RA09-042, 2008 Annual Radiological Environmental Operating Report

2008 Annual Radiological Environmental Operating Report

ML091350485
Person / Time
Site:	LaSalle
Issue date:	05/15/2009
From:	Wozniak D Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
FOIA/PA-2010-0209, RA09-042
Download: ML091350485 (191)

Text

Exelon Generation Company, LLC www.exeloncorp.com LaSalle County Station Nuclear 2601 North 21,1Road Marseilles, IL 61341-9757 RA09-042 10 CFR 50 Appendix I May 15, 2009 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-1 1 and NPF-1 8 NRC Docket Nos. 50-373 and 50-374

Subject:

2008 Annual Radiological Environmental Operating Report Enclosed is the Exelon Generation Company, LLC, LaSalle County Station 2008 Annual Radiological Environmental Operating Report, submitted in accordance with Technical Specification 5.6.2, "Annual Radiological Environmental Operating Report." This report contains the results of the Radiological Environmental and Meteorological Monitoring Programs. This report is enclosed as an attachment.

In addition, this attachment contains the results of groundwater monitoring conducted in accordance with Exelon's Radiological Groundwater Protection Program, which is a voluntary program implemented in 2006. This information is being reported in accordance with a nuclear industry initiative.

Should you have any questions concerning this letter, please contact Mr. Terrence W. Simpkin, Regulatory Assurance Manager, at (815) 415-2800.

Respectfully, David B. Wozniak Site Vice President LaSalle County Station Attachment cc: Regional Administrator - NRC Region ill NRC Senior Resident Inspector - LaSalle County Station

Docket No: 50-373 50-374 LASALLE COUNTY STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2008 Prepared By Teledyne Brown Engineering Environmental Services SM Nuclear LaSalle County Station Marseilles, IL 61341 May 2009 1 of 190

Table Of Contents

1. Summary and Conclusions ................................................................................................ 1 II. Introduction ........................................................................................................................ 2 A. Objectives of the REMP ........................................................................................ 2 B. Implementation of the Objectives .......................................................................... 2 III. Program Description ......................................................................................................... 2 A. Sample Collection .................................................................................................. 2 B. Sample Analysis .................................................................................................... 4 C. Data Interpretation ................................................................................................. 5 D. Program Exceptions .............................................................................................. 6 E. Program Changes ................................................................................................. 8 IV. Results and Discussion ................................................................................................... 8 A. Aquatic Environment ............................................................................................. 8

1. Surface Water ............................................................................................. 8

2. Ground/well Water ...................................................................................... 9

3. Fish ............................................................................................................. 9

4. Sediment ................................................................................................... 10 B. Atmospheric Environment ...................................................................................10

1. Airborne .................................................................................................... 10

a. Air Particulates .............................................................................. 10

b. Airborne Iodine .............................................................................. 11

2. Terrestrial .................................................................................................. 11

a. Milk ................................................................................................ 11

b. Food Products ............................................................................... 12 C. Ambient Gamma Radiation ................................................................................. 12 D. Land Use Survey ................................................................................................. 12 E. Summary of Results - Inter-laboratory Comparison Program ............................ 13 i

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Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Summary for the LaSalle County Station, 2008 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2008 Table B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2008 Figures Figure B-1: Inner Ring TLD Locations of the LaSalle County Station, 2008 Figure B-2: Outer Ring TLD Locations of the LaSalle County Station, 2008 Figure B-3: Fixed Air Sampling Locations of the LaSalle County Station, 2008 Figure B-4: Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2008 Appendix C Data Tables and Figures - Primary Laboratory Tables Table C-1.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-11.1 Concentrations of Tritium in Ground/well Water Samples Collected in the Vicinity of LaSalle County Station, 2008 ii 3 of 190

Table C-11.2 Concentrations of Gamma Emitters in Ground/well Water Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-111.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-V.2 Monthly and Yearly Mean Values of Gross Beta Concentrations (E-3 pCi/cu meter) in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-VI.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-VI1.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-V111.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table C-IX.1 Quarterly TLD Results for LaSalle County Station, 2008.

Table C-IX.2 Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Other and Control Locations for LaSalle County Station, 2008.

Table C-IX.3 Summary of the Ambient Dosimetry Program for LaSalle County Station, 2008.

Figures Figure C-1 Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LCS, 2000 - 2008.

Figure C-2 Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LCS, 2000 - 2008.

Figure C-3 Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LCS, 2000 - 2008.

Figure C-4 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LCS, 2000 - 2008.

Figure C-5 Air Particulate - Gross Beta - Station L-10 (C) Collected in the Vicinity of LCS, 2000 - 2008.

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Figure C-6 Air Particulate - Gross Beta - Station L-04 and L-07 Collected in the Vicinity of LCS, 2008.

Figure C-7 Air Particulate - Gross Beta - Station L-08 and L-1 1 Collected in the Vicinity of LCS, 2008.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2008 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2008 Table D-3 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2008 Table D-4 ERA Statistical Summary Proficiency Testing Program Environmental, Inc., 2008 Table D-5 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Environmental, Inc., 2008 Appendix E Effluent Data Appendix F Meteorological Data Appendix G Annual Radiological Groundwater Protection Program Report (ARGPPR) iv 5 of 190

Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the LaSalle County Station (LCS) by Exelon covers the period 1 January 2008 through 31 December 2008. During that time period, 1,451 analyses were performed on 1,351 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of LCS had no adverse radiological impact on the environment.

Surface water samples were analyzed for concentrations of gross beta, tritium and gamma emitting nuclides. Ground/well water samples were analyzed for concentrations of tritium and gamma emitting nuclides. No fission or activation products were detected. Gross beta and tritium activities detected were consistent with those detected in previous years.

Fish (commercially and recreationally important species) and sediment samples were analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected in fish or sediment. Sediment samples had Cs-137 concentrations consistent with levels observed during the preoperational years. No plant produced fission or activation products were found in sediment.

Air particulate samples were analyzed for concentrations of gross beta and gamma emitting nuclides. No fission or activation products were detected.

High sensitivity 1-131 analyses were performed on weekly air samples. All results were less than the minimum detectable activity.

Cow milk samples were analyzed for concentrations of 1-131 and gamma emitting nuclides. All 1-131 results were below the minimum detectable activity.

Concentrations of naturally occurring K-40 were consistent with those detected in previous years. No fission or activation products were found.

Food product samples were analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected.

Environmental gamma radiation measurements were performed quarterly using thermoluminescent dosimeters. Levels detected were consistent with those observed in previous years.

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II. Introduction The LaSalle County Station (LCS), consisting of two boiling water reactors, each rated for 3489 MWt, owned and operated by Exelon Corporation, is located in LaSalle County, Illinois. Unit No. 1 went critical on 16 March 1982. Unit No. 2 went critical on 02 December 1983. The site is located in northern Illinois, approximately 75 miles southwest of Chicago, Illinois.

A Radiological Environmental Monitoring Program (REMP) for LCS was initiated in 1982. (The preoperational period for most media covers the periods 1 January 1979 through 26 December 1981 and was summarized in a separate report.)

This report covers those analyses performed by Teledyne Brown Engineering (TBE), Global Dosimetry, and Environmental Inc. (Midwest Labs) on samples collected during the period 1 January 2008 through 31 December 2008.

A. Objective of the REMP The objectives of the REMP are to:

1. Provide data on measurable levels of radiation and radioactive materials in the site environs.

2. Evaluate the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure.

B. Implementation of the Objectives The implementation of the objectives is accomplished by:

1. Identifying significant exposure pathways.

2. Establishing baseline radiological data of media within those pathways.

3. Continuously monitoring those media before and during Station operation to assess Station radiological effects (if any) on man and the environment.

III. Program Description A. Sample Collection Samples for the LCS REMP were collected for Exelon Nuclear by 7 of 190

Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. (Midwest Labs) to obtain environmental samples for the LCS REMP in 2008. Sample locations and descriptions can be found in Tables B-1 and B-2, and Figures B-1 through B-4, Appendix B.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, ground/well water, fish, and sediment. Two gallon water samples were collected weekly from two surface water locations (L-21 and L-40) and composited for monthly and quarterly required analyses. Control location was L-21. Two ground/well water locations (L-27 and L-28) were also grab sampled quarterly. All samples were collected in new unused plastic bottles, which were rinsed with source water prior to collection. Fish samples comprising the flesh of channel catfish, freshwater drum, largemouth bass, and smallmouth buffalo were collected semiannually at three locations, L-34, L-35 and L-36 (Control). Sediment samples composed of recently deposited substrate were collected at three locations semiannually, L-21 (Control), L-40 and L-41.

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, milk and food products. Airborne iodine and particulate samples were collected and analyzed weekly at nine locations (L-01, L-03, L-04, L-05, L-06, L-07, L-08, L-10 and L-11). The control location was L-10. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air filters and air iodine samples were replaced weekly and sent to the laboratory for analysis.

Milk samples were collected biweekly at one location (L-42) from May through October, and monthly from November through April. The control location was L-42. All samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite, and shipped promptly to the laboratory.

Food products were collected annually in September at five locations (L-Quad C, L-Quad 1, L-Quad 2, L-Quad 3, and L-Quad 4). The control location was L-Quad C. Various types of samples were collected and placed in new unused plastic bags, and sent to the laboratory for analysis.

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Ambient Gamma Radiation Direct radiation measurements were made using CaF2 thermoluminescent dosimeters (TLD). Each location consisted of 2 TLD sets. The TLD locations were placed on and around the LCS site as follows:

An inner ring consisting of 16 locations (L-1 01, L-102, L-1 03, L-1 04, L-105, L-106, L-107, L-108, L-109, L-110, L-111 B, L-112, L-113A, L-114, L-1 15 and L-1 16) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from LCS release.

An outer ring consisting of 16 locations (L-201, L-202, L-203, L-204, L-205, L-206, L-207, L-208, L-209, L-210, L-211, L-212, L-213, L-214, L-215 and L-216) extending to approximately 5 miles from the site designed to measure possible exposures to close-in population.

An other set consisting of eight locations (L-01, L-03, L-04, L-05, L-06, L-07, L-08 and L-11).

The balance of one location (L-10) representing the control area.

The specific TLD locations were determined by the following criteria:

1. The presence of relatively dense population;

2. Site meteorological data taking into account distance and elevation for each of the sixteen -22 1/2 degree sectors around the site, where estimated annual dose from LCS, if any, would be most significant;

3. On hills free from local obstructions and within sight of the vents (where practical);

4. And near the closest dwelling to the vents in the prevailing downwind direction.

(Two TLDs - each comprised of two CaF2 thermoluminescent phosphors enclosed in plastic - were placed at each location approximately six feet above ground level. The TLDs were exchanged quarterly and sent to Global Dosimetry for analysis.)

B. Sample Analysis This section describes the general analytical methodologies used by TBE and Environmental Inc (Midwest Labs) to analyze the environmental 9 of 190

samples for radioactivity for the LCS REMP in 2008. The analytical procedures used by the laboratories are listed in Table B-2.

In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of beta emitters in surface water and air particulates.

2. Concentrations of gamma emitters in ground/well and surface water, air particulates, milk, fish, sediment and vegetation.

3. Concentrations of tritium in ground/well and surface water.

4. Concentrations of 1-131 in air and milk.

5. Ambient gamma radiation levels at various site environs.

C. Data Interpretation The radiological and direct radiation data collected prior to LaSalle County Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, LaSalle County Station was considered operational at initial criticality. In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:

1. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) was defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD was intended as a before the fact estimate of a system (including instrumentation, procedure and sample type) and not as an after the fact criteria for the presence of activity. All analyses were designed to achieve the required LCS detection capabilities for environmental sample analysis.

The minimum detectable concentration (MDC) is defined above with the exception that the measurement is an after the fact estimate of the presence of activity.

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2. Net Activity Calculation and Reporting of Results Net activity for a sample was calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity effecting a negative number. An MDC was reported in all cases where positive activity was not detected.

Gamma spectroscopy results for each type of sample were grouped as follows:

For surface water and food product 12 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Zr-95, Nb-95, 1-131, Cs-134, Cs-137, Ba-140, and La-140 were reported.

For ground/well water, fish, sediment, air particulate and milk 11 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Zr-95, Nb-95, Cs-134, Cs-137, Ba-140, and La-140 were reported.

Means and standard deviations of the results were calculated. The standard deviations represent the variability of measured results for different samples rather than single analysis uncertainty.

D. Program Exceptions For 2008 the LCS REMP had a sample recovery rate in excess of 99%.

Sample anomalies and missed samples are listed in the tables below:

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date A/I L-03 05/01/08 Low timer reading of 158.9; possibly due to work on the lines in area.

All L-05 05/01/08 Low timer reading of 93.6; hours due to power outage.

All L-05 05//15/08 Low timer reading of 49.8; hours due to recent power restoration.

A/I L-04 09/04/08 Low reading of 166.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />; possibly due to storms in the area

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Table D-1 LISTING OF SAMPLE ANOMALIES (continued)

Sample Location Collection Reason Type Code Date A/I L-05 09/04/08 Low reading of 165.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; possibly due to storms in the area.

A/I L-06 09/04/08 Low reading of 165.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; possibly due to storms in area.

A/I L-07 09/04/08 Low reading of 167.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to storms in the area.

All L-08 09/04/08 Low reading of 167.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to storms in the area.

A/I L-03 09/11/08 No electricity; station notified; estimated flowrate of 60 cfh.

A/I L-03 09/ 18/08 Low reading of 23 .4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; due to recent power restoration.

WWI L-28 10/08/08 No one available to open pump house; sample collected 10/16/08.

A/I L-05 12/04/08 Eight-day collection period; low reading of 191.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />; possibly due to power outages in the area.

A/I L-07 12/04/08 Eight-day collection period; low reading of 191.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to power outages in the area.

A/I L-08 12/04/08 Eight-day collection period; low reading of 191.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />; possibly due to power outages in the area.

A/I L-10 12/24/08 Low reading of 135.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to power failure.

A/I L-11 12/31/08 No electricity, breaker off; collector reset breaker.

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Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date A/I L-05 05/07/08 No sample; power out.

TLD L-106-2 07/01/08 Element damaged, could not be reprocessed.

Each program exception was reviewed to understand the causes of the program exception. Occasional equipment breakdowns and power outages were unavoidable.

The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.

E. Program Changes There were no program changes in 2008.

IV. Results and Discussion A. Aquatic Environment

1. Surface Water Samples were taken weekly and composited monthly at two locations (L-21 and L-40). Of these locations only L-40 located downstream, could be affected by LaSalle's effluent releases. The following analyses were performed.

Gross Beta Samples from all locations were analyzed for concentrations of gross beta (Table C-1.1, Appendix C). Gross beta was detected in all samples with a range of 4.6 to 10.5 pCi/1. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C). The required LLD was met.

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium was detected in 13 of 190

five of eight samples with a range of 127 to 332 pCi/I.

Concentrations detected were consistent with those detected in previous years (Figure C-2, Appendix C). The 2000 pCi/L OCDM and contractually required 200 pCi/L LLDs were met.

Gamma Spectrometry Samples from both locations were analyzed for gamma emitting nuclides (Table C-1.3, Appendix C). No nuclides were detected, and all required LLDs were met.

2. Ground/well Water Quarterly grab samples were collected at two locations (L-27 and L-28). Wells 4, 5, 6 are associated with L-28. L-27 and L-28 well 6 could be affected by LaSalle's effluent releases. The following analyses were performed:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-11.1, Appendix C). No tritium was detected and the 2000 pCi/L OCDM and contractually required 200 pCi/L LLDs were met.

Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-11.2, Appendix C). No nuclides were detected, and all required LLDs were met.

3. Fish Fish samples comprised of channel catfish, freshwater drum, largemouth bass, and smallmouth buffalo were collected at three locations (L-34, L-35 and L-36) semiannually. Locations L-34 and L-35 could be affected by LaSalle's effluent releases. The following analysis was performed:

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma emitting nuclides (Table C-111.1, Appendix C).

Naturally occurring K-40 was found at all stations and ranged from 2,380 to 3,340 pCi/kg wet. No fission or activation products were 14 of 190

found.

4. Sediment Aquatic sediment samples were collected at three locations (L-21, L-40 and L-41) semiannually. Locations L-40 and L-41, located downstream, could be affected by LaSalle's effluent releases. The following analysis was performed:

Gamma Spectrometry Sediment samples from both locations were analyzed for gamma emitting nuclides (Table C-IV.1, Appendix C). Nuclides detected were naturally occurring K-40 and Cs-137.

Potassium-40 was found at all stations and ranged from 7,890 to 16,500 pCi /kg dry. Cs-137 was found in two samples with a range of 77 to 83 pCi/kg dry. The activity detected was consistent with those detected in previous years and is likely due to fallout from above-ground nuclear weapons testing. No LaSalle fission or activation products were found.

B. Atmospheric Environment

1. Airborne

a. Air Particulates Continuous air particulate samples were collected from nine locations on a weekly basis. The nine locations were separated into four groups: Group I (onsite) represents locations within the LCS site boundary (L-03 and L-05),

Group II (near site) represents the locations near the LCS site (L-01 and L-06), Group I I I (far field) represents the control location at an intermediate distance from LCS (L-04, L-07, L-08 and L-11) and Group IV (Control) represents the control location at a remote distance (L-10). The following analyses were performed:

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-V.1 and C-V.2, Appendix C).

Detectable gross beta activity was observed at all locations.

Comparison of results among the four groups aid in 15 of 190

determining the effects, if any, resulting from the operation of LCS. The results from the OnSite locations (Group I) ranged from <5 to 45 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3.

The results from the near site location (Group 11) ranged from

<5 to 38 E-3 pCi/ms with a mean of 20 E-3 pCi/m3. The results from the far field locations (Group I11) ranged from

<37 to 45 E-3 pCi/m3 with a mean of 21 E-3 pCi/m3. The results from the Control location (Group IV) ranged from 6 to 41 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3. Comparison of the 2008 air particulate data with previous years data indicate no effects from the operation of LCS (Figures C-3 through C-7, Appendix C). In addition a comparison of the weekly mean values for 2008 indicate no notable differences among the three groups.

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma emitting nuclides (Table C-V.3, Appendix C).

Naturally occurring Be-7 due to cosmic ray activity was detected in 31 of 36 samples. These values ranged from 89 to 310 E-3 pCi/m3. Naturally occurring K-40 was not detected in any samples. All other nuclides were less than the MDC.

b. Airborne Iodine Continuous air samples were collected from nine locations (L-01, L-03, L-04, L-05, L-06, L-07, L-08, L-10, and L-11) and analyzed weekly for 1-131 (Table C-V1.1, Appendix C).

No nuclides were detected, and all required LLDs were met.

2. Terrestrial

a. Milk Samples were collected from one location (L-42) biweekly May through October and monthly November through April.

The following analyses were performed:

Iodine-131 Milk samples from the location were analyzed for concentrations of 1-131 (Table C-VI 1.1, Appendix C). No nuclides were detected, and all required LLDs were met.

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Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VI1.2, Appendix C).

Naturally occurring K-40 activity was found in all samples and ranged from 1,090 to 1,340 pCi/I. No other nuclides were detected, and all required LLDs were met.

b. Food Products Food product samples were collected at five locations (L-Quad C, L-Quad 1, L-Quad 2, L-Quad 3 and L-Quad 4) when available. Four locations, (L-Quad 1, L-Quad 2, L-Quad 3 and L-Quad 4) could be affected by LaSalle's effluent releases. The following analysis was performed:

Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-Vl ll.1, Appendix C). No nuclides were detected, and all required LLDs were met.

C. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Panasonic 814 (CaF2) thermoluminescent dosimeters. Forty-one TLD locations were established around the site. Results of TLD measurements are listed in Tables C-IX.1 to C-IX.3, Appendix C.

Most TLD measurements were below 30 mR/standard month, with a range of 18 to 32 mR/quarter. A comparison of the Inner Ring, Outer Ring, and Other data to the Control Location data, indicate that the ambient gamma radiation levels from the Control Location L-10 were comparable.

D. Land Use Survey A Land Use Survey conducted during the August 2008 growing season around the LaSalle County Station (LCS) was performed by Environmental Inc. (Midwest Labs) for Exelon Nuclear to comply with Radiological Effluent Control 12.5.2 of the LaSalle's Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident, milk producing animal and garden of greater than 500 ft2 in each of the sixteen 22 1/2 degree sectors around the site. The distance 17 of 190

and direction of all locations from the LCS reactor buildings were positioned using Global Positioning System (GPS) technology. There were no changes required to the LCS REMP, as a result of this survey.

The results of this survey are summarized below.

Distance in Miles from the LCS Reactor Buildings Sector Residence Livestock Milk Farm Miles Miles Miles AN 3.9 4.0 -

B NNE 1.6 1.7 -

C NE 2.1 3.5 -

D ENE 3.3 3.8 -

EE 3.2 - 12.6 F ESE 1.4 - -

G SE 1.7 4.7 -

H SSE 1.8 4.7 -

JS 1.5 4.7 -

K SSW 0.7 - -

L SW 1.0 5.8 -

M WSW 1.5 1.5 -

NW 1.5 3.0 -

PWNW 0.9 3.0 -

QNW 1.8 4.0 -

R NNW 1.7 4.6 -

E. Summary of Results - Inter-Laboratory Comparison Program The primary and secondary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation and water matrices (Appendix D). The PE samples, supplied by Analytics Inc.,

Environmental Resource Associates (ERA) and DOE's Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

1. Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of laboratory results and Analytics' known value. Since flag values are not assigned by Analytics, TBE-ES evaluates the reported ratios based on internal QC requirements, which are based on the DOE MAPEP criteria.

2. ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, NELAC, state specific PT 18 of 190

program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

3. DOE Evaluation Criteria MAPEP's evaluation report provides an acceptance range with associated flag values.

The MAPEP defines three levels of performance: Acceptable (flag =

"A"), Acceptable with Warning (flag = "W"), and Not Acceptable (flag = "N"). Performance is considered acceptable when a mean result for the specified analyte is +/- 20% of the reference value.

Performance is acceptable with warning when a mean result falls in the range from +/-20% to +/-30% of the reference value (i.e., 20% <

bias < 30%). If the bias is greater than 30%, the results are deemed not acceptable.

For the primary laboratory, 16 out of 18 analytes met the specified acceptance criteria. Two samples did not meet the specified acceptance criteria for the following reasons:

Teledyne Brown Engineering's Analytics December 2008 Sr-89 in milk result of 18.0 pCi/L was higher than the known value of 12.6 pCi/L, resulting in a found to known ratio of 1.43. NCR 09-02 was initiated to investigate this failure.

2. Teledyne Brown Engineering's Analytics' ERA Quik Response water sample January 2008 Sr-89 result of 37.33 pCi/L exceeded the upper acceptance limit of 25.2 pCi/L. No cause could be found for the failure. Studies bracketing these results, RAD 71 and RAD 72 had acceptable Sr-89 results. NCR 08-03 For the secondary laboratory, all of the 15 analytes met the specified acceptance criteria.

The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data.

19 of 190

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

20 of 190

TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SURFACE WATER GR-B 24 4 7.5 7.3 7.5 L-40 INDICATOR 0 (PCI/LITER) (12/12) (12/12) (12/12) ILLINOIS RIVER - DOWNSTREAM (4.7/10.5) (4.6/9.9) (4.7/10.5) 5.2 MILES NNW OF SITE 14-3 8 200 214 214 214 L-21 CONTROL 0 (2/4) (3/4) (3/4) ILLINOIS RIVER AT SENECA - UPSTREAM (181/246) (127/332) (127/332) 4.0 MILES NE OF SITE GAMMA 24 MN-54 15 <LLD <LLD 0 CO-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 CO-60 15 <LLD <LLD 0 ZN-65 30 <LLD <LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-l RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SURFACE WATER NB-95 15 <LLD <LLD 0 (PCI/LITER)

ZR-95 30 <LLD <LLD 0 1-131 15 <LLD <LLD 0 CS-134 15 <LLD <LLD 0 CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 LA-140 15 <LLD <LLD 0 GROUND WATER H-3 12 200 <LLD <LLD 0 (PC]/LITER)

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS GROUND WATER GAMMA 12 (PCI/LITER) MN-54 15 <LLD <LLD 0 CO-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 CO-60 15 <LLD <LLD 0 ZN-65 30 <LLD <LLD 0 NB-95 15 <LLD <LLD 0 ZR-95 30 <LLD <LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS GROUND WATER CS-134 15 <LLD <LLD 0 (PCI/LITER)

CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 LA-140 15 <LLD <LLD 0 FISH GAMMA 12 (PCI/KG WET) MN-54 130 <LLD <LLD 0 CO-58 130 <LLD <LLD 0 FE-59 260 <LLD <LLD 0

• THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS FISH CO-60 130 <LLD <LLD 0 (PCI/KG WET)

ZN-65 260 <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 CS-134 130 <LLD <LLD - 0 CS-137 150 <LLD <LLD - 0 BA-140 NA <LLD <LLD - 0 LA-140 NA <LLD <LLD - 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SEDIMENT GAMMA 6 (PCI/KG DRY) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SEDIMENT CS-134 150 <LLD <LLD 0 (PCI/KG DRY)

CS-137 180 80 <LLD 80 L-41 INDICATOR 0 (2/4) (2/2) ILLINOIS RIVER - DOWNSTREAM (77/83) (77/83) 4.6 MILES NNW OF SITE BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 AIR PARTICULATE GR-B 466 10 20 20 21 L-08 INDICATOR 0 (E-3 PCI/CU.METER) (410/414) (52/52) (52/52) MARSEILLES (6/45) (6/41) (6/42) 6.0 MILES NNW OF SITE GAMMA 36 MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS AIR PARTICULATE FE-59 NA <LLD <LLD 0 (E-3 PCI/CU.METER)

CO-60 NA <LLD <LLD - 0 ZN-65 NA <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 CS-134 50 <LLD <LLD - 0 CS-137 60 <LLD <LLD - 0 BA-140 NA <LLD <LLD - 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS AIR PARTICULATE LA-140 NA <LLD <LLD 0 (E-3 PCI/CU.METER)

AIR IODINE GAMMA 466 (E-3 PCI/CU.METER) 1-131 70 <LLD <LLD 0 MILK 1-131 20 I NA <LLD 0 (PCI/LITER)

GAMMA 20 MN-54 NA NA <LLD 0 MILK CO-58 NA NA <LLD 0 (PCI/LITER)

FE-59 NA NA <LLD 0 CO-60 NA NA <LLD 0

• THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS MILK ZN-65 NA NA <LLD 0 (PCI/LITER)

NB-95 NA NA <LLD 0 ZR-95 NA NA <LLD 0 CS-134 15 NA <LLD 0 CS-137 18 NA <LLD 0 BA-140 60 NA <LLD 0 LA-140 15 NA <LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS VEGETATION GAMMA 10 (PCI/KG WET) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD: ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN(M) MEAN(M) MEAN(M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS VEGETATION 1-131 60 <LLD <LLD 0 (PCI/KG WET)

CS-134 60 <LLD <LLD 0 CS-137 80 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 DIRECT RADIATION TLD-QUARTERLY 335 NA 24.6 21.1 27 L-102-2 INDICATOR 0 (MILLI-ROENTGEN/QTR.) (327/327) (8 /8) (4/4)

(19/32) (18/24) (23/32) 0.6 MILES NNE

• THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS 33 of 190

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2008 Location Location Description Distance & Direction From Site A. Surface Water L-21 Illinois River at Seneca, Upstream (control) 4.0 miles NE L-40 Illinois River, Downstream (indicator) 5.2 miles NNW B. Ground/Well Water L-27 LSCS Onsite Well (indicator) 0 miles at station L-28-W4 Marseilles Well (control) 7.0 miles NW L-28-W5 Marseilles Well (control) 6.7 miles NW L-28-W6 Marseilles Well (indicator) 4.1 miles NNE C. Milk - bi-weekly / monthly L-42 Biros Farm (control) 14.2 miles E D. Air Particulates / Air Iodine L-01 Nearsite 1 (indicator) 1.5 miles NNW L-03 Onsite 3 (indicator) 1.0 miles ENE L-04 Rte. 170 (indicator) 3.2 miles E L-05 Onsite 5 (indicator) 0.3 miles ESE L-06 Nearsite 6 (indicator) 0.4 miles WSW L-07 Seneca (indicator) 5.2 miles NNE L-08 Marseilles (indicator) 6.0 miles NNW L-10 Streator (control) 13.5 miles SW L-1 1 Ransom (indicator) 6.0 miles S E. Fish L-34 LaSalle Cooling Lake (indicator) 2.0 miles E L-35 Marseilles Pool of Illinois River, Downstream (indicator) 6.5 miles NW L-36 Illinois River, Upstream of Discharge (control) 4.3 miles NNE F. Sediment L-21 Illinois River at Seneca, Upstream (control) 4.0 miles NE L-40 Illinois River, Downstream (indicator) 5.2 miles NNW L-41 Illinois River, Downstream (indicator) 4.6 miles NNW G. Food Products Quadrant 1 Diane Partridge 4.5 miles NE Quadrant 2 Mike and Gina Welbourne 3.8 miles ESE Quadrant 3 Michael Olson 1.5 miles WSW Quadrant 4 Robert Eisers 4.5 miles NW Control Eugene Clements 10.0 miles NW B-1 34 of 190

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2008 Location Location Description Distance & Direction From Site H. Environmental Dosimetry - TLD Inner Ring L-101-1 and -2 0.5 miles N L-102-1 and -2 0.6 miles NNE L-103-1 and -2 0.7 miles NE L-104-1 and -2 0.8 miles ENE L-105-1 and -2 0.7 miles E L-106-1 and -2 1.4 miles ESE L-107-1 and -2 0.8 miles SE L-108-1 and -2 0.5 miles SSE L-109-1 and -2 0.6 miles S L-1 10-1 and -2 0.6 miles SSW L-111 b-1 and -2 0.8 miles SW L-112-1 and -2 0.9 miles WSW L-113a-1 and -2 0.8 miles W L-114-1 and -2 0.9 miles WNW L-115-1 and -2 0.7 miles NW L-116-1 and -2 0.6 miles NNW Outer Ring L-201-3 and -4 4.0 miles N L-202-3 and -4 3.6 miles NNE L-203-1 and -2 4.0 miles NE L-204-1 and -2 3.2 miles ENE L-205-1 and -2 3.2 miles ESE L-205-3 and -4 5.1 miles E L-206-1 and -2 4.3 miles SE L-207-1 and -2 4.5 miles SSE L-208-1 and -2 4.5 miles S L-209-1 and -2 4.0 miles SSW L-210-1 and -2 3.3 miles SW L-211-1 and -2 4.5 miles WSW L-212-1 and -2 4.0 miles WSW L-213-3 and -4 4.9 miles W L-214-3 and -4 5.1 miles WNW L-215-3 and -4 5.0 miles NW L-216-3 and -4 5.0 miles NNW Other L-01-1 and -2 Nearsite 1 (indicator) 1.5 miles NNW L-03-1 and -2 Onsite 3 (indicator) 1.0 miles ENE L-04-1 and -2 Rte. 170 (indicator) 3.2 miles E L-05-1 and -2 Onsite 5 (indicator) 0.3 miles ESE L-06-1 and -2 Nearsite 6 (indicator) 0.4 miles WSW L-07-1 and -2 Seneca (indicator) 5.2 miles NNE L-08-1 and -2 Marseilles (indicator) 6.0 miles NNW L-11-1 and -2 Ransom 6.0 miles S Control and Special Interest L-10-1 and -2 Streator 13.5 miles SW B-2 35 of 190

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2008 Sample Medium Analysis Sampling Method Analytical Procedure Number Surface Water Gamma Spectroscopy Monthly composite TBE, TBE-2007 Gamma emitting radioisotope analysis from weekly grab samples. Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Surface Water Gross Beta Monthly composite TBE, TBE-2008 Gross Alpha and/or gross beta activity in from weekly grab various matrices samples.

Env. Inc., W(DS)-01 Determination of gross alpha and/or gross beta in water (dissolved solids or total residue)

Surface Water Tritium Quarterly composite TBE, TBE-201 1 Tritium analysis in drinking water by liquid from weekly grab scintillation samples.

Env. Inc., T-02 Determination of tritium in water (direct method)

Ground/Well Water Gamma Spectroscopy Quarterly grab TBE, TBE-2007 Gamma emitting radioisotope analysis samples.

Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Ground/Well Water Tritium Quarterly grab TBE, TBE-201 1 Tritium analysis in drinking water by liquid samples. scintillation Env. Inc., T-02 Determination of tritium in water (direct method)

Fish Gamma Spectroscopy Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis collected via electroshocking or Env. Inc., GS-01 Determination of gamma emitters by other techniques gamma spectroscopy Sediment Gamma Spectroscopy Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis samples Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Particulates Gross Beta One-week composite of TBE, TBE-2008 Gross Alpha and/or gross beta activity in continuous air various matrices sampling through glass fiber filter paper Env. Inc., AP-02 Determination of gross alpha and/or gross beta in air particulate filters Air Particulates Gamma Spectroscopy Quarterly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis each station Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Iodine Gamma Spectroscopy Bi-weekly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis continuous air sampling through Env. Inc., 1-131-02 Determination of 1-131 in charcoal charcoal filter canisters b y gamma spectroscopy (batch method)

Milk 1-131 Bi-weekly grab sample TBE, TBE-2012 Radioiodine in various matrices when cows are on pasture. Monthly all Env. Inc., 1-131-01 Determination of 1-131 in milk by anion other times exchange Milk Gamma Spectroscopy Bi-weekly grab sample TBE, TBE-2007 Gamma emitting radioisotope analysis when cows are on pasture. Monthly all Env. Inc., GS-01 Determination of gamma emitters by other times gamma spectroscopy Food Products Gamma Spectroscopy Annual grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy TLD Thermoluminescence Quarterly TLDs Global Dosimetry Dosimetry comprised of two Global Dosimetry CaF2 elements.

B-3 36 of 190

u__ U U Si U 1tlw t u as u ii to xw".,.,

T D lLccatfcn Figure B-1 Inner Ring TLD Locations of the LaSalle County Station, 2008 B-4 37 of 190

Figure B-2 Outer Ring TLD Locations of the LaSalle County Station, 2008 B-5 38 of 190

d Ridge Weans Katu rnarr Grundy Cauny L.teiln^.a' Figure B-3 Fixed Air Sampling Locations of the LaSalle County Station, 2008 B6 39 of 190

A a

• :tsh n Milk

+ Sediment

• Water Figure B-4 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2008 B-7 40 of 190

APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY

TABLE C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-21 L-40 PERIOD 01/03/08 - 01/31/08 9.9 +/- 2.2 8.5 +/- 2.1 02/07/08 - 02/28/08 6.8 +/- 2.2 6.7 +/- 2.1 03/06/08 - 03/27/08 6.1 +/- 2.7 8.1 +/- 2.9 04/03/08 - 04/24/08 5.9 +/- 2.0 4.7 +/- 1.9 05/01/08 - 05/29/08 6.3 +/- 3.1 4.7 +/- 2.9 06/05/08 - 06/26/08 4.6 +/- 2.1 5.7 +/- 2.2 07/03/08 - 07/31/08 7.3 +/- 2.2 6.1 +/- 2.1 08/06/08 - 08/28/08 8.6 +/- 2.7 11 +/- 2.9 09/04/08 - 09/25/08 8.5 +/- 2.4 9.4 +/- 2.4 10/02/08 - 10/30/08 6.7 +/- 2.0 10 +/- 2.3 11/06/08 - 11/26/08 7.2 +/- 2.3 7.6 +/- 2.2 12/04/08 - 12/31/08 9.1 +/- 2.4 8.2 +/- 2.4 MEAN 7.3 +/- 3.0 7.5 +/- 3.9 TABLE C -1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-21 L-40 PERIOD 01/03/08 - 03/27/08 182 +/- 110 < 166 04/03/08 - 06/26/08 332 +/- 123 246 +/- 117 07/03/08 - 09/25/08 < 175 < 173 10/02/08 - 12/31/08 127 +/- 83 181 +/- 88 MEAN 214 +/- 212 214 +/- 92

• THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES C-1 42 of 190

TABLE C-I.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-21 01/03/08 - 01/31/08 <1 <2 <4 <2 <3 <2 <3 < 14 <1 <1 < 19 <7 02/07/08 - 02/28/08 <2 <3 <5 <2 <4 <3 <5 < 12 <2 <2 < 22 <7 03/06/08 - 03/27/08 <3 <3 <8 <3 <6 <3 <6 < 14 <3 <3 < 25 <9 04/03/08 - 04/24/08 <3 <3 <7 <3 <6 <3 <5 < 14 <3 <3 < 28 <9 05/01/08 - 05/29/08 <1 <2 <3 <1 <3 <2 <3 <9 <1 <2 < 15 <4 06/05/08 - 06/26/08 <2 <3 <5 <2 <4 <2 <4 < 13 <2 <2 < 23 <7 07/03/08 - 07/31/08 <2 <2 <5 <2 <4 <2 <4 < 12 <2 <2 < 21 <5 08/06/08 - 08/28/08 <1 <1 <3 <1 <1 <1 <2 < 14 <1 <1 < 18 <5 09/04/08 - 09/25/08 <2 <2 <4 <2 <3 <2 <3 < 14 <1 <2 < 22 <7 10/02/08 - 10/30/08 <1 <1 <3 <1 <2 <1 <2 < 14 <1 <1 < 42 < 11 11/06/08 - 11/26/08 <1 <1 <3 <1 <2 <1 <2 <7 <1 <1 < 40 < 14 12/04/08 - 12/31/08 <1 <1 <3 <1 <2 <1 <2 <12 <1 <1 <17 <5 MEAN L-40 01/03/08 01/31/08 <2 <2 <4 <1 <3 <2 <3 <14 <1 <1 <21 <7 02/07/08 02/28/08 <3 <3 <8 <3 <6 <4 <6 <14 <3 <3 <30 <9 03/06/08 03/27/08 <3 <3 <6 <3 <6 <4 <7 <13 <3 <3 <29 <8 04/03/08 04/24/08 <3 <3 <7 <3 <5 <3 <6 <15 <3 <3 <25 <9 05/01/08 05/29/08 <2 <2 <4 <2 <4 <2 <4 <11 <2 <2 <18 <5 06/05/08 06/26/08 <2 <2 <5 <2 <4 <3 <4 <14 <2 <2 <23 <7 07/03/08 07/31/08 <2 <2 <4 <1 <3 <2 <3 <10 <1 <2 <16 <5 08/06/08 08/28/08 <1 <1 <3 <1 <2 <1 <2 <15 <1 <1 <19 <6 09/04/08 09/25/08 <1 <1 <3 <1 <2 <1 <2 <12 <1 <1 <16 <5 10/02/08 10/30/08 <1 <1 <2 <1 <2 <1 <2 <15 <1 <1 <40 <11 11/06/08 11/26/08 <1 <1 <3 <1 <1 <1 <2 <7 <1 <1 <41 < 14 12/04/08 12/31/08 <1 <1 <3 <1 <2 <1 <2 < 11 <1 <1 < 15 <5 MEAN

TABLE C -I1.1 CONCENTRATIONS OF TRITIUM IN GROUND /WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-27 L-28-W4

• L-28-W5

• L-28-W6 PERIOD 01/10/08 - 01/10/08 < 153 < 152 < 152 04/03/08 - 04/03/08 < 167 < 166 < 168 07/10/08 - 07/10/08 < 176 < 179 < 177 10/16/08 - 10/16/08 < 171 < 169 < 171 MEAN THERE ARE THREE WELLS ASSOCIATED WITH LOCATION L-28 C-3 44 of 190

TABLE C -II.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND /WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co -60 Zn - 65 Nb - 95 Zr- 95 Cs -134 Cs -137 Ba-140 La-140 PERIOD L-27 01/10/08 - 01/10/08 <4 <3 <7 <4 <7 <4 <6 <3 <4 < 21 <6 04/03/08 - 04/03/08 <6 <5 < 14 <6 < 13 <7 < 10 <5 <6 < 31 < 11 07/10/08 - 07/10/08 <3 <3 <8 <4 <7 <4 <6 <3 <4 < 28 < 10 10/08/08 - 10/08/08 <1 <1 <3 <1 <2 <1 <2 <1 <1 < 20 <6 MEAN L-28-W4* 01/10/08 - 01/10/08 <5 <4 < 11 <6 < 10 <5 <8 <5 <5 < 27 < 10 07/10/08 - 07/10/08 <3 <3 <7 <3 <6 <4 <6 <3 <3 < 28 <8 10/16/08 - 10116/08 <1 <2 <3 <1 <3 <2 <3 <1 <1 < 16 <6 MEAN - - - - - - - - - - -

L-28-W5* 04/03/08 - 04/03/08 <7 <7 < 15 <6 < 13 <7 < 12 <6 <7 < 38 < 12 MEAN - - - - - - - - - - -

L-28-W6* 01/10/08 - 01/10/08 <4 <5 < 10 <4 <9 <5 <8 <4 <4 < 26 <9 04/03/08 - 04/03/08 <8 <8 < 15 <8 < 14 <8 < 13 <6 <8 < 32 < 12 07/10/08 - 07/10/08 <4 <4 <9 <4 <7 <4 <7 <3 <4 < 29 < 10 10/16/08 - 10/16/08 <1 <1 <4 <1 <3 <2 <3 <1 <2 < 18 <5 MEAN

• THERE ARE THREE WELLS ASSOCIATED WITH LOCATION L-28

TABLE C-111.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PC/KG WET +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co - 60 Zn-65 Nb-95 Zr-95 Cs -134 Cs- 137 Ba-140 La-140 PERIOD L-34 Channel Catfish 05/21/08 < 41 < 59 < 117 < 51 < 115 < 68 < 91 < 38 < 49 < 1120 < 459 Largemouth Bass 05/21/08 < 23 < 40 < 107 < 34 < 87 < 48 < 79 < 30 < 27 < 1050 < 283 Channel Catfish 10/15/08 < 36 < 42 < 118 < 43 < 81 < 45 < 75 < 36 < 32 < 675 < 189 Largemouth Bass 10/15/08 < 41 < 53 < 129 < 37 < 87 < 51 < 91 < 41 < 46 < 963 < 206 MEAN L-35 Channel Catfish 05/22/08 < 36 < 47 < 100 < 48 < 81 < 49 < 80 < 31 < 33 < 927 < 233 Smallmouth Buffalo 05/22/08 < 42 < 60 < 128 < 35 < 93 < 66 < 88 < 38 < 39 < 1050 < 336 Freshwater Drum 10/16/08 < 62 < 70 < 200 < 64 < 139 < 76 < 131 < 57 < 58 < 1300 < 374 Smallmouth Buffalo 10/16/08 < 37 < 47 < 114 < 31 < 94 < 52 < 83 < 36 < 37 < 879 < 255 MEAN L-36 Channel Catfish 05/22/08 < 55 < 59 < 160 < 50 < 117 < 64 < 105 < 42 < 46 < 1270 < 647 Smallmouth Buffalo 05/22/08 < 38 < 58 < 94 < 44 < 85 < 53 < 91 < 39 < 39 < 1150 < 249 Largemouth Bass 10/16/08 < 47 < 40 < 124 < 41 < 70 < 48 < 85 < 39 < 46 < 913 < 245 Smallmouth Buffalo 10/16/08 < 47 < 49 < 113 < 41 < 91 < 52 < 93 < 35 < 44 < 1040 < 325 MEAN a1 O

h

TABLE C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PC/KG DRY +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb -95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-21 05/15/08 < 59 < 79 < 211 < 59 < 149 < 87 < 153 < 53 < 79 < 1560 < 453 10/02/08 < 46 < 47 < 139 < 42 < 94 < 61 < 112 < 38 < 42 < 845 < 254 MEAN L-40 05/15/08 < 65 < 65 < 136 < 69 < 152 < 79 < 124 < 56 < 74 < 516 < 96 10/02/08 < 49 < 61 < 156 < 41 < 106 < 69 < 117 < 47 < 70 < 1050 < 328 MEAN L-41 05/15/08 < 69 < 62 < 179 < 66 < 134 < 82 < 137 < 59 77 +/- 67 < 567 < 129 10/02/08 < 63 < 71 < 211 < 60 < 165 < 99 < 138 < 53 83 +/- 48 < 1260 < 338 MEAN - - - - - - - - 80 +/- 8 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES

TABLE C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I I GROUP II 1 GROUP III I GROUP IV PERIOD L-03 L-05 L-01 L-06 L-04 L-07 L-08 L-11 L-10 01/03/08 01/10/08 19 +/- 4 22 +/- 4 18 +/- 4 17 +/- 4 19 +/- 4 11 +/- 4 20 +/- 4 19 +/- 4 21-717 01/10/08 01/17/08 32 +/- 5 30 +/- 5 26 +/- 5 29 +/- 5 32 +/- 5 36 +/- 6 36 +/- 5 36 +/- 5 36 +/- 6 01/17/08 01/24/08 28 +/- 5 29 +/- 5 35 +/- 5 29 +/- 5 24 +/- 5 27 +/- 5 26 +/- 5 29 +/- 5 31 +/- 5 01/24/08 01/31/08 24 +/- 5 31 +/- 5 32 +/- 5 30 +/- 5 32 +/- 5 37 +/- 5 32 +/- 5 30 +/- 5 36 +/- 5 01/31/08 02/07/08 16+/-4 14+/-4 14 +/-4 15+/-4 17 +/-4 13+/-4 18+/-4 16+/-4 16+/-4 02/07/08 02/14/08 33 +/- 5 33 +/- 5 25 +/- 5 34 +/- 5 27 +/- 5 35 +/- 5 38 +/- 6 32 +/- 5 33 +/- 5 02/14/08 02/21/08 22 +/- 5 24 +/- 5 26 +/- 5 22 +/- 5 24 +/- 5 19 +/- 5 24 +/- 5 22 +/- 5 24 +/- 5 02/21/08 02/28/08 15 +/- 4 16 +/- 4 13 +/- 4 16 +/- 4 13 +/- 4 12 +/- 4 14 +/- 4 14 +/- 4 15 +/-4 02/28/08 03/06/08 19 +/- 4 21 +/- 5 23 +/- 5 23 +/- 5 21 +/- 5 19 +/- 4 21 +/- 5 24 +/- 5 21 +/- 5 03/06/08 03/13/08 25 +/- 5 27 +/- 5 27 +/- 5 27 +/- 5 25 +/- 5 26 +/- 5 29 +/- 5 27 +/- 5 26 +/- 5 03/13/08 03/20/08 15+/- 4 14 +/-4 12 +/- 4 16 +/-4 18 +/- 4 12 +/-4 16 +/-4 15 +/-4 15 +/- 4 03/20/08 03/27/08 13+/- 4 14 +/-4 17 +/- 4 17 +/-4 18 +/- 4 14 +/-4 17 +/-4 14 +/-4 17 +/- 4 03/27/08 04/03/08 14 +/- 4 12 +/- 4 8+/-3 16 +/- 4 14 +/- 4 11 +/- 4 10 +/- 4 13 +/- 4 13 +/-4 04/03/08 04/09/08 13+/- 4 17 +/-5 23 +/- 5 13 +/-4 17 +/- 4 18 +/-5 20 +/-5 17 +/-4 17 +/-4 04/09/08 04/17/08 9+/-3 11 +/- 3 10 +/- 3 13 +/- 4 10 +/- 3 11 +/- 3 10 +/- 3 10 +/- 3 13 +/-4 04/17/08 04/24/08 17 +/- 4 20 +/- 4 23 +/- 5 17 +/- 4 18 +/- 4 24 +/- 5 22 +/- 4 18 +/- 4 17 +/- 4 04/24/08 05/01/08 17 +/- 5 20 +/- 7 18 +/- 5 17 +/- 5 16 +/- 4 24 +/- 5 19 +/- 5 22 +/- 5 16 +/- 4 05/01/08 05/07/08 18 +/- 4 (1) 22 +/- 5 20 +/- 5 21 +/- 5 22 +/- 5 19 +/- 4 17 +/- 4 21 +/- 5 05/07/08 05/15/08 8+/-3 (1) 10 +/- 4 9+/-4 13 +/- 4 11 +/- 4 12 +/- 4 9 +/-3 8 +/-4 05/15/08 05/22/08 12 +/- 4 12 +/- 4 13 +/- 4 10 +/- 4 12 +/- 4 11 +/- 4 13 +/- 4 11 +/- 4 11 +/- 4 05/22/08 05/29/08<5 7+/-4 <5 6+/-4 6 +/-4 6+/-4 6+/-4 7+/-4 6+/-4 05/29/08 06/05/08 14 +/- 4 16 +/-4 15 +/- 4 14 +/-4 16 +/- 4 13 +/-4 13 +/-4 21 +/-5 19 +/-4 06/05/08 06/12/08 13 +/- 4 14 +/-4 12 +/- 4 15 +/-4 9+/-4 9 +/-4 14 +/-4 11 +/-4 13 +/-4 06/12/08 06/19/08 14 +/- 4 14 +/-4 14 +/- 4 14 +/-4 15 +/- 4 13 +/-4 14 +/-4 14 +/-4 13 +/-4 06/19/08 06/26/08 15 +/- 4 14 +/-4 15 +/- 4 16 +/-4 13 +/- 4 17 +/-4 19 +/-4 18 +/-5 13 +/- 4 06/26/08 07/03/08 19 +/- 4 13 +/-4 14 +/- 4 15 +/-4 16 +/- 4 15 +/-4 15 +/-4 17 +/-4 15 +/-4 07/03/08 07/10/08 12 +/- 4 12 +/-4 12 +/- 4 11 +/-4 10 +/- 4 10 +/- 4 14 +/-4 14 +/-4 13 +/-4 07/10/08 07/17/08 17+/- 4 18 +/-4 17 +/- 5 17 +/-4 19 +/- 4 22 +/- 5 19 +/-4 20 +/-4 17 +/- 4 07/17/08 07/24/08 17 +/- 4 18 +/-4 17 +/- 4 18 +/- 4 20 +/- 5 20 +/- 5 23 +/- 5 22 +/- 5 18 +/- 4 07/24/08 07/31/08 20 +/- 4 17 +/- 4 21 +/- 4 19 +/- 4 18 +/- 4 16 +/- 4 22 +/- 4 23 +/- 5 18 +/- 4 07/31/08 08/06/08 18 +/- 4 23 +/- 5 19 +/- 4 21 +/- 5 21 +/- 5 25 +/- 5 26 +/- 5 20 +/- 5 25 +/- 5 08/06/08 08/13/08 14 +/- 4 16 +/- 4 20 +/- 4 15 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 17 +/- 4 15 +/-4 08/13/08 08/21/08 23 +/- 4 24 +/- 5 29 +/- 5 21 +/- 4 28 +/- 5 25 +/- 5 31 +/- 5 24 +/- 5 25 +/- 5 08/21/08 08/28/08 23 +/- 4 19 +/- 4 19 +/- 4 22 +/- 4 18 +/- 4 23 +/- 4 19 +/- 4 23 +/- 4 21 +/- 4 08/28/08 09/04/08 30 +/- 5 25 +/- 5 29 +/- 5 30 +/- 5 35 +/- 5 35 +/- 5 34 +/- 5 38 +/- 6 32 +/- 5 09/04/08 09/11/08 16 +/- 4 17 +/- 4 23 +/- 5 19 +/- 4 19 +/- 4 15 +/- 4 16 +/- 4 17 +/- 4 13 +/- 4 09/11/08 09/18/08 < 39 (1) 12 +/- 4 13 +/- 4 13 +/- 4 11 +/- 4 13 +/- 4 12 +/- 4 12 +/- 4 12 +/- 4 09/18/08 09/25/08 43 +/- 6 45 +/- 6 38 +/- 6 38 +/- 6 45 +/- 6 43 +/- 6 38 +/- 6 44 +/- 6 38 +/- 6 09/25/08 10/02/08 36 +/- 5 29 +/- 5 27 +/- 5 29 +/- 5 38 +/- 5 31 +/- 5 32 +/- 5 32 +/- 5 31 +/- 5 10/02/08 10/08/08 22 +/- 5 21 +/- 5 27 +/- 5 23 +/- 5 21 +/- 5 17 +/- 5 19 +/- 5 15 +/- 4 26 +/- 5 10/08/08 10/16/08 19 +/- 4 20 +/- 4 23 +/- 4 23 +/- 4 23 +/- 4 19 +/- 4 20 +/- 4 21 +/- 4 20 +/- 4 10/16/08 10/23/08 12 +/- 4 15 +/- 4 13 +/- 4 12 +/- 4 16 +/- 4 14 +/- 4 13 +/- 4 17 +/- 4 14 +/-4 10/23/08 10/30/08 18 +/- 5 13 +/- 4 13 +/- 4 15 +/- 5 15 +/- 4 19 +/- 5 18 +/- 5 14 +/- 5 18 +/- 5 10/30/08 11/06/08 34 +/- 5 32 +/- 5 36 +/- 5 38 +/- 6 41 +/- 6 37 +/- 5 42 +/- 6 36 +/- 5 41 +/- 6 11/06/08 11/13/08 15 +/- 4 17 +/- 4 14 +/- 4 17 +/- 4 10 +/- 4 16 +/- 4 14 +/- 4 14 +/- 4 16 +/- 4 11/13/08 11/20/08 16 +/- 4 18 +/- 4 15 +/- 4 21 +/- 4 22 +/- 4 22 +/- 5 22 +/- 4 20 +/- 4 21 +/- 4 11/20/08 11/26/08 17 +/- 5 18 +/- 5 21 +/- 5 23 +/- 5 19 +/- 5 22 +/- 5 16 +/- 5 23 +/- 5 17 +/- 5 11/26/08 12/04/08 21 +/- 4 18 +/-4 19 +/- 4 15 +/-4 17 +/- 4 17 +/-4 16 +/-4 18 +/-4 19 +/-4 12/04/08 12/11/08 24 +/- 5 26 +/- 5 23 +/- 5 19 +/- 5 21 +/- 5 21 +/- 5 24 +/- 5 22 +/- 5 21 +/- 5 12/11/08 12/18/08 29 +/- 5 30 +/- 5 28 +/- 5 32 +/- 5 31 +/- 5 29 +/- 5 31 +/- 5 30 +/- 5 27 +/- 5 12/18/08 12/24/08 22 +/- 5 35 +/- 6 23 +/- 5 30 +/- 5 27 +/- 5 32 +/- 6 27 +/- 5 28 +/- 5 22 +/- 5 12/24/08 12/31/08 33 +/- 5 42 +/- 6 34 +/- 5 30 +/- 5 30 +/- 5 37 +/- 5 37 +/- 5 < 37 (1) 32 +/- 5 MEAN 20 +/- 15 20 +/- 16 20 +/- 15 20 +/- 15 20 +/- 16 21 +/- 18 21 +/- 17 21 +/- 16 20 +/- 16 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-7 48 of 190

TABLE C-V.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - NEAR-SITE LOCATIONS GROUP II - FAR-FIELD LOCATIONS GROUP III - FAR-FIELD LOCATIONS GROUP IV - CONTROL LOCATION COLLECTION MIN MAX MEAN +/- COLLECTION MIN MAX MEAN +/- COLLECTION MIN MAX MEAN +/- COLLECTION MIN MAX MEAN +/-

PERIOD 2SD PERIOD 2SD PERIOD 2SD PERIOD 2SD 01/03/08 01 /31 /08 19 32 27 +/- 9 01/03/08 01/31/08 17 35 27 +/- 13 01/03/08 01/31/08 11 37 28 +/- 15 01/03/08 01/31/08 21 36 31 +/- 14 01/31/08 02/28/08 14 33 21 +/- 16 01/31/08 02/28/08 13 34 21 +/- 15 01/31/08 02/28/08 12 38 21 +/- 16 01/31/08 02/28/08 15 33 22 +/- 17 02/28/08 04/03/08 12 27 17 +/- 11 02/28/08 04/03/08 8 27 19 +/- 12 02/28/08 04/03/08 10 29 18 +/- 11 02/28/08 04/03/08 13 26 19 +/- 10 04/03/08 05/01/08 9 20 15 +/- 8 04/03/08 05/01/08 10 23 17 +/- 9 04/03/08 05/01/08 10 24 17 +/- 10 04/03/08 05/01/08 13 17 16 +/- 4 05/01/08 05/29/08 <5 18 11 +/- 8 05/01/08 05/29/08 <5 22 13 +/- 12 05/01/08 05/29/08 6 22 12 +/- 10 05/01/08 05/29/08 6 21 11 +/- 13 05/29/08 07/03/08 13 19 14 +/- 4 05/29/08 07/03/08 12 16 14 +/- 2 05/29/08 07/03/08 9 21 15 +/- 6 05/29/08 07/03/08 13 19 14 +/- 6 07/03/08 07/31/08 12 20 16 +/- 6 07/03/08 07/31/08 11 21 16 +/- 7 07/03/08 07/31/08 10 23 18 +/- 9 07/03/08 07/31/08 13 18 16 +/- 4 07/31/08 08/28/08 14 24 20 +/- 8 07/31/08 08/28/08 15 29 21 +/- 8 07/31/08 08/28/08 15 31 22 +/- 9 07/31/08 08/28/08 15 25 22 +/- 9 C^ 08/28/08 10/02/08 < 39 45 28 +/- 23 08/28/08 10/02/08 13 38 26 +/- 18 08/28/08 10/02/08 11 45 28 +/- 24 08/28/08 10/02/08 12 38 25 +/- 24 00 10/02/08 10/30/08 12 22 17 +/- 8 10/02/08 10/30/08 12 27 19 +/- 12 10/02/08 10/30/08 13 23 18 +/- 6 10/02/08 10/30/08 14 26 19 +/- 10 10/30/08 12/04/08 15 34 21 +/- 14 10/30/08 12/04/08 14 38 22 +/- 17 10/30/08 12/04/08 10 42 22 +/- 19 10/30/08 12/04/08 16 41 23 +/- 21 12/04/08 12/31/08 22 42 30 +/- 13 12/04/08 12/31/08 19 34 27 +/- 10 12/04/08 12/31/08 < 37 37 29 +/- 10 12/04/08 12/31/08 21 32 26 +/- 11 01/03/08 - 12/31/08 < 5 45 20 +/- 16 01/03/08 - 12/31/08 < 5 38 20 +/- 15 01/03/08 - 12/31/08 < 37 45 21 +/- 17 01/03/08 - 12/31/08 6 41 20 +/- 16 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC COLLECTION Mn-54 Co- 58 Fe-59 Co-60 Zn -65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-01 01/03/08 - 04/03/08 <3 <5 < 14 <1 <6 <6 <9 <3 <2 < 583 < 184 04/03/08 - 07/03/08 <3 <5 < 19 <3 <8 <6 < 11 <2 <2 < 797 < 270 07/03/08 - 10/02/08 <5 < 12 < 92 <3 < 13 < 14 < 26 <4 <3 < 58800 < 14500 10/02/08 - 12/31/08 <4 <4 < 22 <3 < 10 <6 < 10 <3 <3 < 578 < 175 MEAN L-03 01/03/08 - 04/03/08 <4 <6 < 11 <4 < 11 <7 < 13 <3 <3 < 921 < 336 04/03/08 - 07/03/08 <3 <6 < 19 <3 <7 <7 <8 <3 <2 < 685 < 269 07/03/08 - 10/02/08 <3 < 10 < 51 <3 <9 < 12 < 25 <2 <2 < 43700 < 21100 10/02/08 - 12/31/08 <3 <5 < 15 <3 <6 <4 <7 <3 <2 < 458 < 97 MEAN L-04 01/03/08 - 04/03/08 <3 <5 < 12 <2 <8 <5 <9 <3 <3 < 521 < 240 04/03/08 - 07/03/08 <3 <6 < 21 <2 < 10 <7 < 12 <4 <3 < 782 < 451 07/03/08 - 10/02/08 <4 < 11 < 71 <2 <8 < 19 < 27 <4 <2 < 69600 < 20200 10/02/08 - 12/31/08 <2 <5 < 14 <2 <7 <4 <6 <2 <2 < 417 < 68 MEAN L-05 01/03/08 - 04/03/08 <2 <6 < 21 <5 <8 <8 < 11 <3 <3 < 854 < 260 04/03/08 - 07/03/08 <3 <6 < 13 <3 <8 <6 <8 <4 <2 < 835 < 504 07/03/08 - 10/02/08 <4 < 12 < 39 <3 <8 < 14 < 26 <3 <3 < 52900 < 21600 10/02/08 - 12/31/08 <3 <6 < 16 <4 <7 <6 < 10 <3 <3 < 615 < 200 MEAN

TABLE C -V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn -65 Nb-95 Zr-95 Cs -134 Cs-137 Ba-140 La-140 PERIOD L-06 01/03/08 - 04/03/08 <3 <5 < 19 <3 <7 <6 <9 <3 <3 < 619 < 268 04/03/08 - 07/03/08 <4 <7 < 23 <4 < 12 <9 < 13 <4 <4 < 853 < 362 07/03/08 - 10/02/08 <4 < 13 < 61 <3 <7 < 16 < 16 <3 <2 < 43500 < 24100 10/02/08 - 12/31/08 <3 <4 < 16 <2 <5 <5 <8 <3 <3 < 420 < 159 MEAN L-07 01/03/08 - 04/03/08 <2 <4 < 16 <2 <5 <4 <8 <3 <2 < 493 < 194 04/03/08 - 07/03/08 <4 <6 < 18 <2 <6 <7 < 12 <4 <2 < 983 < 352 07/03/08 - 10/02/08 <5 < 16 < 87 <3 < 11 < 18 < 28 <3 <3 < 73400 < 23600 10/02/08 - 12/31/08 <3 <5 < 18 <3 <6 <6 < 11 <3 <3 < 472 < 156 MEAN L-08 01/03/08 - 04/03/08 <4 <6 < 23 <3 < 11 <5 < 12 <3 <4 < 760 < 364 04/03/08 - 07/03/08 <2 <5 < 17 <2 <6 <6 < 10 <3 <2 < 745 < 280 07/03/08 - 10/02/08 <3 < 12 < 68 <4 < 11 < 15 < 19 <3 <2 < 44000 < 29500 10/02/08 - 12/31/08 <3 <4 < 10 <3 <4 <4 <7 <2 <2 < 355 < 120 MEAN L-10 01/03/08 - 04/03/08 <3 <4 < 14 <3 <8 <5 <8 <2 <2 < 561 < 225 04/03/08 - 07/03/08 <4 <6 < 21 <3 <8 <8 < 12 <3 <3 < 940 < 444 07/03/08 - 10/02/08 <4 < 15 < 70 <2 < 11 < 18 < 31 <4 <3 < 73300 < 25500 10/02/08 - 12/31/08 <3 <5 < 23 <3 <6 <6 < 11 <3 <4 < 463 < 178 MEAN

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe- 59 Co-60 Zn - 65 Nb-95 Zr- 95 Cs-134 Cs -137 Ba - 140 La-140 PERIOD L-11 01/03/08 - 04/03/08 <3 <8 < 19 <3 <9 <7 < 12 <3 <3 < 935 < 379 04/03/08 - 07/03/08 <3 <7 < 16 <3 <9 <6 < 11 <3 <3 < 857 < 352 07/03/08 10/02/08 <2 < 10 < 50 <3 <7 < 10 < 19 <2 <2 < 47900 < 18000 10/02/08 - 12/31/08 <3 <5 < 13 <3 <8 <5 <8 <3 <3 < 363 < 136 MEAN

TABLE C -VI.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I I GROUP II GROUP III I GROUP IV 1

PERIOD L-03 L-05 L-01 L-06 L-04 L-07 L-08 L-11 L-10 01/03/08 - 01/10/08 < 66 < 65 < 36 < 65 < 67 < 54 < 56 < 53 < 53 01/10/08 - 01/17/08 < 50 <50 <34 <51 <51 <62 <62 <60 <62 01/17/08 - 01/24/08 < 28 <27 <14 <28 <28 <25 <25 <24 <25 01/24/08 - 01/31/08 < 61 < 59 < 34 < 61 < 61 < 61 < 61 < 59 < 61 01/31/08 - 02/07/08 < 52 < 52 < 31 < 52 < 52 < 60 < 60 < 60 < 60 02/07/08 - 02/14/08 < 38 < 37 < 23 < 38 < 38 < 48 < 48 < 48 < 48 02/14/08 - 02/21/08 < 21 <36 <35 <35 <35 <31 <31 <31 <31 02/21/08 - 02/28/08 < 32 < 33 < 20 < 32 < 31 < 43 < 43 < 42 < 43 02/28/08 - 03/06/08 < 36 < 36 < 36 < 34 < 21 < 47 < 47 < 46 < 46 03/06/08 - 03/13/08 < 30 < 30 < 15 < 30 < 30 < 24 < 24 < 24 < 24 03/13/08 - 03/20/08 < 48 <46 <48 <29 <48 <43 <42 <42 <42 03/20/08 - 03/27/08 < 63 <64 <35 <63 <63 <67 <67 <65 <67 03/27/08 - 04/03/08 < 27 <16 <26 <26 <27 <30 <30 <30 <30 04/03/08 - 04/09/08 < 56 <57 <34 <57 <57 <65 <65 <65 <65 04/09/08 - 04/17/08 < 53 <54 <55 <62 <54 <34 <63 <63 <63 04/17/08 - 04/24/08 < 23 <24 <13 <23 <24 <61 <61 <60 <61 04/24/08 - 05/01/08 < 36 < 62 < 19 < 34 < 34 < 58 < 58 < 57 < 57 05/01/08 - 05/07/08 < 52 (1) < 51 < 48 < 51 < 50 < 32 < 47 < 48 05/07/08 - 05/15/08 < 43 (1) < 34 < 44 < 43 < 52 < 51 < 49 < 51 05/15/08 - 05/22/08 < 46 < 45 < 29 < 47 < 47 < 44 < 44 < 44 < 44 05/22/08 - 05/29/08 < 43 < 43 < 18 < 43 < 43 < 25 < 25 < 25 < 25 05/29/08 - 06/05/08 < 69 <69 <40 <70 <70 <65 <64 <66 <66 06/05/08 - 06/12/08 < 14 < 14 <8 < 14 < 14 < 16 < 16 < 16 < 16 06/12/08 - 06/19/08 < 69 < 70 < 38 < 70 < 68 < 64 < 60 < 62 < 62 06/19/08 - 06/26/08 < 44 < 44 < 26 < 43 < 45 < 33 < 33 < 34 < 33 06/26/08 - 07/03/08 < 62 < 61 < 37 < 61 < 61 < 66 < 68 < 68 < 68 07/03/08 - 07/10/08 < 56 < 56 < 30 < 56 < 56 < 35 < 35 < 35 < 35 07/10/08 - 07/17/08 < 63 < 63 < 34 < 63 < 63 < 51 < 51 < 49 < 50 07/17/08 - 07/24/08 < 16 <17 <11 <16 <16 <20 <19 <19 <20 07/24/08 - 07/31/08 < 41 <40 <24 <40 <40 <51 <50 <50 <52 07/31/08 - 08/06/08 < 66 <66 <28 <66 <65 <63 <61 <61 <61 08/06/08 - 08/13/08 < 61 <62 <34 <62 <61 <48 <48 <48 <48 08/13/08 - 08/21/08 < 35 < 36 < 20 < 35 < 36 < 39 < 38 < 38 < 38 08/21/08 - 08/28/08 < 66 < 67 < 42 < 67 < 65 < 66 < 66 < 65 < 65 08/28/08 - 09/04/08 < 60 < 62 < 37 < 63 < 61 < 50 < 50 < 49 < 49 09/04/08 - 09/11/08 < 54 < 54 < 29 < 54 < 52 < 33 < 33 < 32 < 32 09/11/08 - 09/18/08 < 362 (1) < 51 < 52 < 22 < 52 < 41 < 41 < 41 < 41 09/18/08 - 09/25/08 < 54 < 55 < 30 < 55 < 55 < 60 < 60 < 59 < 59 09/25/08 - 10/02/08 < 67 <67 <41 <66 <66 <56 <57 <57 <57 10/02/08 - 10/08/08 < 69 <69 <38 <69 <69 <61 <62 <60 <60 10/08/08 - 10/16/08 < 57 <56 <31 <57 <56 <56 <56 <54 <54 10/16/08 - 10/23/08 < 67 <67 <67 <63 <37 <53 <50 <53 <53 10/23/08 - 10/30/08 < 39 <39 <21 <39 <39 <64 <63 <64 <64 10/30/08 - 11/06/08 < 69 <70 <38 <69 <68 <68 <68 <68 <68 11/06/08 - 11/13/08 < 64 <65 <35 <64 <64 <67 <69 <69 <69 11/13/08 - 11/20/08 < 65 < 66 < 39 < 66 < 62 < 54 < 54 < 54 < 54 11/20/08 - 11/26/08 < 60 < 60 < 40 < 60 < 60 < 57 < 57 < 57 < 57 11/26/08 - 12/04/08 < 68 < 68 < 54 < 68 < 68 < 68 < 67 < 67 < 67 12/04/08 - 12/11/08 < 68 < 69 < 35 < 69 < 69 < 67 < 66 < 66 < 66 12/11/08 - 12/18/08 < 70 <70 <46 <70 <70 <61 <61 <60 <60 12/18/08 - 12/24/08 < 53 < 52 < 29 < 52 < 53 < 55 < 54 < 54 < 58 12/24/08 - 12/31/08 < 43 < 45 < 25 < 45 < 45 < 42 < 42 < 384 (1) < 42 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-12 53 of 190

TABLE C -VII.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM COLLECTION L-42 PERIOD 01/03/08 < 0.6 02/01/08 < 0.8 03/06/08 < 0.5 04/03/08 < 0.8 05/01/08 < 0.7 05/15/08 < 0.7 05/29/08 < 0.8 06/12/08 < 0.7 06/26/08 < 0.7 07/10/08 < 0.7 07/24/08 < 0.7 08/06/08 < 0.8 08/21/08 < 0.8 09/04/08 < 0.7 09/18/08 < 0.9 10/02/08 < 0.8 10/16/08 < 0.8 10/30/08 < 0.9 11/13/08 < 0.7 12/04/08 < 0.9 MEAN C-13 54 of 190

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54 Co- 58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs- 137 Ba-140 La-140 PERIOD L-42 01/03/08 <7 <7 <13 <7 <18 <9 <14 <6 <9 <31 <10 02/01/08 <5 <5 <12 <7 <13 <6 <10 <5 <6 <34 <12 03/06/08 <5 <5 <12 <6 <12 <6 <7 <5 <6 <26 <9 04/03/08 <5 <5 <12 <5 <13 <5 <8 <5 <5 <24 <8 05/01/08 <6 <7 <16 <8 <17 <7 <12 <8 <7 <43 <11 05/15/08 <7 <7 <15 <6 <15 <6 <12 <6 <6 <37 <13 05/29/08 <4 <5 <11 <4 <10 <5 <9 <5 <5 <34 <9 06/12/08 <6 <7 <16 <6 <16 <6 <12 <6 <6 <40 <12 06/26/08 <4 <5 < 11 <5 < 11 <5 <9 <4 <5 < 33 < 10 07/10/08 <7 <7 <16 <6 <17 <7 <14 <6 <7 <37 <13 07/24/08 <3 <3 <8 <3 <6 <4 <6 <3 <3 <43 <10 08/06/08 <7 <7 <17 <6 <16 <6 <13 <5 <7 <46 <9 08/21/08 <4 <4 <9 <5 <9 <5 <8 <3 <4 <24 <6 09/04/08 <6 <7 <17 <6 <12 <7 <13 <5 <6 <52 <15 09/18/08 <5 <5 <14 <4 <11 <6 <9 <4 <4 <46 <12 10/02/08 <2 <3 <8 <2 <5 <3 <6 <2 <2 <51 <14 10/16/08 <4 <5 <10 <5 <10 <5 <9 <4 <5 <44 <13 10/30/08 <2 <2 <6 <2 <3 <2 <4 <1 <2 <46 <15 11/13/08 <1 <2 <5 <1 <3 <2 <3 <1 <1 <47 <13 12/04/08 <6 <6 <14 <5 <11 <6 <9 <5 <5 <31 <4 MEAN U

O O

TABLE C -VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-CONTROL Cabbage 09/13/08 < 8 < 8 < 20 < 7 < 19 < 9 < 14 < 29 < 7 < 8 < 58 < 18 Carrots 09/13/08 < 16 < 18 < 41 < 17 < 32 < 15 < 31 < 59 < 13 < 14 < 116 < 41 MEAN L-QUAD 1 Cabbage 09/11/08 <9 <9 < 28 <9 < 21 < 10 < 17 < 37 <8 <9 < 74 < 19 Onions 09/11/08 < 12 < 11 < 30 < 12 < 26 < 14 < 23 < 51 < 10 < 11 < 110 < 32 MEAN L-QUAD 2 Cabbage 09/11/08 < 10 < 10 < 28 < 9 < 21 < 11 < 21 < 54 < 10 < 10 < 102 < 27 Onions 09/11/08 < 10 < 11 < 28 < 13 < 26 < 14 < 23 < 49 < 10 < 12 < 100 < 35 MEAN L-QUAD 3 Beet greens 09/11/08 < 12 < 12 < 33 < 11 < 27 < 14 < 23 < 58 < 10 < 13 < 107 < 26 Beets 09/11/08 <9 < 11 < 28 <9 < 23 < 10 < 21 < 44 <9 < 11 < 79 < 20 MEAN L-QUAD 4 Cabbage 09/13/08 <7 <8 < 21 <8 < 20 <9 < 13 < 29 <6 <8 < 58 < 16 Onions 09/13/08 <8 < 10 < 23 < 10 < 18 < 11 < 17 < 41 <8 <9 < 71 < 21 MEAN

TABLE C-IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/- 2 S.D.

L-01-1 24.5 +/- 5.3 25 22 23 28 L-01-2 24.5 +/- 3.5 25 22 25 26 L-03-1 24.0 +/- 6.3 25 22 21 28 L-03-2 24.0 +/- 4.9 26 21 23 26 L-04-1 24.5 +/- 6.8 25 21 23 29 L-04-2 23.0 +/- 5.9 23 20 22 27 L-05-1 23.0 +/- 4.9 24 21 21 26 L-05-2 23.8 +/- 7.9 27 22 19 27 L-06-1 25.5 +/- 3.5 25 24 25 28 L-06-2 24.3 +/- 4.4 25 23 22 27 L-07-1 25.5 +/- 6.2 25 24 23 30 L-07-2 23.0 +/- 5.9 26 20 21 25 L-08-1 23.3 +/- 4.1 25 21 22 25 L-08-2 23.8 +/- 1.9 24 23 23 25 L-10-1 21.5 +/- 3.8 23 21 19 23 L-10-2 20.8 +/- 5.0 21 18 20 24 L-11-1 22.5 +/- 4.2 23 20 22 25 L-11-2 21.0 +/- 4.3 21 19 20 24 L-101-1 24.8 +/- 4.4 26 22 24 27 L-101-2 25.5 +/- 5.3 26 24 23 29 L-102-1 26.0 +/- 6.3 27 23 24 30 L-102-2 27.0 +/- 7.5 26 23 27 32 L-103-1 24.5 +/- 4.2 24 22 25 27 L-103-2 26.8 +/- 7.0 25 25 25 32 L-104-1 24.0 +/- 5.2 25 23 21 27 L-104-2 23.5 +/- 3.8 24 22 22 26 L-105-1 26.3 +/- 8.7 27 22 24 32 L-105-2 25.0 +/- 4.3 25 23 24 28 L-106-1 24.5 +/- 4.2 25 24 22 27 L-106-2 24.0 +/- 5.3 23 22 (1) 27 L-107-1 24.5 +/- 5.0 24 22 24 28 L-107-2 25.3 +/- 3.4 26 25 23 27 L-108-1 25.0 +/- 8.6 25 23 21 31 L-108-2 21.0 +/- 5.7 21 19 19 25 L-109-1 25.8 +/- 3.0 25 27 24 27 L-109-2 27.0 +/- 5.7 27 25 25 31 L-110-1 25.0 +/- 3.3 25 23 25 27 L-110-2 25.5 +/- 5.8 26 22 25 29 L-112-1 24.3 +/- 6.6 26 21 22 28 L-112-2 26.8 +/- 4.4 29 26 24 28 L-114-1 26.3 +/- 7.9 25 23 25 32 L-114-2 24.0 +/- 4.3 24 23 22 27 L-115-1 23.3 +/- 5.7 24 21 21 27 L-115-2 22.5 +/- 6.0 21 21 21 27 L-116-1 23.8 +/- 6.0 23 20 25 27 L-116-2 24.5 +/- 5.3 25 22 23 28 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-16 57 of 190

TABLE C -IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/- 2 S.D.

L-201-3 22.3 +/- 6.0 23 19 21 26 L-201-4 24.5 +/- 3.8 25 23 23 27 L-202-3 23.5 +/- 4.2 24 23 21 26 L-202-4 22.0 +/- 7.1 24 19 19 26 L-203-1 24.0 +/- 1.6 24 24 23 25 L-203-2 24.3 +/- 3.8 24 23 23 27 L-204-1 24.8 +/- 5.0 24 22 25 28 L-204-2 25.3 +/- 5.3 25 23 24 29 L-205-1 25.5 +/- 2.0 25 25 25 27 L-205-2 25.8 +/- 5.7 28 22 25 28 L-205-3 24.5 +/- 5.0 24 22 24 28 L-205-4 24.5 +/- 8.9 23 23 21 31 L-206-1 25.8 +/- 7.7 24 22 26 31 L-206-2 25.0 +/- 7.1 28 23 21 28 L-207-1 25.3 +/- 5.3 28 23 23 27 L-207-2 24.0 +/- 4.3 24 22 23 27 L-208-1 24.0 +/- 4.3 24 22 23 27 L-208-2 25.5 +/- 2.0 25 25 25 27 L-209-1 24.8 +/- 6.6 25 24 21 29 L-209-2 25.0 +/- 3.3 25 25 23 27 L-210-1 26.5 +/- 6.2 26 25 24 31 L-210-2 25.5 +/- 5.0 25 23 25 29 L-211-1 26.8 +/- 7.7 29 23 24 31 L-211-2 25.5 +/- 3.5 28 25 25 24 L-212-1 25.0 +/- 3.7 27 23 24 26 L-212-2 25.3 +/- 5.3 25 23 24 29 L-213-3 23.5 +/- 3.8 24 22 22 26 L-213-4 23.3 +/- 3.4 24 21 23 25 L-214-3 23.8 +/- 3.4 24 22 23 26 L-214-4 24.5 +/- 5.3 28 22 23 25 L-215-3 25.3 +/- 5.3 25 23 24 29 L-215-4 24.8 +/- 5.5 26 22 23 28 L-216-3 24.8 +/- 3.0 26 23 24 26 L-216-4 24.0 +/- 5.2 27 21 23 25 L-111 B-1 25.5 +/- 3.8 27 23 25 27 L-111 B-2 26.8 +/- 2.5 25 27 27 28 L-113A-1 24.8 +/- 2.5 25 23 25 26 L-113A-2 25.0 +/- 5.9 25 22 24 29 C-17 58 of 190

TABLE C-IX.2 MEAN QUARTERLY TLD RESULTS FOR THE INNER RING, OUTER RING, OTHER AND CONTROL LOCATIONS FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTION INNER RING OUTER RING OTHER CONTROL PERIOD +/- 2 S.D.

JAN-MAR 25.0 +/- 3.3 25.3 +/- 3.3 24.6 +/- 2.8 22.0 +/- 2.8 APR-JUN 22.9 +/- 3.6 22.7 +/- 2.9 21.6 +/- 2.9 19.5 +/- 4.2 JUL-SEP 23.6 +/- 3.7 23.2 +/- 3.0 22.2 +/- 3.2 19.5 +/- 1.4 OCT-DEC 28.2 +/- 3.9 27.4 +/- 3.8 26.6 +/- 3.3 23.5 +/- 1.4 TABLE C - IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATION SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/- 2 S.D.

INNER RING 127 19 32 24.9 +/- 5.5 OUTER RING 136 19 31 24.7 +/- 4.9 OTHER 64 19 30 23.8 +/- 5.1 CONTROL 8 18 24 21.1 +/- 4.2 INNER RING STATIONS - L-101-1, L-101-2, L-102-1, L-102-2, L-103-1, L-103-2, L-104-1, L-104-2, L-105-1, L-105-2, L-106-1, L-106-2, L-107-1, L-107-2, L-108-1, L-108-2, L-109-1, L-109-2, L-110-1, L-110-2, L-111 B-1, L-111 B-2, L-112-1, L-112-2, L-113A-1, L-113A-2, L-114-1, L-114-2, L-115-1, L-115-2, L-116-1, L-116-2 OUTER RING STATIONS - L-201-3, L-201-4, L-202-3, L-202-4, L-203-1, L-203-2, L-204-1, L-204-2, L-205-1, L-205-2, L-205-3, L-205-4, L-206-1, L-206-2, L-207-1, L-207-2, L-208-1, L-208-2, L-209-1, L-209-2, L-210-1, L-210-2, L-211-1, L-211-2, L-212-1, L-212-2, L-213-3, L-213-4, L-214-3, L-214-4, L-215-3, L-215-4, L-216-3, L-216-4 OTHER STATIONS - L-01-1, L-01-2, L-03-1, L-03-2, L-04-1, L-04-2, L-05-1, L-05-2, L-06-1, L-06-2, L-07-1, L-07-2, L-08-1, L-08-2, L-11-1, L-11-2 CONTROL STATIONS - L-10-1, L-10-2 C-18 59 of 190

FIGURE C-1 Surface Water - Gross Beta - Station L -21 and L-40 Collected in the Vicinity of LCS, 2000 - 2004 L-21 Illinois Fiver at Seneca 1Lr4 L- 0 Illinois River Downstream C-19 60 of 190

FIGURE C -1 (cont.)

Surface Water - Gross Beta - Station L -21 and L-40 Collected in the Vicinity of LCS, 2005 - 2008 L-21 Illinois River at Seneca 2.0 +

0.0 1 i I I I I I 01-27-05 09-23-05 05-20-06 01-14-07 09-10-07 05-06-08 12-31-08 L-40 Illinois River Downstream 01-27-05 09-23-05 05-20-06 01-14-07 09-10-07 05-06-08 12-31-08 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005

FIGURE C-2 Surface Water - Tritium - Station L-21 (C) and L-40 Collected in the Vicinity of LCS, 2000 - 2004 L -21 (C) Illinois River at Seneca L-40 'Illinois River Downstream C-21 62 of 190

FIGURE C -2 (cont.)

Surface Water - Tritium - Station L-21 (C) and L-40 Collected in the Vicinity of LCS, 2005 - 2008 L-21 Illinois River at Seneca J_

U L-40 Illinois River Downstream J_

U DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-22 63 of 190

FIGURE C-3 Air Particulates - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LCS, 2000 - 2004 L-01 Nearsfte No. 1 U

W L-03 !O n s its No. 3 o1,31.:co 12-31 -0: 12:11,0 1 1 2-31-02 12-31-03 11-30-04 C-23 64 of 190

FIGURE C -3 (cont.)

Air Particulates - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LCS, 2005 - 2008 L-01 Nearsite No. 1 50.0 t k

0.0 I I I I I I i 01-06-05 09-06-05 05-07-06 01-05-07 09-05-07 05-05-08 01-03-09 L-03 Onsite No. 3 0.0 I I I I I I 01-06-05 09-06-05 05-07-06 01-05-07 09-05-07 05-05-08 01-03-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-24 65 of 190

FIGURE C-4 Air Particulates - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LCS, 2000 - 2004 L-05 Onsite No, 5

6. 0 2.u L-O6 Nearsite No. 6 1 0,0 -

0.0 -

Q1$1-G! 12-31-00 12-31-01 1221 ;2-:t1 ^I?i3 12-<<Q-Cu C-25 66 of 190

FIGURE C-4 (cont.)

Air Particulates - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LCS, 2005 - 2008 L-05 Onsite No. 5 I

0.0 I I I I I I i 01-06-05 09-06-05 05-07-06 01-05-07 09-05-07 05-05-08 01-03-09 L-06 Nearsite No. 6 I

10.0 +

0.0 t 01-06-05 09-06-05 05-07-06 01-05-07 09-05-07 05-05-08 01-03-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-26 67 of 190

FIGURE C-5 Air Particulates - Gross Beta - Station L-10 (C)

Collected in the Vicinity of LCS, 2000 - 2004 L.-10 (C) Streator 10:D Q .U --I--

0 1-011Cc" 1 2-1.1,01 2 21 12 11.;13 121-212-04 C-27 68 of 190

FIGURE C-5 (cont.)

Air Particulates - Gross Beta - Station L-10 (C)

Collected in the Vicinity of LCS, 2005 - 2008 L-10 (C) Streator 50.0 r 40.0 10.0 0.0 1 01-06-05 09-06-05 05-07-06 01-05-07 09-05-07 05-05-08 01-03-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-28 69 of 190

FIGURE C-6 Air Particulates - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LCS, 2005 - 2008 L-04 Rte. 170 50.0 r 40.0 10.0 L-07 Seneca 50.0 -r 40.0 } 1 07-07-05 02-04-06 09-04-06 04-04-07 11-02-07 06-01-08 12-30-08 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-29 70 of 190

FIGURE C-7 Air Particulates - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LCS, 2005 - 2008 L-08 Marseilles 50.0 r 40.0 I

I I

I r

r 0.0 I I I I + 1 I 07-07-05 02-04-06 09-04-06 04-04-07 11-02-07 06-01-08 12-30-08 L-11 Ransom 0.0 i I I I I- }

07-07-05 02-04-06 09-04-06 04-04-07 11-02-07 06-01-08 12-30-08 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-30 71 of 190

APPENDIX D INTER -LABORATORY COMPARISON PROGRAM

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

March 2008 E5847-396 Milk Sr-89 pCi/L 83.5 95.8 0.87 A Sr-90 pCi/L 13.9 12.9 1.08 A E5848-396 Milk 1-131 pCi/L 57.3 60.0 0.96 A Ce-141 pCi/L 229 249 0.92 A Cr-51 pCi/L 336 359 0.94 A Cs-134 pCi/L 106 125 0.85 A Cs-137 pCi/L 141 146 0.97 A Co-58 pCi/L 71.8 70.8 1.01 A Mn-54 pCi/L 98.1 94.2 1.04 A Fe-59 pCi/L 102 102 1.00 A Zn-65 pCi/L 135 137 0.99 A Co-60 pCi/L 230 236 0.97 A E5850A-396 AP Ce-141 pCi 163 157 1.04 A Cr-51 pCi 233 227 1.03 A Cs-134 pCi 72.6 79.0 0.92 A Cs-137 pCi 98.3 92.0 1.07 A Co-58 pCi 46.7 44.7 1.04 A Mn-54 pCi 69.8 59.4 1.18 A Fe-59 pCi 72.2 64.5 1.12 A Zn-65 pCi 106 86.4 1.23 W Co-60 pCi 156 149 1.05 A E5849-396 Charcoal 1-131 pCi 65.5 60.1 1.09 A June 2008 E5971-396 Milk Sr-89 pCi/L 83.9 85.0 0.99 A Sr-90 pCi/L 14.4 15.8 0.91 A E5972-396 Milk 1-131 pCi/L 70.9 71.4 0.99 A Ce-141 pCi/L 157 174 0.90 A Cr-51 pCi/L 159 138 1.15 A Cs-134 pCi/L 69.7 76.7 0.91 A Cs-137 pCi/L 115 116 0.99 A Co-58 pCi/L 59.1 61.9 0.95 A Mn-54 pCi/L 139 135 1.03 A Fe-59 pCi/L 98.4 91.7 1.07 A Zn-65 pCi/L 129 127 1.02 A Co-60 pCi/L 101 104 0.97 A E5974-396 AP Ce-141 pCi 206 207 1.00 A Cr-51 pCi 173 164 1.05 A Cs-134 pCi 95.9 91.0 1.05 A Cs-137 pCi 142.0 138.0 1.03 A Co-58 pCi 72.0 73.4 0.98 A Mn-54 pCi 180 160.0 1.13 A Fe-59 pCi 108.0 109.0 0.99 A Zn-65 pCi 159 150 1.06 A Co-60 pCi 129 124 1.04 A

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 2 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

June 2008 E5973-396 Charcoal 1-131 pCi 73. 8 84.1 0.88 A September 2008 E6284 -396 Milk Sr-89 pCi/L 76.2 73.9 1.03 A Sr-90 pCi/L 12.3 11.0 1.12 A E6285-396 Milk 1-131 pCi/L 65.7 67.9 0.97 A Ce-141 pCi/L 145 161 0.90 A Cr-51 pCi/L 406 421 0.96 A Cs-134 pCi/L 196 232 0.84 A Cs-137 pCi/L 147 162 0.91 A Co-58 pCi/L 167 179 0.93 A Mn-54 pCi/L 165 166 0.99 A Fe-59 pCi/L 161 144 1.12 A Zn-65 pCi/L 305 319 0.96 A Co-60 pCi/L 218 234 0.93 A E6287-396 AP Ce-141 pCi 79.5 76.3 1.04 A Cr-51 pCi 208 199 1.05 A Cs-134 pCi 106 110 0.96 A Cs-137 pCi 79.3 76.7 1.03 A Co-58 pCi 87.7 84.4 1.04 A Mn-54 pCi 90.3 78.6 1.15 A Fe-59 pCi 81.7 68.3 1.20 A Zn-65 pCi 144 151 0.95 A Co-60 pCi 111 111 1.00 A E6286-396 Charcoal 1-131 pCi 93.2 90.0 1.04 A December 2008 E6415-396 Milk Sr-89 pCi/L 98.4 91.9 1.07 A Sr-90 pCi/L 18.0 12.6 1.43 N (1)

E6416-396 Milk 1-131 pCi/L 69.2 79.9 0.87 A Ce-141 pCi/L 177 191 0.93 A Cr-51 pCi/L 231 246 0.94 A Cs-134 pCi/L 117 134 0.87 A Cs-137 pCi/L 119 120 0.99 A Co-58 pCi/L 104 104 1.00 A Mn-54 pCi/L 153 152 1.01 A Fe-59 pCi/L 99.6 100 1.00 A Zn-65 pCi/L 177 183 0.97 A Co-60 pCi/L 133 133 1.00 A E6418-396 AP Ce-141 pCi 148 146 1.01 A Cr-51 pCi 202 187 1.08 A Cs-134 pCi 103 102 1.01 A Cs-137 pCi 95.4 91.2 1.05 A Co-58 pCi 81.4 79.2 1.03 A Mn-54 pCi 113 116.0 0.97 A Fe-59 pCi 76.5 76.4 1.00 A Zn-65 pCi 122 139 0.88 A Co-60 pCi 108 101 1.07 A D-2 74 of 190

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 3 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

December 2008 E6417-396 Charcoal 1-131 pCi 65.8 74.1 0.89 A (1) NCR 09-02 initiated to investigate the failure.

(a) Teledyne Brown Engineering reported result.

(b) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(c) Ratio of Teledyne Brown Engineering to Analytics results.

(d) Analytics evaluation based on TBE internal QC limits: A= Acceptable. Reported result falls within ratio limits of 0.80-1.20.

W-Acceptable with warning. Reported result falls within 0. 70-0.80 or 1.20-1.30. N = Not Acceptable. Reported result falls outside the ratio limits of < 0.70 and > 1.30.

D-3 75 of 190

TABLE D-2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 1)

Identification Reported Known Month/Year Number Media Nuclide Units Value (a) Value (b) Control Limits Evaluation (c)

January 2008 Quiktm Response Water Sr-89 pCi/L 37.33 19.0 11.8-25.2 N (1)

Sr-90 pCi/L 40.40 42.7 31.5-49.0 A Ba-133 pCi/L 87.8 90.5 76.2-99.6 A Cs-134 pCi/L 80.67 88.9 72.9-97.8 A Cs-137 pCi/L 222.33 231 208 - 256 A Co-60 pCi/L 98.9 101.0 90.9 - 113 A Zn-65 pCi/L 352 350 315 - 408 A Gr-A pCi/L 13.0 12.7 6.02-18.7 A Gr-B pCi/L 32.7 36.2 23.8-43.8 A H-3 pCi/L 11100 11300 9840 - 12400 A January 2008 RAD 72 Water Sr-89 pCi/L 69.0 65.3 53.0-73.4 A Sr-90 pCi/L 35.6 41.4 30.5-47.6 A Ba-133 pCi/L 25.9 25.7 20.0-29.5 A Cs-134 pCi/L 86.5 92.6 76.0 - 102 A Cs-137 pCi/L 155 158 142 - 176 A Co-60 pCi/L 16.0 14.4 11.4-18.7 A Zn-65 pCi/L 214 204 184 - 240 A Gr-A pCi/L 13.3 14.8 7.15-21.2 A Gr-B pCi/L 21.2 22.5 13.7-30.6 A 1-131 pCi/L 22.8 23.6 19.6-28.0 A H-3 pCi/L 3390 3540 3000 - 3910 A April 2008 Rad 73 Water Sr-89 pCi/L 65.47 60.4 48.6-68.2 A Sr-90 pCi/L 39.80 39.2 28.8-45.1 A Ba-133 pCi/L 59.63 58.3 48.3-64.3 A Cs-134 pCi/L 45.00 46.6 37.4-51.3 A Cs-137 pCi/L 97.97 102 91.8-115 A Co-60 pCi/L 75.47 76.6 68.9-86.7 A Zn-65 pCi/L 109 106 95.4 - 126 A Gr-A pCi/L 41.03 50.8 26.5-63.7 A Gr-B pCi/L 50.20 51.4 35.0-58.4 A 1-131 pCi/L 26.67 28.7 23.9-33.6 A H-3 pCi/L 11633 12000 10400 - 13200 A (1) Could find no cause for Sr-89 failure. Sample sent to outside lab for verification, but the outside laboratory was unable to confirm our numbers or ERA numbers. Studies bracketing these results, RAD 71 and RAD 72, had acceptable Sr-89 results. NCR 08-03 (a) Teledyne Brown Engineering reported result.

(b) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(c) ERA evaluation: A=acceptable. Reported result falls within the Warning Limits. NA=not acceptable. Reported result falls outside of the Control Limits. CE=check for Error. Reported result falls within the Control Limits and outside of the Warning Limit.

D-4 76 of 190

TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 2)

Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c)

January 2008 07-MaW18 Water Cs-134 Bq/L -0.26 (1) A Cs-137 Bq/L 0.029 (1) A Co-57 Bq/L 21 22.8 16.0-29.6 A Co-60 Bq/L 8.2 8.40 5.88-10.92 A H-3 Bq/L 473 472 330 - 614 A Mn-54 Bq/L 12 12.1 8.5-15.7 A Sr-90 Bq/L 10.70 11.4 7.98- 14.82 A Zn-65 Bq/L 15.6 16.3 11.4-21.2 A 07-GrW18 Water Gr-A Bq/L 1.4 1.399 >0.0 - 2.798 A Gr-B Bq/L 3.06 2.43 1.22-3.65 A 07-MaS18 Soil Cs-134 Bq/kg 790 854.0 598-1110 A Cs-137 Bq/kg 568 545 382 - 709 A Co-57 Bq/kg 424 421 295 - 547 A Co-60 Bq/kg 2.307 2.9 (2) A Mn-54 Bq/kg 611 570 399 - 741 A K-40 Bq/kg 6.09 571 400 - 742 A Sr-90 Bq/kg 454 493.0 345 - 641 A Zn-65 Bq/kg 0.162 (1) A 07-RdF18 AP Cs-134 Bq/sample 2 .73 2.5200 1.76-3.28 A Cs-137 Bq/sample 2 .88 2.7 1.89-3.51 A Co-57 Bq/sample 3 .493 3.55 2.49-4.62 A Co-60 Bq/sample 1 .357 1.31 0.92-1.70 A Mn-54 Bq/sample 0 .006 (1) A Sr-90 Bq/sample 1 .61 1.548 1.084 - 2.012 A Zn-65 Bq/sample 2 .59 2.04 1.43-2.65 A 07-GrF18 AP Gr-A Bq/sample 0 .131 0.348 >0.0 - 0.696 A Gr-B Bq/sample 0 .261 0.286 0.143 - 0.429 A January 2008 07-RdV18 Vegetation Cs-134 Bq/sample 5.25 6.28 4.40-8.16 A Cs-137 Bq/sample 3.13 3.41 2.39-4.43 A Co-57 Bq/sample 6.837 6.89 4.82-8.96 A Co-60 Bq/sample 2.44 2.77 1.94-3.60 A Mn-54 Bq/sample 4.45 4.74 3.32-6.16 A K-40 Bq/sample 61.3 (1)

Sr-90 Bq/sample 1.33 1.273 0.891 - 1.655 A Zn-65 Bq/sample 0.085 (1) A August 2008 08-MaW19 Water Cs-134 Bq/L 17.1 19.5 13.7-25.4 A Cs-137 Bq/L 21.4 23.6 16.5-30.7 A Co-57 Bq/L -0.044 (1) A Co-60 Bq/L 10.8 11.6 8.1 -15.1 A H-3 Bq/L 334 341 239 - 443 A Mn-54 Bq/L 13.0 13.7 9.6 - 17.8 A Sr-90 Bq/L 6.55 6.45 4.52- 8.39 A Zn-65 Bq/L 16.5 17.1 12.0-22.2 A

TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2008 (PAGE 2 OF 2)

Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c)

August 2008 08-GrW19 Water Gr-A Bq/L 0.0612 <0.56 (3) A Gr-B Bq/L 0.222 <1.85 (3) A 08-MaS19 Soil Cs-134 Bq/kg 546 581 407 - 755 A Cs-137 Bq/kg 2.52 2.8 (2) A Co-57 Bq/kg 340 333 233 - 433 A Co-60 Bq/kg 157 145.0 102 - 189 A M n-54 Bq/kg 460 415 291 -540 A K-40 Bq/kg 650 571 399 - 741 A Sr-90 Bq/kg 1.40 (1) A Zn-65 Bq/kg -1.53 (1) A 08-RdF19 AP Cs-134 Bq/sample 2 .46 2.6300 1.84 - 3.42 A Cs-137 Bq/sample 0 .0063 (1) A Co-57 Bq/sample 1 .36 1.50 1.05-1.95 A Co-60 Bq/sample 0 .0143 (1) A M n-54 Bq/sample 2 .70 2.64 1.85-3.43 A Sr-90 Bq/sample 1 .42 1.12 0.78-1.46 W Zn-65 Bq/sample 0 .975 0.94 0.66-1.22 A 08-GrF19 AP Gr-A Bq/sample -0 .0037 (4) A Gr-B Bq/sample 0 .540 0.525 0.263 - 0.788 A 08-RdV19 Vegetation Cs-134 Bq/sample 4.36 5.5 3.9-7.2 W Cs-137 Bq/sample -0.03 (1) A Co-57 Bq/sample 6.72 7.1 5.0-9.2 A Co-60 Bq/sample 4.04 4.70 3.3-6.1 A Mn-54 Bq/sample 5.22 5.8 4.1 - 7.5 A K-40 Bq/sample 64.4 (1)

Sr-90 Bq/sample 1.62 1.9 1.3-2.5 A Zn-65 Bq/sample 6.160 6.9 4.8-9.0 A (1) Not evaluated by MAPEP.

(2) Reported a statistically zero result.

(3) Designed to test the Safe Drinking Water screening levels. Labs reporting values less than ref values were found to be acceptable.

(4) False positive test.

(a) Teledyne Brown Engineering reported result.

(b) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(c) DOE/MAPEP evaluation: A=acceptable, W=acceptable with warning, N=not acceptable.

D-6 78 of 190

TABLE D -4 ERA (a) STATISTICAL

SUMMARY

PROFICIENCY TESTING PROGRAM ENVIRONMENTAL, INC., 2008 (Page 1 of 1)

Concentration (pCi/L)

Lab Code b Date Analysis Laboratory ERA Control Result c Result d Limits Acceptance STAP-1143 650.72 03/24/08

+/- Co-60 3.00 730.0 565.0 -912.0 Pass STAP-1143 03/24/08 Cs-134 467.50 +/- 5.53 523.0 341.0 -647.0 Pass STAP-1143 03/24/08 Cs-137 1375.90 +/- 25.41 1450.0 1090.0 -1900.0 Pass STAP-1143 e 03/24/08 Mn-54 0.00 +/- 0.00 0.0 0.0 -10.0 Pass STAP-1143 03/24/08 Sr-90 157.60 +/- 7.70 152.0 66.9 - 236.0 Pass STAP-1143 03/24/08 Zn-65 889.90 +/- 15.90 872.0 604.0 -1210.0 Pass STAP-1144 03/24/08 Gr. Beta 99.90 +/- 3.09 92.2 56.80 - 135.0 Pass STSO-1145 03/24/08 Ac-228 1269.02 +/- 36.81 1180.0 757.0 -1660.0 Pass STSO-1145 03/24/08 Bi-212 1407.10 +/- 56.64 1360.0 357.0 - 2030.0 Pass STSO-1145 03/24/08 Co-60 5219.70 +/- 90.30 5130.0 3730.0 - 6890.0 Pass STSO-1145 03/24/08 Cs-134 5427.30 +/- 102.94 5640.0 3630.0 - 6790.0 Pass STSO-1145 03/24/08 Cs-137 6346.60 +/- 201.80 6010.0 4600.0 -7810.0 Pass STSO-1145 03/24/08 K-40 11052.70 +/- 181.80 11000.0 7980.0 - 14900.0 Pass STSO-1145 e 03/24/08 Mn-54 0.00 +/- 0.00 0.0 0.0 - 10.0 Pass STSO-1145 03/24/08 Pb-212 1198.20 +/- 96.58 1080.0 697.0 -1520.0 Pass STSO-1145 03/24/08 Pb-214 2253.30 +/- 291.60 2020.0 1210.0 -3010.0 Pass STSO-1145 03/24/08 Sr-90 6407.00 +/- 277.00 5360.0 1940.0 -8750.0 Pass STSO-1145 03/24/08 Th-234 2421.80 +/- 321.00 2030.0 644.0 - 3870.0 Pass STSO-1145 03/24/08 Zn-65 2936.20 +/- 73.50 2660.0 2110.0 -3570.0 Pass STVE-1146 03/24/08 Co-60 912.41 +/- 13.59 888.0 600.0 - 1280.0 Pass STVE-1 146 03/24/08 Cs-134 1547.70 +/- 38.81 1540.0 882.0 -2130.0 Pass STVE-1146 03/24/08 Cs-137 1163.80 +/- 20.62 1100.0 807.0 - 1530.0 Pass STVE-1146 03/24/08 K-40 22186.00 +/- 339.40 24600.0 17700.0 - 34800.0 Pass STVE-1 146 e 03/24/08 Mn-54 0.00 +/- 0.00 0.0 0.0 - 10.0 Pass STVE-1146 03/24/08 Sr-90 3825.90 +/- 140.66 4130.0 2310.0 - 5480.0 Pass STVE-1146 03/24/08 Zn-65 1676.80 +/- 43.00 1430.0 1030.0 - 1960.0 Pass STW-1147 03/24/08 Co-60 1430.00 +/- 33.33 1420.0 1240.0 - 1680.0 Pass STW-1147 03/24/08 Cs-134 730.18 +/- 33.39 751.0 555.0 - 862.0 Pass STW-1147 03/24/08 Cs-137 1947.80 +/- 13.80 1990.0 1690.0 -2380.0 Pass STW-1 147 e 03/24/08 Mn-54 0.00 +/- 0.00 0.0 0.0 -10.0 Pass STW-1147 03/24/08 Sr-90 512.03 +/- 43.37 512.0 325.0 - 684.0 Pass STW-1147 03/24/08 Zn-65 708.90 +/- 29.00 694.0 588.0 - 865.0 Pass STW-1120 03/19/07 Zn-65 2009.00 +/- 36.40 1910.0 1600.0 - 2410.0 Pass a

Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing administered by Environmental Resources Associates, serving as a replacement for studies conducted previously by the Environmental Measurements Laboratory Quality Assessment Program (EML).

b Laboratory codes as follows: STW (water), STAP (air filter), STSO (soil), STVE (vegetation).

Unless otherwise indicated, the laboratory result is given as the mean +/- standard deviation for three determinations.

d Results are presented as the known values, expected laboratory precision (1 sigma, 1 determination) and control limits as provided by ERA.

e Included in the testing series as a "false positive". No activity expected.

D-7 79 of 190

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2008 (Page 1 of 2)

Concentration Known Control Date Lab Code ° Analysis Laboratory result Activity Limits d Acceptance STW-1137 01/01/08 Co-57 23.80 +/- 0.60 22.80 16.00 -29.60 Pass STW-1 137 01 /01 /08 Co-60 8.60 +/- 0.50 8.40 5.88 - 10.92 Pass STW-1137 01 /01 /08 Cs-134 -0.021 +/- 0.10 0.00 -1.00 -1.00 Pass STW-1137 01 /01 /08 Cs-137 0.00 +/- 0.10 0.00 -1.00 - 1.00 Pass STW-1137 01 /01 /08 H-3 515.10 +/- 12.70 472.00 330.00 - 614.00 Pass STW-1137 01/01/08 Mn-54 12.90 +/- 0.80 12.10 8.50 -15.70 Pass STW-1137 01 /01/08 Sr-90 12.00 +/- 1.50 11.40 7.98 -14.82 Pass STW-1137 01 /01 /08 Zn-65 16.90 +/- 1.40 16.30 11.40 -21.20 Pass STW-1138 01/01/08 Gr. Beta 2.30 +/- 0.15 2.43 1.22 - 3. 65 Pass STAP-1139 01 /01 /08 Co-57 3.90 +/- 0.07 3.55 2.49 - 4.62 Pass STAP-1 139 01 /01 /08 Co-60 1.43 +/- 0.07 1.31 0.92 -1.70 Pass STAP-1139 01 /01 /08 Cs-134 2.59 +/- 0.16 2.52 1.76 -3.28 Pass STAP-1139 01 /01 /08 Cs-137 3.05 +/- 0.12 2.70 1.89 - 3.51 Pass STAP-1139 01/01/08 Mn-54 0.43 +/- 0.58 0.00 0.00 -1.00 Pass STAP-1139 01/01/08 Sr-90 1.30 +/- 0.27 1.55 1.08 - 2.01 Pass STAP-1139 01 /01 /08 Zn-65 2.36 +/- 0.18 2.04 1.43-2.65 Pass STAP- 1 140 01 /01/08 Gr. Beta 0.34 +/- 0.04 0.29 0.14 - 0.43 Pass STVE-1141 01/01/08 Co-57 8.30 +/- 0.18 6.89 4.82 - 8.96 Pass STVE-1141 01 /01 /08 Co-60 3.03 +/- 0.13 2.77 1.94-3.60 Pass STVE-1141 01 /01 /08 Cs-134 6.53 +/- 0.29 6.28 4.40 - 8.16 Pass STVE-1141 01 /01 /08 Cs-137 3.90 +/- 0.19 3.41 2.39 - 4.43 Pass STVE-1141 4.74 01/ 01/08 M n-54 5.43 +/- 0.21 3. 32 - 6.16 Pass STVE-1141 01/01/08 Zn-65 0.033 +/- 0.10 0.00 0.00 -1.00 Pass STSO-1142 01/01/08 Co-57 483.00 +/- 3.00 421.00 295.00 - 547.00 Pass STSO-1142 01/01/08 Co-60 3.00 +/- 0.80 2.90 0.00 - 5.00 Pass STSO-1142 01/01/08 Cs-134 896.50 +/- 7.40 854.00 598.00 - 1110.00 Pass STSO-1142 01 /01 /08 Cs-137 624.40 +/- 4.10 545.00 382.00 - 709.00 Pass STSO-1142 01 /01 /08 Mn-54 667.20 +/- 3.80 570.00 399.00 -741.00 Pass STSO-1142 01 /01 /08 Zn-65 0.093 +/- 0.91 0.00 0.00 -1.00 Pass STSO-1 158 08/01/08 Co-57 353.02 +/- 2.01 333.00 233.00 - 433.00 Pass STSO-1 158 08/01/08 Co-60 151.99 +/- 1.58 145.00 102.00 - 189.00 Pass STSO-1158 08/01/08 Cs-134 499.72 +/- 2.65 581.00 407.00 - 755.00 Pass STSO-1 158 08/01/08 Cs-137 2.54 +/- 0.25 2.80 0.00 - 5.00 Pass STSO-1 158 08/01/08 K-40 643.94 +/- 15.50 570.00 399.00 - 741.00 Pass STSO-1158 08/01/08 Mn-54 452.14 +/- 2.96 415.00 291.00 -540.00 Pass STSO-1158 08/01/08 Sr-90 1.95 +/- 2.04 0.00 0.00 - 5.00 Pass STSO-1 158 08/01/08 Zn-65 0.10 +/- 2.04 0.00 0.00 - 5.00 Pass D-8 80 of 190

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2008 (Page 2 of 2)

Concentration Known Control Lab Code' Date Analysis Laboratory result Activity Limits d Acceptance STVE-1159 08/01/08 Co-57 8.52 +/- 0.23 7.10 5.00 - 9.20 Pass STVE-1 159 08/01/08 Co-60 5.08 +/- 0.19 4.70 3.30 - 6.10 Pass STVE-1159 08/01/08 Cs-134 5.26 +/- 0.18 5.50 3.90 - 7.20 Pass STVE-1159 08/01/08 Cs-137 0.01 +/- 0.14 0.00 0.00 - 1.00 Pass STVE-1159 08/01/08 Mn-54 6.39 +/- 0.28 5.80 4.10 - 7.50 Pass STVE-1159 08/01/08 Zn-65 7.73 +/- 0.45 6.90 4.80 - 9.00 Pass STW-1162 08/01/08 Co-57 0.03 +/- 0.16 0.00 0.00 - 5.00 Pass STW-1162 08/01/08 Co-60 11.27 +/- 0.23 11.60 8.10 -15.10 Pass STW-1162 08/01/08 Cs-134 17.93 +/- 0.52 19.50 13.70 - 25.40 Pass STW-1162 08/01/08 Cs-137 23.72 +/- 0.43 23.60 16.50 - 30.70 Pass STW-1162 08/01/08 H-3 385.15 +/- 8.93 341.00 239.00 - 443.00 Pass STW-1162 08/01/08 Mn-54 13.87 +/- 0.37 13.70 9.60 - 17.80 Pass STW-1162 08/01/08 Sr-90 6.49 +/- 1.12 6.45 4.52 - 8.39 Pass STW-1162 08/01/08 Zn-65 17.64 +/- 0.61 17.10 12.00 - 22.20 Pass STW-1163 08/01/08 Gr. Beta 0 .12 +/- 0.05 0.00 0.00 - 1.85 Pass a

Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the Department of Energy's Mixed Analyte Performance Evaluation Program, Idaho Operations office, Idaho Falls, Idaho b Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation).

Laboratory codes as follows: STW (water), STAP (air filter), STSO (soil), STVE (vegetation).

d MAPEP results are presented as the known values and expected laboratory precision (1 sigma, 1 determination) and control limits as defined by the MAPEP.

D-9 81 of 190

APPENDIX E EFFLUENT REPORT 82 of 190

TABLE OF CONTENTS INTRODUCTION .................................................................................................................... 1

SUMMARY

............................................................................................................................. 2 1.0. EFFLUENTS ....................................................................................................... 3 1.1. Gaseous Effluents to the Atmosphere .................................................... 3 1.2. Liquids Released to Illinois River ............................................................. 3 2.0. SOLID RADIOACTIVE WASTE ......................................................................... 3 3.0. DOSE TO MAN ................................................................................................... 3 3.1. Gaseous Effluent Pathways .................................................................... 3 3.1.1. Noble Gases .............................................................................. 3 3.1.1.1. Gamma Dose Rates ................................................... 3 3.1.1.2. Beta Air and Skin Dose Rate ...................................... 4 3.1.2. Radioactive Iodine ..................................................................... 5 3.1.2.1. Dose to Thyroid ........................................................... 5 3.2. Liquid Effluent Pathways ......................................................................... 5 3.3. Assessment of Dose to Member of Public .............................................. 5 4.0. SITE METEOROLOGY ...................................................................................... 6 i

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Table of Contents (cont.)

APPENDIX E-1 DATA TABLES AND FIGURES ............................................................. E-1.1 Station Releases Table 1.1-1 Gaseous Effluents Summation of all Releases ............................ E-1.2 Table 1.2-1 Liquid Effluents Summation of all Releases ................................. E-1.3 Table 2.0-1 Solid Radwaste Annual Report .................................................... E-1.4 Table 3.1-1 Maximum Doses Resulting from Airborne Releases .................... E-1.5 Table 3.2-1 Maximum Doses Resulting from Liquid Effluents .......................... E-1.9 Table 3.3.1 10CFR20 Compliance Assessment ............................................... E-1.13 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data ............................................. E-1.17 ii 84 of 190

INTRODUCTION LaSalle County Station, a two-unit BWR station, is located near Marseilles, Illinois in LaSalle county, 3.5 miles south the Illinois River. Both units are rated for 3489 MWt. Unit 1 loaded fuel in March 1982. Unit 2 loaded fuel in late December 1983. The station has been designed to keep releases to the environment at levels below those specified in the regulations.

Liquid effluents, while no longer released from LaSalle County Station, were designed to be released to the Illinois River in controlled batches after radioassay of each batch. Gaseous effluents are released to the atmosphere after delay to permit decay of short-lived (noble) gases. Releases to the atmosphere are calculated on the basis of analyses of routine grab samples of noble gases and tritium as well as continuously collected composite samples of iodine and particulate radioactivity sampled during the course of the year. The results of effluent analyses are summarized on a monthly basis and reported to the Nuclear Regulatory Commission as required per Technical Specifications.

Airborne concentrations of noble gases, tritium, 1-131, and particulate radioactivity in offsite areas are calculated using effluent and meteorological data.

Environmental monitoring is conducted by sampling at indicator and control (background) locations in the vicinity of LaSalle County Station to measure changes in radiation or radioactivity levels that may be attributable to station operations. If significant changes attributable to LaSalle County Station are measured, these changes are correlated with effluent releases. External gamma radiation exposure from noble gases and internal dose from 1-131 in milk are the critical pathways at this site; however, an environmental monitoring program is conducted which also includes these and many other pathways which are less significant in terms of radiation protection.

1 85 of 190

SUMMARY

Gaseous effluents for the period contributed to only a small fraction of the LaSalle County Station Technical Specification limits. Liquid effluents had no contribution to offsite dose, as no liquid radioactive discharges were conducted.

Calculations of environmental concentrations based on effluent, Illinois River flow, and meteorological data for the period indicate that consumption by the public of radionuclides attributable to LaSalle County Station does not exceed regulatory limits. Radiation exposure from radionuclides releases to the atmosphere represented the critical pathway for the period with a maximum individual total dose estimated to be 6.78E-02 mrem for the year, where a shielding and occupancy factor of 0.7 is assumed. The assessment of radiation doses is performed in accordance with the Offsite Dose Calculation Manual (ODCM), specifically, a comparison of preoperational studies with operational controls or with previous environmental surveillance reports and an assessment of the observed impacts of the plant operation on the environment. Control locations are basis for "preoperational data." Yearly data comparisons are provided in Sections 5.1 and 5.2; five-year graphical trend data is provided in Appendix III, Section 7.0. The results of analysis confirm that the station is operating in compliance with 10CFR50 Appendix I, 10CFR20 and 40CFR190.

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1.0 EFFLUENTS 1.1 Gaseous Effluents to the Atmosphere Measured concentrations of noble gases, radioiodine, and particulate radioactivity released to the atmosphere during the year, are listed in Table 1.1-1. A total of 1.58E+03 curies of fission and activation gases were released with a maximum quarterly average release rate of 5.00E+01 pCi/sec.

A total of 4.64E-02 curies of 1-131 was released during the year with a maximum quarterly release rate of 1.47E-03 pCi/sec.

A total of 4.69E-03 curies of beta-gamma emitters was released as airborne particulate matter with a maximum quarterly average release rate of 1.48E-04 pCi/sec. Alpha-emitting radionuclides were below the lower limit of detection (LLD).

A total of 5.84E+01 curies of tritium was released with a maximum quarterly average release rate of 1.85E+00 pCi/sec.

1.2 Liquids Released to Illinois River There were no liquid batch releases in 2008. Continuous release path activity was below applicable Lower Limits of Detection.

2.0 SOLID RADIOACTIVE WASTE Solid radioactive wastes were shipped by truck to the Envirocare Disposal Facility or to a waste processor. For further detail, refer the LaSalle 2008 Radioactive Effluent Release Report. The submittal date of this report was April 30, 2008.

3.0 DOSE TO MAN 3.1 Gaseous Effluent Pathways Table 3.1-1 summarizes the doses resulting from releases of airborne radioactivity via the different exposure pathways.

3.1.1 Noble Gases 3.1.1.1 Gamma Dose Rates Unit 1 and Unit 2 gaseous releases at LaSalle 3

87 of 190

County Station are reported as Unit 1 releases due to a single station vent stack (SVS) release point. Offsite Gamma air and whole body dose rates are shown in Table 3.1-1 and were calculated based on measured release rates, isotopic composition of the noble gases, and average meteorological data for the period. Doses based on concurrent meteorological data are shown in Table 3.4-1. Based on measured effluents and meteorological data, the maximum total body dose to an individual would be 2.12E-02 mrem (Table 3.1-1) for the year, with an occupancy or shielding factor of 0.7 included. The maximum total body dose based on measured effluents and concurrent meteorological data would be 6.06E-03 mrem. (Table 3.4-1).

The maximum gamma air dose was 2.80E-02 mrad (Table 3.1-1) and 1.42E-02 mrad based on concurrent meteorological data (Table 3.4-1).

3.1.1.2 Beta Air and Skin Rates The range of beta particles in air is relatively small (on the order of a few meters or less);

consequently, plumes of gaseous effluents may be considered "infinite" for purpose of calculating the dose from beta radiation incident on the skin.

However, the actual dose to sensitive skin tissues is difficult to calculate due to the effect of the beta particle energies, thickness of inert skin and clothing covering sensitive tissues. For purposes of this report the skin is taken to have a thickness of 7.0 mg/cm2 and an occupancy factor of 1.0 is used. The skin dose from beta and gamma radiation for the year was 2.22E-02 (Table 3.1-1) and 8.20E-03 mrem (Table 3.4-1) based on concurrent meteorological data. The maximum offsite beta dose for the year was 8.40E-03 mrad (Table 3.1-1) and 1.91E-03 mrad (Table 3.4-1) based on concurrent meteorological data.

4 88 of 190

3.1.2 Radioactive Iodine The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine. The radioiodine, 1-131, released during routing operation of the plant, may be made available to man resulting in a dose to the thyroid.

The principal pathway of interest for this radionuclide in ingestion of radioiodine in milk.

3.1.2.1 Dose to Thyroid The hypothetical thyroid dose to a maximum exposed individual living near the station via ingestion of milk was calculated. The radionuclide considered was 1-131 and the source of milk was taken to be the nearest dairy farm with the cows pastured from May through October. The maximum thyroid does due to 1-131 was 6.78E-02 mrem (child) for the year (Table 3.1-1).

3.2 Liquid Effluent Pathways The three principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water, eating aquatic foods, and exposure while on the shoreline.

Not all of these pathways are significant or applicable at a given time but a reasonable approximation of the dose can be made by adjusting the dose formula for season of the year or type and degree of use of the aquatic environment. NRC developed equations* were used to calculate the doses to the whole body, lower gastro-intestinal tracts, thyroid, bone and skin; specific parameters for use in the equations are given in the Offsite Dose Calculation Manual. The maximum whole body dose was 0.00E+00 mrem and organ dose was 0.00E+00 for the year mrem (Table 3.2-1).

3.3 Assessment of Dose to Member of Public During the period January to December, 2008, LaSalle County Station did not exceed these limits as shown in Table 3.1-1 and Table 3.2-1 (based on annual average meteorological data), and As shown in Table 3.3-1:

• The Radiological Effluent Technical Standards (RETS) limits on dose or dose commitment to an individual due to 5

89 of 190

radioactive materials in liquid effluents from each reactor unit (1.5 mrem to the whole body or 5 mrem to any organ during any calendar year; 3 mrem to the whole body or 10 mrem to any organ during the calendar year).

• The RETS limits on air dose in noble gases released in gaseous effluents to a member of the public from each reactor unit (5 mrad for gamma radiation or 10 mrad for beta radiation during any calendar quarter; 10 mrads for gamma radiation or 20 mrad for beta radiation during a calendar year).

• The RETS limits on dose to a member of the public due to iodine-131, iodine-133, tritium, and radionuclides in particulate form with half-lives greater than eight days in gaseous effluents released from each reactor unit (7.5 mrem to any organ during any calendar quarter; 15 mrem to any organ during any calendar year).

• The 10CFR20 limit on Total Effective Dose Equivalent to individual members of the public (100 mrem).

4.0 SITE METEOROLOGY A summary of the site meteorological measurements taken during each calendar quarter of the year is given in Appendix F. The data are presented as cumulative joint frequency distributions of the wind direction for the 375' level and wind speed class by atmospheric stability class determined from the temperature difference between the 375' and 33' levels. Data recovery for these measurements was 99.2% during 2008.

• Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1) 6 90 of 190

APPENDIX E-1 DATA TABLES AND FIGURES

Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2008)

UNITS ONE AND TWO DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES Estimated Units 1st Qtr 2nd Qtr 3rd Qtr 4`t Total Error %

A. Fission and Activation Gas Releases

1. Total Release Activity Ci 3.66E+02 3.18E + 02 2.08E+02 6.90E+02 2.50E+01

2. Average Release Rate uCi/sec 4.66E + 01 4.04E + 01 2.62E+01 8.68E+01

3. Percent of Technical Specification  %

Limit B. Iodine Releases

1. Total 1-131 Activity Ci 1.19E-02 5.94E-03 1.49E-02 1.37E-02 1.50E+01

2. Average Release Rate uCi/sec 1.51E-03 7.55E-04 1.87E-03 1.73E-03

3. Percent of Technical Specification  %

Limit C. Particulate (> 8 day half-life) Releases

1. Gross Activity Ci 9.16E-04 7.75E-04 3.78E-04 2.62E-03 3.50E+01

2. Average Release Rate uci/sec 1.17E-04 9.85E-05 4.76E-05 3.30E-04

3. Percent of Technical Specification  %

Limit

4. Gross Alpha Activity Ci < 1.OOE-11 < I.OOE- 11 <1.OOE-11 <I.OOE-11 D. Tritium Releases

1. Total Release Activity Ci 2.03E+01 1.11E+01 9.26E+00 1.77E+01 1.50E+01

2. Average Release Rate uCi/sec 2.59E+00 1.41E + 00 1.16E+00 2.23E+00

3. Percent of Technical Specification  %

Limit

"*" This information is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in uCi/mI E - 1.2 92 of 190

Table 1.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2008)

LIQUID RELEASES UNIT 1 and UNIT 2 SUMMATION OF ALL LIQUID RELEASES Estimated Units 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Total Error %

A. Fission and Activation Products

1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A

2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD

3. Percent of Applicable Limit * * *

• B. Tritium

1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A

2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD

3. Percent of Applicable Limit * * *

• C. Dissolved Noble Gases

1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A

2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD

3. Percent of Applicable Limit * * *

• D. Gross Alpha

1. Total Activity Released (estimate) Ci <LLD <LLD <LLD <LLD N/A

2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD

3. Percent of Applicable Limit  %

E. Volume of Liquid Waste to Discharge liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A F. Volume of Dilution Water liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A

"*" This information is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in uCi/ml E - 1.3 93 of 190

Table 2.1-1 SOLID RADWASTE ANNUAL REPORT LaSalle County Station Table 2.1-1 deliberately deleted. For solid waste disposal detail, refer to the LaSalle County Station 2008 Effluent Report.

E - 1.4 94 of 190

Table 3.1-1 LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 INFANT RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 6.58E-03 5.62E-03 3.24E-03 1.26E-02 2.80E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

BETA AIR 1.93E-04 1.66E-04 1.24E-04 3.57E-04 8.40E-04 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE )

TOT. BODY 4.98E-03 4.25E-03 2.45E-03 9.50E-03 2.12E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

SKIN 5.22E-03 4.45E-03 2.59E-03 9.95E-03 2.22E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

ORGAN 1.90E-03 1.01E-02 3.65E-02 1.18E-02 6.03E-02 (MREM) (ESE ) (ESE ) (ESE ) (ESE ) (ESE )

THYROID THYROID THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I INFANT RECEPTOR

---

° OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I GAMMA AIR(MRAD) 5.0 0.13 0.11 0.06 0.25 10.0 0.28 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.00 TOT. BODY(MREM) 2.5 0.20 0.17 0.10 0.38 5.0 0.42 SKIN (MREM) 7.5 0.07 0.06 0.03 0.13 15.0 0.15 ORGAN (MREM) 7.5 0.03 0.13 0.49 0.16 15.0 0.40 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.5 95 of 190

Table 3.1- 1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 CHILD RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 6.58E-03 5.62E-03 3.24E-03 1.26E-02 2.80E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

BETA AIR 1.93E-04 1.66E-04 1.24E-04 3.57E-04 8.40E-04 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE )

TOT. BODY 4.98E-03 4.25E-03 2.45E-03 9.50E-03 2.12E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

SKIN 5.22E-03 4.45E-03 2.59E-03 9.95E-03 2.22E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

ORGAN 1.59E-03 1.30E-02 3.94E-02 1.40E-02 6.78E-02 (MREM) (NNE ) (NNE ) (ESE ) (NNE ) (NNE )

THYROID THYROID THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I CHILD RECEPTOR

---

 % OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I GAMMA AIR MRAD) 5.0 0.13 0.11 0.06 0.25 10.0 0.28 BETA AIR MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.00 TOT. BODY MREM) 2.5 0.20 0.17 0.10 0.38 5.0 0.42 SKIN (MREM) 7.5 0.07 0.06 0.03 0.13 15.0 0.15 ORGAN (MREM) 7.5 0.02 0.17 0.53 0.19 15.0 0.45 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.6 96 of 190

Table 3.1 -1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 TEENAGER RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 6.58E-03 5.62E-03 3.24E-03 1.26E-02 2.80E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

BETA AIR 1.93E-04 1.66E-04 1.24E-04 3.57E-04 8.40E-04 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE )

TOT. BODY 4.98E-03 4.25E-03 2.45E-03 9.50E-03 2.12E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

SKIN 5.22E-03 4.45E-03 2.59E-03 9.95E-03 2.22E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

ORGAN 1.18E-03 8.12E-03 2.41E-02 8.79E-03 4.22E-02 (MREM) (NNE ) (NNE ) (NNE ) (NNE ) (NNE )

THYROID THYROID THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I TEENAGER RECEPTOR

---

o OF APP I. -------- - ---

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I GAMMA AIR(MRAD) 5.0 0.13 0.11 0.06 0.25 10.0 0.28 BETA AIR MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.00 TOT. BODY(MREM) 2.5 0.20 0.17 0.10 0.38 5.0 0.42 SKIN (MREM) 7.5 0.07 0.06 0.03 0.13 15.0 0.15 ORGAN (MREM) 7.5 0.02 0.11 0.32 0.12 15.0 0.28 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995

Table 3.1- 1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 ADULT RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 6.58E-03 5.62E-03 3.24E-03 1.26E-02 2.80E-02 (MRAD) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

BETA AIR 1.93E-04 1.66E-04 1.24E-04 3.57E-04 8.40E-04 (MRAD) (ESE ) (ESE ) (ESE ) (ESE ) (ESE )

TOT. BODY 4.98E-03 4.25E-03 2.45E-03 9.50E-03 2.12E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

SKIN 5.22E-03 4.45E-03 2.59E-03 9.95E-03 2.22E-02 (MREM) (WSW ) (WSW ) (WSW ) (WSW ) (WSW )

ORGAN 1.31E-03 8.17E-03 2.49E-02 8.96E-03 4.33E-02 (MREM) (NNE ) (NNE ) (NNE ) (NNE ) (NNE )

THYROID THYROID THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I ADULT RECEPTOR

---

 % OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I GAMMA AIR(MRAD) 5.0 0.13 0.11 0.06 0.25 10.0 0.28 BETA AIR MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.00 TOT. BODY(MREM) 2.5 0.20 0.17 0.10 0.38 5.0 0.42 SKIN (MREM) 7.5 0.07 0.06 0.03 0.13 15.0 0.15 ORGAN (MREM) 7.5 0.02 0.11 0.33 0.12 15.0 0.29 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995

Table 3.2-1 LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 INFANT RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

---

o OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I TOTAL BODY(MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.9 99 of 190

Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 CHILD RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

---

o OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I TOTAL BODY (MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.10 100 of 190

Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 TEENAGER RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

---

o OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I TOTAL BODY (MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1. 11 101 of 190

Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08 CALCULATED 03/23/09 ADULT RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

---

o OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY  % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP.

I TOTAL BODY (MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.12 102 of 190

Table 3.3-1 LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09

1. 10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem /yr 3.43E-01 10 CFR 20.1301 (a)(1) limit mrem/yr 100.0 of limit 0.34 Compliance Summary - 10CFR20 1st 2nd 3rd 4th  % of Qtr Qtr Qtr Qtr Limit TEDE 5.89E-02 9.44E-02 9.08E-02 9.90E-02 0.34 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.13 103 of 190

Table 3.3 - 1 (continued)

LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09

2. 10 CFR 20.1301 (d)/40 CFR 190 Compliance Dose Limit  % of (mrem) (mrem) Limit Whole Body Plume 2.12E-02 (DDE) Skyshine 3.15E-01 Ground 5.57E-04 Total 3.36E-01 25.0 1.35 Organ Dose Thyroid 3.75E-02 75.0 0.05 (CDE) Gonads 5.69E-03 25.0 0.02 Breast 5.69E-03 25.0 0.02 Lung 5.69E-03 25.0 0.02 Marrow 5.70E-03 25.0 0.02 Bone 5.70E-03 25.0 0.02 Remainder 5.73E-03 25.0 0.02 CEDE 6.66E-03 TEDE 3.43E-01 100.0 0.34 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1. 14 104 of 190

Table 3.3-1 (continued)

LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09

1. 10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr 3.54E-01 10 CFR 20.1301 (a)(1) limit mrem/yr 100.0 of limit 0.35 Compliance Summary - 10CFR20 1st 2nd 3rd 4th  % of Qtr Qtr Qtr Qtr Limit TEDE 8.92E-02 8.83E-02 8.73E-02 8.93E-02 0.35 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.15 105 of 190

Table 3.3-1 (continued)

LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09

2. 10 CFR 20.1301 (d)/40 CFR 190 Compliance Dose Limit  % of (mrem) (mrem) Limit Whole Body Plume 0.00E+00 (DDE) Skyshine 3.54E-01 Ground 0.00E+00 Total 3.54E-01 25.0 1.42 Organ Dose Thyroid 0.00E+00 75.0 0.00 (CDE) Gonads 0.00E+00 25.0 0.00 Breast 0.00E+00 25.0 0.00 Lung 0.00E+00 25.0 0.00 Marrow 0.00E+00 25.0 0.00 Bone 0.00E+00 25.0 0.00 Remainder 0.00E+00 25.0 0.00 CEDE 0.00E+00 TEDE 3.54E-01 100.0 0.35 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.16 106 of 190

Table 3.4-1 LaSalle Station - Unit 1 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2008 TYPE OF DOSE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER ANNUAL GAMMA AIR (mrad) 4.140E-03( SE) 2.995E-03( SE) 2.795E-03(WSW) 6.800E-03(SSE) 1.419E-02( SE)

BETA AIR (mrad) 5.800E-04(ESE) 3.115E-04( SE) 2.750E-04( E ) 7.900E-04(ESE) 1.909E-03(ESE)

WHOLE BODY (mrem) 1.755E-03(SSW) 1.155E-03(SSW) 9.800E-04(SSW) 2.680E-03(ESE) 6.055E-03(ESE)

SKIN (mrem) 2.330E-03(ESE) 1.375E-03(ESE) 1.150E-03(SSW) 3.570E-03(ESE) 8.195E-03(ESE)

ORGAN (mrem) 2.130E-04(ESE) 7.700E-05( SE) 1.690E-04( E ) 1.845E-04(ESE) 6.160E-04(ESE)

CRITICAL PERSON Child Child Child Child Child CRITICAL ORGAN Thyroid Thyroid Thyroid Thyroid Thyroid COMPLIANCE STATUS 10 CFR 50 APP. I 10 CFR 50 APP.I TYPE OF DOSE QUARTERLY OBJECTIVE % OF APP. I YEARLY OBJECTIVE  % OF APP. I GAMMA AIR (mrad) 5.0 0.14 10.0 0.14 BETA AIR (mrad) 10.0 0.01 20.0 0.01 WHOLE BODY (mrem) 2.5 0.11 5.0 0.12 SKIN (mrem) 7.5 0.05 15.0 0.05 ORGAN (mrem) 7.5 0.00 15.0 0.00 CRITICAL PERSON Child Child CRITICAL ORGAN Thyroid Thyroid Calculation used release data from the following:

Unit 0 - Chimney Date of calculation: 3/26/2009 E - 1.17 107 of 190

Table 3.4-1 (continued)

LaSalle 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) 4.140E-03( SE) 2.995E-03( SE) 2.795E-03(WSW) 6.800E-03(SSE) 1.419E-02( SE)

BETA AIR (mrad) 5.800E-04(ESE) 3.115E-04( SE) 2.750E-04( E ) 7.900E-04(ESE) 1.909E-03(ESE)

WHOLE BODY (mrem) 1.755E-03(SSW) 1.155E-03(SSW) 9.800E-04(SSW) 2.680E-03(ESE) 6.055E-03(ESE)

SKIN (mrem) 2.330E-03(ESE) 1.375E-03(ESE) 1.150E-03(SSW) 3.570E-03(ESE) 8.195E-03(ESE)

ORGAN (mrem) 2.130E-04(ESE) 7.700E-05( SE) 1.690E-04( E ) 1.845E-04(ESE) 6.160E-04(ESE)

CRITICAL PERSON Child Child Child Child Child CRITICAL ORGAN Thyroid Thyroid Thyroid Thyroid Thyroid COMPLIANCE STATUS 10 CFR 50 APP. I 10 CFR 50 APP.I TYPE OF DOSE QUARTERLY OBJECTIVE % OF APP. I YEARLY OBJECTIVE  % OF APP. I GAMMA AIR (mrad) 5.0 0.14 10.0 0.14 BETA AIR (mrad) 10.0 0.01 20.0 0.01 WHOLE BODY (mrem) 2.5 0.11 5.0 0.12 SKIN (mrem) 7.5 0.05 15.0 0.05 ORGAN (mrem) 7.5 0.00 15.0 0.00 CRITICAL PERSON Child Child CRITICAL ORGAN Thyroid Thyroid Calculation used release data from the following:

Unit 0 - Chimney Date of calculation: 3/26/2009 E - 1.18 108 of 190

APPENDIX F METEOROLOGICAL DATA

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 1 0 0 0 1 NE 0 0 3 4 8 1 16 ENE 0 0 3 0 2 2 7 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 1 8 0 9 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 1 1 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 1 1 0 0 0 2 NNW 0 0 3 1 0 2 6 Variable 0 0 0 0 0 0 0 Total 0 1 11 7 18 6 43 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Unstable 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 5 6 1 0 12 NNE 0 1 5 2 0 0 8 NE 0 0 1 2 0 0 3 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 2 0 0 2 SE 0 0 2 1 0 0 3 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 2 0 0 2 SW 0 0 0 1 2 0 3 WSW 0 0 0 1 0 0 1 W 0 0 0 3 0 1 4 WNW 0 0 1 2 0 4 NW 0 2 2 1 0 0 5 NNW 0 0 1 3 5 0 9 Variable 0 0 0 0 0 0 0 Total 0 3 17 26 8 2 56 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 1 1 0 3 NNE 0 2 7 5 0 0 14 NE 0 0 4 0 0 0 4 ENE 0 0 0 0 0 0 0 E 0 1 1 0 0 0 2 ESE 0 0 0 4 0 0 4 SE 0 0 3 3 0 0 6 SSE 0 1 0 0 2 0 3 S 0 0 0 0 0 0 0 SSW 0 1 2 2 0 0 5 SW 0 0 5 0 0 0 5 WSW 0 0 2 2 1 1 6 W 0 0 8 10 0 1 19 WNW 0 0 1 3 1 1 6 NW 0 0 0 6 2 0 8 NNW 0 0 2 3 2 0 7 Variable 0 0 0 0 0 0 0 Total 0 5 36 39 9 3 92 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 14 36 17 0 0 67 NNE 0 23 49 6 0 0 78 NE 0 7 19 22 1 0 49 ENE 1 4 12 26 12 0 55 E 1 2 35 32 10 0 80 ESE 1 2 8 26 9 0 46 SE 0 2 8 15 1 0 26 SSE 2 3 22 13 6 0 46 S 0 7 12 23 5 0 47 SSW 2 12 21 25 7 1 68 SW 4 5 18 10 12 5 54 WSW 2 11 15 11 3 1 43 W 0 24 34 35 6 7 106 WNW 2 14 31 96 31 21 195 NW 0 11 43 41 12 7 114 NNW 0 8 44 46 5 0 103 Variable 0 0 0 0 0 0 0 Total 15 149 407 444 120 42 1177 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 18 1 0 0 0 19 NNE 1 23 4 0 0 0 28 NE 2 2 5 0 0 0 9 ENE 1 0 3 0 0 0 4 E 0 3 15 9 1 0 28 ESE 1 1 12 11 1 0 26 SE 0 3 13 9 0 0 25 SSE 2 9 20 7 1 0 39 S 1 2 11 32 11 5 62 SSW 0 10 9 43 18 5 85 SW 3 3 9 11 6 1 33 WSW 2 9 4 1 1 0 17 W 3 9 5 9 6 3 35 WNW 1 12 8 6 18 20 65 NW 0 12 31 6 2 2 53 NNW 1 6 4 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 18 122 154 144 65 36 539 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 0 0 0 0 2 NNE 0 0 0 0 0 0 0 NE 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 2 2 0 0 0 4 ESE 0 3 5 0 0 0 SE 0 3 2 4 0 0 9 SSE 1 5 10 1 0 0 17 S 2 5 5 9 4 0 25 SSW 0 2 10 4 1 0 17 SW 0 5 7 0 0 0 12 WSW 0 8 7 5 0 0 20 W 0 8 9 5 0 0 22 WNW 0 22 11 1 1 0 35 NW 0 5 12 1 0 0 18 NNW 0 2 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 4 72 80 30 6 0 192 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 0 0 0 0 1 ESE 0 1 0 0 0 0 1 SE 0 4 0 0 0 0 4 SSE 0 5 2 0 0 0 7 S 0 0 5 3 0 0 8 SSW 0 4 11 4 0 0 19 SW 0 6 12 1 0 0 19 WSW 0 4 3 1 0 0 8 W 0 2 4 0 0 0 6 WNW 0 7 1 0 0 0 8 0 1 1 0 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 35 39 9 0 0 83 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 Sw 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 3 3 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 3 3 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 1 0 1 0 2 NE 0 0 0 1 0 4 5 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 2 0 2 SE 0 0 0 1 0 0 1 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 2 2 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 1 1 2 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 1 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 1 2 4 8 15 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes:

F-10 119 of 190

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 20 27 34 2 87 NNE 1 5 25 48 25 6 110 NE 0 6 16 13 13 13 61 ENE 0 3 10 20 28 14 75 E 1 1 6 17 16 11 52 ESE 1 2 6 17 20 6 52 SE 0 1 6 12 8 2 29 SSE 1 2 4 14 12 2 35 S 1 6 5 10 22 22 66 SSW 0 3 9 13 20 28 73 SW 2 3 11 14 12 15 57 WSW 0 17 14 13 9 3 56 W 1 9 26 26 35 38 135 WNW 2 8 17 39 71 73 210 NW 1 5 29 47 34 9 125 NNW 0 5 15 26 24 6 76 Variable 0 0 0 0 0 0 0 Total 11 80 219 356 383 250 1299 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 59 Hours of missing stability measurements in all stability classes: 1 F-11 120 of 190

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 6 1 0 10 NNE 0 0 6 11 0 0 17 NE 0 0 4 6 1 0 11 ENE 1 0 0 7 1 0 9 E 0 2 1 8 9 5 25 ESE 1 1 0 4 7 10 23 SE 1 0 0 3 2 6 12 SSE 2 2 4 13 18 11 50 S 0 2 3 11 10 57 83 SSW 0 6 3 11 8 78 106 SW 1 1 5 4 4 7 22 WSW 1 1 4 0 5 4 15 W 2 3 13 6 7 25 56 WNW 1 3 10 9 7 53 83 NW 0 3 8 22 19 6 58 NNW 0 3 2 7 0 0 12 Variable 0 0 0 0 0 0 0 Total 10 27 66 128 99 262 592 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 1 F-12 121 of 190

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 1 0 1 0 3 NNE 0 0 0 1 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 2 0 2 0 4 ESE 0 1 0 0 0 3 4 SE 0 0 1 1 1 3 6 SSE 0 1 1 2 4 4 12 S 0 0 3 2 0 18 23 SSW 0 1 0 1 3 16 21 SW 0 0 1 2 2 1 6 WSW 0 1 4 6 5 7 23 W 0 1 3 6 4 7 21 WNW 0 0 2 8 0 2 12 NW 0 1 4 9 9 2 25 NNW 0 0 0 3 5 0 8 Variable 0 0 0 0 0 0 0 Total 0 7 22 41 36 63 169 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes:

F-13 122 of 190

LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 0 0 1 0 0 2 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 1 0 0 1 1 2 5 SSW 0 0 1 2 1 14 18 SW 0 0 2 2 5 0 9 WSW 0 0 1 3 0 0 4 W 0 0 0 1 0 0 1 WNW 0 0 0 0 1 0 1 NW 0 0 0 0 0 0 0 NNW 1 0 0 1 2 0 4 Variable 0 0 0 0 0 0 0 Total 3 0 4 11 10 16 44 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 1 F-14 123 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 1 1 E 0 0 0 0 0 1 1 ESE 0 0 0 1 0 0 1 SE 0 1 0 0 0 0 1 SSE 0 0 3 2 0 0 5 S 0 1 0 2 3 6 12 SSW 0 0 1 5 10 3 19 SW 0 0 1 0 1 1 3 WSW 0 0 1 0 4 1 6 W 0 0 0 3 0 1 4 WNW 0 1 5 5 0 0 11 NW 0 0 4 1 0 0 5 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 3 15 19 18 14 69 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes:. 3 F-15 124 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 4 0 0 7 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 5 1 1 7 E 0 1 0 0 2 2 5 ESE 0 1 1 1 0 4 7 SE 0 0 1 0 0 0 1 SSE 0 0 2 6 0 1 9 S 0 0 1 3 3 3 10 SSW 0 0 3 4 3 2 12 SW 0 1 4 1 2 2 10 WSW 0 0 2 8 4 0 14 W 0 0 1 8 0 1 10 WNW 1 0 7 13 4 0 25 NW 0 0 3 6 1 0 10 NNW 0 1 1 4 0 0 6 Variable 0 0 0 0 0 0 0 Total 1 4 29 63 20 16 133 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-16 125 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 8 0 0 0 12 NNE 0 0 11 3 0 0 14 NE 0 0 1 2 0 0 3 ENE 0 0 3 5 3 0 11 E 0 0 2 1 0 0 3 ESE 0 0 2 0 3 0 5 SE 0 0 0 3 6 1 10 SSE 0 0 2 5 0 0 7 S 0 0 3 3 4 3 13 SSW 0 0 5 7 4 3 19 SW 0 4 6 1 2 0 13 WSW 0 1 10 12 7 1 31 W 0 0 4 6 3 0 13 WNW 0 1 5 8 1 0 15 NW 0 2 6 11 0 19 NNW 0 0 7 18 0 0 25 Variable 0 0 0 0 0 0 0 Total 0 12 75 85 33 8 213 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-17 126 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 28 15 2 3 0 48 NNE 0 21 12 3 1 0 37 NE 1 9 28 33 1 0 72 ENE 0 4 11 27 7 4 53 E 1 6 12 14 1 1 35 ESE 2 5 9 5 1 1 23 SE 0 5 16 4 3 6 34 SSE 0 7 6 10 1 0 24 S 0 5 12 18 20 3 58 SSW 0 7 10 17 8 4 46 SW 3 6 12 14 8 8 51 WSW 1 6 22 16 6 4 55 W 0 15 15 13 16 6 65 WNW 0 12 20 15 12 0 59 NW 1 9 32 25 2 0 69 NNW 0 6 29 22 5 0 62 Variable 0 0 0 0 0 0 0 Total 9 151 261 238 95 37 791 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-18 127 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 22 5 0 0 0 27 NNE 1 15 6 1 0 0 23 NE 1 3 14 1 0 0 19 ENE 0 7 7 7 0 0 21 E 0 6 13 2 0 0 21 ESE 0 7 11 7 7 0 32 SE 0 6 8 5 0 0 19 SSE 0 2 6 14 1 0 23 S 1 8 12 36 7 0 64 SSW 0 6 22 46 4 0 78 SW 0 4 16 7 1 1 29 WSW 4 10 15 11 1 0 41 W 3 10 13 3 5 1 35 WNW 2 7 7 5 9 2 32 NW 0 16 4 2 0 0 22 NNW 1 10 8 1 0 0 20 Variable 0 0 0 0 0 0 0 Total 13 139 167 148 35 4 S06 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-19 128 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 0 0 0 0 2 NNE 1 4 0 0 0 0 5 NE 0 3 0 0 0 0 3 ENE 1 2 0 0 0 0 3 E 1 13 13 0 0 0 27 ESE 0 4 13 1 0 0 18 SE 2 3 14 0 0 0 19 SSE 1 5 4 0 0 0 10 S 1 7 11 2 0 0 21 SSW 0 6 14 2 0 0 22 SW 1 7 8 9 0 0 25 WSW 1 10 10 3 0 0 24 W 2 13 10 0 0 0 25 WNW 4 32 5 0 0 0 41 NW 0 4 5 0 0 0 9 NNW 0 5 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 15 120 107 17 0 0 259 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-20 129 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 1 0 0 0 0 1 E 0 2 0 0 0 0 2 ESE 0 10 3 0 0 0 13 SE 1 10 13 0 0 0 24 SSE 0 13 10 0 0 0 23 S 0 11 4 0 0 0 15 SSW 0 6 13 0 0 0 19 SW 0 10 19 0 0 0 29 WSW 1 11 17 0 0 0 29 W 0 15 10 0 0 0 25 WNW 0 21 1 0 0 0 22 NW 0 7 0 0 0 0 7 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 2 117 90 0 0 0 209 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-21 130 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 1 1 SSW 0 0 0 0 0 2 2 SW 0 0 0 0 0 0 0 WS W 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 3 3 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-22 131 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 4 4 SSW 0 0 0 0 2 3 5 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 1 2 3 W 0 0 0 0 0 0 0 WNW 0 0 1 0 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 1 0 3 9 13 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-23 132 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 2 1 1 4 E 0 0 0 0 0 0 0 ESE 0 0 0 1 0 0 1 SE 0 0 1 0 0 0 1 SSE 0 0 2 5 2 0 9 S 0 1 0 4 2 9 16 SSW 0 0 1 0 1 5 7 SW 0 0 0 0 1 2 3 WSW 0 0 0 1 2 4 7 W 0 0 2 0 3 1 6 WNW 0 0 2 1 0 0 3 NW 0 0 1 1 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 9 15 12 22 59 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-24 133 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 13 16 20 5 3 57 NNE 0 8 14 19 20 4 65 NE 1 1 12 18 36 15 83 ENE 1 3 6 12 22 11 55 E 2 4 5 13 6 7 37 ESE 0 2 11 6 2 12 33 SE 1 4 12 8 15 7 47 SSE 0 2 9 18 7 5 41 S 0 1 7 7 25 47 87 SSW 0 7 16 9 16 40 88 SW 0 6 14 14 15 18 67 WSW 0 5 12 40 22 22 101 W 0 12 13 12 16 21 74 WNW 0 7 22 25 41 14 109 NW 0 7 17 43 35 7 109 NNW 0 6 16 23 19 5 69 Variable 0 0 0 0 0 0 0 Total 5 88 202 287 302 238 1122 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-25 134 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 7 12 6 0 29 NNE 0 3 10 11 3 0 27 NE 0 3 9 7 5 0 24 ENE 0 1 9 8 12 2 32 E 0 0 4 9 5 1 19 ESE 0 1 3 3 8 14 29 SE 0 0 7 4 2 11 24 SSE 0 1 4 5 7 11 28 S 1 2 4 4 9 46 66 SSW 0 1 6 5 16 68 96 SW 0 1 3 6 11 22 43 WSW 1 3 6 11 9 13 43 W 0 3 6 8 14 17 48 WNW 0 2 6 16 11 11 46 NW 0 6 12 9 6 2 35 NNW 2 5 2 11 8 0 28 Variable 0 0 0 0 0 0 0 Total 4 36 98 129 132 218 617 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-26 135 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 2 3 0 0 7 NNE 0 3 0 0 0 0 3 NE 0 0 1 1 0 0 2 ENE 0 0 0 0 0 0 0 E 0 0 0 8 1 1 10 ESE 0 0 3 7 3 5 18 SE 0 0 3 9 8 5 25 SSE 0 0 0 7 4 8 19 S 0 0 0 6 5 11 22 SSW 0 1 0 2 4 10 17 SW 0 1 1 6 9 13 30 WSW 0 1 5 7 4 3 20 W 0 2 6 6 11 2 27 WNW 0 2 4 15 11 1 33 NW 0 2 3 10 7 0 22 NNW 0 3 4 11 1 0 19 Variable 0 0 0 0 0 0 0 Total 0 17 32 98 68 59 274 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-27 136 of 190

LaSalle County Generating Station Period of Record: April - June 2008 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 2 1 0 3 SE 0 0 0 0 2 7 9 SSE 0 0 0 0 3 11 14 S 0 0 0 4 1 11 16 SSW 0 0 1 6 2 1 10 SW 0 1 1 4 0 3 9 WSW 0 0 0 1 5 6 12 W 0 0 2 2 5 2 11 WNW 0 1 1 1 3 0 6 NW 0 1 0 0 0 2 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 3 5 20 22 43 93 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-28 137 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 3 0 0 0 4 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 3 2 3 1 0 9 WSW 0 1 7 1 2 0 11 W 0 0 7 4 0 0 11 WNW 0 0 7 3 0 0 10 NW 0 0 1 5 0 0 6 NNW 0 0 2 1 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 5 29 17 3 0 54 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-29 138 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 10 0 0 0 11 NNE 0 3 1 0 0 0 4 NE 0 0 6 0 0 0 6 ENE 0 0 1 0 0 0 1 E 0 0 1 0 0 0 1 ESE 0 0 2 0 0 0 2 SE 0 0 2 0 0 0 2 SSE 0 0 0 1 0 0 1 S 0 0 3 1 0 0 4 SSW 0 3 5 0 0 0 8 SW 0 4 15 4 0 0 23 WSW 0 5 18 1 0 0 24 W 0 1 23 2 0 0 26 WNW 0 4 21 3 0 0 28 NW 0 1 5 0 0 0 6 NNW 0 1 3 2 0 0 6 Variable 0 0 0 0 0 0 0 Total 0 23 116 14 0 0 153 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-30 139 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 7 16 0 0 0 23 NNE 0 8 5 0 0 0 13 NE 0 2 7 0 0 0 9 ENE 0 1 8 1 0 0 10 E 0 0 6 0 0 0 6 ESE 0 2 0 0 0 5 SE 0 1 5 2 0 0 8 SSE 0 2 3 1 0 0 6 S 0 4 7 2 0 0 13 SSW 0 5 8 0 0 0 13 SW 0 8 13 4 0 0 25 WSW 0 4 10 4 1 0 19 W 0 6 26 4 0 0 36 WNW 0 6 17 2 0 0 25 NW 0 2 9 0 0 0 11 NNW 0 7 19 5 0 0 31 Variable 0 0 0 0 0 0 0 Total 0 66 161 25 1 0 253 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-31 140 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 33 17 3 0 0 54 NNE 2 33 7 0 0 0 42 NE 0 22 32 6 0 0 60 ENE 0 23 32 7 0 0 62 E 0 20 17 3 0 0 40 ESE 1 12 12 0 0 0 25 SE 1 24 18 1 0 0 44 SSE 0 28 18 0 0 0 46 S 0 10 24 1 0 0 35 SSW 1 10 7 4 0 0 22 SW 0 16 29 5 0 0 50 WSW 2 12 11 7 1 0 33 W 0 15 15 1 1 0 32 WNW 2 17 12 5 2 0 38 NW 0 8 16 6 0 0 30 NNW 0 13 20 2 1 0 36 Variable 0 0 0 0 0 0 0 Total 10 296 287 51 5 0 649 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-32 141 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 23 3 1 0 0 28 NNE 3 23 1 0 0 0 27 NE 3 9 16 0 0 0 28 ENE 0 6 21 1 0 0 28 E 1 18 21 2 0 0 42 ESE 0 14 3 0 0 0 17 SE 3 14 2 0 0 0 19 SSE 2 16 6 0 0 0 24 S 2 9 12 1 0 0 24 SSW 3 16 15 1 0 0 35 SW 1 11 11 1 0 0 24 WSW 2 15 15 1 0 0 33 W 3 14 14 0 0 0 31 WNW 0 26 5 0 0 0 31 NW 2 27 5 1 0 0 35 NNW 1 16 3 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 27 257 153 9 0 0 446 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 0 F-33 142 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 15 0 0 0 0 16 NNE 4 8 0 0 0 0 12 NE 1 3 1 0 0 0 5 ENE 0 3 0 0 0 0 3 E 0 18 10 0 0 0 28 ESE 0 32 3 0 0 0 35 SE 2 34 1 0 0 0 37 SSE 2 10 1 1 0 0 14 S 2 19 4 0 0 0 25 SSW 2 8 2 0 0 0 12 SW 2 18 0 0 0 0 20 WSW 0 15 13 0 0 0 28 W 5 10 2 0 0 0 17 WNW 4 14 2 0 0 0 20 NW 4 20 2 0 0 0 26 NNW 3 10 0 0 0 0 13 Variable 0 0 0 0 0 0 0 Total 32 237 41 1 0 0 311 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-34 143 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 2 0 0 0 0 5 NNE 1 1 0 0 0 0 2 NE 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 5 0 0 0 0 5 ESE 3 53 1 0 0 0 57 SE 0 29 0 0 0 0 29 SSE 0 18 1 0 0 0 19 S 2 22 0 0 0 0 24 SSW 0 36 11 0 0 0 47 SW 0 53 5 0 0 0 58 WSW 2 23 18 0 0 0 43 W 0 24 4 0 0 0 28 WNW 1 15 0 0 0 0 16 NW 1 3 0 0 0 0 4 NNW 1 2 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 15 286 40 0 0 0 341 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-35 144 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-36 145 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 1 0 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 1 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 1 0 1 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-37 146 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 1 0 0 1 NE 0 0 0 4 0 0 4 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 3 0 0 3 SSW 0 0 1 0 1 0 2 SW 0 0 1 1 2 4 8 WSW 0 0 1 7 0 0 8 W 0 0 5 5 0 0 10 WNW 0 0 5 0 0 0 5 NW 0 0 0 1 0 2 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 13 23 3 6 45 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-38 147 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 16 34 22 5 2 79 NNE 0 11 31 14 4 0 60 NE 0 17 22 31 16 0 86 ENE 0 14 18 24 8 1 65 E 0 7 13 13 0 0 33 ESE 0 10 18 4 0 0 32 SE 0 22 14 11 3 0 50 SSE 0 14 18 11 0 0 43 S 1 10 19 27 5 0 62 SSW 0 2 14 11 12 4 43 SW 0 7 28 33 19 5 92 WSW 0 10 34 22 8 1 75 W 0 7 53 28 4 2 94 WNW 0 13 32 17 7 3 72 NW 0 4 21 32 13 0 70 NNW 0 9 32 2S 4 0 70 Variable 0 0 0 0 0 0 0 Total 1 173 401 325 108 18 1026 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 0 F-39 148 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 1 11 5 1 24 NNE 2 6 8 14 1 0 31 NE 0 3 3 30 4 0 40 ENE 1 2 11 28 4 1 47 E 1 3 6 16 12 2 40 ESE 0 7 5 11 11 0 34 SE 0 6 4 7 2 0 19 SSE 1 3 5 10 3 1 23 S 2 4 4 10 15 5 40 SSW 4 1 9 7 18 10 49 SW 0 5 8 11 3 4 31 WSW 0 5 5 7 12 1 30 W 0 4 10 14 13 2 43 WNW 2 3 9 17 6 4 41 NW 1 2 12 25 5 1 46 NNW 1 9 5 18 9 0 42 variable 0 0 0 0 0 0 0 Total 15 69 105 236 123 32 580 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-40 149 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 5 5 7 1 0 19 NNE 0 4 7 6 0 0 17 NE 1 3 3 1 0 0 8 ENE 0 3 3 4 1 0 11 E 2 1 6 11 6 0 26 ESE 2 2 6 6 11 2 29 SE 1 1 5 17 8 11 43 SSE 0 5 8 11 5 3 32 S 1 7 6 11 5 1 31 SSW 0 1 5 5 3 4 18 SW 0 0 5 12 8 3 28 WSW 0 1 2 11 9 1 24 W 0 2 10 11 11 5 39 WNW 0 2 12 3 7 1 25 NW 1 1 7 6 2 0 17 NNW 0 1 5 7 2 0 15 Variable 0 0 0 0 0 0 0 Total 9 39 95 129 79 31 382 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-41 150 of 190

LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 1 2 0 0 0 3 E 0 0 2 1 0 0 3 ESE 0 0 1 3 8 2 14 SE 0 0 0 2 13 5 20 SSE 0 0 1 4 6 7 18 S 0 0 1 5 7 0 13 SSW 0 0 1 4 11 7 23 SW 0 0 2 3 11 6 22 WSW 0 0 0 5 9 1 15 W 0 0 7 1 6 5 19 WNW 0 1 2 8 7 0 18 NW 0 0 1 1 0 0 2 NNW 0 0 0 0 1 0 1 Variable 0 0 0 0 0 0 0 Total 0 2 20 37 79 33 171 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-42 151 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 2 0 2 SSE 0 0 0 1 0 0 1 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 1 0 0 1 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 1 0 0 0 1 NNW 0 0 0 0 4 0 4 Variable 0 0 0 0 0 0 0 Total 0 0 2 2 6 0 10 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 16 Hours of missing stability measurements in all stability classes: 4 F-43 152 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 2 2 0 0 5 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 1 0 0 1 SE 0 0 0 1 0 0 1 SSE 0 0 0 1 0 0 1 S 0 0 0 1 0 0 1 SSW 0 0 1 3 2 0 6 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 0 0 1 W 0 0 0 0 0 0 0 WNW 0 0 1 7 0 1 9 NW 0 0 2 0 0 0 2 NNW 0 1 2 2 4 0 9 Variable 0 0 0 0 0 0 0 Total 0 2 8 19 6 1 36 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 4 F-44 153 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 7 0 0 10 NNE 0 0 2 2 0 0 4 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 1 0 0 0 0 1 SE 0 0 0 2 0 0 2 SSE 0 0 1 0 0 0 1 S 0 0 4 0 1 0 5 SSW 0 0 5 11 2 0 18 SW 0 0 0 2 1 0 3 WSW 0 0 0 3 0 0 3 W 0 0 0 1 0 0 1 WNW 0 0 1 8 1 3 13 NW 0 1 1 1 0 0 3 NNW 0 0 0 4 3 0 7 Variable 0 0 0 0 0 0 0 Total 0 2 17 41 8 3 71 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 4 F-45 154 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 22 30 24 1 0 77 NNE 1 10 5 0 0 0 16 NE 0 13 5 0 0 0 18 ENE 1 16 13 13 0 0 43 E 0 5 16 8 0 0 29 ESE 0 2 19 25 7 1 54 SE 0 5 15 17 0 0 37 SSE 0 3 9 5 1 0 18 S 0 3 27 13 9 6 58 SSW 0 12 25 31 4 0 72 SW 0 4 30 12 1 0 47 WSW 1 8 18 22 5 1 55 W 1 10 21 22 2 2 58 WNW 0 10 58 66 18 10 162 NW 0 6 29 37 10 0 82 NNW 0 15 45 72 14 0 146 Variable 0 0 0 0 0 0 0 Total 4 144 365 367 72 20 972 in Hours of calm this stability class: 1 Hours of missing wind measurements in this stability class: 59 Hours of missing stability measurements in all stability classes: 4 F-46 155 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 15 4 1 0 0 22 NNE 2 7 2 0 0 0 11 NE 0 3 3 0 0 0 6 ENE 0 4 10 1 0 0 15 E 0 7 18 12 0 0 37 ESE 1 8 12 17 1 0 39 SE 0 8 2 5 0 0 15 SSE 0 10 5 1 3 0 19 S 1 10 17 12 21 10 71 SSW 1 9 10 21 16 1 58 SW 2 6 16 14 3 0 41 WSW 2 1 4 11 3 4 25 W 3 6 4 4 7 3 27 WNW 0 6 15 14 20 14 69 NW 2 7 26 3 0 0 38 NNW 3 7 16 4 0 0 30 Variable 0 0 0 0 0 0 0 Total 19 114 164 120 74 32 523 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 28 Hours of missing stability measurements in all stability classes: 4 F-47 156 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 9 0 0 0 0 10 NNE 0 1 0 0 0 0 1 NE 0 1 0 0 0 0 1 ENE 1 1 2 0 0 0 4 E 0 10 16 1 0 0 27 ESE 2 6 8 0 0 0 16 SE 0 9 2 0 0 0 11 SSE 1 14 6 3 0 0 24 S 1 7 10 5 0 0 23 SSW 0 3 18 5 0 0 26 SW 1 1 11 5 0 0 18 WSW 0 4 4 0 0 0 8 W 1 2 14 8 0 0 25 WNW 1 18 8 3 0 0 30 NW 0 2 0 0 0 0 2 NNW 0 2 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 9 90 99 30 0 0 228 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 22 Hours of missing stability measurements in all stability classes: 4 F-48 157 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 5 0 0 0 0 5 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 4 0 0 0 0 4 ESE 0 20 3 0 0 0 23 SE 0 9 3 0 0 0 12 SSE 0 16 14 0 0 0 30 S 1 13 25 0 0 0 39 SSW 0 9 20 0 0 0 29 SW 0 10 14 1 0 0 25 WSW 0 14 15 0 0 0 29 W 0 13 11 1 0 0 25 WNW 0 6 1 0 0 0 7 NW 0 0 0 0 0 0 0 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 1 121 106 2 0 0 230 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 2 Hours of missing stability measurements in all stability classes: 4 F-49 158 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 1 0 1 W 0 0 0 0 0 3 3 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 1 3 4 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-50 159 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 1 3 5 W 0 0 0 0 1 1 2 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 1 2 4 7 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-51 160 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 3 1 0 4 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 1 0 1 SSE 0 0 0 1 0 0 1 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 0 1 2 W 0 0 0 0 0 2 2 WNW 0 0 0 1 0 0 1 NW 0 0 1 2 0 0 3 NNW 0 0 0 0 0 3 3 Variable 0 0 0 0 0 0 0 Total 0 0 1 8 2 6 17 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 4 F-52 161 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 3 17 16 28 3 68 NNE 0 7 5 7 3 0 22 NE 0 11 8 4 2 0 25 ENE 0 4 11 11 6 0 32 E 0 2 6 1 5 0 14 ESE 0 2 6 8 17 12 45 SE 0 1 4 16 22 10 53 SSE 0 1 6 8 7 1 23 S 0 4 9 21 16 22 72 SSW 0 1 3 33 33 12 82 SW 1 1 4 19 17 4 46 WSW 1 4 8 17 19 7 56 W 0 5 11 19 31 14 80 WNW 0 4 15 47 45 16 127 NW 0 2 20 25 49 27 123 NNW 0 3 26 22 59 18 128 Variable 0 0 0 0 0 0 0 Total 3 55 159 274 359 146 996 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 172 Hours of missing stability measurements in all stability classes: 4 F-53 162 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 5 4 5 3 0 18 NNE 0 3 3 14 2 0 22 NE 0 2 1 6 0 0 9 ENE 0 1 5 8 3 2 19 E 0 0 3 5 11 14 33 ESE 0 3 0 7 9 18 37 SE 1 2 1 3 6 3 16 SSE 0 1 2 8 2 9 22 S 1 0 6 17 14 52 90 SSW 1 2 3 13 19 35 73 SW 1 0 5 8 18 25 57 WSW 1 4 2 1 1 4 13 W 3 2 8 8 3 17 41 WNW 2 0 7 8 25 32 74 NW 0 1 0 7 20 1 29 NNW 0 1 2 8 14 4 29 Variable 0 0 0 0 0 0 0 Total 11 27 52 126 150 216 582 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 44 Hours of missing stability measurements in all stability classes: 4 F-54 163 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 2 1 0 0 4 NNE 0 0 2 3 0 0 5 NE 0 0 3 4 0 0 7 ENE 0 0 1 2 0 0 3 E 0 0 1 2 4 5 12 ESE 0 0 1 3 9 4 17 SE 0 1 1 5 2 0 9 SSE 1 0 0 5 2 12 20 S 0 0 0 6 8 31 45 SSW 0 0 1 4 6 17 28 SW 0 4 7 6 17 10 44 WSW 0 0 3 6 2 0 11 W 0 1 8 5 5 3 22 WNW 0 0 3 7 10 10 30 NW 0 0 0 6 2 0 8 NNW 0 0 0 3 2 0 5 Variable 0 0 0 0 0 0 0 Total 1 7 33 68 69 92 270 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class:

Hours of missing stability measurements in all stability classes: 4 F-55 164 of 190

LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 1 0 3 4 SE 0 0 0 0 2 5 7 SSE 0 0 0 3 8 3 14 S 0 0 0 1 21 15 37 SSW 0 0 0 0 5 9 14 SW 1 0 1 0 1 4 7 WSW 0 0 1 0 0 0 1 W 0 1 3 0 5 7 16 WNW 0 0 4 1 0 1 6 NW 0 0 0 0 0 0 0 NNW 0 1 1 0 0 1 3 Variable 0 0 0 0 0 0 0 Total 1 3 10 6 42 48 110 Hours of calm in this stability class: 0.

Hours of missing wind measurements in this stability class: 0

,Hours of missing stability measurements in all stability classes: 4 F-56 165 of 190

APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Docket No: 50-373 50-374 LASALLE COUNTY STATION UNITS 1 and 2 Annual Radiological Groundwater Protection Program Report 1 January Through 31 December 2008 Prepared By Teledyne Brown Engineering Environmental Services SM Nuclear LaSalle County Station Marseilles, IL 61341 May 2009 167 of 190

Table Of Contents

1. Summary and Conclusions ................................................................................................ 1 I I . Introduction ........................................................................................................................ 3 A. Objectives of the RGPP ........................................................................................ 3 B. Implementation of the Objectives .......................................................................... 3 C. Program Description .............................................................................................. 4 D. Characteristics of Tritium (H-3) ............................................................................. 4 111. Program Description ......................................................................................................... 5 A. Sample Analysis .................................................................................................... 5 B. Data Interpretation ................................................................................................. 6 C. Background Analysis ............................................................................................. 7

1. Background Concentrations of Tritium ....................................................... 7 IV. Results and Discussion ................................................................................................... 9 A. Groundwater Results ............................................................................................. 9 B. Drinking Water Well Survey ................................................................................ 10 C. Summary of Results - Inter-laboratory Comparison Program ........................... 10 D. Leaks, Spills, and Releases ................................................................................ 11 E. Trends .................................................................................................................. 11 F. Investigations ....................................................................................................... 11 G. Actions Taken ...................................................................................................... 11 168 of 190

Appendices Appendix A Location Designation Tables Table A-1: LaSalle County Station Groundwater Monitoring Sample Point List Figures Figure A-1: LaSalle County Station Map of Groundwater Monitoring Sample Locations.

Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium and Strontium in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table B-1.1 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table B-1.1 Concentrations of Tritium and Strontium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2008.

Table B-11.1 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2008.

ii 169 of 190

I. Summary and Conclusions In 2006, Exelon instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of LaSalle County Station. This evaluation involved numerous station personnel and contractor support personnel. Baseline sampling efforts included the use of six surface water locations, two of which were already included in LaSalle's REMP sampling program, and seventeen groundwater well sampling locations.

Following baseline sampling and subsequent recommendations, LaSalle's RGPP program now consists of the six surface water and nine groundwater well sampling locations. The results for LaSalle's RGPP sampling efforts in 2008 are included in this report.

This is the second in a series of annual reports on the status of the Radiological Groundwater Protection Program (RGPP) conducted at LaSalle County Station.

This report covers groundwater and surface water samples, collected from the environment, both on and off station property in 2008. During that time period, 73 analyses were performed on 43 samples from 15 locations, (6 surface water and 9 ground water wells. The monitoring was conducted by Station personnel In assessing all the data gathered for this report, it was concluded that the operation of LaSalle County Station had no adverse radiological impact on the environment, and there are no known active releases into the groundwater at LaSalle County Station.

The Station's on-going monitoring program consists of analyzing for tritium semi-annually, with gamma emitters and Strontium-89/90 analyzed on a biennial basis.

As such, gamma emitting nuclides and Strontium-89/90 were evaluated in 2008.

In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection 10 times lower than that required by federal regulation.

Tritium was not detected in any of the groundwater or surface water samples at concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Low levels of tritium were detected at concentrations greater than the LLD of 200 pCi/L in 1 of 9 groundwater monitoring locations. The tritium concentrations ranged from 424 +/- 122 pCi/L to 719 +/- 133 pCi/L. No tritium was detected in the six surface water samples above the specified LLD. Elevated tritium levels (> 200 pCi/L) observed in the single well location are believed to be associated with the 2001 CY tank rupture as documented in the stations 10CFR50.75(g) report.

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Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) as specified in the Offsite Dose Calculation Manual (ODCM) in any of the groundwater or surface water samples. In the case of tritium, Exelon specified that it's laboratories achieve a lower limit of detection 10 times lower than that required by federal regulation.

Strontium-90 was not detected at a concentration greater than the LLD of 2.0 picoCuries per liter (pCi/L) in any of the groundwater or surface water samples tested.

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II. Introduction The LaSalle County Station (LCS), consisting of two boiling water reactors, each rated for 3489 MWt, owned and operated by Exelon Corporation, is located in LaSalle County, Illinois. Unit No. 1 went critical on 16 March 1982. Unit No. 2 went critical on 02 December 1983. The site is located in northern Illinois, approximately 75 miles southwest of Chicago, Illinois.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Environmental Inc. (Midwest Labs) on samples collected in 2008.

A. Objective of the RGPP The long-term objectives of the RGPP are as follows:

1. Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources.

2. Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface.

3. Perform routine water sampling and radiological analysis of water from selected locations.

4. Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner.

5. Regularly assess analytical results to identify adverse trends.

6. Take necessary corrective actions to protect groundwater resources.

B. Implementation of the Objectives The objectives identified have been implemented at LaSalle County Station as discussed below:

Exelon and its consultant identified locations as described in the 2006 Phase 1 study. Phase 1 studies were conducted by Conestoga Rovers and Associates (CRA) and the results and conclusions were made available to state and federal regulators as well as the public on an Exelon web site in station specific reports.

http://www.exelonCorp.com/ourcompanies /powergen /nuclear/Tritiu 172 of 190

m.htm

2. The LaSalle County Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

3. LaSalle County Station will continue to perform routine sampling and radiological analysis of water from selected locations.

4. LaSalle County Station has implemented new procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.

5. LaSalle County Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

C. Program Description

1. Sample Collection Sample locations can be found in Table A--1, Appendix A.

Groundwater and Surface Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following EPA methods. Both groundwater and surface samples water are collected. Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management, and shipment of samples, as well as in documentation of sampling events.

Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables as data are received.

Analytical data results are reviewed by both station personnel and an independent hydrogeologist for adverse trends or changes to hydrogeologic conditions.

D. Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The 173 of 190

most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.

Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-7 and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (3He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides because it emits very weak radiation and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs. The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue.

Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the LaSalle County Station RGPP in 2008.

In order to achieve the stated objectives, the current program includes the following analyses:

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Concentrations of gamma emitters in groundwater and surface water. (Biennially)

2. Concentrations of strontium in groundwater and surface water.

(Biennially)

3. Concentrations of tritium in groundwater and surface water. (Semi-annually)

B. Data Interpretation The radiological data collected prior to LaSalle County Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, LaSalle County Station was considered operational at initial criticality. Several factors were important in the interpretation of the data:

1. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is specified by federal regulation as a minimum sensitivity value that must be achieved routinely by the analytical parameter.

2. Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 50% of the measurement value.

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated.

Exelon reports the TPU by following the result with plus or minus +/-

the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the AREOR.

6 175 of 190

C. Background Analysis A pre-operational radiological environmental monitoring program (pre-operational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, precipitation, marine life, and foodstuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for LaSalle County Nuclear Power Station, Commonwealth Edison Company, Annual Reports for the years 1979 and 1981. The pre-operational REMP contained analytical results from samples collected from the surface water and groundwater.

1. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others. Additional detail may be found by consulting references (CRA 2006).

a. Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, "Cosmogenic" tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle. Below ground, "lithogenic" tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and strontium-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s, and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue 176 of 190

to influence tritium concentrations in the environment.

b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPA's RadNet database. GNIP provides tritium precipitation concentration data for samples collected world wide from 1960 to 2006.

RadNet provides tritium precipitation concentration data for samples collected at stations through out the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. LaSalle's 1979 or 1981 pre-operational REMP showed precipitation tritium concentrations >300 pCi/L. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River. Illinois surface water data were typically less than 100 pCi/L. Illinois River H3 results have shown

>200 pCi/L, as evidenced in LaSalle's REMP program sample results. This could be attributable to release for Braidwood and Dresden upstream The USEPA RadNet surface water data typically has a reported `Combined Standard Uncertainty' of 35 to 50 pCi/L.

According to USEPA, this corresponds to a +/- 70 to 100 pCi/L 95% confidence bound on each given measurement.

Therefore, the typical background data provided may be 177 of 190

subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 -

240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV. Results and Discussion A. Groundwater Results Groundwater Samples were collected from on and off-site wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from nine locations were analyzed for tritium activity (Table B-1.1, Appendix B). Tritium values ranged from non detectable to 719 pCi/L at well MW-LS-1 05S. Outside of the owner-controlled area, tritium concentrations were less than the detection limit . Based on the hyrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply.

Based on established aquifer flow paths the location most representative of potential offsite release into groundwater was also less than the detection limit.

Strontium No Sr-90 activity was detected in any of the ground water samples analyzed (Table B-1.1, Appendix B).

Gamma Emitters Potassium-40 was detected in three of nine samples.

Potassium-40 values ranged from 49 pCi/Liter to 67 pCi/Liter. No other gamma emitting nuclides were detected (Table B-1.2, 178 of 190

Appendix B).

B. Surface Water Results Surface Water Samples were collected from on and off-site wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from six locations were analyzed for tritium activity (Table B-11.1, Appendix B). All surface water samples were <LLD.

Outside of the owner-controlled area, tritium concentrations were less than the detection limit. Based on the hyrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply. Based on established aquifer flow paths the location most representative of potential offsite release into groundwater was also less than the detection limit.

Strontium No Sr-90 activity was detected in any of the ground water samples analyzed (Table B-11.1, Appendix B).

Gamma Emitters No gamma emitting nuclides were detected (Table B-11.2, Appendix B).

Drinking Water Well Survey A drinking water well survey was conducted during the summer 2006 by CRA (CRA 2006) around the LaSalle County Station. This survey concluded that no residents in the vicinity of the plant utilize the shallow water aquifer as a drinking water supply. Site hydrological studies of aquifer flow and permeation rates from the shallow aquifer to the deep aquifer concluded that there is no feasible dose receptor via a ground water pathway at LaSalle.

D. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and Environmental 179 of 190

Inc. (Midwest Labs) are presented in the AREOR.

E. Leaks, Spills, and Releases No new leaks or spills were discovered through efforts conducted at LaSalle Station. Historical spills were captured in the CSA report as well as the Station's 10CFR75(g) reports.

F. Trends Baseline data established at LaSalle revealed no current ground water issues. On-going monitoring through the RGPP will allow for early detection of any potential threats to groundwater on and around the site.

G. Investigations There were no anomalous result investigations conducted at for LaSalle RGPP sample results in 2008 H. Actions Taken

1. Compensatory Actions There were no required compensatory actions as a result of RGPP monitoring at LaSalle in 2008.

2. Installation of Monitoring Wells No new monitoring wells were added beyond the initial phase for LaSalle in 2008.

3. Actions to Recover/Reverse Plumes 2008 LaSalle RGPP efforts resulted in no required actions.

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APPENDIX A LOCATION DESIGNATION & DISTANCE

Table A-1 LaSalle County Station Groundwater Monitoring Sample Point List Location Current Well Sample No.

Status SW-LS-101 North Storm Water Pond Active SW-LS-102 Active South Storm Water Pond SW-LS- 103 Active Circ Water Discharge Canal SW-LS-104 Active Illinois River Upstream at Seneca (Boondocks)

SW-LS-105 Active Illinois River Downstream at Marseilles (Illini State Park Boat Ramp)

SW-LS- 106 Active Circ Water Intake Bay MW-LS-101S SW Corner of Perimiter Road MW-LS-102S Inactive OLD Parking Lot West (Lake) Side MW-LS-103S Inactive MAF South Centerline MW-LS- 104S Active CY Storage Tanks MW-LS-105S Active Behind IRSF MW-LS-106S Active Spare Transformer Area - Back Toward Security Fence MW-LS-107S Active Old Service Building - Near Outage Trailers MW-LS-108S Inactive Near 12 KV Swithchyard A-1 182 of 190

Sample No. Location Current Well Status MW-LS-109S Inactive Near BDG 33 MW-LS- l l OS Inactive RSH Area by Valve Pit 16B MW-LS-111S West Perimeter Road before pad mounted transformer Active (right hand side)

MW-LS-I 12S Inactive Between perimeter security fences near SE corner.

(Access via security gate east of 12 KV switchyard)

MW-LS-113S Between perimeter security fences near CW intake Inactive bay. (Access via security gate east of 12 KV switchyard)

HP-2 North of tracks near Nuclear Fuel Lay-down Area Active HP-5 Active Near VQ LN2 Storage Tanks HP-7 Active Near UAT's HP-10 Active Near VQ LN2 Storage Tanks, South of HP-5 A-2 183 of 190

APPENDIX A-1 LASALLE COUNTY STATION MAP OF GROUNDWATER MONITORING SAMPLE LOCATIONS

ti UG-S-E'El1E 1 EXELON GENERATION COMPANY, LLC FLEETWIDE TRITIUM ASSESSMENT MONITORING WELL AND SAMPLING LOCATIONS LASALLE GENERATING STATION MARSEILLES, ILLINOIS colomuworen Exel, n. a w^m

=1=2-1 11 ^Vll_lrl=lll -

figure 4.1

APPENDIX B DATA TABLES 186 of 190

TABLE B-1.1 CONCENTRATIONS OF TRITIUM AND STRONIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SR-90 HP-10 04/16/08 < 184 HP-10 09/16/08 < 162 HP-10 09/24/08 < 166 < 1.0 HP-2 05/06/08 < 177 HP-2 09/17/08 < 156 HP-2 09/24/08 < 167 < 1.0 HP-5 04/18/08 < 184 HP-5 09/16/08 < 159 HP-5 09/24/08 < 169 < 0.8 HP-7 05/06/08 < 184 HP-7 09/16/08 < 161 HP-7 09/24/08 < 163 < 0.9 MW-LS-104S 04/18/08 < 189 MW-LS-104S 09/17/08 < 159 MW-LS-104S 09/24/08 < 152 < 0.9 MW-LS-1 05S 06/19/08 632 +/- 126 MW-LS-105S 09/16/08 424 +/- 122 MW-LS-105S 09/23/08 719 +/- 133 < 1.1 MW-LS-106S 04/15/08 < 171 MW-LS-106S 09/18/08 < 162 MW-LS-106S 09/23/08 < 159 < 1.1 MW-LS-107S 04/29/08 < 188 MW-LS-107S 09/17/08 < 149 MW-LS-107S 09/24/08 < 152 < 1.1 MW-LS-111S 04/16/08 < 164 MW-LS-111S 09/18/08 < 160 MW-LS-111S 09/23/08 < 165 < 1.6

TABLE B -I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Be-7 K-40 Mn - 54 Co-58 Fe- 59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD HP-10 09/24/08 < 19 < 32 <1 <2 <4 <1 <2 <2 <3 < 76 <1 <1 < 55 < 15 HP-2 09/24/08 < 13 <7 <1 <1 <3 <1 <2 <1 <2 < 46 <1 <1 < 38 < 10 HP-5 09/24/08 < 17 <9 <1 <1 <4 <1 <2 <2 <3 < 65 <1 <1 < 48 < 15 HP-7 09/24/08 < 11 <8 <1 <1 <3 <1 <2 <1 <2 < 44 <1 <1 < 34 < 12 MW-LS-104S 09/24/08 < 16 49 +/- 27 < 1 <2 <4 <1 <2 <2 <3 < 65 <1 <1 < 49 < 14 MW-LS-105S 09/23/08 < 21 < 10 <1 <2 <5 <1 <3 <2 <4 < 279 <1 <1 < 128 < 32 MW-LS-106S 09/23/08 < 17 67 +/- 24 < 1 <2 <4 <1 <2 <2 <3 < 69 <1 <1 < 48 < 14 MW-LS-107S 09/24/08 < 16 <9 <1 <1 <4 <1 <2 <1 <3 < 66 <1 <1 < 47 < 15 MW-LS-111S 09/23/08 < 16 58 +/- 26 < 1 <1 <4 <1 <2 <2 <3 < 73 <1 <1 < 55 < 15

TABLE B-II.1 CONCENTRATIONS OF TRITIUM AND STRONIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H -3 SR-90 SW-LS-101 04/15/08 < 187 SW-LS-101 09/16/08 < 162 SW-LS-101 09/23/08 < 169 < 1.1 SW-LS-102 04/15/08 < 191 SW-LS-102 09/16/08 < 163 SW-LS-102 09/23/08 < 170 < 1.2 SW-LS-103 04/15/08 < 199 SW-LS-103 09/16/08 < 165 SW-LS-103 09/23/08 < 169 < 1.3 SW-LS-104 04/16/08 < 182 SW-LS-104 09/22/08 < 169 < 1.0 SW-LS-105 04/15/08 < 173 SW-LS-105 09/22/08 < 170 < 1.1 SW-LS-106 04/15/08 < 177 SW-LS-106 09/18/08 < 160 SW-LS-106 09/23/08 < 169 < 0.9

TABLE B-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Be-7 K-40 Mn -54 Co-58 Fe- 59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD SW-LS-101 09/23/08 < 15 < 27 <1 <1 <4 <1 <2 <2 <3 < 57 <1 <1 < 40 < 14 SW-LS-102 09/23/08 < 13 <7 <1 <1 <3 <1 <1 <1 <2 < 56 <1 <1 < 39 < 11 SW-LS-103 09/23/08 < 15 <7 <1 <2 <4 <1 <2 <2 <3 < 60 <1 <1 < 45 < 11 SW-LS-104 09/22/08 < 13 <8 <1 <1 <3 <1 <2 <1 <2 < 56 <1 <1 < 41 < 13 SW-LS-105 09/22/08 < 13 <7 <1 <1 <3 <1 <2 <1 <2 < 53 <1 <1 < 37 < 14 SW-LS-106 09/23/08 < 14 <8 <1 <1 <3 <1 <2 <1 <2 < 56 <1 <1 < 42 < 12