Text

County Station, Units I and 2, 2012 Annual Radiological Environmental Operating Report
	ML13136A007
Person / Time
Site:	LaSalle
Issue date:	05/15/2013
From:	Karaba P; Exelon Generation Co
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	RA13-021
	Download: ML13136A007 (177)
	v • d • e

{{#Wiki_filter:10 CFR 50 Appendix I RA13-021 May 15, 2013 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units I and 2 Facility Operating License Nos. NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374

Subject:

2012 Annual Radiological Environmental Operating Report Enclosed is the Exelon Generation Company, LLC, LaSalle County Station 2012 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. Guy V. Ford, Regulatory Assurance Manager, at (815) 415-2800. Respectfully, Peter J. Karaba Site Vice President LaSalle County Station Attachment cc: Regional Administrator - NRC Region III 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 2012 Prepared By Teledyne Brown Engineering Environmental Services LaSalle County Station Marseilles, IL 61341 May 2013 1 of 176

Table Of Contents

1. Summary and Conclusions ............................................................................................. 1 II. Introduction ..................................................................................................................... 2 A. Objectives of the REMP ...................................................................... ................ 2 B. Implementation of the Objectives ........................................................................ 2 Ill. Program Description ...................................................................................................... 2 A. Sample Collection ............................................................................................... 2 B. Sample Analysis .................................................................................................. 5 C. Data Interpretation .............................................................................................. 5 D. Program Exceptions ............................................................................................ 6 E. Program Changes ............................................................................................... 8 IV. Results and Discussion ................................................................................................. 9 A. Aquatic Environment ........................................................................................... 9 Surface Water 1. ........................................................................................... 9 Ground/Well 2. Water ................................................................................... 9 Fish .........................................................................................................

3. 10

4. Sediment ................................................................................................. 10 B. Atmospheric Environment ................................................................................. 11

1. Airborne ..................................................................................................11

a. Air Particulates .............................................................................11

b. Airborne Iodine ............................................................................ 12

2. Terrestrial ................................................................................................ 12

a. Milk ............................................................................................... 12

b. Food Products ............................................................................. 12 C. Ambient Gamma Radiation ............................................................................... 13 D. Land Use Survey ............................................................................................... 13 E. Summary of Results - Inter-laboratory Comparison Program .......................... 14 i

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Appendices Appendix A Radiological Environmental Monitoring Report Annual Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the LaSalle County Station, 2012 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, 2012 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2012 Figures Figure B-1 Inner Ring OSLD Locations of the LaSalle County Station, 2012 Figure B-2 Outer Ring OSLD Locations and Fixed Air Sampling Locations of the LaSalle County Station, 2012 Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2012 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, 2012. Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-11.1 Concentrations of Tritium in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2012 Table C-11.2 Concentrations of Gamma Emitters in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2012. ii 3of176

Table C-111.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2012. 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, 2012. Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-V1.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-VI 1.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-Vi I.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-VI I1.1 Concentrations of Gamma Emitters in Food Product Samples Collected in the Vicinity of LaSalle County Station, 2012. Table C-IX.1 Quarterly OSLD Results for LaSalle County Station, 2012. Table C-IX.2 Mean Quarterly OSLD Results for the Inner Ring, Outer Ring, Other and Control Locations for LaSalle County Station, 2012. Table C-1X.3 Summary of the Ambient Dosimetry Program for LaSalle County Station, 2012. Figures Figure C-1 Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2012. Figure C-2 Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2012. Figure C-3 Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2005 - 2012. Figure C-4 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2005 - 2012. Figure C-5 Air Particulate - Gross Beta - Station L-10 (C) Collected in the Vicinity of LSCS, 2005 - 2012. Figure C-6 Air Particulate - Gross Beta - Station L-04 and L-07 Collected in the Vicinity of LSCS, 2005 - 2012. III 4of176

Figure C-7 Air Particulate - Gross Beta - Station L-08 and L-1 1 Collected in the Vicinity of LSCS, 2005 - 2012. Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2012 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2012 Table D-3 DOE's Mixed Analyte Performance Evaluation Program (MAPEP) Teledyne Brown Engineering, 2012 Table D-4 ERA Statistical Summary Proficiency Testing Program Environmental, Inc., 2012 Table D-5 DOE's Mixed Analyte Performance Evaluation Program (MAPEP) Environmental, Inc., 2012 Appendix E Effluent Data Appendix F Meteorological Data Appendix G Annual Radiological Groundwater Protection Program Report (ARGPPR) iv 5of176

Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the LaSalle County Station (LSCS) by Exelon covers the period 1 January 2012 through 31 December 2012. During that time period, 1,460 analyses were performed on 1,361 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of LSCS 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. 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 for 1-131. 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 Optically Stimulated Luminescence Dosimeters (OSLD). Beginning in the first quarter of 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimetry were deployed and Thermo-luminescent Dosimetry (TLD) were discontinued. This change may result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid. OSLD technology is different than that used in a TLD but has the same purpose (to measure direct radiation). 1 6of176

II. Introduction The LaSalle County Station (LSCS), consists of two boiling water reactors, each rated for 3,546 MWt. Both units are owned and operated by Exelon Corporation and are located in LaSalle County, Illinois. Unit 1 went critical on 16 March 1982. Unit 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 LSCS 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) and Landauer on samples collected during the period 1 January 2012 through 31 December 2012. 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.

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 LSCS REMP were collected for Exelon Nuclear by Environmental Inc. (Midwest Labs). This section describes the general 7of176

collection methods used by Environmental Inc. (Midwest Labs) to obtain environmental samples for the LSCS REMP in 2012. 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 via grab sample. The samples were then transferred to new unused plastic containers. Both the grab container and the sample containers were rinsed with source water prior to actual sample collection. Fish samples 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 airborne particulate and iodine. Airborne particulate and iodine 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 particulate and iodine samples were obtained at each location, using a vacuum pump to pull air through a glass fiber particulate filter and iodine cartridge. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The particulate filters and iodine cartridges were replaced weekly and sent to the laboratory for analysis. Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on samples of milk and food product. Samples were collected biweekly at one milk 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

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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. Ambient Gamma Radiation Beginning in the first quarter of 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimetry (OSLD) were deployed and Thermo-luminescent Dosimetry (TLD) were discontinued. This change may cause step changes in readings, up or down, depending on site characteristics. However, the relative comparison to control locations remains valid. OSLD technology is different than that used in a TLD but has the same purpose (to measure direct radiation). Each location consisted of 2 OSLD sets. The OSLDs were exchanged quarterly and sent to Landauer for analysis. The OSLD locations were placed on and around the LSCS site as follows: An inner ring consisting of 16 locations (L-101, L-102, L-103, L-104, 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 LSCS 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-21 1, 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 nearby 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 OSLD 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 % degree sectors around the site, where estimated annual dose from LSCS, if any, would be most significant;

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

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

(Two OSLDs were placed at each location approximately six feet above ground level.) B. Sample Analysis This section describes the general analytical methodologies used by TBE and Environmental Inc. (Midwest Labs) to analyze the environmental samples for radioactivity for the LSCS REMP in 2012. 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) is 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 is intended as a before the fact (a priori) estimate of a system (including instrumentation, 0 of 176

procedure and sample type) and not as an after the fact (a posteriori) criteria for the presence of activity. All analyses were designed to achieve the required LSCS 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.

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. Program Exceptions For 2012, the LSCS 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-08 02/09/12 Estimated reading of 168.0 hours; collector replaced timer.

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Table D-1 LISTING OF SAMPLE ANOMALIES (continued) Sample Location Collection Reason Type Code Date A/I L-03 03/01/12 No apparent reason for low reading of 161.2 hours. Low timer readings of this nature are consistent with weather related power interruptions. All L-11 03/01/12 No apparent reason for low reading of 166.3 hours. Low timer readings of this nature are consistent with weather related power interruptions. All L-07 04/12/12 No apparent reason for low reading of 164.0 hours. Low timer readings of this nature are consistent with weather related power interruptions. All L-04 05/ 10/12 Low reading of 81.0 hours; no power; collector replaced fuse. A/I L-05 05/10/12 Low reading of 71. 0 hours; no electricity to sampler; station notified. A/I L-06 05/10/12 Low reading of 80.1 hours; no power; collector replaced fuse. A/I L-08 05/ 10/12 Low reading of 65 .7 hours; no power; collector replaced fuse. A/I L-05 05/17/12 Low reading of 110.1 hours due to recent power restoration on 05-11-12, 17:00. A/I L-05 05/31/12 No apparent reason for low reading of 164.9 hours. Low timer readings of this nature are consistent with weather related power interruptions. A/I L-05 06/28/12 No apparent reason for low reading of 162.0 hours. Low timer readings of this nature are consistent with weather related power interruptions. A/I L-01 07/05/12 No apparent reason for low reading of 152.0 hours. Low timer readings of this nature are consistent with weather related power interruptions. 7 12 of 176

Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date OSLD L105-1 03/29/12 1st Qtr. missing in field at quarterly exchange. OSLD L115-2 03/29/12 is' Qtr. missing in field at quarterly exchange. OSLD L112-1 03/29/12 The OSLD was inadvertently left out of shipment to the lab. The OSLD was read at the end of the second quarter. The data is invalid OSLD L207-2 03/29/12 1st Qtr. missing in field at quarterly exchange. OSLD L216-3 03/29/12 ist Qtr. missing in field at quarterly exchange. OSLD L05-1 04/19/12 OSLD missing during weekly visual check. OSLD L05-1 04/26/12 Collector could not locate missing dosimeter; placed spare. OSLD L112-2 06/28/12 No data was available for the OSLD. 3rd OSLD L116-1 09/27/12 Qtr. missing in field at quarterly exchange. OSLD L204-2 12/06/12 4th Qtr. missing in field; new utility pole in place. Collector placed spare. Data is invalid 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. Program Changes There were no changes to the program in 2012. 13 of 176

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 22 of 24 samples with a range of 5.9 to 10.4 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 five of eight samples. The concentrations ranged from 183 to 1,150 pCi/I. Concentrations detected were consistent with those detected in previous years through the first three quarters. Fourth quarter control and indicator sample results were both slightly higher than previous years. However, because both control and indicator results were statistically equivalent, the elevated results were not attributed to LaSalle effluent releases (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 and 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:

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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. Fish 3. Fish samples 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 2,400 to 3,630 pCi/kg wet. No fission or activation products were found. Sediment 4. 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. Potassium-40 was found at all stations and ranged from 11,600 to 19,700 pCi/kg dry. No LaSalle fission or activation products were found. 15 of 176

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 LSCS site boundary (L-03 and L-05),

Group I I (near site) represents the locations near the LSCS site (L-01 and L-06), Group I I I (far field) represents the control location at an intermediate distance from LSCS (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 determining the effects, if any, resulting from the operation of LSCS. The results from the OnSite locations (Group I) ranged from 6 to 44 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3. The results from the near site location (Group II) ranged from 8 to 48 E-3 pCi/m3 with a mean of 21 E-3 pCi/m3. The results from the far field locations (Group III) ranged from 6 to 47 E-3 pCi/m3 with a mean of 21 E-3 pCi/m3. The results from the Control location (Group IV) ranged from 9 to 49 E-3 pCi/m3 with a mean of 21 E-3 pCi/m3. Comparison of the 2012 air particulate data with previous years data indicate no effects from the operation of LSCS (Figures C-3 through C-7, Appendix C). In addition, comparisons of the weekly mean values for 2012 indicate no notable differences among the four 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 all samples. These values ranged from 100 to 218 E-3 pCi/m3. Naturally occurring K-40 was not detected in any samples. All other nuclides were less than the MDC. 16 of 176

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-VI. 1, Appendix C). No 1-131 was detected. 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. Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VlI.2, Appendix C). Naturally occurring K-40 activity was found in all samples and ranged from 1,170 to 1,420 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-VIll.1, Appendix C). No nuclides were detected, and all required LLDs were met. 17 of 176

C. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Optically Stimulated Luminescence Dosimeters (OSLD). Forty-one OSLD locations were established around the site. Results of OSLD measurements are listed in Tables C-IX.1 to C-IX.3, Appendix C. All OSLD measurements were below 30 mrem/quarter, with a range of 12.3 to 29.8 mrem/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 2012 growing season around the LaSalle County Station (LSCS) 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 and direction of all locations from the LSCS reactor buildings were positioned using Global Positioning System (GPS) technology. There were no changes required to the LSCS REMP as a result of this survey. The results of this survey are summarized below. Distance in Miles from the LSCS 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 - 14.2 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 - N W 1.5 3.0 - P WNW 0.9 3.0 - Q NW 1.8 4.0 - R NNW 1.7 4.6 - 18 of 176

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.

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 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 TBE laboratory, 12 out of 18 analytes met the specified acceptance criteria. Six analytes (Co-60, Gross Alpha, Gross Beta, Sr-89, Sr-90 and Zn-65) did not meet the specified acceptance criteria for the following reason: 19 of 176

Teledyne Brown Engineering's MAPEP March 2012 Co-60 in soil result of 7.61 Bq/kg was higher than the known value of 1.56 Bq/kg, resulting in a found to known ratio of 4.88 on a sensitivity evaluation. NCR 12-08 was initiated to investigate this failure. No cause could be found for the failure. TBE is monitoring the Co-60 in soil analyses on a case-to-case basis. Sensitivity evaluations are primarily a qualitative assessment. Since Cobalt-60 was not observed in any Radiological Environmental Monitoring Program (REMP) samples, there was no impact to client samples as a result of this issue.

2. Teledyne Brown Engineering's MAPEP March 2012 Zn-65 in AP result of 4.19 Bq/sample was higher than the known value of 2.99 Bq/sample, exceeding the upper control limit of 3.89 Bq/sample.

NCR 12-08 was initiated to investigate this failure. No cause could be found for the failure and is considered an anomaly specific to the MAPEP sample. The first and second quarter 2012 Analytics AP Zn-65 analyses were acceptable. Since Zn-65 was not present in any REMP samples, there was no impact to client samples as a result of this issue.

3. Teledyne Brown Engineering's MAPEP September 2012 Sr-90 in water result of 19.6 pCi/L was higher than the known value of 12.2 pCi/L, exceeding the upper control limit of 15.9 pCi/L. NCR 12-11 was initiated to investigate this failure. An incorrect aliquot was entered into LIMS. Using the correct aliquot, the result would have fallen within the acceptance range. The failure was specific to the sample, therefore there was no impact to client samples as a result of this issue.

4. Teledyne Brown Engineering's ERA May 2012 Gross Alpha in water result of 82.4 pCi/L was higher than the known value of 62.9 pCi/L, which exceeded the upper control limit of 78.0 pCi/L. NCR 12-05 was initiated to investigate this failure. The G-1 detector is slightly biased high for Th-230 based measurements. The G-1 detector is used only for ERA samples. The detector was recalibrated. The failure was specific to the ERA sample, therefore there was no impact to client samples as a result of this issue.

5. Teledyne Brown Engineering's ERA November 2012 Gross Beta in water result of 59.3 pCi/L was higher than the known value of 39.2 pCi/L, which exceeded the upper control limit of 46.7 pCi/L. NCR 12-13 was initiated to investigate this failure. The rerun result of 44.8 fell within the control limits. It appears an incorrect aliquot was entered into LIMS. The failure was specific to the ERA sample, 20 of 176

therefore there was no impact to client samples as a result of this issue.

6. Teledyne Brown Engineering's ERA November 2012 Sr-89 in water result of 46.5 pCi/L was higher than the known value of 39 .1 pCi/L, which exceeded the upper control limit of 46 .1 pCi/L. NCR 12-13 was initiated to investigate this failure. The found to known ratio was 1.19, which TBE considers acceptable with warning, therefore there was no impact to client samples as a result of this issue.

For the EIML laboratory, 12 out of 14 analytes met the specified acceptance criteria. Two analytes (Gross Beta and Co-57) did not meet the specified acceptance criteria for the following reason: 1 Environmental Inc., Midwest Laboratory's ERA April 2012 GrossBeta in water result of 76.2 pCi/L was higher than the known value of 44.2 pCi/L, exceeding the upper control limit of 51.5 pCi/L. The reanalyzed result of 38.3 fell within the control limits. A sample dilution problem was suspected. The failure was specific to the ERA sample, therefore there was no impact to client samples as a result of this issue.

2. Environmental Inc., Midwest Laboratory's MAPEP August 2012 Co-57 in vegetation result of 7.44 pCi/L was higher than the known value of 5.66 pCi/L, exceeding the upper control limit of 7.36 pCi/L.

The reanalyzed result of 6.74 fell within the control limits. The sample was recounted using a geometry more closely matched to the MAPEP sample size. The failure was specific to the MAPEP sample, therefore there was no impact to client samples as a result of this issue. The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data. 21 of 176

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 7.8 8.2 8.2 L-21 CONTROL 0 (PCI/LITER) (11/12) (11/12) (11/12) ILLINOIS RIVER AT SENECA - UPSTREAM (6.3/10.4) (5.9/10.3) (5.9/103) 4.0 MILES NE OF SITE 1-1-3 8 200 542 797 797 L-21 CONTROL 0 (3/4) (2/4) (2/4) ILLINOIS RIVER AT SENECA - UPSTREAM (183/1150) (543/1050) (543/1050) 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 NB-95 15 <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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 ZR-95 30 <LLD <LLD 0 (PCI/LITER) 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 (PCI/LITER) GAMMA 12 MN-54 15 <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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 CO-58 15 <LLD <LLD 0 (PCI/LITER) 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 CS-134 IS <LLD <LLD 0 CS-137 18 <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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 BA-140 60 <LLD <LLD 0 (PCI/LITER) 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 CO-60 130 <LLD <LLD 0 ZN-65 260 <LLD <LLD 0 NB-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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M) LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (NI) 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 ZR-95 NA <LLD <LLD 0 (PCUKG WET) CS-134 130 <LLD <LLD 0 CS-137 150 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 SEDIMENT GAMMA 6 (PCUKG DRY) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 CO-60 NA <LLD <LLD 0 (PCUKG DRY) ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 CS-134 150 <LLD <LLD 0 CS-137 180 <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-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 PATI-IWAY 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 GR-B 477 10 21 21 22 L-01 INDICATOR 0 (E-3 PCI/CU.METER) (422/424) (53/53) (53/53) NEARSITE 1 (6/48) (9/49) (8/47) 1.5 MILES NNW OF SITE GAMMA 36 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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 CS-134 50 <LLD <LLD 0 (E-3 PCI/CU.METER) CS-137 60 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 AIR IODINE GAMMA 477 (E-3 PCI/CU.METER) I-131 70 <LLD <LLD 0 MILK 1-131 19 1 NA <LLD 0 (PCI/LITER) GAMMA 19 MN-54 NA NA <LLD - 0 CO-58 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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 FE-59 NA NA <LLD 0 (PCI/LITER) CO-60 NA NA <LLD 0 ZN-65 NA NA <LLD 0 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 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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 LA-140 15 NA <LLD 0 (PCI/LITER) VEGETATION GAMMA 10 (PCUKG 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, 2012 NAME OF FACILITY: LASALLE DOCKET NUMBER: 50-373 & 50-374 2012 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: ANNUAL 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 OSLD-QUARTERLY 324 NA 22.3 20.4 27.2 L-105-1 INDICATOR 0 (IMIREM/QUARTER) (316/316) (8/8) (3/3) (12.3/29.8) (13.9/24.0) (24.8/29.8) 0.7 MILES E

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 34 of 176

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2012 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 NNW L-28-W5 Marseilles Well (control) 6.7 miles NNW L-28-W6 Marseilles Well (indicator) 4.1 miles N 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 W 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 NNW L-36 Illinois River, Upstream of Discharge (control) 4.3 miles NE 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 N 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 35 of 176 B-1

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2012 Location Location Description Distance & Direction From Site H. Environmental Dosimetry - OSLD 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-110-1 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 W 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 W 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 (indicator) 6.0 miles S Control and Special Interest L-10-1 and -2 Streator 13.5 miles SW 36 of 176 B-2

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2012 Sam p le Medium Anal ysis Sam pling Method Analytical Procedure Number Surface Water Gamma Monthly composite TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy from weekly grab samples. Env. Inc., GS-01 Determination of gamma emitters by gamma s pectrosco py 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 g ross 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 Quarterly grab TBE, TBE -2007 Gamma emitting radioisotope analysis Spectroscopy samples. Env. Inc., GS-01 Determination of gamma emitters by g amma s pectrosco py Ground/Well Water Tritium Quarterly grab TBE, TBE-2011 Tritium analysis in drinking water by liquid samples. scintillation Env. Inc., T-02 Determination of tritium in water (direct method) Fish Gamma Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis Spectroscopy collected via electroshocking or Env. Inc., GS-01 Determination of gamma emitters by other techni q ues gamma s pectrosco py Sediment Gamma Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy samples Env. Inc., GS-01 Determination of gamma emitters by g amma s pectrosco py Air Particulates Gross Beta One-week composite TBE, TBE-2008 Gross Alpha and/or gross beta activity in of continuous air various matrices sampling through glass fiber filter paper Env. Inc., AP-02 Determination of gross alpha and/or g ross beta in air particulate filters Air Particulates Gamma Quarterly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy each station Env. Inc., GS-01 Determination of gamma emitters by gamma s pectrosco py Air Iodine Gamma Bi-weekly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy continuous air sampling through Env. Inc., 1-131-02 Determination of 1-131 in charcoal charcoal filter canisters by g amma s pectrosco py (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 an other times ion exchan ge Milk Gamma Bi -weekly grab sample TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy when cows are on pasture. Monthly all Env. Inc., GS-01 Determination of gamma emitters by other times gamma s pectrosco py Food Products Gamma Annual grab samples. TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Env. Inc., GS-01 Determination of gamma emitters by gamma spectrosco py OSLD Optically Stimulated Quarterly OSLDs Landauer Incorporated Luminescence comprised of two Dosimetry A1203:C Landauer Incorporated elements. 37 of 176 B-3

Figure B-1 Inner Ring OSLD Locations of the LaSalle County Station, 2012

Figure B-2 Outer Ring OSLD Locations and Fixed Air Sampling Locations of the LaSalle County Station, 2012 39 of 176 B-5

Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2012 40 of 176 B-6

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, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-21 L-40 PERIOD 01/05/12 - 01/26/12 6.1 +/- 1.6 6.3 +/- 1.6 02/02/12 - 02/23/12 6.8 +/- 1.9 7.6 +/- 1.9 03/01/12 - 03/29/12 7.3 +/- 2.8 6.8 +/- 2.8 04/05/12 - 04/26/12 < 3.9 < 3.9 05/03/12 - 05/31/12 5.9 +/- 1.5 7.3 +/- 1.6 06/07/12 - 06/28/12 7.9 +/- 1.7 7.5 +/- 1.7 07/05/12 - 07/26/12 8.7 +/- 1.9 7.3 +/- 1.6 08/02/12 - 08/30/12 9.1 +/- 1.9 8.8 +/- 1.9 09/06/12 - 09/27/12 8.2 +/- 1.7 8.1 +/- 1.6 10/04/12 - 10/25/12 10.1 +/- 1.8 8.3 +/- 1.7 11/01/12 - 11/29/12 10.3 +/- 1.9 10.4 +/- 1.9 12/06/12 - 12/27/12 9.4 +/- 2.1 7.6 +/- 1.9 MEAN* 8.16 +/- 3 7. 81 +/- 2.2 TABLE C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-21 L-40 PERIOD 01/05/12 - 03/29/12 < 173 183 +/- 115 04/05/12 - 06/28/12 543 +/- 124 294 +/- 109 07/05/12 - 09/27/12 < 177 < 179 10/04/12 - 12/27/12 1050 +/- 169 1150 +/- 178 MEAN* 797 +/- 717 542 +/- 1058 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-1 42 of 176

TABLE C -1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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 01/05/12 - 01/26/12 <2 <3 <8 <3 <6 <3 <6 < 13 <3 <3 < 24 <8 02/02/12 - 02/23/12 <1 <2 <3 <1 <3 <2 <3 < 10 <1 <2 < 18 <6 03/01/12 - 03/29/12 <2 <2 <4 <2 <3 <2 <3 < 11 <2 <2 <17 <6 04/05/12 - 04/26/12 <2 <2 <5 <2 <4 <2 <4 < 14 <2 <2 < 22 <7 05/03/12 -05/31/12 <1 <2 <4 <1 <3 <2 <3 <14 <1 <2 <21 <6 06/07/12 - 06/28/12 <2 <2 <6 <2 <4 <2 <4 < 15 <2 <2 < 23 <8 07/05/12 -07/26/12 <2 <2 <5 <2 <3 <2 <3 <13 <2 <2 <21 <7 08/02/12 - 08/30/12 <1 <2 <4 <2 <3 <2 <3 < 13 <1 <2 < 19 <6 09/06/12 - 09/27/12 <2 <2 <4 <1 <3 <2 <3 < 14 <2 <2 < 21 <4 10/04/12 - 10/25/12 <1 <2 <4 <1 <3 <2 <3 < 10 <1 <1 < 16 <4 11/01/12 - 11/29/12 <1 <2 <4 <1 <3 <2 <3 < 13 <1 <1 < 19 <7 12/06/12 - 12/27/12 <1 <2 <4 <1 <3 <2 <3 < 11 <1 <2 < 17 <5 MEAN L-40 01/05/12 - 01/26/12 <2 <2 <5 <2 <4 <2 <4 <9 <2 <2 < 17 <6 02/02/12 - 02/23/12 <1 <2 <4 <2 <3 <2 <4 < 12 <2 <2 < 19 <5 03/01/12 - 03/29/12 <1 <2 <4 <1 <3 <1 <3 <8 <1 <1 < 14 <5 04/05/12 - 04/26/12 <2 <2 <5 <2 <4 <2 <4 < 14 <2 <2 < 23 <6 05/03/12 - 05/31/12 <2 <2 <4 <1 <3 <2 <3 < 15 <2 <2 < 22 <7 06/07/12 - 06/28/12 <2 <2 <5 <2 <4 <2 <4 < 14 <2 <2 < 21 <7 07/05/12 - 07/26/12 <2 <2 <4 <2 <3 <2 <3 < 13 <2 <2 < 20 <6 08/02/12 - 08/30/12 <1 <2 <4 <1 <3 <2 <3 < 12 <1 <1 < 17 <6 09/06/12 - 09/27/12 <2 <2 <5 <2 <4 <2 <4 < 12 <2 <2 < 21 <8 10/04/12 - 10/25/12 <1 <2 <4 <2 <3 <2 <3 <9 <1 <2 < 16 <6 11/01/12 - 11/29/12 <1 <1 <3 <1 <2 <1 <3 < 11 <1 <1 < 17 <5 12/06/12 - 12/27/12 <1 <1 <3 <1 <2 <1 <2 <7 <1 <1 <12 <4 MEAN

TABLE C - I1.1 CONCENTRATIONS OF TRITIUM IN GROUNDIWELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-27 L-28-W4 L-28-W5 L-28-W6 PERIOD 01/12/12 - 01/12/12 < 184 < 181 < 181 04/12/12 - 04/12/12 < 170 < 170 < 168 07/12/12 - 07/12/12 < 160 < 160 < 160 10/11/12 - 10/11/12 < 160 < 161 < 160 MEAN

TABLE C-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND /WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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 01/12/12 - 01/12/12 <6 <7 < 12 <6 < 11 <7 < 12 <6 <5 < 37 < 12 04/12/12 - 04/12/12 <4 <4 <7 <4 <8 <4 <7 <3 <4 <22 <6 07/12/12 -07/12/12 <3 <3 <7 <4 <7 <4 <5 <3 <4 <15 <6 10/11/12 - 10/11/12 <5 <6 < 10 <6 < 13 <7 < 11 <5 <6 < 37 < 11 MEAN L-28-W4 01/12/12 - 01/12/12 <5 <4 < 13 <6 < 10 <6 <7 <5 <6 < 28 < 11 07/12/12 - 07/12/12 <4 <4 <8 <5 <8 <4 <8 <4 <5 < 26 <8 10/11/12 - 10/11/12 <4 <6 < 10 <5 < 11 <6 <8 <4 <5 < 30 < 12 MEAN - - - - - - - - - - - L-28-W5 04/12/12 - 04/12/12 <5 <5 <9 <3 < 12 <5 <9 <5 <6 < 34 < 11 MEAN - - L-28-W6 01/12/12 - 01/12/12 <5 <7 < 13 <6 <9 <5 <8 <4 < 5 < 37 < 12 04/12/12 - 04/12/12 <5 <4 <8 <5 < 13 <3 <9 <4 < 4 < 25 <7 07/12/12 - 07/12/12 <3 <4 <8 <4 <8 <4 <8 <4 < 4 < 23 <6 10/11/12 - 10/11/12 <4 <4 <8 <4 <7 <5 <7 <3 < 4 < 25 <7 MEAN

TABLE C-II1.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PC/KG WET +/- 2 SIGMA SITE 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 Blue catfish 05/09/12 < 38 < 27 < 64 < 30 < 68 < 40 < 56 < 36 < 34 < 263 < 100 Common Carp 05/09/12 < 45 < 36 < 111 < 54 < 107 < 53 < 63 < 46 < 49 < 355 < 96 Common Carp 10/03/12 < 54 < 46 < 144 < 44 < 92 < 48 < 100 < 43 < 42 < 502 < 169 Largemouth Bass 10/03/12 < 60 < 88 < 199 < 70 < 144 < 81 < 135 < 72 < 70 < 918 < 213 MEAN L-35 Freshwater Drum 05/09/12 < 56 < 59 < 112 < 52 < 83 < 57 < 80 < 49 < 64 < 418 < 126 Smallmouth Buffalo 05/09/12 < 42 < 42 < 103 < 57 < 97 < 45 < 78 < 39 < 43 < 310 < 115 Channel Catfish 10/03/12 < 52 < 59 < 131 < 58 < 85 < 61 < 95 < 48 < 43 < 647 < 172 Smallmouth Buffalo 10/03/12 < 82 < 99 < 243 < 78 < 184 < 115 < 182 < 73 < 104 < 860 < 327 MEAN L-36 Channel Catfish 05/09/12 < 63 < 73 < 180 < 80 < 148 < 74 < 120 < 57 < 60 < 442 < 160 Freshwater Drum 05/09/12 < 36 < 38 < 80 < 37 < 76 < 40 < 67 < 36 < 37 < 290 < 79 Channel Catfish 10/03/12 < 55 < 53 < 134 < 53 < 106 < 64 < 102 < 52 < 40 < 626 < 230 Smallmouth Buffalo 10/03/12 < 66 < 64 < 137 < 56 < 132 < 86 < 92 < 52 < 64 < 756 < 177 MEAN

TABLE C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PC/KG DRY +/- 2 SIGMA SITE 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 05/10/12 < 64 < 77 < 168 < 73 < 165 < 83 < 132 < 62 < 71 < 860 < 320 10/04/12 < 65 < 71 < 187 < 81 < 159 < 93 < 132 < 61 < 89 < 765 < 143 MEAN L-40 05/10/12 < 56 < 56 < 134 < 64 < 126 < 72 < 111 < 55 < 76 < 387 < 119 10/04/12 < 38 < 41 < 95 < 52 < 98 < 43 < 72 < 34 < 38 < 376 < 127 MEAN L-41 05/10/12 < 37 < 34 < 101 < 51 < 86 < 37 < 65 < 35 < 43 < 222 < 68 10/04/12 < 39 < 43 < 117 < 55 < 113 < 56 < 94 < 35 < 52 < 429 < 126 MEAN

TABLE C -V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 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 22 12/29/11 - 01/05/12 16 +/- 4 +/- 18 +/- 4 5 19 +/- 4 15 +/- +/- 4 23 +/- 5 16 +/- 4 -T4-+/--4 01/05/12 - 01/12/12 24 +/- 5 20 +/- 4 22 +/- 5 22 +/- 5 23 +/- 5 21 +/- 5 21 +/- 4 24 +/- 5 27 +/- 5 01/12/12 - 01/19/12 20 +/- 4 24 +/- 5 28 +/- 5 24 +/- 4 22 +/- 4 19 +/- 4 22 +/- 4 20 +/- 4 21 +/- 4 01/19/12 -01/26/12 27+/-5 26+/-5 27+/-5 20+/-4 25+/-5 26+/-5 27+/-5 27+/-5 25+/-5 01/26/12 - 02/02/12 16 +/- 4 17 +/- 4 18 +/- 4 18 +/- 4 17 +/- 4 20 +/- 4 16 +/- 4 14 +/- 4 17 +/- 4 02/02/12 - 02/09/12 16 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 17 +/- 4 17 +/- 4 19 +/- 4 (1) 17 +/- 4 20 +/- 4 02/09/12 - 02/16/12 15 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 16 +/- 4 17 +/- 4 17 +/- 4 18 +/- 4 18 +/- 4 02/16/12 - 02/23/12 18 +/- 4 17 +/- 4 19 +/- 4 19 +/- 4 11 +/- 4 16 +/- 4 20 +/- 5 16 +/- 4 22 +/- 5 02/23/12 - 03/01/12 24 +/- 5 (1) 22 +/- 5 21 +/- 5 22 +/- 5 14 +/- 5 22 +/- 5 25 +/- 5 23 +/- 5 (1) 19 +/- 5 03/01/12 - 03/08/12 16 +/- 5 15 +/- 5 18 +/- 5 21 +/- 5 15 +/- 5 18 +/- 5 18 +/- 5 19 +/- 5 15 +/- 5 03/08/12 - 03/15/12 22 +/- 5 21 +/- 5 17 +/- 5 19 +/- 5 20 +/- 5 14 +/- 5 18 +/- 5 17 +/- 5 22 +/- 5 03/15/12 - 03/22/12 15 +/- 3 11 +/- 3 15 +/- 3 13 +/- 3 12 +/- 3 13 +/- 3 16 +/- 3 12 +/- 3 13 +/- 3 03/22/12 - 03/29/12 15 +/- 4 14 +/- 4 15 +/- 4 16 +/- 4 13 +/- 4 16 +/- 4 15 +/- 4 14 +/- 4 14 +/- 4 03/29/12 - 04/05/12 10 +/- 4 12 +/- 4 12 +/- 4 12 +/- 4 11 +/- 4 10 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 04/05/12 - 04/12/12 13 +/- 4 13 +/- 4 17 +/- 4 15 +/- 4 12 +/- 4 13 +/- 4 (1) 19 +/- 4 14 +/- 4 15 +/- 4 04/12/12 - 04/19/12 20 +/- 4 16 +/- 4 18 +/- 4 19 +/- 4 19 +/- 4 17 +/- 4 16 +/- 4 14 +/- 4 21 +/- 4 04/19/12 - 04/26/12 14 +/- 4 16 +/- 4 15 +/- 4 18 +/- 5 15 +/- 4 14 +/- 4 15 +/- 4 13 +/- 4 15 +/- 4 04/26/12 - 05/03/12 17 +/- 5 20 +/- 5 17 +/- 5 18 +/- 5 20 +/- 5 17 +/- 5 <5 18 +/- 5 22 +/- 5 05/03/12 - 05/10/12 6+/-3 12 +/- 4 (1) 12 +/- 3 <9 (1) 14 +/- 6 (1) 6 +/- 3 10 +/- 4 (1) 10 +/- 3 9+/-3 05/10/12 - 05/17/12 12 +/- 4 14 +/- 6 (1) 15 +/- 4 19 +/- 5 13 +/- 4 15 +/- 4 13 +/- 4 14 +/- 4 11 +/- 4 05/17/12 - 05/24/12 17 +/- 4 19 +/- 4 25 +/- 5 16 +/- 4 21 +/- 4 19 +/- 4 20 +/- 4 16 +/- 4 24 +/- 5 05/24/12 - 05/31/12 16 +/- 4 13 +/- 4 (1) 21 +/- 5 15 +/- 4 17 +/- 4 20 +/- 4 16 +/- 4 17 +/- 4 17 +/- 4 05/31/12 - 06/07/12 11 +/- 4 13 +/- 4 8+/-3 14 +/- 4 14 +/- 4 8+/-4 16 +/- 4 12 +/- 4 12 +/- 4 06/07/12 - 06/14/12 15 +/- 4 15 +/- 4 17 +/- 4 17 +/- 4 16 +/- 4 18 +/- 4 17 +/- 4 17 +/- 4 13 +/- 4 06/14/12 - 06/21/12 15 +/- 4 15 +/- 4 16 +/- 4 18 +/- 4 17 +/- 4 17 +/- 4 18 +/- 4 16 +/- 4 16 +/- 4 06/21/12 - 06/28/12 14 +/- 4 15 +/- 4 (1) 14 +/- 4 19 +/- 4 18 +/- 4 16 +/- 4 16 +/- 4 18 +/- 4 17 +/- 4 06/28/12 - 07/05/12 28 +/- 5 28 +/- 5 31 +/- 6 (1) 10 +/- 4 25 +/- 5 31 +/- 5 35 +/- 5 25 +/- 5 27 +/- 5 07/05/12 - 07/12/12 18 +/- 4 15 +/- 4 22 +/- 5 18 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 18 +/- 4 20 +/- 4 07/12/12 -07/19/12 19+/-5 15+/-5 17+/-5 22+/-5 20+/-5 19+/-5 18+/-5 17+/-5 20+/-5 07/19/12 - 07/26/12 21 +/- 5 14 +/- 4 24 +/- 5 18 +/- 5 23 +/- 5 20 +/- 5 21 +/- 5 18 +/- 5 20 +/- 5 07/26/12 - 08/02/12 22 +/- 5 21 +/- 5 25 +/- 5 21 +/- 4 19 +/- 4 25 +/- 5 21 +/- 4 18 +/- 4 18 +/- 4 08/02/12 - 08/09/12 27 +/- 5 20 +/- 4 25 +/- 5 24 +/- 5 27 +/- 5 28 +/- 5 26 +/- 5 29 +/- 5 26 +/- 5 08/09/12 - 08/16/12 17 +/- 4 19 +/- 4 21 +/- 5 22 +/- 5 17 +/- 4 21 +/- 5 18 +/- 4 22 +/- 5 25 +/- 5 08/16/12 - 08/23/12 16 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 24 +/- 5 18 +/- 4 19 +/- 4 19 +/- 4 22 +/- 5 08/23/12 - 08/30/12 25 +/- 5 26 +/- 5 31 +/- 5 30 +/- 5 31 +/- 5 35 +/- 6 28 +/- 5 26 +/- 5 31 +/- 5 08/30/12 - 09/06/12 21 +/- 4 22 +/- 4 23 +/- 4 25 +/- 5 24 +/- 5 24 +/- 5 23 +/- 4 20 +/- 4 20 +/- 4 09/06/12 - 09/13/12 21 +/- 5 18 +/- 4 23 +/- 5 22 +/- 5 17 +/- 4 25 +/- 5 23 +/- 5 18 +/- 4 22 +/- 5 09/13/12 - 09/20/12 21 +/- 4 22 +/- 4 21 +/- 4 22 +/- 4 19 +/- 4 23 +/- 4 28 +/- 5 25 +/- 5 22 +/- 4 09/20/12 - 09/27/12 20 +/- 4 25 +/- 5 23 +/- 5 19 +/- 4 18 +/- 4 19 +/- 4 20 +/- 4 22 +/- 5 25 +/- 5 09/27/12 - 10/04/12 18 +/- 5 19 +/- 5 24 +/- 5 26 +/- 5 19 +/- 5 20 +/- 5 22 +/- 5 24 +/- 5 27 +/- 5 10/04/12 - 10/11/12 17 +/- 4 20 +/- 5 17 +/- 4 19 +/- 5 13 +/- 4 13 +/- 4 17 +/- 4 14 +/- 4 13 +/- 4 10/11/12 - 10/18/12 25 +/- 5 24 +/- 5 24 +/- 5 29 +/- 5 27 +/- 5 27 +/- 5 32 +/- 6 26 +/- 5 24 +/- 5 10/18/12 - 10/25/12 21 +/- 5 20 +/- 5 17 +/- 5 22 +/- 5 16 +/- 5 20 +/- 5 20 +/- 5 20 +/- 5 24 +/- 5 10/25/12 - 11/01/12 14 +/- 4 17 +/- 4 16 +/- 4 13 +/- 4 13 +/- 4 13 +/- 4 14 +/- 4 14 +/- 4 14 +/- 4 11/01/12 - 11/08/12 15 +/- 4 17 +/- 4 17 +/- 5 14 +/- 4 14 +/- 4 20 +/- 5 17 +/- 4 14 +/- 4 18 +/- 5 11/08/12 - 11/15/12 21 +/- 5 24 +/- 5 25 +/- 5 21 +/- 5 23 +/- 5 22 +/- 5 23 +/- 5 24 +/- 5 23 +/- 5 11/15/12 - 11/21/12 35 +/- 6 40 +/- 6 44 +/- 7 48 +/- 7 39 +/- 6 46 +/- 7 43 +/- 6 45 +/- 7 44 +/- 7 11/21/12 - 11/29/12 36 +/- 5 38 +/- 5 41 +/- 5 34 +/- 5 31 +/- 5 36 +/- 5 38 +/- 5 29 +/- 5 36 +/- 5 11/29/12 - 12/06/12 30 +/- 5 32 +/- 5 32 +/- 5 31 +/- 5 30 +/- 5 37 +/- 5 28 +/- 5 30 +/- 5 32 +/- 5 12/06/12 - 12/13/12 25 +/- 5 25 +/- 5 22 +/- 5 25 +/- 5 24 +/- 5 27 +/- 5 23 +/- 5 24 +/- 5 28 +/- 5 12/13/12 - 12/20/12 34 +/- 6 33 +/- 6 37 +/- 6 35 +/- 6 31 +/- 5 36 +/- 6 40 +/- 6 34 +/- 6 34 +/- 6 12/20/12 - 12/27/12 23 +/- 5 22 +/- 5 26 +/- 5 20 +/- 5 26 +/- 5 28 +/- 5 24 +/- 5 22 +/- 5 24 +/- 5 12/27/12 - 01/03/13 43 +/- 6 44 +/- 6 47 +/- 6 43 +/- 6 43 +/- 6 44 +/- 6 47 +/- 6 40 +/- 6 49 +/- 6 MEAN 20 +/- 14 20 +/- 14 22 +/- 15 21 +/- 14 20 +/- 14 21 +/- 16 22 +/- 15 20 +/- 14 21 +/- 16

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-7 48 of 176

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, 2012 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 12/29/11 - 02/02/12 16 27 21 +/- 8 12/29/11 02/02/12 18 28 22 +/- 7 12/29/11 - 02/02/12 14 27 21 +/- 8 12/29/11 - 02/02/12 14 27 21 +/- 11 02/02/12 - 03/01/12 15 24 18 +/- 6 02/02/12 03/01/12 15 22 19 +/- 4 02/02/12 - 03/01/12 11 25 18 +/- 7 02/02/12 - 03/01/12 18 22 20 +/- 4 03/01/12 - 03/29/12 11 22 16 +/- 7 03/01/12 03/29/12 13 21 17 +/- 5 03/01/12 - 03/29/12 12 20 16 +/- 5 03/01/12 - 03/29/12 13 22 16 +/- 8 03/29/12 - 05/03/12 10 20 15 +/- 7 03/29/12 05/03/12 12 19 16 +/- 5 03/29/12 - 05/03/12 10 20 15 +/- 6 03/29/12 - 05/03/12 13 22 17 +/- 8 05/03/12 - 05/31/12 6 19 14 +/- 8 05/03/12 05/31/12 12 25 18 +/- 9 05/03/12 - 05/31/12 6 21 15 +/- 8 05/03/12 - 05/31/12 9 24 15 +/- 13 05/31/12 - 06/28/12 11 15 14 +/- 3 05/31/12 06/28/12 8 19 15 +/- 7 05/31/12 - 06/28/12 8 18 16 +/- 5 05/31/12 - 06/28/12 12 17 15 +/- 5 06/28/12 - 08/02/12 14 28 20 +/- 10 06/28/12 08/02/12 10 31 21 +/- 11 06/28/12 - 08/02/12 17 35 22 +/- 9 06/28/12 - 08/02/12 18 27 21 +/- 7 08/02/12 - 08/30/12 16 27 21 +/- 9 08/02/12 08/30/12 15 31 23 +/- 11 08/02/12 - 08/30/12 17 35 24 +/- 11 08/02/12 - 08/30/12 22 31 26 +/- 8 08/30/12 - 09/27/12 18 25 21 +/- 4 08/30/12 09/27/12 19 25 22 +/- 4 08/30/12 - 09/27/12 17 28 22 +/- 6 08/30/12 - 09/27/12 20 25 22 +/- 4 09/27/12 - 11/01/12 14 25 20 +/- 7 09/27/12 11/01/12 13 29 21 +/- 10 09/27/12 - 11/01/12 13 32 19 +/- 11 09/27/12 - 11/01/12 13 27 20 +/- 13 11/01/12 - 11/29/12 15 40 28 +/- 20 11/01/12 11/29/12 14 48 31 +/- 26 11/01/12 - 11/29/12 14 46 29 +/- 22 11/01/12 - 11/29/12 18 44 30 +/- 24 11/29/12 - 01/03/13 22 44 31 +/- 16 11/29/12 01/03/13 20 47 32 +/- 17 11/29/12 - 01/03/13 22 47 32 +/- 15 11/29/12 - 01/03/13 24 49 33 +/- 19 12/29/11 - 01/03/13 6 44 20 +/- 14 12/29/11 - 01/03/13 8 48 21 +/- 15 12/29/11 - 01/03/13 6 47 21 +/- 15 12/29/11 - 01/03/13 9 49 21 +/- 16

THE MEAN AND TWO STANDARD DEVIATION 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, 2012 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA SITE 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 12/29/11 - 03/29/12 <2 <6 < 20 <3 <7 <6 < 11 <4 <3 < 848 < 242 03/29/12 - 06/28/12 <2 <4 < 14 <3 <7 <5 <7 <2 <2 < 435 < 190 06/28/12 - 09/27/12 <4 <5 < 21 <4 < 11 < 10 < 11 <3 <3 < 1629 < 780 09/27/12 - 01/03/13 <2 <4 < 14 <2 <4 <4 <7 <2 <2 < 364 < 117 MEAN L-03 12/29/11 - 03/29/12 <3 <6 < 11 <3 <7 <6 <8 <2 <2 < 444 < 215 03/29/12 - 06/28/12 <3 <3 < 13 <2 <6 <5 <9 <2 <2 < 461 < 168 06/28/12 - 09/27/12 <4 <6 < 15 <4 < 11 < 11 < 12 <4 <4 < 2153 < 766 09/27/12 - 01/03/13 <2 <4 < 14 <3 <4 <4 <9 <3 <3 < 430 < 117 MEAN L-04 12/29/11 - 03/29/12 <2 <5 < 12 <3 <7 <5 <8 <2 <2 < 505 < 98 03/29/12 - 06/28/12 <3 <4 < 15 <3 <7 <5 < 10 <3 <2 < 485 < 174 06/28/12 - 09/27/12 <3 <7 < 24 <3 <6 <5 < 10 <3 <2 < 1248 < 475 09/27/12 - 01/03/13 <3 <4 < 10 <3 <7 <4 <8 <1 <3 < 331 < 176 MEAN L-05 12/29/11 - 03/29/12 <3 <7 < 18 <2 <8 <6 < 10 <3 <3 < 551 < 229 03/29/12 - 06/28/12 <3 <5 < 17 <3 <7 <5 <9 <3 <2 < 382 < 84 06/28/12 - 09/27/12 <4 <5 < 20 <4 < 13 <8 < 13 <4 <3 < 1975 < 830 09/27/12 - 01/03/13 <3 <4 < 11 <2 <6 <4 <9 <2 <2 < 417 < 166 MEAN L-06 12/29/11 - 03/29/12 <4 <6 < 16 <3 < 10 <7 < 13 <4 <3 < 819 < 246 03/29/12 - 06/28/12 <3 <6 < 15 <2 <6 <4 <8 <2 <3 < 276 < 180 06/28/12 - 09/27/12 <3 <8 < 25 <4 <8 < 10 < 14 <4 <3 < 2170 < 639 09/27/12 - 01/03/13 <3 <6 < 13 <3 <6 <5 <9 <2 <3 < 523 < 167 O MEAN - - - - - - - - - - -

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA SITE 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-07 12/29/11 - 03/29/12 <2 <4 < 12 <2 <6 <3 <9 <2 <2 < 336 < 178 03/29/12 - 06/28/12 <3 <4 < 12 <3 <7 <5 < 12 <2 <3 < 491 < 178 06/28/12 - 09/27/12 <3 <6 < 22 <3 <6 <5 <9 <3 <2 < 1509 < 831 09/27/12 - 01/03/13 <2 <5 < 12 <3 <6 <5 <9 <3 <2 < 460 < 185 MEAN L-08 12/29/11 - 03/29/12 <1 <3 <9 <2 <5 <4 <6 <2 <2 < 567 < 90 03/29/12 - 06/28/12 <2 <5 < 15 <3 <6 <7 < 10 <2 <2 < 362 < 105 06/28/12 - 09/27/12 <3 <5 < 22 <2 <6 <6 < 12 <3 <2 < 1510 < 386 09/27/12 - 01/03/13 <2 <3 < 12 <2 <5 <4 <7 <2 <2 < 370 < 205 MEAN L-10 12/29/11 - 03/29/12 <4 <6 < 15 <4 <9 <7 < 11 <4 <3 < 837 < 295 03/29/12 - 06/28/12 <2 <5 < 15 <2 <5 <6 <7 <2 <2 < 490 < 111 06/28/12 - 09/27/12 <2 <7 < 25 <4 < 11 <6 < 11 <3 <3 < 1695 < 800 09/27/12 - 01/03/13 <2 <3 < 14 <2 <7 <5 <8 <3 <2 < 368 < 84 MEAN L-11 12/29/11 - 03/29/12 <2 <5 < 22 <3 <5 <6 < 11 <3 <2 < 619 < 226 03/29/12 - 06/28/12 <3 <5 < 15 <3 <9 <5 < 10 <3 <3 < 487 < 166 06/28/12 - 09/27/12 <4 <5 < 18 <3 <9 <7 < 11 <3 <2 < 1874 < 605 09/27/12 -01/03/13 <2 <3 < 11 <2 <4 <4 <7 <2 <2 < 354 < 166 MEAN

TABLE C-VI.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I I GROUP II 1 GROUP III GROUP IV PERIOD L-03 L-05 L-01 L-06 L-04 L-07 L-08 L-11 L-10 12/29/11 01/05112 01/05/12 - 01/12/12 < 58 < 58 < 31 < 58 < 58 < 55 < 54 < 54 < 54 01/12/12 - 01/19/12 < 63 < 63 < 62 < 59 < 63 < 64 < 64 < 59 < 34 01/19/12 - 01/26/12 < 40 < 40 < 17 < 40 < 40 < 33 < 33 < 33 < 33 01/26/12 - 02/02/12 <19 <19 <19 <20 <19 <20 <20 <8 <20 02/02/12 - 02/09/12 < 37 < 37 < 14 < 37 < 37 < 34 < 35 (1) < 35 < 35 02/09/12 - 02/16/12 < 60 < 60 < 23 < 60 < 60 < 67 < 67 < 67 < 67 02/16/12 - 02/23/12 <18 <18 <7 <18 <18 <34 <34 <34 <34 02/23/12 - 03/01/12 < 35 (1) < 34 < 33 < 34 < 15 < 27 < 27 < 27 (1) < 27 03/01/12 - 03/08/12 < 54 < 55 < 32 < 54 < 54 < 67 < 66 < 66 < 66 03/08/12 - 03/15/12 < 52 < 21 < 52 < 54 < 52 < 70 < 70 < 69 < 69 03/15/12 - 03/22/12 < 49 < 49 < 21 < 49 < 49 < 34 < 34 < 34 < 34 03/22/12 - 03/29/12 < 47 < 47 < 47 < 17 < 47 < 58 < 58 < 58 < 58 03/29/12 - 04/05/12 <62 <60 <62 <23 <62 <65 <65 <65 <65 04/05/12 - 04/12/12 < 50 < 50 < 50 < 30 < 50 < 31 (1) < 16 < 30 < 30 04/12/12 - 04/19/12 <32 <32 <13 <32 <32 <3 <31 <31 <31 04/19/12 - 04/26/12 <30 <30 <30 <40 <30 <40 <40 <40 <22 04/26/12 - 05/03/12 < 45 < 45 < 45 < 27 < 45 < 60 < 60 < 59 < 60 05/03/12 - 05/10/12 < 27 < 63 (1) < 26 < 68 (1) < 55 (1) < 33 < 65 (1) < 14 < 32 05/10/12 - 05/17/12 <22 <33 (1) <10 <21 <21 <18 <18 <18 <18 05/17/12 - 05/24/12 < 64 < 69 < 28 < 64 < 63 < 65 < 64 < 64 < 64 05/24/12 - 05/31/12 <60 <59 (1) <59 <49 <59 <49 <49 <19 <49 05/31/12 - 06/07/12 < 23 < 61 < 58 < 60 < 60 < 68 < 68 < 67 < 68 06/07/12 - 06/14/12 <61 <61 <25 <63 <60 <66 <65 <65 <65 06/14/12 - 06/21/12 <32 <32 <31 <32 <12 <52 <51 <51 <51 06/21/12 - 06/28/12 <61 < 62 (1) < 30 < 59 < 59 < 55 < 54 < 54 < 54 06/28/12 - 07/05/12 <61 < 28 < 65 (1) < 62 < 62 < 53 < 53 < 53 < 53 07/05/12 - 07/12/12 <69 <69 <28 <68 <68 <61 <59 <60 <60 07/12/12 - 07/19/12 < 60 < 27 < 58 < 26 < 59 < 62 < 62 < 62 < 62 07/19/12 - 07/26/12 <40 <40 <15 <40 <40 <51 <51 <50 <50 07/26/12 - 08/02/12 < 57 < 57 < 57 < 24 < 57 < 53 < 53 < 53 < 53 08/02/12 - 08/09/12 < 43 < 44 < 18 < 43 < 43 < 50 < 49 < 49 < 49 08/09/12 - 08/16/12 < 25 < 25 < 25 < 39 < 25 < 17 < 39 < 39 < 39 08/16/12 - 08/23/12 < 43 < 43 < 18 < 43 < 43 < 33 < 33 < 32 < 32 08/23/12 - 08/30/12 <58 <58 <57 <61 <57 <62 <26 <61 <61 08/30/12 - 09/06/12 < 69 < 69 < 26 < 69 < 68 < 53 < 52 < 52 < 52 09/06/12 - 09/13/12 <58 <58 <58 <50 <58 <50 <50 <50 <21 09/13/12 - 09/20/12 < 32 < 32 < 17 < 32 < 32 < 46 < 49 < 49 < 49 09/20/12 - 09/27/12 <46 <47 <47 <66 <46 <69 <68 <26 <68 09/27/12 - 10/04/12 <53 <51 <28 <52 <53 <49 <48 <47 <47 10/04/12 - 10/11/12 <55 <55 <30 <55 <54 <56 <56 <55 <55 10/11/12 - 10/18/12 < 34 < 34 < 34 < 13 < 34 < 33 < 33 < 33 < 33 10/18/12 - 10/25/12 < 29 < 56 < 56 < 56 < 56 < 40 < 40 < 40 < 40 10/25/12 - 11/01/12 < 46 < 46 < 18 < 46 < 46 < 70 < 69 < 69 < 69 11/01/12 - 11/08/12 < 62 < 62 < 62 < 62 < 24 < 54 < 53 < 53 < 53 11/08/12 - 11/15/12 < 64 < 64 < 25 < 63 < 63 < 63 < 63 < 63 < 63 11/15/12 - 11/21/12 < 68 < 27 < 68 < 68 < 68 < 49 < 48 < 48 < 48 11/21/12 - 11/29/12 < 50 < 50 < 50 < 38 < 50 < 37 < 38 < 38 < 38 11/29/12 - 12/06/12 <49 <49 <49 <19 <49 <31 <31 <31 <31 12/06/12 - 12/13/12 <44 <44 <24 <44 <44 <45 <45 <45 <45 12/13/12 - 12/20/12 <46 <46 <46 <41 <46 <17 <40 <40 <40 12/20/12 - 12/27/12 <49 <50 <21 <50 <50 <44 <44 <44 <44 12/27/12 - 01/03/13 <67 <67 <68 <56 <66 <52 <24 <51 <51 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION c-11 52 of 176

TABLE C -VII.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM COLLECTION L-42 PERIOD 01/05/12 < 0.6 02/02/12 < 0.6 03/01/12 < 0.5 04/05/12 < 0.4 05/03/12 < 0.5 05/17/12 < 0.5 05/31/12 < 0.5 06/14/12 < 0.8 06/26/12 < 0.5 07/12/12 < 0.7 07/26/12 < 0.8 08/09/12 < 0.7 08/23/12 < 0.7 09/06/12 < 0.8 09/20/12 < 0.6 10/04/12 < 0.8 10/18/12 < 0.7 11/01/12 < 0.7 12/07/12 < 0.5 MEAN C-12 53 of 176

TABLE C-VIL2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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 01/05/12 <9 <9 <23 <12 <20 <11 <16 <9 <9 <43 <13 02/02/12 <6 <6 <14 <8 <12 <7 <9 <5 <6 <39 <11 03/01/12 <4 <4 <11 <5 <10 <4 <8 <4 <4 <24 <8 04/05/12 <7 <7 <18 <9 <16 <7 <14 <6 <7 < 44 < 13 05/03/12 <9 <7 <13 <5 <17 <9 <15 <7 <8 < 52 < 12 05/17/12 <5 <5 <13 <5 <12 <5 <9 <4 <5 <26 <9 05/31/12 <5 <5 <14 <7 <13 <5 <8 <4 <5 <31 <10 06/14/12 <5 <6 <12 <6 <12 <6 <8 <5 <5 <33 <9 06/26/12 <6 <7 <17 <8 <15 <7 <12 <6 <6 <31 <10 07/12/12 <5 <6 <14 <7 <12 <6 <8 <5 <6 <38 <12 07/26/12 <6 <6 <15 <8 <14 <7 <12 <5 <6 <50 <13 n 08/09/12 <4 <5 <10 <5 <10 <4 <8 <4 <5 <19 <7 08/23/12 <5 <5 < 14 <7 < 12 <7 < 11 <4 <6 <38 <12 09/06/12 <5 <5 <12 <6 <11 <5 <9 <5 <5 <30 <10 09/20/12 <8 <8 <17 <8 <15 <8 <14 <6 <8 < 42 < 13 10/04/12 <6 <6 <13 <6 <13 <6 <11 <6 <6 <36 <11 10/18/12 <6 <5 <13 <7 <13 <6 <10 <5 <6 <37 <11 11/01/12 <6 <6 <14 <7 <12 <5 <10 <5 <6 <41 <12 12/07/12 <5 <4 <13 <6 <10 <5 <10 <4 <5 <29 <8 MEAN

TABLE C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA SITE 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 Beet greens 09/15/12 < 16 < 14 < 44 < 22 < 34 < 14 < 29 < 39 < 14 < 17 < 94 < 21 Beets 09/15/12 < 10 < 11 < 26 < 15 < 27 < 12 < 20 < 23 < 10 < 11 < 59 < 13 MEAN L-QUAD 1 Cabbage 09/15/12 < 11 < 12 < 30 < 16 < 28 < 12 < 21 < 28 < 10 < 13 < 68 < 20 Radishes 09/20/12 < 14 < 16 < 40 < 19 < 33 < 17 < 32 < 50 < 13 < 15 < 101 < 26 MEAN L-QUAD 2 Broccoli 09/15/12 < 20 < 20 < 44 < 22 < 44 < 19 < 34 < 45 < 18 < 18 < 111 < 28 Sweet potatoes 09/22/12 < 18 < 18 < 46 < 22 < 40 < 21 < 32 < 58 < 17 < 17 < 116 < 32 MEAN L-QUAD 3 Cauliflower 09/15/12 <8 < 10 < 29 < 13 < 24 < 11 < 17 < 21 <9 < 10 < 56 < 15 Beets 09/22/12 < 16 < 16 < 35 < 19 < 34 < 17 < 27 < 40 < 13 < 14 < 104 < 30 MEAN L-QUAD 4 Cabbage 09/15/12 < 12 < 12 < 29 < 15 < 25 < 14 < 23 < 27 < 11 < 13 < 64 < 16 Beets 09/20/12 < 16 < 16 < 40 < 22 < 39 < 17 < 25 < 45 < 13 < 13 < 91 < 26 MEAN

TABLE C -IX.1 QUARTERLY OSLD RESULTS FOR LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/- 2 S.D. L-01-1 24.1 +/- 9.0 17.8 26.4 28.0 24.0 L-01-2 23.4 +/- 9.6 16.2 25.7 26.4 25.2 L-03-1 21.8 +/- 7.7 16.2 23.4 25.0 22.7 L-03-2 22.7 +/- 8.2 17.0 24.7 26.4 22.5 L-04-1 21.4 +/- 8.0 15.5 24.2 23.4 22.4 L-04-2 22.2 +/- 10.1 14.7 24.2 25.8 24.0 L-05-1 20.5 +/- 11.6 13.9 (1) 24.5 23.2 L-05-2 23.3 +/- 8.5 17.0 24.9 26.5 24.6 L-06-1 22.4 +/- 8.6 16.2 23.6 26.1 23.7 L-06-2 22.1 +/- 9.1 15.5 24.1 25.7 23.1 L-07-1 22.7 +/- 9.2 16.2 26.1 25.8 22.6 L-07-2 22.9 +/- 9.0 16.2 25.2 25.6 24.6 L-08-1 22.2 +/- 8.3 16.2 24.1 25.6 22.9 L-08-2 23.1 +/- 8.2 17.0 25.3 25.6 24.4 L-10-1 20.4 +/- 7.7 14.7 21.9 22.9 22.2 L-10-2 20.4 +/- 8.9 13.9 24.0 22.4 21.2 L-11-1 20.0 +/- 9.6 13.1 22.7 23.8 20.5 L-11-2 20.8 +/- 8.5 14.7 24.1 23.3 21.1 L-101-1 23.8 +/- 8.5 17.8 27.1 26.6 23.7 L-101-2 21.6 +/- 10.4 13.9 24.8 24.3 23.5 L-102-1 24.2 +/- 8.5 17.8 26.0 26.8 26.0 L-102-2 23.5 +/- 12.0 14.6 26.9 27.2 25.3 L-103-1 21.1 +/- 9.6 13.9 23.0 23.4 24.0 L-103-2 21.5 +/- 10.2 13.9 24.7 24.2 23.0 L-104-1 21.0 +/- 9.5 13.9 23.8 23.5 22.8 L-104-2 21.0 +/- 9.6 13.9 24.3 23.8 21.8 L-105-1 27.2 +/- 5.0 (1) 29.8 27.0 24.8 L-105-2 22.6 +/- 7.6 17.0 24.2 25.4 23.9 L-106-1 21.6 +/- 8.1 15.5 23.8 23.1 23.9 L-106-2 21.8 +/- 7.9 16.2 23.3 25.4 22.2 L-107-1 22.6 +/- 10.5 14.7 25.2 25.2 25.2 L-107-2 21.8 +/- 6.6 17.0 22.7 24.6 22.7 L-108-1 22.4 +/- 10.3 14.7 24.8 25.9 24.1 L-108-2 18.9 +/- 9.1 12.3 22.4 21.0 20.0 L-109-1 22.5 +/- 7.7 17.0 24.8 25.4 22.9 L-109-2 23.3 +/- 6.8 18.5 26.2 25.0 23.3 L-110-1 21.4 +/- 9.0 14.6 23.8 23.9 23.1 L-110-2 22.5 +/- 8.0 17.0 25.3 25.6 22.0 L-112-1 23.8 +/- 1.6 (1) 24.6 23.9 23.0 L-112-2 22.7 +/- 8.8 17.8 (1) 26.3 23.9 L-114-1 23.3 +/- 7.6 17.8 24.7 26.5 24.1 L-114-2 22.9 +/- 11.3 14.7 25.6 27.4 24.0 L-115-1 20.5 +/- 10.0 13.1 21.9 24.0 22.9 L-115-2 22.3 +/- 1.7 (1) 21.9 23.3 21.8 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

TABLE C -IX.1 QUARTERLY OSLD RESULTS FOR LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/- 2 S.D. L-116-1 18.9 +/- 8.7 13.9 22.0 (2) 20.8 L-116-2 20.7 +/- 9.2 13.9 22.3 24.3 22.1 L-201-3 19.6 +/- 7.7 13.9 21.6 22.4 20.3 L-201-4 22.7 +/- 10.8 14.7 25.5 26.4 24.2 L-202-3 21.8 +/- 7.6 16.2 23.8 24.5 22.6 L-202-4 19.7 +/- 9.7 12.4 21.7 22.5 22.1 L-203-1 22.5 +/- 11.3 14.2 25.1 26.8 23.8 L-203-2 22.0 +/- 7.8 16.2 23.2 24.8 23.6 L-204-1 22.0 +/- 9.8 14.7 24.1 25.4 23.6 L-204-2 23.6 +/- 8.5 17.8 23.4 27.9 (1) L-205-1 21.6 +/- 5.3 17.8 22.5 24.0 22.0 L-205-2 22.3 +/- 8.4 16.2 24.1 25.7 23.1 L-205-3 22.1 +/- 10.1 14.7 23.1 25.7 24.9 L-205-4 20.9 +/- 9.7 13.9 21.4 24.8 23.4 L-206-1 21.4 +/- 9.2 14.7 23.6 24.9 22.5 L-206-2 22.7 +/- 8.0 17.0 25.8 25.2 22.7 L-207-1 22.4 +/- 7.3 17.0 23.8 25.3 23.3 L-207-2 23.4 +/- 2.4 (1) 24.8 22.6 22.9 L-208-1 21.8 +/- 7.8 16.2 23.9 24.9 22.3 L-208-2 24.6 +/- 10.3 17.0 28.6 26.7 26.0 L-209-1 23.4 +/- 9.7 16.2 26.3 26.2 25.0 L-209-2 22.9 +/- 10.9 14.7 25.4 26.4 24.9 L-210-1 23.0 +/- 7.3 17.8 24.2 26.3 23.5 L-210-2 23.5 +/- 8.7 17.0 26.3 25.5 25.0 L-211-1 23.2 +/- 8.7 17.0 25.1 27.0 23.6 L-211-2 23.2 +/- 9.3 17.0 25.5 27.7 22.5 L-212-1 22.5 +/- 10.7 14.7 24.9 26.8 23.6 L-212-2 23.5 +/- 10.4 16.2 27.8 26.6 23.5 L-213-3 22.3 +/- 9.5 15.5 26.0 25.2 22.5 L-213-4 21.5 +/- 7.3 16.2 24.3 23.6 21.8 L-214-3 21.3 +/- 10.2 13.9 23.7 25.3 22.4 L-214-4 21.0 +/- 8.6 14.7 24.5 22.6 22.2 L-215-3 22.5 +/- 10.9 14.7 27.3 24.6 23.5 L-215-4 23.5 +/- 10.3 16.2 26.5 27.7 23.7 L-216-3 25.2 +/- 3.8 (1) 23.0 26.5 26.1 L-111 B-1 23.1 +/- 8.4 17.0 26.6 24.1 24.6 L-111 B-2 22.6 +/- 9.6 15.5 26.2 24.6 24.1 L-113A-1 23.7 +/- 9.2 17.0 27.2 26.2 24.5 L-113A-2 22.6 +/- 7.8 17.0 24.4 25.8 23.1 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-16 57 of 176

TABLE C -IX.2 MEAN QUARTERLY OSLD RESULTS FOR THE INNER RING, OUTER RING, OTHER AND CONTROL LOCATIONS FOR LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER +/- 2 STANDARD DEVIATIONS COLLECTION INNER RING OUTER RING OTHER CONTROL PERIOD +/- 2 S.D. JAN-MAR 15.6 +/- 3.5 15.7 +/- 2.7 15.8 +/- 2.5 14.3 +/- 1.1 APR-JUN 24.7 +/- 3.6 24.6 +/- 3.4 24.6 +/- 2.1 23.0 +/- 3.0 JUL-SEP 25.0 +/- 2.9 25.4 +/- 3.0 25.5 +/- 2.5 22.7 +/- 0.7 OCT-DEC 23.3 +/- 2.6 23.4 +/- 2.5 23.2 +/- 2.6 21.7 +/- 1.4 TABLE C -IX.2 MEAN QUARTERLY OSLD RESULTS FOR THE INNER RING,OUTER RING, OTHER AND CONTROL LOCATIONS FOR LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER +/- 2 STANDARD DEVIATIONS LOCATION SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/- 2 S.D. INNER RING 123 12.3 29.8 22.3 +/- 8.2 OUTER RING 130 12.4 28.6 22.4 +/- 8.2 OTHER 63 13.1 28.0 22.2 +/- 8.1 CONTROL 8 13.9 24 .0 20.4 +/- 7.7 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-1 16-2 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 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-17 58 of 176

FIGURE C-1 Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2012 L-21 (C) Illinois River at Seneca J_ U 4.0 2.0 0.0 1 I I I I 01-27-05 08-29-06 03-30-08 10-30-09 06-01-11 12-31-12 L-40 Illinois River Downstream J U Q C-18 59 of 176

FIGURE C-2 Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2012 L-21 Illinois River at Seneca 2000 1600 1200 800 400 0 03-31-05 10-18-06 05-06-08 11-23-09 06-12-11 12-29-12 L-40 Illinois River Downstream 2000 1600 1200 800 400 0 03-31-05 10-18-06 05-06-08 11-23-09 06-12-11 12-29-12 C-19 60 of 176

FIGURE C-3 Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2005 - 2012 L-01 Nearsite No. I 50.0 40.0 30.0 0 G Cl) 9 20.0 W 0.0 i 1 I 1 I 01-06-05 08-12-06 03-17-08 10-21-09 05-27-11 12-30-12 L-03 Onsite No. 3 0.0 i I I I I 01-06-05 08-12-06 03-17-08 10-21-09 05-27-11 12-30-12

FIGURE C-4 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2005 - 2012 L-05 Onsite No. 5 50.0 -r 40.0 + I 10.0 + 0.0 0 01-06-05 08-12-06 03-17-08 10-21-09 05-27-11 12-30-12 L-06 Nearsite No. 6 0.0 + + + + 01-06-05 08-12-06 03-17-08 10-21-09 05-27-11 12-30-12

FIGURE C-5 Air Particulate - Gross Beta - Station L-10 (C) Collected in the Vicinity of LSCS, 2005 - 2012 L-1 0 (C) Streator 60.0 -r 50.0 -{- E 40.0 U a 30.0 Cl) O W O 01-06-05 08-12-06 03-17-08 10-21-09 05-27-11 12-30-12 C-22 63 of 176

FIGURE C-6 Air Particulate - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LSCS, 2005 - 2012 L-04 Rte. 170 0.0 f I I 07-07-05 01-05-07 07-05-08 01-03-10 07-04-11 01-01-13 L-07 Seneca 50.0 40.0 M 30.0 U Q 9 20.0 W 10.0 0.0 i I I i I i 07-07-05 01-05-07 07-05-08 01-03-10 07-04-11 01-01-13 C-23 64 of 176

FIGURE C-7 Air Particulate - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LSCS, 2005 - 2012 L-08 Marseilles 50.0 T 40.0 Cl) C) 30.0 I

c. i 9 20.0 w

0 Yr 10.0 Y 0.0 i I- I I I 07-07-05 01-05-07 07-05-08 01-03-10 07-04-11 01-01-13 L-11 Ransom 60.0 T 50.0 + I I I 07-07-05 01-05-07 07-05-08 01-03-10 07-04-11 01-01-13 C-24 65 of 176

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

TABLE D -1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 1 OF 3) Identification Reported Known Ratio (c) Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d) March 2012 E10066 Milk Sr-89 pCi/L 101 94.8 1.07 A Sr-90 pCi/L 11.7 13.5 0.87 A E10067 Milk 1-131 pCi/L 87.5 92.5 0.95 A Ce-141 pCi/L 247 260 0.95 A Cr-51 pCi/L 435 436 1.00 A Cs-134 pCi/L 133 149 0.89 A Cs-137 pCi/L 156 159 0.98 A Co-58 pCi/L 127 132 0.96 A Mn-54 pCi/L 190 195 0.97 A Fe-59 pCi/L 179 168 1.07 A Zn-65 pCi/L 327 333 0.98 A Co-60 pCi/L 274 279 0.98 A E10069 AP Ce-141 pCi 167 164 1.02 A Cr-51 pCi 310 276 1.12 A Cs-134 pCi 107 94.5 1.13 A Cs-137 pCi 109 101 1.08 A Co-58 pCi 87.6 83.5 1.05 A Mn-54 pCi 133 123 1.08 A Fe-59 pCi 113 106 1.07 A Zn-65 pCi 226 210 1.08 A Co-60 pCi 185 176 1.05 A El 0068 Charcoal 1-131 pCi 92.8 94.2 0.99 A E10070 Water Fe-55 pCi/L 1800 1570 1.15 A June 2012 E10198 Milk Sr-89 pCi/L 86.1 99.8 0.86 A Sr-90 pCi/L 9.2 12.7 0.72 W E10199 Milk 1-131 pCi/L 88.9 99.7 0.89 A Ce-141 pCi/L 72.8 82.2 0.89 A Cr-51 pCi/L 394 402 0.98 A Cs-134 pCi/L 159 174 0.91 A Cs-137 pCi/L 206 212 0.97 A Co-58 pCi/L 89.5 92.3 0.97 A Mn-54 pCi/L 129 132 0.98 A Fe-59 pCi/L 129 128 1.01 A Zn-65 pCi/L 193 199 0.97 A Co-60 pCi/L 342 355 0.96 A E10201 AP Ce-141 pCi 73.2 75.1 0.97 A Cr-51 pCi 367 366 1.00 A Cs-134 pCi 165 159 1.04 A Cs-137 pCi 205 193 1.06 A Co-58 pCi 84.7 84.2 1.01 A Mn-54 pCi 118 121 0.98 A Fe-59 pCi 125 117 1.07 A Zn-65 pCi 181 182 0.99 A Co-60 pCi 338 324 1.04 A E10200 Charcoal 1-131 pCi 101 96.6 1.05 A 67 of 176 D-1

TABLE D -1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 2 OF 3) Identification Reported Known Ratio (c) Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d) June 2012 E10202 Water Fe-55 pCi/L 1890 1580 1.20 A September 2012 E10296 Milk Sr-89 pCi/L 106 99.6 1.06 A Sr-90 pCi/L 13.6 16.0 0.85 A E10297 Milk 1-131 pCi/L 89.8 99.6 0.90 A Ce-141 pCi/L 160 164 0.98 A Cr-51 pCi/L 230 248 0.93 A Cs-134 pCi/L 101 108 0.94 A Cs-137 pCi/L 174 174 1.00 A Co-58 pCi/L 97.2 100 0.97 A Mn-54 pCi/L 188 196 0.96 A Fe-59 pCi/L 159 152 1.05 A Zn-65 pCi/L 195 192 1.02 A Co-60 pCi/L 155 152 1.02 A E10299 AP Ce-141 pCi 145 135 1.07 A Cr-51 pCi 219 205 1.07 A Cs-134 pCi 94.1 89.4 1.05 A Cs-137 pCi 140 144 0.97 A Co-58 pCi 88.3 83.0 1.06 A Mn-54 pCi 173 162 1.07 A Fe-59 pCi 136 125 1.09 A Zn-65 pCi 165 159 1.04 A Co-60 pCi 133 125 1.06 A E10298 Charcoal 1-131 pCi 95.5 97.2 0.98 A E10300 Water Fe-55 pCi/L 1630 1900 0.86 A December 2012 E10334 Milk Sr-89 pCi/L 101 96.6 1.05 A Sr-90 pCi/L 11.3 13.8 0.82 A E10335 Milk 1-131 pCi/L 93.1 90.0 1.03 A Ce-141 pCi/L 52.5 51.0 1.03 A Cr-51 pCi/L 373 348 1.07 A Cs-134 pCi/L 157 165 0.95 A Cs-137 pCi/L 113 117 0.97 A Co-58 pCi/L 94.1 98.5 0.96 A Mn-54 pCi/L 116 116 1.00 A Fe-59 pCi/L 124 116 1.07 A Zn-65 pCi/L 190 186 1.02 A Co-60 pCi/L 172 170 1.01 A E10337A AP Ce-141 pCi 51.8 49.6 1.04 A Cr-51 pCi 372 338 1.10 A Cs-134 pCi 165 161 1.02 A Cs-137 pCi 113 114 0.99 A Co-58 pCi 96.5 95.8 1.01 A Mn-54 pCi 118 112 1.05 A Fe-59 pCi 105 112 0.94 A Zn-65 pCi 166 181 0.92 A Co-60 pCi 179 165 1.08 A 68 of 176 D-2

TABLE D -1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 3 OF 3) Identification Reported Known Ratio (c) Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d) December 2012 E10336 Charcoal 1-131 pCi 73.1 72.7 1.01 A E10333 Water Fe-55 pCi/L 1550 1750 0.89 A (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 69 of 176

TABLE D -2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 1 OF 1) Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Limits Evaluation (c) May 2012 RAD-89 Water Sr-89 pCi/L 63.4 58.5 46.9-66.3 A Sr-90 pCi/L 33.5 37.4 27.4-43.1 A Ba-133 pCi/L 89.2 82.3 69.1-90.5 A Cs-134 pCi/L 66.5 74.2 60.6-81.6 A Cs-137 pCi/L 152 155 140 - 172 A Co-60 pCi/L 73.3 72.9 65.6-82.6 A Zn-65 pCi/L 109 105 94.5 - 125 A Gr-A pCi/L 82.4 62.9 33.0-78.0 N (1) Gr-B pCi/L 43.6 44.2 29.6-51.5 A 1-131 pCi/L 25.9 27.1 22.5-31.9 A H-3 pCi/L 15433 15800 13800 - 17400 A MRAD-16 Filter Gr-A pCi/filter 39.5 77.8 26.1 - 121 A November, 2012 RAD-91 Water Sr-89 pCi/L 46.5 39.1 29.7-46.1 N (2) Sr-90 pCi/L 16.6 20.1 14.4-23.8 A Ba-133 pCi/L 85.2 84.8 71.3-93.3 A Cs-134 pCi/L 76.9 76.6 62.6-84.3 A Cs-137 pCi/L 177 183 165 - 203 A Co-60 pCi/L 77.4 78.3 70.5-88.5 A Zn-65 pCi/L 209 204 184 - 240 A Gr-A pCi/L 50.6 58.6 30.6-72.9 A Gr-B pCi/L 59.3 39.2 26.0-46.7 N (2) 1-131 pCi/L 22.9 24.8 20.6-29.4 A H-3 pCi/L 5020 4890 4190 - 5380 A MRAD-17 Filter Gr-A pCi/filter 59.6 87.5 29.3 - 136 A (1) Detector G 1 is slightly biased high for Th-230 based measurements used only for ERA Gross Alpha samples. NCR 12-05 (2) The Sr-89 found to known ratio was 1. 19, which TBE considers acceptable. It appears the aliquot was entered incorrectly for the Gross Beta NCR 12-13 (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. 70 of 176 D-4

TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP) TELEDYNE BROWN ENGINEERING, 2012 (PAGE 1 OF 2) Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c) March 2012 12-MaW26 Water Cs-134 Bq/L -0.0045 (1) A Cs-137 Bq/L 37.5 39.9 27.9-51.9 A Co-57 Bq/L 30.8 32.9 23.0-42.8 A Co-60 Bq/L 22.4 23.72 16.60 - 30.84 A H-3 Bq/L 456 437 306 - 568 A Mn-54 Bq/L 31.0 31.8 22.3-41.3 A K-40 Bq/L 144 142 99 - 185 A Sr-90 Bq/L -0.0084 (1) A Zn-65 Bq/L -0.369 (1) A 12-GrW26 Water Gr-A Bq/L 2.06 2.14 0.64-3.64 A Gr-B Bq/L 7.48 6.36 3.18-9.54 A 12-MaS26 Soil Cs-134 Bq/kg 831 828 580 - 1076 A Cs-137 Bq/kg 0.145 (1) A Co-57 Bq/kg 1270 1179 825 - 1533 A Co-60 Bq/kg 7.61 1.56 (2) N (3) Mn-54 Bq/kg 634 558 391 - 725 A K-40 Bq/kg 1690 1491 1044 - 1938 A Sr-90 Bq/kg 328 392 274 - 540 A Zn-65 Bq/kg 753 642 449 - 835 A 12-RdF26 AP Cs-134 Bq/sample 2.31 2.38 1.67-3.09 A Cs-137 Bq/sample 2 .15 1.79 1.25-2.33 W Co-57 Bq/sample -0 .0701 (1) A Co-60 Bq/sample 2.62 2.182 1.527 - 2.837 W Mn-54 Bq/sample 4 .13 3.24 2.27-4.21 W Sr-90 Bq/sample 0 .0185 (1) A Zn-65 Bq/sample 4.19 2.99 2.09-3.89 N (3) 12-GrF26 AP Gr-A Bq/sample 0.365 1.2 0.4-2.0 A Gr-B Bq/sample 2 .31 2.4 1.2-3.6 A 12-RdV26 Vegetation Cs-134 Bq/sample 8 .72 8.43 5.90-10.96 A Cs-137 Bq/sample 0 .0424 (1) A Co-57 Bq/sample 15.5 12.0 8 .4-15.6 W Co-60 Bq/sample 6.80 6.05 4 .24 - 7.87 A Mn-54 Bq/sample 0 .0057 (1) A Sr-90 Bq/sample 2 .24 2.11 1.48-2.74 A Zn-65 Bq/sample 10.5 8.90 6 .23-11.57 A September 2012 12-MaW27 Water Cs-134 Bq/L 21.4 23.2 16.2-30.2 A Cs-137 Bq/L 17.0 16.7 11.7-21.7 A Co-57 Bq/L 28.7 29.3 20.5-38.1 A Co-60 Bq/L 0.179 (1) A H-3 Bq/L 387 334 234 - 434 A Mn-54 Bq/L 18.1 17.8 12.5-23.1 A K-40 Bq/L 139 134 94 - 174 A Sr-90 Bq/L 19.6 12.2 8.5-15.9 N (4) Zn-65 Bq/L 27.2 25.9 18.1-33.7 A 12-GrW27 Water Gr-A Bq/L 0.966 1.79 0,54-3.04 A Gr-B Bq/L 10.0 9.1 4.6-13.7 A D-5 71 of 176

TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP) TELEDYNE BROWN ENGINEERING, 2012 (PAGE 2 OF 2) Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c) September 2012 12-MaS27 Soil Cs-134 Bq/kg 880 939 657 - 1221 A Cs-137 Bq/kg 1220 1150 805 - 1495 A Co-57 Bq/kg 1330 1316 921 -1711 A Co-60 Bq/kg 552 531 372 - 690 A Mn-54 Bq/kg 1000 920 644 - 1196 A K-40 Bq/kg 674 632 442 - 822 A Sr-90 Bq/kg 528 508 356 - 660 A Zn-65 Bq/kg 665 606 424 - 788 A 12-RdF27 AP Cs-134 Bq/sample 2 .760 2.74 1,92-3.56 A Cs-137 Bq/sample 0 .0415 (1) A Co-57 Bq/sample 2 .00 191.00 1.34-2.48 A Co-60 Bq/sample 1 .78 1.728 1.210 - 2.246 A Mn-54 Bq/sample 2 .40 2.36 1.65-3.07 A Sr-90 Bq/sample 0 .931 1.03 0.72-1.34 A Zn-65 Bq/sample -0 .688 (1) A 12-GrF27 AP Gr-A Bq/sample 0 .434 0.97 0.29-1.65 A Gr-B Bq/sample 1 .927 1.92 0.96-2.88 A 12-RdV27 Vegetation Cs-134 Bq/sample 6 .28 6.51 4.56-8.46 A Cs-137 Bq/sample 4.62 4.38 3.07-5.69 A Co-57 Bq/sample 6.51 5.66 3 .96-7.36 A Co-60 Bq/sample 5 .32 5.12 3.58-6.66 A Mn-54 Bq/sample 3 .59 3.27 2.29-4.25 A Sr-90 Bq/sample 0 .0012 (1) A Zn-65 Bq/sample -0 .046 (1) A (1) False positive test. (2) Sensitivity evaluation (3) No cause was found for the failed high soil Co-60 sensitivity test or the high Zn-65 in AP, which TBE considers an anomaly. NCR 12-08 (4) Sr-90 in water high due to incorrect aliquot entered in AIMS. 12-11 (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. 72 of 176 D-6

TABLE D-4 ERA (a) STATISTICAL

SUMMARY

PROFICIENCY TESTING PROGRAMa ENVIRONMENTAL, INC., 2012 (Page 1 of 1) Concentration (pCi/L) Lab Code Date Analysis Laboratory ERA Control Result b Result ° Limits Acceptance ERW-1783 04/09/12 Sr-89 62.2 +/- 6.0 58.5 46.9-66.3 Pass ERW-1783 04/09/12 Sr-90 33.7 +/- 2.1 37.4 27.4 - 43.1 Pass ERW-1786 04/09/12 Ba-133 75.7 +/- 4.1 82.3 69.1 - 90.5 Pass ERW-1786 04/09/12 Co-60 71.9 +/- 4.0 72.9 65.6 -82.6 Pass ERW-1786 04/09/12 Cs-134 70.0 +/- 4.3 74.2 60.6 -81.6 Pass ERW-1786 04/09/12 Cs-137 151.5 +/- 6.1 155.0 140.0 - 172.0 Pass ERW-1786 04/09/12 Zn-65 108.3 +/- 89.0 105.0 94.5 - 125.0 Pass ERW-1789 04/09/12 Gr. Alpha 55.0 +/- 2.4 62.9 33.0 - 78.0 Pass ERW-1789 ° 04/09/12 Gr. Beta 76.2 +/- 1.8 44.2 29.6-51.5 Fail ERW-1798 04/09/12 H-3 16023 +/- 355 15800 13800 - 17400 Pass ERW-6283 10/05/12 Sr-89 41.5 +/- 4.1 39.1 29.7-46.1 Pass ERW-6283 10/05/12 Sr-90 19.7 +/- 1.6 20.1 14.4 -23.8 Pass ERW-6286 10/05/12 Ba-133 82.7 +/- 4.4 84.8 71.3 -93.3 Pass ERW-6286 10/05/12 Co-60 77.2 +/- 3.7 78.3 70.5 - 88.5 Pass ERW-6286 10/05/12 Cs-134 74.4 +/- 1.5 76.6 62.6 -84.3 Pass ERW-6286 10/05/12 Cs-137 183.0 +/- 6.2 183.0 165.0 - 203.0 Pass ERW-6286 10/05/12 Zn-65 211.0 +/- 9.9 204.0 184.0 - 240.0 Pass ERW-6288 10/05/12 Gr. Alpha 47.0 +/- 2.3 58.6 30.6 - 72.9 Pass ERW-6288 10/05/12 Gr. Beta 33.4 +/- 1.2 39.2 26.0 -46.7 Pass ERW-6290 10/05/12 1-131 23.3 +/- 1.0 24.8 20.6 -29.4 Pass a Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing in drinking water conducted by Environmental Resources Associates (ERA). b Unless otherwise indicated, the laboratory result is given as the mean +/- standard deviation for three determinations. ° Results are presented as the known values, expected laboratory precision (1 sigma, 1 determination) and control limits as provided by ERA. d Result of reanalysis: 38.3 +/- 1.3 pCi/L. Sample dilution problem suspected. A new dilution was prepared. D-7 73 of 176

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP) ENVIRONMENTAL, INC., 2012 (Page 1 of 2) Concentration a Known Control Lab Code ° Date Analysis oratory result Activity Limits ° Acceptance STSO-1766 02/01/12 Co-57 1352.10 +/- 4.00 1179.00 825.00 - 1533.00 Pass STSO-1766 02/01/12 Co-60 1.70 +/- 0.70 1.56 1.00 - 2.00 Pass STSO-1766 02/01/12 Cs-134 842.20 +/- 4.30 828.00 580.00 - 1076.00 Pass STSO-1766 02/01/12 Cs-137 0.40 +/- 0.90 0.00 0.00 - 1.00 Pass STSO-1766 02/01/12 K-40 1729.60 +/- 22.20 1491.00 1044.00 - 1938.00 Pass STSO-1766 02/01/12 Mn-54 647.60 +/- 4.20 558.00 391.00 - 725.00 Pass STSO-1766 02/01/12 Sr-90 383.20 +/- 15.30 392.00 274.00 - 510.00 Pass STSO-1766 02/01/12 Zn-65 766.70 +/- 6.70 642.00 449.00 - 835.00 Pass STAP-1772 02/01/12 Co-57 0.010 +/- 0.01 0.00 0.000 -1.00 Pass STAP-1772 02/01/12 Co-60 2.40 +/- 0.08 2.18 1.53 -2.84 Pass STAP-1772 02/01 / 12 Cs-134 2.33 +/- 0.13 2.38 1.67 -3.09 Pass STAP-1772 02/01/12 Cs-137 2 .07 +/- 0.10 1.79 1.25 - 2.33 Pass STAP-1772 02/01/12 Mn-54 3.77 +/- 0. 14 3.24 2.27-4.21 Pass STAP-1772 02/01/12 Sr-90 -0.010 +/- 0.060 0.000 -0.10 -0.13 Pass STAP-1 772 02/01/12 Zn-65 3.67 +/- 0.20 2.99 2.09 - 3.89 Pass STAP-1773 02/01/12 Gr. Alpha 0.51 +/- 0.05 1.20 0.40 -2.00 Pass STAP-1773 02/01/12 Gr. Beta 2.75 +/- 0.10 2.40 1.20 -3.60 Pass STVE-1776 02/01/12 Co-57 14.57 +/- 0.28 12.00 8.40 - 15.60 Pass STVE-1776 02/01/12 Co-60 6.45 +/- 0.23 6.05 4.24-7. 87 Pass STVE-1776 02/01/12 Cs-134 8.39 +/- 0.29 8.43 5.90 - 10.96 Pass STVE-1776 02/01/12 Cs-137 0.01 +/- 0.09 0.00 0.00 -0.10 Pass STVE-1776 02/01/12 Mn-54 0.03 +/- 0.08 0.00 0.00 - 0.10 Pass STVE-1776 02/01/12 Zn-65 10.31 +/- 0.67 8.90 6.23 -11.57 Pass STW-1960 02/01/12 Gr. Alpha 1.68 +/- 0.09 2.14 0.64-3.64 Pass STW-1 960 02/01/12 Gr. Beta 6.33 +/- 0.10 6.36 3.18 - 9.54 Pass STW-1964 02/01/12 Co-57 33.30 +/- 0.40 32.90 23.00 - 42.80 Pass STW-1964 02/01/12 Co-60 23.20 +/- 0.40 23.72 16.60 - 30.84 Pass STW-1964 02/01/12 Cs-134 0.30 +/- 3.00 0.00 0.00-1.00 Pass STW-1964 02/01/12 Cs-137 40.10 +/- 0.60 39.90 27.90 - 51.90 Pass STW-1964 02/01/12 H-3 460.00 +/- 12.10 437.00 306.00 - 568.00 Pass STW-1964 02/01/12 K-40 153.00 +/- 4.20 142.00 99.00 - 185.00 Pass STW-1964 02/01/12 Mn-54 32.70 +/- 0.60 31.80 22.30 -41.30 Pass STW-1964 02/01/12 Sr-90 0.10 +/- 0.20 0.00 0.00 - 1.00 Pass STW-1964 02/01/12 Zn-65 0.01 +/- 0.20 0.00 0.00 - 1.00 Pass D-8 74 of 176

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP) ENVIRONMENTAL, INC., 2012 (Page 2 of 2) Concentration a Known Control Lab Code n Date Analysis oratory result Activity Limits ° Acceptance STSO-5392 08/01/12 Sr-90 483.52 +/- 16.47 508.00 356.00 - 660.00 Pass STSO-5394 08/01 /12 Co-57 1528.00 +/- 4.10 1316.00 921.00 -1711.00 Pass STSO-5394 08/01/12 Co-60 592.00 +/- 3.20 531.00 372.00 - 690.00 Pass STSO-5394 08/01 /12 Cs-134 933.60 +/- 5.82 939.00 657.00 - 1221.00 Pass STSO-5394 08/01 /12 Cs-137 1319.80 +/- 5.50 1150.00 805.00 - 1495.00 Pass STSO-5394 08/01 /12 K-40 737.30 +/- 17.70 632.00 442.00 - 822.00 Pass STSO-5394 08/01/12 Mn-54 1083.20 +/- 5.20 920.00 644.00 - 1196.00 Pass STSO-5394 08/01/12 Zn-65 696.10 +/- 7.00 606.00 424.00 - 788.00 Pass STVE-5395 ° 08/01 /12 Co-57 7.44 +/- 0.17 5.66 3.96 - 7.36 Fail STVE-5395 08/01 /12 Co-60 5.90 +/- 0.15 5.12 3.58-6.66 Pass STVE-5395 08/01 /12 Cs-134 7.40 +/- 0.31 6.51 4.56 - 8.46 Pass STVE-5395 08/01 /12 Cs-137 5.45 +/- 0.18 4.38 3.07 - 5.69 Pass STVE-5395 08/01/12 Mn-54 4.06 +/- 0.21 3.27 2.29 - 4.25 Pass STAP-5398 08/01/12 Gr. Alpha 0.41 +/- 0.05 0.97 0.29 - 1.65 Pass STAP-5398 08/01/12 Or. Beta 2.11 +/- 0.09 1.92 0.96 - 2.88 Pass 1.96 STAP-5403 +/- 08/01 /12 0.05 Co-57 1.91 1.34 -2.48 Pass STAP- 5403 08/01/12 Co-60 1.76 +/- 0.07 1.73 1.21 -2.25 Pass STAP- 5403 08/01/12 Cs-134 2.74 +/- 0.18 2.74 1.92 -3.56 Pass STAP-5403 08/01 /12 Cs-137 0.00 +/- 0.03 0.00 -0.01 - 0.01 Pass STAP- 5403 08/01/12 Mn-54 2.52 +/- 0.10 2.36 1.65 - 3.07 Pass STAP-5403 08/01/12 Zn-65 0.01 +/- 0.06 0.00 -0.010 - 0.010 Pass a Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation). b Laboratory codes as follows: STW (water), STAP (air filter), STSO (soil), STVE (vegetation). MAPEP results are presented as the known values and expected laboratory precision (1 sigma, 1 determination) and control limits as defined by the MAPEP. A known value of "zero" indicates an analysis was included in the testing series as a "false positive". MAPEP does not provide control limits. d Result of reanalysis; 6.74 +/- 0. 15 Bq/sample. Gamma emitters for the vegetation matrix exhibited a high bias, only Co-57 exceeded acceptance limits. Recounted using a geometry more closely matched to the MAPEP sample size. D-9 75 of 176

APPENDIX E EFFLUENT DATA

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 ............................................................................ 4 3.1.1.1. Gamma Dose Rates .................................................. 4 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 77 of 176

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 Summation of all Liquid 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-1.6 Table 3.3.1 10CFR20 Compliance Assessment .............................................. E-1.7 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data ............................................. E-1.8 ii 78 of 176

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 3546 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 79 of 176

SUMMARY

Gaseous effluents for the period contributed to only a small fraction of the LaSalle County Station Radiological Effluent Controls 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 1.09E+00 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." The results of analysis confirm that the station is operating in compliance with 10CFR50 Appendix I, 10CFR20 and 40CFR190. 2 80 of 176

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 3.68E+03 curies of fission and activation gases were released with an average release rate of 1.17E+02 pCi/sec. A total of 6.18E-02 curies of 1-131 were released during the year with an average release rate of 1.96E-03pCi/sec. A total of 1.09E-02 curies of beta-gamma emitters were released as airborne particulate matter with an average release rate of 3.46E-04 pCi/sec. Alpha-emitting radionuclides were below the lower limit of detection (LLD). Carbon-14 released in 2012 was calculated separately with a total of 3.41 E+01 curies released with an average release rate of 1.08E+00 pCi/sec. A total of 1.27E+01 curies of tritium were released with an average release rate of 4.02E-01 pCi/sec. 1.2 Liquids Released to Illinois River There were no liquid batch releases in 2012. Continuous release path activity was below applicable Lower Limits of Detection. 2.0 SOLID RADIOACTIVE WASTE Solid radioactive wastes were shipped by truck to a disposal facility or to a waste processor. For further detail, refer the LaSalle 2012 Radioactive Effluent Release Report. This report was submitted to the USNRC by the required date of May 1st, 2013. 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 81 of 176

3.1.1 Noble Gases 3.1.1.1 Gamma Dose Rates Unit 1 and Unit 2 gaseous releases at LaSalle 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 2.84E-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 1.86E-02 mrem (Table 3.4-1). The maximum gamma air dose was 4.26E-02 mrad from Table 3.1-1, and the maximum gamma air dose from concurrent meterorological data was 4.97E-03 mrad (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 4.78E-02 from Table 3.1-1, and the skin dose from concurrent meteorological data was 5.09E-03 mrem (Table 3.4-1). The maximum offsite beta dose for the 4 82 of 176

year was 1.98E-03 mrad from Table 3.1-1, and the maximum offsite beta dose from concurrent meteorological data was1.78E-03 mrad (Table 3.4-1). 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 is 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 3.05E-01 mrem for the year. 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 2012, LaSalle County Station did not exceed these limits as shown in Table 3.1-1 and 5 83 of 176

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 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 99.8% during 2012.

Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1) 6 84 of 176

APPENDIX E-1 DATA TABLES AND FIGURES E-1.1 85of176

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 2012 Effluent Report. E-1.2 86 of 176

Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2012) UNIT 1 AND UNIT 2 DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES Est. Total A. Fission & Activation Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Error %

1. Total Release Ci 6.91 E+02 8.30E+02 1.13E+03 1.03E+03 2.50E+01

2. Average release rate for the period µCi/sec 8.77E+01 1.05E+02 1.43E02 1.31 E+02

3. Percent of ODCM limit % * *

B. Iodine

1. Total Iodine - 131. Ci 9.77E-03 1.03E-02 1.69E-02 2.48E-02 1.50E+01

2. Average release rate for the period µCi/sec 1.24E-03 1.30E-03 2.14E-03 3.15E-03

3. Percent of ODCM limit %

C. Particulates

1. Particulates with half-lives > 8 days Ci 2.47E-03 1.32E-03 4.74E-03 2.37E-03 3.50E+01

2. Average release rate for the period µCi/sec 3.14E-04 1.68E-04 6.03E-04 3.02E-04

3. Percent of ODCM limit %

D. Tritium

1. Total Release Ci 1.03E+01 1.79E+00 4.66E-01 1,30E-01 1.50E+01

2. Average release rate for the period µCi/sec 1.30E+00 2.27E-01 5.91 E-02 1.65E-02

3. Percent of ODCM limit %

E. Gross Alpha

1. Total Release Ci <1.00E-11 <1.00E-11 <1.00E-11 <1.00E-11 3.50E+01

2. Average release rate for the period µCi/sec <LLD <LLD <LLD <LLD

3. Percent of ODCM limit %

F. Carbon-14

1. Total Release Ci 8.45E+00 8.52E+00 8.58E+00 8.57E+00

2. Average release rate for the period µCi/sec 1.07E+00 1.08E+00 1.09E+00 1.09E+00

3. Percent of ODCM 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 pCi/ml E-1.3 87 of 176

Tablel.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2012) LIQUID RELEASES UNIT I AND UNIT 2 SUMMATION OF ALL LIQUID RELEASES Est. Total A. Fission & Activation Products Unit Quarter I Quarter 2 Quarter 3 Quarter4 Error %

1. Total Release (not including tritium, gases <LLD <LLD <LLD <LLD N/A Ci

& alpha)

2. Average diluted concentration during <LLD

                                              µCi/mL        <LLD      <LLD        <LLD period

3. Percent of applicable limit % *

B. Tritium

1. Total Release Ci <LLD <LLD <LLD <LLD N/A

2. Average diluted concentration during <LLD <LLD

                                              µCi/m L       <LLD      <LLD period

3. Percent of applicable limit %

C. Dissolved & Entrained Gases

1. Total Release Ci <LLD <LLD <LLD <LLD N/A

2. Average diluted concentration during <LLD <LLD

                                              µCi/m L       <LLD                  <LLD period

3. Percent of applicable limit %

D. Gross Alpha Activity

1. Total Release Ci <LLD <LLD <LLD <LLD N/A

2. Average release rate for the period µCi/m L <LLD <LLD <LLD <LLD

3. Percent of ODCM limit %

E. Volume of Waste Released (prior to Liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 dilution) F. Volume of Dilution Water Used During 0.00E+00 Liters 0.00E+00 0.00E+00 0.00E+00 Period This information is contained in the Radiological Impact on Man section of the report. "<" Indicates activity of sample is less than LLD given in pCi/mi E-1.4 88 of 176

Table 3.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2012) RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM GASEOUS RELEASES AND COMPLIANCE STATUS Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Infant Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 6.42E-03 0.13 9.00E-03 0.18 1.39E-02 0.28 1.33E-02 0.27 1.00E+01 0.85 Beta Air 1.00E+01 mRad 3.64E-04 0.004 4.30E-04 0.00 6.09E-04 0.01 5.74E-04 0.01 2.00E+01 0.02 NG Total Body 2.50E+00 mRem 4.28E-03 0.17 6.00E-03 0.24 9.28E-03 0.37 8.87E-03 0.35 5.00E+00 1.14 NG Skin 7.50E+00 mRem 7.24E-03 0.10 1.01E-02 0.13 1.56E-02 0.21 1.49E-02 0.20 1.50E+01 0.64 NNG Organ 7.50E+00 mRem 4.84E-02 0.64 5.10E-02 0.68 8.35E-02 1.11 1.22E-01 1.63 1.50E+01 4.07 Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Child Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 6.42E-03 0.13 9.00E-03 0.18 1.39E-02 0.28 1.33E-02 0.27 1.00E+01 0.85 Beta Air 1.00E+01 mRad 3.64E-04 0.004 4.30E-04 0.00 6.09E-04 0.01 5.74E-04 0.01 2.00E+01 0.02 NG Total Body 2.50E+00 mRem 4.28E-03 0.17 6.00E-03 0.24 9.28E-03 0.37 8.87E-03 0.35 5.00E+00 1.14 NG Skin 7.50E+00 mRem 7.24E-03 0.10 1.01E-02 0.13 1.56E-02 0.21 1.49E-02 0.20 1.50E+01 0.64 NNG Organ 7.50E+00 mRem 2.01E-02 0.27 2.12E-02 0.28 3.46E-02 0.46 5.06E-02 0.67 1.50E+01 1.69 Teenager Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 6.42E-03 0.13 9.00E-03 0.18 1.39E-02 0.28 1.33E-02 0.27 1.00E+01 0.85 Beta Air 1.00E+01 mRad 3.64E-04 0.004 4.30E-04 0.00 6.09E-04 0.01 5.74E-04 0.01 2.00E+01 0.02 NG Total Body 2.50E+00 mRem 4.28E-03 0.17 6.00E-03 0.24 9.28E-03 0.37 8.87E-03 0.35 5.00E+00 1.14 NG Skin 7.50E+00 mRem 7.24E-03 0.10 1.01E-02 0.13 1.56E-02 0.21 1.49E-02 0.20 1.50E+01 0.64 NNG Organ 7.50E+00 mRem 1.01E-02 0.14 1.07E-02 0.14 1.74E-02 0.23 2.55E-02 0.34 1.50E+01 0.85 Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Adult Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 6.42E-03 0.13 9.00E-03 0.18 1.39E-02 0.28 1.33E-02 0.27 1.00E+01 0.85 Beta Air 1.00E+01 mRad 3.64E-04 0.004 4.30E-04 0.00 6.09E-04 0.01 5.74E-04 0.01 2.00E+01 0.02 NG Total Body 2.50E+00 mRem 4.28E-03 0.17 6.00E-03 0.24 9.28E-03 0.37 8.87E-03 0.35 5.00E+00 1.14 00 NG Skin 7.50E+00 mRem 7.24E-03 0.10 1.01E-02 0.13 1.56E-02 0.21 1.49E-02 0.20 1.50E+01 0.64 7.50E+00 mRem 6.41E-03 0.09 6.74E-03 0.09 1.10E-02 0.15 1.61E-02 0.21 1.50E+01 0.54 ° NNG Organ

Table 3.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2012) RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM LIQUID RELEASES AND COMPLIANCE STATUS Infant Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water) Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Child Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit IOCFR50 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 1.00E+01 0.00 7140CFR141 compliance (nearest public drinking water) Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Teenager Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water) Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Adult Quarterly 1st % of 2nd % of 3rd % of 4th % of Annual % of Units Limit Limit Limit Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter 10CFR50 Appendix I compliance e' a Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00

  °,      Organ           5.00E+00       mRem 0.00E+00             0.00    0.00E+00      0.00  0.00E+00 0.00  0.00E+00 0.00  1.00E+01 0.00
  -40CFR141 compliance (nearest public drinking water)

Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00

Table 3.3-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2012) RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS 1 OCFR20 / 40CFR190 Compliance 1st 2nd 3rd 4th % Quarter Quarter Quarter Quarter Annual Annual Annual Dose Dose Dose Dose Dose Limit Limit (mRem) (mRem) (mRem) (mRem) (mRem) (mRem/yr) Unit 1 40CFR190 Compliance U1 DEx 7.69E-02 1.03E-01 1.06E-01 1.08E-01 3.93E-01 25 1.57 10CFR20 Compliance U1 DTot 1.25E-01 1.54E-01 1.89E-01 2.30E-01 6.98E-01 100 0.70 40CFR190 Compliance Bone 7.04E -03 7.60E-03 7.28E-03 7.33E-03 2.93E-02 25 0.12 Liver 1.68E - 03 1.67E - 03 1.76E-03 1.89E-03 7.00E-03 25 0.03 Thyroid 4.84E-02 5.10E-02 8.35E-02 1.22E- 01 3.05E-01 75 0.41 Kidney 1.70E -03 1.69E- 03 1.80E-03 1.96E-03 7.15E-03 25 0.03 Lung 1.52E -03 1.51 E03 1.50E-03 1.52E-03 6.05E-03 25 0.02 GI-LLI 1.54E-03 1.52E- 03 1.52E-03 1.53E-03 6.11 E-03 25 0.02 Unit 2 40CFR190 Compliance U2 DEx 9.75E-02 9.65E-02 9.60E-02 9.79E-02 3.88E-01 25 1.55 10CFR20 Compliance U2 DTot 9.75E-02 9.65E-02 9.60E-02 9.79E-02 3.88E-01 100 0.39 40CFR190 Compliance Bone 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Liver 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Thyroid 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 75 0.00 Kidney 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 Lung 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 GI-LLI 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 0.00 E-1.7 91 of 176

Table 3.4-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2012) RADIOLOGICAL IMPACT ON MAN MAXIMUM GAMMA AIR DOSE The following are the maximum annual calculated cumulative offsite doses resulting from LaSalle County Station airborne releases. LaSalle County Generating Station: Sector Dose Alaxlinwn Value gamma air (;) 4.970 x 1W mrad No th-Northeast beta air 12) 1.780 x 10 mrad North-Northeast whole body ar 1.857 x 10-2 mrem North-Northeast skin (`) 5.090 x 10 mrem North-Northeast organ to (Infant-thyroid) 1.356 x 10'° mrern North-Northeast Compliance Status 10 CFR 60 Appendix 1 Yearly Objective % of Appendix 1 gamma air 10.0 mrad 0.05 beta air 20.0 mraad 0.01 whole body 5.0 mrem 0.37 skin 15.0 mreln 0.03 organ 15.0 mreni 9.04 Gamma Ak Dose - GASPAR 11, NUREG-0567 Beta Air Dose - GASPAR 11, N1REG-0597 Whole Body Dose - GASPAR H. NUREG.0597 Skit Dose - GASPAR It, NUREG-058? lnhalafbon and Food Pa ways Dose - GASPAR It. NURE0-4597 E-1.8 92 of 176

APPENDIX F METEOROLOGICAL DATA

LaSalle County Generating Station Period of Record: January - March 2012 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 1 9 2 0 0 0 12 NNE 0 2 2 0 0 0 4 NE 0 0 4 9 0 0 13 ENE 0 1 5 15 1 0 22 E 0 3 12 2 0 0 17 ESE 0 2 1 0 3 0 6 SE 0 1 1 3 4 0 9 SSE 0 0 0 0 1 0 1 S 0 0 1 5 1 0 7 SSW 0 1 2 2 1 0 6 SW 2 5 8 2 1 0 18 WSW 2 2 7 1 1 2 15 W 1 0 12 1 1 1 16 WNW 1 1 8 7 3 0 20 NW 0 1 3 2 2 2 10 NNW 0 2 1 2 5 0 10 Variable 0 0 0 0 0 0 0 Total 7 30 69 51 24 5 186 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 94 of 176 F-1

LaSalle County Generating Station Period of Record: January - March 2012 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 2 1 0 0 0 3 NNE 0 1 1 0 0 0 2 NE 1 0 1 2 0 0 4 ENE 0 0 1 2 0 0 3 E 0 4 0 0 0 0 4 ESE 0 4 0 0 0 0 4 SE 0 0 1 4 1 0 6 SSE 0 0 2 0 3 0 5 S 0 0 1 4 1 0 6 SSW 0 0 1 8 0 0 9 SW 0 0 0 1 4 0 5 WSW 0 0 4 1 0 0 5 W 0 0 5 1 0 1 7 WNW 0 1 3 5 2 0 11 NW 0 0 1 1 1 0 3 NNW 0 2 2 1 0 0 5 Variable 0 0 0 0 0 0 0 Total 1 14 24 30 12 1 82 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 95 of 176 F-2

LaSalle County Generating Station Period of Record: January - March 2012 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 1 4 9 0 0 0 14 NNE 0 2 0 1 0 0 3 NE 0 0 0 4 0 0 4 ENE 0 2 2 4 0 0 8 E 1 0 4 0 0 0 5 ESE 0 2 4 0 0 0 6 SE 0 2 3 2 0 0 7 SSE 0 0 1 6 3 0 10 S 0 1 11 4 0 2 18 SSW 0 0 4 5 2 1 12 SW 0 0 1 1 2 0 4 WSW 0 0 4 1 0 0 5 W 0 1 6 1 0 0 8 WNW 0 0 10 8 2 1 21 NW 0 3 6 3 0 0 12 NNW 0 2 4 2 0 0 8 Variable 0 0 0 0 0 0 0 Total 2 19 69 42 9 4 145 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 96 of 176 F-3

LaSalle County Generating Station Period of Record: January - March 2012 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 5 15 1 2 1 24 NNE 0 14 12 4 0 0 30 NE 0 8 13 7 3 0 31 ENE 0 4 16 26 1 0 47 E 0 7 11 8 0 0 26 ESE 0 6 9 6 0 0 21 SE 1 5 4 10 6 0 26 SSE 1 2 8 7 5 3 26 S 0 7 13 20 7 3 50 SSW 1 4 16 9 6 12 48 SW 0 8 14 14 14 4 54 WSW 0 9 24 18 5 2 58 W 0 11 22 50 5 2 90 WNW 1 6 25 37 18 10 97 NW 0 9 14 14 5 1 43 NNW 0 8 33 23 23 0 87 Variable 0 0 0 0 0 0 0 Total 4 113 249 254 100 38 758 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 97 of 176 F-4

LaSalle County Generating Station Period of Record: January - March 2012 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 5 14 0 0 0 0 19 NNE 2 7 0 0 0 0 9 NE 1 1 3 0 0 0 5 ENE 0 4 7 1 0 0 12 E 0 16 7 3 0 0 26 ESE 0 6 3 11 2 0 22 SE 1 3 7 9 8 0 28 SSE 0 7 12 20 6 0 45 S 0 7 13 22 8 2 52 SSW 0 3 7 21 10 1 42 SW 1 2 14 23 4 1 45 WSW 2 4 15 10 3 2 36 W 3 7 26 15 38 7 96 WNW 0 11 16 16 9 18 70 NW 1 10 3 3 0 0 17 NNW 1 8 0 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 17 110 133 154 88 31 533 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: 4 98 of 176 F-5

LaSalle County Generating Station Period of Record: January - March 2012 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 0 0 0 0 0 0 NNE 1 1 0 0 0 0 2 NE 2 1 1 0 0 0 4 ENE 0 3 0 0 0 0 3 E 0 11 6 0 0 0 17 ESE 0 9 6 1 0 0 16 SE 0 9 10 1 0 0 20 SSE 0 4 9 4 1 0 18 S 0 8 28 14 1 0 51 SSW 2 4 13 7 14 0 40 SW 1 12 10 14 0 0 37 WSW 1 9 17 10 0 0 37 W 0 16 24 7 2 0 49 WNW 1 14 13 0 0 0 28 NW 1 4 0 0 0 0 5 NNW 1 2 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 10 107 137 58 18 0 330 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 99 of 176 F-6

LaSalle County Generating Station Period of Record: January - March 2012 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 2 0 0 0 0 2 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 0 1 0 0 0 0 1 ESE 0 5 2 1 0 0 8 SE 0 12 6 0 0 0 18 SSE 0 2 10 0 0 0 12 S 0 6 15 2 0 0 23 SSW 0 6 19 5 0 0 30 SW 0 8 6 12 0 0 26 WSW 0 2 10 2 0 0 14 W 0 0 5 0 0 0 5 WNW 0 1 2 0 0 0 3 NW 0 1 0 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 1 47 75 22 0 0 145 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: 4 100 of 176 F-7

LaSalle County Generating Station Period of Record: January - March 2012 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 1 0 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 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 1 1 0 2 NW 0 0 0 0 0 3 3 NNW 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 0 1 1 1 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: 4 101 of 176 F- 8

LaSalle County Generating Station Period of Record: January - March 2012 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 2 1 0 0 3 NE 0 0 0 1 0 0 1 ENE 0 0 1 0 2 1 4 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 1 1 W 1 0 1 1 0 0 3 WNW 0 0 0 2 2 1 5 NW 0 0 0 2 0 3 5 NNW 0 0 0 0 0 2 2 Variable 0 0 0 0 0 0 0 Total 1 0 4 7 4 8 24 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: 4 102 of 176 F-9

LaSalle County Generating Station Period of Record: January - March 2012 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 3 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 3 1 0 4 ENE 0 0 1 4 10 0 15 E 0 0 0 3 0 0 3 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 4 0 2 6 SSW 0 1 0 1 1 2 5 SW 0 2 1 2 0 2 7 WSW 0 0 4 1 0 1 6 W 0 0 1 3 1 0 5 WNW 0 0 0 2 0 2 4 NW 0 0 0 2 2 4 8 NNW 0 2 0 0 1 0 3 Variable 0 0 0 0 0 0 0 Total 0 5 10 25 16 13 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: 4 103 of 176 F-10

LaSalle County Generating Station Period of Record: January - March 2012 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 8 22 17 0 5 52 NNE 2 6 17 16 1 0 42 NE 1 3 14 13 14 8 53 ENE 0 1 19 30 32 3 85 E 0 0 12 9 4 0 25 ESE 0 3 11 8 3 4 29 SE 0 3 5 11 10 11 40 SSE 0 3 3 13 9 9 37 S 0 7 7 28 27 20 89 SSW 0 2 10 23 14 29 78 SW 2 7 7 17 17 17 67 WSW 0 6 12 30 12 6 66 W 0 4 15 39 20 25 103 WNW 0 4 11 40 50 39 144 NW 0 9 25 25 22 26 107 NNW 0 2 13 35 8 18 76 Variable 0 0 0 0 0 0 0 Total 5 68 203 354 243 220 1093 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: 4 104 of 176 F-11

LaSalle County Generating Station Period of Record: January - March 2012 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 7 4 0 0 11 NNE 0 4 7 2 0 0 13 NE 1 4 4 4 0 0 13 ENE 0 0 5 6 0 0 11 E 0 5 8 12 6 0 31 ESE 0 3 3 8 3 6 23 SE 1 0 4 10 11 11 37 SSE 2 4 3 4 10 32 55 S 1 1 4 7 20 41 74 SSW 1 0 8 7 14 58 88 SW 1 3 8 6 17 22 57 WSW 1 1 8 2 19 10 41 W 1 8 10 14 21 40 94 WNW 0 5 10 10 33 57 115 NW 1 4 10 12 18 4 49 NNW 1 2 4 1 0 0 8 Variable 0 0 0 0 0 0 0 Total 11 44 103 109 172 281 720 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 12 105 of 176

LaSalle County Generating Station Period of Record: January - March 2012 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 1 4 1 0 0 7 NNE 0 1 1 0 0 0 2 NE 0 2 1 0 0 0 3 ENE 1 0 2 0 0 0 3 E 0 0 1 1 0 0 2 ESE 0 0 3 2 2 3 10 SE 0 1 1 8 1 2 13 SSE 0 1 1 1 7 7 17 S 0 2 2 3 12 13 32 SSW 0 1 3 5 10 21 40 SW 0 2 8 11 2 6 29 WSW 1 2 3 4 1 8 19 W 0 1 3 8 8 4 24 WNW 0 0 1 1 11 4 17 NW 0 0 1 4 2 0 7 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 3 14 36 49 56 68 226 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: 4 106 of 176 F-13

LaSalle County Generating Station Period of Record: January - March 2012 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 1 0 0 0 1 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 1 0 0 1 SSE 0 0 0 0 9 3 12 S 0 0 0 3 3 2 8 SSW 0 0 0 1 2 5 8 SW 0 0 1 0 0 0 1 WSW 0 0 1 0 0 8 9 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 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 4 5 14 18 41 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: 4 107 of 176 F-14

LaSalle County Generating Station Period of Record: April - June 2012 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 0 3 0 0 4 NNE 0 1 0 1 0 0 2 NE 0 0 0 3 0 0 3 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 0 1 S 0 0 0 3 3 7 13 SSW 0 0 1 11 4 0 16 SW 0 0 0 4 7 1 12 WSW 0 0 0 8 0 0 8 W 0 0 0 4 0 0 4 WNW 0 0 0 1 0 0 1 NW 0 0 0 3 0 0 3 NNW 0 0 0 1 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 2 3 42 14 8 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: 2 108 of 176 F-15

LaSalle County Generating Station Period of Record: April - June 2012 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 1 1 0 0 3 NNE 0 2 0 3 0 0 5 NE 0 0 2 11 1 0 14 ENE 0 0 2 1 0 0 3 E 0 0 1 0 1 0 2 ESE 0 0 0 2 2 0 4 SE 0 0 0 0 0 0 0 SSE 0 0 2 4 0 0 6 S 0 0 2 1 2 1 6 SSW 0 0 8 11 1 0 20 SW 0 1 3 5 3 0 12 WSW 0 0 1 4 0 0 5 W 0 0 1 0 0 0 1 WNW 0 0 3 2 0 0 5 NW 0 0 0 5 0 0 5 NNW 0 0 1 3 0 0 4 Variable 0 0 0 0 0 0 0 Total 0 4 27 53 10 1 95 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: 2 109 of 176 F-16

LaSalle County Generating Station Period of Record: April - June 2012 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 2 3 2 0 0 7 NNE 0 3 7 0 0 0 10 NE 0 0 14 8 2 0 24 ENE 0 0 5 1 0 0 6 E 0 0 0 3 2 0 5 ESE 0 0 2 0 1 0 3 SE 0 0 1 0 0 0 1 SSE 0 0 4 3 1 0 8 S 0 0 0 3 3 0 6 SSW 0 1 17 7 1 0 26 SW 0 1 5 9 1 0 16 WSW 0 0 3 9 0 0 12 W 0 1 6 1 0 0 8 WNW 0 0 5 6 0 0 11 NW 0 0 4 4 1 0 9 NNW 0 0 4 8 2 0 14 Variable 0 0 0 0 0 0 0 Total 0 8 80 64 14 0 166 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability classes: 2 110 of 176 F- 17

LaSalle County Generating Station Period of Record: April - June 2012 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 13 20 7 0 0 41 NNE 1 19 17 7 0 0 44 NE 2 24 32 39 7 0 104 ENE 1 11 22 33 10 0 77 E 0 7 22 28 12 0 69 ESE 0 4 10 11 5 0 30 SE 0 7 9 13 2 0 31 SSE 0 1 10 8 2 0 21 S 0 6 14 14 4 2 40 SSW 0 2 23 16 3 1 45 SW 0 15 15 19 3 0 52 WSW 0 9 16 8 1 2 36 W 0 21 19 10 0 1 51 WNW 1 12 20 8 1 1 43 NW 2 7 17 9 6 0 41 NNW 0 9 26 30 4 1 70 Variable 0 0 0 0 0 0 0 Total 8 167 292 260 60 8 795 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 6 Hours of missing stability measurements in all stability classes: 2 111 of 176 F-18

LaSalle County Generating Station Period of Record: April - June 2012 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 16 1 0 0 35 NNE 1 16 16 4 0 0 37 NE 1 6 14 13 0 0 34 ENE 0 3 25 21 1 0 50 E 0 10 35 5 2 0 52 ESE 0 8 9 7 0 0 24 SE 0 4 4 3 0 0 11 SSE 0 6 9 5 0 0 20 S 0 3 20 6 2 0 31 SSW 0 5 31 26 6 0 68 SW 0 3 16 8 3 1 31 WSW 1 9 10 3 1 0 24 W 1 7 13 2 3 3 29 WNW 1 4 24 3 0 6 38 NW 0 11 23 5 1 0 40 NNW 0 13 23 2 0 0 38 Variable 0 0 0 0 0 0 0 Total 5 126 288 114 19 10 562 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: 2 112 of 176 F19

LaSalle County Generating Station Period of Record: April - June 2012 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 9 1 0 0 0 10 NNE 1 5 0 0 0 0 6 NE 0 0 0 0 0 0 0 ENE 0 4 1 0 0 0 5 E 1 21 23 1 0 0 46 ESE 0 18 12 0 0 0 30 SE 0 9 4 1 0 0 14 SSE 0 5 16 1 0 0 22 S 1 6 21 3 0 0 31 SSW 0 2 21 1 0 0 24 SW 1 6 8 0 0 0 15 WSW 0 11 13 0 0 0 24 W 1 7 10 1 0 0 19 WNW 0 10 8 0 0 0 18 NW 1 4 0 0 0 0 5 NNW 1 4 2 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 7 121 140 8 0 0 276 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 4 Hours of missing stability measurements in all stability classes: 2 113 of 176 F-20

LaSalle County Generating Station Period of Record: April - June 2012 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 4 3 0 0 0 7 ESE 1 17 3 0 0 0 21 SE 0 23 13 0 0 0 36 SSE 0 18 8 0 0 0 26 S 0 12 13 0 0 0 25 SSW 0 12 13 0 0 0 25 SW 0 10 5 0 0 0 15 WSW 2 14 11 0 0 0 27 W 0 8 1 0 0 0 9 WNW 0 2 1 0 0 0 3 NW 0 2 0 0 0 0 2 NNW 1 2 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 4 124 71 0 0 0 199 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: 2 114 of 176 F-21

LaSalle County Generating Station Period of Record: April - June 2012 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 4 4 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 4 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: 2 115 of 176 F22

LaSalle County Generating Station Period of Record: April - June 2012 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 1 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 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 3 4 7 SSW 0 0 0 0 2 1 3 SW 0 0 0 0 2 6 8 WSW 0 0 0 1 1 0 2 W 0 0 0 1 1 0 2 WNW 0 0 0 1 0 0 1 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 4 10 11 25 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: 2 116 of 176 F23

LaSalle County Generating Station Period of Record: April - June 2012 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 1 3 0 4 NNE 0 0 0 0 0 1 1 NE 0 0 0 0 5 0 5 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 1 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 1 6 0 0 7 S 0 0 0 0 2 2 4 SSW 0 0 1 8 9 4 22 SW 0 0 0 4 5 5 14 WSW 0 0 0 4 2 0 6 W 0 0 0 2 5 0 7 WNW 0 0 1 1 0 0 2 NW 0 0 0 5 0 0 5 NNW 0 0 0 0 3 0 3 Variable 0 0 0 0 0 0 0 Total 0 0 4 32 34 12 82 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: 2 117 of 176 F-24

LaSalle County Generating Station Period of Record: April - June 2012 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 10 12 26 12 0 60 NNE 1 10 21 17 10 5 64 NE 3 7 21 48 62 29 170 ENE 0 6 19 36 44 10 115 E 0 5 18 16 21 17 77 ESE 1 3 7 15 12 9 47 SE 0 4 5 13 8 2 32 SSE 0 0 7 11 11 1 30 S 0 2 8 19 9 16 54 SSW 0 1 5 39 35 21 101 SW 1 6 18 21 24 6 76 WSW 0 6 17 17 9 3 52 W 0 7 17 20 6 4 54 WNW 0 8 11 28 11 8 66 NW 0 7 15 21 14 15 72 NNW 0 4 18 12 28 1 63 Variable 0 0 0 0 0 0 0 Total 6 86 219 359 316 147 1133 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: 2 118 of 176 F-25

LaSalle County Generating Station Period of Record: April - June 2012 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 2 5 11 8 4 30 NNE 0 1 6 14 3 0 24 NE 0 1 8 22 7 1 39 ENE 0 0 10 29 5 1 45 E 0 2 4 21 16 0 43 ESE 0 3 5 12 9 0 29 SE 0 1 7 9 6 4 27 SSE 0 0 1 9 6 2 18 S 0 0 6 6 22 12 46 SSW 0 0 5 8 26 45 84 SW 0 2 5 9 23 9 48 WSW 0 0 5 7 3 0 15 W 0 1 8 10 7 4 30 WNW 0 4 3 21 12 3 43 NW 0 0 4 8 18 4 34 NNW 0 2 7 12 20 1 42 Variable 0 0 0 0 0 0 0 Total 0 19 89 208 191 90 597 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: 2 119 of 176 F-26

LaSalle County Generating Station Period of Record: April - June 2012 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 0 0 2 2 2 6 NNE 2 0 2 4 0 0 8 NE 1 1 1 1 0 0 4 ENE 0 1 0 0 0 0 1 E 1 0 1 4 2 0 8 ESE 0 4 3 14 3 2 26 SE 1 0 2 24 14 2 43 SSE 0 0 3 7 11 0 21 S 0 0 4 10 14 13 41 SSW 0 4 4 7 20 10 45 SW 0 2 1 7 1 0 11 WSW 0 1 1 6 2 0 10 W 0 1 8 8 10 3 30 WNW 0 0 5 6 0 0 11 NW 2 0 4 2 7 0 15 NNW 1 1 1 0 2 0 5 Variable 0 0 0 0 0 0 0 Total 8 15 40 102 88 32 285 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: 2 120 of 176 F-27

LaSalle County Generating Station Period of Record: April - June 2012 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 0 0 0 0 SE 0 0 0 2 3 0 5 SSE 0 0 2 15 9 0 26 S 0 0 0 1 6 4 11 SSW 0 0 0 0 0 0 0 SW 0 0 0 3 1 0 4 WSW 0 0 1 0 6 0 7 W 0 0 2 0 1 0 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 5 21 26 4 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: 2 121 of 176 F2g

LaSalle County Generating Station Period of Record: July - September 2012 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 1 0 0 0 1 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 1 0 0 0 1 SE 0 0 2 0 0 0 2 SSE 0 0 3 0 0 0 3 S 0 0 0 2 1 0 3 SSW 0 0 1 3 0 0 4 SW 0 0 8 3 0 0 11 WSW 0 0 14 3 0 0 17 W 0 0 4 2 0 0 6 WNW 0 0 0 8 0 0 8 NW 0 0 1 2 0 0 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 35 23 1 0 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: 0 122 of 176 F-29

LaSalle County Generating Station Period of Record: July - September 2012 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 1 3 0 0 4 NNE 0 0 4 0 0 0 4 NE 0 0 2 1 0 0 3 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 1 8 1 0 0 10 SSE 0 1 0 0 0 0 1 S 0 0 5 2 1 0 8 SSW 0 3 7 5 0 0 15 SW 0 2 3 2 0 0 7 WSW 0 2 12 4 0 0 18 W 0 3 16 1 0 0 20 WNW 0 1 2 1 0 0 4 NW 0 0 0 1 0 0 1 NNW 0 0 3 3 0 0 6 Variable 0 0 0 0 0 0 0 Total 0 14 63 24 1 0 102 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: 0 123 of 176 F-30

LaSalle County Generating Station Period of Record: July - September 2012 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 1 4 3 0 0 8 NNE 0 0 5 0 0 0 5 NE 0 0 4 2 0 0 6 ENE 0 0 2 0 0 0 2 E 0 1 0 0 0 0 1 ESE 0 0 2 0 0 0 2 SE 0 1 2 0 0 0 3 SSE 0 4 5 0 0 0 9 S 0 2 4 2 0 0 8 SSW 0 9 6 2 0 0 17 SW 0 7 5 4 0 0 16 WSW 0 3 14 1 0 0 18 W 0 9 9 3 0 0 21 WNW 0 4 5 2 0 0 11 NW 0 1 6 4 2 0 13 NNW 0 0 7 10 0 0 17 Variable 0 0 0 0 0 0 0 Total 0 42 80 33 2 0 157 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: 0 124 of 176 F-31

LaSalle County Generating Station Period of Record: July - September 2012 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 2 15 36 9 0 0 62 NNE 3 13 14 1 0 0 31 NE 1 19 23 14 0 0 57 ENE 0 24 20 17 0 0 61 E 2 10 10 4 0 0 26 ESE 0 11 7 1 0 0 19 SE 1 21 4 1 0 0 27 SSE 0 19 7 2 0 0 28 S 2 24 23 2 1 0 52 SSW 1 15 13 0 0 0 29 SW 2 21 18 6 0 0 47 WSW 1 19 21 6 0 0 47 W 1 25 14 6 0 0 46 WNW 2 17 15 2 1 0 37 NW 0 6 26 3 3 0 38 NNW 1 19 45 32 0 0 97 Variable 0 0 0 0 0 0 0 Total 19 278 296 106 5 0 704 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: 0 125 of 176 F-32

LaSalle County Generating Station Period of Record: July - September 2012 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 26 5 1 0 0 32 NNE 2 21 13 0 0 0 36 NE 0 4 29 6 0 0 39 ENE 2 2 21 5 0 0 30 E 1 8 14 0 0 0 23 ESE 0 9 3 0 0 0 12 SE 2 2 2 0 0 0 6 SSE 2 9 4 1 0 0 16 S 1 11 7 4 0 0 23 SSW 2 6 9 3 0 0 20 SW 1 11 9 5 0 0 26 WSW 1 7 11 2 0 0 21 W 3 16 7 1 0 0 27 WNW 1 7 5 1 0 0 14 NW 0 13 16 0 0 0 29 NNW 1 16 3 2 0 0 22 Variable 0 0 0 0 0 0 0 Total 19 168 158 31 0 0 376 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: 0 126 of 176 F-33

LaSalle County Generating Station Period of Record: July - September 2012 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 2 8 0 0 0 0 10 NNE 1 4 0 0 0 0 5 NE 1 2 0 0 0 0 3 ENE 0 2 1 0 0 0 3 E 2 29 8 0 0 0 39 ESE 4 17 1 0 0 0 22 SE 2 14 4 0 0 0 20 SSE 4 8 2 0 0 0 14 S 5 11 8 0 0 0 24 SSW 2 13 19 2 0 0 36 SW 5 11 18 0 0 0 34 WSW 3 14 18 0 0 0 35 W 4 15 3 0 0 0 22 WNW 5 32 1 0 0 0 38 NW 2 13 1 0 0 0 16 NNW 6 12 3 0 0 0 21 Variable 0 0 0 0 0 0 0 Total 48 205 87 2 0 0 342 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: 0 127 of 176 F-34

LaSalle County Generating Station Period of Record: July - September 2012 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 1 0 0 0 0 1 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 1 13 0 0 0 0 14 ESE 1 28 1 0 0 0 30 SE 0 45 4 0 0 0 49 SSE 0 42 3 0 0 0 45 S 2 42 23 1 0 0 68 SSW 0 48 15 0 0 0 63 SW 3 55 7 0 0 0 65 WSW 1 48 11 0 0 0 60 W 3 34 4 0 0 0 41 WNW 0 25 0 0 0 0 25 NW 1 1 0 0 0 0 2 NNW 1 0 0 0 0 0 1 Variable 0 1 0 0 0 0 1 Total 14 384 68 1 0 0 467 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: 0 128 of 176 F-35

LaSalle County Generating Station Period of Record: July - September 2012 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 1 0 0 1 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 1 0 0 1 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: 0 129 of 176 F-36

LaSalle County Generating Station Period of Record: July - September 2012 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 1 0 0 1 NE 0 0 0 1 0 0 1 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 2 4 0 0 6 SSE 0 0 0 1 0 0 1 S 0 0 0 0 0 0 0 SSW 0 0 1 0 0 3 4 SW 0 0 4 0 0 0 4 WSW 0 0 0 3 1 0 4 W 0 0 0 2 0 0 2 WNW 0 0 0 2 1 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 0 8 16 2 3 29 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: 0 130 of 176 F -37

LaSalle County Generating Station Period of Record: July - September 2012 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 1 2 0 3 NNE 0 0 2 1 0 0 3 NE 0 0 0 3 1 0 4 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 3 2 0 0 5 SSE 0 1 1 1 0 0 3 S 0 0 3 3 2 0 8 SSW 0 0 2 0 5 2 9 SW 0 1 4 1 1 0 7 WSW 0 0 6 7 0 0 13 W 0 1 17 5 0 0 23 WNW 0 0 0 2 2 0 4 NW 0 0 0 2 1 0 3 NNW 0 0 0 3 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 4 38 31 14 2 89 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: 0 131 of 176 F-38

LaSalle County Generating Station Period of Record: July - September 2012 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 10 19 42 22 2 95 NNE 1 6 10 15 2 0 34 NE 2 13 22 27 21 4 89 ENE 0 17 9 22 18 2 68 E 1 8 4 5 4 0 22 ESE 0 11 9 2 2 0 24 SE 0 11 10 2 1 0 24 SSE 1 16 12 4 0 0 33 S 0 21 17 14 2 0 54 SSW 0 17 17 15 5 2 56 SW 1 18 24 20 5 1 69 WSW 1 11 29 16 5 0 62 W 1 20 44 18 7 0 90 WNW 0 7 24 17 2 0 50 NW 0 7 25 31 9 6 78 NNW 2 6 20 23 20 1 72 Variable 0 0 0 0 0 0 0 Total 10 199 295 273 125 18 920 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: 0 132 of 176 F-39

LaSalle County Generating Station Period of Record: July - September 2012 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 12 18 7 0 43 NNE 1 5 5 16 0 0 27 NE 0 5 9 25 12 0 51 ENE 0 0 11 20 3 0 34 E 0 5 9 19 8 0 41 ESE 0 5 10 6 3 0 24 SE 0 3 6 3 4 0 16 SSE 1 1 4 1 1 0 8 S 1 5 7 6 3 1 23 SSW 0 2 6 9 7 14 38 SW 0 4 6 9 12 12 43 WSW 1 1 7 12 9 1 31 W 0 4 7 14 3 0 28 WNW 2 5 10 8 2 0 27 NW 1 11 8 19 4 0 43 NNW 0 1 10 6 9 1 27 Variable 0 0 0 0 0 0 0 Total 8 62 127 191 87 29 504 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: 0 133 of 176 F-40

LaSalle County Generating Station Period of Record: July - September 2012 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 1 6 4 0 13 NNE 1 1 3 2 2 0 9 NE 0 2 0 2 1 0 5 ENE 1 5 2 0 0 0 8 E 3 6 4 9 3 0 25 ESE 5 1 11 18 2 0 37 SE 1 2 9 21 6 0 39 SSE 0 3 10 14 4 1 32 S 1 5 14 9 16 0 45 SSW 2 4 16 23 16 11 72 SW 0 4 15 23 12 4 58 WSW 2 1 10 28 12 0 53 W 1 0 15 16 7 0 39 WNW 1 3 11 18 1 0 34 NW 3 3 9 7 1 0 23 NNW 0 2 11 6 2 0 21 Variable 0 0 1 0 0 0 1 Total 21 44 142 202 89 16 514 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: 0 134 of 176 F-41

LaSalle County Generating Station Period of Record: July - September 2012 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 1 0 1 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 0 1 0 0 0 0 1 ESE 1 0 0 0 0 0 1 SE 0 0 2 7 1 0 10 SSE 0 0 1 8 10 0 19 S 1 0 0 8 7 3 19 SSW 0 4 4 0 13 6 27 SW 0 1 8 11 2 1 23 WSW 0 1 7 9 0 0 17 W 1 0 8 9 0 0 18 WNW 0 1 2 6 1 0 10 NW 0 0 2 1 0 0 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 4 9 34 59 35 10 151 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 F42 135 of 176

LaSalle County Generating Station Period of Record: October - December 2012 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 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 1 0 0 1 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 1 0 0 1 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: 6 136 of 176 F-43

LaSalle County Generating Station Period of Record: October - December 2012 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 0 0 0 0 0 NNE 0 0 1 0 0 0 1 NE 0 0 1 0 0 0 1 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 5 1 0 6 SW 0 0 0 1 2 0 3 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 2 6 3 0 11 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: 6 137 of 176 F-44

LaSalle County Generating Station Period of Record: October - December 2012 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 0 0 2 NNE 0 0 1 0 0 0 1 NE 0 0 1 0 0 0 1 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 1 6 3 0 10 SW 0 0 0 3 2 0 5 WSW 0 0 0 0 1 0 1 W 0 0 1 0 1 0 2 WNW 0 0 1 2 1 0 4 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 6 12 8 0 26 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: 6 138 of 176 F-45

LaSalle County Generating Station Period of Record: October - December 2012 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 25 40 11 0 0 77 NNE 0 16 23 6 0 0 45 NE 0 6 10 3 0 0 19 ENE 0 5 19 1 0 0 25 E 1 6 10 6 0 0 23 ESE 0 4 8 1 0 0 13 SE 0 1 9 4 2 0 16 SSE 0 6 18 8 3 2 37 S 0 10 29 12 7 7 65 SSW 0 14 20 27 24 0 85 SW 1 7 11 10 3 1 33 WSW 0 15 10 6 1 1 33 W 3 23 34 25 8 0 93 WNW 0 19 43 42 8 0 112 NW 2 10 37 22 6 3 80 NNW 1 24 51 24 12 2 114 Variable 0 0 0 0 0 0 0 Total 9 191 372 208 74 16 870 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: 6 139 of 176 F-46

LaSalle County Generating Station Period of Record: October December 2012 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 25 43 5 0 0 73 NNE 1 30 11 1 0 0 43 NE 0 6 12 1 0 0 19 ENE 1 4 16 3 0 0 24 E 0 5 9 10 6 0 30 ESE 1 4 3 3 1 0 12 SE 1 7 18 2 3 0 31 SSE 2 12 14 2 0 0 30 S 1 5 39 41 12 1 99 SSW 0 6 37 39 16 0 98 SW 1 17 15 18 2 0 53 WSW 3 9 26 13 0 0 51 W 2 22 34 8 2 1 69 WNW 0 23 35 5 11 23 97 NW 0 4 17 1 2 3 27 NNW 0 9 17 13 6 0 45 Variable 0 0 0 0 0 0 0 Total 13 188 346 165 61 28 801 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: 6 140 of 176 F-47

LaSalle County Generating Station Period of Record: October - December 2012 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 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 2 1 0 0 0 0 3 E 1 5 5 0 0 0 11 ESE 0 10 3 0 0 0 13 SE 0 6 5 0 0 0 11 SSE 1 6 17 0 0 0 24 S 2 7 14 6 1 0 30 SSW 0 7 31 15 0 0 53 SW 0 8 10 0 0 0 18 WSW 1 4 6 0 0 0 11 W 0 11 6 0 0 0 17 WNW 0 1 7 0 0 0 8 NW 2 3 3 0 0 0 8 NNW 0 2 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 10 80 107 21 1 0 219 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: 6 141 of 176 F-48

LaSalle County Generating Station Period of Record: October - December 2012 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 1 0 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 3 6 0 0 0 9 ESE 0 9 3 0 0 0 12 SE 1 44 6 0 0 0 51 SSE 1 36 21 0 0 0 58 S 0 27 15 0 0 0 42 SSW 0 23 30 3 0 0 56 SW 0 10 8 3 0 0 21 WSW 0 2 0 1 0 0 3 W 1 3 1 0 0 0 5 WNW 1 7 6 0 0 0 14 NW 0 0 2 0 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 5 164 98 7 0 0 274 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: 6 142 of 176 F-49

LaSalle County Generating Station Period of Record: October - December 2012 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: 6 143 of 176 F-50

LaSalle County Generating Station Period of Record: October - December 2012 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 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: 6 144 of 176 F-51

LaSalle County Generating Station Period of Record: October - December 2012 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 1 0 0 1 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 1 1 1 3 SW 0 0 0 0 1 1 2 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 1 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 0 3 3 2 8 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: 6 145 of 176 F-52

LaSalle County Generating Station Period of Record: October - December 2012 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 9 25 32 14 0 81 NNE 0 6 28 29 10 0 73 NE 0 1 19 15 3 0 38 ENE 0 1 13 20 4 0 38 E 0 2 7 6 12 7 34 ESE 1 2 11 2 1 2 19 SE 0 4 3 10 0 3 20 SSE 1 4 22 12 3 6 48 S 0 7 16 24 8 21 76 SSW 0 7 9 31 19 41 107 SW 0 6 15 6 15 11 53 WSW 1 6 18 3 9 4 41 W 1 10 26 26 21 10 94 WNW 0 6 26 34 33 37 136 NW 1 10 30 51 27 23 142 NNW 1 12 26 27 9 15 90 Variable 0 0 0 0 0 0 0 Total 7 93 294 328 188 180 1090 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 9 Hours of missing stability measurements in all stability classes: 6 146 of 176 F-53

LaSalle County Generating Station Period of Record: October - December 2012 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 1 10 16 23 2 52 NNE 0 2 6 22 6 0 36 NE 0 1 9 11 3 0 24 ENE 0 0 0 12 0 0 12 E 0 0 2 9 5 1 17 ESE 0 1 5 3 0 2 11 SE 0 1 2 6 4 5 18 SSE 0 1 6 8 13 0 28 S 0 1 3 23 25 45 97 SSW 2 3 6 14 32 55 112 SW 0 3 14 18 18 13 66 WSW 0 1 8 19 12 8 48 W 0 3 6 15 10 7 41 WNW 1 2 12 19 26 12 72 NW 0 6 10 13 13 1 43 NNW 0 2 2 3 9 5 21 Variable 0 0 0 0 0 0 0 Total 3 28 101 211 199 156 698 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 12 Hours of missing stability measurements in all stability classes: 6 147 of 176 F-54

LaSalle County Generating Station Period of Record: October - December 2012 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 2 2 0 0 0 5 NNE 0 1 2 0 0 0 3 NE 0 0 0 0 0 0 0 ENE 1 1 0 0 0 0 2 E 0 2 1 3 0 0 6 ESE 1 1 3 4 3 0 12 SE 0 0 9 7 3 0 19 SSE 0 0 2 20 9 3 34 S 0 3 5 16 17 8 49 SSW 0 0 9 13 13 23 58 SW 0 1 13 5 19 8 46 WSW 1 1 3 1 1 1 8 W 0 0 2 0 0 0 2 WNW 0 1 2 5 4 0 12 NW 0 0 0 1 10 2 13 NNW 0 1 0 1 0 0 2 Variable 0 0 0 0 0 0 0 Total 4 14 53 76 79 45 271 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: 6 148 of 176 F-55

LaSalle County Generating Station Period of Record: October - December 2012 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 2 0 0 0 0 2 SE 0 0 0 2 3 0 5 SSE 0 0 1 14 2 0 17 S 0 0 4 17 9 5 35 SSW 1 0 4 4 4 12 25 SW 0 3 7 7 1 1 19 WSW 0 1 4 3 0 0 8 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 1 0 0 0 1 1 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 2 6 20 47 20 19 114 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: 6 149 of 176 F-56

APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROG RA M 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 2012 Prepared By Teledyne Brown Engineering Environmental Services LaSalle County Station Marseilles, IL 61341 May 2013 151 of 176

Table Of Contents

1. Summary and Conclusions ............................................................................................. 1

11. 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 III. 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. Surface Water Results ...................................................................................... 10 C. Drinking Water Well Survey .............................................................................. 11 D. Summary of Results - Inter-laboratory Comparison Program .......................... 11 E. Leaks, Spills, and Releases ..............................................................................12 F. Trends ................................................................................................................12 G. Investigations .................................................................................................... 12 H. Actions Taken ................................................................................................... 12 152 of 176

Appendices Appendix A Location Designation & Distance 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, Strontium, Gross Alpha and Gross Beta in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2012. Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2012. Table B-1.3 Concentrations of Hard-to-Detects in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2012. Table B-I1.1 Concentrations of Tritium, Gross Alpha and Gross Beta in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2012. Table B-1L2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2012. ii 153 of 176

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. Following baseline sampling and subsequent recommendations, LaSalle's Radiological Groundwater Protection Program (RGPP) program now consists of the four surface water and eighteen groundwater well sampling locations. The results for LaSalle's RGPP sampling efforts in 2012 are included in this report. This is the seventh in a series of annual reports on the status of the 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 2012. During that time period, 189 analyses were performed on 82 samples from 22 locations (4 surface water and 18 groundwater 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. Strontium-89 and Strontium-90 were not detected in any groundwater samples during 2012. All gamma-emitting radionuclides attributable to licensed plant operations were not detected in any of the groundwater or surface water samples. 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 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. Levels of tritium were detected at concentrations greater than the LLD of 200 pCi/L in 7 of 18 groundwater monitoring locations. The tritium concentrations ranged from <LLD to 379,000 +/- 200 pCi/L. Elevated tritium levels (>200 pCi/L) observed are associated with the U1 CY tank leak, which occurred in June - July, 2010, and historic elevated tritium believed to be associated with the 2001 CY tank leak, as documented in the Station's 10CFR50.75(g) report. Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the first and fourth sampling in 2012. Gross Alpha (dissolved) was detected in one of the groundwater locations 154 of 176

at a concentration of 2.0 pCi/L. Gross Alpha (suspended) was detected in 2 of 11 samples affecting 2 of 10 groundwater locations analyzed. The concentrations ranged from 3.7 to 7.1 pCi/L. Gross Beta (dissolved) was detected in 10 of 12 samples affecting 8 of 10 groundwater locations analyzed. The concentrations ranged from 2.5 to 25.1 pCi/L. Gross Beta (suspended) was detected in 7 of 11 samples affecting 7 of 10 groundwater locations analyzed. The concentrations ranged from 3.7 to 17.9 pCi/L. Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on surface water samples during the fourth sampling in 2012. Gross Alpha (dissolved) was detected in one of the surface water locations at a concentration of 1.2 pCi/L. Gross Alpha (suspended) was detected in one of the four surface water locations analyzed at a concentration of 1.7 pCi/IL. Gross Beta (dissolved) was detected at all four of the surface water locations analyzed. The concentrations ranged from 9.2 to 23.7 pCi/L. Gross Beta (suspended) was detected at two of the four surface water locations analyzed. The concentrations ranged from 1.9 to 7.8 pCi/L. Hard-To-Detect analyses were performed on two of the groundwater locations to establish background levels. The analyses for groundwater included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, U-238. The isotopes of U-234 and U-238 was detected in one sample affecting 1 of 2 groundwater monitoring locations analyzed. The U-234 concentration range was 0.93 pCi/L and the U-238 concentration was 0.95 pCi/L. The levels detected are considered background.

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Introduction The LaSalle County Station (LSCS), consisting of two boiling water reactors, each rated for 3,546 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) on samples collected in 2012. A. Objectives 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. The LaSalle County Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the 3 156 of 176

surface and shallow subsurface are updated based on ongoing measurements.

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

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

4. 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 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 157 of 176

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. III. 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 2012. Sample and analysis and frequency is based upon well location, assessed risk and site hydrogeology as described in the RGPP. In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of gamma emitters in groundwater and surface water.

2. Concentrations of strontium in groundwater.

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3. Concentrations of tritium in groundwater and surface water.

4. Concentrations of Gross Alpha, Dissolved and Suspended and Gross Beta, Dissolved and Suspended in groundwater and surface water.

5. Concentrations of Am-241 in groundwater.

6. Concentrations of Cm-242 and Cm-2431244 in groundwater.

7. Concentrations of Pu-238 and PU-239/240 in groundwater.

8. Concentrations of U-234, U-235 and U-238 in groundwater.

9. Concentrations of Fe-55 in groundwater.

10. Concentrations of Ni-63 in groundwater.

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 159 of 176

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. 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-90 160 of 176

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 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 throughout 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 H-3 results have shown

  >200 pCi/L, as evidenced in LaSalle's REMP program sample results. This could be attributable to releases from Braidwood and Dresden upstream.

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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 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 onsite wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below. Tritium Samples from 18 locations were analyzed for tritium activity. Tritium values ranged from <LLD to 379,000 pCi/L at well MW-LS-1 04S. 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 (Table B-1.1, Appendix B). Strontium Nine samples from 9 groundwater locations were analyzed for Strontium -89 and Strontium -90. The results were less than the required detection limit of 10 pCi/liter for Strontium -89 and less than the required detection limit of 1.0 pCi/liter for Strontium-90 (Table B-1.1, Appendix B). 9 162 of 176

Gross Alpha and Gross Beta (dissolved and suspended) Gross Alpha (dissolved) was detected in one of the groundwater locations at a concentration of 2.0 pCi/L. Gross Alpha (suspended) was detected in 2 of 11 samples affecting 2 of 10 groundwater locations analyzed. The concentrations ranged from 3.7 to 7.1 pCi/L. Gross Beta (dissolved) was detected in 10 of 12 samples affecting 8 of 10 groundwater locations analyzed. The concentrations ranged from 2.5 to 25.1 pCi/L. Gross Beta (suspended) was detected in 7 of 11 samples affecting 7 of 10 groundwater locations analyzed. The concentrations ranged from 3.7 to 17.9 pCi/L. These concentrations of Gross Alpha and Gross Beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents (Table B-1.1, Appendix B). Gamma Emitters No gamma emitting nuclides were detected in any of the samples analyzed (Table B-1.2, Appendix B). Hard-To-Detect Hard-To-Detect analyses were performed on two groundwater locations to establish background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, and U-238. The isotopes of U-234 and U-238 was detected in one sample affecting 1 of 2 groundwater monitoring locations analyzed. The U-234 concentration was 0.93 pCi/L and the U-238 concentration was 0.95 pCi/L. The levels detected are considered background (Table B-1.3, Appendix B). All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs. B. Surface Water Results Surface Water Samples were collected from on and off-site surface water locations throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below. 163 of 176

Tritium Samples from four locations were analyzed for tritium activity. Seven of 18 samples from 2 of 4 surface water locations did show activity above 200 pCi/L. The concentrations ranged from 291 to 2,740 pCi/L. 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. These concentrations of Gross Alpha and Gross Beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents (Table B-11.1, Appendix B). Gross Alpha and Gross Beta (dissolved and suspended) Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on surface water samples during the fourth sampling in 2012. Gross Alpha (dissolved) was detected in one of the surface water locations at a concentration of 1.2 pCi/L. Gross Alpha (suspended) was detected in one of the four surface water locations analyzed at a concentration of 1.7 pCi/IL. Gross Beta (dissolved) was detected at all four of the surface water locations analyzed. The concentrations ranged from 9.2 to 23.7 pCi/L. Gross Beta (suspended) was detected at two of the four surface water locations analyzed. The concentrations ranged from 1.9 to 7.8 pCi/L (Table B-I1.1, Appendix B). Gamma Emitters No gamma emitting nuclides were detected in any of the samples analyzed. (Table B-11.2, Appendix B). C. 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. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and 164 of 176

Environmental Inc. (Midwest Labs) are presented in the AREOR. E. Leaks, Spills, and Releases There were no new leaks identified at LaSalle Station during the reporting period. F. Trends Analysis results from samples continue to be trended in order to assess impact to groundwater at LaSalle Station. There were no new leaks identified in the reporting period. Sample data from the plume arising from the 2010 U1 CY tank leak is being trended per the LaSalle RGPP. The plume had been dispersing with groundwater flow, however, an extraction well has been installed to provide additional control of the plume migration (see Section H.3). Currently, no tritium has migrated offsite, and tritium migration offsite is not expected. G. Investigations No new investigations were carried out during the reporting period. H. Actions Taken

1. Compensatory Actions No compensatory actions were taken during the reporting period.

2. Installation of Monitoring Wells Two additional monitoring wells (TW-LS-120 and TW-LS-1215) were installed in June 2012 to further evaluate the tritium plume in the area of the U1 CY tank.

3. Actions to Recover/Reverse Plumes An extraction well (RW-LS-100S), to control the migration of the tritium plume near the U1 CY tank, was installed and became operational in October 2012.

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APPENDIX A LOCATION DESIGNATION 166 of 176

TABLE A-1 LaSalle County Station Groundwater Monitoring Sample Point List, 2012 Site Site Type SW-LS-101 Surface Water SW-LS-102 Surface Water SW-LS-103 Surface Water SW-LS-104 Surface Water SW-LS-105 Surface Water SW-LS-106 Surface Water MW-LS-101S Monitoring Well MW-LS-102S Monitoring Well MW-LS-103S Monitoring Well MW-LS-104S Monitoring Well MW-LS-105S Monitoring Well MW-LS-106S Monitoring Well MW-LS-107S Monitoring Well MW-LS-1 08S Monitoring Well MW-LS-109S Monitoring Well MW-LS-1105 Monitoring Well MW-LS-111S Monitoring Well MW-LS-112S Monitoring Well MW-LS-1135 Monitoring Well H P-2 Monitoring Well H P-5 Monitoring Well H P-7 Monitoring Well HP-10 Monitoring Well RW-LS-100S Extraction Well TW-LS-114S Monitoring Well TW-LS-115S Monitoring Well TW-LS-116S Monitoring Well TW-LS-117S Monitoring Well TW-LS-118S Monitoring Well TW-LS-119S Monitoring Well TW-LS-120S Monitoring Well TW-LS-121 S Monitoring Well A-1 167 of 176

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

4 t EXELON GENERATION COMPANY. LLC FLEETWIDE ASSESSMENT MONITORING WELL LOCATIONS LaSALLE GENERATING STATION MARSEILLES. ILLINOIS ADDITIONAL MONITORING WELL LOCATION EW n KEY PLAN w.w, f 17 6unvsu X169 o f 176

APPENDIX B DATA TABLES 170 of 176

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION H-3 Sr-89 Sr-90 Gr-A (DIS) Gr-A (SUS) Gr-B (DIS) Gr-B (SUS) DATE HP-10 02/07/12 < 187 < 3.3 < 0.6 < 4.9 < 1.1 < 5.9 < 2.6 HP-10 06/11/12 < 197 HP-10 09/20/12 < 170 HP-10 12/03/12 < 189 HP-2 02/06/12 < 186 < 2.8 < 0.5 < 2.3 < 5.7 25.1 +/- 3.8 13.0 +/- 2.2 HP-2 06/11/12 < 197 HP-2 09/20/12 < 172 HP-2 12/04/12 < 195 HP-5 02/06/12 < 187 < 3.1 < 0.6 2.0 +/- 1.2 7.1 +/- 0.8 4.3 +/- 1.2 4.2 +/- 0.6 HP-5 06/11/12 < 198 HP-5 09/20/12 < 173 HP-5 12/03/12 < 194 HP-7 03/22/12 < 188 < 2.8 < 0.6 < 4.1 < 1.1 12.3 +/- 2.1 < 2.0 HP-7 06/21/12 < 199 HP-7 09/20/12 < 172 HP-7 12/04/12 < 191 MW-LS-104S 02/06/12 245000 +/- 24400 < 3.1 < 0.6 < 0.6 < 1.6 < 3.1 4.3 +/- 0.7 MW-LS-104S 06/11/12 379000 +/- 37700 MW-LS-104S 09/14/12 292000 +/- 28900 MW-LS-104S 12/03/12 290000 +/- 27000 MW-LS-105S 02/07/12 328 +/- 132 < 3.2 < 0.6 < 0.8 < 1.2 3.6 +/- 0.9 17.9 +/- 1.2 MW-LS-105S 06/11/12 < 200 MW-LS-105S 09/20/12 604 +/- 136 MW-LS-105S 12/03/12 200 +/- 128 MW-LS-106S 02/08/12 < 190 MW-LS-106S 12/05/12 < 172 < 1.5 3.7 +/- 1.7 2.5 +/- 1.1 16.4 +/- 2.5 MW-LS-107S 02/07/12 < 187 < 1.8 < 0.6 < 1.6 < 1.2 3.0 +/- 1.2 3.7 +/- 0.9 MW-LS-107S 02/07/12 Recount 5.9 +/- 3.1 MW-LS-107S 06/11/12 < 198 MW-LS-107S 09/21/12 < 171 MW-LS-107S 12/03/12 < 191 MW-LS-111 S 02/08/12 < 160 < 2.0 < 0.6 < 4.2 < 1.9 14.5 +/- 3.9 7.1 +/- 2.0 MW-LS-111 S 06/12/12 < 195 MW-LS-111S 09/21/12 < 173 MW-LS-1 11 S 12/04/12 < 189 RW-LS-100S 09/20/12 < 188 RW-LS-1005 10/23/12 < 5.5 < 0.7 RW-LS-100S 11/15/12 < 190 < 0.8 < 0.5 2.7 +/- 0.8 < 1.7 RW-LS-100S 12/15/12 2020 +/- 262 < 0.6 < 0.3 3.8 +/- 0.9 < 1.7 RW-LS-100S 12/15/12 Reanalysis 1910 +/- 257 TW-LS-114S 02/07/12 < 161 TW-LS-114S 06/21/12 < 148 TW-LS-114S 09/20/12 < 171 TW-LS-114S 12/03/12 < 195 TW-LS-115S 02/07/12 < 161 TW-LS-115S 06/11/12 < 179 TW-LS-115S 09/20/12 < 173 TW-LS-115S 12/03/12 < 190 TW-LS-116S 02/06/12 17500 +/- 1790 TW-LS-116S 06/11/12 14100 +/- 1440 TW-LS-116S 09/21/12 20000 +/- 2040 TW-LS-116S 12/03/12 14600 +/- 1510 TW-LS-117S 02/07/12 < 157 TW-LS-117S 06/11/12 < 152 B-1 171 of 176

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION H-3 Sr-89 Sr-90 Gr-A (DIS) Gr-A (SUS) Gr-B (DIS) Gr-B (SUS) DATE TW-LS-117S 09/20/12 < 174 TW-LS-117S 12/03/12 < 189 TW-LS-118S 02/06/12 297000 +/- 29100 TW-LS-118S 06/11/12 260000 +/- 25100 TW-LS-118S 09/14/12 186000 +/- 18300 TW-LS-118S 12/03/12 171000 +/- 17100 TW-LS-119S 02/07/12 658 +/- 133 TW-LS-119S 06/20/12 31400 +/- 3170 TW-LS-1 19S 06/20/12 Recount 29400 +/- 2980 TW-LS-1 19S 06/20/12 Reanalysis 28900 +/- 2930 TW-LS-119S 09/21/12 842 +/- 147 TW-LS-119S 12/03/12 1700 +/- 232 TW-LS-119S 12/03/12 Recount 1830 +/- 243 TW-LS-119S 12/03/12 Reanalysis 1600 +/- 228 TW-LS-120S 09/20/12 1760 +/- 230 TW-LS-120S 12/03/12 11100 +/- 1160 TW-LS-120S 12/03/12 Recount 11900 +/- 1230 TW-LS-120S 12/03/12 Reanalysis 10600 +/- 1110 TW-LS-121S 09/20/12 < 176 TW-LS-121S 12/07/12 < 186 B-2 172 of 176

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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 DATE HP-10 02/07/12 < 17 <2 <2 <4 <2 <3 <2 <3 <9 <2 <2 <16 <5 HP-2 02/06/12 < 20 <2 <2 <7 <2 <4 <2 <4 <12 <2 <2 <20 <7 HP-5 02/06/12 < 20 <2 <2 <5 <2 <4 <2 <4 <11 <2 <2 <19 <6 HP-7 03/22/12 < 31 <3 <3 <5 <3 <7 <4 <6 <5 <3 <3 <15 <5 MW-LS-104S 02/06/12 < 21 <2 <2 <6 <2 <4 <3 <4 <13 <2 <2 <22 <7 MW-LS-1 04S 09/14/12 <14 <1 <1 <3 <1 <2 <2 <2 <12 <1 <1 <18 <5 MW-LS-105S 02/07/12 < 15 <2 <2 <4 <1 <3 <2 <3 <9 <1 <2 <15 <5 MW-LS-106S 12/05/12 < 42 <3 <4 <11 <3 <6 <5 <8 <529 < 3 <3 <267 <81 MW-LS-107S 02/07/12 < 18 <2 <2 <4 <2 <3 <2 <3 <9 <2 <2 <17 <5 MW-LS-1 11 S 02/08/12 < 19 <2 <2 <5 <2 <4 <2 <4 <9 <2 <2 <17 <5 RW-LS-100S 11/15/12 < 29 <1 <2 <8 <1 <3 <3 <5 <1495 <1 <1 <373 <133 RW-LS-100S 12/15/12 < 26 <2 <2 <6 <2 <3 <2 <4 <168 <1 <2 <96 <29 0 BOLDED VALUES INDICATE MDC WAS NOT MET DUE TO VOLUME SUPPLIED AND AGE OF SAMPLE AND AT TIME OF RECEIPT

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Am-241 Cm-242 Cm-2431244 Pu-238 Pu-239/240 U-234 U-235 U-238 Fe-55 Ni-63 DATE MW-LS-104S 02/06/12 < 0.07 < 0.03 < 0.05 < 0.10 < 0.07 0.93 +/- 0.31 < 0.11 0.95 +/- 0.32 < 196 < 3.5 RW-LS-100S 10/23/12 < 136 < 3.3

TABLE B-I1.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION H-3 Gr-A (DIS) Gr-A (SUS) Gr-B (DIS) Gr-B (SUS) DATE SW-LS-101 02/08/12 < 190 SW-LS-101 06/12/12 < 195 SW-LS-101 09/21/12 < 169 SW-LS-101 12/04/12 < 191 < 1.1 < 0.5 9.2 +/- 1.3 < 1.6 SW-LS-102 02/08/12 639 +/- 147 SW-LS-102 06/12/12 2620 +/- 329 SW-LS-102 09/21/12 2740 +/- 323 SW-LS-102 12/04/12 1890 +/- 241 < 2.2 1.7 +/- 1.1 23.7 +/- 1.9 7.8 +/- 1.8 SW-LS-103 02/08/12 < 188 SW-LS-103 06/12/12 < 200 SW-LS-103 09/21/12 < 169 SW-LS-103 12/05/12 291 +/- 122 1.2 +/- 0.7 < 0.4 12.0 +/- 1.4 1.9 +/- 1.1 SW-LS-103 12/05/12 370 +/- 137 SW-LS-103 12/05/12 320 +/- 134 SW-LS-1 06 02/08/12 < 189 SW-LS-106 06/12/12 < 196 SW-LS-106 09/21/12 < 174 SW-LS-106 12/05/12 < 192 < 0.7 < 0.4 13.8 +/- 1.5 < 1.5

TABLE B -I1.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE 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 12/04/12 < 41 < 22 <2 <4 < 11 <2 <5 <4 <7 < 525 <2 <2 < 233 < 77 SW-LS-102 12/04/12 < 48 < 23 <3 <5 < 13 <3 <6 <5 <9 < 653 <3 <3 < 296 < 85 SW-LS-103 12/05/12 < 33 < 18 <2 <3 < 10 <2 <5 <4 <7 < 401 <2 <2 < 194 < 77 SW-LS-106 12/05/12 < 45 < 25 <3 <5 < 13 <4 <6 <5 <8 < 559 <2 <3 < 262 < 83 BOLDED VALUES INDICATE MDC WAS NOT MET DUE TO VOLUME SUPPLIED AND AGE OF SAMPLE AND AT TIME OF RECEIPT}}

RA13-021, County Station, Units I and 2, 2012 Annual Radiological Environmental Operating Report

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RA13-021, County Station, Units I and 2, 2012 Annual Radiological Environmental Operating Report

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