2011 23,175,260.74 17,219,124.59 74.2 2012 24,531,412.11 18,540,024.03 75.6 List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: S-3 Category:

Socioeconomics Statement of Question: Byron's last settlement agreement was signed on November 8, 2008 and covered tax years 2005 through 2011. What is the status of the latest settlement agreement for current and future tax years? Please provide any relevant information.

Response: Exelon Generation and the taxing bodies have not entered into another settlement agreement, although negotiations have begun. The Ogle County Assessor set the equalized assessed value (EAV) for the 2012 tax year at $499 million, which is more than 4% higher than the EAV set under the existing settlement agreement.

Exelon Generation believes the higher EAV overvalues Byron Station because an independent appraiser set the 2012 value of the station at$1.85 billion, which equates to an EAV of approximately

$296.9 million. On this basis, Exelon Generation appealed the 2012 assessment to the Ogle County Board of Review. Upon an unfavorable ruling by the Board of Review, Exelon Generation then appealed the assessment to the Illinois Property Tax Appeal Board. The company will continue to negotiate with the taxing bodies to attempt to reach a settlement agreement, and in its absence, will appeal any assessment that does not reflect a fair valuation of the plant. However, pending the outcome of such actions, Exelon Generation has paid the tax assessed for 2012 (an increase of more than$2 million over the prior year). [Note that this was the EAV set by the assessor just for the two power block Property Identification Numbers (PINs) combined, while Exelon Generation actually pays taxes on 48 parcels at the Byron Station. The total taxes paid by Exelon Generation identified in Table S-2.1 includes taxes for all of the PINs.]List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: S-4 Category:

Socioeconomics Statement of Question: In accordance with the 2008 settlement agreement, Exelon agreed to make payments in addition to taxes (PIATs) to specific tax recipients.

Under the agreement, Exelon made two PIAT payments of $2,302,000 each; one in 2008 and the other, in 2010. Will there be additional PIATs in the future? If so, will there be any changes to the list of recipients in ER Table 2.7-1?Please provide any relevant information.

Response: The negotiations with the taxing bodies that receive taxes for Byron Station are in the early stages, and Exelon Generation cannot confirm or rule out the future use of PIAT payments as part of any settlement agreement.

Exelon Generation expects the list of recipients would be the same as those listed in ER Table 2.7-1 because those are the taxing bodies that levy tax on the two power block Property Index Numbers (PINs). The settlement agreements have historically only settled the EAV for the two power block PINs.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: S-5 Category:

Socioeconomics Statement of Question: Exelon pays annual property taxes to a number of taxing entities within, and including, Ogle County. The Ogle County Treasurer collects Byron's property tax payment and disperses it to the various taxing entities to partially fund their respective operating budgets. Provide additional information about tax payments to Ogle County (after tax triggers and not including PIAT payments) and the portion of the county tax monies allocated to "the Byron Forest Preserve, the Oregon Park District, the Rock Valley Community College 511, the Byron Unit 226 School District, the Byron Fire District, the Byron Library District, Ogle County, and Rockvale Township." A brief explanation of how these payments are allocated would be helpful. A table showing the amount of distribution (or percentage) of the Byron property tax payment and each entity's total revenue (or percent of total revenue) would also be helpful. It's important to know how dependent some of these entities may be on the revenue received from the Byron property tax payment via Ogle County.Response: Exelon Generation pays taxes directly to Ogle County in accordance with tax bills received from Ogle County each year. A copy of one of those bills is attached to this response as an example.This illustrative bill shows a line entry for each of the taxing bodies that impose tax on that particular tax parcel. As the Byron Station property is large, some of the tax parcels it includes fall within multiple taxing districts.

There is no one tax parcel that is levied on by every taxing body that levies against the station, and therefore no one bill that shows all of the taxing districts that levy tax on the total property.Exelon Generation has no control over how the tax money it pays is allocated by the County to the taxing districts.

Each district has the ability to levy against all taxpayers within its respective district according to its own charter and according to state law. The current levies are noted as a percentage in the column marked "Current Rate" on the tax bill. Exelon Generation understands that the County Treasurer allocates the tax money collected to the respective taxing bodies according to their pre-determined levies once all taxes have been collected.

The tables below for 2011 and 2012 show the total levy for each taxing body that imposes a tax on some portion of the Byron Station property, and show the exact amount paid by Exelon Generation to each taxing body. The tables also show the percentage of total revenue represented by Exelon Generation's payment for each taxing body for the tax years 2011 and 2012. It should be noted that the Ogle County Treasurer indicates that the 2012 data are preliminary and that the total levies for any one of the taxing bodies within Ogle County may change until December 2013 when the tax year closes.

Table S-5.1 2011 Property Tax Payment Comparison, Each Taxing District Individually Taxing District Byron Station Total Taxing Portion of Byron Payment as District Levy Station Property Percent of Taxing Body ($) Tax Payment Taxing ($) District Levy____ ____(%)Rockvale Township Road District 439,398.38 412,078.70 94%Rockvale Township 162,893.90 147,867.78 91%Oregon Park District 2,426,968.19 1,945,577.49 80%Byron Library District 985,733.24 790,179.58 80%Byron Fire District 2,847,882.53 2,137,067.08 75%Byron Forest Preserve 2,235,104.08 1,664,691.42 75%Byron School Unit 226 23,175,260.74 17,219,124.59 74%Byron Museum District 107,847.70 80,314.40 74%Rock Valley Community College 511 3,996,316.29 2,131,800.53 53%Ogle County 10,895,856.26 3,500,490.42 32%Oregon School Unit 220 9,954,055.80 608,129.98 6%Kishwaukee College 523 2,178,105.74 70,351.06 3%Marion Township Road 280,324.97 7,001.20 2%Marion Township 202,895.79 4,815.41 2%Stillman Valley Fire District 564,747.94 6,558.42 1%Byron Park District 535,352.10 5,599.27 1%Meridian Unit 223 7,668,245.10 28,676.18 less than 1 %Julia Hull District Library 216,840.52 746.90 less than 1 %Oregon Fire District 393,225.48 511.33 less than 1 %City of Byron 680,358.62 789.59 less than 1 %Byron Township Road 531,168.42 359.68 less than 1 %Byron Township 197,888.03 121.79 less than 1 %

Table S-5.2 2012 Property Tax Payment Comparison, Each Taxing District Individually Taxing District Byron Station Total Taxing Portion of Byron Payment as District Levy Station Property Percent of Taxing Body ($) Tax Payment Taxing ($) District Levy (%)Rockvale Township Road District 473,936.19 433,301.95 91%Rockvale Township 170,402.82 155,781.07 91%Oregon Park District 2,592,707.40 2,053,432.47 79%Byron Library District 1,100,021.40 832,826.26 76%Byron Fire District 2,849,570.86 2,173,799.08 76%Byron Forest Preserve 2,723,877.90 2,063,496.61 76%Byron School Unit 226 24,531,412.11 18,540,024.03 76%Byron Museum District 107,904.13 81,743.99 76%Rock Valley Community College 511 3,983,228.58 2,186,116.75 55%Ogle County 11,050,901.32 3,696,958.55 33%Oregon School Unit 220 9,727,868.75 636,845.75 7%Kishwaukee College 523 2,408,561.88 81,556.77 3%Marion Township Road 275,794.50 6,764.70 2%Marion Township 203,166.03 4,835.00 2%Stillman Valley Fire District 546,071.62 6,333.17 1%Byron Park District 537,766.04 5,622.09 1%Meridian Unit 223 7,638,510.57 28,042.48 less than 1 %Julia Hull District Library 227,365.20 721.32 less than 1 %Oregon Fire District 407,275.39 556.99 less than 1 %City of Byron 664,602.29 814.93 less than 1 %Byron Township Road 548,577.95 366.86 less than 1 %Byron Township 205,197.50 141.50 less than 1 %

List Attachments Provided: 2011 Real Estate Tax Bill for Byron Station from Ogle County Tax Assessor ODCOUNTY 2 R JOHN H. COFFMAN, COUNTY CC .CTOR 2011 REAL Ef'rATE TAX BILL OGLE COUNTY COURTHOUSE PLEASE READ the Instructions on the back of this bill regarding when 8 PO. BOX 40 pay your taxes. Additional information is provided for changing your mailing OREGON, IL 61061-0040 tax exemptions in which you might be entitled.P, 0 Ind where to address and THIS IS THE ONLY NOTICE YOU WILL RECEIVE FOR BOTH INSTALLMENTS.

COMMONWEALTH EDISON CO PROPERTY TAX DEPT P 0 BOX 767 CHICAGO IL 60690-0000 RECEIPT PORTION -KEEP FOR YOUR RECORDS 2011 OGLE COUNTY REAL ESTATE TAX PAY TO: OGLE COUNTY COLLECTOR FORIUL FO 1 1'CL U AT N-21 The County Treasurer only collects your taxes and is not responsible for the amount of your assessment or the amount of your tax bill. We will be happy to assist you or direct you to the proper authority regarding questions about your tax bill.ASSESSED TO: EXELON GENERATION CO LLC I rn- .I -a .i-RNG/BLK: 10 TWP:24 SECTILOT:13 SE4 BK 01-467 & 470 PARCEL NUMBER (PIN)i09-13.400-002 ACRES TAXABLE VALUE 160.00 468,000,000 CLASS TAX COE.02151 LOCATION OF PROPERlY 4448 N GERMAN CHURCH RD BYRON, IL 61010-0000 TOWNSHIP Rockvale TAIN 9aYn-T: M ý i [I 1-1!NIA.Ul LAND STRUCIURESJBLDGS.

FARM BLDG.FARM LAND BD OF REVIEW EOUALIZED VALUE HOME IMPROVEMENT EXEMPTION VETERANS' EXEMPTION VALUE PRIOR TO STATE EOUALIZE STATE EOuALIZATION FACTOR" X STATE EQUALZED VALUE OWNER OCCUPIED EXEMPTION SENIOR HOMESTEAD EXEMPTION SENIOR ASSESSMENT FREEZE DISABLED PERSONS* EXEMPTION RETURNING VETERANS' EXEMPTION DISABLED VETERANS' EXEMPTION MISC. EXEMPTION TAXABLE VALUE TAX RATE X TOTAL TAX...NOT TO BE USED FOR FARM LAND AND FARM BUILDINGS 533,330 467.4656,670 0 0 468,000,000 0.0 468,000,000 1.0000 468,000,000 0 0 0 0 0 0 0 468,000.000 6.33459$29,645,881.20 OGLE COUNTY OGLE CO. MENTAL HEALTH OGLE CO. EXTENSION OGLE CO. VETERANS ASSISTANCE OGLE CO. SENIOR SERVICES OGLE COUNTY PENSION BYRON FIRE DISTRICT BYRON FIRE DISTRICT PENSION ROCK VALLEY COM COL 511 BYRON UNIT 226 BYRON UNIT 226 PENSION BYRON LIBRARY DIST BYRON LIBRARY DIST PENSION BYRON MUSEUM DISTRICT OREGON PARK DIST OREGON PARK DIST PENSION ROCKVALE TWP ROAD DIST BYRON FORESJPi BYRON FORPST PRES AJEJSIGN ROCKVALE TOWN9HIP~U.5578 0.05303 0.00985 0.00631 0.01507 0.09623 0.41964 0.02700 n45042 3.62505 0.06483 0.15905 0.00608 0.01685 0.37429 0.01715 0.08341 0.33211 0.01014 0.02987 S243.008.66

$45,138.69

$28.917.02

$69.059.00

$440.972.85

$1.923.001.06

$123.726.74 S2,064.049.65

$16,611.788.16

$297.088.94

$728.846.99 527,861.24

$77.215.13

$1,715,183.19

$78,590.61

$382.226.33 S1.521,894.81

$46A65.82 S138,879.28 0.54550 0.033o1 0.00982 0.00628 0.01473 0.09588 0.1563 0.02803 0.45320 3.61111 0.05381 0.16034 0.00355 0.01666 0.38539 0.01860 0.08575 0.33292 0.01235 0.03077 ,553,220.6

$248.086.75

$45,958.96

$29,391.33 S68.935.05

$448,717.65

$1,946,083.45

$131.181.35

$2,120,976.00

$16,900,002.50 5251.823.10

$750.391.10

$16,614.10

$77,968.80 31.808.305.31

$67.047.89

$401.310.00

$1.558.065.77 S57,797.83

$144,003.60

ý 1FV I ýCM I I ý-e rW1 MONTH 29.645.881.0 1 + I.............

OYC~~C I 510 naB An. IA F a~a'aAsaV 5iflAAA 034 'NI.I --21 XFrffjt_ .a vcn4c I K-C- ý- ýýI: m iLr :.e-caamcan4-m Byron Environmental Audit -Request for Additional Information Response Question #: S-6 Category:

Socioeconomics Statement of Question: In addition to property tax payments and payment in addition to taxes (PIAT) information presented in Section 2. 7 of the ER, describe any other major annual support payments, onetime payments, and other forms of non-tax compensation (if any) provided to local organizations, communities, and jurisdictions (e.g., county, municipality, townships, villages, incorporated places, and school districts) on behalf of Byron.Response: Byron Station also provides charitable donations in fairly small amounts to a number of local governmental, charitable, educational and other organizations.

The total of these donations for 2012 was $68,000. The attached chart shows a typical list of all the charitable donations for the year 2011. These charitable donations have not been significantly different in recent years, and are expected to continue at this or a slightly lower level in future years.Byron Station also made a one-time donation to the Ogle County Sheriff's Department of$30,000 in 2013, and a donation of $25,000 to help fund a new Emergency Preparedness Facility at the County in 2011. The station also makes payments to the Illinois Emergency Management Agency (IEMA), a portion of which are sent to Ogle County to assist with the operation of the County Emergency Preparedness Facility.

The portion of Exelon's fee to IEMA that was sent to Ogle County for fiscal 2012 (July 1,2012 -June 30, 2013) was $83,770.List Attachments Provided: Byron Station Charitable Spending For 2011 Byron Station Charitable Spending For 2011 ORGANIZATION-PROJECTTITLE.

2011 AMERICAN CANCER SOCIETY Relay for Life -Ogle West $ 500 ALL VETRANS' MEMORIAL PARK Golf Outing $ 200 OF STEPHENSON COUNTY GolfOuting_

$ 200 AMERICAN YOUTH SOFTBALL ASCAINSoftball tourney $ 400 ASSOCIATION ARTHRITIS FOUNDATION Jingle Bell Run/Walk $ 1,000 AUTUMN ON PARADE Festival $ 500 AUTUMN ON PARADE 5K $ 400 BOY SCOUTS OF AMERICA Pinewood Derby $ 250 BREAD OF LIFE -VALLEY EV. Holiday food drive $ 500 BYRON CHAMBER OF COMMERCE Carriages for Miracle on 2nd $ 400 St.BYRON CIVIC THEATRE Annual program $ 2,000 BYRON COMMUNITY Annual fundraiser

$ 250 REVITALIZATION BYRON COMMUNITY Alumni Challenge

$ 300 REVITALIZATION AlumniChallenge

_ $ 300 BYRON FIRE ASSOCIATION Golf outing $ 370 BYRON FOREST PRESERVE Winter Kids Concerts $ 500 BYRON PARK DISTRICT Baseball and softball teams $ 300 BYRON SCHOOL DISTRICT MathlScience Scholarship

$ 1,000 BYRON TIGERS JUNIOR TACKLE Football season $ 500 CITY OF BYRON Operation Santa $ 750 CITY OF BYRON 4th of July fireworks

$ 1,000 CITY OF DAVIS JUNCTION Weekend in the Park $ 1,500 CITY OF OREGON Historic Coliseum $ 10,000 refurbishment

$_ 10,000 CROSSROADS BLUES SOCIETY Byron Crossroads Blues $ 1,000 Festival fundraiser

$_ 1,000 DISCIPLES UNITED METHODIST CHURCH Crop Walk for Hunger $ 100 DIXON WRESTLING CLUB Sponsorship

$ 100 FIELDS PROJECT, THE Community Art Legacy project $ 1,000 GRAND DETOUR Next Picture Show Photo $ 200 Contest GRANNY ROSE ANIMAL SHELTER Fur Ball 2010 $ 300 HAPPY TAILS INC. Golf fundraiser

$ 400 HARD KNOX BASEBALL Golf fundraiser

$ 300 HOO HAVEN WILDLIFE Exelon Aquatic Center wing $ 10,000 REHABILITATION CENTER ($5k from Chem. too)KEEP NORTHERN ILLINOIS Earth Day fundraiser

$ 500 BEAUTIFUL KNIGHTS OF COLUMBUS -BYRON Tootsie Roll fundraiser

$ 250#4739 Tootsie Roll fundraiser

$ 250 LA VOZ LATINA Annual celebration gala $ 600 LEAF RIVER LIONS CLUB Summer Daze (emergency

$ 3,000 funding)LEAF RIVER LIONS CLUB Summer Daze $ 1,200 LEE COUNTY VETERANS Annual dinner $ 300 COMMISSION I

Byron Station Charitable Spending For 2011 ORGANIZATION PROJECTTITLE

.' 2011 LIFELINE FOOD AND SELF HELP Food pantry donation $ 350 PROJECT MAYWOOD EVANGELICAL Andy Patten Leadership

$ 150 CHURCH Center Golf Outing MERIDIAN C.U.S.D. 223 MathlScience Scholarship

$ 1,000 MONTESSORI LEARNING PATH Fundraiser

$ 75 MORNING STAR PRESCHOOL Fundraiser

$ 300 MOVEMBER Fundraiser for men's health $ 200 OGLE COUNTY HOSPICE Rick Hahn Memorial Run $ 250 ASSOCIATION RickHahnMemorialRun

$_ 250 OREGON CHAMBER OF Oregon Candlewalk

$ 450 COMMERCE OREGON HAWKS SOFTBALL Season sponsor $ 300 OREGON LIONS Car show $ 150 OREGON PARK DISTRICT Oregon Summer Concerts $ 1,000 OREGON SCHOOL DISTRICT MathlScience Scholarship

$ 1,000 OREGON TRAIL DAYS Festival sponsorship

$ 1,000 PEGASUS FOUNDATION Pegasus fundraiser for injured $ 500 riders POWERHOUSE SOFTBALL Yearly entrance fee $ 250 RETREAT & REFRESH STROKE Summer camp $ 500 CAMP Sumrap__0 ROCKFORD ASSOCIATION FOR Annual Scholarship Banquet $ 750 MINORITY MANAGEMENT ROCKFORD MEMORIAL HOSPITAL Neonatal holiday gift $ 300 ROCK VALLEY MUSTANG CLUB Annual car show $ 500 ST. EDWARD SCHOOL Fun Fair $ 250 STERLING PARK DISTRICT Brad Onken Memorial $ 500 S.M.A.R.T.

Summer STERLING STEAM Softball sponsorship

$ 300 STILLMAN VALLEY FIREMAN'S Golf outing $ 500 ASSOCIATION Golfouting

_$_500 TOUR DE FARMS National MS Scolety $ 600 UNIV. OF ILLINOIS EXTENSION 4-H education

$ 275 SERVICE VARIOUS -HOLIDAY Holiday giving $ 5 VETERANS NETWORK COMMITTEE Honor Flight Program $ 125 VILLAGE OF MT. MORRIS Let Freedom Ring Festival $ 1,000 VILLAGE OF MT. MORRIS Christmas decorations

$ 200 VILLAGE OF PROGRESS Winter Wish list $ 750 VILLAGE OF STILLMAN VALLEY Stillman Valley Fall Festival $ 1,000 WINNEBAGO SCHOOL DISTRICT Winnebago Co. Robotics fund $ 5,000 (match with Central fund)WINNING WHEELS Scudder benefit $ 500 WOUNDED HEROES Fishing for a Cure 2011 $ 600 TOTAL$64,511 Byron Environmental Audit -Request for Additional Information Response Question #: S-7 Category:

Socioeconomics Statement of Question: Provide information about any anticipated changes in State and local tax laws, rates, and assessed property value or any other recent or anticipated tax payment adjustments that could result in notable future increases or decreases in property taxes or other payments.Response: Except as stated in the Request for Additional Information Responses S-4, S-5 and S-6, Exelon Generation has no information about future increases or decreases in property taxes or other payments to state and local taxing entities.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: SSSH-1 Category:

Special Status Species and Habitats Statement of Question: The June 20, 2013, final rule that amended 10 CFR Part 51 revised the scope of the transmission line review for license renewal to be those "transmission lines that connect the nuclear power plant to the substation where electricity is fed into the regional power distribution system and transmission lines that supply power to the nuclear plant from the grid" (see 10 CFR 51, Appendix B to Subpart A, Table B-i, Footnote 4). Accordingly, the NRC staff will address only consider those transmission lines that meet this definition in its environmental review.a. Identify the name and location of the substation that connects Byron to the regional grid.b. Clarify which portions of the four 345-kV lines described in Section 3.1.6 of the ER are in scope for the license renewal review according to the 2013 definition.

c. Confirm that the following statement regarding transmission lines that supply power to Byron remains true under the 2013 transmission line scope (Section 3.1.6, Page 3-13, Paragraph 2, of the ER): "No separate transmission lines exist for the purpose of supplying power to Byron from the grid (off-site power)." Response: a. Byron is connected to the regional grid at the on-site 345-kV Byron Station switchyard.
b. Electricity generated at Byron Station is transformed from generator voltage to a nominal 345-kV transmission system voltage by the main power transformers.

The main power transformers are connected via intermediate, on-site transmission lines to the on-site 345-kV Byron Station switchyard.

The location of the intermediate transmission towers on the site property is shown in Byron UFSAR (Exelon Nuclear 2010a), Figure 8.2-3.For ease of reference, a copy of the figure is attached to this response.

Based on this information and that there are no other transmission lines that would be dismantled or otherwise decommissioned as a result of terminating operations at Byron, Exelon concludes that, under the new regulations, the intermediate, on-site transmission lines are the only in-scope transmission lines for the Byron license renewal environmental review. These transmission lines are located entirely within the Byron Station protected area.Under the previous regulations and guidance, the in-scope transmission lines for Byron license renewal included the transmissions lines that were constructed with the station to connect it to the regional electricity grid. Such lines, which are all owned and operated by CoinEd, are identified in the Byron License Renewal ER as follows:* Byron to Wempleton (345-kV line extending north from the Byron switchyard)

  • Byron to Cherry Valley (double circuit 345-kV lines extending east from Byron switchyard)
  • Byron South (345-kv line extending south from Byron switchyard)

None of these transmission lines are in-scope for the Byron license renewal environmental review under the 2013 definition of in-scope transmission lines.c. The statement in the Byron License Renewal ER regarding transmission lines that supply power to Byron Station remains true under the 2013 definition of in-scope transmission lines. A description of the offsite electric power system that supplies power for safety functions is provided in the Byron/Braidwood UFSAR (Exelon Nuclear 2010a), section 3.1.2.2.8 (pp. 3.1-8 and 3.1-9) and Chapter 8.List Attachments Provided: UFSAR (Exelon Nuclear 201 Oa), Figure 8.2-3 REVISION 9 DECEMBER 2002 WEWLETOW RAZaNVI LLE z FENCE z (0-.J METEOROLOGICA.

TIM.~~LonS. 9.9" 31"1 l LAT. 42.4m 5.9*" r',, 1L. ,2SO"-0" z 0 A I CIRCULATING

,, .I 't I AE COOIN plwm ENYRON SYrAl REN UPDATED FINAL SAET AMALYSUM REPORT VALLEY= ~.mmmc mc FlOU a 24 PRPRI P LWAN Byron Environmental Audit -Request for Additional Information Response Question #: .SSSH-2 Category:

Special Status Species and Habitats Statement of Question: Please provide all reports of "unusual or important environmental events" reportable under Appendix B, Section 4.1 to the Byron Operating Licenses (NPF-37 and NPF-66) that have occurred within the past 10 years (2003-2013).

As stated in Section 4.1 of the ER, this would include events such as excessive bird impaction events, onsite plant or animal disease outbreaks, mortality or unusual occurrence of any species protected by the Endangered Species Act of 1973, fish kills, increase in nuisance organisms or conditions, and unanticipated or emergency discharge of waste water or chemical substances.

Response: During the period from January 1, 2003 through the present, no environmental events have occurred for which reporting was required under Appendix B, Section 4.1 to the Byron Operating Licenses.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: TE-1 Category:

Terrestrial Ecology Statement of Question: Byron appears to be located in the vicinity of the Castle Rock State Park and Lowden-Miller State Forest Important Bird Area (IBA) described here: http://netapp.audubon.org/I BA/Site/i 698 Based on the NRC staff's initial review, the Byron site boundaries and the in-scope transmission line corridors do not appear to cross any designated IBAs. Confirm whether these statements are true.Response: Byron is approximately 6 miles northeast of the nearest IBA, and the nearest in-scope transmission line corridor (GELS 1996 version) is approximately 3 miles west of an IBA.Thus, the NRC's initial conclusion regarding the relationship of the in-scope land area in relation to the IBAs is correct -the Byron property and transmission corridors do not cross any designated IBA.It should be noted that, under the final NRC regulations promulgated on June 20, 2013 (78 Federal Register 37282), the License Renewal scope for NEPA review of transmission lines has changed. Under the new regulations, in-scope transmission lines are those that "connect the nuclear power plant to the substation where electricity is fed into the regional power distribution system and transmission lines that supply power to the nuclear plant from the grid." At Byron, the in-scope transmission lines under the new regulations end at the on-site switchyard.

List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: TE-2 Category:

Terrestrial Ecology Statement of Question: In Section 2.4 (Page 2-25), the ER states that "bat houses have been erected and are monitored" on the Byron site as part of wildlife habitat enhancement and conservation education activities.

Provide any monitoring information available on these bat houses, including their locations and any information on what species of bat inhabit them, if any.Response: The interest in bats began in 2007 when Byron personnel noticed bats roosting under an awning and on a brick wall at the Main Access Building (MAB) where employees enter and exit the plant. The bat houses were part of an effort to encourage the bats to feed on the plentiful insects found at the River Screen House (RSH) and roost in a location away from the MAB. Observations have been performed on the houses during Spring and Summer since they were installed, and a few additional houses have been added since 2007.The bat houses are observed while on rounds to check on other bird houses and while visiting the RSH area. The observations are not conducted by biologists trained to identify bat species and primarily serve to ascertain whether bats are present. There have been very few observations of actual bats in the houses. Deposits on foliage below the houses suggest that bats are present, but dusk or dawn observations have not been performed to properly document the number of bats. (Exelon Nuclear 2011 c)List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: TE-3 Category:

Terrestrial Ecology Statement of Question: Section 4.9, Page 4-22, of the ER states that, "All refurbishment activities would occur on previously-disturbed or developed areas that are devoid of natural habitat..." Describe the specific records or information reviewed to determine that the potentially affected areas are devoid of natural habitat, including whether any surveys were conducted.

Response: The areas most likely to be used for activities associated with the hypothetical replacement of steam generators or a reactor vessel head were identified.

These areas would be used primarily for materials laydown and to construct a storage building for the removed components.

Such areas would be located within or near the existing protected area. No surveys were conducted, but a review of aerial photos indicates that the areas most likely to be used are currently lawn or weedy areas that have been previously disturbed and are devoid of natural habitat.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: TE-4 Category:

Terrestrial Ecology Statement of Question: Section 4.9, Page 4-22, of the ER states that, "Some songbirds could be temporarily displaced by noise, machinery, and personnel associated with refurbishment activities, but such disturbances would be temporary and minor. Provide a reference, or describe how this conclusion was reached.Response: The conclusion is based on the field and educational experience of the biological subject matter experts who prepared and reviewed section 4.9 of the ER.List Attachments Provided: None Byron Environmental Audit -Request for Additional Information Response Question #: TE-5 Category:

Terrestrial Ecology Statement of Question: Section 3.1.6, Page 3-14, of the ER states, 'The intention is for these transmission lines to remain a permanent part of the transmission system even after Byron is decommissioned." Provide a written source from CornEd to support this statement.

Response: At the time the Byron License Renewal ER was prepared, the quoted statement was based on verbal communications between CoinEd transmission engineers and Exelon Generation personnel.

The statement has since been confirmed in the attached email message from the CoinEd Manager, Interconnection

& System Studies.List Attachments Provided: Email message from CoinEd (T. Kay) to Exelon Generation (N. Ranek) dated 8/29/2013 From: Kay, Thomas W.:(ComEd)

Sent: Thursday, August 29, 2013 12:12 PM To: Ranek, Nancy L.:(GenCo-Nuc)

Cc: Allen, William ]:(ComEd);

Leeming, Thomas W:(ComEd);

Regner, Ronald F.:(ComEd);

Riedl, Brett A:(ComEd)

Subject:

FW: Byron Station License Renewal Environmental Report -- NRC Request Regarding Transmission Lines Nancy, This is in response to your request below regarding the NRC request regarding transmission lines. The purpose of this e-mail is to confirm that the 345kV transmission lines and switchyards that connect to Station 6 Byron and Station 20 Braidwood are significant components of the ComEd transmission system. I expect that these transmission lines and switchyards would remain as significant components of the CornEd transmission system even after the Byron and Braidwood stations are decommissioned.

As evidence, there have been multiple generation retirements within ComEd in recent years, including Zion Station. In each case, the switchyards and transmission lines connected to these stations continue to serve as important components of the ComEd transmission system.Please contact me if you need additional information.

Best Regards, Tom Kay Manager Interconnection

& System Studies ComEd Ph: 630-437-2758 From: Ranek, Nancy L.:(GenCo-Nuc)

Sent: Wednesday, August 28, 2013 3:15 PM To: Riedl, Brett A:(ComEd)Cc: Allen, William ]:(ComEd);

Leeming, Thomas W:(ComEd);

Fulvio, Albert A:(GenCo-Nuc)

Subject:

Byron Station License Renewal Environmental Report -- NRC Request Regarding Transmission Lines Hi Brett-As we discussed today, the Exelon Generation Nuclear License Renewal Department has filed an application for renewal of the Byron Station NRC Operating License. The application includes an Environmental Report (ER), which identifies 4 transmission line circuits (and their rights-of-way) that were constructed at the time the Station was constructed to connect it to the regional electricity grid.The applicable NRC regulations at the time the Byron License Renewal Application was prepared specified these transmission lines as being within the scope of the license renewal environmental review. For your reference, I am attaching the pages from the Byron Station License Renewal ER (Section 3.1.6) that identify and describe the "in-scope" transmission lines.1 of 2 Section 3.1.6 in the ER contains the following sentence at the top of page 3-14: "The intention is for these transmission lines to remain a permanent part of the transmission system even after Byron is decommissioned." The NRC Staff is currently reviewing the Byron Station License Renewal ER, and during the week of September 16, 2013, they will conduct a License Renewal Environmental Audit at the Station. Among other things, the NRC Staff has asked Exelon Generation to provide during the Audit a ComEd source (i.e., reference document) for the above-quoted sentence.During our conversation today, you indicated that, while a published document may not be available as a reference, it is your belief that the sentence is accurate.

Accordingly, I am requesting that, after reviewing the attached section 3.1.6 from the Byron Station License Renewal ER, you or an appropriate CoinEd spokesperson that you identify provide an email response to this message confirming that the statement in the Byron Station License Renewal ER accurately represents ComEd's intention.

Please note that an application for renewal of the Braidwood Station NRC Operating License is also currently under review by the NRC, and a License Renewal Environmental Audit for Braidwood is scheduled for November 2013. We have not yet received NRC's requests for information for the Braidwood Audit. However, because the Braidwood Station License Renewal ER (Section 3.1.6) contains information and a statement about Braidwood transmission lines that are similar to those in the Byron ER, I am also attaching the pages from the Braidwood Station License Renewal ER (Section 3.1.6) to this message. It would be helpful if ComEd's email response could also confirm that the statements in the Braidwood Station License Renewal ER regarding the Braidwood transmission lines (page 3-14, next to last paragraph) accurately represent ComEd's intention for those lines.Thanks in advance for your support of the Byron and Braidwood License Renewal Project.Please call if there are questions or you need additional information.

Regards, Nancy L. Ranek License Renewal Environmental Lead Exelon Generation, LLC 200 Exelon Way, KSA/2-E Kennett Square, PA 19348 Phone: 610-765-5369 Fax: 610-765-5658 Email: nancy.ronek@exeloncorp.corn 2 of 2 Byron Environmental Audit -Request for Additional Information Response Question #: WR-GW-1 Category:

Water Resources

-Groundwater Statement of Question: Provide copies of the following ER references:

a. (Exelon Nuclear 2011 b) Exelon Nuclear, 2011, "Hydrogeologic Investigation Report, May 2011". As discussed during the environmental audit conducted in September 2013.Response: The requested reference is attached.List Attachments Provided: 1. Exelon Nuclear 2011 b. NEI 07-07 Update, Hydrogeologic Investigation Report, Byron Generating Station. Prepared for Exelon Generation Company, LLC by Conestoga-Rovers & Associates, Ref. No. 072245 (2). May 2011.

15X 10 11 ( C NCr'zoI NEI 07-07 UPDATE HYDROGEOLOGIC INVESTIGATION REPORT BYRON GENERATING STATION BYRON, ILLINOIS Prepared for Exelon Generation Company, LLC DISCLAIMER:

SOME FORMATTING CHANGES MAY HAVE OCCURRED WHEN THE ORIGINAL DOCUMENT WAS PRINTED TO PDF; HOWEVER, THE ORIGINAL CONTENT REMAINS UNCHANGED.

Prepared by: Conestoga-Rovers

& Associates 8615 W. Bryn Mawr Avenue Chicago, Illinois U.S. 60631 Office: (773) 380-9933 Fax: (773) 380-6421 web: http://www.CRAworid.com MAY 2011 REF. NO. 072245 (2)Worldwide Engineering, Environmental, Construction, and IT Services TABLE OF CONTENTS 1.0 HYDROLOGIC STUDIES COMPLETED SINCE 2006 ...................................................

1 1.1 ADDITIONAL HYDROGEOLOGIC STUDIES COMPLETED AT THE STATION ................

1 1.2 GROUNDWATER SAMPLING PROGRAMS ESTABLISHED OUTSIDE THE REQUIREMENTS OF THE STATION'S RGPP ......................

1 1.3 ADDITIONAL GROUNDWATER AND SURFACE WATER MONITORING POINTS ESTABLISHED AT THE STATION SINCE 2006... 1 1.4 TRENDS IN THE ROUTINE RGPP DATA WHICH INDICATE CHANGES IN CONDITIONS

........................

1 2.0 SUBSURFACE DISTURBANCE/CONSTRUCTION SINCE 2006 ................................

3 2.1 MAJOR SUBSURFACE CONSTRUCTION BUILT INTO THE GROUNDWATER TABLE ............

3 2.2 OTHER HYDROGEOLOGIC STUDIES OR GEOTECHNICAL ASSESSMENTS OR ENGINEERING EVALUATIONS

.. 3 2.3 NATURAL OR MAN-MADE EROSION WHICH OCCURRED AT THE STATION ..................................

3 3.0 CHANGES IN ON-STATION PROPERTY OR OFF-SITE GROUNDWATER SUPPLIES SINCE 2006 ........................

4 3.1 WATER SUPPLY EVALUATIONS ON AND OFF THE STATION PROPERTY ....................

4 3.2 RESULTS OF WATER WELL INVENTORY SEARCHES SINCE 2006 ..........

4 3.3 CHANGES IN THE USE OF GROUNDWATER ON THE STATION PROPERTY ...................................

4 3.4 INSTALLATION AND OPERATION OF WATER SUPPLY WELLS OFF THE STATION PROPERTY (CHANGES IN GROUNDWATER USE OFF THE STATION PROPERTY)

.4 3.5 LICENSED PROPERTY BOUNDARY REVISED OR THE STATION SOLD OR PURCHASED ADDITIONAL LANDS ..........

4 4.0 SPILLS OR LEAKS REPORTED TO AGENCIES AND DOCUMENTED SINCE 2006 ... 5 4.1 LEAKS OF LIQUID RADWASTE, TRITIATED WATERS OR OTHER SPILLS TO THE SOILS AND REQUIRED REPORTING TO A STATE OR FEDERAL AGENCY ...... 5 4.2 HYDROGEOLOGIC STUDIES (IDENTIFIED IN QUESTION 1.0 ABOVE) PERFORMED IN RESPONSE TO THESE SPILLS/ LEAKS ...... 5 4.3 RELEASES OF OTHER CONTAMINANTS (NON RADIOLOGICAL)

TO THE SUBSURFACE SOILS AND GROUNDWATER AT THE STATION .... 5 0 072M4 (2)1 CONESTOGA-ROVERS

& AssoclATES TABLE OF CONTENTS 5.0 CHANGES IN EXISTING GROUNDWATER REMEDIAL ACTIONS SINCE 2006 ........ 6 5.1 STATUS OF GROUNDWATER OR SURFACE WATER REMEDIATION SYSTEMS FOR TRITIUM OR OTH ER RADIO N UCLIDES .............................................................................

6 5.2 STATE OR LOCAL AGENCY REQUIRED ADDITIONAL GROUNDWATER ACTIONS ON OR OFF THE STATION PROPERTY ...... 6 5.3 STATUS OF GROUNDWATER OR SURFACE WATER REMEDIATION SYSTEMS FOR OTHER, NON-RADIOLOGICAL, CONTAMINANTS

........ 6 6 .0 S U M M A R Y .................................................................................................................................

7 072245 (2)2 CONESTOGA-ROVERS

& ASSOCIATES LIST OF FIGURES (Following Text)FIGURE 1.4A FIGURE 1.4B FIGURE 2.1 MONITORING WELL LOCATIONS AND TRITIUM CONCENTRATIONS

-OCTOBER 2010 GROUNDWATER CONTOUR MAP -OCTOBER 2010 LOCATIONS OF THE CATHODIC WELLS LIST OF TABLES (Following Text)

SUMMARY

OF TRITIUM RESULTS

SUMMARY

OF GROUNDWATER ELEVATIONS

SUMMARY

OF EXISTING WELL INFORMATION TABLE 1.4A TABLE 1.4B TABLE 1.4C LIST OF ATTACHMENTS (Following Text)APPENDIX 1.1 APPENDIX 1.4 TRITIUM PRECIPITATION RECAPTURE STUDY PERFORMED FROM SEPTEMBER 2009 TO AUGUST 2010 MONITORING WELL AND STRATGRAPHIC LOGS 072245 (2)3 CONESTOGA-ROVERS

& ASSOCIATES OVERVIEW This summary report has been prepared to document changes in Site conditions that would require an update to the Byron Generating Station (Byron Station) Hydrogeologic Investigation Report (HIR) in accordance with NEI 07-07. The Byron Station HIR was completed in September 2006 as part of the first set of fleet wide investigations.

The guidance in NEI 07-07 require that reviews of hydrogeologic studies be performed when any of the following occurs:* Substantial on-Site construction

  • Substantial disturbance of Site property* Substantial changes in on-Site or off-Site use of water, or* Substantial changes in on-Site or nearby off-Site groundwater pumping rates In addition, NEI 07-07 guidance suggests that the HIR be updated with changes to the characterization of hydrology or geology at the Site. The other changes that Exelon has identified as being substantial and, therefore, necessary to update the HIR include: " Significant modification to the Site Conceptual Model based upon new groundwater, geologic, or chemistry data;* Newly documented releases or leaks of tritium or other radionuclides into the subsurface;
  • The change of operation of remediation systems at the Site;* The collection and documentation of subsequent groundwater quality and groundwater level data since the initiation of the 2006 groundwater study at the Byron Station.This report presents changes in Site conditions, analytical data, and hydrologic information acquired from September 2006 through December 2010 per NEI 07-07.These changes have been identified by Exelon personnel at the Station or by CRA through its work at the Station. This summary report discusses the general nature of these changed conditions and refers to various appendices for further detail. It is anticipated that a more comprehensive presentation and evaluation of the changes identified herein will be incorporated into an updated version of the "Hydrogeologic Investigation Report" for this Station.072245 (2) CONESTOGA-ROVERS

& ASSOCIATES 072245 (2)CONESTOGA-ROVERS

& ASSOCIATES

1.0 HYDROLOGIC

STUDIES COMPLETED SINCE 2006 1.1 ADDITIONAL HYDROGEOLOGIC STUDIES COMPLETED AT THE STATION One hydrogeologic study has been completed since September 2006. This study involved the collection of rain at eight locations surrounding the facility and analyzing the captured rainfall for tritium. The study is entitled "Tritium Precipitation Recapture Study performed from September 2009 to August 2010" and is presented as Appendix 1.1.1.2 GROUNDWATER SAMPLING PROGRAMS ESTABLISHED OUTSIDE THE REQUIREMENTS OF THE STATION'S RGPP No other groundwater sampling programs or studies have been implemented at the Byron Generating Station from September 2006 through December 2010.1.3 ADDITIONAL GROUNDWATER AND SURFACE WATER MONITORING POINTS ESTABLISHED AT THE STATION SINCE 2006 No other groundwater or surface water monitoring programs or studies have been implemented at the Byron Generating Station from September 2006 through December 2010.1.4 TRENDS IN THE ROUTINE RGPP DATA WHICH INDICATE CHANGES IN CONDITIONS The Byron Station monitors tritium at 13 monitoring wells and groundwater elevations at 22 monitoring wells. Tables 1.4A through 1.4C summarize tritium data, monitoring well construction, and water level data.Monitoring well locations and tritium concentrations are presented on Figure 1.4A.Tritium concentration data for these wells are summarized in Table 1.4A.Tritium concentrations tend to be stable or decreasing from September 2006 through December 2010. Routine monitoring of these wells will continue to determine whether the trend is long-term.

0 072245 (2) 1 CON ESTOGA-ROVERS

& ASSOCIATES Table 1.4B presents a summary of groundwater level data. Groundwater contours from the most recent data are presented on Figure 1.4B. Groundwater flow in the area is generally to the west from the Station towards the Rock River.A summary of monitoring well construction details is presented in Table 1.4C.Monitoring well and stratigraphic logs are presented in Appendix 1.4.072245 (2)2 CONESTOGA-ROVERS

& ASSOCIATES

2.0 SUBSURFACE

DISTURBANCE/CONSTRUCTION SINCE 2006 2.1 MAJOR SUBSURFACE CONSTRUCTION BUILT INTO THE GROUNDWATER TABLE Three cathodic protection wells were installed in 2009 and 2010. Each boring was drilled to bedrock, approximately 500 feet below ground surface. No water was withdrawn during drilling activities.

Locations of the cathodic wells are presented on Figure 2.1. The well construction and boring logs were unavailable.

2.2 OTHER

HYDROGEOLOGIC STUDIES OR GEOTECHNICAL ASSESSMENTS OR ENGINEERING EVALUATIONS No other geotechnical or engineering studies have been completed at the Station from September 2006 through December 2010.2.3 NATURAL OR MAN-MADE EROSION WHICH OCCURRED AT THE STATION There have been no occurrences of natural or man-made erosion at the Station from September 2006 through December 2010.072245 (2)3 CONESTOGA-ROVERS

& AssocIATES

3.0 CHANGES

IN ON-STATION PROPERTY OR OFF-SITE GROUNDWATER SUPPLIES SINCE 2006 3.1 WATER SUPPLY EVALUATIONS ON AND OFF THE STATION PROPERTY The Byron Generating Station obtains non-contact cooling water from the Rock River, which is used in the electricity generation process. Additionally, there are two deep wells within the protected area (Deep Well 1 and Deep Well 2) that are used for the Station's water supply.There have been no additional water supply evaluations on or off the Station property from September 2006 through December 2010.3.2 RESULTS OF WATER WELL INVENTORY SEARCHES SINCE 2006 The Station has not performed a water well inventory since 2006.3.3 CHANGES IN THE USE OF GROUNDWATER ON THE STATION PROPERTY There have been no changes in the use of groundwater at the Byron Station from September 2006 through December 2010.3.4 INSTALLATION AND OPERATION OF WATER SUPPLY WELLS OFF THE STATION PROPERTY (CHANGES IN GROUNDWATER USE OFF THE STATION PROPERTY)There have been no changes in surface water or groundwater use off the property from September 2006 through December 2010.3.5 LICENSED PROPERTY BOUNDARY REVISED OR THE STATION SOLD OR PURCHASED ADDITIONAL LANDS There have been no changes in the property boundary and no land has been purchased or sold from September 2006 through December 2010.072245 (2) 4 CONESTOGA-ROVERS

& ASSOCIATES 072245 (2)4 CONESTOGA-ROVERS

& AssocIATES

4.0 SPILLS

OR LEAKS REPORTED TO AGENCIES AND DOCUMENTED SINCE 2006 4.1 LEAKS OF LIQUID RADWASTE, TRITIATED WATERS OR OTHER SPILLS TO THE SOILS AND REQUIRED REPORTING TO A STATE OR FEDERAL AGENCY No reportable leaks occurred at the Byron Station from September 2006 through December 2010.4.2 HYDROGEOLOGIC STUDIES (IDENTIFIED IN QUESTION 1.0 ABOVE) PERFORMED IN RESPONSE TO THESE SPILLS/LEAKS Since there were no reportable leaks at Byron Station during this period, no additional hydrogeologic studies were performed.

4.3 RELEASES

OF OTHER CONTAMINANTS (NON RADIOLOGICAL)

TO THE SUBSURFACE SOILS AND GROUNDWATER AT THE STATION No reportable releases of non-radiological contaminants have occurred at the Byron Station from September 2006 through December 2010.U72245 (2)5 CONESTOGA-ROVERS

& ASSOCIATES

5.0 CHANGES

IN EXISTING GROUNDWATER REMEDIAL ACTIONS SINCE 2006 5.1 STATUS OF GROUNDWATER OR SURFACE WATER REMEDIATION SYSTEMS FOR TRITIUM OR OTHER RADIONUCLIDES There have been no changes to the groundwater or surface water remediation systems at the property from September 2006 through December 2010.5.2 STATE OR LOCAL AGENCY REQUIRED ADDITIONAL GROUNDWATER ACTIONS ON OR OFF THE STATION PROPERTY No additional monitoring or remedial actions have been required by State or local agencies on or off the property.5.3 STATUS OF GROUNDWATER OR SURFACE WATER REMEDIATION SYSTEMS FOR OTHER, NON-RADIOLOGICAL, CONTAMINANTS There are no groundwater or surface water remediation systems for non-radiological contaminants at the Byron Station.072245 (2) 6 CONESTOGA-ROVERS

& ASSOCIATES 072245 (2)6 CONESTOGA-ROVERS

& ASSOCIATES 6.0

SUMMARY

This document demonstrates that Byron Station has completed its review of the Groundwater Protective Initiative in accordance with objective 3.1 (b) of the NEI 07-07 guidance.The following summarizes the major changes in Site characteristics from September 2006 through December 2010: Hydogeologic Studies* A tritium precipitation recapture study was preformed from September 2009 to August 2010.Subsurface Disturbance and Construction a Three cathodic protection wells were installed in 2009 and 2010.Changes in Groundwater Supplies On and OaStation Property* There have been no changes in the use of groundwater on or off Station property from September 2006 through December 2010.Spills and Leaks Reported to Agencies* No reportable releases or leaks of non-radiological contaminants occurred from September 2006 through October 2010." No reportable releases or leaks of tritium or other radiological contaminants occurred from September 2006 through October 2010.Changes in Groundwater Remedial Activities" There are no groundwater or surface water remediation systems for non-radiological contaminants on or off Station property." There are no groundwater or surface water remediation systems for tritium or other radiological contaminants on or off Station property.072245 (2)7 CONESTOGA-ROVERS

& ASSOCIATES 0-~rn EXELOt4 GENERATON4 COLANY, ILL 1TuiXCO.ICarTAYPce.

OCCTOBB2O BYWN GmftIMC STATI)t awVk. KLIEC

-~,, if -j. J~I *'~ I I) ~i / ~I2 4~~j[Ill -~f I-I I'-A 7 ~> 1<\ K'~7>2W..l'

\~7 I r~ 7 f f2 i I-,--' .~~aL:==c,-~!1 I b-- .....,I (1 7LZE)I--j I ii I .. ..

U- -~-x --cA11~mc*-Ht-II --i~I I I TABLE 1.4A

SUMMARY

OF TRITIUM RESULTS FOR THE BYRON GENERATING STATION Sample Location AR-1 AR-1 AR-2 AR-2 AR-3 AR-3 AR-4 AR-4 AR-7 AR-7 AR-8 AR-8 AR-9 AR-9 AR-10 AR-10 AR-11 AR-11 CAR-1 CAR-3 CAR-3 DF-24 DF-24 TW-13 TW-13 Sample Name BY-AR-1_20100517 BY-AR-1_20101022 BY-AR-2_20100519 BY-AR-2_20101020 BY-AR-3_20100519 BY-AR-3_20101020 BY-AR-4_20100519 BY-AR-4_20101021 BY-AR-7_20100517 BY-AR-7_20101021 BY-AR-8_20100517 BY-AR-8_20101021 BY-AR-9_20100517 BY-AR-9_20101022 BY-AR-1020100517 BY-AR-1020101022 BY-AR-11_20100520 BY-AR-11_20101021 BY-CAR-I_20101020 BY-CAR-3_20100517 BY-CAR-3_20101021 BY-DF-24_20100519 BY-DF-24_20101021 BY-TW-13_20100519 BY-TW-13_20101021 Sample Date 5/17/2010 10/22/2010 5/19/2010 10/20/2010 5/19/2010 10/20/2010 5/19/2010 10/21/2010 5/17/2010 10/21/2010 5/17/2010 10/21/2010 5/17/2010 10/22/2010 5/17/2010 10/22/2010 5/20/2010 10/21/2010 10/20/2010 5/17/2010 10/21/2010 5/19/2010 10/21/2010 5/19/2010 10/21/2010 Parameter Result (pCVL)Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium Tritium<LLD<LLD<LLD<LLD<LLD<LLD 1250 1170<LLD<LLD<LLD<LLD<LLD<LLD<LLD<LLD 1120 947<LLD<LLD<LLD<LLD<LLD<LLD<LLD Activity 55.3 60.6 30 101 63 84.4 1250 1170 179 254 130 104 80.2 22.7 45.4 158 1120 947 59.8 109 45.1 132 46.6 92.6 38.6 Result Error+/-96.9+/-101+/-99+/-105+/-98.9+/-104+/-173+/-168+/-103+/-113+/-99.4+/-106+/-96.5+/-99+/-98.6+/-107+/-162+/-149+/-99.1+/-103+/-100+/-104+/-98.6+/-98.9+/-100 CRA 072245 (2)

TABLE 1.4B Page 1 of 5

SUMMARY

OF GROUNDWATER ELEVATIONS AT THE BYRON GENERATING STATION Well ID Measurement Date TOC Depth to Water Groundwater Elevation AR-1 3/23/2006 871.1 39.7 831.4 AR-1 4/4/2006 871.1 39.72 831.38 AR-1 4/26/2006 871.1 35.16 835.94 AR-1 11/1/2006 871.1 37.88 833.22 AR-1 6/2/2008 871.1 33.67 837.43 AR-1 10/1/2008 871.1 32.41 838.69 AR-1 4/29/2009 871.1 33.55 837.55 AR-1 10/13/2009 871.1 34.86 836.24 AR-1 5/17/2010 871.1 36.12 834.98 AR-1 10/22/2010 871.1 38.2 832.9 AR-2 3/23/2006 867.38 65.69 798.68 AR-2 4/4/2006 867.38 11 798.31 AR-2 4/26/2006 867.38 68.88 798.5 AR-2 11/1/2006 867.38 69.9 797.48 AR-2 10/8/2007 867.38 63.42 803.96 AR-2 5/29/2008 867.38 54.8 812.58 AR-2 9/29/2008 867.38 56.2 811.18 AR-2 4/29/2009 867.38 48.85 818.53 AR-2 10/13/2009 867.38 54.4 812.98 AR-2 5/17/2010 867.38 48.91 818.47 AR-2 10/20/2010 867.38 51.71 815.67 AR-3 3/23/2006 860.64 59.6 798.16 AR-3 4/4/2006 860.64 60.27 797.49 AR-3 4/26/2006 860.64 63.77 796.87 AR-3 11/1/2006 860.64 64.5 796.14 AR-3 10/8/2007 860.64 58.33 802.31 AR-3 5/29/2008 860.64 55.8 804.84 AR-3 9/29/2008.

860.64 57.5 803.14 AR-3 4/29/2009 860.64 54.32 806.32 AR-3 10/14/2009 860.64 56.54 804.1 AR-3 5/17/2010 860.64 55.35 805.29 AR-3 10/20/2010 860.64 56.02 804.62 AR-4 4/27/2006 832.74 90 742.74 AR-4 11/21/2006 832.74 92.07 740.67 AR-4 10/10/2007 832.74 88.5 744.24 AR-4 5/28/2008 832.74 84.6 748.14 AR-4 9/29/2008 832.74 88.1 744.64 AR-4 4/29/2009 832.74 79.26 753.48 AR-4 10/15/2009 832.74 87.72 745.02 AR-4 5/17/2010 832.74 81.01 751.73 AR-4 10/21/2010 832.74 88.9 743.84 AR-5 3/23/2006 795.75 105.37 687.9 AR-5 4/4/2006 795.75 104.21 689.06 CRA 072245 (2)

TABLE 1.4B Page 2 of 5

SUMMARY

OF GROUNDWATER ELEVATIONS AT THE BYRON GENERATING STATION Well ID Measurement Date TOC Depth to Water Groundwater Elevation AR-5 4/27/2006 795.75 107.67 688.08 AR-5 11/21/2006 795.75 108 687.75 AR-5 10/10/2007 795.75 108.33 687.42 AR-5 5/28/2008 795.75 106.75 689 AR-5 9/29/2008 795.75 107.55 688.2 AR-5 4/28/2009 795.75 104.8 690.95 AR-5 10/14/2009 795.75 107.27 688.48 AR-5 5/17/2010 795.75 105.08 690.67 AR-5 10/20/2010 795.75 107.46 688.29 AR-6 3/23/2006 784.55 107.75 674.47 AR-6 4/4/2006 784.55 107.54 674.68 AR-6 4/27/2006 784.55 109.55 675 AR-6 11/21/2006 784.55 109.8 674.75 AR-6 10/10/2007 784.55 109.33 675.22 AR-6 5/28/2008 784.55 107.9 676.65 AR-6 9/29/2008 784.55 108.85 675.7 AR-6 4/28/2009 784.55 106 678.55 AR-6 10/14/2009 784.55 109.1 675.45 AR-6 5/17/2010 784.55 105.2 679.35 AR-6 10/20/2010 784.55 109.26 675.29 AR-7 4/4/2006 871.28 103.02 765.96 AR-7 4/27/2006 871.28 104.54 766.74 AR-7 10/30/2006 871.28 102.86 768.42 AR-7 6/2/2008 871.28 83.4 787.88 AR-7 10/1/2008 871.28 84.9 786.38 AR-7 4/29/2009 871.28 77.67 793.61 AR-7 10/13/2009 871.28 80.41 790.87 AR-7 5/17/2010 871.28 79.57 791.71 AR-7 10/21/2010 871.28 80.7 790.58 AR-8 4/4/2006 872.11 53.57 816.14 AR-8 4/27/2006 872.11 33.56 838.55 AR-8 10/30/2006 872.11 35.25 836.86 AR-8 6/2/2008 872.11 23.55 848.56 AR-8 10/1/2008 872.11 20.45 851.66 AR-8 4/29/2009 872.11 21.71 850.4 AR-8 10/13/2009 872.11 20.35 851.76 AR-8 5/17/2010 872.11 24.13 847.98 AR-8 10/21/2010 872.11 24.4 847.71 AR-9 4/27/2006 876.77 59.5 817.27 AR-9 10/30/2006 876.77 57.56 819.21 AR-9 6/2/2008 876.77 45.89 830.88 AR-9 10/1/2008 876.77 45.65 831.12 CRA 072245 (2)

TABLE 1.4BP Page 3 of 5

SUMMARY

OF GROUNDWATER ELEVATIONS AT THE BYRON GENERATING STATION Well ID Measurement Date TOC Depth to Water Groundwater Elevation AR-9 4/29/2009 876.77 44.51 832.26 AR-9 10/13/2009 876.77 43.66 833.11 AR-9 5/17/2010 876.77 44.35 832.42 AR-9 10/22/2010 876.77 44.14 832.63 AR-10 4/26/2006 859.15 21.49 837.66 AR-10 11/1/2006 859.15 21.7 837.45 AR-10 6/2/2008 859.15 16.18 842.97 AR-10 10/1/2008 859.15 17.02 842.13 AR-10 4/29/2009 859.15 15.25 843.9 AR-10 10/13/2009 859.15 16.85 842.3 AR-10 5/17/2010 859.15 16.14 843.01 AR-10 10/22/2010 859.15 18.09 841.06 AR-11 4/26/2006 831.65 89.24 742.41 AR-11 11/21/2006 831.65 98.9 732.75 AR-11 10/10/2007 831.65 110.42 721.23 AR-11 5/28/2008 831.65 86.85 744.8 AR-11 9/29/2008 831.65 89.95 741.7 AR-11 4/29/2009 831.65 83.06 748.59 AR-11 10/15/2009 831.65 89.18 742.47 AR-11 5/17/2010 831.65 84.3 747.35 AR-11 10/21/2010 831.65 88.35 743.3 CAR-1 3/23/2006 694.87 20.03 672.22 CAR-1 4/4/2006 694.87 20.06 672.2 CAR-1 4/27/2006 694.87 22.24 672.63 CAR-1 11/1/2006 694.87 22.95 671.92 CAR-1 10/8/2007 694.87 27.5 667.37 CAR-1 5/28/2008 694.87 21.08 673.79 CAR-1 9/29/2008 694.87 22.5 672.37 CAR-1 4/29/2009 694.87 18.88 675.99 CAR-1 10/14/2009 694.87 22.87 672 CAR-1 5/17/2010 694.87 19.05 675.82 CAR-1 10/20/2010 694.87 23.17 671.7 CAR-2 3/23/2006 772.01 32.9 736.5 CAR-2 4/4/2006 772.01 26.84 742.56 CAR-2 4/27/2006 772.01 35.12 736.89 CAR-2 11/2/2006 772.01 35.32 736.69 CAR-2 10/8/2007 772.01 36.58 735.43 CAR-2 5/28/2008 772.01 35.2 736.81 CAR-2 9/29/2008 772.01 35.4 736.61 CAR-2 4/28/2009 772.01 28.62 743.39 CAR-2 10/14/2009 772.01 34.96 737.05 CAR-2 5/17/2010 772.01 29.4 742.61 CRA 072245 (2)

TABLE 1.4B Page 4 of 5

SUMMARY

OF GROUNDWATER ELEVATIONS AT THE BYRON GENERATING STATION Well ID CAR-2 CAR-3 CAR-3 CAR-3 CAR-3 CAR-3 CAR-3 CAR-3 CAR-3 CAR-3 DF-24 DF-24 DF-24 DF-24 DF-24 DF-24 DF-24 DF-24 DF-24 DF-24 DF-24 GW-9 GW-9 GW-9 GW-9 GW-9 GW-9 GW-9 GW-9 GW-9 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-3 Measurement Date TOC Depth to Water Groundwater Elevation 10/21/2010 4/4/2006 4/27/2006 10/30/2006 6/2/2008 10/1/2008 4/29/2009 10/13/2009 5/17/2010 10/21/2010 3/23/2006 4/4/2006 4/26/2006 11/21/2006 10/10/2007 5/28/2008 9/29/2008 4/29/2009 10/14/2009 5/17/2010 10/21/2010 4/28/2006 11/21/2006 10/10/2007 5/29/2008 9/29/2008 4/28/2009 10/14/2009 5/17/2010 10/21/2010 3/23/2006 4/4/2006 4/26/2006 11/1/2006 10/8/2007 5/29/2008 9/29/2008 4/28/2009 10/14/2009 10/21/2010 4/26/2006 772.01 872.16 872.16 872.16 872.16 872.16 872.16 872.16 872.16 872.16 813.68 813.68 813.68 813.68 813.68 813.68 813.68 813.68 813.68 813.68 813.68 841.73 841.73 841.73 841.73 841.73 841.73 841.73 841.73 841.73 861.77 861.77 861.77 861.77 861.77 861.77 861.77 861.77 861.77 861.77 858.6 37.11 44.49 45.64 43.83 33.95 31.21 30.2 26.47 34.29 34.8 91.28 91.11 89.89 92.1 89.17 80.9 87.35 74.4 85.46 79.7 85.4 96.27 92 89.5 79.85 93.5 82.8 81.1 81.4 98.15 61.82 61.01 62.14 63.15 57.5 49.65 53.35 42.4 49.72 47.6 71.09 734.9 824.62 826.52 828.33 838.21 840.95 841.96 845.69 837.87 837.36 722.4 722.57 723.79 721.58 724.51 732.78 726.33 739.28 728.22 733.98 728.28 745.46 749.73 752.23 761.88 748.23 758.93 760.63 760.33 743.58 799.95 800.76 799.63 798.62 804.27 812.12 808.42 819.37 812.05 814.17 787.51 CRA 072245 (2)

TABLE 1.4B Page 5 of 5

SUMMARY

OF GROUNDWATER ELEVATIONS AT THE BYRON GENERATING STATION Well ID MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 TW-13 TW-13 TW-13 TW-13 TW-13 TW-13 TW-13 TW-13 TW-13 TW-14 TW-14 TW-14 TW-14 TW-14 TW-14 TW-14 TW-14 TW-14 TW-15 TW-15 TW-15 TW-15 TW-15 TW-15 TW-15 TW-15 TW-15 WELL 7 WELL 7 WELL 7 WELL 7 WELL 7 WELL 7 WELL 7 WELL 7 Measurement Date 11/1/2006 10/8/2007 5/29/2008 4/28/2009 10/14/2009 10/21/2010 4/27/2006 11/1/2006 10/8/2007 5/28/2008 9/29/2008 4/29/2009 10/14/2009 5/17/2010 10/21/2010 4/27/2006 11/1/2006 10/8/2007 5/28/2008 9/29/2008 4/29/2009 10/14/2009 5/17/2010 10/21/2010 4/27/2006 11/1/2006 10/8/2007 5/28/2008 9/29/2008 4/29/2009 10/14/2009 5/17/2010 10/21/2010 4/27/2006 10/10/2007 5/29/2008 9/29/2008 4/28/2009 10/14/2009 5/17/2010 10/21/2010 TOC 858.6 858.6 858.6 858.6 858.6 858.6 700.47 700.47 700.47 700.47 700.47 700.47 700.47 700.47 700.47 699.41 699.41 699.41 699.41 699.41 699.41 699.41 699.41 699.41 695.73 695.73 695.73 695.73 695.73 695.73 695.73 695.73 695.73 891.24 891.24 891.24 891.24 891.24 891.24 891.24 891.24 Depth to Water 72.6 69.33 68.15 67.45 59.95 68.86 17.11 17.42 17.63 16.61 16.9 16.21 17.09 16.25 17.2 26.48 27.3 27 24.95 26.7 22.26 27.02 22.45 27.36 22.84 23.72 23.25 21.27 23 18.61 23.35 18.8 23.7 115.77 102 87.3 106.5 86.2 81.32 82.6 87.45 Groundwater Elevation 786 789.27 790.45 791.15 798.65 789.74 683.36 683.05 682.84 683.86 683.57 684.26 683.38 684.22 683.27 672.93 672.11 672.41 674.46 672.71 677.15 672.39 676.96 672.05 672.89 672.01 672.48 674.46 672.73 677.12 672.38 676.93 672.03 775.47 789.24 803.94 784.74 805.04 809.92 808.64 803.79 CRA 072245 (2)

TABLE 1.4C Page 1 of 3

SUMMARY

OF EXISTING WELL INFORMATION BYRON GENERATING STATION BYRON, ILLINOIS Surface Reference X coor. Y coor. Elevation Elevation Sample Location (State Plane Coordinates) (ft AMSL) 2 (ft AMSL)Screened Interva l Top BoEgsBttom Top BottomA Middle (ft bgs)3 1 (ft AMSL)Well Construction Hydrogeologic Unit Screened 1 Exelon-Owned Wells Previously Existing Water Wells GW-9 4 2532455.60 1972488.60 Well 7 4 2538213.33 1969732.76 Deep Well 1 2537066.85 1970148.36 Deep Well 2 2535936.76 1969964.84 841.51 891.17 NA NA 841.73 NA 5 891.24 NA NA NA NA NA Monitoring Wells Installed During the Blowdown Line Investigation AR-1 2536048.98 1972460.65 868.11 871.10 AR-2 2534570.16 1973401.77 864.37 867.38 AR-3 2533354.08 1973345.67 857.76 860.64 AR-4 2530325.59 1974343.03 830.23 832.74 AR-5 2526970.90 1974279.73 793.27 795.75 AR-6 2526375.64 1974201.54 782.22 784.55 AR-7 2536172.26 1970914.51 868.99 871.28 AR-8 2536591.62 1970080.22 869.71 872.11 AR-9 2537777.21 1970783.66 873.77 876.77 AR-10 2537573.15 1971916.71 856.65 859.15 AR-11 2530300.13 1974330.58 829.35 831.65 CAR-1 2525447.90 1974018.64 692.25 694.87 CAR-2 2529246.47 1974300.12 769.40 772.01 CAR-3 2537064.71 1970545.52 869.11 872.16 TW-1 2536119.01 1972474.04 868.81 870.70 TW-2 2536137.15 1972477.09 869.11 870.73 TW-3 2534676.01 1973300.70 866.92 868.35 TW-4 2534674.53 1973321.59 866.53 869.48 TW-5 2533371.75 1973305.18 858.37 860.78 TW-6 2533370.28 1973323.29 858.07 859.93 TW-7 2530360.35 1974366.22 830.91 832.25 TW-8 2530358.62 1974386.10 830.10 831.67 TW-9 2527013.94 1974272.31 793.82 796.42 TW-10 2527013.99 1974256.60 793.70 795.88 TW-11 2526439.04 1974253.50 782.38 785.16 50 71 60 99.5 102 95 102 30 55.5 19 139.5 45 25 43 3.5 2 5.5 5.5 3 3.5 6 7 3 2.5 5 NA NA 1500-1500 70 81 70 119.5 122 115 112 50 65.5 29 149.5 55 35 63 8.5 7 10.5 10.5 8 8.5 11 12 8 7.5 10 818.11 798.11 808.11 793.37 783.37 788.37 797.76 787.76 792.76 730.73 710.73 720.73 691.27 671.27 681.27 687.22 667.22 677.22 766.99 756.99 761.99 839.71 819.71 829.71 818.27 808.27 813.27 837.65 827.65 832.65 689.85 679.85 684.85 647.25 637.25 642.25 744.40 734.40 739.40 826.11 806.11 816.11 865.31 860.31 862.81 867.11 862.11 864.61 861.42 856.42 858.92 861.03 856.03 858.53 855.37 850.37 852.87 854.57 849.57 852.07 824.91 819.91 822.41 823.10 818.10 820.60 790.82 785.82 788.32 791.20 786.20 788.70 777.38 772.38 774.88 6-inch open hole 6-inch open hole 12 to 15-inch open hole 12 to 15-inch open hole 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen GPWT GPWT GPWT GPWT GPWT GPWT GPWT GPWT GPWT GPWT BGP UAWT GPWT GPWT Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden GPWT GPWT NA NA CRA 72245 (2)0 0 TABLE 1.4C Page 2 of 3

SUMMARY

OF EXISTING WELL INFORMATION BYRON GENERATING STATION BYRON, ILLINOIS Surface Reference X coor. Y coor. Elevation Elevation Sample Location (State Plane Coordinates) (ft AMSL) 2 (ft AMSL)Monitoring Wells Installed During the Blowdown Line Investigation Screened Interva I Top Bottom Top Bottom Middle (ft bgs) 3 (ft AMSL)Well Construction Hydrogeologic Unit Screened TW-12 TW-13 TW-14 TW-15 2526438.39 1974235.97 2525412.16 1974276.44 2525537.43 1974058.60 2525587.27 1973925.58 783.38 698.03 697.40 694.32 Byron Salvage PRP Group-Owned Monitoring Wells DF-IS DF-ID DF-2S DF-3S DF-4DS DF-4DD DF-5S DF-6 DF-7S DF-7D DF-8 DF-10 DF-11 DF-12 DF-13 DF-15 DF-17 DF-18 DF-19 DF-22S DF-22D DF-23 DF-24 DF-25 MW-1 MW-2 MW-3 CRA 72245 (2)2531216.65 1973682.92 2531226.90 1973676.38 2531242.96 1973864.59 2531570.17 1973536.07 2532386.02 1973588.26 2532385.52 1973588.31 2532646.87 1973412.71 2531991.61 1973735.68 2527903.67 1975299.65 2527898.09 1975298.28 2530141.74 1973270.87 2532417.79 1974527.51 2532534.02 1974574.44 2532609.19 1974523.28 2532200.73 1973830.53 2532645.11 1972942.97 2531725.46 1972911.91 2531124.33 1973590.07 2531143.77 1973770.63 2531524.65 1972931.42 2531524.95 1972931.41 2530101.41 1972863.81 2530081.29 1974051.80 2530981.83 1973779.38 2534233.15 1973475.34 2534208.57 1973479.15 2533174.54 1973415.41 785.49 786.32 794.44 790.26 831.41 NA 843.19 826.31 709.98 709.67 755.05 833.04 833.05 831.43 836.33 846.50 817.65 777.77 786.13 808.73 808.73 752.57 812.28 785.15 859.96 860.08 855.90 785.32 700.47 699.41 695.73 786.89 787.48 794.96 791.82 832.98 832.79 844.12 827.89 712.38 712.55 757.47 834.01 834.21 834.48 838.84 847.79 820.14 780.28 788.53 811.85 811.56 755.39 813.68 786.36 861.77 861.07 858.6 7 13 24 24 12 18 34 29 44 79 59 51 46 144 13 118 22 43 58 69 68 127 106 7 115 45 55 76 101 60 19 NA 13 225 14 59 84 74 66 61 149 65 123 27 48 63 84 83 132 111 115 120 60 65 86 106 65 102 NA 71 230 76 776.38 771.38 773.88 685.03 680.03 682.53 673.40 663.40 668.40 670.32 665.32 667.82 741.49 726.49 733.99 707.32 702.32 704.82 735.44 720.44 727.94 739.26 724.26 731.76 785.41 770.41 777.91 830.19 778.19 804.19 708.31 703.31 705.81 687.98 682.98 685.48 666.67 661.67 664.17 697.05 692.05 694.55 764.04 749.04 756.54 765.05 750.05 757.55 704.43 699.43 701.93 730.33 725.33 727.83 839.50 731.50 785.50 702.65 697.65 700.15 732.77 717.77 725.27 731.13 721.13 726.13 732.73 722.73 727.73 707.73 702.73 705.23 692.57 687.57 690.07 793.28 710.28 751.78 846.96 788.96 817.96 635.08 630.08 632.58 841.90 779.90 810.90 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen 2-inch PVC screen Shallow Overburden Shallow Overburden Shallow Overburden Shallow Overburden 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 6-inch open hole 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 6-inch open hole 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 2-inch stainless steel screen 6-inch open hole 4-inch open hole 2-inch stainless steel screen 4-inch open hole GPWT BGP GPWT GPWT GPWT BGP GPWT BGP UAWT UAM BGP GPWT GPWT BGP MGP GPWT BGP GPWT GPWT GPWT BGP BGP GPWT NA GPWT SS GPWT TABLE 1.4C Page 3 of 3

SUMMARY

OF EXISTING WELL INFORMATION BYRON GENERATING STATION BYRON, ILLINOIS Surface Reference X coor. Y coor. Elevation Elevation Sample Location (State Platte Coordinates) (ft AMSL) 2 (ft AMSL)Screened Interval Top Bottomn Top Bottom Middle (ft bgs) 3 I (ft AMSL)Well Construction Hydrogeologic Unit Screened Byron Salvage PRP Group-Owned Monitoring Wells MW-15 2532472.31 1974788.27 821.22 MW-16 2532464.57 1974786.05 821.29 MW-20R 2532466.05 1974790.91 820.57 MW-21 2532458.60 1974791.94 820.42 MW-30 2530196.65 1972880.11 754.70 MW-36 2532608.79 1973569.23 841.60 MW-37 2532608.88 1973558.19 841.16 MW-39 2532616.75 1974389.87 834.18 MW-41 2531156.40 1975401.53 814.46 MW-42 2532613.32 1974380.69 834.21 PC-lB 2530160.35 1973268.15 755.49 PC-IC 2530162.01 1973286.18 755.80 PC-2B 2532010.43 1974162.53 840.43 PC-3B 2532010.72 1973717.55 826.58 PC-4B 2531377.35 1973122.19 800.53 PC-5B 2530689.47 1973701.97 786.26 PC-6B 2531016.38 1974314.45 828.85 822.23 823.47 821.85 821.63 758.68 843.73 843.33 836.67 816.87 836.31 757.28 757.89 842.54 828.3 802.8 788.35 831.01 75 109 181 224 27 146 192 175 111 141 36 101 85 67 71 62 86 86 120 191 234 37 156 202 185 121 151 46 111 103 78 81 72 96 746.22 735.22 740.72 2-inch stainless steel screen 712.29 701.29 706.79 2-inch stainless steel screen 639.57 629.57 634.57 2-inch stainless steel screen 596.42 586.42 591.42 2-inch stainless steel screen 727.70 717.70 722.70 2-inch stainless steel screen 695.60 685.60 690.60 2-inch stainless steel screen 649.16 639.16 644.16 2-inch stainless steel screen 659.18 649.18 654.18 2-inch stainless steel screen 703.46 693.46 698.46 2-inch stainless steel screen 693.21 683.21 688.21 2-inch stainless steel screen 719.49 709.49 714.49 2-inch stainless steel screen 654.80 644.80 649.80 2-inch stainless steel screen 755.43 737.43 746.43 2-inch stainless steel screen 759.58 748.58 754.08 2-inch stainless steel screen 729.53 719.53 724.53 2-inch stainless steel screen 724.26 714.26 719.26 2-inch stainless steel screen 742.85 732.85 737.85 2-inch stainless steel screen GPWT BGP SS SS GPWT BGP SS SS BGP BGP GPWT SS GPWT GPWT GPWT GPWT GPWT Notes: 1 Hydrogeologic unit screened:

GPWT, well open to the water table in the Galena-Platteville aquifer BGP, well open to the base of the Galena-Platteville aquifer MGP, well open to the middle of the Galena-Platteville aquifer UAWT, well open to the water table in the unconsolidated aquifer UAM, well open to the middle of the unconsolidated aquifer SS, well open to the St. Peter Sandstone aquifer 2 ft AMSL -feet Above Mean Sea Level 3 ft bgs -feet below ground surface 4 The tops of the wells for GW-9 and Well 7 are located underground within concrete vaults. The surveyed reference elevation is actually the top of the metal rim of the concrete vault at the ground surface.5 NA -not available CRA (2)

Attachment 1 .1 Tritium Precipitation Recapture Study performed from September 2009 to August 2010 There were eight collection locations that were located at the eight points of the compass (North, Northeast, East, Southeast, South, Southwest, West and Northwest) and the collections sites were about 260 ft to 350 ft from the vent stacks. The West and Southwest sites were within 200 ft of exhaust venting that was occurring during work performed in the spent fuel area for the dry cask storage project.Summary of the amount of precipitation collected.

Yearly total ranged from South with 41.3 inches (July Max of 9.22 inches) and West with 30.98 inches (July Max 6.17 inches). July was wettest month for all rain gauges, and least amount of precipitation fell in February (All locations were about 0.45 inches)Tritium results were none detected (<200 picocuries

/ L) for months September 2009, December 2009, February 2010, June to August 2010 and for any locations and months other than the following.

For October 2009 (when Byron Station was in a refueling outage) the following locations had positive results, North had 288 picocuries

/ L, Southwest had 303 picocuries

/ L, West had 550 picocuries

/ L, Northwest had 413 picocuries

/ L. November 2009 had East with 1160 picocuries

/ L and West has 380 picocuries

/ L. January 2010 had Northwest with a 405 picocuries

/ L. March 2010 had the South location with 638 picocuries

/ L and the Southwest location with 437 picocuries

/ L. In April the station had another refueling outage and the South location had 620 picocuries

/ L, the Southwest location had 703 picocuries

/ L and the West location had 719 picocuries

/ L. In May 2010 the Northeast location had 641 picocuries

/ L.There was a single rain event on April 5th that a separate analysis was performed at the direction of Corporate.

Rainfall amount was between 0.75 inches to 0.9 inches.Tritium results were Southwest (319 picocuries

/ L), West were (617 picocuries

/ L) and all the others were less than 200 picocuries

/ L.So in summary the majority of the rainfall amounts showed less than 200 picocuries

/ L and the highest monthly tritium was in November of 2009 at the East rain gauge with 1160 picocuries

/ L. Timeframes near refueling outages (October & November 2009 and March, April and May 2010) had 12 of the 13 positive tritium recapture monthly composites with all locations but Southeast having been positive at least once.

tA~l.L E * .*u m i = --.VVEL-L %-,Wkill A .Site: OTFAO5FA92 Count Site Name: Byron SalvaQe Yard Drilling Contractor:

Wehling Well Works JDriller:

Wahing well Works Geologist:

y. Ogle Well No.: MW-1 Grid Coordinates:Northing 1973429.130 Easting 737685.285 Date Drilling Started: 03/0889 Scott Speashardt Date Drilling Ended: 03/08/89 4 r1l.;11; Upthnej* Air Mist Rotary and Covina DrillinoFluid Itvoe): Water f'~,.Ii...,,'.

kAntt9nil Air Mist Rotary and Corino i~JugI.qI.~

Iv.~...w-.

..-- ------- ---- -------. ---ANNULAR SPACE DETAILS: Type of Surface Seal: N/A Type of Annular Sealant: Cement Poruant Grout Amount of cement: # of bags 4 lbs. per bag 94 Amount of bentonite:

  1. of bags N/A lbs. per bag N/A Type of bentonite seal (granular.

pellets):

N/A Amount of bentonite:

  1. of bags N/A lbs. per bag N/A Type of Sand Pack: N/A Source of Sand: NIA 862.15 MSL Top of Protective Casing 862.12 MSL Top of Surface Casing 2 Ft. of Protecdve Casing Stickup 1.97 FL of Surface Casing Stickup 86o.15 MSL Ground Surface7.875 in. Borehole j Portland Cement Grout 13 FL Bottom of Surface Casing Amount of Sand: # of bags N/A lbs. per bag N/A[I WELL CONSTRUCTION MATERIALS:

-i-....Date of Construction:

318189 Stainless Steel specify Type Teflon speciy Type PVC Specly Type Ofher specfy Type--i -I Riser Couoling Joint N/A 1E -I t11 SRiser ow~e above W.T.N/A WI *9~9~ -9. ~4 -Riser pipe below W.T.N/A Screen WA Coupling joint screen to riser N/A Protective Casing 6 in SWel Surface Casing 4 in s.s.MEASUREMENTS to 0.01 ft. (where applicable)

Riser pipe length N/A Protective casing Length N/A Screen length N/A Bottom of screen to end cap N/A Top ofscreen to first joint N/A LengM of surface casing 14.97 ft (13 ft in depth)Screen slot size N/A No. of opening in screen N/A ID of Riser Pipe N/A Diameter of bore hole 7 7/8 in Ask 0 3.875 in. Borehole 70.83 Ft. Bottom of Borehole IMFWell Constructed By: Wehlin2 Well Works Surveyed By: U.S. Army Corps of Engineers I IForm Completed By: Scoot Prinos USGS J I itle: OTFAOSFA92 Coul ty: Ogle Well No.: MW-2 Grid Coordinates:Northing 1973432.842 Easting 737660.554 Site Name: Byron Salvagce Yard Drilling Contractor:

Wehling Well Works nrilkar Wehling Well Works Geologist:

Scott Spasshardt Date Drilling Started: 02/27189 Date Drilling Ended: 03/22189 Drillino Method: Air Mist Rotary and Coarq Drilling Fluid (type): Water ANNULAR SPACE DETAILS: Type of Surface Seal: N/A Type of Annular Sealant: Cement Portlant Grout 861.45 MSLTopd Lod rgLxSasirg 8681 a MSL Top of Riser pipe 1.25 FLeLgcc jSura Ca*'gSifp 1.18 Ft. of Riser Stickup Amount of cement: # of bags 29 lbs. per bag 94 Amount of bentonite:

  1. of bags lbs. per bag Type of bentonite seal (granular, pellets):_

_ _Volday Pellets Amount of bentonite:

  1. of bags, 3 bud ls bs. per bag 50 Ibsbucket Type of Sand Pack: Silica Blasting Sand Source of Sand: N/A.N N 860.20 MSL Ground Surface 7.875 in. Borehole 2 in. Stainless Steel Casing Amount of Sand: # of bags 1 1/2 lbs. per bag 100 WELL CONSTRUCTION MATERIALS:

... ..r J " r Date of Construction:

3/22189 steelw Teflon speciy I Speify Type I Type I PVC specify Type Other Specify Type ,- 9-l ..--Riser Coupling Joint Flush Threaded Riser pipe above W.T. 2is.s -n -Riser pipe below W.T. 2 in s.s Screen 2 in s.s -Coupling join screen to riser IA *W'A_Protective Caiing 4 in s.s. -Surface Casing -B-k MEASUREMENTS to 0.01 ft. (whom applcable)

Riser pipe length 226.0 Pro-ctive casing len, N/A Screenlength f5 Bottom of screen to end cap 231.0 Top of screen first joint WA L,,gth of suLabt casing 14.18 ft (13 ft in depth)Screen slot size .010 No. of opening in scrsen N/A I D of Riser Pipe 2 in Diameter of bore hole 7 7/8in.j Flush Threaded Joints F-13 Ft. Bottom of Surface Casing 2100A8 Ft. Top of Seal.8..95 Ft. Total Seal Interval 219.43 Ft Top of SandPack 11-67 Ft. Total Sand Interval 224.83 FL Top of Screen I I I I 4.75 in. Borehole 5 Ft. Total Screen Interval 229.83 Ft. Bottom of Screen d 231.1 Ft. Bottom of Borehole Well Constructed By: Wehling Well Works Surveyed By: U.S. Army Corps of Engineers Form Completed By: Scott Prinos USGS USGS R.~ i4¶I I I I WELL COMPLETION RECORD Sihe: OTFAOsFA92 Count Site Name: Byron SaOvae Yard Drilling Contractor.

Wehlinq Well Works Driller: Wehlinc Well Works Geologist:

y: owe Grid Coordinates:Northing Well No.: MW-3 1017.103 Easting 736944.336 to Drilling Started: 03)28)89 te Drilling Ended: 03/28/99 I)Scott Spessahsdt Drilling Method: Air-rnist Rotary Drilling Fluid (type):.ANNULAR SPACE DETAILS: Type of Surface Seal: N/A Type of Annular Sealant: Portland Cement Grout!U1sGS P."w1.91 Amount of cement: # of bags 4 lbs. per bag 94 Amount of bentonite:

  1. of bags IVA lbs. per bag Type of bentonite seal (granular.

pellets):

WA Amount of bentonite:

U of bags N/A lbs. per bag N/A Type of Sand Pack: N/A Source of Sand: N/A 858.82 MSL Top of Protective Casing 2.76 Ft. of Locking Surface Casing Stickup 856.06 MSL Ground Surface 7.875 in. Borehole 4 in. Stainless Steel Surface Casing Amount of Sand: # of bags N/A lbs. per bag N/A I WELL CONSTRUCTION MATERIALS:

.0 ODte of Construction:

3/28/89 Stainless-Steel Type Teflon Specify Type PVC sTly Type Other Specify Type Riser Coupling Joint N/A Riser pipe above W.T. N/A Riser pipe below W.T. N/A Screen N/A Coupling joint screen to riser N/A Protective Casing N/A Surface Casing 4 in s.s.MEASUREMENTS to 0.01 ft. (where applicable)

Riser pipe length N/A Protective casing length N/Alength N/A Bottom of screen to emd cap N/A Top of screen to first ioint N/A Length of surface casing 16.56 ft (13.8 ft in depth)Screen slot size N/A No. of opening in screen N/A D of Ris Pipe N/A Diameter of bore hole 7 7/8 in to 13.8f 3 7/8 in to 75.78 ft 138F. otmofSraeS 13.8 Ft. Bottom of Surface-Casing 3.875 in. Borehole I...da I.Well Constructed By: Wehling Well Works Surveyed By: U.S. Army Corps of Engineers Form Completed By: Scott Prinos USGS 75.7s Ft. Bottom of Borehole WELL COMPLETION RECORD Site: OTFA 5AFL 92 Site Name: Byron SalvaQe Yard Drilling Contractor:

U.S.G.S. C Driller. U.S.G.S. Coal Branch Geolog County: 001e Grid Coordinates:Northing

oal Branch Well No.
DF-2S 819.717 tt.Easting 734694.770 te Drilling Started: 8-1 te Drilling Endea: 8.1 -.I 1811. WaterB-7511.

-...-ist: Bob Kay l r')r!lhnn M4=Innll;Tri Cone Roller 0 -75 ft.Drillinn Fluid ftvneV r)nmn Metnod: Drillinn Fluid Itypel-ANNULAR SPACE DETAILS: Type of Surface Seal: Quick Crete -Barker Lumber Type of Annular Sealant: Portland Cement Barker Lumber Amount of cement: # of bags 6.25 lbs. per bag 94 Amount of bentonite:

  1. of bags 0_ lbs. per bag 50 Type of bentonite seal (granular.

pellets):

Pellets 0.65 (50 lbs. buckets) 16 Ibs. per feet ELEVATION

-0.01 ft.795.74 MSL Top of Protective Casino 1 795.29 MSL Top of Riser Pipe 1.14 Ft. of Protective Casing Stickup 0.69 FL of Riser Stickup 794.60 MSL Ground Suriace 2.00 Ft. Bottom of Surface ciuc Amount of bentonite:

  1. of bags 0 lbs. per bag N/A Type of Sand Pack: 0.35 -0.45 mm Silica Sand Source of Sand: American Materal Amount of Sand: # of bags 1.75 lbs. per bag 100 WELL CONSTRUCTION MATERIALS:

I -I Date of Construction:

9/27/90 Stainless Steel Specfy Type Teflon Specify Type PVC Specify Type Other Specify Type_ __ser Coupling d T304 R;ser pioe above W.T. T304 Riser pipe below W.T. T304 Screen T304 Coupling oint screen to riser T304 Protective Casing Bladc Pipe Surface Casing Sch 80 MEASUREMENTS to 0.01 ft. (where applicable)

Riser pipe length 60.1 ft Protective casing lenglh 10.00 in. x 5.00 ft Screen length 15.00 ft.Bottom of screen to end cap 2.00 in.Top of screen to first joint 2.00 in.Total length of casing 8.00 in x 18.0 It.Screen slot size 0.01 in.No. ot opening in screen 2571 I 0 of Riser Pipe 2.067 in.Diameter of bore hole 9.875 in.) 0.00 ft -18.0 ft 4.75 in.) 18.0 it- 75.0 ft.50.0 Ft. Total Portland Cement 18.0 Ft. Bottom of Surface Casing 50.0 FL Top of Seal 2.0 Ft. Total Seal Interval 52.0 Ft- Top of SandPack 5.0 Ft. Total Sand Interval 57.0 Ft. Top of Pea Gravel 59.4 Ft. Top of Screen 18.0 Ft. Total Pea Gravel Interval 15.0 Ft. Total Screen Interval 74.40 Ft. Bottom of Screen 75.0 Ft. Bottom of Borehole I I Well Constructed By: USGS -Wisconsin District Surveyed By: Army Corp. of Engineers Form Completed By: Bart J. Manion USGS -WRD Drillirn Driller Drilling ame: Byron Salvage Yard Grid Coordinates:Northing 1973367.106 ft. Easting 736098.90 g Contractor:

U.S.G.S. Coal Branch Date Drilling Started: 8-23-9=U.S.G.S. Coal Branch Geologist:

Bob Kay Date Drilling Ended: 8-23-9(cr one Roller -.a Method: Pneun,?i.

wnmmpr 11. AR h Drilling Fluid (type): Water ANNULAR SPACE DETAILS: Type of Surface Seal: Quick Crete -Barker Lumber Type at Annular Sealant: Ponland Cement ELEVATION

-0.01 ft.844.91 MSL Top of Protective Cas.1.33 Ft. 01 Protective Casing Stic 844.29 MSL Top of Surface Casir 0.71 Ft. of Surface Casing Slicku Barker Lumber Amount of cement: # of bags 0 lbs. per bag 94 Amount of oentonite:

  1. of bags l0 bs. per bag 50 Type oi bentonite seal (granular, pellets): 843.58 MSL Ground Surta 2.00 Ft. Bottom of Surface pi Amount of bentonite:
  1. of bags 0 lbs. per bag N/A Type of Sand Pack: 0.35 -0.45 mm Silica Sand Source of Sand: American Materials I Amount of Sand: # of bags 0 lbs. per bag 100 WELL CONSTRUCTION MATERIALS:

--.-.-Date of Construction:

8/23/90 Stainless Steel Specify Type Teflon Specify Type PVC specly Type Other Specify Type I Riser Coupling Joint Riser pipe above W.T.Riser pipe below W.T.Screen Coupng joint screen to riser ---Protective Casing BlacPi Surface Casing --Sch 80 MEASUREMENTS t 0.01 ft. (where applicable)

Riser pipe length N/A Protective casing long,, 10 in. x 4.00 ft Screen lengtth N/A Bottom at screen to end cap N/A Top ot screen to first joint NIA Total lenTh of casing 8.00 in x 13.0 ft.Screen slot size N/A No. of opening in screen N/A ID of Riser Pipe N/A Diameter of bore hole 9.875 in.) 0.00 ft -13.0 ft* , 6.0 in. 13.0 ft- 65.0 ft.13.0 Ft. Botom of Surface*Casing 65.0 Ft. Bottom ol Borehole Well Constructed By: USGS -Wisconsin District Surveyed By: Army Corp. of Engineers

/ USEPA Form Completed By: Ban J. Manion USGS -WRD WELL COMPLETION RECORD UMGS R" I 4M Site: OTFA 5AFL 92 County: Site Name: Byron Salvage Yard G0 Drilling Contractor:

U.S.G.S. Coal Brar Driller: U.S.G.S. Coal Branch Geologist:

Drilling Method: TO Cone Roller 0 -150.8 ft. D r},Ogle Well No.: DF-6 rid Coordinates:Northing 1973690.603 ft. Easting 7365443.429 ft.ich Date Drilling Started: Bob Kay Date Drilling Ended: 8-13-49)rilling Fluid (type): Air 0 -36.0 ft. Water 36.0 -150.8 ft.ANNULAR SPACE DETAILS: Type of Surface Seal: Quick Crete -Barker Lumber Type of Annular Sealant: Portland Cement- Barker Lumber-- Borehole pI Vol Grom Bentie C Pellets. Silica Sand I I Amount of cement: # of bags 3.0 lbs. per bag 94 Amount of bentonite:

  1. of bags 4.0 lbs. per bag 50 Type of bentonite seal (granular, pellets):

Pellts 2.oBuckets (50 lbs. buckets)828.23 MSL Top of Protective Casing 828.11 MSL Top of Riser Pipe 1.82 FL of Protective Casing Stickup 1.38 Ft. of Riser Stickup1 826.70 MSL Ground Surface 1.5 Ft. Bottom of Surface plug.... I ' '=Amount of bentonite:

  1. of bags 2.5 lbs. per bag 50 Type of Sand Pack: 0.35 -0.45 mm Silica Sand Source of Sand: American Material Amount of Sand: # of bags 1.0 lbs. per bag 100 I Ft. Total Portland Cemrent 19.1 Ft. Top Bentonite Grout WELL CONSTRUCTION MATERIALS:

" I- I -]el I Dote of Construction:

5/16/91 StainlessSpecly Type Teflon Speciy Type PVC Specfy Type Other Specify Type I I I Riser Coupling Joint T304 Riser pipe above W.T. T304 Riser pipe below W.T. T304 Screen T304 Coupling int screen to riser T304 Protective Casing Bkxl:k Surface Casing sch 80 MEASUREMENTS to o.o1 Il. (where applicable)

Riser pipe lengt 119.0 ft Protective casing length 10.00 in. x 4.0 ft Screen l 5.0 ft.Bottom of screen to end cap 2.00 in.Top of screen to first toint _ 2.00 in.Total lengt of cauin 8.00inlD x 25.0 It Screen slot size 0.01 in.No. of opening in screen 857 I D of Riser Pipe 2.067in.Diameter of bore hole 9.875 in.) 0.00 ft -25.0 ft 5.875 in.125.0 ft -150.8 It.FL Bottom of Surface 25.0 Casing 0 89.5 FL Total Bentonite Grout 108.6 Ft. Top of Seal 4.0 Ft. Total Seal kerval 112& Ft. Top of SandPack 2.0 Ft. Total Sand Interval 114.6 Ft Top of Pea Gravel 117.6 FL Top of Sreeam 8.0 Ft. Total Pea Gravel Interval 5.0 FL Total Screen Interval 122.6 Ft Bottom of Screen and Top of Silica Sand 124.9 Ft. Top of Bentonite Pellets 127.7 Ft. Top of Bentonite Chips I 0 Ft. Top of Volclay Grout Well Constructed By: USGS Wisconsin District Surveyed By: Army Corp. of Engineers Form Completed By: Bart J. Manion " USGS -WRD 150.8 Ft. Bottom of Borehole i, WELL CONSTRUCTION LOG T1.68 ft a -4.0" BOREHOLE 4.0" CASING TemDorar 0.0' to 21.0' bgs 3 7/8 INCH DIAMETER DRILLED HOLE-WELL CASING 2-0 INCH DIAMETER 316 stainless steel 6A. ft*gal.)o3 SLURRY o3 PELLETS X NONE y PROJECT 7089RBCECO WELL PC-38 .TOWN/CITY Byron COUNTY Ogle STATE IL PERMIT NO. N/A LAND-SURFACE ELEVATION AND DATUM 826.84 feet I SURVE" 1 above MS-. 03 ESTIMATE INSTALLATION DATE(S) 3/9/89 to 3/13/8'DRILWNG METHOD Flight auger. NX core,.d DRILWNG CONTRACTOR Fox Drilling, Ing DRILLING FLUID Clear water from Byron Municipal Water Supply DEVELOPMENT TECHNIQUE(S)

AND DATE(S)4/1//89 Airlift, no water 4/24/89 Brainard-Kilman PVC hand pump-_.FLUID LOSS DURING DRILLING 1300 WATER REMOVED DURING DEVELOPMENT 300 .&I BENTONITE 64.0 ft*STATIC DEPTH TO WATER 70.84 67.0 ft*FEET BELOW M.P-WELL SCREEN 2.0 INCH DIAMETER 11.0' _ SLOT 316 staineess steel ,-0 GRAVEL PACK-8 SAND PACK--0 FORMATION COLLAPSE PUMPING DEPTH TO WATER N/A FEET BELOW M.P PUMPING DURATION N/A HOURS YIELD N/A gpm DATE N/A SPECIFIC CAPACITY N/A gpm/ft WELL PURPOSE water table monitoring we: REMARKS-Initial Water Level: 68.2' bgs-Didh't use bentonite pellets for se..due to likely bridging in boring-Tremied in volclay grout 78.0 ft"-93nt____ft.E3 BENTONITE BACKFILL

  • SAND N FORMATION to 83'MEASURING POINT IS TOP OF WELL CASING UNLESS OTHERWISE NOTED.* DEPTH BELOW LAND SURFACE r PREPARED BY D.P. Edwards q S DEPTH BELOW LAND SURFACE IERM -North Central, Inc.r -- W -.-. f %5 ZourcwZfl ansgtinsu GELOICDRLLLO PROJECT KNSI4ER 'SHEET NO. HOL.E No.GEOLOGIC DRILL LOG r oJ c DIRKS FARM 17089RBCECO I1 OF 4 p ITE COORDINATES GLE FROM HORI BEAR DIR KS FARM N 1973671; E 735463 Vertical ......BEGUN iCOMPLETED PRILLE " RILLING EQUIPNENT 8ORING CIA. ITOTAL DEPTH 3-9-89 13-13-891 Fox Drilling CME 75 w/ 4" Flight Auger & NX Core 4.0)" 93.0 CORE RECOVERY (FT./%) CORE A PLESW L. TOP CASING OROUND EL. I PTH/EL. GROUiN WATER EPTH/EL. TOP OF ROCK I8 3 /266 h/ 8.0 ATO 70.6/ 28.52 26.8 7 68.8/8.0 24-HOUR l 21.0/805.8 SAMPLE DEVICE CASING LEFT IN HOLE: DIA./LENGTH LOGGED BY: 2"x 2' Split Spoon and NX Core NONE D.P. Edwards S __CnS/RC Can tmi.ant'1 4,4m n U tJP.NOTES ON: q. CL I 4C EE.C ATER REETLR, I, I CL Ix NJ I DESCITON AND CLASSIFICATION AS 0 Qz CHARACTER OF 0 is 0 MoJ SS-l 1.31 2.0 4 0. 00100 SS-2 2.0 2.0 12 0.0 0.0 0.0 13 17 SS-3 2.0 2.0 IS 0.0 0.0 0.0 27 20 24 5 820.3 6-3 10~j ight brown, Genhe, poorly sorGed, VA.AX/n I= TO COARSI SAND w/ trace Su. e coarse gravel, moist.Keddish brown, medium dense, moderately sorted. CLAYEY ?DMB TO MEDIUM SAND wI trace fine gravel, moist.RUN I 1.8 5.5 0.0 0.0-0.0°0.0 809.3 17.5 DUNLir FORMATION oa ti GALENA GROUP: Light yellowish brown, sandy to finely crystalline, thin to medium bedded, DOLOMITIC CALCARENITE, vug w/FeOX stained fine carbonate send infilings, fosailifermus, occasional green i-Auger refusal 17.3' -0'-Smooth coring; 1OO water return; drill rate: 0.55 ft/mrin T mut*uuaUt CPtEMIMI~

U~WEC IC? YE shl -ri -rfreta disltino"WTAUTW&UT ermcculun WATCe ICTTCe .^

ERM -North Central, Inc.Environmental Reeouw,- MUajment 001iEnvironmental Resources Management GEOLOGIC DRILL LOG I;PROJECT IPROJEC INUMBER KSEET NO. IN l No: DIRKS FARM.~as~kaz ~ 2r..Contaminant

.- _ ______________

NOTES ON: L. 8ErnLAVER

T WATER LEUELSO 0 '0 0 It .4 ItN aj ~ ~ ~ o~ g 3 U. CE 4IL CLEE. LESCRIPTXON AND CLASSXFXCATXON WATER RLETURN, SRUN 4.4 5.0 0.0 0.0 0.0 0.0 RUN 3 4.5 5.0 1 8.0 0.0 00 0.0 RUN 10.0 10.0 i11- 0.0 0.0 0.0 794.4 32.4 789.1.37.7 4 30-skeletal fragments, fractured (2 horisontal

& I vertical) w/ heoay mineral infillinp.-Same as above wi/numerous fractures and bedding planes (22 horizontal, 1 vertical &a fracture sone from 23.5' to 24.2').-Same as above w/ fractures (33 horisontal A 4 vertical).-Smooth coring; 10 water return; drill rate: 0.50 ft/min-Smooth coring 16 0 water retur; drill rate: 0.60 ftLmin-Smooth coring; 90¶,C water return; drill rate: 0.40 ft/min-Core blocked out 4 3S-I lORMATMON of the GAWI(A GROUP: Buff, sandy to finely crysallinet, thin to medium bedded, DOLOMITE, vugv w/FeOX stained fine carbonate sand inWiliu, fvmalifermis, abundant reddish-bron shale parting., preferential dissolution of skeletal Frabouts, Weatnsvely fractured (20--- .ontal & I vertical) w/ heavy mineral.4 0 QUMTM MWL ]ORMATION of th-PL&TrEVW.L GROUP: Buff ad light gray. Anely Crystalline, argillaeeous, thin to medium bedded, slighty fosie , DOLOMITE / occasional rup, chaet modules, shale beds, heavy mineral accumulations, peloids, phosphate nodules and FeOX stained bedding planes, some fractures (27 horisontal

& 3-70 to 80 degree).-Same as above w/ abundant fractures and bedding planes (40 horizontal

& 10-70 to so degree).-Smooth coring; 100 water return; drill rate: 0.33 ft/min R N1 10.0 1 10.0 142.01 0.0 j 0.0)1 0.0 1

.5 ( I j ERM -North Central, Inc.Environmental Resources Manzgement GOJECT PROJECT Nu ER ISHEET NO. HOLE NO.GEOLOGIC DRILL LOG r DIRKS FARM 7089RBCECO I 3 OF 4 1Pm? jj=_ si/~'a- Can smarantj aI .1G 114 ^' % NOTES OH 4, L IE a. ELE g E LAYER WATER LEVELS,.411E OVC 4 QI-1& .-4 C ELEV. M. DESCRIPTION AND CLASSIFICATION WATER RETURN, so so 45 aORILLING, ETC.RUNE1 1.0 ,, * .. ...0.0___10 0 0.0.0.~0.0 F 774 52.3 64 5" 0-0 S ,m NAC HU FORMATION of the PLAITEVIJ=

GROW' Yellowish brown and pay. finely crystalline, ariliaceous.

thin bedded to massive, DOLOMITE w/some peloids and gray shale partih, occsional FeOX staiinn, vu and zones of fossils; minor fracturing (36 horizontal.

1 verticial 5 -TO degree) v/ black heavy MinealI WI"fuig and seConMdar calcite cemnent.-Same as above w/ few fractures (SO horisontal, I vertical & 2-70 degree-Same an above, but appears more Yuggy and-Lost circulation completely-Core blocked out-Smooth coring; no ,water return; drill rate: 0.35 ft/1-Smooth coring; no water return; drill rate: 0.33 ft/min (-'-4--RUN 7 10.0.01 83.O1 0.0 0 a;5

-North Central, Inc.0-Same an above w/ some bedding planes (11 horizontal).-Smooth coring-, no water return; drill rate: 0.50 ft/min GRAND DETOUR IORMLTION of the P.ATmV=X GROUP: Light and dark greenish ray argillaceous, mansiv., interfonmational conglomerate composed of clasta up to 0.1', in diameter in a ar'illaceous DOLOMITIC LIMON4E matrix w/ occasional black and dark gray shale partinp, few phosphatic nodules.moderately fractured (22 horizontal) wt pyrite and calcite oinflih , moderately fossiliferous.-Same am above but mottled light green and white clatam of coams sand to cobble size intaeformational conglomerate in a dark prm to blak argillaceous matrix.-Same as above w/ few fircture and bedding planes (22 horiontal, I vertical & s20 to 30 degree), occasional phoeptin*1 END OF BORING, 93.0'.Drilling fluid consisted of clear water from the Byron Municipal water supply.I XEROX TELECOPIER 295 ; 2-11-91. 2:25 PM;FEB-11-1991 14:27 708 940 9280 +TO 17,1229-44466-0-0 FROM M:M-NORTH C-ENTRPL.312294446

'# 3 P.-0,710 WELL CONSTRUCTION LOG AtD WURACE IT!.01 ft 4'.%9.'-,.0" BOREHOLE 440".- CASING Temporary 0.01-15.51 Bcs.-; 7_.R INCH DIAMETER DRILLED HOLE-WELL CASJNO 2.0 INCH DIAMETER PROJECT 7089RBECO-WELL PC -Q TOWN/CITY -V Byon--COUNTY Ocde_. STATE TL PERMIT NO. N/A LAND-SURFACE ELEVATION AND DATUM 829.29 feet E SURVE above MSL , EST1M, INSTALLATION DATE(S) 2/27/89 to 3/Z/e DRILLING METHOD Flight auger, .NX core, DRILWNO CONTRACTOR

-Fox Drillin., -r DRILING FLUID Clear water from Byron Munitinal Water Sninlv I.-Ij 0- S ACKFI 2 GROUT.82 t,.R BD4TONITE 8. i0a ft*volclay *t -200 gal.)-( SLURRY E3 PELLETS SNONE DEVELOPMENT TECXNIQUE(S)

AND DATE(.a/27/89 hand bailed FLUID LOSS DURING DRILUING_

_WATER REMOVED DURING DEVELOPMENT 8 STAlIC DEPTH TO WATER 86. Q ft*WELL SCRI 2.0 INC 4 SAN o=ZE FORI.COLI 16. fts.ft.SACKFILL 88.27 PUMPING DEPTH TO WATER N/A FEET BELOW FEET BELOW MEN H DIAMETER 10 SLOT ries steel VEL PACK D PACK 4ATION APSE PUMPING DURATION N/A HOUR YIELD N/A gprn DATE N/A SPFcIPIC CAPACITY N/A gpm/WELL PURPOSE table monitorinc, well REMARKS-Initial Water Level: 87.15' B0 ,-didn't use bentonite pellets for Se;-due to likely bridging in small Mro;: C BENTONITE*i SAND/GRAVEL II FORMATION MEASURING POINT IS TOP OF WELL CASING UNLESS OTHERWISE NOTED.-Tremied in volclay gront A PREPARED BY D.P. Edwards* DEPTH BELOW LAND SURFACE IERM -North Central, Inc.Environmental Resources Meent PROJECT PROJECT NUMBER SHEET NO. HOLE NO GEOLOGIC DRILL LOG DIRKS FARM 17089RBCECO I OF 5 PC-(SITE COORDINATES NGLE FROM MORIOBEARING DIRKS FARMI N 1974268; E 734469 1 Vertical I ......BEGUN COM4PLETED rRILLER RILLING EQUIPET BORING DIA. TOTAL DEP 2-27-89 3-2-89 Fox Drilling [ CME 75 w/ 4" Flight Auger & NX Core 1 4.0" 1 103.0 CORE RECOVERY (FT./%) kBw BOXES]SAI4PLES L. TOP CASING GROMU EL. :PIN/EL. GROUND WATER EPTH/EL. TOP OF ROCK 2.7/ 831.30 ! 829.3 I AT1 82.7/95 F 3 831. 8 86.21743.1 24-HouR 13.5/815.7 SAMPLE DEVICE CASING LEFT IN HOLE: DIA./LENGTN LOGGED BY: 2"x 2' Split Spoon and NX Core NONE D.P. Edwards~I~ ! *ý ' _ flu LAYER ELEV.DEPTH L I.829.3 I g-r 1 -Y --0I a N z a DESCRIPTION AND CLASSIFICATION NOTES ON: WAIER LEUELS, WATER RETURN, CHARACTER OF DRZLLING, ETC.Dark brown, CLAYEY FINE SAND w/rootleta and other organics, moist.SS-1 1.7 2.0 3 0.0 0.0 0.0 2 SS-2 1.6 2.0 4 0.0 10.0 0.0 2 2 SS3 1.2 2.0 7 0.0 0.0 0.0 M/6 826.3 3.0 822.8 6.5 817.8 11.5 815.8 13.5.,,,d Reddish brown, loose, well sorted, FINE SAND w/ traue day, moist.5-10-Mottled ligt and dark RBrwn, irni, moderately well sorted, CXAYEY SILT w/ trace fine sand, rootlets, wood, straw and other organics, FeOX stained, moist (Ios).I lagt brown, medum dense, moderately well sorted, CLAYEY FINE SAD, dry.1 is-RUN 3.8 7.S I 10.0 0.0 0.0.0.0 1 Buff, finely crystalline, massive, L TO M BIOSPMAR=IT faint horizontal bedding, fractured (14 horizontal, 5 vertical, 1-65 degree & 1-35 degree) w/ heavy mineral, clay and carbonate sand infillings, yuggy, sihtly fosiliferous w/ minor preferential dissolution of the skeletal fragments, thin clay partings, extensively weathlered to carbonate sand, gravel and clay at the top.-Auger refusal at 15.5' I-smooth coring, 9091 water return; drill rats 0.25 ft/min'I A. I I I r=

(k~{~ RM -North Central, Inc.-- --- i- ...S..- 0~-- I'smugenn R GEOLOGIC DRILL LOG PROJECT " PROJECT NUMER SHEET H0. IOLE NO.I_ DIRKS FARM 17089RBCECO 1 2 OF 5 1 16 LAYER WATER LEVELS,' _4 134J ' C ,LESCRIPTON NM CLASSITE O: 3 0 _4 L l L WTERRETURN, E Ji ý DEPTH C CHARACTrER OF.0 EO GO 1.u It MRLI RUI Ti a.9 10-9 -10.0 22*0f 0.0 0.0 0..0 5 2 803.7 25.6 xC y Yellowish brown and buff, horizontally bedded, KAuESTONS/DOLOMMr possibly colitic, considerable white and light brown chert nodules and cheut beds, few vup, exttenively frctured (39 horizontal

& 8 vertical) w/ heavy mineral and calcite infimag,.-Same as above w/ increased fossil and peloid content, clay partings, wavy bedding (alternating omues of borizontally bedded sandy bioqmrite and wavy bedded pelbiomicrite), some -ractu-es (28 horisontal and 5-15 degee).-Same an above w/ few white and light brown chert nodules and some fracture.~UN 0.0-.9 4-.0 1 75.01 0.0 I.0.0-Smooth coring-, no water return below 26'; drill rate: 0.2 ft/min-Core blocked out at 28.5' BGS-Smooth, slow coring;no water return; drill rate. 0.15 ft/min-Smooth coring; no water return; drill rate: 0.22 ft/win 35,/40.42.7 I .n ccI c n!I a 1 AV , I' IvU *.0.0-0.0 0.0 1 eflowish brown and buff, finely cryTtalline.

massive, fossiliferous, ITOWNIC/DOIOMIT w/ extensive vugs and yellow porous sones, fractured (33 IERM -North Central, Inc.t-J I-I 4.1.16 ~-'Is w a U ft 41-OA.r A.41 310 a01 L U I -4 M C'. EO. U ..a I a fa I Rm2N Q Buff, finely crystalline, massive L IPTOMN/DOLOMrT w/ sandy soue, wavy clay partings.

skeletal fragmen, and minor vuggines, few fracturms w/ minor heavy mineral and calcite Infiffings.-Same as above w/ some fractures (24 horisontal, 4 vertical &; 1-30 degree).1~LW TONE/DOLOnIrZ w/ horizontal and wavy black clay partings, large fossil fragments, few peloids and intraclasts, few vups and fractures (15 horisontal, 1 vertical, 1-60 degree and 3-10 degree), occasional highly porous beds of sandy or micritic carbonat.-Smoo~th, slow 0.13'I I~ ERM -North Central, Inc.0 GEOLOGIC DRILL LOG PROJECT PROJECT IlBER IS"EET NO. HNOLE NO.GEOLOGIC DDIRKS FARM ý7089RBCECO I 4 OF 5 aJ ~NOTES 014: 116 C CiU ILE ILAYER ,..NWATER LEVELS, a 3U0 I -4 M ELEV. IL I. DESCRIPTION AND CLASSIFZCATZON WATER RETURN, O O 0 ORZLLZNG, ETC._e I -- 2 _ _ _ _ _ _ _ _~.1-U4-100 O.9.0 0.0I-~*RUN 10.0 110.0 93.0 10.0 U.U 0.0 I 731.78;.3.0 7-5 so L'7 Mottled brown, reddish brown and gpay, finely cruytalline, mauive L2T01STIf

/D0oiw l wt few and wavy lautnne, fractures, vuag and hil porous beds, minor fondl content and ome F0OX accumulations along fracitures and vip-Same as above w/ fractures (21 horizontal

&1-70 degree).-Same an above w/ fractures (14 horizontal, 4-45 degree, 2-70 degree it 1-80 degree).II O.l 0.0 RUN 8110.0 110.C 77.0 10.0 10.0 0.0 85--Smooth, slow coting;no water return; drill rate: 0.14 ft/main-Smooth corinr. no water returm dril rate: 0.17 ft/min-Smooth coring; no water return; drill rate: 0.17 ft/min 90-7382 90.5==Gray, finely crystalline, massive LT r0NR iDOLOCrrE w/scan horizontal and wavy lminae, foesiliferous, some clay partings, preferential dissolution of skeletal fragments, some fractures (15 horizontal) and heavy mineral (pyrite) accumulations along fractures.

-1usEavirowmental gg2egutmg Mxn etleflt pftOJECT ROJECT KMWER ISHEEt 11O. HOLE NO GEOLOGIC DRILL LOG _DIRKS FARM 7OS9RBC.CO SOF 5 PC-1 R. c Con imnant -3 LDESCRIPTION AND LSIIAINNTSATRL'ES 10a. Mom DRLLNG ETC.b os0 Diniag fluid tonsisted of clewr wate from the Byron mumicipal wi~w supply.us STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-1 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 23, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON. ILLINOIS FIELD PERSONNEL:

S. POOLER DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE I BGS { BGS P --z z c-2-6-8-10-`12:-14 r16:-18-20-22-24-26-28:-30-32:-34-36-38 SP SAND (FILL) -trace of limestone gravel, medium grain, brown, dry Concrete 4" Borehole CementiBento Grout Rie END OF OVERBURDEN HOLE @ 9.0ft BGS I I-a C.)0.N a, zi I W-NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE 01 STRATIGRAPHIC AND INSTRUMENTATION LOG (BEDROCK)

Page 2 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-1 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 23,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

S. POOLER DEPTH DEPTH a DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS Monitoling Well 0 >-ftBGS ft BGS W WE" n M W LU z W-10-12-14-16 18-20 1-22-24-26-28-30-32-34-36-38 40-42 44 46 9.00 WEATHERED DOLOMITE -fissured, fractured, light brown, wet I Elm 11, 1/0'X No 2" PVC Well Casing Cement/Bent:

Grout 0 ,ite 8 CL (4 e L)0 0 Wi ~NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE Co.

(i ) STRATIGRAI PROJECT NAME: EXELON-BYRON PROJECT NUMBER: 19232-21 CLIENT: EXELON GENERATION COMPANY LLC LOCATION:

BYRON, ILLINOIS PHIC AND INSTRUMENTATION LOG (BEDROCK)HOLE DESIGNATION:

AR-1 DATE COMPLETED:

March 23, 2006 DRILLING METHOD: SONIC FIELD PERSONNEL:

S. POOLER Page 3 of 3 4 STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH ft BGS Monitoring Well 4. +of z'tzw 0>wu n, 0 cr 4- 4-2" PVC Well Screen Sand Pack 4 I 70.00 END OF BOREHOLE @ 70.Oft BGS WELL DETAILS Screened interval: 50.00 to 70.00ft BGS Length: 20ft Diameter:

21n Slot Size: 0.010 Material:

PVC Sand Pack: 47.00 to 70.0011 BGS Material:

  1. 2 Sand 4 MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE si STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-10 PROJECT NUMBER: 19232-21 DATE COMPLETED:

April 5, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSAJAIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE ft BGS ft BGS z _z J. I I..I UNCONSOLIDATED SEDIMENTS 42-4-6-8"10-12-14-16 18-20-22-24-26-28-30-32-34-36-38 Rk 101/'-Concrete-Cement/Bento Grout-rPVC Well Casing 9' Borehole from 0-19p Bentonite Chips ite LIMESTONE

-weathered-competent rock at 19.0ft BGS 15.00 29.00 4E fron 5cr, San WELL DETAILS Screened interval: 19.00 to 29.001t BGS Length: 10ft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 17.00 to 29,00ft BGS Material:

Sand Borehole n 19-29'WVC Well een nd Pack S a END OF BOREHOLE @ 29.Oft BGS 0 0 0.o zw NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 4 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-11 f PROJECT NUMBER: 19232-21 DATE COMPLETED:

April 11, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

E. VARNAS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH SAMPLE ft BGS ft BGS R onn Well w ,, ,, >zC- -M -f 4-6-8-10-12 14"16-18-20-22-24-26-28-30-32-34-36-38 UNCONSOLIDATED SEDIMENTS 8.00 BEDROCK -gray limestone gW, 10/1, 011///11,0 FBI-Concrete 6" Borehole from 0-8'CementlBento Grout 4" Borehole from 8-1505'-2" PVC Well Casing ite El to (L 4 I z~LJ_____

.NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE W.

STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 4 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-i 1 PROJECT NUMBER: 19232-21 DATE COMPLETED:

April 11, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

E. VARNAS DETEIPTH SAMPLE DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS fEPTH Monitoring Well ft BGS t BGS..~~ ,, -co,0 Mw>'M uj >i-42-44-46-48-50-52 54-56-58-60-62-64-66-68-70-72-74-76-78-4" Borehole from 8-150.5'CL 0.-some red color at 70.Oft BGS-gray color at 74.0ft BGS-red color at 78.0ft BGS in ca w NOTES: MEASURING POINT ELEVATIONS MAY CHANGE: REFER TO CURRENT ELEVATION TABLE 1qw STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-11 PROJECT NUMBER: 19232-21 DATE COMPLETED:

April 11, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

E. VARNAS Page 3 of 4 I STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH ft BGS Monitoring Well I I w Co z-J w SAMPLE IJJ C., w cr Z I I-4" Borehole from 8-150.5'-1' of gray color at 106.0ft BGS I I I z5 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO

(§) STRATIGRAI PROJECT NAME: EXELON-BYRON PROJECT NUMBER: 19232-21 CLIENT: EXELON GENERATION COMPANY LLC LOCATION:

BYRON, ILLINOIS PHIC AND INSTRUMENTATION LOG (OVERBURDEN)

HOLE DESIGNATION:

AR-i 1 DATE COMPLETED:

April 11,2006 DRILLING METHOD: AIR ROTARY FIELD PERSONNEL:

E. VARNAS Page 4 of 4 DEPTH MSAMPLE STRATIGRAPHIC DESCRIPTION

& REMARKS TMonitoring Well ftBGS wi uJ I U.1 FR I PON-etoi Chips-4" Bor from 8 2- PV(Scree, Sand I Screened interval: 139.50 to 149.50tl BGS Length: loft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 136.00 to 150.50ft BGS Material:

Sand nie ehole-1505'C Well n Pack SHALE END OF BOREHOLE @ 150.5ft BGS 150.00 150.50 i5 CL NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (§ ) (OVERBURDEN)

Page 1 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-2 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

S. POOLER DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE ft BGS ft BGS o- "ng el_u1 ' I-- = ,,oto WE-T = 4-6-8-10-12-14-16"18-20-22-24-26-28-30-32 34 36-38 SM SILTY SAND -with fine gravel, compact, fine grained, poorly graded, brown, moist DOLOSTONE

-fissured, fractured, light brown END OF OVERBURDEN HOLE @ 20.0ft BGS 10.00 hWAQ LIT 6= Borehole 2* PVC Well Casing Concrele-Cement(Bento iite I II 4" Borehole from 10-81'0.9 Q, 9 L)1 D, W NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (BEDROCK)

Page 2 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-2 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

S. POOLER DEPT DETHI fT STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well ftBGS ft BGS tu ujiE D8 >}Z n,__ 0V _I zwoj ___'-20-22-24-26 28-30-32-34-36-38-40 42-44-46-48-50-52-54-56 4- 4" Borehole from 10-81'(-0 0 ()N 0l ft 0 C)NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE-.m m w STRATIGRAPHIC AND INSTRUMENTATION LOG (BEDROCK)

Page 3 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-2 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

S. POOLER DEPTH DPTH- ____fT BGS STRATIGRAPHIC DESCRIPTION

& REMARKS E PGS Monitorng Well z n-___IZI-60-62 64-66-68-70 72-74-76-78-80-82-84-86-88 90-92-96-wet at 65.0t BGS-wet at 75.Oft BGS 4" E" " fron 2-F San WELL DETAILS Screened interval: 71.00 to 81.00fI BGS Length: loft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 68.00 to 81lO0ft BGS Material:

  1. 2 Sand lorehole 10-81'IVC Well sen id Pack 81.00 END OF BOREHOLE @ 81.Oft BGS 4 4l 0)c4 I Ct A I.0 NOTES; MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE Co .

STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-3 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 22, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

S. POOLER Page 1 of 3 DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS ft BGS SAMPLE Monitoring Well-2-4-6-8-10-12-14-16-18-20-22 24-26-28-30-32-34-36-38 SM SILTY SAND -with fine gravel, compact, fine grained, poorly graded, brown, moist END OF OVERBURDEN HOLE @ 11.0ft BGS--EM KS V I-0.0 a ii- --_____LI -Lz.L......

(0 ,,;t NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE NW STRATIGRAPHIC AND INSTRUMENTATION LOG (BEDROCK)

Page 2 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-3 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 22,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

S. POOLER DEPTH ET fT STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Wl rJ ft BGS ft BGS Monitoring Well wr D 0 w-12-14-16-18 20-22-24-26-28-30-32-34-36-38-40-42-44-46-48 DOLOSTONE

-fissured, fractured, light brown 11.00-4" Borehole 1-l I.-a 0 0~0 C, 0.C, SI C, 41 LU NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE ca STRATIGRAPHIC AND INSTRUMENTATION LOG (BEDROCK)

Page 3 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-3 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 22,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: SONIC LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

S. POOLER DET _ _ _ _ _ _ _ _ _DEPTH ___ ___DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS Monitorng Well x, >-ft BGS *'rerun" J _a____w...w 4u08____~~~~~~~

~~~~ __ _ _ _ _ _ __ _ _ _ _ _ _ __ _ _ _ __ _ _ _ w_ _4- ___-52-54-56-58-60-62-64-66 68-70 72-74-76-78-80-82-84-86-88 Car Gro 2F Scri WELL DETAILS Screened interval: 60.00 to 70.0Oft BGS Length: 10ft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack 57.00 to 71.00ft BGS Material:

  1. 2 Sand nentlBentc ut lorehole VC Well een d Pack lite-wet at 65.0ft BGS 71.00 END OF BOREHOLE @ 71.0ft BGS I-0 0.a: 0 0 0 a.a Y-.1-_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _C-, 0 a: 0 LU NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE w STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-4 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 24, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

N. KUHL DPHDEPTH SAMPLE DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS fT Monitoring Well ft BGS ft BGS n "~z z " .I 2-4-6-8-10-12-14 16-18-20 22 24 26-28-30-32-34-36-38-40-42--44 UNCONSOLIDATED SEDIMENTS (see logs for TW-7 and TW-8)BEDROCK-competent rock at 12.0ft BGS 8.00/0011 o 1 71 IX/Concrete-Bentonite Grout ,2 PVC Well Casing 6" Borehole from 0-12'4" Borehole from 12-121.5 i I-0 CD 0.C.)CD N C., 0S z 4 I 0 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE PROJECT NAME: EXELON-B'STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 3 YRON PROJECT NUMBER: 19232-21 CLIENT: EXELON GENERATION COMPANY LLC LOCATION:

BYRON, ILLINOIS HOLE DESIGNATION:

AR-4 DATE COMPLETED:

March 24, 2006 DRILLING METHOD: AIR ROTARY FIELD PERSONNEL:

N. KUHL a STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well ' SAMPLE ft BGS w I >Ir k__________________

__. ,,,<-Cerrent/Bentatlite 4' Borehole from 12-121.5 S a NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE 1q1w STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 3 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-4 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 24, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

N. KUHL DPHDEPTH SAMPLE DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS D Monitoring Well SAMPLE ft BGS ft BGSr D, I- w 3 z z L I-92-94-96-98 100 102-104-106-108-110-112-114-116-118-120-122-124-126-128-130-132-134 Bentg Chips fromi 2" PV Scrnf Sand WELL DETAILS Screened interval: 99.50 to 1 19.50ft BGS Length: 20ft Diameter.

2in Slot Size; 0.010 Material:

PVC Sand Pack: 95.50 to 121.50fl BGS Material:

Sand onite 12-121.5 qC Well 1 Pack E 121.50 END OF BOREHOLE @ 121.5ft BGS 0-0 E_____ zL JI.....0NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE 0wi I.STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-5 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 23, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

N. KUHL EPHDEPTH SAMPLE fT BGS STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring WellS fBft "-SMn W Lu W >D _-_-" z n 2-4-6-8-10-12-14 16 18 20 22 24 26 28 30 32-34-36-38-40-42-44 UNCONSOLIDATED SEDIMENTS (see logs for TW-9 and TW-10)3.50 BEDROCK -weathered, gray limestone-competent rock at 12.0fi BGS Concrete Cement/Bento Grout ,- 6' Borehole from 0-12'-2' PVC Well Casing 4" Borehole from 12-122'i~e 0 C4, 0.S, C-: Uji ~ __________

0,, NOTES_ MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-5 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 23,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

N. KUHL DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE ft BGS ft BGS MoirngWl z z 0:-46-48 50-52-54-56-58-60-62-64-66-68-70-72-74-76-78-80-82-84 r86-88 0- 4" Borehole from 12-122'-gray-brown at 62.Oft BGS 41 41 0 IL 0 0 z a uJ A>NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE

STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Pag 1 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-6 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON. ILLINOIS FIELD PERSONNEL:

E. VARNAS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE ft BGS ft BGS 1---- 5 _I 2-4-6-8-10-12 14-16-18-20 E-22-24-26-28-30-32-34-36-38-40-42-44 UNCONSOLIDATED SEDIMENTS (see logs for TW-11 and TW-12)Concrete BEDROCK-competent rock at 12.0fi BGS 8.00'- Cement/Bentoi Grout 6" Borehole from 0-12'2" PVC Well Casing 4' Borehole from 12-122'1C de l I-C, 0.C'4 z 4 Ii NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE L STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-6 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

E. VARNAS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Well SAMPLE ft BGS ft BGS M zB g z-46-48-50-52-54 i 56-58-60-62-04 066-68 170-72-74-76-78-80-82-84-86-88 4" Borehole from 12-122'Cement/Bentc Grout-Bentonite Chips Mte a a: z g 0~0 CD 0 z LU U'0 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE'RW STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-6 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

E. VARNAS Page 3 of 3 E I STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH SAMPLE ft BGS Monitoring Well z z I from!Z' P, Scre-San(WELL DETAILS Screened interval: 95.00 to 115.00ff BGS Length: 2Ott Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 85.00 to 122.00ff BGS Material:

  1. 6 Sand Drehole 12-122'/C Well en d Pack 4l 4 122.00 END OF BOREHOLE @ 122.0ft BGS w5 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-7 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 28, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON. ILLINOIS FIELD PERSONNEL:

B. WILLIAMS Page 1 of 3 S STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE ft BGS X -o nw.1 z -z "X .SP SAND/GRAVEL FILL SC CLAYEY SAND 15.00 17.00 BEDROCK LIMESTONE

-weathered-competent rock at 20.Oft BGS.4.: 7 Cement/Bento Grout 2" PVC Well Casing 4-- 4" Borehole from 20-113'Ike 0- 9" Borehole from 0-20'-Concrete A&MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE 1L -DU STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-7 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 28,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH DPTH SoioigWl AMPLE ftBGS STRATIGRAPHIC DESCRIPTION

& REMARKS BET Monioring Well SAM- P. L D ~ I.z z M -Z-42-44-46-48-50-52 54-56-58-60-62-64-66-68-70 72 74-76-78-occasional sand pockets from 60-79' at 60.0ft BGS II II II C-0 (z z 0 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE w'C STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 3 of 3 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-7 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 28,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON. ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTHSAMPLE DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SML ft BGS ft BGS ,,,_________uJ z z .k-82-84-86-88 90 92=94:-96ý-98-100-102-104 106-108:-110-112-114-116-118 Bentonite Chips 0 C.)01 Q-2" PVC Screen Sand F WELL DETAILS Screened interval: 102.00 to 113.00ft BGS Length: 1lift Diameter.

2in Slot Size: 0.010 Material:

PVC Sand Pack: 100.00 to 113.00ft BGS Material:

iA Sand Welt'ack S 0 END OF BOREHOLE @ 113.0ft BGS 113.00 I NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE w STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-8 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 31, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSNAIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE ft BGS ft BGSn" ._u_____ ___ ___ ____ ___ ___ ___ _ __ _ _ ___ _ >I GPS SAND/GRAVEL (FILL)-2-4-6-8 10-12"14-16-18-20-22-24-26-28 B-3 0-32-34-36-38 2.00 LIMESTONE

-weathered-competent rock at 5.Ofi BGS.'.-Concrete-9" Borehole from 0-5'0- 4 Borehole from 5-53'-Cement/Bentc Grout-2" PVC Well Casing-Bentonite Chips-2" PVC Well Screen-Sand Pack lite C C S I-0 9 a-cc g a-9 2 Li-C cc w I NOTES: MEASURING POINT ELEVATIONS MAY CHANGE: REFER TO CURRENT ELEVATION TABLE E 0-I STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-8 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 31, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSANAIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS Page 2 of 2 STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH ft BGS Monitoring Well+w.-J i-z SAMPLE T w U-4 -4.-4" Borehole from 5-53'53.00 END OF BOREHOLE @ 53.Ofl BGS WELL DETAILS Screened interval: 30.00 to 50.00ft BGS Length: 20ft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 28.00 to 53.00ft BGS Material:

Sand ai MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE 111111 STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page I of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-9 PROJECT NUMBER: 19232-21 DATE COMPLETED:

April 4, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSANAIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitoring Well SAMPLE It BGS ft BGS Moiorn Wl.................... ....-2-4-6-8-10-12-14-16 18 ,20 22 24 26 28 30 32 34 36-38 UNCONSOLIDATED SEDIMENTS BEDROCK -weathered-competent rock at 25.0f1 BGS 20.00 VON Im z V11 FRFBI101 Cement/Bento Grout-- 9" Borehole from 0-25'2" PVC Well Casing 0- 4' Borehole from 25-68'4 I Rie 0 z 8 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

AR-9 PROJECT NUMBER: 19232-21 DATE COMPLETED:

April 4, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSA/AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Monitong WellSAMPLE ft BGS fBGS M g --, zw z z z-42-44-46-48-50-52-54-56 58-60 62-64-66-68-70-72 74-76-78 y v-4" Borehole from 25-68'-Bentonite Chips 2"P Scre San WELL DETAILS Screened interval: 55.50 to 65.50ft BGS Length: 10ft Diameter:

2in SlotSize:

0.010 Material:

PVC Sand Pack: 54.00 to 68.0Oft BGS Material:

  1. 6 Sand VC Well een d Pack 68.00 END OF BOREHOLE @ 68.Oft BGS (-z ah mj A NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE NW I STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page I of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

CAR-1 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS Monitoring Well SAMPLE t BGS ft BGS-0 --J-2-4-6-8 10"12-14-16-18-20-22-24-26-28-30-32-34-36-38 SP SAND. -fine graineo, trace medium sand, poorly graded. medium brown, moist-some coarse sand, dark brown at 11.2ft BGS-trace fine gravel at 1 5.0ft BGS-some fine gravel at 20.0ff BGS-wet at 27.Oft BGS.4.: 5...4.:.4.: 5.: 4-s-Concrete OF- 8" Borehole El-Cement/Bento iite I-.C 0 C., 0.C)z E1 2" PVC Well Casing 0 Ix D NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

CAR-1 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 21,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS S DEPTH ft BGS STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH ft BGS Monitoring Well.4 .4 IJ z SAMPLE-J.42:-44-46-48-50-52-dense at 50.0ft BGS 55.00 END OF BOREHOLE @ 55.0ft BGS 0 WELL DETAILS Screened interval: 45.00 to 55,00ft BGS Length: lOft Diameter:

2in Slol Size: 0.010 Material:

PVC Sand Pack.43.00 to 55.00ft BGS Material:

Sand 0 F_I. __________

A ___________________________________

L...1.....I..........1..........j

___________

iONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE w-IONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE Iqqw STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

CAR-2 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 22. 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: 4-1/4" HSN4" ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH DEPTH SAMPLE Dt BGS STRATIGRAPHIC DESCRIPTION

& REMARKS ft BGS Monitoring Well SAMPLE R G tBSIt -.J 4-w >D SP SAND-2-4-6-8 10-12-14-16-18-20-22-24-26-28-30-32 34-36-38 NEN K- Concrete 9" Borehole 2" PVC Weon Casing Cement/Bento Grout tite E I END OF OVERBURDEN HOLE @ 20.Oft BGS U3 z I w C Si NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE

(§) STRATIGRAF PROJECT NAME: EXELON-BYRON PROJECT NUMBER: 19232-21 CLIENT: EXELON GENERATION COMPANY LLC LOCATION:

BYRON, ILLINOIS PHIC AND INSTRUMENTATION LOG (BEDROCK)Page 2 of 2 HOLE DESIGNATION:

CAR-2 DATE COMPLETED:

March 22,2006 DRILLING METHOD: 4-114" HSA/4" ROTARY FIELD PERSONNEL:

B. WILLIAMS calcareous nodules 36.50 23.00 to 36.50ft BGS aterial: Sand STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

CAR-3 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 29, 2006 I CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH SAMPLE ft BGS SftBGS Monitorng Wel-uJ > IlD w____ z oIz __0 UNCONSOLIDATED SEDIMENTS-2-4-6 8-10 12 14-16-18 20 22 24 26 28-30-32 34-36-38 WEATHERED LIMESTONE BEDROCK 19.00 a4.10/1" Cemen/Bento Grout 9" Borehole from 0-25'2" PVC Well Casing Centanite Ifte F1-Concrete ai-0.(L z 4 C -~ J ~ -Luj i r I I z 0 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 2 of 2 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

CAR-3 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 29, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: AIR ROTARY LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

B. WILLIAMS DEPTH DEPTH SAMPLE DT GS STRATIGRAPHIC DESCRIPTION

& REMARKS T Monitoring Well ft BGS ft BGB MoioigWl z z "r-42-44-46-48-50-52 54-56-58 60-62 64 66-68-70-72-74-76-78 4 ..w fror Scr Sar WELL DE TAILSa Screened interval: 43.0010o63.00lt BGS Length: 20111 Diameter:

2in So Size: 0.010 Material:

PVC Sand PacW.40.00 to 63.00ft BGS Material-

  1. 5 Sand Borehole n 25-63" PVC Wel een nd Pack S S a END OF BOREHOLE @ 63.0ft BGS 63.00 0-0 CD NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE w STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-1 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 27, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-114" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT Page 1 of 1 4 DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS It BGS-2-4-6-8-10-12-14-16-18 TOPSOIL SP SAND (FILL) -trace limestone gravel, medium.grain, brown, dry LIMESTONE

-sandy and silty, weathered, brown, dry-AUGER REFUSAL at 8.5ft BGS-GEOPROBE REFUSAL at 9.0ft BGS I I END OF BOREHOLE @ 9.0it BGS END OF BOREHOLE @ 9.0ff BGS WELL DETAILS Screened interval: 3.50 to 8.50ff BGS Length: 5f1 Diameter:

21n Slot Size: 0.010 Material:

PVC Sand Pack: 2.50 to 8.50ft BGS Material:

Sand 4 4 I 3E; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-10 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 1, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-114" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH DEPTH SAMPLE ft BGS STRATIGRAPHIC DESCRIPTION

& REMARKS fGSP Temporary Well SAMPLE z z.I 1 1 *1.... ..I 1 -WI 1 1 S TOPSOIL-2-4-6-8-10-12-14-16-18-20-22-24-26-28'30-32 34 36 38 CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND -medium grain, brown, dry 1.00 3.00 7.00 8.00 WEATHERED LIMESTONE

-sandy, silty, brown, dry-AUGER REFUSAL at 7.5ft BGS-RFI=FJRAI ,t R (Ift B C 2-S WELL DETAILS Screened interval: 2.50 to 7.50f1 BGS Length: 5ft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 1.50 to 7.50ft BGS Material:

Sand enlonite hips PVC Well asing Borehole PVC Well Green and Pack 1GP 2GP 0.0 0.0/END OF BOREHOLE @ 8.Oft BGS I a I-0 0 0 C., C.)a-0_________

I __________

I. .L....,.J.........1.,L......L

_________

5 a0 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-1 1 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 1, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-1/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH SAMPLE ft BGS ft BGS Temporary Well W i UJ 0__ __ _____ ___ _ -TI _ _ _ 2z~II-2-4-6-8 10"12-14-16 18-20-22-24-26 28 1-30-32-34-36-38 TOPSOIL CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND -medium grained, brown, dry 1.00 4.50 9.00 10.00 Be Ch 2" Ca 2" Sc Sa WELL DETAILS Screened interval: 5.00 to 10.00ft BGS Length: 5ff Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 4.00 to 10.00ff BGS Material:

Sand'ntonite lips PVC Well=sing Borehole PVC Well reen nd Pack toP 0.0 0.0 WEATHERED LIMESTONE

-sandy, silty, brown, dry-GEOPROBE REFUSAL at 9.0ft BGS-AUGER REFUSAL at 10.0ff BGS[I END OF BOREHOLE @ 10.0ft BGS El 0 CL 0: 01 4 I._________

L I _________

J ________________________________

_________nt ,,w NOTES: MEASURING POINT ELEVATIONS MAY CHANGE: REFER TO CURRENT ELEVATION TABLE STRATIGRAI PROJECT NAME: EXELON-BYRON PROJECT NUMBER: 19232-21 CLIENT: EXELON GENERATION COMPANY LLC LOCATION:

BYRON, ILLINOIS PHIC AND INSTRUMENTATION LOG (OVERBURDEN)

HOLE DESIGNATION:

TW-12 DATE COMPLETED:

March 1, 2006 DRILLING METHOD: GEOPROBE/4-1/4" HSA FIELD PERSONNEL:

R. AAMOT Page 1 of I1 S DEPTHSAMPLE STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAM1LE f ,BGS cr -=__ _ _ __ _ _ __ _ _ __ Ir z -Z C TOPSOIL CL CLAY (FILL) -sandy, low plasticity, moist SP SAND -medium grained, brown, dry 1.00 4.50 9.00 12.00 i Bentonite Chips 2" PVC Well Casing 1GP 2GP 0.0 0.0 WEATHERED LIMESTONE

-sandy, silty, brown, dry-GEOPROBE REFUSAL at 9.Oft BGS--Al IfCO OrCHCI 10.1 e' (V] Qf`.0 2" Sc Sa WELL DETAILS Screened interval: 7.00 to 12.O0ft BGS Length: 5ft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 5.50 to 12.00ft BGS Material:

Sand Borehole PVC Well reen nd Pack END OF BOREHOLE @ 12.0ft BGS in NOTES: MEASURING POINT ELEVATIONS MAY CHANGE: REFER TO CURRENT ELEVATION TABLE'ROW STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-13 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 1.2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-1/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAMPLE ft BGS ft BGS Xeprr Well CL.__ z cc E_TOPSOIL go CL CLAY -sandy, low plasticity, brown, moist 1.00 1GP 0.0 Bentonite Chips-4 SP SAND -medium grain, brown, dry'S2" PVC Well 6 Casing 2GP 0.0 8 GC CLAYEY GRAVEL (limestone)

-sandy, 8.00 orange/brown, dry"10 SP SAND -medium grain, brown, dry 10.00 3GP 0.0 12 -GEOPROBE REFUSAL at 12.Oft BGS 8"Borehole

-14 2" PVC Well-satumated at 15.0ft BGS Sre-16SadPc 18 --AUGER REFUSAL at 18.Oft BGS I- 18.00 END OF BOREHOLE @ 18.Oft BGS WELL DETAILS Screened interval:-20 13.00 to 18.00ft BGS Length: 5fS Diameter; 2in-22 Slot Size: 0.010 Material:

PVC Sand Pack:-24 11.00 to 18.00ft BGS Material:

Sand-26-28 30-32 0-0-34 9-36 38 z LC: 0 NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE WATER FOUND STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-14 PROJECT NUMBER: 19232-21 DATE COMPLETED:

April 5, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBEJ4-114 HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH SAMPLE ft BGS ft BGS Temporary Well f a , CI.__~~~~~ ~~ __ _ _ _ _ _ _ _ __ _ _I_2-4-6-8 10 12-14-16-18-20-22-24-26-28-30-32-34-36-38-40-42 TOPSOIL CL CLAY -sandy, low plasticity, brown, moist SP SAND -medium grained, brown, dry-moist at B.5ft BGS GC CLAYEY GRAVEL (limestone)

-sandy, orange/brown, moist-interbedded layers of sand at 21.Oft BGS-weathered sandstone pieces mind in medium grained, green/gray at 24.0f1 BGS-GEOPROBE REFUSAL at 25.0ft BGS 1.00 4.00 13.00 34.00 F011 100/11 100/1" NO Concrete IGP--CementfBento do Grout-2" PVC Well Casing-Bentonite Chips 30P 4GP 0.0 0.0 0.0 0.0 0.0 0 I-0 a.g a.C, Oi@1 Scg Sar WELLDETIALS Screened interval: 24.00 to 34.00f1 BGS Length: 10ff Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 22.00 to 34.0011 BGS Material:

Sand Borehole PVC Well nee nd Pack S a END OF BOREHOLE @ 34.0ft BGS Uj LU A NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page I of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-15 PROJECT NUMBER: 19232-21 DATE COMPLETED:

March 1, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBEI4-1r HSA LOCATION:

BYRON. ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAMPLE It BGS ft BGS ?_ Lu-Tnfz z n I-2-4-6-8 10-12-14-16-18 20-22-24-26-28-30-32-34-36-38 TOPSOIL SP SAND -medium grained, brown, moist-increasing clay with depth at 14.Oft BGS Cl CLAY -silty, medium plasticity, brown, moist SP SAND -medium grained, brown, moist GC CLAYEY GRAVEL -sandy, light brown, saturated-GEOPROBE REFUSAL at 29.Oft BGS-AUGER REFUSAL at 30.Oft BGS 1.00 16.00 16.00 25.00 yv sentonite Chips-2 PVC Well Casing IGP 2GP 3GP 4GP 5GP toP 0.0 0.0 On El e-P Scn-San WELL DETAILS Screened interval: 24.00 to 29.0Oft BGS Length: 51t Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 22.00 to 29.00fI BGS Material:

Sand 0.0 0.0 0.0 lorehole'VC Well DPen d : Pack Qi z-30.00 END OF BOREHOLE @ 30.Oft BGS is NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE 0 0 STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of I PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-2 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 27,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-1/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAMPLE fP BGS f( BGS tempflmstnWrvl

,,,E z E W.S TOPSOIL-2 4 L6-8 10-12 14-16-18-20-22-24-26-28-30-32-34-36-38 SP SAND (FILL) -trace of limestone gravel, medium grain, brown, dry-AUGER REFUSAL at 7.0f BGS 1.00 8.00 9.00 C 2 C 2 S S WELL DETAILS Soreened interval: 2.00 to 7.001f BGS Length: 511 Diameter.

2in Slot Size: 0.010 Material:

PVC Sand Pack: 1.50 to 7.00f1 BGS Material:

Sand entonite hips"PVC Well asing Borehole PVC Well creen and Pack 1GP 2GP 0.0 0.0 WEATHERED LIMESTONE

-sandy, silty, brown, dry/--GEOPROBE REFUSAL at9 BGS END OF BOREHOLE @ 9.0fi BGS 0.0 0 z b NOTES: MEASURING POINT ELEVATIONS MAY CHANGE: REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-3 4 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 28,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-i/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAMPLE ft BGS It BGS T u g rh 1It z~TOPSOIL-2-4-6-8-10-12 14-16-18-20-22-24-26-28-30-32-34-36-38 CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND -medium grain, brown, dry-moist at 8.5ft BGS WEATHERED LIMESTONE

-sandy, silty, brown, dry S GEOPROBE REFUSAL at 9.Oft BGS-AUGER REFUSAL at 10.Sft BGS 1.00 4.00 9.00 10.50 Be 2" Sc Sa WELL DETAILS Screened interval: 5.50 to 10.50ft BGS Length: 5ft Diameter.

2in Slot Size: 0.010 Material:

PVC Sand Pack: 4.50 to 10.50fI BGS Material:

Sand ntonite lips PVC Well asing Borehole PVC Well teen nd Pack 101'201'END OF BOREHOLE @ 10.5ft BGS 0.0 0.0 I a.c-0 I v of NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE cr wj 0.

STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-4 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 28, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-114" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT Page 1 of 1 STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAMPLE ft BGS TemW zo Z; 0 .z z z TOPSOIL CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND -medium grain, brown, dry 1.00 4.00 9.00 10.50 Ca 8"1 2"1 WELL DETAILS Screened interval: 5.50 to 10.50ff BGS Length: 5ff Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 4.50 to 10.50ff BGS Material:

Sand ntonite ips PVC Well sing Borehole PVC Well teen nd Pack IGP 2GP 0.0 0.0 WEATHERED LIMESTONE

-sandy, silty, brown, dry-GEOPROBE REFUSAL at 9.0ft BGS-AUGER REFUSAL at 10.5ft BGS jr END OF BOREHOLE @ 10.5ft BGS 0 a ill NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-5 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 28, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBEI4-1/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT Page 1 of 1 I DEtTH STRATIGRAPHIC DESCRIPTION

& REMARKS ft BGS-2-4-6-8 10-12 14-16-18-20-22-24-26-28-30-32-34-36-38 TOPSOIL CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND -medium grain, brown, dry* -GEOPROBE REFUSAL at 8.Oft BGS-AUGER REFUSAL at 8.Oft BGS END OF BOREHOLE @ 8.0ft BGS WELL DETAILS Screened interval: 3.00 to 800ft BGS Length: 5ff Diameter.

2in Slot Size: 0.010 Material:

PVC Sand Pack: 2.00 to 8.00ff BGS Material:

Sand E W-0 8 r. _________

L ________________________________

__________

ZI)NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of I PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-6 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 28,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-114" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH SAMPLE ft BGS Cft BGS Temporary Well WU ag d z z , z 5--2-4-6-8-10-12-14 TOPSOIL CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND -medium grain, brown, dry 1.00 4.00 8.50 B WELL DETAILS Screened interval: 3.50 to 8.50ff BGS Length: 5ff Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 2.50 to 8.50ff BGS Material:

Sand 3entonifteWellýasing"Borehole.,PVC Well and Pack 11W 2GP 0.0 0.0-GEOPROBE REFUSAL at 8.5ft BGS-AlGER REFUSAL at R5ff BGS F q END OF BOREHOLE @ 8.5ft BGS S a QTE$: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE hw-STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-7 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 28, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-1/4" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAMPLE ft BGS Ift BGS no uJ z IX a -M Lu-2-4-6-8 10-12"14-16-18-20-22-24-26-28 30-32-36-38 TOPSOIL CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND, medium grain, brown, dry 1.00 3.50 9.50 11.00 Bentonite Chips 2" PVC Well Casing A 2"PVC Well Screen Sand Pack WELL DETAILS Screened interval: 6,00toll00ftsBGS Length: 5f1 Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 5.00 to 1.00ft BGS Material:

Sand IGP 0.0 0.0 4 CL CLAY -sandy, low plasticity, brown, moist-GEOPROBE REFUSAL at 9.5ft BGS-AUGER REFUSAL at 11 Oft BGS I END OF BOREHOLE @ 11.0ft BGS I C5 C, z l NOTE_: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE S.' I STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-8 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 28,2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-114" HSA LOCATION:

BYRON, ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH STRATIGRAPHIC DESCRIPTION

& REMARKS DEPTH Temporary Well SAMPLE ft BGS ft BGS e We-Tz f 3 z TOPSOIL-2-4-6-8 L10-12-14-16-18-20 CL CLAY (FILL) -sandy, low plasticity, brown, moist SP SAND -medium grain, brown, dry 1.00 3.50 9.50 SBentonite Chips 2- PVC Well Casing 0.0 0.0 CL CLAY -sandy, low plasticity, brown, moist-GEOPROBE REFUSAL at 9.5ft BGS-- -AUGER REFUSAL at 12.0fftBGS 12.00 END OF BOREHOLE @ 12.0ft BGS* "" ', " 2" 1 Sc.;- 55 WELL DETAILS Screened interval: 7.00 to 12.008 BGS Length: 5ft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 6.00 to 12.0011 BGS Material:

Sand Borehole PVC Well reen nd Pack 2GP 0 A __________

.1. __________________________________

EVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE w-EVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE I STRATIGRAPHIC AND INSTRUMENTATION LOG (OVERBURDEN)

Page 1 of 1 PROJECT NAME: EXELON-BYRON HOLE DESIGNATION:

TW-9 PROJECT NUMBER: 19232-21 DATE COMPLETED:

February 28, 2006 CLIENT: EXELON GENERATION COMPANY LLC DRILLING METHOD: GEOPROBE/4-1/4" HSA LOCATION:

BYRON. ILLINOIS FIELD PERSONNEL:

R. AAMOT DEPTH SRTGAHCDSRPIN&RMKS DEPTH Tepry Well SAMPLE ft BGS ft BGS ,,." =I -' z....... !I-2-4-6 B-8 10-12 14-16-18-20-22-24-26 28-30-32 34-36-38 TOPSOIL CL CLAY (FILL) -sandy. low plasticity, brown.moist SP SAND -medium grain, brown, dry 1.00 3.00 7.00 8.00 WEATHERED LIMESTONE

-sandy, silty, brown, dry-GEOPROBE REFUSAL at 8.0ft BGS-AUGER REFUSAL at 8.Oft BGS B C 2-C S WELL DETAILS Screened interval: 3-00 to 8.0011 BGS Length: 5ft Diameter:

2in Slot Size: 0.010 Material:

PVC Sand Pack: 2.00 to 8.00ft BGS Material:

Sand entonite hips I PVC Well asing-Borehole PVC Well croen and Pack 261'F 0.0 0.0 4 END OF BOREHOLE @ 8.0ft BGS a I-a C 0.0 C)a C, N OC 1_________

A L ________________________________

__________

Lu NOTES: MEASURING POINT ELEVATIONS MAY CHANGE; REFER TO CURRENT ELEVATION TABLE Byron Environmental Audit -Request for Additional Information Response Question #: WR-GW-1 Category:

Water Resources

-Groundwater Statement of Question: Provide copies of the following ER references:

b. The last five years of annual reports submitted to the Illinois State Water Survey reporting the pumping rates of high-capacity wells at the plant Response: The requested information is attached.List Attachments Provided: 1. The Illinois State Water Inventory Program, III State Water Survey, 2008.2. The Illinois State Water Inventory Program, III State Water Survey, 2009.3. The Illinois State Water Inventory Program, III State Water Survey, 2010.4. The Illinois State Water Inventory Program, III State Water Survey, 2011.5. The Illinois State Water Inventory Program, III State Water Survey, 2012.

U Il~lnoi ste Illinois Water Inventory Program 24Q i*Qzmp- 61820D.495

-Pbo. (217) 333-0239 -Fax (211) 244-077: February 2009

Dear Sir or Madam:

The Illinois State Water Survey is continuing:

its statewwe Illinois Water Inventory Program (IWIP) in order to determine the total amounts of water withdrawn from groundwater sources (wells) and surface water sources (intakes).

IWRP also collects data on the amount of water your facility buys from other entities.

Your prompt reply will make the 2008 inventory as complete and useful as possible.

If your facility did not return an inventory form for 2007, you will also receive a form for that year.Note. If you have already completed and sent In the enclosed form(s), please disregard this mesage recycle the paper,, and give yourself a pat on the back!We hope that the questions on the form aum self-explanatory, but feel free at any time to call data-entry staff at 217-33341239 or me at 217-333-9619 if you have any questions at all. The best times to call awe 8:45.. -4:45 Monday through Friday,. and you can also get in touch through e-mail (tbryantIiUnob.edu) or through a fax sent to 217-244-0777.

If your facility has 10 or fewer water source points (wells or intakes), we can provide a Microsoft Word template that you can modify to your operation and submit viaemail....You may notice a slightly differnt format for the water-me breakdmo portion of the form.Specifleally we have added span for discharge of coolng water-either directly to a stream or lost to evaporation (e.g, through cooling towers). If you can account for discharge and consumption of processing water too, that information would be appreciated.

If the contact name, address, direct phone number, or e-nail address have changed, simply write in the necessay changes. New wells or intakes should be noted too.Please complete your facility's form(s) as soon as you are able, and return them in the postage-paid, self-addressed envelope included with each form or set of forms.Thank you for helping the Illinois State Water Survey gain a better understanding of water use throughout Illinois.:.

Sincerely,....... .. E U U ' O s Tim Bryant Coordinator Phone: (217)333-9619 Faxm (217) 244-0777 E-mail: tbryantillnoiLed'u Illinois Water Inventory Program Illinois State Water Survey Z G lUbM

  • IL 6I 79 0 W M7) 4
  • PI mu,,tm ftm by 3M Survey (1895)14131145 EXELON- BYRON STATION DAVE STARKE, ENVIRONMENTAL CHEMIST Contct Peion and Tilde 4450 N. GERMAN CHURCH ROAD BYRON, IL 61010 Phone (815) 403207.,,mel davidtsrkacuxerp.eom We haw I "a S fdao g f bM weft intskdo for You faCy. PbeSe *owec inauuvdes mci aO d mning infoimatt oaUs faom EnWr war bwvl eibfanmtt on She tst page, If Nteon If repotad a f am not in gadmn, pe inlose ailts at msMumw 2008 -TOTAL GALLONS PUMPED -WELLSRMAKES Welor Intake Status Twn Rng Sec oep0" Maumnn Daly Pumpegs I I-Use 24N OE 244H 1500 ,

"-"--'-COOULG SCOfNDA RY MAKEUPISAN , I U. M 106 ISM 7C 7qq 000 ROCK PJV- --2 IA-Us 24N 1013 24.2H Ism0 EM.ERO~CIE-a COOLINCIASECONMD RY MAKEUPSAN Total Gallo n Withdrawn from ..Source. ..................................

H* m umiao of pkm pm*, on db how sigl day of deye w.0e Total Annual Giomna Wildrm 3~r ;;3W0 ,- -I,-. , ,,.-,,..* ..Pap I of 3 14131145 EXELON -BYRON STATION Plm nos Uii a uny armunt.d iOua n- ms to be repated In the colunm Toba CGalon Purchsue bow. Ths naundt is neemde to m he wtr us. tfor your lo amdon W y Mufe" ne N yow fly is not equoped vh maw to cak ts tMol wr m ump ag an igm or oatr heWpful mdon(such as staff popuato a vibubm aonmm floodest or *me use at puming rate) i amptb to us cWalct wat u d you dit.Totl Galon PurchaedW S. Coolig , CO."sn-1 ,, , Type Of COOin SYiteM Q OnMe*hough CS Reclrcuiton Q Othe (W"eW.~C ........ ....................................

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C ,- AM U M ... .........

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Totl Galons 115. 3 6 0-.-,_-2. , ---C. SolaW D. -plye'owy E HydosiobWlWa F. Odw.I2 &ps 0 of PCASD GALON& Avwwenunber f emploee patrons, c~dal 4. (pr Oesn 8M~nQ~Your ota anupa-vpw gm~-I -I --UnasQKM 0I&MQ[]r Other(Wpedfy):

AW ar Page2 of 3 14131145 EXELON -BYRON STATION Wag TMnuMM ruhilfteda, mWd Vfr Lwds lDa*igV's dywhswwhmWdj~ycwws hmdbwrun or '@tMlum -wok? (TmV~s MWCd*bidd aswhjnal -s hodc dft~mf ft)yes_ W. If yak uu 0 ltdhtwiudmnbuAmaw~uumd Vmtyet1i~dm*.ts) wlthinViftIiGmW~hb&

VWno. Tregmerts) i if Wpw^ 08- pmus V' ft tkmng Wowts I"~ h~Emwd"ttp me" b In pwmisqvmwkzhdi(pin)~aWdlbfto mhnlwm~Duftn Vs im yem, VAM comuwa pmrIcss mW~ftd o rpe No yes-If ys as. dob a 1V~baientl"~y If yek 66 to Ib i~te d WeruvW5I Yes 0.0-NO 0 0 TypedmdrIMPH AnVies uWIjpMM to-Meun. bw*ustor aqiyCq'sdt?.

No Yes VWiWsoVW~Do you CIncl ago VMWr No YesX if yesTom a* idpr tzua~w nen viami? -Nf yes: Tom a sun or cawr mifam wdr body?-Nf yme To.a upec vpbam?If yme&To other? ______-nun~.___Yaw NpOW peft# IL -OY 8S 313 Page3 of 3 Illinois State WAME Illinois Water Inventory Program r 2204 Griffith Drive Champaign, IL 61820-7495 Tel (217) 333-0239 Fax (217) 244-0777 Please return form by 471107 Contact Person and Title: 14131145 EXELON -BYRON STATION DAVE STARKE, ENVIRONMENTAL CHEMIST 4450 N. GERMAN CHURCH ROAD BYRON, IL 61010 Phone (815) 4063207 e-mail: david.starke@exeloncorp.com We have reords of the following wells and/or intakes for your facility.

Please correct inaccuracies and add missing Information on this fonm;Enter water level information on the last page, if available.

If reported amounts are not in gallons. please indicate units of measurement.

2009 -TOTAL GALLONS PUMPED -WELLSIINTAKES Well or Intake ....Status. Twn Rng: Sec Depth Total Annual Gallons. Withdrawn IIn-Use 24N IOE 24.41-1 1500 _____ -, ý7.EMERGENCY COOLING/SECONDA RY MAKEUP/.SAN 2 In-Use 24N 1% 24.211 1500 6 20.EMERGENCY COOLING/SECONDA RY MAKEUP/SAN In-Usc.: 24N IOE 15.51- ...... IA ROCK RIVER.Total Gallons Withdrawn from All Soadrces:

...........

.......P e cr i e an ad m g i y .........Page 1. of 3 14131145 EXELON -BYRON STATION Please note that any purchased amount needs to be reported in the column Total Gallons Purchased, below. This amount is needed to indicate the water use for your location and your future needs.If your facility is not equipped with meters to calculate total water pumpage, an estimated figure or other helpful information (such as staff population and visitors, acreage flooded, or time used at estimated pumping rate) is acceptable to help us calculate water usage at your facility.Total Gallons Purchased Total Gallons -WellstIntakes

1. 2009 Total Pumpage: 0 0 ' ýtI 'j-- 0 A. Processing/Washing: -t-., -B. Cooling& Condensing.

......goo Type of Cooling System: [ Once-through l Recirculation r-1 Other (specify):

Discharge:

.......................................................................................................................

Consumption:

....................................................................................................................

ýk 10. 0 04)069 -600 C. Boiler Feed: D. Employee/Sanitary:

E. Hydroelectric Flows: F. Other: ,ýj q Cqq Q_ 0!jdi Uel~ics-A1-V 8 56 Net Generation:

Gross Generation:

qd q 4 Units: E W kW r rMW1V GW Other (specify):

2. Supplier of PURCHASED GALLONS: 3. Average number of employees, patrons, etc. daily: 4. (Power Generation Stations)

Your total annual power generation during 2009: Page 2 of 3 14131145 EXELON -BYRON STATION Well Treatment, Rehabilitation, and Water Levels During the last year, have any of your wells had treatment or rehabilitation work? (Examples would include surging, jetting, acidizing, shock chlorination, etc.)Yes __ No -If yes, please list which well numbers and the type of treatment(s) within the following table.Well no. Treatment(s)

If known, please provide the following water level information:

Water Levels Well *Airline Water Nonpumping Pumping No. length level (ft) date Hours Gageý* Depth Hours Gage** Depth to Pumping off reading to water on reading water Rate (Mf) (if) (if) (gpm)Notes: *Same as punp setting If gage reading is in pounds per square inch (psi), add "psi" to the number.During the last year, were water conservation practices requested or imposed?No Yes If yes, due to a limited treatment capacity?If yes, due to limited water availability?

Other reason?Yes FL E]No[3 LI Type of restriction:

Date: Are there any plans to increase treatment or supply capacity?No .. _ Yes MtWhat are they?Do you discharge water? No Yes '<If yes: To a municipal wastewater treatment system?If yes: To a stream or other surface water body?If yes: To a septic system? iA If yes: To other ?System name Your NPDES permit# rLod'/g 3 !3 Page 3 of 3

, I Illinois Water Inventory Program i inGdffti r b CM --a L411X7495 Tdl(31) P3) 3244 I mtumfsnn Wbyd1 I Cantt Penmn md T11 14131145 EXELON -BYRON STATION DAVE STARKE, ENVIRONMENTAL CHEMIST 4450 N. GERMAN CHURCH ROAD BYRON, IL 61010 Phone (81i) 406M We hem reclsor h rol asI for yow faIy. Pbm owmd bipbmwnwW wi aduft an Oft Own Eriur w kdmnuh an ft Md NIt I "mi If epou mn M am i hi i anuuo In ae ke uk b ofuuuso u m ide 2010 -TOTAL GALLONS PUrME -WELLUSNTAKE Welor Intae 60" Twn Rng See DepM ToW Annual GoIanlloa Wfflhwn I blfU UN 1OE 24411 14 )f EMmERCOY mm mm i RY M--EUPM-N RY2 WUW UNW 108 24211 500 I Go -11 EMERGECY -----,~RY I 10E 11,1, .J ?*o 060 R=Ci R1VM Total Wons Wi~in broon AM Sourcs.....................

1 09 2 1 Pap I of 3 14131145 EXELON -BYRON STATION , Pldem nob that anpr=aemd mWOsa nedsf to b Mpoxtsd In the column ToWl GalMM P hMasd f elow. Ths amnountl neede to incatle s thewsr use for Wy locat:on and your future neeft Jlyour facay is not equipped uwit nmbrs to calculats total water punipag an eulhnaled 1gw. or a1w heWftlmwdlon(such as staff population and vishs acrempfl hoode, r me unsd at emated puminog mi Is am blo to helu calculate welta usg at yurfaclity.

Total Gallons Purcmhasm Total GOalao. W eebna 1. 2010 ToWa 0 , 2"7 74 1 7a J A. Pomo&. Coom g 9Cnenslngi 0 Type of COO"n System [] Ona~M.Uugh OgRerotatlon Odte (Wpec*/):Z,.ari -L - old W ..................................

?.................................

C. Boller Feed E. Ri*yoectuFlm F. OIwe 2. Supplie of PURCHASED GALLONS: 3. nuwthe atmployew pt h oft. da 4. (Powwr Oseral on Steone Your toM annual powr oeeration du&ng 2010:-.-.-.--, ---.-I ---.-I -I -._..L, JI,,.IZlk, a___-I -. .o-i I -* --I I I aur Netuenratlot,',I 57i, g Gr'e sGeneraila Units QM WIZIMV QV OW ther (speciy) _ __ _Page 2 of 3

i w 14131145 EXELON- BYRON STATION Wll Tmabment, Waftr Levels, Comervalam, and Dsclmrge.During the lt yeaw, have any of your welk had tresament or nhabilltdon work? (Examples would inchude s"ing, jetting, acid Wng, shock diloikaton, eft)Yes_ No, If yes, pleme list the wel numbers and the typeof reaments)

In the Ibowingoteb Wd No. TreatmentLs)

If your wells were pumpteted uding the caWlear ywr, please the kiblng water level infomaton.

Well Jrlie No. length lv iping Pumping dab Horif Gauge Hours on Gauge Depth to Pumping readng recing Water Rabe (11)" (V)W (own)inb-I~. 4 I 4 U*Smn as pump setng"f gauge radIng Is in pounds per square inch (psi), Indicte that In the column. If the gauge Is dire eadin9g, Mnoia During the Mest yew, were water cnservation practices requested or Imposed? Yes _No.X If Yes Because of limitltreatrmnt capacity?

Yes No__ Because of limited water availabiity?

Yes_ No -O"t, Tun& M Mfu t________________________________________________

IkWW, Are there plans to incmase Ireaetent or supply capacity?

Yes No__Plans: Does your Waly discharge wastmewtr?

Yes XNo_IfYe. Toamunic wa ewa ebO.eant 2bo Name of sy To a sbeam or other surface water body? __ Your NPDE To a septic sy -m J kl MIN-ownm: Spefr!dtt SIc66j483I3 Page 3 of 3 C C ILLINOIS STATE WATER SURVEY PRAIRIE RESEARCH INSTITUTE Illinois Water Im try Program UrLs* d at Lbna a',ap~p 22%4 Grft Oh. -Chmar n IL 8182D-7403 T 217-333-OM39

  • F 217-244-0777 i Pklsum mam by, ~ 51211 I 14131145 EXELON -BYRON STATION DAVE STARKE, ENVIRONMENTAL CHEMIST 4450 N. GERMAN CHURCH ROAD BYRON, IL 61010 PhimniI W% Ir.m ofi e ft lnb web OWN ms for yarwm bef. plum amid himumm OnWi OmNIm Ish bmesan "m tom Emnw wow bft Inlus n an fh IqM p mItlu .Itpmd p moui me ndt In pftn plm hdIkf wun of smoms W11 -TOTAL GALLONS PUMPED -WE.LS.TAKES Wel or 81us Tyr Rng Sea DMp Tot IAmnul Gdlls WIlhdwi I hs 10 2441 150 sI t RY MAKEUPAN I bhv 24N IE I.SH ROCK RI- ---ToW GOon" Wlhldrmn ftrm AM Sour= ....................................

is Vo I ML M 0 4DD 14131145 EXELON -BYRON STATION po l mo ptood ant oee- s t e fm betd pi Me tom TOW Gobm e. TM. wmoKb ned to hmt wo ew ue for to Ioot )d yow rneds Itymx bo na eympa i d aivM m to a aduiade WtWOWvinw , -an oum i slier h*IW -numu (eus a OW psMm wd vbb emue aflhod ord lnd ol bdhd pm"m I@" us emp le h* us Ucdmk wo usqe at yC*TOo G011w PwdIehed TolW Galms. MWeisn I. 2,011 TOW P-.I- .-!. M,- -i J IL Ca"h A CnWsuln -I -q 7 TymalcooslhguSm Q toowlrup Rt1u~e Q00w (pd__________

U ......................

................

o° ........ ........ ........ ...............................

C. F-d: D. A ilopl -Ma~y.U.. HydIwoeoeb' F. OMiIer.2. Sepllr of KMCKsuO GALLON: 3. ANmN@ w 0 of e o deml 4. (VPiw OQeneimad Sim) Youwr l ennuO mnmr 0ene0 m dewing 2011: 7.05 110 .*4LAU,4L,000

-~ ~ 1 coo. --a -a -.-a* -a -a -a. -a -a --a -a -a -R0 Nooeneagsft OHMci~1 a &~neum____

Wvf Q3 'w [Uw EJW Cli (ePem ____0 1 --.14131145 EXELON -YRON STATION PWe TImtInme Wlr Levels, Conmervatin, aid iscIeIgt Durfo the lost yew, have any of your wells had tioiment or mhilAon worIO (Exmp es would include suqi~n, jeoting, acidzing, shoc cthlorinaion, ft)Ye.__ No 4 Ifyso, plessbt Vie w numbe and the type of bfeents) in tef lowig tobie.Id WNo. Tisim s*G if youireb woe pummo4.d dudnofVi coin ridryw, phinepro~dds tth ibrIQ Mwal~irbgalI Nmd.Weil Ailine, Wae Levels No. Iw Water I"~ NonpumnpkV pumpbv Hamsoff ftge Hous o Gmpg Depth t Pwrnpkm 1m qj reading WSRo (Lr VW* (gpm)inI~E-p 6 I S 6 0 I I-u-p i ,

  • 0 I a _______ a a 4 4 *"sunem opumpetM"If gauge reading i hi pounds per square inch (ps, indicake thit In fie column. If the gouge is dirsc retiw indicIte fet (ft).Durfg the let yer, were waler mnsov'Won pradcus equul d or inmosd? Yes _ No f Yea Bs~muse of lkuitsd b eMbem capacity?

Yes No_ Becuse of lkitad water avaity? Yes No Type df reiulcUan________________

Datms:__________

Arethine plar~ns obcmeasebteatnent or suiply capacity?

YesNo .Plans: Does you facilty d wtswatmee?

Yes,.. NO._If YeI To a municialI w aft ler Ieament system?_Lf Name of a To a eIrum or oie saurfce water body? .XL$ Your NID To a me_.system?__

ODiWr)item: ESprm~t # IL 100 a ILLINOIS STATE WATER. SURVEY i PRAIRIE RESEARCH INSTITUTE Illinois Water Inventory Program, Z~Q4QD~~ -Chaspigs, IL 61820-495

-Pbion (217) 333-0239 -Fix (217) 244-0777 March 2013 Dear Engineers.

Superintendents and Plant Managers: Most of you will recognize the enclosed Water Inventory form from past years. Basically we ask for two thinp: (I) the amount of water withdrawn from your own wells or surface water intakes in calendar year 2012, and (2) the amounts of water used at your facility for various purposes (Processing.

Cooling and Condensin&

etc.) during the year. li l Pubic Act 096-0222 mow requires all owners of bigb-capacity web and ltalkes (thea. that are capable of pumping 70 gal.on per minute or more) to report their anmul water use to the Moaks State Water Survey.If you didn't complete and seud in a form for calndar year 2011, you'll receive two forms in the mail-one for 2012 and one for 2011. The 2011 forms will not include the last page.The Water Inventory website has recently been updat so you might check there first for answers to questdou:

hlp:/lwwwlsws.ia lbedu/igwuWp.

However, feel free to call data-entry staff at 217-33342M or me at 217-333-9619.

if you have any questiom at all. The best times to call are 8:30 -4:30 Monday through Friday, and you cmn also get in touch through e-mail (tbryaulmlid or llvmu ~i~nolsgedu) or through a fax sent to 217-244-0777.:

P Please note: Water Iuventory form, for specifle heliies cualot be downloeaded from the webite..However, we can provide a tillable PDF of your facility form upon if you request it in an e-mail. Be sure to put the name of your facility in the subject line of your requesL If you have Microsoft Word, you: can also use the Industrial-Commercial template on the Water Inventory website to enter well and/or intake locations, depths, and withdrawal&

THE TEMPLATE CAN ONLY BE USED IF YOU HAVE 10 OR FEWER ACTIrVE WATER SOURCE POINTS (wells or intakes).

The resulting document can be submitted via e-mail.If your main contact information (name, address, phone number, or e-muail address) has changed, please ma.k the necessary changes. Also write down any *new* wells or intakes you started using in 2012..Complete your facility's form(s) as soon as you are able, and return them in the postagelpid, self-address envelope included with each form or set of forms-or through scanning the original form and sending it by e-mail. If you send a legible fax or scan, or if you e-mail us a PDF or a Word file, there is no need to follow with a separate hard copy.: Thank you for helping the Illinois State Water Survey ain a better understanding of water use throughout Illinois.Sincerely, Tim Bryant Coordinator, Illinois Water Inventory Program 3:-Phone: (217) 333-919 Fax: (217)244-0777 E-mail: tbryouttilinols.edu ILLINOIS STATE Illinois Water Inventory Program WATER SURVEY 22o4 t81,M DM o e. L 618213-7403 PRAIRIE RESEARCH INSTITUTE T 217-333-=

  • F 217-244-0777 I. Pleame rebornfutm by 4R2M1"Conmo IPmon and Th1.14131145 EXELON- BYRON STATION DAVE STARKIE, ENVIRONMENTAL CHEMIST 4450 N. GERMAN CHURCH ROAD BYRON. IL 61010 Phone (515) 4063207@431St davkLa ark ezeloecrpmc We hme scdof ft ftm e ng web ui-r antrim fiyourd ftly. Pbmsn snd hauram a mksunmnn haomaan on Uv earm Enter IWM bifmmlon on Owe M U Navallalf, N unpsd amtsmb wend nd in 1mm pame WnU: unito of mefmxu.2012 -TOTAL GALLONS PUMPED -WE.LSLTAKES Wdlor Itake. SWus Twn Rng Sec Depth Tod Annual Gallons Withdawn I h-Ugs 24N 1013 244H 3500 4s 2 ~ 1 EMEROQICY-

RY MAKEUP/SMu 2 h-Un 24N 10E ."500 RY MAKEUPISAN I hU4. IAN IOE IS.1H ROaCWE R10 j Tota"-l --" a- A- --Totl alos ithran fomAR oum~ -'. ..Pae I of 3 14131145 EXELON- -BYRON STATION p~mea ei Uini poso ain=* uas&I be No mpd M In on Tow amm Ptwodimi In ,1 uWiu a hi fie "o hik ow glow iU how Oml!IW yow uin Iyow bdiyhik aod .qpuMm sfubs n u itow wMhr pump, n d am or wgo Iiwi 1m di iw0da"bo M. anl o or aw IpmII I hi ksuplihto.

hi mu igs cuw uw U w fav.TdW Odaus Pwo m TotW Gomnm- WIMimuis.1. 2012 TOW PWIipigt A l o=- a -I2d at I7 .1 III530 Co rope of COO*oi n yi 0 Qw~o 13. *aOm Q 09m(pd)~__________

a ........................

...... ....................

...... ..........

..........

.....................

.. .........D. b*o 0,11 E. Hy*oe" tm~o F. 0UmWr 2. Sngphi of PURCHAME 05LMOk&. Awsmii*tf SiSu~ 1OSi d 4 fCaarm maiYwb au pnudin'ubqut n a,11 2 I .9- 7O1-_. -s a." a. a. a. a a. a. a, a a. a. a* a-* ag a.l0 uri 13 wvm M"4g30w am" Geie~m0tsvw pr Pop 2 of 3

    • i ~ urn 1413114S EXELON -BYRON STATION Wo WAtr Lres Como*ailm, and Dihqp..o ug the lest yamr, have any of your wel hd treabnent or mehabi Won wrk? ( nples ouldinclucde Yesng._ jW acidN. ng, shodc ch bkndtion, eitc)Yes__ No K if yes, please iletfthewol utos and fte type of reatmets QIn theftbiloingligfe.

WON No. I Tim J J t your well wer pump-teded duwng the cmaln year, please proAde the Iftwing wte level ifnomaon.WA Airltne Water Levels, No. leng th-Hours off Gave Hours on Gauge Depth to Pumping n reainng Wat Rab*Suie as puny seS~g**If gouge reading Is in pounds per square inch (psi), InickAse tha in the column. If the gauge Is drect read Sg indicate (Itat 1(1-(t).fad 0:.During the Mest yaw. were water winservaton pradm~ requested or IV Ised? Yes NoK Nyfs Yg8isee"of kMted beftent capacly? Yes No_ Because of lknitmd water avellabilty?

Yes No-ONW.Typho Typeof esbctin: ......______.__"__"__"__Dats*_____________

Are thee plans to increase rearm or sup*py c.

  • y? YeaNo_Plans: Does yor fclity dbdwge wastamtec?

Yes ;.,No__ff Yeo To a municipal wadewe in Nemoofs Toaslu or other surface water body? , n nYour NPD OTo a septic SYStem?Other yetem: Eperafdt (we~5I WlinoiS Water Inventory Program 04fQI"g -CImp, L 61820-7495

-Phu (217) 333-0239 -Fax (217) 2444777 Facility Number: 14131145 Facility Name. Exelon.- Brn Statioc Addrs: 4450 N Geanma hurch Rd Cointact NPa. Zoo Cog Phg ow 15.4064M Faz815406-336 Stat: IL 7Jp 61010 Please list wells, mwrfa wm ntakes, ad locadonl infonation cc die lines below.* Eoer your water level (pump M) infixamum on the ho pr, if available, If ae not in paon, pleme indlicae units of memnment.Water WitMdrawals for Year 2J12 TOTAL GALLONS PUMPED FROM WELLS AND INTAKES Wear Sta.us To:m. Range" Sect.o Depth. Annual 1;0____ _____ ____ and Plot _ ____GalloS

-lI wgmcy 24N 1OE 24.4H 1500 22,505,722 Coonli I SmauT-A ..Sanitary -OA in-Urn 24N 10E 24.2H 1500 173,260 Cooling/-0B Sanitay -OH: Well _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _1 Rock River I-Un. 24N 1OE 15.5H 19,530,000,000

  • ID-U-e. .In-Use In-Us, ..InUs-U ID-U-TToal Gallons Wlhdrann fm Webs and Inh s .......................................

19 62R...

Pap 1 of 3 Water Use Bread~own and Disposal Please note that any purchased amount needs to be reported in the column Total Gallons Purchased, below. This mount is needed to Indcaot the water use for your location and you futre needs.If your faclity Is not equlpped with meters to calulste total water pumpage, an estimated figure other helpful infoation (sumc as tdff population and vitors, acreae flooded, or time used at estmated pumping rats) Is accepble to help us calculate watmr usae at your facility.1. Tot Pump,,e, 2012 Td Gallos Purchased:

TOW Gael, Welntslme 19,552,878,982 A. ,,omb---iWahs:

226789e2 B. Cooling & Co dusbi 19,s30ooo,00 oo Type of Cooling System: Once-through:

F leclkcINg Other (spef: Dlscharge:.

6,855,123,765.6 Conumption.:

12,674,876,235 C. BMou eed 5000 D. EmploWeS taryW. 2187270 E. Hydroelectric Flow F. Other (IQ.igaton, Ash Sluice, Blowdown, etc.): 2. Supplier of Purchased Gallons: 3. Avwage number of employees, patrons, etc. dall.. 830 4. Total annual power generation during 2012 Net Gross: Units of measument kW-h: [ MW-h: [3 GW-h: 3 Other (specify):

Page 2o3 Uk Well T1amt, Waler Levsl, Conmmao, mand Dsm rge A~f In lest yew, have any of your webl had treafinert or rehablitation work? (Ezwiiplss would Include qjatfilog.

acdd"g. ml mok chlornadon, eft.)Yes C3 No .I yes plgm I which well and the type of teaMont(s)

In tse foomwg tam.WeI No. Tremient(e) f your web were tested Us osndr yew. pleas prwide r tew ,l Well No. AM*ne Tet. Nparping (Slab) Leavl P... .0 (Dynamr ) Level Le~h Oat ___ __ __Hours Gauge Depth to Hours Gauge Depth to Pumpin on Redning Water On Readf- Water Rate___ ___ ~~fed)- !L L'fNpugs reeingis in mrift per smse hi (pm) hi mat in h %r ff qs isbi I Ut g aug ca diret ' Osng i mpotetst(I.

  • Aig m las"t ywe waft camervaiopreasn liquested or Iposed Yes 13 No i..if yes: Because d Imlu treatme capacty 03 Because of billed wafte avalabllty 03 Type of restrlctior Dales: Success or eetated amat of sam ig Ame there plane to incease treamen or supply capac fty No Yes 03 Plars Doyoudlschargwetsr?

Yes 0 NoOl IfYes: Toa ci "a s m 03 Name of syftem: To a stream or odhe surface water body R Your NPDES permit IL10048313.

.To aseptc system 03 Other Pagesof3 Byron Environmental Audit -Request for Additional Information Response Question #: WR-GW-2 Category:

Water Resources

-Groundwater Statement of Question: Provide groundwater water quality monitoring data (including radiological constituents) for the period from the last submittal to the NRC up to the present.Response: By letter dated May 13, 2013, Byron Station submitted its "Annual Radiological Environmental Operating Report" (AREOR) for year 2012 to NRC. The 2012 Radiological Groundwater Monitoring Program data were contained in Appendix G to that report. The AREOR for year 2013 will be submitted to NRC in May 2014. Currently, draft data from the first three quarters of 2013 are available, but have not been submitted to the NRC. Reports containing these draft data are attached to this response.

No data from the 2013 fourth quarter are yet available.

List Attachments Provided: 1. Letter from AMO Environmental Decisions (R. Golia) to Byron Generating Station regarding March 2013 RGPP Summary Monitoring Report (1st Quarter 2013)[DRAFT]. May 2, 2013.2. Letter from AMO Environmental Decisions (R. Golia) to Byron Generating Station regarding May 2013 RGPP Summary Monitoring Report (2 nd Quarter 2013) [DRAFT].July 17, 2013.3. Letter from AMO Environmental Decisions (R. Golia) to Byron Generating Station regarding August 2013 RGPP Summary Monitoring Report (3 rd Quarter 2013)[DRAFT]. September 10, 2013.

DRAFT AMO Environmental Decisions PO Box 410 4327 Point Pleasant Pike Danboro, PA 18916 215-230-8282 (Phone)215-230-8283 (Fax)www.amoed.com Environmental Decisions Geologists Hydrogeologists GIS Analysts Environmental Scientists Earth & Environmental Resource Management Consultants 7, May 2, 2013 Byron Generating Station Chemistry Manager/RGPP Coordinator 4450 North German Church Road Byron, Illinois

Subject:

March 2013 RGPP Summary Monitoring Report (1 st Quarter 2013)AMO has interpreted the analytical data and field data for the March 2013 Radiological Groundwater Protection Program (RGPP) sampling round, which was completed by EIML (a third party vendor under contract with Exelon Corporation) between March 18, 2013 and Mach 20, 2013. Exelon's RGPP (EN-AA-408-4000 and EN-BY-408-4160) incorporates guidance as detailed in NEI 07-07, ANI 07-01, and EPRI 1015118. All laboratory and field data from this sampling round has been uploaded to the Exelon RGPP Database maintained by Locus Technologies.

The attached tables, graphs, and figures summarize the findings of the Mach 2013 sampling round. Overall, tritium concentrations have been decreasing at the Station since the 2006. Based on our review of the March 2013 sampling round and available historic data, there does not appear to be ongoing tritium leak at the site.The Station conformed with it's RGPP during the 1 st quarter 2013 with respect to sampling protocol.Please call me at 215-230-8282 if you have questions.

Respectfully, AMO Environmental Decisions Ralph T. Golia, P.G.Principal Hydrogeologist attachments File AMO Environmental Decisions 1 Byron 201303 (March) RGPP Report Cover Letter DRAFT Byron Generating Station Exelon Corporation Table I Radiological Groundwater Protection Plan Evaluation Checklist Station: Monitoring Round: Byron Generating Station Completed March 18 through March 20, 2013 Compliance Evaluation Evaluation Checklist Yes or No Explanation P.1.1 -Was depth to water collected at all monitoring locations?

YES 1 2- Were all required field data measurements collected?

YES 1 3- Were all required sampling points sampled? YES See the attached Figures la and lb for sample 1 locations.

4- Were all required analyses performed?

YES 1 5- Should there be changes to sampling frequency based on NO NA analytical data?6 -Should there be a well designation change based on analytical NO NA data?Total P.1. Score for the Quarter 4 Data Evaluation Data Evaluation Yes or No Explanation 1 -Are there tritium concentrations

>2,000 pCi/L, but <20,000 NO pCi/L?2 -Are there tritium concentrations

>20,000 pCi/L, but <100,000 NO pCi/L?3 -Are there tritium concentrations

>100,000 pCi/L? NO 4 -Are there increasing tritium concentration trends? NO 5 -Are there decreasing tritium concentration trends? YES The attached graphs for AR-4 and AR-1 1 show an overall decreasing tritium concentration trend since 2006.6 -Are non-tritium analytes detected greater than MDL? NA 7 -Are there increasing non-tritium concentration trends? NA 8 -Are there decreasing non-tritium concentration trends? NA 9 -Are there increasing groundwater elevation trends? NO 10 -Are there decreasing groundwater elevation trends? NO 11 -Are the significant changes to groundwater flow directions?

NO Notes: 1. P.I. -RGPP Performance Indicator.

A score of 0 indicates that the RGPP guidance was not followed.

A score of 1 indicates the RGPP guidance was followed.AMO Environmental Decisions Last updated: 4/30/2013 Byron 201203 (March) Conformance Table Byron Generating Station Exelon Corporation W RA -4th Quarter 2012 and 1st Quarter 2013 Groundwater Tritium Concentrations and Change in Tritium Concentrations Change in Change in Sample ID Sample Round Result (pC/L) Qual Sample Round Result (pC/L) Qual Concentration Concentration Aquifer (pC/L) (%)AR-4 4th Qtr. 2012 830 + 1st Qtr. 2013 818 + 3 Upper Galena-Platteville AR-1 4th Qtr. 2012 173 U 1st Qtr. 2013 191 U 0 0 Upper Galena-Platteville AR-10 4th Qtr. 2012 172 U 1st Qtr. 2013 187 U 0 0 Upper Galena-Platteville AR-3 4th Qtr. 2012 158 U 1st Qtr. 2013 190 U 0 0 Upper Galena-Platteville AR-8 4th Qtr. 2012 174 U 1st Qtr. 2013 189 U 0 0 Upper Galena-Platteville AR-9 4th Qtr. 2012 171 U 1st Qtr. 2013 192 U 0 0 Upper Galena-Platteville CAR-3 4th Qtr. 2012 175 U 1st Qtr. 2013 188 U 0 0 Upper Galena-Platteville DF-24 4th Qtr. 2012 158 U 1st Qtr. 2013 187 U 0 0 Upper Galena-Platteville AR-7 4th Qtr. 2012 191 + 1 st Qtr. 2013 245 + 45 21 Upper Galena-Platteville AR-11 4th Qtr. 2012 994 + 1st Qtr. 2013 850 + -144 -16 Lower Galena-Platteville Explanation:

pC/l -Pico-curies per liter.U -Analyte not detected at a concentration exceeding the laboratory minimum detectable concentration.

+ -Analyte detected at a concentration exceeding the laboratory minimum detectable concentration.

Notes: 1 ) Change in concentration (pC/I) represents the difference in concentrations between the 4th quarter 2012 and the 1st quarter 2013 monitoring rounds unless otherwise noted. Positive numbers represent an increase in concentration; negative numbers represent a decrease in concentration.

2) All detections and detection limits less than 200 pico-curies per liter are considered equal to 200 pico-curies per liter for the purposes of this report.3) Change in concentration

(%) is equal to the change in concentration between the two sampling rounds divided by the average of the analytical results for the two sampling rounds.4) Data reported in the tables and figures does not include the results of re-analyses completed by the laboratory.

Only the highest analyte concentration per sample location is presented.

AMO Environmental Decisions Byron Change Tables (1Q 2013)Page I of 1 Byron Generating Station Exelon Corporation D P AT4ITeT- 1st Quarter 2012 and 1st Quarter 2013 Groundwater Elevations and Groundwater Elevation Changes Monitoring 1st Quarter 2012 1st Quarter 2013 Change in Well ID Groundwater Groundwater Groundwater Aquifer Elevation Elevation Elevation (ft)TW-13 683.20 683.19 -0.01 Shallow Overburden CAR-1 672.48 674.55 2.07 Upper Unconsolidated AR-7' 781.82 775.88 -5.94 Upper Galena-Platteville AR-8 839.10 835.11 -3.99 Upper Galena-Platteville MW-1 806.45 803.34 -3.11 Upper Galena-Platteville AR-10 838.61 835.76 -2.85 Upper Galena-Platteville AR-4 743.47 740.94 -2.53 Upper Galena-Platteville MW-3 788.48 786.48 -2.00 Upper Galena-Platteville AR-3 803.41 802.38 -1.03 Upper Galena-Platteville AR-2 809.18 808.18 -1.00 Upper Galena-Platteville AR-1 830.95 831.09 0.14 Upper Galena-Platteville DF-24 724.71 725.17 0.46 Upper Galena-Platteville AR-97 828.75 837.15 8.40 Upper Galena-Platteville WELL-7i 793.58 809.81 16.23 Upper Galena-Platteville833.94 850.75 16.81 Upper Galena-Platteville AR-11 744.88 742.34 -2.54 Lower Galena-Platteville Explanation:

1 -Groundwater fluctuations in AR-7 have ranged between 765.96 feet amsl (April 2006) and 793.61 feet amsl (April 2009).2 -Groundwater fluctuations in AR-9 have ranged between 819.21 feet amsl (April 2006) and 851.76 feet amsl (October 2006).3 -Groundwater fluctuations in WELL-7 have ranged between 775.47 feet amsl (April 2006) and 810.34 feet amsl (March 2011).4 -The groundwater elevation reported for CAR-3 during the 1st quarter 2013 sampling round was the highest reported groundwater elevation since reporting begain in spring 2006.Prior to the 1st quarter 2013 the groundwater elevation fluctuated between 819.21 feet amsl (April 2006) and 845.69 feet amsl (October 2009).Notes: 1) All groundwater elevations presented in feet above mean sea level.2) Change in groundwater elevation represents the difference in groundwater elevations between the 1st quarter 2012 and 1st quarter 2013 sampling rounds.Byron Change Tables (10 2013)Page 1 of 1 AMO Environmental Decisions DRAFT AR-4 Tritium Result vs. Groundwater Elevation-+-Tritium Result --*Groundwater Elevation 10,000 758 756 754 E 752r 02 0 750 co E>c 1,000 , 0 .. .. ........ .- -VIM748 -U (U 746 744 CD 742 100i 740 CO0( CO CO N- N- C-4 04 MOC )))) 0 0'-' -'00 0 0 0 0 0 000000 00 -'- -C- '- '- C- -'r.- "T- -V'-CD CD 0 0 0 0 C0 C a CD a 0 0 0) 0 aD 0 a 0 0 C) 0 0 a a C)(N Q~. N% NN N QN N QN N QN N N N N NN NN Q N N N N N I~t r.- 0 P- -0 'WT tz CD0 4-r- 0' lq r CD I,0- C) C)0'Date DR AFT AR-7 Tritium Result vs. Groundwater Elevation Trend Tritium Result ---Groundwater Elevation 10,000..I a.0 E..m.1,000 0 U E I--800.00 795.00 790.00 *'E 785.00 0 cc 780.00 .)L 775.00 0 770.00 $765.00 760.00 100+Date DRAFT AR-Il Tritium Result vs. Groundwater Elevation-$Tritium Result --a- Groundwater Elevation 10,000 755.00-750.00 745.00 740.00 E 0 -735.00 0 C1,000 730.00 >UL o 0 o 725.00 'm E-720.00 o 0 I'- a-715.00 710.00 100 r.. ... .. ... .. 705.00.O C..O .O Nr,, -, -C, C O C O CO Co C, 0 0 0 0 0 0 -N N , C'0 0a0 0 0 0 0 0 0 a 0 00 00 C ) -'- '- --- 'V- T- '- '-C CD 0'- C N 0C -o -C 0 0 0N 0 -C N 0 0 -C N- 0 -C N- 0 -C V0 V, '- T- ,-Date 0 0 0 AR-3 0 0 5 -9 0 1,000 2,000 Feet Explanation:

1st Qtr. 2013 Upper Galena-Platteville Formation Tritium Sample Locations* Result 200 to 2,000 pCiIL* Result <= 200 pCiIL Figure la 1st Qtr. 2013 RGPF Tritium Sample Locations Upper Galena-Platteville Formation Exelon Corporation Byron Generating Station a a 0 9 N J.0 0 1,000 2,000 Feet Explanation:

1st Qtr. 2013 Lower Galena-Platteville Formation Tritium Sample Location* Result 200 to 2,000 pCiIL Figure 1t 1st Qtr. 2013 RGPF Tritium Sample Location, Lower Galena-Platteville Formatior Exelon Corporatior Byron Generating Statior Ns 8 0 a a)0 1,000 2,000 , Feet Explanation:

1st Qtr. 2013 Upper Galena-Platteville Formation Tritium Concentration Change E Increase in Tritium Concentration

  • Decrease in Tritium Concentration 818 -Tritium result presented in pico-curies per liter (pCiIL)-22 -Difference in tritium concentration.

between the 4th quarter 2012 and 1st quarter 2013 RGPP Sample Rounds.-Only sample locations with reported tritium concentration greater than 200 pCi/L during the 4th quarter 2012 or 1st quarter 2013 RGPP sample rounds are depicted.Figure 2a 1st Qtr. 2013 RGPP Tritium Concentration Change Upper Galena-Platteville Formation Exelon Corporation Byron Generating Station a N S 0 a 0 C--.-0 0 1,000 2,000 Feet Explanation:

1st Qtr. 2013 Lower Galena-Platteville Formation Tritium Concentration Change 0 Decrease in Tritium Concentration 850 -Tritium result presented in pico-curies per liter (pCiIL)-144 -Difference in tritium concentration between the 4th quarter 2012 and 1st quarter 2013 RGPP Sample Rounds.-Only sample locations with reported tritium concentration greater than 200 pCi/L durng the 4th quarter 2012 or 1st quarter 2013 RGPP sample rounds are depicted.Figure 2b 1st Qtr. 2013 RGPP Tritium Concentration Change Lower Galena-Platteville Formation Exelon Corporation Byron Generating Station Byron Generating Station Exelon Corporation Appendix A.E)] x F T Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer TW-13 4/27/2006 157 U Shallow Overburden TW-13 4/27/2006 201 + Shallow Overburden TW-13 11/1/2006 186 U Shallow Overburden TW-13 4/20/2007 152 U Shallow Overburden TW-13 10/8/2007 171 U Shallow Overburden TW-13 5/28/2008 188 U Shallow Overburden TW-13 10/2/2008 164 U Shallow Overburden TW-13 4/29/2009 152 U Shallow Overburden TW-13 10/14/2009 151 U Shallow Overburden TW-13 5/19/2010 153 U Shallow Overburden TW-13 10/21/2010 161 U Shallow Overburden TW-13 5/9/2011 185 U Shallow Overburden TW-13 11/2/2011 181 U Shallow Overburden TW-13 5116/2012 164 U Shallow Overburden TW-13 10/17/2012 159 U Shallow Overburden TW-14 4/27/2006 153 U Shallow Overburden TW-14 11/1/2006 189 U Shallow Overburden TW-14 4/20/2007 154 U Shallow Overburden TW-14 10/8/2007 176 U Shallow Overburden TW-14 5/28/2008 186 U Shallow Overburden TW-14 10/2/2008 168 U Shallow Overburden TW-14 4/29/2009 Not Sampled U Shallow Overburden TW-15 4/27/2006 159 U Shallow Overburden TW-15 1111/2006 185 U Shallow Overburden TW-15 4/20/2007 156 U Shallow Overburden TW-15 10/8/2007 176 U Shallow Overburden TW-15 5/28/2008 186 U Shallow Overburden TW-15 10/2/2008 164 U Shallow Overburden TW-15 4/29/2009 Not Sampled U Shallow Overburden CAR-1 4/27/2006 154 U Upper Unconsolidated CAR-1 11/1/2006 190 U Upper Unconsolidated CAR-i 4/20/2007 155 U Upper Unconsolidated CAR-1 10/8/2007 174 U Upper Unconsolidated CAR-1 5/28/2008 187 U Upper Unconsolidated CAR-1 10/1/2008 166 U Upper Unconsolidated CAR-1 4/29/2009 152 U Upper Unconsolidated CAR-A 10/14/2009 149 U Upper Unconsolidated CAR-1 5/17/2010 Not Sampled U Upper Unconsolidated CAR-1 10/20/2010 157 U Upper Unconsolidated CAR-i 5/9/2011 191 U Upper Unconsolidated CAR-I 11/2/2011 184 U Upper Unconsolidated CAR-1 5/16/2012 168 U Upper Unconsolidated CAR-1 10/17/2012 159 U Upper Unconsolidated AR-1 4/26/2006 165 U Upper Galena-Platteville AR-i 11/1/2006 185 U Upper Galena-Platteville AR-1 4/20/2007 153 U Upper Galena-Platteville AR-1 10/8/2007 180 U Upper Galena-Platteville AR-1 6/2/2008 187 U Upper Galena-Platteville AR-i 9/30/2008 163 U Upper Galena-Platteville AR-1 4/27/2009 157 U Upper Galena-Platteville AR-1 10/15/2009 165 U Upper Galena-Platteville AR-1 5/17/2010 154 U Upper Galena-Platteville AR-1 10/22/2010 159 U Upper Galena-Platteville AR-1 3/7/2011 139 U Upper Galena-Platteville AR-1 5/3/2011 184 U Upper Galena-Platteville AR-1 7/19/2011 172 U Upper Galena-Platteville AR-i 11/2/2011 181 U Upper Galena-Platteville AR-i 3/6/2012 174 U Upper Galena-Platteville AR-1 5/14/2012 175 U Upper Galena-Platteville AR-1 8/20/2012 170 U Upper Galena-Platteville AR-1 10/16/2012 173 U Upper Galena-Platteville Byron Change Tables (IQ 2013)Page 1 of 6 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A PR, T Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-1 3/18/2013 191 U Upper Galena-Platteville AR-10 4/26/2006 185 U Upper Galena-Platteville AR-10 11/1/2006 188 U Upper Galena-Platteville AR-10 4/15/2007 156 U Upper Galena-Platteville AR-10 10/8/2007 178 + Upper Galena-Platteville AR-10 6/2/2008 189 U Upper Galena-Platteville AR-10 9/30/2008 160 U Upper Galena-Platteville AR-10 4/27/2009 155 U Upper Galena-Platteville AR-10 10/15/2009 194 U Upper Galena-Platteville AR-10 5/17/2010 157 U Upper Galena-Platteville AR-10 10/22/2010 160 U Upper Galena-Platteville AR-10 3/7/2011 174 U Upper Galena-Platteville AR-10 5/3/2011 184 U Upper Galena-Platteville AR-10 7/19/2011 171 U Upper Galena-Platteville AR-10 11/2/2011 189 U Upper Galena-Platteville AR-10 3/6/2012 173 U Upper Galena-Platteville AR-10 5/14/2012 174 U Upper Galena-Platteville AR-10 8/20/2012 173 U Upper Galena-Platteville AR-10 10/16/2012 172 U Upper Galena-Platteville AR-10 3/18/2013 187 U Upper Galena-Platteville AR-2 4/26/2006 432 + Upper Galena-Platteville AR-2 4/26/2006 527 + Upper Galena-Platteville AR-2 11/1/2006 492 + Upper Galena-Platteville AR-2 11/1/2006 413 + Upper Galena-Platteville AR-2 4/18/2007 548 + Upper Galena-Platteville AR-2 10/8/2007 383 + Upper Galena-Platteville AR-2 5/29/2008 186 U Upper Galena-Platteville AR-2 10/1/2008 169 U Upper Galena-Platteville AR-2 4/29/2009 152 U Upper Galena-Plattevilie AR-2 10/15/2009 152 U Upper Galena-Platteville AR-2 5/19/2010 160 U Upper Galena-Platteville AR-2 10/20/2010 163 U Upper Galena-Platteville AR-2 5/9/2011 183 U Upper Galena-Platteville AR-2 11/2/2011 183 U Upper Galena-Platteville AR-2 5/16/2012 169 U Upper Galena-Platteville AR-2 10/17/2012 157 U Upper Galena-Platteville AR-3 3/24/2006 214 + Upper Galena-Platteville AR-3 3/24/2006 160 Upper Galena-Platteville AR-3 3/24/2006 271 + Upper Galena-Platteville AR-3 3/24/2006 198 Upper Galena-Platteville AR-3 3/24/2006 207 + Upper Galena-Platteville AR-3 3/27/2006 459 + Upper Galena-Platteville AR-3 3/27/2006 346 + Upper Galena-Platteville AR-3 3/29/2006 372 + Upper Galena-Platteville AR-3 4/3/2006 489 + Upper Galena-Platteville AR-3 4/10/2006 351 + Upper Galena-Platteville AR-3 4/26/2006 389 + Upper Galena-Platteville AR-3 4/26/2006 234 + Upper Galena-Platteville AR-3 6/22/2006 224 + Upper Galena-Platteville AR-3 7/20/2006 225 + Upper Galena-Platteville AR-3 11/1/2006 253 + Upper Galena-Platteville AR-3 11/1/2006 190 U Upper Gatena-Platteville AR-3 4/18/2007 327 + Upper Galena-Platteville AR-3 10/8/2007 965 + Upper Galena-Platteville AR-3 10/8/2007 1,110 + Upper Galena-Platteville AR-3 11/27/2007 1,180 + Upper Galena-Platteville AR-3 1/8/2008 757 + Upper Galena-Platteville AR-3 5/29/2008 186 U Upper Galena-Platteville AR-3 10/1/2008 163 U Upper Galena-Platteville AR-3 4/29/2009 155 U Upper Galena-Platteville AR-3 10/14/2009 149 U Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (IQ 2013)Page 2 of 6 Byron Generating Station Exelon Corporation Appendix A D NA T Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-3 5/19/2010 156 U Upper Galena-Platteville AR-3 10/20/2010 162 U Upper Galena-Platteville AR-3 3/7/2011 149 U Upper Galena-Platteville AR-3 5/9/2011 188 U Upper Galena-Platteville AR-3 7/20/2011 170 U Upper Galena-Platteville AR-3 11/2/2011 181 U Upper Galena-Platteville AR-3 3/7/2012 169 U Upper Galena-Platteville AR-3 5/16/2012 172 U Upper Galena-Platteville AR-3 8/15/2012 193 U Upper Galena-Platteville AR-3 10/17/2012 158 U Upper Galena-Platteville AR-3 3/20/2013 190 U Upper Galena-Platteville AR-4 4/27/2006 3,260 + Upper Galena-Platteville AR-4 4/27/2006 4,080 + Upper Galena-Platteville AR-4 11/21/2006 2,980 + Upper Galena-Platteville AR-4 11/21/2006 2,440 + Upper Galena-Platteville AR-4 11/21/2006 2,610 + Upper Galena-Platteville AR-4 11/21/2006 2,880 + Upper Galena-Platteville AR-4 5/1/2007 3,050 + Upper Galena-Platteville AR-4 10/10/2007 2,890 + Upper Galena-Platteville AR-4 5/28/2008 2,150 + Upper Galena-Platteville AR-4 10/1/2008 1,910 + Upper Galena-Platteville AR-4 4/29/2009 1,350 + Upper Galena-Platteville AR-4 10/15/2009 1,360 + Upper Galena-Platteville AR-4 5/19/2010 1,250 + Upper Galena-Platteville AR-4 10/21/2010 1,170 + Upper Galena-Platteville AR-4 3/7/2011 875 + Upper Galena-Platteville AR-4 5/9/2011 818 + Upper Galena-Platteville AR-4 7/20/2011 777 + Upper Galena-Platteville AR-4 11/2/2011 912 + Upper Galena-Platteville AR-4 3/712012 861 + Upper Galena-Platteville AR-4 5/16/2012 802 + Upper Galena-Platteville AR-4 8/15/2012 872 + Upper Galena-Platteville AR-4 10/17/2012 830 + Upper Galena-Platteville AR-4 3/20/2013 818 + Upper Galena-Platteville AR-5 4/27/2006 151 U Upper Galena-Platteville AR-5 11/21/2006 188 U Upper Galena-Platteville AR-5 4/21/2007 170 U Upper Galena-Platteville AR-5 10/10/2007 178 U Upper Galena-Platteville AR-5 5/28/2008 184 U Upper Galena-Platteville AR-5 10/1/2008 166 U Upper Galena-Platteville AR-5 4/29/2009 NA U Upper Galena-Platteville AR-6 4/27/2006 153 U Upper Galena-Platteville AR-6 11/21/2006 190 U Upper Galena-Platteville AR-6 4/21/2007 169 U Upper Galena-Platteville AR-6 10/10/2007 179 U Upper Galena-Platteville AR-6 5/28/2008 188 U Upper Galena-Platteville AR-6 10/1/2008 171 U Upper Galena-Platteville AR-6 4/29/2009 NA U Upper Galena-Platteville AR-7 4/27/2006 160 U Upper Galena-Platteville AR-7 10/30/2006 187 U Upper Galena-Platteville AR-7 4/15/2007 151 U Upper Galena-Platteville AR-7 10/8/2007 179 U Upper Galena-Platteville AR-7 6/2/2008 228 + Upper Galena-Platteville AR-7 9/30/2008 161 U Upper Galena-Platteville AR-7 4/27/2009 157 U Upper Galena-Platteville AR-7 10/13/2009 170 U Upper Galena-Platteville AR-7 5/17/2010 179 + Upper Galena-Platteville AR-7 10/21/2010 171 U Upper Galena-Platteville AR-7 3/7/2011 166 U Upper Galena-Platteville AR-7 5/3/2011 199 + Upper Galena-Platteville AR-7 7/19/2011 291 + Upper Galena-Platteville Byron Change Tables (1012013)Page 3 of 6 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A 0RA FT Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-7 11/2/2011 318 + Upper Galena-Platteville AR-7 1/6/2012 234 + Upper Galena-Platteville AR-7 3/2/2012 175 U Upper Galena-Platteville AR-7 5/14/2012 200 U Upper Galena-Platteville AR-7 8/20/2012 182 + Upper Galena-Platteville AR-7 10/16/2012 191 + Upper Galena-Platteville AR-7 3/18/2013 245 + Upper Galena-Platteville AR-8 4/27/2006 161 U Upper Galena-Platteville AR-8 10/30/2006 192 U Upper Galena-Platteville AR-8 4/15/2007 152 U Upper Galena-Platteville AR-8 10/8/2007 180 U Upper Galena-Platteville AR-8 6/2/2008 185 U Upper Galena-Platteville AR-8 9/30/2008 169 U Upper Galena-Platteville AR-8 4/27/2009 151 U Upper Galena-Platteville AR-8 10/13/2009 163 U Upper Galena-Platteville AR-8 5/17/2010 150 U Upper Galena-Platteville AR-8 10/21/2010 163 U Upper Galena-Platteville AR-8 3/7/2011 155 U Upper Galena-Platteville AR-8 5/3/2011 187 U Upper Galena-Platteville AR-8 7/19/2011 173 U Upper Galena-Platteville AR-8 11/2/2011 185 U Upper Galena-Platteville AR-8 3/6/2012 171 U Upper Galena-Platteville AR-8 5/14/2012 172 U Upper Galena-Platteville AR-8 8/20/2012 173 U Upper Galena-Platteville AR-8 10/16/2012 174 U Upper Galena-Platteville AR-8 3/18/2013 189 U Upper Galena-Platteville AR-9 4/27/2006 155 U Upper Galena-Platteville AR-9 10/30/2006 191 U Upper Galena-Platteville AR-9 4/20/2007 155 U Upper Galena-Platteville AR-9 10/8/2007 178 U Upper Galena-Platteville AR-9 6/2/2008 189 U Upper Galena-Platteville AR-9 9/30/2008 164 U Upper Galena-Platteville AR-9 4/27/2009 153 U Upper Galena-Platteville AR-9 10/13/2009 182 U Upper Galena-Platteville AR-9 5/17/2010 150 U Upper Galena-Platteville AR-9 10/22/2010 161 U Upper Galena-Platteville AR-9 3/7/2011 182 U Upper Galena-Platteville AR-9 5/3/2011 184 U Upper Galena-Platteville AR-9 7/19/2011 171 U Upper Galena-Platteville AR-9 11/2/2011 189 U Upper Galena-Platteville AR-9 3/6/2012 172 U Upper Galena-Platteville AR-9 5/14/2012 173 U Upper Galena-Platteville AR-9 8/20/2012 171 U Upper Galena-Platteville AR-9 10/16/2012 171 U Upper Galena-Platteville AR-9 3/18/2013 192 U Upper Galena-Platteville CAR-2 4/27/2006 159 U Upper Galena-Platteville CAR-2 11/2/2006 187 U Upper Galena-Platteville CAR-2 4/20/2007 152 U Upper Galena-Platteville CAR-2 10/8/2007 175 U Upper Galena-Platteville CAR-2 5/28/2008 191 U Upper Galena-Platteville CAR-2 10/1/2008 158 U Upper Galena-Platteville CAR-2 4/29/2009 NA U Upper Galena-Platteville CAR-3 4/27/2006 150 U Upper Galena-Platteville CAR-3 10/30/2006 198 U Upper Galena-Platteville CAR-3 4/15/2007 157 U Upper Galena-Platteville CAR-3 10/8/2007 178 U Upper Galena-Platteville CAR-3 6/2/2008 185 U Upper Galena-Platteville CAR-3 9/30/2008 167 U Upper Galena-Platteville CAR-3 4/27/2009 153 U Upper Galena-Platteville CAR-3 10/13/2009 191 U Upper Galena-Platteville CAR-3 5/17/2010 158 U Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (1 Q 2013)Page 4 of 6 Byron Generating Station Exelon Corporation Appendix A DRA FT Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer CAR-3 10/21/2010 160 U Upper Galena-Platteville CAR-3 3/7/2011 151 U Upper Galena-Platteville CAR-3 5/3/2011 184 U Upper Galena-Platteville CAR-3 7/19/2011 170 U Upper Galena-Platteville CAR-3 11/2/2011 166 U Upper Galena-Platteville CAR-3 3/6/2012 171 U Upper Galena-Platteville CAR-3 5/14/2012 174 U Upper Galena-Platteville CAR-3 8/20/2012 172 U Upper Galena-Platteville CAR-3 10/16/2012 175 U Upper Galena-Platteville CAR-3 3/18/2013 188 U Upper Galena-Platteville DF-13 4/26/2006 158 U Upper Galena-Platteville DF-19 4/25/2006 187 U Upper Galena-Platteville DF-1S 4/25/2006 185 U Upper Galena-Platteville DF-24 4/26/2006 162 U Upper Galena-Platteville DF-24 11/21/2006 191 U Upper Galena-Platteville DF-24 4/19/2007 170 U Upper Galena-Platteville DF-24 10/10/2007 179 U Upper Galena-Platteville DF-24 5/28/2008 188 U Upper Galena-Platteville DF-24 10/1/2008 167 U Upper Galena-Platteville DF-24 4/29/2009 154 U Upper Galena-Platteville DF-24 10/14/2009 170 U Upper Galena-Platteville DF-24 5/19/2010 157 U Upper Galena-Platteville DF-24 10/21/2010 157 U Upper Galena-Platteville DF-24 3/7/2011 152 U Upper.Galena-Platteville DF-24 5/9/2011 185 U Upper Galena-Platteville DF-24 7/20/2011 170 U Upper Galena-Platteville DF-24 11/2/2011 184 U Upper Galena-Platteville DF-24 3/7/2012 173 U Upper Galena-Platteville DF-24 5/16/2012 167 U Upper Galena-Platteville DF-24 8/15/2012 194 U Upper Galena-Platteville DF-24 10/17/2012 158 U Upper Galena-Platteville DF-24 3/20/2013 187 U Upper Galena-Platteville DF-2S 4/25/2006 186 U Upper Galena-Platteville DF-3S 4/25/2006 190 U Upper Galena-Platteville DF-4DS 4/25/2006 191 U Upper Galena-Platteville GW-9 4/28/2006 159 U Upper Galena-Platteville GW-9 11/21/2006 190 U Upper Galena-Platteville GW-9 4/21/2007 168 U Upper Galena-Platteville GW-9 10/10/2007 175 U Upper Galena-Platteville GW-9 5/29/2008 181 U Upper Galena-Platteville GW-9 10/2/2008 163 U Upper Galena-Platteville GW-9 4/29/2009 NA U Upper Galena-Platteville MW-1 4/26/2006 189 U Upper Galena-Platteville MW-1 11/1/2006 186 U Upper Galena-Platteville MW-1 4/19/2007 149 U Upper Galena-Platteville MW-1 10/8/2007 176 U Upper Galena-Platteville MW-1 5/29/2008 186 U Upper Galena-Platteville MW-1 10/1/2008 172 U Upper Galena-Platteville MW-1 4/29/2009 NA U Upper Galena-Platteville MW-1 5/16/2012 167 U Upper Galena-Platteville MW-1 10/17/2012 160 U Upper Galena-Platteville MW-3 4/26/2006 182 U Upper Galena-Platteville MW-3 11/1/2006 186 U Upper Galena-Platteville MW-3 4/19/2007 158 U Upper Galena-Platteville MW-3 10/8/2007 177 U Upper Galena-Platteville MW-3 5/29/2008 186 U Upper Galena-Platteville MW-3 10/1/2008 Dry Upper Galena-Platteville MW-3 5/16/2012 163 U Upper Galena-Platteville MW-3 10/17/2012 157 U Upper Galena-Platteville MW-30 4/28/2006 160 U Upper Galena-Platteville PC-1 B 4/26/2006 161 U Upper Galena-Platteville Byron Change Tables (1Q 2013)Page 5 of 6 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A D AFT Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer PC-2B 4/25/2006 175 U Upper Galena-Platteville PC-5B 4/26/2006 165 U Upper Galena-Platteville PC-6B 4/26/2006 165 U Upper Galena-Platteville WELL-7 4/27/2006 164 U Upper Galena-Platteville WELL-7 4/27/2006 159 U Upper Galena-Platteville WELL-7 10/10/2007 189 U Upper Galena-Platteville WELL-7 5/29/2008 186 U Upper Galena-Platteville WELL-7 10/2/2008 150 U Upper Galena-Platteville WELL-7 4/29/2009 NA U Upper Galena-Platteville AR-11 4/26/2006 2,340 + Lower Galena-Platteville AR-11 11/21/2006 1,780 + Lower Galena-Platteville AR-11 11/21/2006 1,710 + Lower Galena-Platteville AR- 1 11/21/2006 2,070 + Lower Galena-Platteville AR-1l 11/21/2006 1,860 + Lower Galena-Platteville AR-11 4/23/2007 1,820 + Lower Galena-Platteville AR-11 10/10/2007 1,300 + Lower Galena-Platteville AR-11 5/28/2008 1,220 + Lower Galena-Platteville AR-11 10/1/2008 1,280 + Lower Galena-Platteville AR-1l 4/29/2009 1,110 + Lower Galena-Platteville AR-11 10/15/2009 1,010 + Lower Galena-Platteville AR-11 5/20/2010 1,120 + Lower Galena-Platteville AR-11 10/21/2010 947 + Lower Galena-Platteville AR-11 3/7/2011 827 + Lower Galena-Platteville AR-11 5/9/2011 919 + Lower Galena-Platteville AR-11 7/20/2011 1,150 + Lower Galena-Platteville AR-1l 11/2/2011 894 + Lower Galena-Platteville AR-1l 3/7/2012 1,100 + Lower Galena-Platteville AR-11 5/16/2012 1,110 + Lower Galena-Platteville AR-11 8/15/2012 1,210 + Lower Galena-Platteville AR-11 10/17/2012 994 + Lower Galena-Platteville AR-11 3/20/2013 850 + Lower Galena-Platteville DF-12 4/25/2006 175 U Lower Galena-Platteville DF-iD 4/25/2006 176 U Lower Galena-Platteville DF-6 4/25/2006 176 U Lower Galena-Platteville MW-36 4/25/2006 176 U Lower Galena-Platteville MW-2 4/27/2006 157 U St. Peter Sandstone MW-37 4/26/2006 158 U St. Peter Sandstone MW-39 4/26/2006 158 U St. Peter Sandstone PC-1C 4/26/2006 164 U St. Peter Sandstone All concentrations presented In pico-curles per liter.Explanation:

2,340 -Bold concentrations represent exceedences of the Lower Limit of Detection of 200 pico-curies per liter.U -Tritium not detected above the laboratory detection limit.+ -Tritium detected above the laboratory detection limit.AMO Environmental Decisions Byron Change Tables (10 2013)Page 6 of 6 Byron Generating Station Exelon Corporation Appendix B DRAFi Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer DF-75 4/24/2006 Not Measured Shallow Overburden TW-13 4/27/2006 683.36 Shallow Overburden TW-13 11/1/2006 683.05 Shallow Overburden TW-13 4/20/2007 Not Measured Shallow Overburden TW-13 10/8/2007 682.84 Shallow Overburden TW-13 5/28/2008 683.86 Shallow Overburden TW-13 9/29/2008 683.57 Shallow Overburden TW-13 4/29/2009 684.26 Shallow Overburden TW-13 10/14/2009 683.38 Shallow Overburden TW-13 5/17/2010 684.22 Shallow Overburden TW-13 10/21/2010 683.27 Shallow Overburden TW-13 3/8/2011 683.70 Shallow Overburden TW-13 5/9/2011 682.83 Shallow Overburden TW-13 7/20/2011 683.26 Shallow Overburden TW-13 11/2/2011 682.97 Shallow Overburden TW-13 3/7/2012 683.20 Shallow Overburden TW-13 5/16/2012 683.26 Shallow Overburden TW-13 8/15/2012 682.86 Shallow Overburden TW-13 10/17/2012 682.86 Shallow Overburden TW-13 3/18/2013 683.19 Shallow Overburden TW-14 4/27/2006 672.93 Shallow Overburden TW-14 11/1/2006 672.11 Shallow Overburden TW-14 4/20/2007 Not Measured Shallow Overburden TW-14 10/8/2007 672.41 Shallow Overburden TW-14 5/28/2008 674.46 Shallow Overburden TW-14 9/29/2008 672.71 Shallow Overburden TW-14 4/29/2009 677.15 Shallow Overburden TW-14 10/14/2009 672.39 Shallow Overburden TW-14 5/17/2010 676.96 Shallow Overburden TW-14 10/21/2010 672.05 Shallow Overburden TW-14 318/2011 674.55 Shallow Overburden TW-14 5/7/2011 675.10 Shallow Overburden TW-14 7/20/2011 672.00 Shallow Overburden TW-14 11/2/2011 671.66 Shallow Overburden TW-15 4/27/2006 672.89 Shallow Overburden TW-15 11/1/2006 672.01 Shallow Overburden TW-15 4/20/2007 Not Measured Shallow Overburden TW-15 10/8/2007 672.48 Shallow Overburden TW-15 5/28/2008 674.46 Shallow Overburden TW-15 9/29/2008 672.73 Shallow Overburden TW-15 4/29/2009 677.12 Shallow Overburden TW-15 10/14/2009 672.38 Shallow Overburden TW-15 5/17/2010 676.93 Shallow Overburden TW-15 10/21/2010 672.03 Shallow Overburden TW-15 3/8/2011 674.53 Shallow Overburden TW-15 5/7/2011 675.05 Shallow Overburden TW-15 7/20/2011 671.97 Shallow Overburden TW-15 11/2/2011 671.63 Shallow Overburden CAR-1 3/23/2006 672.22 Upper Unconsolidated CAR-I 4/4/2006 672.20 Upper Unconsolidated CAR-1 4/27/2006 672.63 Upper Unconsolidated CAR-1 11/1/2006 671.92 Upper Unconsolidated CAR-1 4/20/2007 Not Measured Upper Unconsolidated CAR-1 10/8/2007 667.37 Upper Unconsolidated CAR-I 5/28/2008 673.79 Upper Unconsolidated CAR-I 9/29/2008 672.37 Upper Unconsolidated CAR-I 4/29/2009 675.99 Upper Unconsolidated CAR-1 10/14/2009 672.00 Upper Unconsolidated CAR-1 5/17/2010 675.82 Upper Unconsolidated Byron Change Tables (1 Q 2013)Page 1 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B DRAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer CAR-I 10/20/2010 671.70 Upper Unconsolidated CAR-I 3/8/2011 674.06 Upper Unconsolidated CAR-1 5/9/2011 674.10 Upper Unconsolidated CAR-1 7/20/2011 671.60 Upper Unconsolidated CAR-1 11/2/2011 671.41 Upper Unconsolidated CAR-1 3/7/2012 672.48 Upper Unconsolidated CAR-1 5/16/2012 672.40 Upper Unconsolidated CAR-i 8/15/2012 670.69 Upper Unconsolidated CAR-1 10/17/2012 670.70 Upper Unconsolidated CAR-1 3/18/2013 674.55 Upper Unconsolidated DF-7D 4/24/2006 675.08 Middle Unconsolidated AR-1 3/23/2006 831.40 Upper Galena-Platteville AR-1 4/4/2006 831.38 Upper Galena-Platteville AR-1 4/26/2006 835.94 Upper Galena-Platteville AR-1 11/1/2006 833.22 Upper Galena-Platteville AR-A 4/20/2007 Not Measured Upper Galena-Platteville AR-A 6/2/2008 837.43 Upper Galena-Platteville AR-1 9/29/2008 838.69 Upper Galena-Platteville AR-i 4/29/2009 837.55 Upper Galena-Platteville AR-A 10/13/2009 836.24 Upper Galena-Platteville AR-i 5/17/2010 834.98 Upper Galena-Platteville AR-i 10/22/2010 832.90 Upper Galena-Platteville AR-A 3/7/2011 832.92 Upper Galena-Platteville AR-1 5/9/2011 835.71 Upper Galena-Platteville AR-1 7/19/2011 834.28 Upper Galena-Platteville AR-1 11/2/2011 834.07 Upper Galena-Platteville AR-1 3/6/2012 830.95 Upper Galena-Platteville AR-1 5/14/2012 832.14 Upper Galena-Platteville AR-i 8/20/2012 829.59 Upper Galena-Platteville AR-A 10/16/2012 828.57 Upper Galena-Platteville AR-i 3/18/2013 831.09 Upper Galena-Platteville AR-10 4/26/2006 837.66 Upper Galena-Platteville AR-10 11/1/2006 837.45 Upper Galena-Platteville AR-10 4/15/2007 Not Measured Upper Galena-Platteville AR-10 6/2/2008 842.97 Upper Galena-Platteville AR-10 9/29/2008 842.13 Upper Galena-Platteville AR-10 10/1/2008 842.13 Upper Galena-Platteville AR-10 4/29/2009 843.90 Upper Galena-Platteville AR-10 10/13/2009 842.30 Upper Galena-Platteville AR-10 5/17/2010 843.01 Upper Galena-Platteville AR-10 10/22/2010 841.06 Upper Galena-Platteville AR-i0 3/7/2011 839.44 Upper Galena-Platteville AR-10 5/9/2011 841.10 Upper Galena-Platteville AR-i0 7/19/2011 840.75 Upper Galena-Platteville AR-10 11/2/2011 839.52 Upper Galena-Platteville AR-10 3/6/2012 838.61 Upper Galena-Platteville AR-10 5/14/2012 838.90 Upper Galena-Platteville AR-10 8/20/2012 837.04 Upper Galena-Platteville AR-10 10/16/2012 836.40 Upper Galena-Platteville AR-10 3/18/2013 835.76 Upper Galena-Platteville AR-2 3/23/2006 798.68 Upper Galena-Platteville AR-2 4/4/2006 798.31 Upper Galena-Platteville AR-2 4/26/2006 798.50 Upper Galena-Platteville AR-2 11/1/2006 797.48 Upper Galena-Platteville AR-2 4/18/2007 Not Measured Upper Galena-Platteville AR-2 10/8/2007 803.96 Upper Galena-Platteville AR-2 5/29/2008 812.58 Upper Galena-Platteville AR-2 9/29/2008 811.18 Upper Galena-Platteville AR-2 4/29/2009 818.53 Upper Galena-Platteville Byron Change Tables (IQ 2013)Page 2 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B DRAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-2 10/13/2009 812.98 Upper Galena-Platteville AR-2 5/17/2010 818.47 Upper Galena-Platteville AR-2 10/20/2010 815.67 Upper Galena-Platteville AR-2 3/7/2011 809.56 Upper Galena-Platteville AR-2 5/9/2011 817.03 Upper Galena-Platteville AR-2 7/20/2011 828.53 Upper Galena-Platteville AR-2 11/2/2011 813.87 Upper Galena-Platteville AR-2 3/7/2012 809.18 Upper Galena-Platteville AR-2 5/16/2012 824.77 Upper Galena-Platteville AR-2 8/15/2012 816.79 Upper Galena-Platteville AR-2 10/17/2012 817.16 Upper Galena-Platteville AR-2 3/18/2013 808.18 Upper Galena-Platteville AR-3 3/23/2006 798.16 Upper Galena-Platteville AR-3 4/4/2006 797.49 Upper Galena-Platteville AR-3 4/26/2006 796.87 Upper Galena-Platteville AR-3 11/1/2006 796.14 Upper Galena-Platteville AR-3 4/18/2007 Not Measured Upper Galena-Platteville AR-3 10/8/2007 802.31 Upper Galena-Platteville AR-3 5/29/2008 804.84 Upper Galena-Platteville AR-3 9/29/2008 803.14 Upper Galena-Platteville AR-3 4/29/2009 806.32 Upper Galena-Platteville AR-3 10/14/2009 804.10 Upper Galena-Platteville AR-3 5/17/2010 805.29 Upper Galena-Platteville AR-3 10/20/2010 804.62 Upper Galena-Platteville AR-3 3/7/2011 807.64 Upper Galena-Platteville AR-3 5/9/2011 804.49 Upper Galena-Platteville AR-3 7/20/2011 805.32 Upper Galena-Platteville AR-3 11/2/2011 803.72 Upper Galena-Platteville AR-3 3/7/2012 803.41 Upper Galena-Platteville AR-3 5/16/2012 803.73 Upper Galena-Platteville AR-3 8/15/2012 803.14 Upper Galena-Platteville AR-3 10/17/2012 802.79 Upper Galena-Platteville AR-3 3/18/2013 802.38 Upper Galena-Platteville AR-4 4/27/2006 742.74 Upper Galena-Platteville AR-4 11/21/2006 740.67 Upper Galena-Platteville AR-4 4/23/2007 Not Measured Upper Galena-Platteville AR-4 10/10/2007 744.24 Upper Galena-Platteville AR-4 5/28/2008 748.14 Upper Galena-Platteville AR-4 9/29/2008 744.64 Upper Galena-Platteville AR-4 4/29/2009 753.48 Upper Galena-Platteville AR-4 10/15/2009 745.02 Upper Galena-Platteville AR-4 5/17/2010 751.73 Upper Galena-Platteville AR-4 10/21/2010 743.84 Upper Galena-Platteville AR-4 3/7/2011 743.54 Upper Galena-Platteville AR-4 5/9/2011 749.44 Upper Galena-Platteville AR-4 7/20/2011 745.27 Upper Galena-Platteville AR-4 11/2/2011 743.37 Upper Galena-Platteville AR-4 3/7/2012 743.47 Upper Galena-Platteville AR-4 5/16/2012 744.84 Upper Galena-Platteville AR-4 8/15/2012 741.62 Upper Galena-Platteville AR-4 10/17/2012 740.53 Upper Galena-Platteville AR-4 3/18/2013 740.94 Upper Galena-Platteville AR-5 3/23/2006 687.90 Upper Galena-Platteville AR-5 4/4/2006 689.06 Upper Galena-Platteville AR-5 4/27/2006 688.08 Upper Galena-Platteville AR-5 11/21/2006 687.75 Upper Galena-Platteville AR-5 4/21/2007 Not Measured Upper Galena-Platteville AR-5 10/10/2007 687.42 Upper Galena-Platteville AR-5 5/28/2008 689.00 Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (1Q 2013)Page 3 of 10 Byron Generating Station Exelon Corporation Appendixon

[RA FT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-5 9/29/2008 688.20 Upper Galena-Platteville AR-5 4/28/2009 690.95 Upper Galena-Platteville AR-5 10/14/2009 688.48 Upper Galena-Platteville AR-5 5/17/2010 690.67 Upper Galena-Platteville AR-5 10/20/2010 688.29 Upper Galena-Platteville AR-5 3/7/2011 689.40 Upper Galena-Platteville AR-5 5/7/2011 690.12 Upper Galena-Platteville AR-5 7/20/2011 688.35 Upper Galena-Platteville AR-5 11/2/2011 687.94 Upper Galena-Platteville AR-6 3/23/2006 674.47 Upper Galena-Platteville AR-6 4/4/2006 674.68 Upper Galena-Platteville AR-6 4/27/2006 675.00 Upper Galena-Platteville AR-6 11/21/2006 674.75 Upper Galena-Platteville AR-6 4/21/2007 Not Measured Upper Galena-Platteville AR-6 10/10/2007 675.22 Upper Galena-Platteville AR-6 5/28/2008 676.65 Upper Galena-Platteville AR-6 9/29/2008 675.70 Upper Galena-Platteville AR-6 4/28/2009 678.55 Upper Galena-Platteville AR-6 10/14/2009 675.45 Upper Galena-Platteville AR-6 5/17/2010 679.35 Upper Galena-Platteville AR-6 10/20/2010 675.29 Upper Galena-Platteville AR-6 3/7/2011 676.60 Upper Galena-Platteville AR-6 5/7/2011 677.34 Upper Galena-Platteville AR-6 7/20/2011 675.26 Upper Galena-Platteville AR-6 11/2/2011 674.87 Upper Galena-Platteville AR-7 4/4/2006 765.96 Upper Galena-Platteville AR-7 4/27/2006 766.74 Upper Galena-Platteville AR-7 10/30/2006 768.42 Upper Galena-Platteville AR-7 4/15/2007 Not Measured Upper Galena-Platteville AR-7 6/2/2008 787.88 Upper Galena-Platteville AR-7 9/29/2008 786.38 Upper Galena-Platteville AR-7 10/1/2008 786.38 Upper Galena-Platteville AR-7 4/29/2009 793.61 Upper Galena-Platteville AR-7 10/13/2009 790.87 Upper Galena-Platteville AR-7 5/17/2010 791.71 Upper Galena-Platteville AR-7 10/21/2010 790.58 Upper Galena-Platteville AR-7 3/7/2011 781.11 Upper Galena-Platteville AR-7 5/9/2011 784.63 Upper Galena-Platteville AR-7 7/19/2011 787.14 Upper Galena-Platteville AR-7 11/2/2011 788.26 Upper Galena-Platteville AR-7 3/2/2012 781.82 Upper Galena-Platteville AR-7 5/14/2012 782.14 Upper Galena-Platteville AR-7 8/20/2012 778.32 Upper Galena-Platteville AR-7 10/16/2012 776.00 Upper Galena-Platteville AR-7 3/18/2013 775.88 Upper Galena-Platteville AR-8 4/4/2006 816.14 Upper Galena-Platteville AR-8 4/27/2006 838.55 Upper Galena-Platteville AR-8 10/30/2006 836.86 Upper Galena-Platteville AR-8 4/15/2007 Not Measured Upper Galena-Platteville AR-8 6/2/2008 848.56 Upper Galena-Platteville AR-8 9/29/2008 851.66 Upper Galena-Platteville AR-8 4/29/2009 Not Measured Upper Galena-Platteville AR-8 10/13/2009 851.76 Upper Galena-Platteville AR-8 5/17/2010 847.98 Upper Galena-Platteville AR-8 10/21/2010 847.71 Upper Galena-Platteville AR-8 3/7/2011 840.64 Upper Galena-Platteville AR-8 5/9/2011 842.76 Upper Galena-Platteville AR-8 7/19/2011 844.45 Upper Galena-Platteville AR-8 11/2/2011 845.01 Upper Galena-Platteville Byron Change Tables (1Q 2013)Page 4 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation np-%F pAppendix B tAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-8 3/6/2012 839.10 Upper Galena-Platteville AR-8 5/14/2012 839.24 Upper Galena-Platteville AR-8 8/20/2012 835.79 Upper Galena-Platteville AR-8 10/16/2012 833.30 Upper Galena-Platteville AR-8 3/18/2013 835.11 Upper Galena-Platteville AR-9 4/27/2006 850.40 Upper Galena-Platteville AR-9 10/30/2006 819.21 Upper Galena-Platteville AR-9 4/20/2007 Not Measured Upper Galena-Platteville AR-9 6/2/2008 830.88 Upper Galena-Platteville AR-9 9/29/2008 831.12 Upper Galena-Platteville AR-9 10/1/2008 831.12 Upper Galena-Platteville AR-9 4/29/2009 832.26 Upper Galena-Platteville AR-9 10/13/2009 833.11 Upper Galena-Platteville AR-9 5/17/2010 832.42 Upper Galena-Platteville AR-9 10/22/2010 832.63 Upper Galena-Platteville AR-9 3/7/2011 827.92 Upper Galena-Platteville AR-9 5/9/2011 830.39 Upper Galena-Platteville AR-9 7/19/2011 832.94 Upper Galena-Platteville AR-9 11/2/2011 829.95 Upper Galena-Platteville AR-9 3/6/2012 828.75 Upper Galena-Platteville AR-9 5/14/2012 828.95 Upper Galena-Platteville AR-9 8/20/2012 826.91 Upper Galena-Platteville AR-9 10/16/2012 825.42 Upper Galena-Platteville AR-9 3/18/2013 837.15 Upper Galena-Platteville CAR-2 3/23/2006 736.50 Upper Galena-Platteville CAR-2 4/4/2006 742.56 Upper Galena-Platteville CAR-2 4/27/2006 736.89 Upper Galena-Platteville CAR-2 11/2/2006 736.69 Upper Galena-Platteville CAR-2 4/20/2007 Not Measured Upper Galena-Platteville CAR-2 10/8/2007 735.43 Upper Galena-Platteville CAR-2 5/28/2008 736.81 Upper Galena-Platteville CAR-2 9/29/2008 736.61 Upper Galena-Platteville CAR-2 4/28/2009 743.39 Upper Galena-Platteville CAR-2 10/14/2009 737.05 Upper Galena-Platteville CAR-2 5/17/2010 742.61 Upper Galena-Platteville CAR-2 10/21/2010 734.90 Upper Galena-Platteville CAR-2 3/7/2011 742.66 Upper Galena-Platteville CAR-2 5/7/2011 740.87 Upper Galena-Platteville CAR-2 7/20/2011 735.51 Upper Galena-Platteville CAR-2 11/2/2011 735.17 Upper Galena-Platteville CAR-3 4/4/2006 824.62 Upper Galena-Platteville CAR-3 4/27/2006 826.52 Upper Galena-Platteville CAR-3 10/30/2006 828.33 Upper Galena-Platteville CAR-3 4/15/2007 Not Measured Upper Galena-Platteville CAR-3 6/2/2008 838.21 Upper Galena-Platteville CAR-3 9/29/2008 840.95 Upper Galena-Platteville CAR-3 10/1/2008 840.95 Upper Galena-Platteville CAR-3 4/29/2009 841.96 Upper Galena-Platteville CAR-3 10/13/2009 845.69 Upper Galena-Platteville CAR-3 5/17/2010 837.87 Upper Galena-Platteville CAR-3 10/21/2010 837.36 Upper Galena-Platteville CAR-3 3/7/2011 834.92 Upper Galena-Platteville CAR-3 5/9/2011 844.36 Upper Galena-Platteville CAR-3 7/19/2011 834.20 Upper Galena-Platteville CAR-3 11/2/2011 835.29 Upper Galena-Platteville CAR-3 3/6/2012 833.94 Upper Galena-Platteville CAR-3 5/14/2012 833.11 Upper Galena-Platteville CAR-3 8/20/2012 828.57 Upper Galena-Platteville CAR-3 10/16/2012 831.07 Upper Galena-Platteville Byron Change Tables (10 2013)Page 5 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B DRAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer CAR-3 3/18/2013 850.75 Upper Galena-Platteville DF-10 4/24/2006 Not Measured Upper Galena-Platteville DF-11 4/24/2006 749.00 Upper Galena-Platteville DF-15 3/23/2006 745.49 Upper Galena-Platteville DF-15 4/4/2006 740.47 Upper Galena-Platteville DF-15 4/24/2006 740.98 Upper Galena-Platteville DF-18 3/23/2006 724.68 Upper Galena-Platteville DF-18 4/4/2006 724.80 Upper Galena-Platteville DF-18 4/24/2006 725.72 Upper Galena-Platteville DF-19 3/23/2006 724.51 Upper Galena-Platteville DF-19 4/4/2006 724.63 Upper Galena-Platteville DF-19 4/25/2006 725.60 Upper Galena-Platteville DF-iS 3/23/2006 724.97 Upper Galena-Platteville DF-iS 4/4/2006 725.09 Upper Galena-Platteville DF-iS 4/25/2006 726.04 Upper Galena-Platteville DF-22S 3/23/2006 735.86 Upper Galena-Platteville DF-22S 4/4/2006 725.99 Upper Galena-Platteville DF-22S 4/24/2006 726.34 Upper Galena-Platteville DF-24 3/23/2006 722.40 Upper Galena-Platteville DF-24 4/4/2006 722.57 Upper Galena-Platteville DF-24 4/26/2006 723.79 Upper Galena-Platteville DF-24 11/21/2006 721.58 Upper Galena-Platteville DF-24 4/19/2007 Not Measured Upper Galena-Platteville DF-24 10/10/2007 724.51 Upper Galena-Platteville DF-24 5/28/2008 732.78 Upper Galena-Platteville DF-24 9/29/2008 726.33 Upper Galena-Platteville DF-24 4/29/2009 739.28 Upper Galena-Platteville DF-24 10/14/2009 728.22 Upper Galena-Platteville DF-24 5/17/2010 733.98 Upper Galena-Platteville DF-24 10/21/2010 728.28 Upper Galena-Platteville DF-24 3/7/2011 726.35 Upper Galena-Platteville DF-24 5/9/2011 730.36 Upper Galena-Platteville DF-24 7/20/2011 726.98 Upper Galena-Platteville DF-24 11/2/2011 724.86 Upper Galena-Platteville DF-24 3/7/2012 724.71 Upper Galena-Platteville DF-24 5/16/2012 724.95 Upper Galena-Platteville DF-24 8/15/2012 724.42 Upper Galena-Platteville DF-24 10/17/2012 722.54 Upper Galena-Platteville DF-24 3/18/2013 725.17 Upper Galena-Platteville DF-2S 3/23/2006 725.48 Upper Galena-Platteville DF-2S 4/4/2006 725.96 Upper Galena-Platteville DF-2S 4/25/2006 727.08 Upper Galena-Platteville DF-3S 3/23/2006 726.28 Upper Galena-Platteville DF-3S 4/4/2006 726.36 Upper Galena-Platteville DF-3S 4/25/2006 727.33 Upper Galena-Platteville DF-4DS 4/25/2006 765.82 Upper Galena-Platteville DF-5S 4/24/2006 799.77 Upper Galena-Platteville GW-9 4/28/2006 745.46 Upper Galena-Platteville GW-9 11/21/2006 749.73 Upper Galena-Platteville GW-9 4/21/2007 Not Measured Upper Galena-Platteville GW-9 10/10/2007 752.23 Upper Galena-Platteville GW-9 5/29/2008 761.88 Upper Galena-Platteville GW-9 5/29/2008 761.88 Upper Galena-Platteville GW-9 9/29/2008 748.23 Upper Galena-Platteville GW-9 4/28/2009 758.93 Upper Galena-Platteville GW-9 10/14/2009 760.63 Upper Galena-Platteville GW-9 5/17/2010 760.33 Upper Galena-Platteville GW-9 10/21/2010 743.58 Upper Galena-Platteville GW-9 3/9/2011 754.81 Upper Galena-Platteville Byron Change Tables (1Q 2013)Page 6 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B DRAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer GW-9 5/10/2011 755.97 Upper Galena-Platteville GW-9 7/20/2011 753.17 Upper Galena-Platteville GW-9 11/2/2011 754.86 Upper Galena-Platteville MW-1 3/23/2006 799.95 Upper Galena-Platteville MW-1 4/4/2006 800.76 Upper Galena-Platteville MW-1 4/26/2006 799.63 Upper Galena-Platteville MW-1 11/1/2006 798.62 Upper Galena-Platteville MW-i 4/19/2007 Not Measured Upper Galena-Platteville MW-i 10/8/2007 804.27 Upper Galena-Platteville MW-i 5/29/2008 812.12 Upper Galena-Platteville MW-i 9/29/2008 808.42 Upper Galena-Platteville MW-i 4/28/2009 819.37 Upper Galena-Platteville MW-i 10/14/2009 812.05 Upper Galena-Platteville MW-i 5/17/2010 Not Measured Upper Galena-Platteville MW-i 10/21/2010 814.17 Upper Galena-Platteville MW-1 3/7/2011 807.40 Upper Galena-Platteville MW-i 5/7/2011 808.37 Upper Galena-Platteville MW-1 7/20/2011 Not Accessible Upper Galena-Platteville MW-i 11/2/2011 Not Measured Upper Galena-Platteville MW-i 3/7/2012 806.45 Upper Galena-Platteville MW-i 5/16/2012 806.57 Upper Galena-Platteville MW-i 8/15/2012 807.70 Upper Galena-Platteville MW-i 10/17/2012 807.66 Upper Galena-Platteville MW-i 3/18/2013 803.34 Upper Galena-Platteville MW-15 3/23/2006 743.98 Upper Galena-Platteville MW-15 4/4/2006 744.21 Upper Galena-Platteville MW-15 4/24/2006 745.56 Upper Galena-Platteville MW-3 4/26/2006 787.51 Upper Galena-Platteville MW-3 11/1/2006 786.00 Upper Galena-Platteville MW-3 4/19/2007 Not Measured Upper Galena-Platteville MW-3 10/8/2007 789.27 Upper Galena-Platteville MW-3 5/29/2008 790.45 Upper Galena-Platteville MW-3 9/29/2008 Dry Upper Galena-Platteville MW-3 4/28/2009 791.15 Upper Galena-Platteville MW-3 10/14/2009 798.65 Upper Galena-Platteville MW-3 5/17/2010 Not Measured Upper Galena-Platteville MW-3 10/21/2010 789.74 Upper Galena-Platteville MW-3 3/7/2011 788.99 Upper Galena-Platteville MW-3 5/7/2011 790.19 Upper Galena-Platteville MW-3 7/20/2011 790.08 Upper Galena-Platteville MW-3 11/2/2011 789.15 Upper Galena-Platteville MW-3 3/7/2012 788.48 Upper Galena-Platteville MW-3 5/16/2012 788.51 Upper Galena-Platteville MW-3 8/15/2012 788.74 Upper Galena-Platteville MW-3 10/17/2012 788.55 Upper Galena-Platteville MW-3 3/18/2013 786.48 Upper Galena-Platteville MW-30 3/23/2006 720.41 Upper Galena-Plattevilfe MW-30 4/28/2006 720.26 Upper Galena-Platteville PC-1 B 3/23/2006 717.21 Upper Galena-Platteville PC-1B 4/4/2006 717.25 Upper Galena-Platteville PC-1B 4/26/2006 718.01 Upper Galena-Platteville PC-2B 4/4/2006 756.28 Upper Galena-Platteville PC-2B 4/25/2006 756.23 Upper Galena-Platteville PC-3B 4/24/2006 760.58 Upper Galena-Platteville PC-4B 3/23/2006 726.15 Upper Galena-Platteville PC-4B 4/4/2006 726.27 Upper Galena-Platteville PC-4B 4/24/2006 726.49 Upper Galena-Platteville PC-5B 3/23/2006 722.91 Upper Galena-Platteville PC-5B 4/4/2006 722.47 Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (10 2013)Page 7 of 10 Byron Generating Station Exelon Corporation Appendix B DRoAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer PC-SB 4/26/2006 723.60 Upper Galena-Platteville PC-6B 3/23/2006 749.82 Upper Galena-Platteville PC-6B 4/4/2006 740.58 Upper Galena-Platteville PC-6B 4/26/2006 743.18 Upper Galena-Platteville WELL-7 4/27/2006 775.47 Upper Galena-Platteville WELL-7 11/21/2006 784.24 Upper Galena-Platteville WELL-7 10/10/2007 789.24 Upper Galena-Platteville WELL-7 5/29/2008 803.94 Upper Galena-Platteville WELL-7 9/29/2008 784.74 Upper Galena-Platteville WELL-7 4/28/2009 805.04 Upper Galena-Platteville WELL-7 10/14/2009 809.92 Upper Galena-Platteville WELL-7 5/17/2010 808.64 Upper Galena-Platteville WELL-7 10/21/2010 803.79 Upper Galena-Platteville WELL-7 3/7/2011 810.34 Upper Galena-Platteville WELL-7 5/7/2011 810.09 Upper Galena-Platteville WELL-7 7/20/2011 805.48 Upper Galena-Platteville WELL-7 11/2/2011 801.82 Upper Galena-Platteville WELL-7 3/7/2012 793.58 Upper Galena-Platteville WELL-7 5/16/2012 801.59 Upper Galena-Platteville WELL-7 8/15/2012 790.65 Upper Galena-Platteville WELL-7 10/17/2012 808.52 Upper Galena-Platteville WELL-7 3/18/2013 809.81 Upper Galena-Platteville AR-11 4/26/2006 742.41 Lower Galena-Platteville AR-11 11/21/2006 732.75 Lower Galena-Platteville AR-11 4/23/2007 Not Measured Lower Galena-Platteviile AR-11 10/10/2007 721.23 Lower Galena-Platteville AR-11 5/28/2008 744.80 Lower Galena-Platteville AR-11 9/29/2008 741.70 Lower Galena-Platteville AR-11 4/29/2009 748.59 Lower Galena-Platteville AR-11 10/15/2009 742.47 Lower Galena-Platteville AR-11 5/17/2010 747.35 Lower Galena-Platteville AR-11 10/21/2010 743.30 Lower Galena-Platteville AR-11 3/7/2011 742.80 Lower Galena-Platteville AR-11 5/9/2011 747.64 Lower Galena-Platteville AR-1 1 7/20/2011 744.43 Lower Galena-Platteville AR-1 1 11/2/2011 744.78 Lower Galena-Platteville AR-11 3/7/2012 744.88 Lower Galena-Platteville AR-1 1 5/16/2012 745.74 Lower Galena-Platteville AR- 1 8/15/2012 743.05 Lower Galena-Platteville AR- 1 10/17/2012 742.03 Lower Galena-Platteville AR-1 1 3/18/2013 742.34 Lower Galena-Platteville DF-12 3/23/2006 744.35 Lower Galena-Platteville DF-12 4/25/2006 746.06 Lower Galena-Platteville DF-13 3/23/2006 744.39 Lower Galena-Platteville DF-13 4/4/2006 744.68 Lower Galena-Platteville DF-13 4/26/2006 746.06 Lower Galena-Platteville DF-17 3/23/2006 729.14 Lower Galena-Platteville DF-1 7 4/4/2006 729.27 Lower Galena-Platteville DF-1 7 4/24/2006 729.76 Lower Galena-Platteville DF-1 D 3/23/2006 724.56 Lower Galena-Platteville DF-iD 4/4/2006 724.73 Lower Galena-Platteville DF-iD 4/25/2006 725.67 Lower Galena-Platteville NF-22D 3/23/2006 725.78 Lower Galena-Platteville DF-22D 4/24/2006 726.34 Lower Galena-Platteville DF-23 3/23/2006 726.66 Lower Galena-Platteville DF-23 4/4/2006 695.37 Lower Galena-Platteville DF-23 4/24/2006 717.17 Lower Galena-Platteville DF-4DD 3/23/2006 744.49 Lower Galena-Platteville DF-4DD 4/4/2006 744.78 Lower Galena-Platteville AMO Environmental Decisions Byron Change Tables (10 2013)Page 8 of 10 Byron Generating Station Exelon Corporation Appendix B IJ o FT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer DF-4DD 4/24/2006 746.17 Lower Galena-Platteville DF-6 3/23/2006 737.18 Lower Galena-Platteville DF-6 4/4/2006 738.17 Lower Galena-Platteville DF-6 4/25/2006 739.20 Lower Galena-Platteville DF-8 3/23/2006 716.90 Lower Galena-Platteville DF-8 4/4/2006 717.00 Lower Galena-Platteville DF-8 4/24/2006 717.60 Lower Galena-Platteville MW-16 3/23/2006 743.93 Lower Galena-Platteville MW-16 4/4/2006 744.19 Lower Galena-Platteville MW-16 4/24/2006 745.56 Lower Galena-Platteville MW-36 3/23/2006 744.47 Lower Galena-Platteville MW-36 4/4/2006 744.73 Lower Galena-Platteville MW-36 4/25/2006 746.14 Lower Galena-Platteville MW-41 3/23/2006 743.85 Lower Galena-Platteville MW-41 4/4/2006 744.13 Lower Galena-Platteville MW-41 4/24/2006 745.49 Lower Galena-Platteville MW-42 3/23/2006 744.14 Lower Galena-Platteville MW-42 4/4/2006 744.47 Lower Galena-Platteville MW-42 4/24/2006 745.85 Lower Galena-Platteville MW-2 3/23/2006 683.62 St. Peter Sandstone MW-2 4/4/2006 684.18 St. Peter Sandstone MW-2 4/27/2006 684.22 St. Peter Sandstone MW-20R 3/23/2006 680.65 St. Peter Sandstone MW-20R 4/4/2006 680.73 St. Peter Sandstone MW-20R 4/24/2006 681.19 St. Peter Sandstone MW-21 3/23/2006 680.58 St. Peter Sandstone MW-21 4/4/2006 680.70 St. Peter Sandstone MW-21 4/24/2006 681.16 St. Peter Sandstone MW-37 3/23/2006 681.61 St. Peter Sandstone MW-37 4/4/2006 681.73 St. Peter Sandstone MW-37 4/26/2006 682.15 St. Peter Sandstone MW-39 3/23/2006 680.94 St. Peter Sandstone MW-39 4/4/2006 681.06 St. Peter Sandstone MW-39 4/26/2006 681.49 St. Peter Sandstone PC-1C 3/23/2006 678.99 St. Peter Sandstone PC-1C 4/4/2006 678.99 St. Peter Sandstone PC-1C 4/26/2006 679.53 St. Peter Sandstone DF-25 4/24/2006 769.11 Unknown DF-9S 3/23/2006 685.80 Unknown DF-9S 4/4/2006 686.08 Unknown MS-1 3/23/2006 694.03 Unknown MS-1 4/4/2006 693.34 Unknown MS-2 3/23/2006 676.91 Unknown MS-2 4/4/2006 676.78 Unknown MW-11 4/4/2006 713.67 Unknown MW-121 3/23/2006 704.92 Unknown MW-121 4/4/2006 704.90 Unknown MW12S 3/23/2006 704.45 Unknown MW12S 4/4/2006 706.29 Unknown OS-NW-1D 3/23/2006 676.20 Unknown OS-NW-1D 4/4/2006 743.12 Unknown OS-NW-1S 3/23/2006 742.60 Unknown OS-NW-1S 4/4/2006 774.16 Unknown OS-SW-1 3/23/2006 669.94 Unknown OS-SW-1 4/4/2006 678.43 Unknown OS-SW-2D 3/23/2006 679.76 Unknown OS-SW-2D 4/4/2006 679.89 Unknown OS-SW-21 3/23/2006 679.88 Unknown OS-SW-21 4/4/2006 680.00 Unknown Byron Change Tables (1Q 2013)Page 9 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B RA T Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer OS-SW-2S 3/23/2006 684.51 Unknown OS-SW-2S 4/4/2006 685.06 Unknown OS-SW-3D 3/23/2006 682.52 Unknown OS-SW-3D 4/4/2006 659.12 Unknown OS-SW-3S 3/23/2006 695.82 Unknown OS-SW-3S 4/4/2006 673.83 Unknown RR-10 4/4/2006 672.17 Unknown RR-9 3/23/2006 670.92 Unknown RR-9 4/4/2006 671.05 Unknown All Elevations Presented In Feet Above Mean Sea Level AMO Environmental Decisions Byron Change Tables (1 Q 2013)Page 10 of 10 LTi AMO Environmental Decisions PO Box 410 4327 Point Pleasant Pike Danboro, PA 18916 Environmental ,Decisions Geologists Hydrogeologists GIS Analysts Environmental Scientists 215-230-8282 215-230-8283 (Phone)(Fax)www.amoed com Earth & Environmental Resource Management Consultants

~ ~ £~July 17, 2013 Byron Generating Station Chemistry Manager/RGPP Coordinator 4450 North German Church Road Byron, Illinois

Subject:

May 2013 RGPP Summary Monitoring Report (2 nd Quarter 2013)AMO has interpreted the analytical data and field data for the May 2013 Radiological Groundwater Protection Program (RGPP) sampling round, which was completed by EIML (a third party vendor under contract with Exelon Corporation) between May 20, 2013 and May 22, 2013. Exelon's RGPP (EN-AA-408-4000 and EN-BY-408-4160) incorporates guidance as detailed in NEI 07-07, ANI 07-01, and EPRI 1015118.All laboratory and field data from this sampling round has been uploaded to the Exelon RGPP Database maintained by Locus Technologies.

The attached tables, graphs, and figures summarize the findings of the May 2013 sampling round. Overall, tritium concentrations have been decreasing at the Station since the 2006. Based on our review of the May 2013 sampling round and available historic data, there does not appear to be ongoing tritium leak at the site.The Station conformed with its RGPP during the 2 nd quarter 2013 with respect to sampling protocol.Please call me at 215-230-8282 if you have questions.

Respectfully, AMO Environmental Decisions Ralph T. Golia, P.G.Principal Hydrogeologist attachments File AMO Environmental Decisions 1 Byron 201305 (May) RGPP Report Cover Letter DRAFT Byron Generating Station Exelon Corporation Table I Radiological Groundwater Protection Plan Evaluation Checklist Station: Monitoring Round: Byron Generating Station Completed May 20 through May 22, 2013 Compliance Evaluation Evaluation Checklist Yes or No Explanation P.I.1 -Was depth to water collected at all monitoring locations?

YES 1 2- Were all required field data measurements collected?

YES 1 3 -Were all required sampling points sampled? YES See the attached Figures Ia and lb for sample 1 locations.

4 -Were all required analyses performed?

YES 1 5- Should there be changes to sampling frequency based on NO NA analytical data?6 -Should there be a well designation change based on analytical NO NA data?Total P.I. Score for the Quarter 4 Data Evaluation Data Evaluation Yes or No Explanation 1 -Are there tritium concentrations

>2,000 pCi/L, but <20,000 NO pCi/L?2 -Are there tritium concentrations

>20,000 pCi/L, but <100,000 NO pCi/L?3 -Are there tritium concentrations

>100,000 pCi/L? NO 4 -Are there increasing tritium concentration trends? NO 5 -Are there decreasing tritium concentration trends? YES The attached graphs for AR-4 and AR-1 1 show an overall decreasing tritium concentration trend since 2006.6 -Are non-tritium analytes detected greater than MDL? YES Gross-alpha (suspended) and gross-beta (suspended) were detected in the groundwater samples collected from AR-8 (0.843 pCi/L and 2.30 pCi/L, respectively) and AR-10 (3.78 pCi/L and 2.95 pCi/L, respectively).

Gross-beta (dissolved) was detected in eight groundwater samples with concentrations ranging between 2.37 pCi/L (AR-1)and 15.10 pCi/L (AR-7).The gross alpha and beta concentrations are believed to be from naturally occurring radon and radon decay AMO Environmental Decisions Last updated: 7/17/2013 Byron 201205 (May) Conformance Table DRAFT Byron Generating Station Exelon Corporation Table I Radiological Groundwater Protection Plan Evaluation Checklist dauahter Droducts and not due to licensed material.7 -Are there increasing non-tritium concentration trends? NA ___8 -Are there decreasing non-tritium concentration trends? NA 9- Are there increasing groundwater elevation trends? NO 10- Are there decreasing groundwater elevation trends? NO 11 -Are the significant changes to groundwater flow directions?

NO Notes: 1. P.I. -RGPP Performance Indicator.

A score of 0 indicates that the RGPP guidance was not followed.

A score of 1 indicates the RGPP guidance was followed.2 AMO Environmental Decisions Last updated: 7/17/2013 Byron 201205 (May) Conformance Table Byron Generating Station Exelon Corporation

-1st Quarter 2013 and 2nd Quarter 2013 Groundwater Tritium Concentrations and Change in Tritium Concentrations Change in Change in Sample ID Sample Round Result (pC/L) Qual Sample Round Result (pC/L) Qual Concentration Concentration Aquifer (pC/L) (%)TW-13 1st Qtr. 2013 Not Sampled 2nd Qtr. 2013 175 U NA NA Shallow Overburden CAR-A 1st Qtr. 2013 Not Sampled 2nd Qtr. 2013 179 U NA NA Upper Unconsolidated AR-4 1st Qtr. 2013 818 + 2nd Qtr. 2013 523 + -295 -44 Upper Galena-Platteville AR-1 1st Qtr. 2013 191 U 2nd Qtr. 2013 170 U 0 0 Upper Galena-Platteville AR-10 1st Qtr. 2013 187 U 2nd Qtr. 2013 173 U 0 0 Upper Galena-Platteville AR-2 1st Qtr. 2013 Not Sampled 2nd Qtr. 2013 166 U 0 0 Upper Galena-Platteville AR-3 1st Qtr. 2013 190 U 2nd Qtr. 2013 173 U 0 0 Upper Galena-Platteville AR-8 1st Qtr. 2013 189 U 2nd Qtr. 2013 178 U 0 0 Upper Galena-Platteville AR-9 1st Qtr. 2013 192 U 2nd Qtr. 2013 177 U 0 0 Upper Galena-Platteville CAR-3 1st Qtr. 2013 188 U 2nd Qtr. 2013 171 U 0 0 Upper Galena-Platteville DF-24 1st Qtr. 2013 187 U 2nd Qtr. 2013 178 U 0 0 Upper Galena-Platteville AR-7 1st Qtr. 2013 245 + 2nd Qtr. 2013 351 + 106 36 Upper Galena-Platteville MW-i Ist Qtr. 2013 Not Sampled 2nd Qtr. 2013 181 U NA NA Upper Galena-Platteville MW-3 1st Qtr. 2013 Not Sampled I 2nd Qtr. 2013 180 U NA NA Upper Galena-Platteville AR-11 1 st Qtr. 2013 850 + 2nd Qtr. 2013 933 + 83 9 Lower Galena-Platteville Notes: 1 ) Change in concentration (pC/I) represents the difference in concentrations between the 1st quarter 2013 and the 2nd quarter 2013 monitoring rounds unless otherwise noted. Positive numbers represent an increase in concentration; negative numbers represent a decrease in concentration.

2) All detections and detection limits less than 200 pico-curies per liter are considered equal to 200 pico-curies per liter for the purposes of this report.3) Change in concentration

(%) is equal to the change in concentration between the two sampling rounds divided by the average of the analytical results for the two sampling rounds.4) Data reported in the tables and figures does not include the results of re-analyses completed by the laboratory.

Only the highest analyte concentration per sample location is presented.

5) The five wells not sampled during the 1 st quarter 2013 RGPP sampling round are designated as background wells, which only require semi-annual sampling.AMO Environmental Decisions Byron Change Tables (20 2013)Page 1 of 1 Byron Generating Station Exelon Corporation I Quarter 2012 and 2nd Quarter 2013 DR P ~ Groundwater Elevations and Groundwater Elevation Changes 2nd Quarter 2nd Quarter Monitoring 2012 2013 Change in Groundwater Aquifer Well ID Groundwater Groundwater Elevation (ft)Elevation Elevation TW-13 683.26 683.72 0.46 Shallow Overburden CAR-1 672.40 673.92 1.52 Upper Unconsolidated AR-2 824.77 812.10 -12.67 Upper Galena-Platteville WELL-7 801.59 794.95 -6.64 Upper Galena-Platteville MW-3 788.51 786.74 -1.77 Upper Galena-Platteville MW-i 806.57 805.50 -1.07 Upper Galena-Platteville AR-3 803.73 804.10 0.37 Upper Galena-Platteville AR-4 744.84 746.57 1.73 Upper Galena-Platteville AR-10 838.90 840.64 1.74 Upper Galena-Platteville AR-7 782.14 785.43 3.29 Upper Galena-Platteville AR-i 832.14 835.99 3.85 Upper Galena-Platteville AR-8 839.24 843.20 3.96 Upper Galena-Platteville DF-24 724.95 729.26 4.31 Upper Galena-Platteville AR-9 828.95 833.55 4.60 Upper Galena-Platteville CAR-3 833.11 842.24 9.13 Upper Galena-Platteville AR-1l 745.74 747.47 1.73 Lower Galena-Platteville Explanation:

1 -Groundwater fluctuations in AR-7 have ranged between 765.96 feet amsl (April 2006) and 793.61 feet amsl (April 2009).2 -Groundwater fluctuations in AR-2 have ranged between 797.48 feet amsl (November 2006) and 828.53 feet amsl (July 2011).3- The elevated groundwater fluctuations in Well-7, CAR-3, and AR-9 are due to the Circulating Water System piping leak near Cooling Tower 1.Notes: 1) All groundwater elevations presented in feet above mean sea level.2) Change in groundwater elevation represents the difference in groundwater elevations between the 2nd quarter 2012 and 2nd quarter 2013 sampling rounds.AMO Environmental Decisions Byron Change Tables (2Q 2013)Page 1 of I DRAFT AR-4 Tritium Result vs. Groundwater Elevation-s--Tritium Result-- Groundwater Elevation 10,000 L)C.)0.0 U.E 1,000 1 758 756 754 E 752 V 0 750 748 746 *0 744 , 742 740 100--S 5...O ¢0 5 5.. ..- I*,.. ="5.- 5= -=O 5. == *. -) -5= 5- 55 -5 = .T -D Date'- '- '- '- '-00000 NC'J(N~C'l 55 5.= 55 -55'- '- '- '- '-=*5 5.= =*5 55~ --

DRAFT AR-7 Tritium Result vs. Groundwater Elevation Trend-4--$-Tritium Result --*-Groundwater Elevation 10,000 U 0.r- 1,000 0 E E p.6 800.00 795.00 790.00 14 E 785.00 r 2 0 780.00 .2 IJ i._0 775.00'0 770.00 765.00 760.00 I 100 Date A I t R RtA F T AR-11I Tritium Result vs. Groundwater Elevation Result --*--Groundwater Elevation 10,000 755.00 750.00 2A 745.00 740.00 E CLU 0 735.00 0* 1,000 730.00 2 72.0 O 725.00 " EE o 715.00 710.00 100 .............

705.00 ,,O(,0 c ,,o I',, I r- r, ýO ýO ýO ýO ;M O'n 6') 0' CD O) N 4 0 I4 ýq O C0 0C0 o C 0 CD 0) 00( 0 00 0 0)0 ) C) 0 0.0- V -M.- .. (N 'N (. C- T--CO 0 0 C0 0 CD CD 0 C0 0 0 C) a C 0 C) 0 CD CD C 0 C) 0 C) C0 C C a 0 000~~~%J000 0 0 0 0 0 0 0 0 0 0 0 (N ( (N (N N (N (N N ( (N N ( (N (N N (N (N N ( (N N ( (N (N ( (N (N N (Date 0 a 0 0 ______0 0 0 1~~--~/N 6)0 1,000 2,000 ,V Feet Explanation:

0 Result < 200 pCi/L Figure la 2nd Quarter 2013 RGPP Tritium Sample Locations Overburden Aquifer Exelon Corporation Byron Generating Station a 0 523 DF2 AR-3 0 a a 0 I N 0 1,000 2,000 Feet Explanation:

  • Result 200 to 2,000 pCi/L* Result < 200 pCi/L Figure lb 2nd Quarter 2013 RGPP Tritium Sample Locatjons Upper Galena-Platteville Formation Exelon Corporation Byron Generating Station 0 N 0~i77 2 0 1,000 2,0 00 Feet Explanation:
  • Result 200 to 2,000 pCi/L-AR-11 is the only Lower Galena-Platteville Formation well sampled as part of the RGPP Figure 1c 2nd Quarter 2013 RGPP Tritium Sample Locations Lower Galena-Platteville Formation Exelon Corporation Byron Generating Station a 0 a a 0 a 0 a 0 a 0 6)0 1,000 2,000 Feet Explanation:

0 Increase in Tritium Concentration

  • Decrease in Tritium Concentration 523 -Tritium concentration presented in pico-curies per liter (pCi/L)-295 -Difference in tritium concentration between the 1 st quarter 2013 and 2nd quarter 2013 RGPP sampling rounds.-Only sample locations with detected tritium concentrations greater than 200 pCi/L during the 1st quarter 2013 or 2nd quarter 2013 RGPP sampling rounds are depicted.Figure 2a 2nd Quarter 2013 RGPP Tritium Concentration Change Upper Galena-Platteville Formation Exelon Corporation Byron Generating Station 0 0 0 0 0 2 0 1,000 2,000 Feet Explanation:

U Increase in Tritium Concentration 933 -Tritium concentration presented in pico-curies per liter (pCi/L)+83 -Difference in tritium concentration between the 1st quarter 2013 and 2nd quarter 2013 RGPP sampling rounds.-Only sample locations with detected tritium concentrations greater than 200 pCi/L during the 1st quarter 2013 or 2nd quarter 2013 RGPP sampling rounds are depicted.Figure 2b 2nd Quarter 2013 RGPP Tritium Concentration Change Lower Galena-Platteville Formation Exelon Corporation Byron Generating Station Byron Generating Station Exelon Corporation Appendix A DRA F -Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer TW-13 4/27/2006 157 U Shallow Overburden TW-13 4/27/2006 201 + Shallow Overburden TW-13 11/1/2006 186 U Shallow Overburden TW-13 4/20/2007 152 U Shallow Overburden TW-13 10/8/2007 171 U Shallow Overburden TW-13 5/28/2008 188 U Shallow Overburden TW-13 10/2/2008 164 U Shallow Overburden TW-13 4/29/2009 152 U Shallow Overburden TW-13 10/14/2009 151 U Shallow Overburden TW-13 5/19/2010 153 U Shallow Overburden TW-13 10/21/2010 161 U Shallow Overburden TW-13 5/9/2011 185 U Shallow Overburden TW-13 11/2/2011 181 U Shallow Overburden TW-13 5/16/2012 164 U Shallow Overburden TW-13 10/17/2012 159 U Shallow Overburden TW-13 5/22/2013 175 U Shallow Overburden TW-14 4/27/2006 153 U Shallow Overburden TW-14 11/1/2006 189 U Shallow Overburden TW-14 4/20/2007 154 U Shallow Overburden TW-14 10/8/2007 176 U Shallow Overburden TW-14 5/28/2008 186 U Shallow Overburden TW-14 10/2/2008 168 U Shallow Overburden TW-14 4/29/2009 Not Sampled U Shallow Overburden TW-15 4/27/2006 159 U Shallow Overburden TW-15 11/1/2006 185 U Shallow Overburden TW-15 4/20/2007 156 U Shallow Overburden TW-15 10/8/2007 176 U Shallow Overburden TW-15 5/28/2008 186 U Shallow Overburden TW-15 10/2/2008 164 U Shallow Overburden TW-15 4/29/2009 Not Sampled U Shallow Overburden CAR-1 4/27/2006 154 U Upper Unconsolidated CAR-1 11/1/2006 190 U Upper Unconsolidated CAR-i 4/20/2007 155 U Upper Unconsolidated CAR-1 10/8/2007 174 U Upper Unconsolidated CAR-1 5/28/2008 187 U Upper Unconsolidated CAR-1 10/1/2008 166 U Upper Unconsolidated CAR-1 4/29/2009 152 U Upper Unconsolidated CAR-1 10/14/2009 149 U Upper Unconsolidated CAR-1 5/17/2010 Not Sampled U Upper Unconsolidated CAR-i 10/20/2010 157 U Upper Unconsolidated CAR-1 5/9/2011 191 U Upper Unconsolidated CAR-1 11/2/2011 184 U Upper Unconsolidated CAR-1 5/16/2012 168 U Upper Unconsolidated CAR-1 10/17/2012 159 U Upper Unconsolidated CAR-1 5/22/2013 179 U Upper Unconsolidated AR-1 4/26/2006 165 U Upper Galena-Platteville AR-1 11/1/2006 185 U Upper Galena-Platteville AR-1 4/20/2007 153 U Upper Galena-Platteville AR-1 10/8/2007 180 U Upper Galena-Platteville AR-1 6/2/2008 187 U Upper Galena-Platteville AR-1 9/30/2008 163 U Upper Galena-Platteville AR-1 4/27/2009 157 U Upper Galena-Platteville AR-1 10/15/2009 165 U Upper Galena-Platteville AR-1 5/17/2010 154 U Upper Galena-Platteville AR-i 10/22/2010 159 U Upper Galena-Platteville AR-1 3/7/2011 139 U Upper Galena-Platteville AR-1 5/3/2011 184 U Upper Galena-Platteville AR-i1 7/19/2011 172 U Upper Galena-Platteville AR-1 11/2/2011 181 U Upper Galena-Platteville AR-1 3/6/2012 174 U Upper Galena-Platteville AR-1 5/14/2012 175 U Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (2012013)Page 1 of 6 Byron Generating Station Exelon Corporation Appendix A DRAFT Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-1 8/20/2012 170 U Upper Galena-Platteville AR-1 10/16/2012 173 U Upper Galena-Platteville AR-1 3/18/2013 191 U Upper Galena-Platteville AR-1 5/21/2013 170 U Upper Galena-Platteville AR-1 0 4/26/2006 185 U Upper Galena-Platteville AR-10 11/1/2006 188 U Upper Galena-Platteville AR-10 4/15/2007 156 U Upper Galena-Platteville AR-10 10/8/2007 178 + Upper Galena-Platteville AR-10 6/2/2008 189 U Upper Galena-Platteville AR-10 9/30/2008 160 U Upper Galena-Platteville AR-10 4/27/2009 155 U Upper Galena-Platteville AR-10 10/15/2009 194 U Upper Galena-Platteville AR-10 5/17/2010 157 U Upper Galena-Platteville AR-10 10/22/2010 160 U Upper Galena-Platteville AR-10 3/7/2011 174 U Upper Galena-Platteville AR-10 5/3/2011 184 U Upper Galena-Platteville AR-10 7/19/2011 171 U Upper Galena-Platteville AR-10 11/2/2011 189 U Upper Galena-Platteville AR-10 3/6/2012 173 U Upper Galena-Platteville AR-10 5/14/2012 174 U Upper Galena-Platteville AR-10 8/20/2012 173 U Upper Galena-Platteville AR-10 10/16/2012 172 U Upper Galena-Platteville AR-10 3/18/2013 187 U Upper Galena-Platteville AR-10 5/20/2013 173 U Upper Galena-Platteville AR-2 4/26/2006 432 + Upper Galena-Platteville AR-2 4/26/2006 527 + Upper Galena-Platteville AR-2 11/1/2006 492 + Upper Galena-Platteville AR-2 11/1/2006 413 + Upper Galena-Platteville AR-2 4/18/2007 548 + Upper Galena-Platteville AR-2 10/8/2007 383 + Upper Galena-Platteville AR-2 5/29/2008 186 U Upper Galena-Platteville AR-2 10/1/2008 169 U Upper Galena-Platteville AR-2 4/29/2009 152 U Upper Galena-Platteville AR-2 10/15/2009 152 U Upper Galena-Platteville AR-2 5/19/2010 160 U Upper Galena-Platteville AR-2 10/20/2010 163 U Upper Galena-Platteville AR-2 5/9/2011 183 U Upper Galena-Platteville AR-2 11/2/2011 183 U Upper Galena-Platteville AR-2 5/16/2012 169 U Upper Galena-Platteville AR-2 10/17/2012 157 U Upper Galena-Platteville AR-2 5/22/2013 166 U Upper Galena-Platteville AR-3 3/24/2006 214 + Upper Galena-Platteville AR-3 3/24/2006 160 Upper Galena-Platteville AR-3 3/24/2006 271 + Upper Galena-Platteville AR-3 3/24/2006 198 Upper Galena-Platteville AR-3 3/24/2006 207 + Upper Galena-Platteville AR-3 3/27/2006 459 + Upper Galena-Platteville AR-3 3/27/2006 346 + Upper Galena-Platteville AR-3 3/29/2006 372 + Upper Galena-Platteville AR-3 4/3/2006 489 + Upper Galena-Platteville AR-3 4/10/2006 351 + Upper Galena-Platteville AR-3 4/26/2006 389 + Upper Galena-Platteville AR-3 4/26/2006 234 + Upper Galena-Platteville AR-3 6/22/2006 224 + Upper Galena-Platteville AR-3 7/20/2006 225 + Upper Galena-Platteville AR-3 11/1/2006 253 + Upper Galena-Platteville AR-3 11/1/2006 190 U Upper Galena-Platteville AR-3 4/18/2007 327 + Upper Galena-Platteville AR-3 10/8/2007 965 + Upper Galena-Platteville AR-3 10/8/2007 1,110 + Upper Galena-Platteville AR-3 11/27/2007 1,180 + Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (20 2013)Page 2 of 6 Byron Generating Station Exelon Corporation Appendix A DR FT Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-3 118/2008 757 + Upper Galena-Platteville AR-3 5/29/2008 186 U Upper Galena-Platteville AR-3 10/1/2008 163 U Upper Galena-Platteville AR-3 4/29/2009 155 U Upper Galena-Platteville AR-3 10/14/2009 149 U Upper Galena-Platteville AR-3 5/19/2010 156 U Upper Galena-Platteville AR-3 10/20/2010 162 U Upper Galena-Platteville AR-3 3/7/2011 149 U Upper Galena-Platteville AR-3 5/9/2011 188 U Upper Galena-Platteville AR-3 7/20/2011 170 U Upper Galena-Platteville AR-3 11/2/2011 181 U *Upper Galena-Platteville AR-3 3/7/2012 169 U Upper Galena-Platteville AR-3 5/16/2012 172 U Upper Galena-Platteville AR-3 8/15/2012 193 U Upper Galena-Platteville AR-3 10/17/2012 158 U Upper Galena-Platteville AR-3 3/20/2013 190 U Upper Galena-Platteville AR-3 5/22/2013 173 U Upper Galena-Platteville AR-4 4/27/2006 3,260 + Upper Galena-Platteville AR-4 4/27/2006 4,080 + Upper Galena-Platteville AR-4 11/21/2006 2,980 + Upper Galena-Platteville AR-4 11/21/2006 2,440 + Upper Galena-Platteville AR-4 11/21/2006 2,610 + Upper Galena-Platteville AR-4 11/21/2006 2,880 + Upper Galena-Platteville AR-4 5/1/2007 3,050 + Upper Galena-Platteville AR-4 10/10/2007 2,890 + Upper Galena-Platteville AR-4 5/28/2008 2,150 + Upper Galena-Platteville AR-4 10/1/2008 1,910 + Upper Galena-Platteville AR-4 4/29/2009 1,350 + Upper Galena-Platteville AR-4 10/15/2009 1,360 + Upper Galena-Platteville AR-4 5/19/2010 1,250 + Upper Galena-Platteville AR-4 10/21/2010 1,170 + Upper Galena-Platteville AR-4 3/7/2011 875 + Upper Galena-Platteville AR-4 5/9/2011 818 + Upper Galena-Platteville AR-4 7/20/2011 777 + Upper Galena-Platteville AR-4 11/2/2011 912 + Upper Galena-Platteville AR-4 3/7/2012 861 + Upper Galena-Platteville AR-4 5/16/2012 802 + Upper Galena-Platteville AR-4 8/15/2012 872 + Upper Galena-Platteville AR-4 10/17/2012 830 + Upper Galena-Platteville AR-4 3/20/2013 818 + Upper Galena-Platteville AR-4 5/22/2013 523 + Upper Galena-Platteville AR-5 4/27/2006 151 U Upper Galena-Platteville AR-5 11/21/2006 188 U Upper Galena-Platteville AR-5 4/21/2007 170 U Upper Galena-Platteville AR-5 10/10/2007 178 U Upper Galena-Platteville AR-5 5/28/2008 184 U Upper Galena-Platteville AR-5 10/1/2008 166 U Upper Galena-Platteville AR-5 4/29/2009 NA U Upper Galena-Platteville AR-6 4/27/2006 153 U Upper Galena-Platteville AR-6 11/21/2006 190 U Upper Galena-Platteville AR-6 4/21/2007 169 U Upper Galena-Platteville AR-6 10/10/2007 179 U Upper Galena-Platteville AR-6 5/28/2008 188 U Upper Galena-Platteville AR-6 10/1/2008 171 U Upper Galena-Platteville AR-6 4/29/2009 NA U Upper Galena-Platteville AR-7 4/27/2006 160 U Upper Galena-Platteville AR-7 10/30/2006 187 U Upper Galena-Platteville AR-7 4/15/2007 151 U Upper Galena-Platteville AR-7 10/8/2007 179 U Upper Galena-Platteville AR-7 6/2/2008 228 + Upper Galena-Platteville AR-7 9/30/2008 161 U Upper Galena-Platteville Byron Change Tables (2Q 2013)Page 3 of 6 AMO Environmental Decisions Byron Generating Station Appendix A Exelon Corporation D F T Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-7 4/27/2009 157 U Upper Galena-Platteville AR-7 10/13/2009 170 U Upper Galena-Platteville AR-7 5/17/2010 179 + Upper Galena-Platteville AR-7 10/21/2010 171 U Upper Galena-Platteville AR-7 3/7/2011 166 U Upper Galena-Platteville AR-7 5/3/2011 199 + Upper Galena-Platteville AR-7 7/19/2011 291 + Upper Galena-Platteville AR-7 11/2/2011 318 + Upper Galena-Platteville AR-7 1/6/2012 234 + Upper Galena-Platteville AR-7 3/2/2012 175 U Upper Galena-Platteville AR-7 5/14/2012 200 U Upper Galena-Platteville AR-7 8/20/2012 182 + Upper Galena-Platteville AR-7 10/16/2012 191 + Upper Galena-Platteville AR-7 3/18/2013 245 + Upper Galena-Platteville AR-7 5/20/2013 351 + Upper Galena-Platteville AR-8 4/27/2006 161 U Upper Galena-Platteville AR-8 10/30/2006 192 U Upper Galena-Platteville AR-8 4/15/2007 152 U Upper Galena-Platteville AR-8 10/8/2007 180 U Upper Galena-Platteville AR-8 6/2/2008 185 U Upper Galena-Platteville AR-8 9/30/2008 169 U Upper Galena-Platteville AR-8 4/27/2009 151 U Upper Galena-Platteville AR-8 10/13/2009 163 U Upper Galena-Platteville AR-8 5/17/2010 150 U Upper Galena-Platteville AR-8 10/21/2010 163 U Upper Galena-Platteville AR-8 3/7/2011 155 U Upper Galena-Platteville AR-8 5/3/2011 187 U Upper Galena-Platteville AR-8 7/19/2011 173 U Upper Galena-Platteville AR-8 11/2/2011 185 U Upper Galena-Platteville AR-8 3/6/2012 171 U Upper Galena-Platteville AR-8 5/14/2012 172 U Upper Galena-Platteville AR-8 8/20/2012 173 U Upper Galena-Platteville AR-8 10/16/2012 174 U Upper Galena-Platteville AR-8 3/18/2013 189 U Upper Galena-Platteville AR-8 5/20/2013 178 U Upper Galena-Platteville AR-9 4/27/2006 155 U Upper Galena-Platteville AR-9 10/30/2006 191 U Upper Galena-Platteville AR-9 4/20/2007 155 U Upper Galena-Platteville AR-9 10/8/2007 178 U Upper Galena-Platteville AR-9 6/2/2008 189 U Upper Galena-Platteville AR-9 9/30/2008 164 U Upper Galena-Platteville AR-9 4/27/2009 153 U Upper Galena-Platteville AR-9 10/13/2009 182 U Upper Galena-Platteville AR-9 5/17/2010 150 U Upper Galena-Platteville AR-9 10/22/2010 161 U Upper Galena-Platteville AR-9 3/7/2011 182 U Upper Galena-Platteville AR-9 5/3/2011 184 U Upper Galena-Platteville AR-9 7/19/2011 171 U Upper Galena-Platteville AR-9 11/2/2011 189 U Upper Galena-Platteville AR-9 3/6/2012 172 U Upper Galena-Platteville AR-9 5/14/2012 173 U Upper Galena-Platteville AR-9 8/20/2012 171 U Upper Galena-Platteville AR-9 10/16/2012 171 U Upper Galena-Platteville AR-9 3/18/2013 192 U Upper Galena-Platteville AR-9 5/21/2013 177 U Upper Galena-Platteville CAR-2 4/27/2006 159 U Upper Galena-Platteville CAR-2 11/2/2006 187 U Upper Galena-Platteville CAR-2 4/20/2007 152 U Upper Galena-Platteville CAR-2 10/8/2007 175 U Upper Galena-Platteville CAR-2 5/28/2008 191 U Upper Galena-Platteville CAR-2 10/1/2008 158 U Upper Galena-Platteville Byron Change Tables (2Q 2013)Page 4 of 6 AMO Environmental Decisions Byron Generating Station Appendix A Exelon Corporation D fRAF Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer CAR-2 4/29/2009 NA U Upper Galena-Platteville CAR-3 4/27/2006 150 U Upper Galena-Platteville CAR-3 10/30/2006 198 U Upper Galena-Platteville CAR-3 4/15/2007 157 U Upper Galena-Platteville CAR-3 10/8/2007 178 U Upper Galena-Platteville CAR-3 6/2/2008 185 U Upper Galena-Platteville CAR-3 9/30/2008 167 U Upper Galena-Platteville CAR-3 4/27/2009 153 U Upper Galena-Platteville CAR-3 10/13/2009 191 U Upper Galena-Platteville CAR-3 5/17/2010 158 U Upper Galena-Platteville CAR-3 10/21/2010 160 U Upper Galena-Platteville CAR-3 3/7/2011 151 U Upper Galena-Platteville CAR-3 5/3/2011 184 U Upper Galena-Platteville CAR-3 7/19/2011 170 U Upper Galena-Platteville CAR-3 11/2/2011 166 U Upper Galena-Platteville CAR-3 3/6/2012 171 U Upper Galena-Platteville CAR-3 5/14/2012 174 U Upper Galena-Platteville CAR-3 8/20/2012 172 U Upper Galena-Platteville CAR-3 10/16/2012 175 U Upper Galena-Platteville CAR-3 3/18/2013 188 U Upper Galena-Platteville CAR-3 5/20/2013 171 U Upper Galena-Platteville DF-13 4/26/2006 158 U Upper Galena-Platteville DF-1 9 4/25/2006 187 U Upper Galena-Platteville DF-1 S 4/25/2006 185 U Upper Galena-Platteville DF-24 4/26/2006 162 U Upper Galena-Platteville DF-24 11/21/2006 191 U Upper Galena-Platteville DF-24 4/19/2007 170 U Upper Galena-Platteville DF-24 10/10/2007 179 U Upper Galena-Platteville DF-24 5/28/2008 188 U Upper Galena-Platteville DF-24 10/1/2008 167 U Upper Galena-Platteville DF-24 4/29/2009 154 U Upper Galena-Platteville DF-24 10/14/2009 170 U Upper Galena-Platteville DF-24 5/19/2010 157 U Upper Galena-Platteville DF-24 10/21/2010 157 U Upper Galena-Platteville DF-24 3/7/2011 152 U Upper Galena-Platteville DF-24 5/9/2011 185 U Upper Galena-Platteville DF-24 7/20/2011 170 U Upper Galena-Platteville DF-24 11/2/2011 184 U Upper Galena-Platteville DF-24 3/7/2012 173 U Upper Galena-Platteville DF-24 5/16/2012 167 U Upper Galena-Platteville DF-24 8/15/2012 194 U Upper Galena-Platteville DF-24 10/17/2012 158 U Upper Galena-Platteville DF-24 3/20/2013 187 U Upper Galena-Platteville DF-24 5/22/2013 178 U Upper Galena-Platteville DF-2S 4/25/2006 186 U Upper Galena-Platteville DF-3S 4/25/2006 190 U Upper Galena-Platteville DF-4DS 4/25/2006 191 U Upper Galena-Platteville GW-9 4/28/2006 159 U Upper Galena-Ptatteville GW-9 11/21/2006 190 U Upper Galena-Platteville GW-9 4/21/2007 168 U Upper Galena-Platteville GW-9 10/10/2007 175 U Upper Galena-Platteville GW-9 5/29/2008 181 U Upper Galena-Platteville GW-9 10/2/2008 163 U Upper Galena-Platteville GW-9 4/29/2009 NA U Upper Galena-Platteville MW-1 4/26/2006 189 U Upper Galena-Platteville MW-1 11/1/2006 186 U Upper Galena-Platteville MW-1 4/19/2007 149 U Upper Galena-Platteville MW-1 10/8/2007 176 U Upper Galena-Platteville MW-1 5/29/2008 186 U Upper Galena-Platteville MW-1 10/1/2008 172 U Upper Galena-Platteville MW-1 4/29/2009 NA U Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (2Q 2013)Page 5 of 6 Byron Generating Station Exelon Corporation

%I ~-=~Appendix A., RFT Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer MW-1 5/16/2012 167 U Upper Galena-Platteville MW-1 10/17/2012 160 U Upper Galena-Platteville MW-1 5/22/2013 181 U Upper Galena-Platteville MW-3 4/26/2006 182 U Upper Galena-Platteville MW-3 11/1/2006 186 U Upper Galena-Platteville MW-3 4/19/2007 158 U Upper Galena-Platteville MW-3 10/8/2007 177 U Upper Galena-Platteville MW-3 5/29/2008 186 U Upper Galena-Platteville MW-3 10/1/2008 Dry Upper Galena-Platteville MW-3 5/16/2012 163 U Upper Galena-Platteville MW-3 10/17/2012 157 U Upper Galena-Platteville MW-3 5/22/2013 180 U Upper Galena-Platteville MW-30 4/28/2006 160 U Upper Galena-Platteville PC-1B 4/26/2006 161 U Upper Galena-Platteville PC-2B 4/25/2006 175 U Upper Galena-Platteville PC-5B 4/26/2006 165 U Upper Galena-Platteville PC-6B 4/26/2006 165 U Upper Galena-Platteville WELL-7 4/27/2006 164 U Upper Galena-Platteville WELL-7 4/27/2006 159 U Upper Galena-Platteville WELL-7 10/10/2007 189 U Upper Galena-Platteville WELL-7 5/29/2008 186 U Upper Galena-Platteville WELL-7 10/2/2008 150 U Upper Galena-Platteville WELL-7 4/29/2009 NA U Upper Galena-Platteville AR-11 4/26/2006 2,340 + Lower Galena-Platteville AR-11 11/21/2006 1,780 + Lower Galena-Platteville AR-11 11/21/2006 1,710 + Lower Galena-Platteville AR-11 11/21/2006 2,070 + Lower Galena-Platteville AR-1l 11/21/2006 1,860 + Lower Galena-Platteville AR-1l 4/23/2007 1,820 + Lower Galena-Platteville AR-1l 10/10/2007 1,300 + Lower Galena-Platteville AR-1 1 5/28/2008 1,220 + Lower Galena-Platteville AR-1 1 10/1/2008 1,280 + Lower Galena-Platteville AR-1l 4/29/2009 1,110 + Lower Galena-Platteville AR- 1 10/15/2009 1,010 + Lower Galena-Platteville AR-11 5/20/2010 1,120 + Lower Galena-Platteville AR-11 10/21/2010 947 + Lower Galena-Platteville AR-11 3/7/2011 827 + Lower Galena-Platteville AR-1l 5/9/2011 919 + Lower Galena-Platteville AR-11 7/20/2011 1,150 + Lower Galena-Platteville AR-11 11/2/2011 894 + Lower Galena-Platteville AR-11 3/7/2012 1,100 + Lower Galena-Platteville AR-11 5/16/2012 1,110 + Lower Galena-Platteville AR-11 8/15/2012 1,210 + Lower Galena-Platteville AR-11 10/17/2012 994 + Lower Galena-Platteville AR-11 3/20/2013 850 + Lower Galena-Platteville AR-11 5/22/2013 933 + Lower Galena-Platteville DF-12 4/25/2006 175 U Lower Galena-Platteville DF-iD 4/25/2006 176 U Lower Galena-Platteville DF-6 4/25/2006 176 U Lower Galena-Platteville MW-36 4/25/2006 176 U Lower Galena-Platteville MW-2 4/27/2006 157 U St. Peter Sandstone MW-37 4/26/2006 158 U St. Peter Sandstone MW-39 4/26/2006 158 U St. Peter Sandstone PC-1C 4/26/2006 164 U St. Peter Sandstone All concentrations presented in pico-curles per liter.Explanation:

2,340 -Bold concentrations represent exceedences of the Lower Limit of Detection of 200 pico-curies per liter.U -Tritium not detected above the laboratory detection limit.+ -Tritium detected above the laboratory detection limit.Byron Change Tables (20 2013)Page 6 of 6 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B DRAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer DF-7S 4/24/2006 Not Measured Shallow Overburden TW-13 4/27/2006 683.36 Shallow Overburden TW-13 11/1/2006 683.05 Shallow Overburden TW-13 4/20/2007 Not Measured Shallow Overburden TW-13 10/8/2007 682.84 Shallow Overburden TW-13 5/28/2008 683.86 Shallow Overburden TW-13 9/29/2008 683.57 Shallow Overburden TW-13 4/29/2009 684.26 Shallow Overburden TW-13 10/14/2009 683.38 Shallow Overburden TW-13 5/17/2010 684.22 Shallow Overburden TW-13 10/21/2010 683.27 Shallow Overburden TW-1 3 3/8/2011 683.70 Shallow Overburden TW-13 5/9/2011 682.83 Shallow Overburden TW-13 7/20/2011 683.26 Shallow Overburden TW-13 11/2/2011 682.97 Shallow Overburden TW-13 3/7/2012 683.20 Shallow Overburden TW-13 5/16/2012 683.26 Shallow Overburden TW-13 8/15/2012 682.86 Shallow Overburden TW-13 10/17/2012 682.86 Shallow Overburden TW-13 3/18/2013 683.19 Shallow Overburden TW-13 5/22/2013 683.72 Shallow Overburden TW-14 4/27/2006 672.93 Shallow Overburden TW-14 11/1/2006 672.11 Shallow Overburden TW-14 4/20/2007 Not Measured Shallow Overburden TW-14 10/8/2007 672.41 Shallow Overburden TW-14 5/28/2008 674.46 Shallow Overburden TW-14 9/29/2008 672.71 Shallow Overburden TW-14 4/29/2009 677.15 Shallow Overburden TW-14 10/14/2009 672.39 Shallow Overburden TW-14 5/17/2010 676.96 Shallow Overburden TW-14 10/21/2010 672.05 Shallow Overburden TW-14 3/8/2011 674.55 Shallow Overburden TW-14 5/7/2011 675.10 Shallow Overburden TW-14 7/20/2011 672.00 Shallow Overburden TW-14 11/2/2011 671.66 Shallow Overburden TW-15 4/27/2006 672.89 Shallow Overburden TW-15 11/1/2006 672.01 Shallow Overburden TW-15 4/20/2007 Not Measured Shallow Overburden TW-15. 10/8/2007 672.48 Shallow Overburden TW-15 5/28/2008 674.46 Shallow Overburden TW-15 9/29/2008 672.73 Shallow Overburden TW-15 4/29/2009 677.12 Shallow Overburden TW-15 10/14/2009 672.38 Shallow Overburden TW-15 5/17/2010 676.93 Shallow Overburden TW-15 10/21/2010 672.03 Shallow Overburden TW-15 3/8/2011 674.53 Shallow Overburden TW-15 5/7/2011 675.05 Shallow Overburden TW-15 7/20/2011 671.97 Shallow Overburden TW-15 11/2/2011 671.63 Shallow Overburden DF-7D 4/24/2006 675.08 Middle Unconsolidated CAR-1 3/23/2006 672.22 Upper Unconsolidated CAR-1 4/4/2006 672.20 Upper Unconsolidated CAR-i 4/27/2006 672.63 Upper Unconsolidated CAR-A 11/1/2006 671.92 Upper Unconsolidated CAR-i 4/20/2007 Not Measured Upper Unconsolidated CAR-1 10/8/2007 667.37 Upper Unconsolidated CAR-1 5/28/2008 673.79 Upper Unconsolidated CAR-1 9/29/2008 672.37 Upper Unconsolidated CAR-1 4/29/2009 675.99 Upper Unconsolidated Byron Change Tables (2Q 2013)Page 1 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B DRAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer CAR-1 10/14/2009 672.00 Upper Unconsolidated CAR-i 5/17/2010 675.82 Upper Unconsolidated CAR-1 10/20/2010 671.70 Upper Unconsolidated CAR-1 3/8/2011 674.06 Upper Unconsolidated CAR-1 5/9/2011 674.10 Upper Unconsolidated CAR-i 7/20/2011 671.60 Upper Unconsolidated CAR-I 11/2/2011 671.41 Upper Unconsolidated CAR-1 3/7/2012 672.48 Upper Unconsolidated CAR-i 5/16/2012 672.40 Upper Unconsolidated CAR-1 8/15/2012 670.69 Upper Unconsolidated CAR-1 10/17/2012 670.70 Upper Unconsolidated CAR-1 3/18/2013 674.55 Upper Unconsolidated CAR-1 5/22/2013 673.92 Upper Unconsolidated AR-I 3/23/2006 831.40 Upper Galena-Platteville AR-I 4/4/2006 831.38 Upper Galena-Platteville AR-i 4/26/2006 835.94 Upper Galena-Platteville AR-i 11/1/2006 833.22 Upper Galena-Platteville AR-i 4/20/2007 Not Measured Upper Galena-Platteville AR-i 6/2/2008 837.43 Upper Galena-Platteville AR-i 9/29/2008 838.69 Upper Galena-Platteville AR-i 4/29/2009 837.55 Upper Galena-Platteville AR-i 10/13/2009 836.24 Upper Galena-Platteville AR-1 5/17/2010 834.98 Upper Galena-Platteville AR-I 10/22/2010 832.90 Upper Galena-Platteville AR-i 3/7/2011 832.92 Upper Galena-Platteville AR-i 5/9/2011 835.71 Upper Galena-Platteville AR-i 7/19/2011 834.28 Upper Galena-Platteville AR-i 11/2/2011 834.07 Upper Galena-Platteville AR-I 3/6/2012 830.95 Upper Galena-Platteville AR-i 5/14/2012 832.14 Upper Galena-Platteville AR-i 8/20/2012 829.59 Upper Galena-Platteville AR-1 10/16/2012 828.57 Upper Galena-Platteville AR-I 3/18/2013 831.09 Upper Galena-Platteville AR-i 5/22/2013 835.99 Upper Galena-Platteville AR-10 4/26/2006 837.66 Upper Galena-Platteville AR-10 11/1/2006 837.45 Upper Galena-Platteville AR-10 4/15/2007 Not Measured Upper Galena-Platteville AR-10 6/2/2008 842.97 Upper Galena-Platteville AR-10 9/29/2008 842.13 Upper Galena-Platteville AR-i0 10/1/2008 842.13 Upper Galena-Platteville AR- 0 4/29/2009 843.90 Upper Galena-Platteville AR-10 10/13/2009 842.30 Upper Galena-Platteville AR-10 5/17/2010 843.01 Upper Galena-Platteville AR-10 10/22/2010 841.06 Upper Galena-Platteville AR-10 3/7/2011 839.44 Upper Galena-Platteville AR-10 5/9/2011 841.10 Upper Galena-Platteville AR-10 7/19/2011 840.75 Upper Galena-Platteville AR-10 11/2/2011 839.52 Upper Galena-Platteville AR-i0 3/6/2012 838.61 Upper Galena-Platteville AR-i0 5/14/2012 838.90 Upper Galena-Platteville AR-i0 8/20/2012 837.04 Upper Galena-Platteville AR-10 10/16/2012 836.40 Upper Galena-Platteville AR-10 3/18/2013 835.76 Upper Galena-Platteville AR-10 5/22/2013 840.64 Upper Galena-Platteville AR-2 3/23/2006 798.68 Upper Galena-Platteville AR-2 4/4/2006 798.31 Upper Galena-Platteville AR-2 4/26/2006 798.50 Upper Galena-Platteville AR-2 11/1/2006 797.48 Upper Galena-Platteville AR-2 4/18/2007 Not Measured Upper Galena-Platteville Byron Change Tables (2Q 2013)Page 2 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B D R' A FT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-2 10/8/2007 803.96 Upper Galena-Platteville AR-2 5/29/2008 812.58 Upper Galena-Platteville AR-2 9/29/2008 811.18 Upper Galena-Platteville AR-2 4/29/2009 818.53 Upper Galena-Platteville AR-2 10/13/2009 812.98 Upper Galena-Platteville AR-2 5/17/2010 818.47 Upper Galena-Platteville AR-2 10/20/2010 815.67 Upper Galena-Platteville AR-2 3/7/2011 809.56 Upper Galena-Platteville AR-2 5/9/2011 817.03 Upper Galena-Platteville AR-2 7/20/2011 828.53 Upper Galena-Platteville AR-2 11/2/2011 813.87 Upper Galena-Platteville AR-2 3/7/2012 809.18 Upper Galena-Platteville AR-2 5/16/2012 824.77 Upper Galena-Platteville AR-2 8/15/2012 816.79 Upper Galena-Platteville AR-2 10/17/2012 817.16 Upper Galena-Platteville AR-2 3/18/2013 808.18 Upper Galena-Platteville AR-2 5/22/2013 812.10 Upper Galena-Platteville AR-3 3/23/2006 798.16 Upper Galena-Platteville AR-3 4/4/2006 797.49 Upper Galena-Platteville AR-3 4/26/2006 796.87 Upper Galena-Platteville AR-3 11/1/2006 796.14 Upper Galena-Platteville AR-3 4/18/2007 Not Measured Upper Galena-Platteville AR-3 10/8/2007 802.31 Upper Galena-Platteville AR-3 5/29/2008 804.84 Upper Galena-Platteville AR-3 9/29/2008 803.14 Upper Galena-Platteville AR-3 4/29/2009 806.32 Upper Galena-Platteville AR-3 10/14/2009 804.10 Upper Galena-Platteville AR-3 5/17/2010 805.29 Upper Galena-Platteville AR-3 10/20/2010 804.62 Upper Galena-Platteville AR-3 3/7/2011 807.64 Upper Galena-Platteville AR-3 5/9/2011 804.49 Upper Galena-Platteville AR-3 7/20/2011 805.32 Upper Galena-Platteville AR-3 11/2/2011 803.72 Upper Galena-Platteville AR-3 3/7/2012 803.41 Upper Galena-Platteville AR-3 5/16/2012 803.73 Upper Galena-Platteville AR-3 8/15/2012 803.14 Upper Galena-Platteville AR-3 10/17/2012 802.79 Upper Galena-Platteville AR-3 3/18/2013 802.38 Upper Galena-Platteville AR-3 5/22/2013 804.10 Upper Galena-Platteville AR-4 4/27/2006 742.74 Upper Galena-Platteville AR-4 11/21/2006 740.67 Upper Galena-Platteville AR-4 4/23/2007 Not Measured Upper Galena-Platteville AR-4 10/10/2007 744.24 Upper Galena-Platteville AR-4 5/28/2008 748.14 Upper Galena-Platteville AR-4 9/29/2008 744.64 Upper Galena-Platteville AR-4 4/29/2009 753.48 Upper Galena-Platteville AR-4 10/15/2009 745.02 Upper Galena-Platteville AR-4 5/17/2010 751.73 Upper Galena-Platteville AR-4 10/21/2010 743.84 Upper Galena-Platteville AR-4 3/7/2011 743.54 Upper Galena-Platteville AR-4 5/9/2011 749.44 Upper Galena-Platteville AR-4 7/20/2011 745.27 Upper Galena-Platteville AR-4 11/2/2011 743.37 Upper Galena-Platteville AR-4 3/7/2012 743.47 Upper Galena-Platteville AR-4 5/16/2012 744.84 Upper Galena-Platteville AR-4 8/15/2012 741.62 Upper Galena-Platteville AR-4 10/17/2012 740.53 Upper Galena-Platteville AR-4 3/18/2013 740.94 Upper Galena-Platteville AR-4 5/22/2013 746.57 Upper Galena-Platteville Byron Change Tables (2Q 2013)Page 3 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B aJ PA#ýFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-5 3/23/2006 687.90 Upper Galena-Platteville AR-5 4/4/2006 689.06 Upper Galena-Platteville AR-5 4/27/2006 688.08 Upper Galena-Platteville AR-5 11/21/2006 687.75 Upper Galena-Platteville AR-5 4/21/2007 Not Measured Upper Galena-Platteville AR-5 10/10/2007 687.42 Upper Galena-Platteville AR-5 5/28/2008 689.00 Upper Galena-Platteville AR-5 9/29/2008 688.20 Upper Galena-Platteville AR-5 4/28/2009 690.95 Upper Galena-Platteville AR-5 10/14/2009 688.48 Upper Galena-Platteville AR-5 5/17/2010 690.67 Upper Galena-Platteville AR-5 10/20/2010 688.29 Upper Galena-Platteville AR-5 3/7/2011 689.40 Upper Galena-Platteville AR-5 5/7/2011 690.12 Upper Galena-Platteville AR-5 7/20/2011 688.35 Upper Galena-Platteville AR-5 11/2/2011 687.94 Upper Galena-Platteville AR-6 3/23/2006 674.47 Upper Galena-Platteville AR-6 4/4/2006 674.68 Upper Galena-Platteville AR-6 4/27/2006 675.00 Upper Galena-Platteville AR-6 11/21/2006 674.75 Upper Galena-Platteville AR-6 4/21/2007 Not Measured Upper Galena-Platteville AR-6 10/10/2007 675.22 Upper Galena-Platteville AR-6 5/28/2008 676.65 Upper Galena-Platteville AR-6 9/29/2008 675.70 Upper Galena-Platteville AR-6 4/28/2009 678.55 Upper Galena-Platteville AR-6 10/14/2009 675.45 Upper Galena-Platteville AR-6 5/17/2010 679.35 Upper Galena-Platteville AR-6 10/20/2010 675.29 Upper Galena-Platteville AR-6 3/7/2011 676.60 Upper Galena-Platteville AR-6 5/7/2011 677.34 Upper Galena-Platteville AR-6 7/20/2011 675.26 Upper Galena-Platteville AR-6 11/2/2011 674.87 Upper Galena-Platteville AR-7 4/4/2006 765.96 Upper Galena-Platteville AR-7 4/27/2006 766.74 Upper Galena-Platteville AR-7 10/30/2006 768.42 Upper Galena-Platteville AR-7 4/15/2007 Not Measured Upper Galena-Platteville AR-7 6/2/2008 787.88 Upper Galena-Platteville AR-7 9/29/2008 786.38 Upper Galena-Platteville AR-7 10/1/2008 786.38 Upper Galena-Platteville AR-7 4/29/2009 793.61 Upper Galena-Platteville AR-7 10/13/2009 790.87 Upper Galena-Platteville AR-7 5/17/2010 791.71 Upper Galena-Platteville AR-7 10/21/2010 790.58 Upper Galena-Platteville AR-7 3/7/2011 781.11 Upper Galena-Platteville AR-7 5/9/2011 784.63 Upper Galena-Platteville AR-7 7/19/2011 787.14 Upper Galena-Platteville AR-7 11/2/2011 788.26 Upper Galena-Platteville AR-7 3/2/2012 781.82 Upper Galena-Platteville AR-7 5/14/2012 782.14 Upper Galena-Platteville AR-7 8/20/2012 778.32 Upper Galena-Platteville AR-7 10/16/2012 776.00 Upper Galena-Platteville AR-7 3/18/2013 775.88 Upper Galena-Platteville AR-7 5/22/2013 785.43 Upper Galena-Platteville AR-8 4/4/2006 816.14 Upper Galena-Platteville AR-8 4/27/2006 838.55 Upper Galena-Platteville AR-8 10/30/2006 836.86 Upper Galena-Platteville AR-8 4/15/2007 Not Measured Upper Galena-Platteville AR-8 6/2/2008 848.56 Upper Galena-Platteville AR-8 9/29/2008 851.66 Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (20 2013)Page 4 of 10 Byron Generating Station Exelon Corporation I--1 ,Appendix B D. FR T Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-8 4/29/2009 Not Measured Upper Galena-Platteville AR-8 10/13/2009 851.76 Upper Galena-Platteville AR-8 5/17/2010 847.98 Upper Galena-Platteville AR-8 10/21/2010 847.71 Upper Galena-Platteville AR-8 3/7/2011 840.64 Upper Galena-Platteville AR-8 5/9/2011 842.76 Upper Galena-Platteville AR-8 7/19/2011 844.45 Upper Galena-Platteville AR-8 11/2/2011 845.01 Upper Galena-Platteville AR-8 3/6/2012 839.10 Upper Galena-Platteville AR-8 5/14/2012 839.24 Upper Galena-Platteville AR-8 8/20/2012 835.79 Upper Galena-Platteville AR-8 10/16/2012 833.30 Upper Galena-Platteville AR-8 3/18/2013 835.11 Upper Galena-Platteville AR-8 5/22/2013 843.20 Upper Galena-Platteville AR-9 4/27/2006 850.40 Upper Galena-Platteville AR-9 10/30/2006 819.21 Upper Galena-Platteville AR-9 4/20/2007 Not Measured Upper Galena-Platteville AR-9 6/2/2008 830.88 Upper Galena-Platteville AR-9 9/29/2008 831.12 Upper Galena-Platteville AR-9 10/1/2008 831.12 Upper Galena-Platteville AR-9 4/29/2009 832.26 Upper Galena-Platteville AR-9 10/13/2009 833.11 Upper Galena-Platteville AR-9 5/17/2010 832.42 Upper Galena-Platteville AR-9 10/22/2010 832.63 Upper Galena-Platteville AR-9 3/7/2011 827.92 Upper Galena-Platteville AR-9 5/9/2011 830.39 Upper Galena-Platteville AR-9 7/19/2011 832.94 Upper Galena-Platteville AR-9 11/2/2011 829.95 Upper Galena-Platteville AR-9 3/6/2012 828.75 Upper Galena-Platteville AR-9 5/14/2012 828.95 Upper Galena-Platteville AR-9 8/20/2012 826.91 Upper Galena-Platteville AR-9 10/16/2012 825.42 Upper Galena-Platteville AR-9 3/18/2013 837.15 Upper Galena-Platteville AR-9 5/22/2013 833.55 Upper Galena-Platteville CAR-2 3/23/2006 736.50 Upper Galena-Platteville CAR-2 4/4/2006 742.56 Upper Galena-Platteville CAR-2 4/27/2006 736.89 Upper Galena-Platteville CAR-2 11/2/2006 736.69 Upper Galena-Platteville CAR-2 4/20/2007 Not Measured Upper Galena-Platteville CAR-2 10/8/2007 735.43 Upper Galena-Platteville CAR-2 5/28/2008 736.81 Upper Galena-Platteville CAR-2 9/29/2008 736.61 Upper Galena-Platteville CAR-2 4/28/2009 743.39 Upper Galena-Platteville CAR-2 10/14/2009 737.05 Upper Galena-Platteville CAR-2 5/17/2010 742.61 Upper Galena-Platteville CAR-2 10/21/2010 734.90 Upper Galena-Platteville CAR-2 3/7/2011 742.66 Upper Galena-Platteville CAR-2 5/7/2011 740.87 Upper Galena-Platteville CAR-2 7/20/2011 735.51 Upper Galena-Platteville CAR-2 11/2/2011 735.17 Upper Galena-Platteville CAR-3 4/4/2006 824.62 Upper Galena-Platteville CAR-3 4/27/2006 826.52 Upper Galena-Platteville CAR-3 10/30/2006 828.33 Upper Galena-Platteville CAR-3 4/15/2007 Not Measured Upper Galena-Platteville CAR-3 6/2/2008 838.21 Upper Galena-Platteville CAR-3 9/29/2008 840.95 Upper Galena-Platteville CAR-3 10/1/2008 840.95 Upper Galena-Platteville CAR-3 4/29/2009 841.96 Upper Galena-Platteville CAR-3 10/13/2009 845.69 Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (2Q 2013)Page 5 of 10 Byron Generating Station Exelon Corporation Appendix B DRAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer CAR-3 5/17/2010 837.87 Upper Galena-Platteville CAR-3 10/21/2010 837.36 Upper Galena-Platteville CAR-3 3/7/2011 834.92 Upper Galena-Platteville CAR-3 5/9/2011 844.36 Upper Galena-Platteville CAR-3 7/19/2011 834.20 Upper Galena-Platteville CAR-3 11/2/2011 835.29 Upper Galena-Platteville CAR-3 3/6/2012 833.94 Upper Galena-Platteville CAR-3 5/14/2012 833.11 Upper Galena-Platteville CAR-3 8/20/2012 828.57 Upper Galena-Platteville CAR-3 10/16/2012 831.07 Upper Galena-Platteville CAR-3 3/18/2013 850.75 Upper Galena-Platteville CAR-3 5/22/2013 842.24 Upper Galena-Platteville OF-10 4/24/2006 Not Measured Upper Galena-Platteville DF-i1 4/24/2006 749.00 Upper Galena-Platteville DF-15 3/23/2006 745.49 Upper Galena-Platteville 6F-15 4/4/2006 740.47 Upper Galena-Platteville DF-15 4/24/2006 740.98 Upper Galena-Platteville DF-1 8 3/23/2006 724.68 Upper Galena-Platteville DF-18 4/4/2006 724.80 Upper Galena-Platteville DF-1 8 4/24/2006 725.72 Upper Galena-Platteville DF-19 3/23/2006 724.51 Upper Galena-Platteville DF-1 9 4/4/2006 724.63 Upper Galena-Platteville DF-19 4/25/2006 725.60 Upper Galena-Platteville DF-iS 3/23/2006 724.97 Upper Galena-Platteville DF-IS 4/4/2006 725.09 Upper Galena-Platteville OF-IS 4/25/2006 726.04 Upper Galena-Platteville DF-22S 3/23/2006 735.86 Upper Galena-Platteville DF-22S 4/4/2006 725.99 Upper Galena-Platteville DF-22S 4/24/2006 726.34 Upper Galena-Platteville DF-24 3/23/2006 722.40 Upper Galena-Platteville DF-24 4/4/2006 722.57 Upper Galena-Platteville DF-24 4/26/2006 723.79 Upper Galena-Platteville DF-24 11/21/2006 721.58 Upper Galena-Platteville DF-24 4/19/2007 Not Measured Upper Galena-Platteville DF-24 10/10/2007 724.51 Upper Galena-Platteville DF-24 5/28/2008 732.78 Upper Galena-Platteville DF-24 9/29/2008 726.33 Upper Galena-Platteville DF-24 4/29/2009 739.28 Upper Galena-Platteville DF-24 10/14/2009 728.22 Upper Galena-Platteville DF-24 5/17/2010 733.98 Upper Galena-Platteville DF-24 10/21/2010 728.28 Upper Galena-Platteville DF-24 3/7/2011 726.35 Upper Galena-Platteville DF-24 5/9/2011 730.36 Upper Galena-Platteville DF-24 7/20/2011 726.98 Upper Galena-Platteville DF-24 11/2/2011 724.86 Upper Galena-Platteville DF-24 3/7/2012 724.71 Upper Galena-Platteville DF-24 5/16/2012 724.95 Upper Galena-Platteville DF-24 8/15/2012 724.42 Upper Galena-Platteville DF-24 10/17/2012 722.54 Upper Galena-Platteville DF-24 3/18/2013 725.17 Upper Galena-Platteville DF-24 5/22/2013 729.26 Upper Galena-Platteville DF-2S 3/23/2006 725.48 Upper Galena-Platteville DF-2S 4/4/2006 725.96 Upper Galena-Platteville DF-2S 4/25/2006 727.08 Upper Galena-Platteville DF-3S 3/23/2006 726.28 Upper Galena-Platteville DF-3S 4/4/2006 726.36 Upper Galena-Platteville DF-3S 4/25/2006 727.33 Upper Galena-Platteville DF-4DS 4/25/2006 765.82 Upper Galena-Platteville DF-5S 4/24/2006 799.77 Upper Galena-Platteville Byron Change Tables (2Q 2013)Page 6 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation DRAFT Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer GW-9 4/28/2006 745.46 Upper Galena-Platteville GW-9 11/21/2006 749.73 Upper Galena-Platteville GW-9 4/21/2007 Not Measured Upper Galena-Platteville GW-9 10/10/2007 752.23 Upper Galena-Platteville GW-9 5/29/2008 761.88 Upper Galena-Platteville GW-9 5/29/2008 761.88 Upper Galena-Platteville GW-9 9/29/2008 748.23 Upper Galena-Platteville GW-9 4/28/2009 758.93 Upper Galena-Platteville GW-9 10/14/2009 760.63 Upper Galena-Platteville GW-9 5/17/2010 760.33 Upper Galena-Platteville GW-9 10/21/2010 743.58 Upper Galena-Platteville GW-9 3/9/2011 754.81 Upper Galena-Platteville GW-9 5/10/2011 755.97 Upper Galena-Platteville GW-9 7/20/2011 753.17 Upper Galena-Platteville GW-9 11/2/2011 754.86 Upper Galena-Platteville MW-I 3/23/2006 799.95 Upper Galena-Platteville MW-i 4/4/2006 800.76 Upper Galena-Platteville MW-i 4/26/2006 799.63 Upper Galena-Platteville MW-i 11/1/2006 798.62 Upper Galena-Platteville MW-i 4/19/2007 Not Measured Upper Galena-Platteville MW-i 10/8/2007 804.27 Upper Galena-Platteville MW-i 5/29/2008 812.12 Upper Galena-Platteville MW-i 9/29/2008 808.42 Upper Galena-Platteville MW-i 4/28/2009 819.37 Upper Galena-Platteville MW-i 10/14/2009 812.05 Upper Galena-Platteville MW-i 5/17/2010 Not Measured Upper Galena-Platteville MW-i 10/21/2010 814.17 Upper Galena-Platteville MW-i 3/7/2011 807.40 Upper Galena-Platteville MW-i 5/7/2011 808.37 Upper Galena-Platteville MW-I 7/20/2011 Not Accessible Upper Galena-Platteville MW-I 11/2/2011 Not Measured Upper Galena-Platteville MW-i 3/7/2012 806.45 Upper Galena-Platteville MW-i 5/16/2012 806.57 Upper Galena-Platteville MW-i 8/15/2012 807.70 Upper Galena-Platteville MW-i 10/17/2012 807.66 Upper Galena-Platteville MW-i 3/18/2013 803.34 Upper Galena-Platteville MW-i 5/22/2013 805.50 Upper Galena-Platteville MW-15 3/23/2006 743.98 Upper Galena-Platteville MW-15 4/4/2006 744.21 Upper Galena-Platteville MW-15 4/24/2006 745.56 Upper Galena-Platteville MW-3 4/26/2006 787.51 Upper Galena-Platteville MW-3 11/1/2006 786.00 Upper Galena-Platteville MW-3 4/19/2007 Not Measured Upper Galena-Platteville MW-3 10/8/2007 789.27 Upper Galena-Platteville MW-3 5/29/2008 790.45 Upper Galena-Platteville MW-3 9/29/2008 Dry Upper Galena-Platteville MW-3 4/28/2009 791.15 Upper Galena-Platteville MW-3 10/14/2009 798.65 Upper Galena-Platteville MW-3 5/17/2010 Not Measured Upper Galena-Platteville MW-3 10/21/2010 789.74 Upper Galena-Platteville MW-3 3/7/2011 788.99 Upper Galena-Platteville MW-3 5/7/2011 790.19 Upper Galena-Platteville MW-3 7/20/2011 790.08 Upper Galena-Platteville MW-3 11/2/2011 789.15 Upper Galena-Platteville MW-3 3/7/2012 788.48 Upper Galena-Platteville MW-3 5/16/2012 788.51 Upper Galena-Platteville MW-3 8/15/2012 788.74 Upper Galena-Platteville MW-3 10/17/2012 788.55 Upper Galena-Platteville MW-3 3/18/2013 786.48 Upper Galena-Platteville Byron Change Tables (2Q 2013)Page 7 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B"RA'FT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer MW-3 5/22/2013 786.74 Upper Galena-Platteville MW-30 3/23/2006 720.41 Upper Galena-Platteville MW-30 4/28/2006 720.26 Upper Galena-Platteville PC-1 B 3/23/2006 717.21 Upper Galena-Platteville PC-lB 4/4/2006 717.25 Upper Galena-Platteville PC-lB 4/26/2006 718.01 Upper Galena-Platteville PC-2B 4/4/2006 756.28 Upper Galena-Platteville PC-2B 4/25/2006 756.23 Upper Galena-Platteville PC-3B 4/24/2006 760.58 Upper Galena-Platteville PC-4B 3/23/2006 726.15 Upper Galena-Platteville PC-4B 4/4/2006 726.27 Upper Galena-Platteville PC-4B 4/24/2006 726.49 Upper Galena-Platteville PC-5B 3/23/2006 722.91 Upper Galena-Platteville PC-5B 4/4/2006 722.47 Upper Galena-Platteville PC-5B 4/26/2006 723.60 Upper Galena-Platteville PC-6B 3/23/2006 749.82 Upper Galena-Platteville PC-6B 4/4/2006 740.58 Upper Galena-Platteville PC-6B 4/26/2006 743.18 Upper Galena-Platteville WELL-7 4/27/2006 775.47 Upper Galena-Platteville WELL-7 11/21/2006 784.24 Upper Galena-Platteville WELL-7 10/10/2007 789.24 Upper Galena-Platteville WELL-7 5/29/2008 803.94 Upper Galena-Platteville WELL-7 9/29/2008 784.74 Upper Galena-Platteville WELL-7 4/28/2009 805.04 Upper Galena-Platteville WELL-7 10/14/2009 809.92 Upper Galena-Platteville WELL-7 5/17/2010 808.64 Upper Galena-Platteville WELL-7 10/21/2010 803.79 Upper Galena-Platteville WELL-7 3/7/2011 810.34 Upper Galena-Platteville WELL-7 5/7/2011 810.09 Upper Galena-Platteville WELL-7 7/20/2011 805.48 Upper Galena-Platteville WELL-7 11/2/2011 801.82 Upper Galena-Platteville WELL-7 3/7/2012 793.58 Upper Galena-Platteville WELL-7 5/16/2012 801.59 Upper Galena-Platteville WELL-7 8/15/2012 790.65 Upper Galena-Platteville WELL-7 10/17/2012 808.52 Upper Galena-Platteville WELL-7 3/18/2013 809.81 Upper Galena-Platteville WELL-7 5/22/2013 794.95 Upper Galena-Platteville AR-11 4/26/2006 742.41 Lower Galena-Platteville AR-1 1 11/21/2006 732.75 Lower Galena-Platteville AR-i1 4/23/2007 Not Measured Lower Galena-Platteville AR-11 10/10/2007 721.23 Lower Galena-Platteville AR-11 5/28/2008 744.80 Lower Galena-Platteville AR-1l 9/29/2008 741.70 Lower Galena-Platteville AR-1l 4/29/2009 748.59 Lower Galena-Platteville AR-1l 10/15/2009 742.47 Lower Galena-Platteville AR-1l 5/17/2010 747.35 Lower Galena-Platteville AR-11 10/21/2010 743.30 Lower Galena-Platteville AR-1l 3/7/2011 742.80 Lower Galena-Platteville AR-1l 5/9/2011 747.64 Lower Galena-Platteville AR-1l 7/20/2011 744.43 Lower Galena-Platteville AR-1l 11/2/2011 744.78 Lower Galena-Platteville AR-1l 3/7/2012 744.88 Lower Galena-Platteville AR-1l 5/16/2012 745.74 Lower Galena-Platteville AR-1i 8/15/2012 743.05 Lower Galena-Platteville AR-1l 10/17/2012 742.03 Lower Galena-Platteville AR-1l 3/18/2013 742.34 Lower Galena-Platteville AR-1l 5/22/2013 747.47 Lower Galena-Platteville DF-12 3/23/2006 744.35 Lower Galena-Platteville DF-12 4/25/2006 746.06 Lower Galena-Platteville Byron Change Tables (20 2013)Page 8 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B I NAFT Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer NF-13 3/2312006 744.39 Lower Galena-Platteville DF-13 4/4/2006 744.68 Lower Galena-Platteville DF-13 4/26/2006 746.06 Lower Galena-Platteville DF-17 3/23/2006 729.14 Lower Galena-Platteville DF-17 4/4/2006 729.27 Lower Galena-Platteville DF-17 4/24/2006 729.76 Lower Galena-Platteville DF-iD 3/23/2006 724.56 Lower Galena-Platteville DF-iD 4/4/2006 724.73 Lower Galena-Platteville DF-iD 4/25/2006 725.67 Lower Galena-Platteville DF-22D 3/23/2006 725.78 Lower Galena-Platteville DF-22D 4/24/2006 726.34 Lower Galena-Platteville DF-23 3/23/2006 726.66 Lower Galena-Platteville DF-23 4/4/2006 695.37 Lower Galena-Platteville DF-23 4/24/2006 717.17 Lower Galena-Platteville DF-4DD 3/23/2006 744.49 Lower Galena-Platteville DF-4DD 4/4/2006 744.78 Lower Galena-Platteville DF-4DD 4/24/2006 746.17 Lower Galena-Platteville DF-6 3/23/2006 737.18 Lower Galena-Platteville DF-6 4/4/2006 738.17 Lower Galena-Platteville DF-6 4/25/2006 739.20 Lower Galena-Platteville DF-8 3/23/2006 716.90 Lower Galena-Platteville DF-8 4/4/2006 717.00 Lower Galena-Platteville DF-8 4/24/2006 717.60 Lower Galena-Platteville MW-16 3/23/2006 743.93 Lower Galena-Platteville MW-16 4/4/2006 744.19 Lower Galena-Platteville MW-16 4/24/2006 745.56 Lower Galena-Platteville MW-36 3/23/2006 744.47 Lower Galena-Platteville MW-36 4/4/2006 744.73 Lower Galena-Platteville MW-36 4/25/2006 746.14 Lower Galena-Platteville MW-41 3/23/2006 743.85 Lower Galena-Platteville MW-41 4/4/2006 744.13 Lower Galena-Platteville MW-41 4/24/2006 745.49 Lower Galena-Platteville MW-42 3/23/2006 744.14 Lower Galena-Platteville MW-42 4/4/2006 744.47 Lower Galena-Platteville MW-42 4/24/2006 745.85 Lower Galena-Platteville MW-2 3/23/2006 683.62 St. Peter Sandstone MW-2 4/4/2006 684.18 St. Peter Sandstone MW-2 4/27/2006 684.22 St. Peter Sandstone MW-20R 3/23/2006 680.65 St. Peter Sandstone MW-20R 4/4/2006 680.73 St. Peter Sandstone MW-20R 4/24/2006 681.19 St. Peter Sandstone MW-21 3/23/2006 680.58 St. Peter Sandstone MW-21 4/4/2006 680.70 St. Peter Sandstone MW-21 4/24/2006 681.16 St. Peter Sandstone MW-37 3/23/2006 681.61 St. Peter Sandstone MW-37 4/4/2006 681.73 St. Peter Sandstone MW-37 4/26/2006 682.15 St. Peter Sandstone MW-39 3/23/2006 680.94 St. Peter Sandstone MW-39 4/4/2006 681.06 St. Peter Sandstone MW-39 4/26/2006 681.49 St. Peter Sandstone PC-iC 3/23/2006 678.99 St. Peter Sandstone PC-1C 4/4/2006 678.99 St. Peter Sandstone PC-1C 4/26/2006 679.53 St. Peter Sandstone DF-25 4/24/2006 769.11 Unknown DF-9S 3/23/2006 685.80 Unknown DF-9S 4/4/2006 686.08 Unknown MS-1 3/23/2006 694.03 Unknown MS-1 4/4/2006 693.34 Unknown IMS-2 3/23/2006 676.91 Unknown Bymn Change Tables (2Q 2013)Page 9 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation i~ m\-x'% 7 Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer MS-2 4/4/2006 676.78 Unknown MW-11 4/4/2006 713.67 Unknown MW-121 3/23/2006 704.92 Unknown MW-121 4/4/2006 704.90 Unknown MW12S 3/23/2006 704.45 Unknown MW12S 4/4/2006 706.29 Unknown OS-NW-1D 3/23/2006 676.20 Unknown OS-NW-1D 4/4/2006 743.12 Unknown OS-NW-IS 3/23/2006 742.60 Unknown OS-NW-1S 4/4/2006 774.16 Unknown OS-SW-1 3/23/2006 669.94 Unknown OS-SW-1 4/4/2006 678.43 Unknown OS-SW-2D 3/23/2006 679.76 Unknown OS-SW-2D 4/4/2006 679.89 Unknown OS-SW-21 3/23/2006 679.88 Unknown OS-SW-21 4/4/2006 680.00 Unknown OS-SW-2S 3/23/2006 684.51 Unknown OS-SW-2S 4/4/2006 685.06 Unknown OS-SW-3D 3/23/2006 682.52 Unknown OS-SW-3D 4/4/2006 659.12 Unknown OS-SW-3S 3/23/2006 695.82 Unknown OS-SW-3S 4/4/2006 673.83 Unknown RR-1 0 4/4/2006 672.17 Unknown RR-9 3/23/2006 670.92 Unknown RR-9 4/4/2006 671.05 Unknown All Elevations Presented In Feet Above Mean Sea Level AMO Environmental Decisions Byron Change Tables (20 2013)Page 10 of 10 AMO Environmental Decisions PO Box 410 4327 Point Pleasant Pike Danboro, PA 18916 215-230-8282 (Phone)215-230-8283 (Fax)www.amoed.com Environmental Decisions Geologists Hydrogeologists GIS Analysts Environmental Scientists Earth & Environmental Resource Management Consultants September 10, 2013 Byron Generating Station Chemistry Manager/RGPP Coordinator 4450 North German Church Road Byron, Illinois

Subject:

August 2013 RGPP Summary Monitoring Report (3 rd Quarter 2013)AMO has interpreted the analytical data and field data for the August 2013 Radiological Groundwater Protection Program (RGPP) sampling round, which was completed by EIML (a third party vendor under contract with Exelon Corporation) between August 12, 2013 and August 14, 2013. Exelon's RGPP (EN-AA-408-4000 and EN-BY-408-4160) incorporates guidance as detailed in NEI 07-07, ANI 07-0 1, and EPRI 1015118. All laboratory and field data from this sampling round has been uploaded to the Exelon RGPP Database maintained by Locus Technologies.

The attached tables, graphs, and figures summarize the findings of the August 2013 sampling round.Overall, tritium concentrations have been decreasing at the Station since the 2006. Based on our review of the August 2013 sampling round and available historic data, there does not appear to be ongoing tritium leak at the site.The Station conformed with its RGPP during the 3 rd quarter 2013 with respect to sampling protocol.Please call me at 215-230-8282 if you have questions.

Respectfully, AMO Environmental Decisions Ralph T. Golia, P.G.Principal Hydrogeologist attachments File AMO Environmental Decisions 1 Byron 201308 (August) RGPP Report Cover Letter Byron Generating Station Exelon Corporation Table I Radiological Groundwater Protection Plan Evaluation Checklist Station: Monitoring Round: Byron Generating Station Completed Auaqust 12 throuaqh August 14, 2013 Compliance Evaluation Evaluation Checklist Yes or No Explanation P.I.1 -Was depth to water collected at all monitoring locations?

YES 1 2 -Were all required field data measurements collected?

YES 1 3 -Were all required sampling points sampled? YES See the attached Figures 1 a and 1 b for sample 1 locations.

4- Were all required analyses performed?

YES 1 5- Should there be changes to sampling frequency based on NO NA analytical data?6 -Should there be a well designation change based on analytical NO NA data?Total P.I. Score for the Quarter Data Evaluation Data Evaluation Yes or No Explanation 1 -Are there tritium concentrations

>2,000 pCi/L, but <20,000 NO pCi/L?2 -Are there tritium concentrations

>20,000 pCi/L, but <100,000 NO pCi/L?3 -Are there tritium concentrations

>100,000 pCi/L? NO 4 -Are there increasing tritium concentration trends? NO 5 -Are there decreasing tritium concentration trends? YES The attached graphs for AR-4 and AR-1 1 show an overall decreasing tritium concentration trend since 2006.6 -Are non-tritium analytes detected greater than MDL? NA 7 -Are there increasing non-tritium concentration trends? NA 8 -Are there decreasing non-tritium concentration trends? NA 9 -Are there increasing groundwater elevation trends? NO 10 -Are there decreasing groundwater elevation trends? NO 11 -Are the significant changes to groundwater flow directions?

NO Notes: 1. P.I. -RGPP Performance Indicator.

A score of 0 indicates that the RGPP guidance was not followed.

A score of 1 indicates the RGPP guidance was followed.1 AMO Environmental Decisions Last updated: 9/9/2013 Byron 2012_08 (August) Conformance Table Byron Generating Station Exelon Corporation Table 2 -2nd Quarter 2013 and 3rd Quarter 2013 Groundwater Tritium Concentrations and Change in Tritium Concentrations Change in Change in Sample ID Sample Round Result (pC/L) Qual Sample Round Result (pC/L) Qual Concentration Concentration Aquifer (pC/L) (%)AR-7 2nd Qtr. 2013 351 + 3rd Qtr. 2013 306 + 14 Upper Galena-Platteville AR-1 2nd Qtr. 2013 170 U 3rd Qtr. 2013 188 U 0 0 Upper Galena-Platteville AR-10 2nd Qtr. 2013 173 U 3rd Qtr. 2013 190 U 0 0 Upper Galena-Platteville AR-3 2nd Qtr. 2013 173 U 3rd Qtr. 2013 188 U 0 0 Upper Galena-Platteville AR-8 2nd Qtr. 2013 178 U 3rd Qtr. 2013 190 U 0 0 Upper Galena-Platteville AR-9 2nd Qtr. 2013 177 U 3rd Qtr. 2013 187 U 0 0 Upper Galena-Platteville CAR-3 2nd Qtr. 2013 171 U 3rd Qtr. 2013 185 U 0 0 Upper Galena-Platteville DF-24 2nd Qtr. 2013 178 U 3rd Qtr. 2013 190 U 0 0 Upper Galena-Platteville AR-4 2nd Qtr. 2013 523 + 3rd Qtr. 2013 746 + 223 35 Upper Galena-Platteville AR-11 2nd Qtr. 2013 933 + 3rd Qtr. 2013 945 + 12 1 Lower Galena-Platteville Notes: 1 ) Change in concentration (pC/I) represents the difference in concentrations between the 2n'd quarter 2013 and the 3rd quarter 2013 monitoring rounds unless otherwise noted. Positive numbers represent an increase in concentration; negative numbers represent a decrease in concentration.

2) All detections and detection limits less than 200 pico-curies per liter are considered equal to 200 pico-curies per liter for the purposes of this report.3) Change in concentration

(%) is equal to the change in concentration between the two sampling rounds divided by the average of the analytical results for the two sampling rounds.4) Data reported in the tables and figures does not include the results of re-analyses completed by the laboratory.

Only the highest analyte concentration per sample location is presented.

Byron Change Tables (3Q 2013)Page 1 of 1 AMO Environmental Decisions Byron Generating Station Exelon Corporation Table 3 -3rd Quarter 2012 and 3rd Quarter 2013 Groundwater Elevations and Groundwater Elevation Changes 3rd Quarter 3rd Quarter Monitoring 2012 2013 Change in Moitrng 202203 Groundwater Aquifer Well ID Groundwater Groundwater Grondwate Elevation Elevation TW-13 682.86 682.98 0.12 Shallow Overburden CAR-1 670.69 671.67 0.98 Upper Unconsolidated AR-2_ 816.79 810.88 -5.91 Upper Galena-Platteville MW-1 807.70 804.74 -2.96 Upper Galena-Platteville MW-3 788.74 788.18 -0.56 Upper Galena-Platteville AR-3 803.14 803.18 0.04 Upper Galena-Platteville AR-4 741.62 743.23 1.61 Upper Galena-Platteville DF-24 724.42 726.07 1.65 Upper Galena-Platteville AR-10 837.04 839.87 2.83 Upper Galena-Platteville WELL-7 790.65 793.56 2.91 Upper Galena-Platteville AR-9 826.91 830.44 3.53 Upper Galena-Platteville AR-1 829.59 833.30 3.71 Upper Galena-Platteville AR-i7 778.32 782.48 4.16 Upper Galena-Platteville AR-8 835.79 840.61 4.82 Upper Galena-Platteville CAR-3 828.57 835.16 6.59 Upper Galena-Platteville AR-11 743.05 744.62 1.57 Lower Galena-Platteville Explanation:

1 -Groundwater fluctuations in AR-7 have ranged between 765.96 feet amsl (April 2006) and 793.61 feet amsl (April 2009).2 -Groundwater fluctuations in AR-2 have ranged between 797.48 feet amsl (November 2006) and 828.53 feet amsl (July 2011).3 -Groundwater fluctuations in AR-8 have ranged between 816.14 feet amsl (April 2006) and 851.76 feet amsl (September 2008).4 -The elevated groundwater fluctuations in Well-7, CAR-3, and AR-9 are due to the Circulating Water System piping leak near Cooling Tower 1.Byron Change Tables (3Q 2013)Page 1 of 1 AMO Environmental Decisions AR-4 Tritium Result vs. Groundwater Elevation---*Tritium Result ---Groundwater Elevation 10,000 .758 756 754 =U)2 E 752 o 0 750 M ai1,000*_ _ _-_748 0 E746 0 744 0 742 100 1 1 1 1 1 1 1740 (0 O (0 O CD .t- .I- .F... r-- 00 00 00 00 C "D 0) 0 C) 0 C) OD C'- N' C-- M4 M4 C o 0 0) 0 0 0D a C0 C0 C C 0 0 a 0 T-." ---V- ---- .- r-- 'r- r-- r.- r- T- -o 0) 0 0 0 0ý 0 0 0 0 C0 0 C0 0 0 0 C0 0 CD 0 0 0 0 0) C0 C0 C0 C 0 C T" IV- T-" T I 0 -'"r-- " I .V0 T.- 'r- r- 0 r- VI- 0.- ' ". I 0 T.- T " ' .a Date AR-7 Tritium Result vs. Groundwater Elevation Trend-- Tritium Result Groundwater Elevation 10,000 800.00" _795.00.___790.00 Z-E 785.00 o 0" 1,000 780.00 .*o _ _ _ _00 S775.00 0 770.00 Q 765.00 100

  • 760.00 0 o o -o N N N N N N o N N N N N M N N M N N N N N N S- q- !t t -g z !t I -g -z g :t !t g "I -T t --t g ;t Nt C- f -C) --- -qTr, C' -.- -C r- CD I-- C I -a ;r-Date AR-11 Tritium Result vs. Groundwater Elevation-- Tritium Result --- Groundwater Elevation 10,000 755.00 750.00 745.00 740.00 E 0 735.00 0 1,000 730.00 2 o00 o 725.00 'E 720.00 C,.715.00 710.00 100 ..705.00 r.D ( rO P0 I- I- -ýO 0 (0 CO O 0O000'-'--

'-- N N N N C ý) o3 oC'o CD CD CO ) CO CD 0 C C ) CD CD O O a V,' -T ,-- T--,- T,- '.- ',c ,-.- T-C) o O C) D C:) 0 CD C) ) C 0 0 CO C C CD 0 0 CD 0 C a C) CD CD CD D CD C.(. N NN N N, N N Cq N N N Nq C NNNN tr*- 0 -:- qr o a -1.- o'- a ' r- 0' r -0C- Wt r. 0 V-- T- V.- I'-Date 0O 0~DF-24 0 0 0 00 a 0 Ob @AR-3 0.. .. ....0 0 a 0 600 1,200= Feet Explanation:

3rd Qtr. 2013 Upper Galena Formation Tritium Sample Location* Result 200 to 2,000 pCi/L* Result < 200 pCi/L Figure la 3rd Qtr. 2013 RGPP Tritium Sample Locations Upper Galena-Platteville Formation Exelon Corporation Byron Generating Station 945 a 0 0 00.0.. .........\.. ... ......°. ... ...0 a 0 0 K.--0 600 1,200 Feet Explanation:

3rd Qtr. 2013 Lower Galena Formation Tritium Sample Location* Result 200 to 2,000 pCi/L-AR-11 was the only Lower Galena-Platteville Formation well sampled during the 3rd quarter 2013 RGPP sampling round Figure lb 3rd Qtr. 2013 RGPP Tritium Sample Locations Lower Galena-Platteville Formation Exelon Corporation Byron Generating Station 0 0 0 AR-4 746+223 0 a ab 0 a@~0 a a'N Explanation:

0 600 1,200 3rd Qtr. 2013 Upper Galena Formation Tritium Concentration Change o Feet E Increase in Tritium Concentration

  • Decrease in Tritium Concentration 306 -Tritium concentration presented in pico-curies per liter (pCi/L)-45 -Difference in tritium concentration between the 2nd qtr. 2013 and 3rd qtr. 2013 RGPP sampling rounds.-Only sample locations with detected tritium concentrations during the 2nd qtr. 2013 or 3rd qtr. 2013 RGPP sampling rounds are depicted.Figure 2a 3rd Qtr. 2013 RGPP Tritium Concentration Change Upper Galena-Platteville Formation Exelon Corporation Byron Generating Station AR-11 945+12 a 40 0 800 0 00 a a 0 @0 0 0 0 0 600 1,200 Explanation:

Feet 3rd Qtr. 2013 Lower Galena Formation Tritium Concentration Change E Increase in Tritium Concentration 945 -Tritium concentration presented in pico-curies per liter (pCi/L)+12 -Difference in tritium concentration between the 2nd qtr. 2013 and 3rd qtr. 2013 RGPP sampling rounds.-Only sample locations with detected tritium concentrations during the 2nd qtr. 2013 or 3rd qtr. 2013 RGPP sampling rounds are depicted.Figure 2b 3rd Qtr. 2013 RGPP Tritium Concentration Change Lower Galena-Platteville Formation Exelon Corporation Byron Generating Station Byron Generating Station Exelon Corporation Appendix A Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer TW-13 4/27/2006 157 U Shallow Overburden TW-13 4/27/2006 201 + Shallow Overburden TW-13 11/1/2006 186 U Shallow Overburden TW-13 4/20/2007 152 U Shallow Overburden TW-13 10/8/2007 171 U Shallow Overburden TW-13 5/28/2008 188 U Shallow Overburden TW-13 10/2/2008 164 U Shallow Overburden TW-13 4/29/2009 152 U Shallow Overburden TW-13 10/14/2009 151 U Shallow Overburden TW-13 5/19/2010 153 U Shallow Overburden TW-13 10/21/2010 161 U Shallow Overburden TW-13 5/9/2011 185 U Shallow Overburden TW-13 11/2/2011 181 U Shallow Overburden TW-13 5/16/2012 164 U Shallow Overburden TW-13 10/17/2012 159 U Shallow Overburden TW-13 5/22/2013 175 U Shallow Overburden TW-14 4/27/2006 153 U Shallow Overburden TW-14 11/1/2006 189 U Shallow Overburden TW-14 4/20/2007 154 U Shallow Overburden TW-14 10/8/2007 176 U Shallow Overburden TW-14 5/28/2008 186 U Shallow Overburden TW-14 10/2/2008 168 U Shallow Overburden TW-14 4/29/2009 Not Sampled U Shallow Overburden TW-15 4/27/2006 159 U Shallow Overburden TW-15 11/1/2006 185 U Shallow Overburden TW-15 4/20/2007 156 U Shallow Overburden TW-15 10/8/2007 176 U Shallow Overburden TW-15 5/28/2008 186 U Shallow Overburden TW-15 10/2/2008 164 U Shallow Overburden TW-15 4/29/2009 Not Sampled U Shallow Overburden CAR-1 4/27/2006 154 U Upper Unconsolidated CAR-1 11/1/2006 190 U Upper Unconsolidated CAR-1 4/20/2007 155 U Upper Unconsolidated CAR-1 10/8/2007 174 U Upper Unconsolidated CAR-1 5/28/2008 187 U Upper Unconsolidated CAR-1 10/1/2008 166 U Upper Unconsolidated CAR-i 4/29/2009 152 U Upper Unconsolidated CAR-I 10/14/2009 149 U Upper Unconsolidated CAR-1 5/17/2010 Not Sampled U Upper Unconsolidated CAR-i 10/20/2010 157 U Upper Unconsolidated CAR-1 5/9/2011 191 U Upper Unconsolidated CAR-1 11/2/2011 184 U Upper Unconsolidated CAR-1 5/16/2012 168 U Upper Unconsolidated CAR-1 10/17/2012 159 U Upper Unconsolidated CAR-1 5/22/2013 179 U Upper Unconsolidated AR-1 4/26/2006 165 U Upper Galena-Platteville AR-1 11/1/2006 185 U Upper Galena-Platteville AR-1 4/20/2007 153 U Upper Galena-Platteville AR-1 10/8/2007 180 U Upper Galena-Platteville AR-1 6/2/2008 187 U Upper Galena-Platteville AR-1 9/30/2008 163 U Upper Galena-Platteville AR-1 4/27/2009 157 U Upper Galena-Platteville AR-1 10/15/2009 165 U Upper Galena-Platteville AR-1 5/17/2010 154 U Upper Galena-Platteville AR-i 10/22/2010 159 U Upper Galena-Platteville AR-1 3/7/2011 139 U Upper Galena-Platteville AR-1 5/3/2011 184 U Upper Galena-Platteville AR-1 7/19/2011 172 U Upper Galena-Platteville AR-1 11/2/2011 181 U Upper Galena-Platteville AR-1 3/6/2012 174 U Upper Galena-Platteville AR-1 5/14/2012 175 U Upper Galena-Platteville Byron Change Tables (30 2013)Page 1 of 7 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-1 8/20/2012 170 U Upper Galena-Platteville AR-1 10/16/2012 173 U Upper Galena-Platteville AR-1 3/18/2013 191 U Upper Galena-Platteville AR-1 5/21/2013 170 U Upper Galena-Platteville AR-1 8/13/2013 188 U Upper Galena-Platteville AR-1 0 4/26/2006 185 U Upper Galena-Platteville AR-10 11/1/2006 188 U Upper Galena-Platteville AR-10 4/15/2007 156 U Upper Galena-Platteville AR-10 10/8/2007 178 + Upper Galena-Platteville AR-10 6/2/2008 189 U Upper Galena-Platteville AR-10 9/30/2008 160 U Upper Galena-Platteville AR-10 4/27/2009 155 U Upper Galena-Platteville AR-10 10/15/2009 194 U Upper Galena-Platteville AR-10 5/17/2010 157 U Upper Galena-Platteville AR-10 10/22/2010 160 U Upper Galena-Platteville AR-10 3/7/2011 174 U Upper Galena-Platteville AR-10 5/3/2011 184 U Upper Galena-Platteville AR-10 7/19/2011 171 U Upper Galena-Platteville AR-10 11/2/2011 189 U Upper Galena-Platteville AR-10 3/6/2012 173 U Upper Galena-Platteville AR-10 5/14/2012 174 U Upper Galena-Platteville AR-10 8/20/2012 173 U Upper Galena-Platteville AR-10 10/16/2012 172 U Upper Galena-Platteville AR-10 3/18/2013 187 U Upper Galena-Platteville AR-10 5/20/2013 173 U Upper Galena-Platteville AR-10 8/13/2013 190 U Upper Galena-Platteville AR-2 4/26/2006 432 + Upper Galena-Platteville AR-2 4/26/2006 527 + Upper Galena-Platteville AR-2 11/1/2006 492 + Upper Galena-Platteville AR-2 11/1/2006 413 + Upper Galena-Platteville AR-2 4/18/2007 548 + Upper Galena-Platteville AR-2 10/8/2007 383 + Upper Galena-Platteville AR-2 5/29/2008 186 U Upper Galena-Platteville AR-2 10/1/2008 169 U Upper Galena-Platteville AR-2 4/29/2009 152 U Upper Galena-Platteville AR-2 10/15/2009 152 U Upper Galena-Platteville AR-2 5/19/2010 160 U Upper Galena-Platteville AR-2 10/20/2010 163 U Upper Galena-Platteville AR-2 5/9/2011 183 U Upper Galena-Platteville AR-2 11/2/2011 183 U Upper Galena-Platteville AR-2 5/16/2012 169 U Upper Galena-Platteville AR-2 10/17/2012 157 U Upper Galena-Platteville AR-2 5/22/2013 166 U Upper Galena-Platteville AR-3 3/24/2006 214 + Upper Galena-Platteville AR-3 3/24/2006 160 Upper Galena-Platteville AR-3 3/24/2006 271 + Upper Galena-Platteville AR-3 3/24/2006 198 Upper Galena-Platteville AR-3 3/24/2006 207 + Upper Galena-Platteville AR-3 3/27/2006 459 + Upper Galena-Platteville AR-3 3/27/2006 346 + Upper Galena-Platteville AR-3 3/29/2006 372 + Upper Galena-Platteville AR-3 4/3/2006 489 + Upper Galena-Platteville AR-3 4/10/2006 351 + Upper Galena-Platteville AR-3 4/26/2006 389 + Upper Galena-Platteville AR-3 4/26/2006 234 + Upper Galena-Platteville AR-3 6/22/2006 224 + Upper Galena-Platteville AR-3 7/20/2006 225 + Upper Galena-Platteville AR-3 11/1/2006 253 + Upper Galena-Platteville AR-3 11/1/2006 190 U Upper Galena-Platteville AR-3 4/18/2007 327 + Upper Galena-Platteville AR-3 10/8/2007 965 + Upper Galena-Platteville Byron Change Tables (30 2013)Page 2 of 7 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-3 10/8/2007 1,110 + Upper Galena-Platteville AR-3 11/27/2007 1,180 + Upper Galena-Platteville AR-3 1/8/2008 757 + Upper Galena-Platteville AR-3 5/29/2008 186 U Upper Galena-Platteville AR-3 10/1/2008 163 U Upper Galena-Platteville AR-3 4/29/2009 155 U Upper Galena-Platteville AR-3 10/14/2009 149 U Upper Galena-Platteville AR-3 5/19/2010 156 U Upper Galena-Platteville AR-3 10/20/2010 162 U Upper Galena-Platteville AR-3 3/7/2011 149 U Upper Galena-Platteville AR-3 5/9/2011 188 U Upper Galena-Platteville AR-3 7/20/2011 170 U Upper Galena-Platteville AR-3 11/2/2011 181 U Upper Galena-Platteville AR-3 3/7/2012 169 U Upper Galena-Platteville AR-3 5/16/2012 172 U Upper Galena-Platteville AR-3 8/15/2012 193 U Upper Galena-Platteville AR-3 10/17/2012 158 U Upper Galena-Platteville AR-3 3/20/2013 190 U Upper Galena-Platteville AR-3 5/22/2013 173 U Upper Galena-Platteville AR-3 8/14/2013 188 U Upper Galena-Platteville AR-4 4/27/2006 3,260 + Upper Galena-Platteville AR-4 4/27/2006 4,080 + Upper Galena-Platteville AR-4 11/21/2006 2,980 + Upper Galena-Platteville AR-4 11/21/2006 2,440 + Upper Galena-Platteville AR-4 11/21/2006 2,610 + Upper Galena-Platteville AR-4 11/21/2006 2,880 + Upper Galena-Platteville AR-4 5/1/2007 3,050 + Upper Galena-Platteville AR-4 10/10/2007 2,890 + Upper Galena-Platteville AR-4 5/28/2008 2,150 + Upper Galena-Platteville AR-4 10/1/2008 1,910 + Upper Galena-Platteville AR-4 4/29/2009 1,350 + Upper Galena-Platteville AR-4 10/15/2009 1,360 + Upper Galena-Platteville AR-4 5/19/2010 1,250 + Upper Galena-Platteville AR-4 10/21/2010 1,170 + Upper Galena-Platteville AR-4 3/7/2011 875 + Upper Galena-Platteville AR-4 5/9/2011 818 + Upper Galena-Platteville AR-4 7/20/2011 777 + Upper Galena-Platteville AR-4 11/2/2011 912 + Upper Galena-Platteville AR-4 3/7/2012 861 + Upper Galena-Platteville AR-4 5/16/2012 802 + Upper Galena-Platteville AR-4 8/15/2012 872 + Upper Galena-Platteville AR-4 10/17/2012 830 + Upper Galena-Platteville AR-4 3/20/2013 818 + Upper Galena-Platteville AR-4 5/22/2013 523 + Upper Galena-Platteville AR-4 8/14/2013 746 + Upper Galena-Platteville AR-5 4/27/2006 151 U Upper Galena-Platteville AR-5 11/21/2006 188 U Upper Galena-Platteville AR-5 4/21/2007 170 U Upper Galena-Platteville AR-5 10/10/2007 178 U Upper Galena-Platteville AR-5 5/28/2008 184 U Upper Galena-Platteville AR-5 10/1/2008 166 U Upper Galena-Platteville AR-5 4/29/2009 NA U Upper Galena-Platteville AR-6 4/27/2006 153 U Upper Galena-Platteville AR-6 11/21/2006 190 U Upper Galena-Platteville AR-6 4/21/2007 169 U Upper Galena-Platteville AR-6 10/10/2007 179 U Upper Galena-Platteville AR-6 5/28/2008 188 U Upper Galena-Platteville AR-6 10/1/2008 171 U Upper Galena-Platteville AR-6 4/29/2009 NA U Upper Galena-Platteville AR-7 4/27/2006 160 U Upper Galena-Platteville AR-7 10/30/2006 187 U Upper Galena-Platteville Byron Change Tables (3Q 2013)Page 3 of 7 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-7 4/15/2007 151 U Upper Galena-Platteville AR-7 10/8/2007 179 U Upper Galena-Platteville AR-7 6/2/2008 228 + Upper Galena-Platteville AR-7 9/30/2008 161 U Upper Galena-Platteville AR-7 4/27/2009 157 U Upper Galena-Platteville AR-7 10/13/2009 170 U Upper Galena-Platteville AR-7 5/17/2010 179 + Upper Galena-Platteville AR-7 10/21/2010 171 U Upper Galena-Platteville AR-7 3/7/2011 166 U Upper Galena-Platteville AR-7 5/3/2011 199 + Upper Galena-Platteville AR-7 7/19/2011 291 + Upper Galena-Platteville AR-7 11/2/2011 318 + Upper Galena-Platteville AR-7 1/6/2012 234 + Upper Galena-Platteville AR-7 3/2/2012 175 U Upper Galena-Platteville AR-7 5/14/2012 200 U Upper Galena-Platteville AR-7 8/20/2012 182 + Upper Galena-Platteville AR-7 10/16/2012 191 + Upper Galena-Platteville AR-7 3/18/2013 245 + Upper Galena-Platteville AR-7 5/20/2013 351 + Upper Galena-Platteville AR-7 8/12/2013 306 + Upper Galena-Platteville AR-8 4/27/2006 161 U Upper Galena-Platteville AR-8 10/30/2006 192 U Upper Galena-Platteville AR-8 4/15/2007 152 U Upper Galena-Platteville AR-8 10/8/2007 180 U Upper Galena-Platteville AR-8 6/2/2008 185 U Upper Galena-Platteville AR-8 9/30/2008 169 U Upper Galena-Platteville AR-8 4/27/2009 151 U Upper Galena-Platteville AR-8 10/13/2009 163 U Upper Galena-Platteville AR-8 5/17/2010 150 U Upper Galena-Platteville AR-8 10/21/2010 163 U Upper Galena-Platteville AR-8 3/7/2011 155 U Upper Galena-Platteville AR-8 5/3/2011 187 U Upper Galena-Platteville AR-8 7/19/2011 173 U Upper Galena-Platteville AR-8 11/2/2011 185 U Upper Galena-Platteville AR-8 3/6/2012 171 U Upper Galena-Platteville AR-8 5/14/2012 172 U Upper Galena-Platteville AR-8 8/20/2012 173 U Upper Galena-Platteville AR-8 10/16/2012 174 U Upper Galena-Platteville AR-8 3/18/2013 189 U Upper Galena-Platteville AR-8 5/20/2013 178 U Upper Galena-Platteville AR-8 8/12/2013 190 U Upper Galena-Platteville AR-9 4/27/2006 155 U Upper Galena-Platteville AR-9 10/30/2006 191 U Upper Galena-Platteville AR-9 4/20/2007 155 U Upper Galena-Platteville AR-9 10/8/2007 178 U Upper Galena-Platteville AR-9 6/2/2008 189 U Upper Galena-Platteville AR-9 9/30/2008 164 U Upper Galena-Platteville AR-9 4/27/2009 153 U Upper Galena-Platteville AR-9 10/13/2009 182 U Upper Galena-Platteville AR-9 5/17/2010 150 U Upper Galena-Platteville AR-9 10/22/2010 161 U Upper Galena-Platteville AR-9 3/7/2011 182 U Upper Galena-Platteville AR-9 5/3/2011 184 U Upper Galena-Platteville AR-9 7/19/2011 171 U Upper Galena-Platteville AR-9 11/2/2011 189 U Upper Galena-Platteville AR-9 3/6/2012 172 U Upper Galena-Platteville AR-9 5/14/2012 173 U Upper Galena-Platteville AR-9 8/20/2012 171 U Upper Galena-Platteville AR-9 10/16/2012 171 U Upper Galena-Platteville AR-9 3/18/2013 192 U Upper Galena-Platteville AR-9 5/21/2013 177 U Upper Galena-Platteville Byron Change Tables (3Q 2013)Page 4 of 7 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer AR-9 8/12/2013 187 U Upper Galena-Platteville CAR-2 4/27/2006 159 U Upper Galena-Platteville CAR-2 11/2/2006 187 U Upper Galena-Platteville CAR-2 4/20/2007 152 U Upper Galena-Platteville CAR-2 10/8/2007 175 U Upper Galena-Platteville CAR-2 5/28/2008 191 U Upper Galena-Platteville CAR-2 10/1/2008 158 U Upper Galena-Platteville CAR-2 4/29/2009 NA U Upper Galena-Platteville CAR-3 4/27/2006 150 U Upper Galena-Platteville CAR-3 10/30/2006 198 U Upper Galena-Platteville CAR-3 4/15/2007 157 U Upper Galena-Platteville CAR-3 10/8/2007 178 U Upper Galena-Platteville CAR-3 6/2/2008 185 U Upper Galena-Platteville CAR-3 9/30/2008 167 U Upper Galena-Platteville CAR-3 4/27/2009 153 U Upper Galena-Platteville CAR-3 10/13/2009 191 U Upper Galena-Platteville CAR-3 5/17/2010 158 U Upper Galena-Platteville CAR-3 10/21/2010 160 U Upper Galena-Platteville CAR-3 3/7/2011 151 U Upper Galena-Platteville CAR-3 5/3/2011 184 U Upper Galena-Platteville CAR-3 7/19/2011 170 U Upper Galena-Platteville CAR-3 11/2/2011 166 U Upper Galena-Platteville CAR-3 3/6/2012 171 U Upper Galena-Platteville CAR-3 5/14/2012 174 U Upper Galena-Platteville CAR-3 8/20/2012 172 U Upper Galena-Platteville CAR-3 10/16/2012 175 U Upper Galena-Platteville CAR-3 3/18/2013 188 U Upper Galena-Platteville CAR-3 5/20/2013 171 U Upper Galena-Platteville CAR-3 8/12/2013 185 U Upper Galena-Platteville DF-13 4/26/2006 158 U Upper Galena-Platteville DF-19 4/25/2006 187 U Upper Galena-Platteville DF-1S 4/25/2006 185 U Upper Galena-Platteville DF-24 4/26/2006 162 U Upper Galena-Platteville DF-24 11/21/2006 191 U Upper Galena-Platteville DF-24 4/19/2007 170 U Upper Galena-Platteville DF-24 10/10/2007 179 U Upper Galena-Platteville DF-24 5/28/2008 188 U Upper Galena-Platteville DF-24 10/1/2008 167 U Upper Galena-Platteville DF-24 4/29/2009 154 U Upper Galena-Platteville DF-24 10/14/2009 170 U Upper Galena-Platteville DF-24 5/19/2010 157 U Upper Galena-Platteville DF-24 10/21/2010 157 U Upper Galena-Platteville DF-24 3/7/2011 152 U Upper Galena-Platteville DF-24 5/9/2011 185 U Upper Galena-Platteville DF-24 7/20/2011 170 U Upper Galena-Platteville DF-24 11/2/2011 184 U Upper Galena-Platteville DF-24 3/7/2012 173 U Upper Galena-Platteville DF-24 5/16/2012 167 U Upper Galena-Platteville DF-24 8/15/2012 194 U Upper Galena-Platteville DF-24 10/17/2012 158 U Upper Galena-Platteville DF-24 3/20/2013 187 U Upper Galena-Platteville DF-24 5/22/2013 178 U Upper Galena-Platteville DF-24 8/14/2013 190 U Upper Galena-Platteville DF-2S 4/25/2006 186 U Upper Galena-Platteville DF-3S 4/25/2006 190 U Upper Galena-Platteville DF-4DS 4/25/2006 191 U Upper Galena-Platteville GW-9 4/28/2006 159 U Upper Galena-Platteville GW-9 11/21/2006 190 U Upper Galena-Platteville GW-9 4/21/2007 168 U Upper Galena-Plattevilie GW-9 10/10/2007 175 U Upper Galena-Platteville GW-9 5/29/2008 181 U Upper Galena-Platteville Byron Change Tables (3Q 2013)Page 5 of 7 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix A Summary of Tritium Concentrations Sample ID Sample Date Result Qual Aquifer GW-9 10/2/2008 163 U Upper Galena-Platteville GW-9 4/29/2009 NA U Upper Galena-Platteville MW-1 4/26/2006 189 U Upper Galena-Platteville MW-1 11/1/2006 186 U Upper Galena-Platteville MW-1 4/19/2007 149 U Upper Galena-Platteville MW-1 10/8/2007 176 U Upper Galena-Platteville MW-1 5/29/2008 186 U Upper Galena-Platteville MW-1 10/1/2008 172 U Upper Galena-Platteville MW-1 4/29/2009 NA U Upper Galena-Platteville MW-1 5/16/2012 167 U Upper Galena-Platteville MW-1 10/17/2012 160 U Upper Galena-Platteville MW-1 5/22/2013 181 U Upper Galena-Platteville MW-3 4/26/2006 182 U Upper Galena-Platteville MW-3 11/1/2006 186 U Upper Galena-Platteville MW-3 4/19/2007 158 U Upper Galena-Platteville MW-3 10/8/2007 177 U Upper Galena-Platteville MW-3 5/29/2008 186 U Upper Galena-Platteville MW-3 10/1/2008 Dry Upper Galena-Platteville MW-3 5/16/2012 163 U Upper Galena-Platteville MW-3 10/17/2012 157 U Upper Galena-Platteville MW-3 5/22/2013 180 U Upper Galena-Platteville MW-30 4/28/2006 160 U Upper Galena-Platteville PC-1B 4/26/2006 161 U Upper Galena-Platteville PC-2B 4/25/2006 175 U Upper Galena-Platteville PC-5B 4/26/2006 165 U Upper Galena-Platteville PC-6B 4/26/2006 165 U Upper Galena-Platteville WELL-7 4/27/2006 164 U Upper Galena-Platteville WELL-7 4/27/2006 159 U Upper Galena-Platteville WELL-7 10/10/2007 189 U Upper Galena-Platteville WELL-7 5/29/2008 186 U Upper Galena-Platteville WELL-7 10/2/2008 150 U Upper Galena-Platteville WELL-7 4/29/2009 NA U Upper Galena-Platteville AR-11 4/26/2006 2,340 + Lower Galena-Platteville AR-11 11/21/2006 1,780 + Lower Galena-Platteville AR-11 11/21/2006 1,710 + Lower Galena-Platteville AR-1 1 11/21/2006 2,070 + Lower Galena-Platteville AR-11 11/21/2006 1,860 + Lower Galena-Platteville AR-11 4/23/2007 1,820 + Lower Galena-Platteville AR-1i 10/10/2007 1,300 + Lower Galena-Platteville AR-11 5/28/2008 1,220 + Lower Galena-Platteville AR-11 10/1/2008 1,280 + Lower Galena-Platteville AR-11 4/29/2009 1,110 + Lower Galena-Platteville AR-11 10/15/2009 1,010 + Lower Galena-Platteville AR-11 5/20/2010 1,120 + Lower Galena-Platteville AR-11 10/21/2010 947 + Lower Galena-Platteville AR-11 3/7/2011 827 + Lower Galena-Platteville AR-11 5/9/2011 919 + Lower Galena-Platteville AR-1 1 7/20/2011 1,150 + Lower Galena-Platteville AR-1i 11/2/2011 894 + Lower Galena-Platteville AR-11 3/7/2012 1,100 + Lower Galena-Platteville AR-11 5/16/2012 1,110 + Lower Galena-Platteville AR-11 8/15/2012 1,210 + Lower Galena-Platteville AR-11 10/17/2012 994 + Lower Galena-Platteville AR-1 1 3/20/2013 850 + Lower Galena-Platteville AR-11 5/22/2013 933 + Lower Galena-Platteville AR-11 8/14/2013 945 + Lower Galena-Platteville DF-12 4/25/2006 175 U Lower Galena-Platteville DF-1D. 4/25/2006 176 U Lower Galena-Platteville DF-6 4/25/2006 176 U Lower Galena-Platteville MW-36 4/25/2006 176 U Lower Galena-Platteville MW-2 4/27/2006 157 U St. Peter Sandstone AMO Environmental Decisions Byron Change Tables (30 2013)Page 6 of 7 Byron Generating Station Exelon Corporation Appendix A.Summary of Tritium Concentrations Sample ID MW-37 MW-39 PC-1C ISample Date 4/26/0 6 4/26/2006 V4/26/206r7 e Result Qual Aquifer 158 U St. Peter Sandstone 158 U St. Peter Sandstone 164 U St. Peter Sandstone Al concentrations presented In pico-curles per liter.Explanation:

2,340 -Bold concentrations represent exceedences of the Lower Limit of Detection of 200 pico-curies per liter.U -Tritium not detected above the laboratory detection limit.+ -Tritium detected above the laboratory detection limit.Byron Change Tables (3012013)Page 7 of 7 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer DF-7S 4/24/2006 Not Measured Shallow Overburden TW-13 4/27/2006 683.36 Shallow Overburden TW-13 11/1/2006 683.05 Shallow Overburden TW-13 4/20/2007 Not Measured Shallow Overburden TW-13 10/8/2007 682.84 Shallow Overburden TW-13 5/28/2008 683.86 Shallow Overburden TW-13 9/29/2008 683.57 Shallow Overburden TW-13 4/29/2009 684226 Shallow Overburden TW-13 10/14/2009 683.38 Shallow Overburden TW-13 5/17/2010 684.22 Shallow Overburden TW-13 10/21/2010 683.27 Shallow Overburden TW-13 3/8/2011 683.70 Shallow Overburden TW-13 5/9/2011 682.83 Shallow Overburden TW-13 7/20/2011 683.26 Shallow Overburden TW-13 11/2/2011 682.97 Shallow Overburden TW-13 3/7/2012 683.20 Shallow Overburden TW-13 5/16/2012 683.26 Shallow Overburden TW-13 8/15/2012 682.86 Shallow Overburden TW-13 10/17/2012 682.86 Shallow Overburden TW-13 3/18/2013 683.19 Shallow Overburden TW-13 5/22/2013 683.72 Shallow Overburden TW-13 8/14/2013 682.98 Shallow Overburden TW-14 4/27/2006 672.93 Shallow Overburden TW-14 11/1/2006 672.11 Shallow Overburden TW-14 4/20/2007 Not Measured Shallow Overburden TW-14 10/8/2007 672.41 Shallow Overburden TW-14 5/28/2008 674.46 Shallow Overburden TW-14 9/29/2008 672.71 Shallow Overburden TW-14 4/29/2009 677.15 Shallow Overburden TW-14 10/14/2009 672.39 Shallow Overburden TW-14 5/17/2010 676.96 Shallow Overburden TW-14 10/21/2010 672.05 Shallow Overburden TW-14 3/8/2011 674.55 Shallow Overburden TW-14 5/7/2011 675.10 Shallow Overburden TW-14 7/20/2011 672.00 Shallow Overburden TW-14 11/2/2011 671.66 Shallow Overburden TW-15 4/27/2006 672.89 Shallow Overburden TW-15 11/1/2006 672.01 Shallow Overburden TW-15 4/20/2007 Not Measured Shallow Overburden TW-15 10/8/2007 672.48 Shallow Overburden TW-15 5/28/2008 674.46 Shallow Overburden TW-15 9/29/2008 672.73 Shallow Overburden TW-15 4/29/2009 677.12 Shallow Overburden TW-15 10/14/2009 672.38 Shallow Overburden TW-15 5/17/2010 676.93 Shallow Overburden TW-15 10/21/2010 672.03 Shallow Overburden TW-15 3/8/2011 674.53 Shallow Overburden TW-15 5/7/2011 675.05 Shallow Overburden TW-15 7/20/2011 671.97 Shallow Overburden TW-15 11/2/2011 671.63 Shallow Overburden CAR-1 3/23/2006 672.22 Upper Unconsolidated CAR-1 4/4/2006 672.20 Upper Unconsolidated CAR-1 4/27/2006 672.63 Upper Unconsolidated CAR-1 11/1/2006 671.92 Upper Unconsolidated CAR-1 4/20/2007 Not Measured Upper Unconsolidated CAR-1 10/8/2007 667.37 Upper Unconsolidated CAR-1 5/28/2008 673.79 Upper Unconsolidated CAR-1 9/29/2008 672.37 Upper Unconsolidated CAR-1 4/29/2009 675.99 Upper Unconsolidated Byron Change Tables (3012013)Page 1 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B.Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer CAR-1 10/14/2009 672.00 Upper Unconsolidated CAR-1 5/17/2010 675.82 Upper Unconsolidated CAR-1 10/20/2010 671.70 Upper Unconsolidated CAR-i 3/8/2011 674.06 Upper Unconsolidated CAR-1 5/9/2011 674.10 Upper Unconsolidated CAR-1 7/20/2011 671.60 Upper Unconsolidated CAR-1 11/2/2011 671.41 Upper Unconsolidated CAR-1 3/7/2012 672.48 Upper Unconsolidated CAR-1 5/16/2012 672.40 Upper Unconsolidated CAR-1 8/15/2012 670.69 Upper Unconsolidated CAR-1 10/17/2012 670.70 Upper Unconsolidated CAR-i 3/18/2013 674.55 Upper Unconsolidated CAR-1 5/22/2013 673.92 Upper Unconsolidated CAR-i 8/14/2013 671.67 Upper Unconsolidated DF-7D 4/24/2006 675.08 Middle Unconsolidated AR-i 3/23/2006 831.40 Upper Galena-Platteville AR-A 4/4/2006 831.38 Upper Galena-Platteville AR-1 4/26/2006 835.94 Upper Galena-Platteville AR-1 11/1/2006 833.22 Upper Galena-Platteville AR-1 4/20/2007 Not Measured Upper Galena-Platteville AR-1 6/2/2008 837.43 Upper Galena-Platteville AR-1 9/29/2008 838.69 Upper Galena-Platteville.

AR-1 4/29/2009

.837.55 Upper Galena-Platteville AR-1 10/13/2009 836.24 Upper Galena-Platteville AR-i 5/17/2010 834.98 Upper Galena-Platteville AR-1 10/22/2010 832.90 Upper Galena-Platteville AR-1 3/7/2011 832.92 Upper Galena-Platteville AR-1 5/9/2011 835.71 Upper Galena-Platteville AR-i 7/19/2011 834.28 Upper Galena-Platteville AR-1 11/2/2011 834.07 Upper Galena-Platteville AR-i 3/6/2012 830.95 Upper Galena-Platteville AR-i 5/14/2012 832.14 Upper Galena-Platteville AR-i 8/20/2012 829.59 Upper Galena-Platteville AR-1 10/16/2012 828.57 Upper Galena-Platteville AR-I 3/18/2013 831.09 Upper Galena-Platteville AR-1 5/22/2013 835.99 Upper Galena-Platteville AR-1 8/14/2013 833.30 Upper Galena-Platteville AR-10 4/26/2006 837.66 Upper Galena-Platteville AR-10 11/1/2006 837.45 Upper Galena-Platteville AR-10 4/15/2007 Not Measured Upper Galena-Platteville AR-1 0 6/2/2008 842.97 Upper Galena-Platteville AR-1 0 9/29/2008 842.13 Upper Galena-Platteville AR-10 10/1/2008 842.13 Upper Galena-Platteville AR-1 0 4/29/2009 843.90 Upper Galena-Platteville AR-10 10/13/2009 842.30 Upper Galena-Platteville AR-10 5/17/2010 843.01 Upper Galena-Platteville AR-10 10/22/2010 841.06 Upper Galena-Platteville AR-10 3/7/2011 839.44 Upper Galena-Platteville AR-10 5/9/2011 841.10 Upper Galena-Platteville AR-10 7/19/2011 840.75 Upper Galena-Platteville AR-10 11/2/2011 839.52 Upper Galena-Platteville AR-10 3/6/2012 838.61 Upper Galena-Platteville AR-10 5/14/2012 838.90 Upper Galena-Platteville AR-10 8/20/2012 837.04 Upper Galena-Platteville AR-10 10/16/2012 836.40 Upper Galena-Platteville AR-10 3/18/2013 835.76 Upper Galena-Platteville AR-10 5/22/2013 840.64 Upper Galena-Platteville AR-10 8/14/2013 839.87 Upper Galena-Platteville AR-2 3/23/2006 798.68 Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (3Q 2013)Page 2 of 10 Byron Generating Station Exelon Corporation Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-2 4/4/2006 798.31 Upper Galena-Platteville AR-2 4/26/2006 798.50 Upper Galena-Platteville AR-2 11/1/2006 797.48 Upper Galena-Platteville AR-2 4/18/2007 Not Measured Upper Galena-Platteville AR-2 10/8/2007 803.96 Upper Galena-Platteville AR-2 5/29/2008 812.58 Upper Galena-Platteville AR-2 9/29/2008 811.18 Upper Galena-Platteville AR-2 4/29/2009 818.53 Upper Galena-Platteville AR-2 10/13/2009 812.98 Upper Galena-Platteville AR-2 5/17/2010 818.47 Upper Galena-Platteville AR-2 10/20/2010 815.67 Upper Galena-Platteville AR-2 3/7/2011 809.56 Upper Galena-Platteville AR-2 5/9/2011 817.03 Upper Galena-Platteville AR-2 7/20/2011 828.53 Upper Galena-Platteville AR-2 11/2/2011 813.87 Upper Galena-Platteville AR-2 3/7/2012 809.18 Upper Galena-Platteville AR-2 5/16/2012 824.77 Upper Galena-Platteville AR-2 8/15/2012 816.79 Upper Galena-Platteville AR-2 10/17/2012 817.16 Upper Galena-Platteville AR-2 3/18/2013 808.18 Upper Galena-Platteville AR-2 5/22/2013 812.10 Upper Galena-Platteville AR-2 8/14/2013 810.88 Upper Galena-Platteville AR-3 3/23/2006 798.16 Upper Galena-Platteville AR-3 4/4/2006 797.49 Upper Galena-Platteville AR-3 4/26/2006 796.87 Upper Galena-Platteville AR-3 11/1/2006 796.14 Upper Galena-Platteville AR-3 4/18/2007 Not Measured Upper Galena-Platteville AR-3 10/8/2007 802.31 Upper Galena-Platteville AR-3 5/29/2008 804.84 Upper Galena-Platteville AR-3 9/29/2008 803.14 Upper Galena-Platteville AR-3 4/29/2009 806.32 Upper Galena-Platteville AR-3 10/14/2009 804.10 Upper Galena-Platteville AR-3 5/17/2010 805.29 Upper Galena-Platteville AR-3 10/20/2010 804.62 Upper Galena-Platteville AR-3 3/7/2011 807.64 Upper Galena-Platteville AR-3 5/9/2011 804.49 Upper Galena-Platteville AR-3 7/20/2011 805.32 Upper Galena-Platteville AR-3 11/2/2011 803.72 Upper Galena-Platteville AR-3 3/7/2012 803.41 Upper Galena-Platteville AR-3 5/16/2012 803.73 Upper Galena-Platteville AR-3 8/15/2012 803.14 Upper Galena-Platteville AR-3 10/17/2012 802.79 Upper Galena-Platteville AR-3 3/18/2013 802.38 Upper Galena-Platteville AR-3 5/22/2013 804.10 Upper Galena-Platteville AR-3 8/14/2013 803.18 Upper Galena-Platteville AR-4 4/27/2006 742.74 Upper Galena-Platteville AR-4 11/21/2006 740.67 Upper Galena-Platteville AR-4 4/23/2007 Not Measured Upper Galena-Platteville AR-4 10/10/2007 744.24 Upper Galena-Platteville AR-4 5/28/2008 748.14 Upper Galena-Platteville AR-4 9/29/2008 744.64 Upper Galena-Platteville AR-4 4/29/2009 753.48 Upper Galena-Platteville AR-4 10/15/2009 745.02 Upper Galena-Platteville AR-4 5/17/2010 751.73 Upper Galena-Platteville AR-4 10/21/2010 743.84 Upper Galena-Platteville AR-4 3/7/2011 743.54 Upper Galena-Platteville AR-4 5/9/2011 749.44 Upper Galena-Platteville AR-4 7/20/2011 745.27 Upper Galena-Platteville AR-4 11/2/2011 743.37 Upper Galena-Platteville AMO Environmental Decisions Byron Change Tables (30 2013)Page 3 of 10 Byron Generating Station Exelon Corporation Appendix B.Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-4 3/7/2012 743.47 Upper Galena-Platteville AR-4 5/16/2012 744.84 Upper Galena-Platteville AR-4 8/15/2012 741.62 Upper Galena-Platteville AR-4 10/17/2012 740.53 Upper Galena-Platteville AR-4 3/18/2013 740.94 Upper Galena-Platteville AR-4 5/22/2013 746.57 Upper Galena-Platteville AR-4 8/14/2013 743.23 Upper Galena-Platteville AR-5 3/23/2006 687.90 Upper Galena-Platteville AR-5 4/4/2006 689.06 Upper Galena-Platteville AR-5 4/27/2006 688.08 Upper Galena-Platteville AR-5 11/21/2006 687.75 Upper Galena-Platteville AR-5 4/21/2007 Not Measured Upper Galena-Platteville AR-5 10/10/2007 687.42 Upper Galena-Platteville AR-5 5/28/2008 689.00 Upper Galena-Platteville AR-5 9/29/2008 688.20 Upper Galena-Platteville AR-5 4/28/2009 690.95 Upper Galena-Platteville AR-5 10/14/2009 688.48 Upper Galena-Platteville AR-5 5/17/2010 690.67 Upper Galena-Platteville AR-5 10/20/2010 688.29 Upper Galena-Platteville AR-5 3/7/2011 689.40 Upper Galena-Platteville AR-5 5/7/2011 690.12 Upper Galena-Platteville AR-5 7/20/2011 688.35 Upper Galena-Platteville AR-5 11/2/2011 687.94 Upper Galena-Platteville AR-6 3/23/2006 674.47 Upper Galena-Platteville AR-6 4/4/2006 674.68 Upper Galena-Platteville AR-6 4/27/2006 675.00 Upper Galena-Platteville AR-6 11/21/2006 674.75 Upper Galena-Platteville AR-6 4/21/2007 Not Measured Upper Galena-Platteville AR-6 10/10/2007 675.22 Upper Galena-Platteville AR-6 5/28/2008 676.65 Upper Galena-Platteville AR-6 9/29/2008 675.70 Upper Galena-Platteville AR-6 4/28/2009 678.55 Upper Galena-Platteville AR-6 10/14/2009 675.45 Upper Galena-Platteville AR-6 5/17/2010 679.35 Upper Galena-Platteville AR-6 10/20/2010 675.29 Upper Galena-Platteville AR-6 3/7/2011 676.60 Upper Galena-Platteville AR-6 5/7/2011 677.34 Upper Galena-Platteville AR-6 7/20/2011 675.26 Upper Galena-Platteville AR-6 11/2/2011 674.87 Upper Galena-Platteville AR-7 4/4/2006 765.96 Upper Galena-Platteville AR-7 4/27/2006 766.74 Upper Galena-Platteville AR-7 10/30/2006 768.42 Upper Galena-Platteville AR-7 4/15/2007 Not Measured Upper Galena-Platteville AR-7 6/2/2008 787.88 Upper Galena-Platteville AR-7 9/29/2008 786.38 Upper Galena-Platteville AR-7 10/1/2008 786.38 Upper Galena-Platteville AR-7 4/29/2009 793.61 Upper Galena-Platteville AR-7 10/13/2009 790.87 Upper Galena-Platteville AR-7 5/17/2010 791.71 Upper Galena-Platteville AR-7 10/21/2010 790.58 Upper Galena-Platteville AR-7 3/7/2011 781.11 Upper Galena-Platteville AR-7 5/9/2011 784.63 Upper Galena-Platteville AR-7 7/19/2011 787.14 Upper Galena-Platteville AR-7 11/2/2011 788.26 Upper Galena-Platteville AR-7 3/2/2012 781.82 Upper Galena-Platteviile AR-7 5/14/2012 782.14 Upper Galena-Platteville AR-7 8/20/2012 778.32 Upper Galena-Platteville AR-7 10/16/2012 776.00 Upper Galena-Platteville AR-7 3/18/2013 775.88 Upper Galena-Platteville Byron Change Tables (30 2013)Page 4 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR-7 5/22/2013 785.43 Upper Galena-Platteville AR-7 8/14/2013 782.48 Upper Galena-Platteville AR-8 4/4/2006 816.14 Upper Galena-Platteville AR-8 4/27/2006 838.55 Upper Galena-Platteville AR-8 10/30/2006 836.86 Upper Galena-Platteville AR-8 4/15/2007 Not Measured Upper Galena-Platteville AR-8 6/2/2008 848.56 Upper Galena-Platteville AR-8 9/29/2008 851.66 Upper Galena-Platteville AR-8 4/29/2009 Not Measured Upper Galena-Platteville AR-8 10/13/2009 851.76 Upper Galena-Platteville AR-8 5/17/2010 847.98 Upper Galena-Platteville AR-8 10/21/2010 847.71 Upper Galena-Platteville AR-8 3/7/2011 840.64 Upper Galena-Platteville AR-8 5/9/2011 842.76 Upper Galena-Platteville AR-8 7/19/2011 844.45 Upper Galena-Platteville AR-8 11/2/2011 845.01 Upper Galena-Platteville AR-8 3/6/2012 839.10 Upper Galena-Platteville AR-8 5/14/2012 839.24 Upper Galena-Platteville AR-8 8/20/2012 835.79 Upper Galena-Platteville AR-8 10/16/2012 833.30 Upper Galena-Platteville AR-8 3/18/2013 835.11 Upper Galena-Platteville AR-8 5/22/2013 843.20 Upper Galena-Platteville AR-8 8/14/2013 840.61 Upper Galena-Platteville AR-9 4/27/2006 850.40 Upper Galena-Platteville AR-9 10/30/2006 819.21 Upper Galena-Platteville AR-9 4/20/2007 Not Measured Upper Galena-Platteville AR-9 6/2/2008 830.88 Upper Galena-Platteville AR-9 9/29/2008 831.12 Upper Galena-Platteville AR-9 10/1/2008 831.12 Upper Galena-Platteville AR-9 4/29/2009 832.26 Upper Galena-Platteville AR-9 10/13/2009 833.11 Upper Galena-Platteville AR-9 5/17/2010 832.42 Upper Galena-Platteville AR-9 10/22/2010 832.63 Upper Galena-Platteville AR-9 3/7/2011 827.92 Upper Galena-Platteville AR-9 5/9/2011 830.39 Upper Galena-Platteville AR-9 7/19/2011 832.94 Upper Galena-Platteville AR-9 11/2/2011 829.95 Upper Galena-Platteville AR-9 3/6/2012 828.75 Upper Galena-Platteville AR-9 5/14/2012 828.95 Upper Galena-Platteville AR-9 8/20/2012 826.91 Upper Galena-Platteville AR-9 10/16/2012 825.42 Upper Galena-Platteville AR-9 3/18/2013 837.15 Upper Galena-Platteville AR-9 5/22/2013 833.55 Upper Galena-Platteville AR-9 8/14/2013 830.44 Upper Galena-Platteville CAR-2 3/23/2006 736.50 Upper Galena-Platteville CAR-2 4/4/2006 742.56 Upper Galena-Platteville CAR-2 4/27/2006 736.89 Upper Galena-Platteville CAR-2 11/2/2006 736.69 Upper Galena-Platteville CAR-2 4/20/2007 Not Measured Upper Galena-Platteville CAR-2 10/8/2007 735.43 Upper Galena-Platteville CAR-2 5/28/2008 736.81 Upper Galena-Platteville CAR-2 9/29/2008 736.61 Upper Galena-Platteville CAR-2 4/28/2009 743.39 Upper Galena-Platteville CAR-2 10/14/2009 737.05 Upper Galena-Platteville CAR-2 5/17/2010 742.61 Upper Galena-Platteville CAR-2 10/21/2010 734.90 Upper Galena-Platteville CAR-2 3/7/2011 742.66 Upper Galena-Platteville CAR-2 5/7/2011 740.87 Upper Galena-Platteville CAR-2 7/20/2011 735.51 Upper Galena-Platteville Byron Change Tables (3Q 2013)Page 5 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer CAR-2 11/2/2011 735.17 Upper Galena-Platteville CAR-3 4/4/2006 824.62 Upper Galena-Platteville CAR-3 4/27/2006 826.52 Upper Galena-Platteville CAR-3 10/30/2006 828.33 Upper Galena-Platteville CAR-3 4/15/2007 Not Measured Upper Galena-Platteville CAR-3 6/2/2008 838.21 Upper Galena-Platteville CAR-3 9/29/2008 840.95 Upper Galena-Platteville CAR-3 10/1/2008 840.95 Upper Galena-Platteville CAR-3 4/29/2009 841.96 Upper Galena-Platteville CAR-3 10/13/2009 845.69 Upper Galena-Platteville CAR-3 5/17/2010 837.87 Upper Galena-Platteville CAR-3 10/21/2010 837.36 Upper Galena-Platteville CAR-3 3/7/2011 834.92 Upper Galena-Platteville CAR-3 5/9/2011 844.36 Upper Galena-Platteville CAR-3 7/19/2011 834.20 Upper Galena-Platteville CAR-3 11/2/2011 835.29 Upper Galena-Platteville CAR-3 3/6/2012 833.94 Upper Galena-Platteville CAR-3 5/14/2012 833.11 Upper Galena-Platteville CAR-3 8/20/2012 828.57 Upper Galena-Platteville CAR-3 10/16/2012 831.07 Upper Galena-Platteville CAR-3 3/18/2013 850.75 Upper Galena-Platteville CAR-3 5/22/2013 842.24 Upper Galena-Platteville CAR-3 8/14/2013 835.16 Upper Galena-Platteville DF-10 4/24/2006 Not Measured Upper Galena-Platteville DF-1 1 4/24/2006 749.00 Upper Galena-Platteville DF-15 3/23/2006 745.49 Upper Galena-Platteville DF-15 4/4/2006 740.47 Upper Galena-Platteville DF-15 4/24/2006 740.98 Upper Galena-Platteville DF-1 8 3/23/2006 724.68 Upper Galena-Platteville DF-18 4/4/2006 724.80 Upper Galena-Platteville OF-18 4/24/2006 725.72 Upper Galena-Platteville DF-19 3/23/2006 724.51 Upper Galena-Platteville DF-19 4/4/2006 724.63 Upper Galena-Platteville DF-19 4/25/2006 725.60 Upper Galena-Platteville DF-1 S 3/23/2006 724.97 Upper Galena-Platteville DF-1S 4/4/2006 725.09 Upper Galena-Platteville DF-1S 4/25/2006 726.04 Upper Galena-Platteville OF-22S 3/23/2006 735.86 Upper Galena-Platteville DF-22S 4/4/2006 725.99 Upper Galena-Platteville DF-22S 4/24/2006 726.34 Upper Galena-Platteville DF-24 3/23/2006 722.40 Upper Galena-Platteville DF-24 4/4/2006 722.57 Upper Galena-Platteville DF-24 4/26/2006 723.79 Upper Galena-Platteville DF-24 11/21/2006 721.58 Upper Galena-Platteville DF-24 4/19/2007 Not Measured Upper Galena-Platteville DF-24 10/10/2007 724.51 Upper Galena-Platteville DF-24 5/28/2008 732.78 Upper Galena-Platteville DF-24 9/29/2008 726.33 Upper Galena-Platteville DF-24 4/29/2009 739.28 Upper Galena-Platteville DF-24 10/14/2009 728.22 Upper Galena-Platteville DF-24 5/17/2010 733.98 Upper Galena-Platteville DF-24 10/21/2010 728.28 Upper Galena-Platteville 6F-24 3/7/2011 726.35 Upper Galena-Platteville DF-24 5/9/2011 730.36 Upper Galena-Platteville DF-24 7/20/2011 726.98 Upper Galena-Platteville DF-24 11/2/2011 724.86 Upper Galena-Platteville DF-24 3/7/2012 724.71 Upper Galena-Platteville DF-24 5/16/2012 724.95 Upper Galena-Platteville DF-24 8/15/2012 724.42 Upper Galena-Platteville Byron Change Tables (30 2013)Page 6 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer DF-24 10/17/2012 722.54 Upper Galena-Platteville DF-24 3/18/2013 725.17 Upper Galena-Platteville DF-24 5/22/2013 729.26 Upper Galena-Platteville DF-24 8/14/2013 726.07 Upper Galena-Platteville DF-2S 3/23/2006 725.48 Upper Galena-Platteville DF-2S 4/4/2006 725.96 Upper Galena-Platteville DF-2S 4/25/2006 727.08 Upper Galena-Platteville DF-3S 3/23/2006 726.28 Upper Galena-Platteville DF-3S 4/4/2006 726.36 Upper Galena-Platteville DF-3S 4/25/2006 727.33 Upper Galena-Platteville DF-4DS 4/25/2006 765.82 Upper Galena-Platteville DF-5S 4/24/2006 799.77 Upper Galena-Platteville GW-9 4/28/2006 745.46 Upper Galena-Platteville GW-9 11/21/2006 749.73 Upper Galena-Platteville GW-9 4/21/2007 Not Measured Upper Galena-Platteville GW-9 10/10/2007 752.23 Upper Galena-Platteville GW-9 5/29/2008 761.88 Upper Galena-Platteville GW-9 5/29/2008 761.88 Upper Galena-Platteville GW-9 9/29/2008 748.23 Upper Galena-Platteville GW-9 4/28/2009 758.93 Upper Galena-Platteville GW-9 10/14/2009 760.63 Upper Galena-Platteville GW-9 5/17/2010 760.33 Upper Galena-Platteville GW-9 10/21/2010 743.58 Upper Galena-Platteville GW-9 3/9/2011 754.81 Upper Galena-Platteville GW-9 5/10/2011 755.97 Upper Galena-Platteville GW-9 7/20/2011 753.17 Upper Galena-Platteville GW-9 11/2/2011 754.86 Upper Galena-Platteville MW-i 3/23/2006 799.95 Upper Galena-Platteville MW-i 4/4/2006 800.76 Upper Galena-Platteville MW-i 4/26/2006 799.63 Upper Galena-Platteville MW-i 11/1/2006 798.62 Upper Galena-Platteville MW-i 4/19/2007 Not Measured Upper Galena-Platteville MW-i 10/8/2007 804.27 Upper Galena-Platteville MW-i 5/29/2008 812.12 Upper Galena-Platteville MW-i 9/29/2008 808.42 Upper Galena-Platteville MW-i 4/28/2009 819.37 Upper Galena-Platteville MW-i 10/14/2009 812.05 Upper Galena-Platteville MW-i 5/17/2010 Not Measured Upper Galena-Platteville MW-i 10/21/2010 814.17 Upper Galena-Platteville MW-i 3/7/2011 807.40 Upper Galena-Platteville MW-i 5/7/2011 808.37 Upper Galena-Platteville MW-i 7/20/2011 Not Accessible Upper Galena-Platteville MW-i 11/2/2011 Not Measured Upper Galena-Platteville MW-i 3/7/2012 806.45 Upper Galena-Platteville MW-i 5/16/2012 806.57 Upper Galena-Platteville MW-i 8/15/2012 807.70 Upper Galena-Platteville MW-i 10/17/2012 807.66 Upper Galena-Platteville MW-i 3/18/2013 803.34 Upper Galena-Platteville MW-1 5/22/2013 805.50 Upper Galena-Platteville MW-i 8/14/2013 804.74 Upper Galena-Platteville MW-15 3/23/2006 743.98 Upper Galena-Platteville MW-15 4/4/2006 744.21 Upper Galena-Platteville MW-15 4/24/2006 745.56 Upper Galena-Platteville MW-3 4/26/2006 787.51 Upper Galena-Platteville MW-3 11/1/2006 786.00 Upper Galena-Platteville MW-3 4/19/2007 Not Measured Upper Galena-Platteville MW-3 10/8/2007 789.27 Upper Galena-Platteville MW-3 5/29/2008 790.45 Upper Galena-Platteville MW-3 9/29/2008 Dry Upper Galena-Platteville Byron Change Tables (3Q 2013)Page 7 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer MW-3 4/28/2009 791.15 Upper Galena-Platteville MW-3 10/14/2009 798.65 Upper Galena-Platteville MW-3 5/17/2010 Not Measured Upper Galena-Platteviile MW-3 10/21/2010 789.74 Upper Galena-Platteville MW-3 3/7/2011 788.99 Upper GalenaPlatteville MW-3 5/7/2011 790.19 Upper Galena-Platteville MW-3 7/20/2011 790.08 Upper Galena-Platteville MW-3 11/2/2011 789.15 Upper Galena-Platteville MW-3 3/7/2012 788.48 Upper Galena-Platteville MW-3 5/16/2012 788.51 Upper Galena-Platteville MW-3 8/15/2012 788.74 Upper Galena-Platteville MW-3 10/17/2012 788.55 Upper Galena-Platteville MW-3 3/18/2013 786.48 Upper Galena-Platteville MW-3 5/22/2013 786.74 Upper Galena-Platteville MW-3 8/14/2013 788.18 Upper Galena-Platteville MW-30 3/23/2006 720.41 Upper Galena-Platteville MW-30 4/28/2006 720.26 Upper Galena-Platteville PC-1B 3/23/2006 717.21 Upper Galena-Platteville PC-1 B 4/4/2006 717.25 Upper Galena-Platteville PC-1 B 4/26/2006 718.01 Upper Galena-Platteville PC-2B 4/4/2006 756.28 Upper Galena-Platteville PC-2B 4/25/2006 756.23 Upper Galena-Platteville PC-3B 4/24/2006 760.58 Upper Galena-Platteville PC-.4B 3/23/2006 726.15 Upper Galena-Platteville PC-4B 4/4/2006 726.27 Upper Galena-Platteville PC-4B 4/24/2006 726.49 Upper Galena-Platteville PC-5B 3/23/2006 722.91 Upper Galena-Platteville PC-5B 4/4/2006 722.47 Upper Galena-Platteville PC-5B 4/26/2006 723.60 Upper Galena-Platteville PC-6B 3/23/2006 749.82 Upper Galena-Platteville PC-6B 4/4/2006 740.58 Upper Galena-Platteville PC-6B 4126/2006 743.18 Upper Galena-Platteville WELL-7 4/27/2006 775.47 Upper Galena-Platteville WELL-7 11/21/2006 784.24 Upper Galena-Platteville WELL-7 10/10/2007 789.24 Upper Galena-Platteville WELL-7 5/29/2008 803.94 Upper Galena-Platteville WELL-7 9/29/2008 784.74 Upper Galena-Platteville WELL-7 4/28/2009 805.04 Upper Galena-Platteville WELL-7 10/14/2009 809.92 Upper Galena-Platteville WELL-7 5/17/2010 808.64 Upper Galena-Platteville WELL-7 10/21/2010 803.79 Upper Galena-Platteville WELL-7 3/7/2011 810.34 Upper Galena-Platteville WELL-7 5/7/2011 810.09 Upper Galena-Platteville WELL-7 7/20/2011 805.48 Upper Galena-Platteville WELL-7 11/2/2011 801.82 Upper Galena-Platteville WELL-7 3/7/2012 793.58 Upper Galena-Platteville WELL-7 5/16/2012 801.59 Upper Galena-Platteville WELL-7 8/15/2012 790.65 Upper Galena-Platteville WELL-7 10/17/2012 808.52 Upper Galena-Platteville WELL-7 3/18/2013 809.81 Upper Galena-Platteville WELL-7 5/22/2013 794.95 Upper Galena-Platteville WELL-7 8/14/2013 793.56 Upper Galena-Platteville AR-11 4/26/2006 742.41 Lower Galena-Platteville AR- 1l 11/21/2006 732.75 Lower Galena-Platteville AR-11 4/23/2007 Not Measured Lower Galena-Platteville AR- 1 10/10/2007 721.23 Lower Galena-Platteville AR-1l 5/28/2008 744.80 Lower Galena-Platteville AR-1l 9/29/2008 741.70 Lower Galena-Platteville AR-i1 1 4/29/2009 748.59 Lower Galena-Platteville Byron Change Tables (30 2013)Page 8 of 10 AMO Environmental Decisions

-Byron Generating Station Exelon Corporation Appendix B Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer AR- 1 10/15/2009 742.47 Lower Galena-Platteville AR-11 5/17/2010 747.35 Lower Galena-Platteville AR-i1 10/21/2010 743.30 Lower Galena-Platteville AR-11 3/7/2011 742.80 Lower Galena-Platteville AR-1 1 5/9/2011 747.64 Lower Galena-Platteville AR-1 1 7/20/2011 744.43 Lower Galena-Platteville AR-11 11/2/2011 744.78 Lower Galena-Platteville AR-1l 3/7/2012 744.88 Lower Galena-Platteville AR-1 1 5/16/2012 745.74 Lower Galena-Platteville AR-1 1 8/15/2012 743.05 Lower Galena-Platteville AR- 1 10/17/2012 742.03 Lower Galena-Platteville AR- 1 3/18/2013 742.34 Lower Galena-Platteville AR-11 5/22/2013 747.47 Lower Galena-Platteville AR- 1 8/14/2013 744.62 Lower Galena-Platteville DF-12 3/23/2006 744.35 Lower Galena-Platteville DF-12 4/25/2006 746.06 Lower Galena-Platteville DF-13 3/23/2006 744.39 Lower Galena-Platteville DF-13 4/4/2006 744.68 Lower Galena-Platteville DF-13 4/26/2006 746.06 Lower Galena-Platteville DF-17 3/23/2006 729.14 Lower Galena-Platteville DF-17 4/4/2006 729.27 Lower Galena-Platteville DF-17 4/24/2006 729.76 Lower Galena-Platteville DF-1 D 3/23/2006 724.56 Lower Galena-Platteville DF-i D 4/4/2006 724.73 Lower Galena-Platteville DF-D 4/25/2006 725.67 Lower Galena-Platteville DF-22D 3/23/2006 725.78 Lower Galena-Platteville DF-22D 4/24/2006 726.34 Lower Galena-Platteville DF-23 3/23/2006 726.66 Lower Galena-Platteville DF-23 4/4/2006 695.37 Lower Galena-Platteville DF-23 4/24/2006 717.17 Lower Galena-Platteville DF-4DD 3/23/2006 744.49 Lower Galena-Platteville DF-4DD 4/4/2006 744.78 Lower Galena-Platteville DF-4DD 4/24/2006 746.17 Lower Galena-Platteville DF-6 3/23/2006 737.18 Lower Galena-Platteville DF-6 4/4/2006 738.17 Lower Galena-Platteville 6F-6 4/25/2006 739.20 Lower Galena-Platteville DF-8 3/23/2006 716.90 Lower Galena-Platteville DF-8 4/4/2006 717.00 Lower Galena-Platteville DF-8 4/24/2006 717.60 Lower Galena-Platteville MW-16 3/23/2006 743.93 Lower Galena-Platteville MW-16 4/4/2006 744.19 Lower Galena-Platteville MW-16 4/24/2006 745.56 Lower Galena-Platteville MW-36 3/23/2006 744.47 Lower Galena-Platteville MW-36 4/4/2006 744.73 Lower Galena-Platteville MW-36 4/25/2006 746.14 Lower Galena-Platteville MW-41 3/23/2006 743.85 Lower Galena-Platteville MW-41 4/4/2006 744.13 Lower Galena-Platteville MW-41 4/24/2006 745.49 Lower Galena-Platteville MW-42 3/23/2006 744.14 Lower Galena-Platteville MW-42 4/4/2006 744.47 Lower Galena-Platteville MW-42 4/24/2006 745.85 Lower Galena-Platteville MW-2 3/23/2006 683.62 St. Peter Sandstone MW-2 4/4/2006 684.18 St. Peter Sandstone MW-2 4/27/2006 684.22 St. Peter Sandstone MW-20R 3/23/2006 680.65 St. Peter Sandstone MW-20R 4/4/2006 680.73 St. Peter Sandstone MW-20R 4/24/2006 681.19 St. Peter Sandstone MW-21 3/23/2006 680.58 St. Peter Sandstone MW-21 4/4/2006 680.70 St. Peter Sandstone Byron Change Tables (30 2013)Page 9 of 10 AMO Environmental Decisions Byron Generating Station Exelon Corporation Appendix B -Summary of Groundwater Elevations Groundwater Sample Location Sample Date Elevation Aquifer MW-21 4/24/2006 681.16 St. Peter Sandstone MW-37 3/23/2006 681.61 St. Peter Sandstone MW-37 4/4/2006 681.73 St. Peter Sandstone MW-37 4/26/2006 682.15 St. Peter Sandstone MW-39 3/23/2006 680.94 St. Peter Sandstone MW-39 4/4/2006 681.06 St. Peter Sandstone MW-39 4/26/2006 681.49 St. Peter Sandstone PC-1C 3/23/2006 678.99 St. Peter Sandstone PC-1C 4/4/2006 678.99 St. Peter Sandstone PC-1C 4/26/2006 679.53 St. Peter Sandstone DF-25 4/24/2006 769.11 Unknown DF-9S 3/23/2006 685.80 Unknown DF-9S 4/4/2006 686.08 Unknown MS-1 3/23/2006 694.03 Unknown MS-1 4/4/2006 693.34 Unknown MS-2 3/23/2006 676.91 Unknown MS-2 4/4/2006 676.78 Unknown MW-11 4/4/2006 713.67 Unknown MW-121 3/23/2006 704.92 Unknown MW-121 4/4/2006 704.90 Unknown MW12S 3/23/2006 704.45 Unknown MW12S 4/4/2006 706.29 Unknown OS-NW-1D 3/23/2006 676.20 Unknown OS-NW-1D 4/4/2006 743.12 Unknown OS-NW-1S 3/23/2006 742.60 Unknown OS-NW-1S 4/4/2006 774.16 Unknown OS-SW-1 3/23/2006 669.94 Unknown OS-SW-1 4/4/2006 678.43 Unknown OS-SW-2D 3/23/2006 679.76 Unknown OS-SW-2D 4/4/2006 679.89 Unknown OS-SW-21 3/23/2006 679.88 Unknown OS-SW-21 4/4/2006 680.00 Unknown OS-SW-2S 3/23/2006 684.51 Unknown OS-SW-2S 4/4/2006 685.06 Unknown OS-SW-3D 3/23/2006 682.52 Unknown OS-SW-3D 4/4/2006 659.12 Unknown OS-SW-3S 3/23/2006 695.82 Unknown OS-SW-3S 4/4/2006 673.83 Unknown RR-10 4/4/2006 672.17 Unknown RR-9 3/23/2006 670.92 Unknown RR-9 4/4/2006 671.05 Unknown All Elevations Presented In Feet Above Mean Sea Level Byron Change Tables (3Q 2013)Page 10 of 10 AMO Environmental Decisions

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