Text

Annual Radiological Environmental Operating Report
	ML111320602
Person / Time
Site:	LaSalle
Issue date:	05/12/2011
From:	Rhoades D; Exelon Nuclear
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	RA11-022
	Download: ML111320602 (197)
	v • d • e

LaSalle Generating Station www.exeloncorp.com 2601 North 21st Road Marseilles, I L 61341-9757 RA11-022 May 12, 2011 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-11 and NPF-1 8 NRC Docket Nos. 50-373 and 50-374

Subject:

2010 Annual Radiological Environmental Operating Report Enclosed is the Exelon Generation Company, LLC, LaSalle County Station 2010 Annual Radiological Environmental Operating Report, submitted in accordance with Technical Specification 5.6.2, "Annual Radiological Environmental Operating Report." This report contains the results of the Radiological Environmental and Meteorological Monitoring Programs. This report is enclosed as an attachment.

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

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

Respectfully, David P. Rhoades Site Vice President LaSalle County Station Attachment cc:

Regional Administrator - NRC Region III NRC Senior Resident Inspector - LaSalle County Station Nuclear 10 CFR 50 Appendix I

Docket No:

50-373 50-374 LASALLE COUNTY STATION UN ITS and Annual Radiological Environmental Operating Report 1 January Through 31 December 2010 Prepared By Teledyne Brown Engineering Environmental Services sr Nuclear LaSalle County Station Marseilles, IL 61341 May 2011 1 of 196

Table Of Contents

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

11. Introduction..................................................................................................................... 2 A. Objectives of the REMP...................................................................................... 2 B. Implementation of the Objectives........................................................................ 2 III. Program Description...................................................................................................... 2 A. Sample Collection............................................................................................... 2 B. Sample Analysis.................................................................................................. 4 C. Data Interpretation.............................................................................................. 5 D. Program Exceptions............................................................................................ 6 E. Program Changes............................................................................................... 7 IV. Results and Discussion................................................................................................. 7 A. Aquatic Environment........................................................................................... 7 1.

Surface Water........................................................................................... 7 2.

Ground/well Water.................................................................................... 8

3. Fish........................................................................................................... 8

4. Sediment................................................................................................... 9 B. Atmospheric Environment................................................................................... 9

1. Airborne.................................................................................................... 9

a. Air Particulates............................................................................... 9

b. Airborne Iodine............................................................................10

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

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

b. Food Products.............................................................................11 C. Ambient Gamma Radiation...............................................................................11 D. Land Use Survey............................................................................................... 12 E. Summary of Results - Inter-laboratory Comparison Program.......................... 12 i

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Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Summary for the LaSalle County Station, 2010 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, 2010 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2010 Figures Figure B-1 Inner Ring TLD Locations of the LaSalle County Station, 2010 Figure B-2 Outer Ring TLD Locations of the LaSalle County Station, 2010 Figure B-3 Fixed Air Sampling Locations of the LaSalle County Station, 2010 Figure B-4 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2010 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, 2010.

Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2010.

Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2010.

Table C-11.1 Concentrations of Tritium in Ground/well Water Samples Collected in the Vicinity of LaSalle County Station, 2010 Table C-11.2 Concentrations of Gamma Emitters in Ground/well Water Samples Collected in the Vicinity of LaSalle County Station, 2010.

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Table C-111.1 Table C-IV.1 Table C-V.1 Table C-V.2 Table C-V.3 Table C-V1.1 Table C-VI1.1 Table C-VI1.2 Table C-VI11.1 Table C-1X.1 Table C-IX.2 Table C-IX.3 Figures Figure C-1 Figure C-2 Figure C-3 Figure C-4 Figure C-5 Figure C-6 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of LaSalle County Station, 2010.

Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of LaSalle County Station, 2010.

Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2010.

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, 2010.

Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2010.

Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of LaSalle County Station, 2010.

Concentrations of 1-131 in Milk Samples Collected in the Vicinity of LaSalle County Station, 2010.

Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of LaSalle County Station, 2010.

Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of LaSalle County Station, 2010.

Quarterly TLD Results for LaSalle County Station, 2010.

Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Other and Control Locations for LaSalle County Station, 2010.

Summary of the Ambient Dosimetry Program for LaSalle County Station, 2010.

Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2000 - 2010.

Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2000 - 2010.

Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2000 - 2010.

Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2000 - 2010.

Air Particulate - Gross Beta - Station L-1 0 (C) Collected in the Vicinity of LSCS, 2000 - 2010.

Air Particulate - Gross Beta - Station L -04 and L-07 Collected in the Vicinity of LSCS, 2010.

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Figure C-7 Air Particulate - Gross Beta - Station L-08 and L-11 Collected in the Vicinity of LSCS, 2010.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2010 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2010 Table D-3 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2010 Table D-4 ERA Statistical Summary Proficiency Testing Program Environmental, Inc., 2010 Table D-5 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Environmental, Inc., 2010 Appendix E Effluent Data Appendix F Meteorological Data Appendix G Annual Radiological Groundwater Protection Program Report (ARGPPR) iv 5 of 196

I.

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 2010 through 31 December 2010. During that time period, 1,516 analyses were performed on 1,355 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. Sediment samples had Cs-137 concentrations consistent with levels observed during the preoperational years. No plant produced fission or activation products were found in sediment.

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

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

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

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

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

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

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1 1.

Introduction The LaSalle County Station (LSCS), consisting of two boiling water reactors, each rated for 3546 MWt, owned and operated by Exelon Corporation, is located in LaSalle County, Illinois. Unit No. 1 went critical on 16 March 1982. Unit No. 2 went critical on 02 December 1983. The site is located in northern Illinois, approximately 75 miles southwest of Chicago, Illinois.

A Radiological Environmental Monitoring Program (REMP) for 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), Mirion Technologies, and Environmental Inc. (Midwest Labs) on samples collected during the period 1 January 2010 through 31 December 2010.

A.

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

1.

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

2.

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

B.

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

1.

Identifying significant exposure pathways.

2.

Establishing baseline radiological data of media within those pathways.

3.

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

III.

Program Description A.

Sample Collection Samples for the LSCS REMP were collected for Exelon Nuclear by 7 of 196

Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. (Midwest Labs) to obtain environmental samples for the LSCS REMP in 2010. Sample locations and descriptions can be found in Tables B-1 and B-2, and Figures B-1 through B-4, Appendix B.

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

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, milk and food products. Airborne iodine and particulate samples were collected and analyzed weekly at nine locations (L-01, L-03, L-04, L-05, L-06, L-07, L-08, L-10 and L-1 1). The control location was L-1 0. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air filters and air iodine samples were replaced weekly and sent to the laboratory for analysis.

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

Food products were collected annually in September at five locations (L-Quad C, L-Quad 1, L-Quad 2, L-Quad 3, and L-Quad 4). The control location was L-Quad C. Various types of samples were collected and placed in new unused plastic bags, and sent to the laboratory for analysis. 8of196

Ambient Gamma Radiation Direct radiation measurements were made using CaF2 thermoluminescent dosimeters (TLD). Each location consisted of 2 TLD sets. The TLD locations were placed on and around the 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-115 and L-116) 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-211, L-212, L-213, L-214, L-215 and L-216) extending to approximately 5 miles from the site designed to measure possible exposures to close -in population.

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

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

The specific TLD locations were determined by the following criteria:

1.

The presence of relatively dense population; 2.

Site meteorological data taking into account distance and elevation for each of the sixteen-22 1/2 degree sectors around the site, where estimated annual dose from LSCS, if any, would be most significant; 3.

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

4.

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

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

B.

Sample Analysis This section describes the general analytical methodologies used by TBE and Environmental Inc (Midwest Labs) to analyze the environmental 9of196

samples for radioactivity for the LSCS REMP in 2010. The analytical procedures used by the laboratories are listed in Table B-2.

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

1.

Concentrations of beta emitters in surface water and air particulates.

2.

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

3.

Concentrations of tritium in ground/well and surface water.

4.

Concentrations of 1-131 in air and milk.

5.

Ambient gamma radiation levels at various site environs.

C.

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

1.

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

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2.

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

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

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

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

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

D.

Program Exceptions For 2010 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 All L-03 02/11/10 No apparent reason for low reading of 166.7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months .

All L-10 05/13/10 Low reading of 156.8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months possibly due to power outages in the area.

A/I L-10 06/03/10 No apparent reason for low reading of 113.9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months .

A/I L-1 0 06/10/10 Sampler hit by tornado; collector repaired damage; ComEd restored power on 06/11/10. Estimated flow 60 CFH.

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Table D-1 LISTING OF SAMPLE ANOMALIES (continued)

Sample Location Collection Reason Type Code Date A/I L-10 06/17/10 Low reading of 143.7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months due to startup on 06/11/10 after damage repair.

A/I L-01 07/08/10 No apparent reason for low reading of 149.9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months .

A/I L-07 07/29/10 No apparent reason for low reading of 159.6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; power outages reported in area.

Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date There were no missed samples in 2010.

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

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

E.

Program Changes There were no program changes in 2010.

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. 12 of 196

Gross Beta Samples from all locations were analyzed for concentrations of gross beta (Table C-1.1, Appendix C). Gross beta was detected in all samples with a range of 5.3 to 10.6 pCi/I. 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 two of eight samples with a range of 271 to 364 pCi/I.

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

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

2.

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

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

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

3.

Fish Fish samples comprised of channel catfish, blue catfish, common 8

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

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

Naturally occurring K-40 was found at all stations and ranged from 1,110 to 4,390 pCi/kg wet. No fission or activation products were found.

4.

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

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

Potassium-40 was found at all stations and ranged from 10,200 to 14,700 pCi/kg dry. Cs-137 was found in one sample at a concentration of 127 pCi/kg dry. The activity detected was consistent with those detected in previous years and is likely due to fallout from above-ground nuclear weapons testing. No LaSalle fission or activation products were found.

B.

Atmospheric Environment 1.

Airborne a.

Air Particulates Continuous air particulate samples were collected from nine locations on a weekly basis. The nine locations were separated into four groups: Group I (onsite) represents locations within the 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 III (far field) represents the control location at an intermediate distance from LSCS 14 of 196

(L-04, L-07, L-08 and L-1 1) 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 1) ranged from 7 to 39 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3. The results from the near site location (Group II) ranged from 7 to 39 E-3 pCi/m3 with a mean of 19 E-3 pCi/m3. The results from the far field locations (Group III) ranged from 6 to 43 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3. The results from the Control location (Group IV) ranged from 8 to 43 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3. Comparison of the 2010 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 a comparison of the weekly mean values for 2010 indicate no notable differences among the three groups.

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

Naturally occurring Be-7 due to cosmic ray activity was detected in all samples. These values ranged from 90 to 277 E-3 pCi/m3. Naturally occurring K-40 was detected in one sample at a concentration of 34 E-3 pCi/m3. All other nuclides were less than the MDC.

b.

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

No nuclides were detected, and all required LLDs were met. 15 of 196

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-VII.2, Appendix C).

Naturally occurring K-40 activity was found in all samples and ranged from 1,070 to 1,480 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-VIII.1, Appendix C). No nuclides were detected, and all required LLDs were met.

C.

Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Panasonic 814 (CaF2) thermoluminescent dosimeters.

Forty-one TLD locations were established around the site. Results of TLD measurements are listed in Tables C-IX.1 to C-IX.3, Appendix C.

Most TLD measurements were below 30 mR/standard month, with a range of 19 to 40 mR/quarter. A comparison of the Inner Ring, Outer 16 of 196

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 2010 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 distance of the Milk Farm in the E sector was listed in previous reports with a distance of 12.6 miles. After resurveying, the distance was verified to be 14.2 miles, which is consistent with data listed in the LSCS Offsite Dose Calculation Manual (ODCM), and the corrected distance is now listed. The results of this survey are summarized below.

Distance in Miles from the LSCS Reactor Buildings Sector Residence Livestock Milk Farm Miles Miles Miles A N 3.9 4.0 B NNE 1.6 1.7 C N E 2.1 3.5 D ENE 3.3 3.8 E E 3.2 14.2 F ESE 1.4 G SE 1.7 4.7 H SSE 1.8 4.7 J S 1.5 4.7 K SSW 0.7 L SW 1.0 5.8 MWSW 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 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 17 of 196

and water matrices (Appendix D). The PE samples, supplied by Analytics Inc., Environmental Resource Associates (ERA) and DOE's Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

1.

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

2.

ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, NELAC, state specific PT program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

3.

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

The MAPEP defines three levels of performance: Acceptable (flag = "A"), Acceptable with Warning (flag = "W"), and Not Acceptable (flag = "N"). Performance is considered acceptable when a mean result for the specified analyte is +/- 20% of the reference value. Performance is acceptable with warning when a mean result falls in the range from +/-20% to +/-30% of the reference value (i.e., 20% < bias < 30%). If the bias is greater than 30%, the results are deemed not acceptable.

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

1. Teledyne Brown Engineering's ERA November 2010 Sr-89 in water result of 77. 8 pCi/L was higher than the known value of 68.5 pCi/L, resulting in a found to known ratio of 1.14. NCR 10-09 was initiated to investigate this failure. Since the ratio of 1.14 fell within 18 of 196

an acceptance range of 20%, Teledyne considers this an acceptable result.

2.

Teledyne Brown Engineering's ERA November 2010 Zn-65 in water result of 11.0 pCi/L was lower than the known value of 102 pCi/L. NCR 10-09 was initiated to investigate this failure. The Zn-65 result of 111 was incorrectly reported as 11.0.

For the secondary laboratory, Environmental, Inc., 14 out of 14 analytes met the specified acceptance criteria.

The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data. 19 of 196

APPENDIX RAD IOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

LOCATION OF FACILITY:

MARSEILLES IL REPORTING PERIOD:

INDICATOR CONTROL LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F)

(F)

(UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE MEASUREMENT)

(LLD)

GR-B 24 4

7.6 7.3 (12/12)

(12/12)

(5.3/10.4)

(5.4/10.6)

H-3 8

200 271 364 (1/4)

(1/4) 50-373 & 50-374 ANNUAL 2010 LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEAN (M)

STATION #

NUMBER OF (F)

NAME NONROUTINE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENTS 7.6 L40 INDICATOR (12/12)

ILLINOIS RIVER - DOWNSTREAM (5.3/10.4) 5.2 MILES NNW OF SITE 364 L-21 CONTROL (1/4)

ILLINOIS RIVER AT SENECA - UPSTREAM 4.0 MILES NE OF SITE SURFACE WATER (PCULITER) 0 0

GAMMA 24 MN-54 15

<LLD

<LLD 0

0 CO-58 15

<LLD

<LLD FE-59 30

<LLD

<LLD CO-60 15

<LLD

<LLD ZN-65 30

<LLD

<LLD NB-95 15

<LLD

<LLD 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) 0 0

0 0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (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 (PC]/LITER) 1-131 15

<LLD

<LLD CS-134 15

<LLD

<LLD CS-137 18

<LLD

<LLD BA-140 60

<LLD

<LLD LA-140 15

<LLD

<LLD 0

0 0

0 GROUND WATER (PCI/LITER) 1-1-3 12 200

<LLD

<LLD 0

GAMMA 12 MN-54 15

<LLD

<LLD 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) 0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (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 (PCI/LITER)

FE-59 30

<LLD

<LLD CO-60 15

<LLD

<LLD ZN-65 30

<LLD

<LLD NB-95 15

<LLD

<LLD ZR-95 30

<LLD

<LLD CS-134 15

<LLD

<LLD CS-137 18

<LLD

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) 0 0

0 0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (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 (PCI/LITER)

LA-140 15

<LLD

<LLD FISH GAMMA 12 (PCI/KG WET)

MN-54 130

<LLD

<LLD CO-58 130

<LLD

<LLD FE-59 260

<LLD

<LLD CO-60 130

<LLD

<LLD ZN-65 260

<LLD

<LLD NB-95 NA

<LLD

<LLD 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) 0 0

0 0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (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 (PCI/KG WET)

CS-134 130

<LLD

<LLD CS-137 150

<LLD

<LLD BA-140 NA

<LLD

<LLD LA-140 NA

<LLD

<LLD SEDIMENT GAMMA 6

(PCUKG DRY)

MN-54 NA

<LLD

<LLD CO-58 NA

<LLD

<LLD FE-59 NA

<LLD

<LLD 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) 0 0

0 0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (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

(PCI/KG DRY)

ZN-65 NA

<LLD

<LLD NB-95 NA

<LLD

<LLD ZR-95 NA

<LLD

<LLD CS-134 150

<LLD

<LLD CS-137 180

<LLD 127 127 L-21 CONTROL (1/2)

(1/2)

ILLINOIS RIVER AT SENECA - UPSTREAM 4.0 MILES NE OF SITE BA-140 NA

<LLD

<LLD LA-140 NA

<LLD

<LLD 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) 0 0

0 0

0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F)

(F)

NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT)

(LLD)

MEASUREMENTS GR-B 468 10 20 20 20 L-10 CONTROL 0

(414/416)

(50/52)

STREATOR (6/43)

(8/43)

(8/43) 13.5 MILES SW OF SITE GAMMA 36 MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD FE-59 NA

<LLD

<LLD CO-60 NA

<LLD

<LLD ZN-65 NA

<LLD

<LLD NB-95 NA

<LLD

<LLD ZR-95 NA

<LLD

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)

AIR PARTICULATE (E-3 PCUCU.METER) 0 0

0 0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (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 (E-3 PCUCU. METER)

CS-137 60

<LLD

<LLD BA-140 NA

<LLD

<LLD LA-140 NA

<LLD

<LLD AIR IODINE GAMMA 468 (E-3 PCI/CU.METER) 1-131 70

<LLD

<LLD MILK 1-131 19 1

NA

<LLD (PCI/LITER) 0 0

0 0

GAMMA 19 MN-54 NA NA 0

<LLD 0

CO-58 NA NA

<LLD

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, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F)

(F)

NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT)

(LLD)

MEASUREMENTS FE-59 NA NA CO-60 NA NA ZN-65 NA NA NB-95 NA NA ZR-95 NA NA CS-134 15 NA CS-137 18 NA BA-140 60 NA 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)

MILK (PCULITER)

<LLD

<LLD 0

0 0

0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F)

(F)

NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT)

(LLD)

MEASUREMENTS MILK (PCULITER)

LA-140 15 NA 0

<LLD VEGETATION GAMMA 10 (PCI/KG WET)

MN-54 NA

<LLD

<LLD CO-58 NA

<LLD

<LLD FE-59 NA

<LLD

<LLD CO-60 NA

<LLD

<LLD ZN-65 NA

<LLD

<LLD NB-95 NA

<LLD

<LLD ZR-95 NA

<LLD

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) 0 0

0 0

0

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2010 NAME OF FACILITY:

LASALLE DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES IL REPORTING PERIOD:

ANNUAL 2010 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M)

MEAN (M)

STATION #

NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (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 (PCUKG WET)

CS-134 60

<LLD

<LLD CS-137 80

<LLD

<LLD BA-140 NA

<LLD

<LLD LA-140 NA

<LLD

<LLD DIRECT RADIATION TLD-QUARTERLY 336 NA 28.5 24.8 31.5 L-105-I INDICATOR (MILLI-ROENTGEN/QTR.)

(328/328)

(8/8)

(4/4)

(18/40)

(19/32)

(26/40) 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) 0 0

0 0

APPENDIX LOCATION DESIGNATION, DISTANCE & DIRECTION, AN D SAMPLE COLLECTION & ANALYTICAL METHODS 32 of 196

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2010 Location Location Description Distance & Direction From Site A.

Surface Water L-21 Illinois River at Seneca, Upstream (control) 4.0 miles NE L-40 Illinois River, Downstream (indicator) 5.2 miles NNW B.

Ground/Well Water L-27 LSCS Onsite Well (indicator) 0 miles at station L-28-W4 Marseilles Well (control) 7.0 miles NW L-28-W5 Marseilles Well (control) 6.7 miles NW L-28-W6 Marseilles Well (indicator) 4.1 miles NNE C.

Milk - bi-weekly / monthly L-42 Biros Farm (control) 14.2 miles E D.

Air Particulates / Air Iodine L-01 Nearsite 1 (indicator) 1.5 miles NNW L-03 Onsite 3 (indicator) 1.0 miles ENE L-04 Rte. 170 (indicator) 3.2 miles E L-05 Onsite 5 (indicator) 0.3 miles ESE L-06 Nearsite 6 (indicator) 0.4 miles WSW L-07 Seneca (indicator) 5.2 miles NNE L-08 Marseilles (indicator) 6.0 miles NNW L-10 Streator (control) 13.5 miles SW L-1 1 Ransom (indicator) 6.0 miles S E.

Fish L-34 LaSalle Cooling Lake (indicator) 2.0 miles E L-35 Marseilles Pool of Illinois River, Downstream (indicator) 6.5 miles NW L-36 Illinois River, Upstream of Discharge (control) 4.3 miles NNE F.

Sediment L-21 Illinois River at Seneca, Upstream (control) 4.0 miles NE L-40 Illinois River, Downstream (indicator) 5.2 miles NNW L-41 Illinois River, Downstream (indicator) 4.6 miles NNW G.

Food Products Quadrant 1 Diane Partridge 4.5 miles NE Quadrant 2 Mike and Gina Welbourne 3.8 miles ESE Quadrant 3 Michael Olson 1.5 miles WSW Quadrant 4 Robert Eisers 4.5 miles NW Control Eugene Clements 10.0 miles NW B-1 33 of 196

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2010 Location Location Description Distance & Direction From Site H.

Environmental Dosimetry - TLD Inner Ring L-101-1 and -2 L-1 02-1 and -2 L-1 03-1 and -2 L-1 04-1 and -2 L-105-1 and -2 L-106-1 and -2 L-107-1 and -2 L-108-1 and -2 L-1 09-1 and -2 L-110-1 and -2 L-111 b-1 and -2 L-112-1 and -2 L-113a-1 and -2 L-114-1 and -2 L-115-1 and -2 L-116-1 and -2 Outer Ring L-201-3 and -4 L-202-3 and -4 L-203-1 and -2 L-204-1 and -2 L-205-1 and -2 L-205-3 and -4 L-206-1 and -2 L-207-1 and -2 L-208-1 and -2 L-209-1 and -2 L-210-1 and -2 L-211-1 and -2 L-212-1 and -2 L-213-3 and -4 L-214-3 and -4 L-215-3 and -4 L-216-3 and -4 Other 0.5 miles N 0.6 miles NNE 0.7 miles NE 0.8 miles ENE 0.7 miles E 1.4 miles ESE 0.8 miles SE 0.5 miles SSE 0.6 miles S 0.6 miles SSW 0.8 miles SW 0.9 miles WSW 0.8 miles W 0.9 miles WNW 0.7 miles NW 0.6 miles NNW 4.0 miles N 3.6 miles NNE 4.0 miles NE 3.2 miles ENE 3.2 miles ESE 5.1 miles E 4.3 miles SE 4.5 miles SSE 4.5 miles S 4.0 miles SSW 3.3 miles SW 4.5 miles WSW 4.0 miles WSW 4.9 miles W 5.1 miles WNW 5.0 miles NW 5.0 miles NNW L-01-1 and -2 L-03-1 and -2 L-04-1 and -2 L-05-1 and -2 L-06-1 and -2 L-07-1 and -2 L-08-1 and -2 L-11-1 and -2 Nearsite 1 (indicator)

Onsite 3 (indicator)

Rte. 170 (indicator)

Onsite 5 (indicator)

Nearsite 6 (indicator)

Seneca (indicator)

Marseilles (indicator)

Ransom (indicator) 1.5 miles NNW 1.0 miles ENE 3.2 miles E 0.3 miles ESE 0.4 miles WSW 5.2 miles NNE 6.0 miles NNW 6.0 miles S Control and Special Interest L-10-1 and -2 Streator 13.5 miles SW B-2 34 of 196

TABLE B-2:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2010 Sample Medium Analysis Sampling 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 spectroscopy Surface Water Gross Beta Monthly composite TBE, TBE-2008 Gross Alpha and/or gross beta activity in from weekly grab various matrices samples.

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

Surface Water Tritium Quarterly composite TBE, TBE-2011 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 gamma spectroscopy 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 techniques gamma spectroscopy Sediment Gamma Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy samples Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy 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 gross 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 spectroscopy 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 gamma spectroscopy (batch method)

Milk 1-131 Bi-weekly grab sample TBE, TBE-2012 Radioiodine in various matrices when cows are on pasture. Monthly all Env. Inc., 1-131-01 Determination of I-131 in milk by anion other times exchange 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 spectroscopy Food Products Gamma Annual grab samples.

TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy TLD Thermoluminescence Quarterly TLDs Mirion Technologies Dosimetry comprised of two Mirioin Technologies CaF2 elements.

B-3 35 of 196

U U i t

I A

Allllll x TW Local b" Figure B-1 Inner Ring TLD Locations of the LaSalle County Station, 2010 i

w B-4 36 of 196

i set Sutton Figure B-2 Outer Ring TLD Locations of the LaSalle County Station, 2010 B-5 37 of 196

Figure B-3 Fixed Air Sampling Locations of the LaSalle County Station, 2010 B-6 38 of 196

I a

k Fish W Milk 4

Sediment Water Figure B-4 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2010 B-7 39 of 196

APPENDIX C DATA TABLES FIGURES PRIMARY LABORATORY

TABLE C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-21 L-40 PERIOD 01/07/10 - 01/28/10 7.0 +/- 2.5 7.4 +/- 2.6 02/04/10 - 02/25/10 5.5 +/- 3.3 7.8 +/- 3.7 03/04/10 - 03/25/10 5.7 +/- 2.2 6.3 +/- 2.4 04/08/10 - 04/28/10 7.9 +/- 2.7 7.3 +/- 2.7 05/06/10 - 05/27/10 5.4 +/- 2.4 5.3 +/- 2.4 06/03/10 - 06/24/10 5.4 +/- 2.2 5.7 +/- 2.3 07/01/10 - 07/29/10 10.6 +/- 2.3 7.7 +/- 2.1 08/05/10 - 08/26/10 7.2 +/- 2.4 6.6 +/- 2.4 09/02/10 - 09/29/10 6.4 +/- 2.2 7.6 +/- 2.3 10/07/10 - 10/28/10 7.9 +/- 2.4 8.9 +/- 2.6 11/04/10 - 11/24/10 9.7 +/- 2.4 10.4 +/- 2.4 12/02/10 - 12/29/10 9.0 +/- 3.2 10.3 +/- 3.3 MEAN 7.3 +/- 3.5 7.6 +/- 3.2 TABLE C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-21 L-40 PERIOD 01/07/10 - 03/25/10

< 178

< 182 04/01/10 - 06/24/10

< 162

< 156 07/01/10 - 09/29/10

< 193

< 190 10/07/10 - 12/29/10 364 +/- 123 271 +/- 118 MEAN

THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-1 41 of 196

TABLE C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-21 01/07/10 -01/28/10

<3

<8

<3

<6

<3

<6

<14

<3

<27

<9 02/04/10 - 02/25/10

< 3

< 8

< 3

< 8

< 4

< 7

< 15

< 3

< 4

< 32

< 7 03/04/10 - 03/25/10

< 2

< 5

< 2

< 4

< 3

<4

< 15

< 2

< 22

< 7 04/08/10 - 04/28/10

< 2

< 5

< 2

< 4

< 2

< 4

< 14

< 2

< 25

< 7 05/06/10 - 05/27/10

< 2

< 6

< 2

< 3

< 2

< 4

< 10

< 2

< 15

< 4 06/03/10 - 06/24/10

< 2

< 5

< 2

< 4

< 2

< 4

< 14

< 2

< 23

< 7 07/01/10 -07/29/10

<1

<2

<4

<1

<3

<2

<3

<14

<2

<1

<22

<6 08/05/10 - 08/26/10

< 1

< 3

< 1

< 3

< 2

< 3

< 13

< 1

< 18

< 6 09/02/10 -09/29/10

<1

<3

<1

<2

<3

<13

<1

<19

<6 10/07/10 - 10/28/10

< 2

< 4

< 2

< 3

< 2

< 3

< 11

< 1

< 2

< 19

< 6 11/04/10 - 11/24/10

< 2

< 5

< 2

< 4

< 2

< 4

< 13

< 2

< 21

< 7 12/02/10 - 12/29/10

<1

<2

<1

<2

<1

<2

<9

<1

<13

<4 MEAN L-40 01/07/10 - 01/28/10

< 3

< 7

< 3

< 6

<4

< 6

< 14

< 3

< 26

< 6 02/04/10 - 02/25/10

< 3

< 7

< 3

< 5

< 3

< 5

< 13

< 3

< 26

< 7 03/04/10 - 03/25/10

< 2

< 5

< 2

< 4

< 2

< 4

< 15

< 2

< 22

< 7 04/08/10 - 04/28/10

< 2

< 5

< 2

< 4

< 2

< 4

< 13

< 2

< 23

< 8 05/06/10 - 05/27/10

< 1

< 2

< 4

< 2

< 3

< 2

< 3

< 13

< 1

< 2

< 18

< 7 06/03/10 - 06/24/10

< 2

< 5

< 2

< 4

< 2

< 4

< 12

< 2

< 19

< 7 07/01/10 - 07/29/10

<1

< 3

<1

< 2

< 3

< 11

< 1

<1

< 17

< 5 08/05/10 - 08/26/10

< 1

< 2

< 3

< 1

< 3

< 2

< 3

< 13

< 1

< 18

< 6 09/02/10 - 09/29/10

< 1

< 3

< 1

< 2

< 1

< 3

< 15

< 1

< 19

< 6 10/07/10 - 10/28/10

<2

<4

<2

<3

<2

<3

<13

<1

<2

<19

<6 11/04/10 - 11/24/10

< 2

< 5

< 2

< 3

< 2

<4

< 12

< 2

< 20

< 6 12/02/10 - 12/29/10

<1

<3

<1

<2

<1

<2

<9

<1

<14

<4 MEAN

TABLE C-II.1 CONCENTRATIONS OF TRITIUM IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION L-27 L-28-W4 L-28-W5 L-28-W6 PERIOD 01/14/10 - 01/14/10

< 177

< 195

< 190 04/08/10 - 04/08/10

< 163

< 162 07/08/10 - 07/08/10

< 161

< 155

< 162 10/14/10 - 10/14/10

< 198

< 200

< 195 MEAN

TABLE C-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-27 01/14/10 - 01/14/10

< 4

< 10

< 5

< 9

< 5

< 8

< 4

< 5

< 33

< 12 04/08/10 - 04/08/10

< 4

< 5

< 11

< 4

< 9

< 6

< 8

< 4

< 23

< 9 07/08/10 - 07/08/10

< 5

<4

< 9

<4

< 10

< 5

< 9

<4

< 5

< 21

< 7 10/14/10 - 10/14/10

<3

<8

<3

<6

<3

<6

<3

<24

<6 MEAN L-28-W4 04/08/10 - 04/08/10

< 5

< 10

< 4

< 9

< 5

< 9

< 5

< 4

< 29

< 10 10/14/10 - 10/14/10

< 3

< 7

< 4

< 6

< 3

< 6

< 3

< 25

< 7 MEAN L-28-W5 01/14/10 - 01/14/10

< 4

< 9

< 4

< 8

< 5

< 7

< 3

< 4

< 27

< 8 07/08/10 - 07/08/10

< 8

< 7

< 14

< 7

< 17

< 8

< 12

< 7

< 8

< 37

< 15 MEAN L-28-W6 01/14/10 - 01/14/10

< 4

< 8

< 3

< 8

< 4

< 7

< 3

< 4

< 25

< 7 04/08/10 - 04/08/10

< 4

< 8

< 3

< 7

< 4

< 7

< 3

< 4

< 25

< 9 07/08/10 - 07/08/10

< 5

< 8

< 6

< 12

< 6

< 9

< 5

< 4

< 30

< 9 10/14/10 - 10/14/10

<3

<4

<9

<4

<8

<5

<7

<3

<4

<30

<8 MEAN

TABLE C-111.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PC/KG WET +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-34 Common Carp 05/17/10

< 58

< 72

< 143

< 47

< 87

< 69

< 117

< 44

< 48

< 1390

< 305 Largemouth Bass 05/17/10

< 48

< 52

< 159

< 35

< 91

< 63

< 103

< 43

< 1130

< 292 Blue catfish 10/11/10

< 47

< 51

< 89

< 46

< 91

< 48

< 83

< 45

< 48

< 235

< 82 Largemouth Bass 10/11/10

< 44

< 34

< 84

< 49

< 109

< 50

< 84

< 39

< 47

< 254

< 80 MEAN L-35 Channel Catfish 05/17/10

< 25

< 39

< 84

< 37

< 55

< 40

< 51

< 21

< 27

< 539

< 141 Freshwater Drum 05/17/10

< 55

< 64

< 157

< 49

< 125

< 75

< 121

< 65

< 54

< 1410

< 420 Channel Catfish 10/11/10

< 11

< 12

< 24

< 15

< 29

< 12

< 18

< 10

< 11

< 54

< 20 Smallmouth buffalo 10/11/10

< 40

< 46

< 92

< 44

< 94

< 51

< 83

< 44

< 48

< 251

< 81 MEAN L-36 Channel Catfish 05/17/10

< 39

< 51

< 120

< 32

< 81

< 50

< 83

< 32

< 34

< 794

< 135 Freshwater Drum 05/17/10

< 50

< 54

< 148

< 55

< 95

< 59

< 100

< 41

< 56

< 1160

< 302 Channel Catfish 10/11/10

< 20

< 17

< 37

< 19

< 49

< 27

< 32

< 21

< 22

< 119

< 18 Freshwater Drum 10/11/10

< 62

< 48

< 124

< 71

< 130

< 57

< 112

< 57

< 61

< 253

< 101 MEAN O

TABLE C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PC/KG DRY +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-21 05/20/10

< 39

< 44

< 114

< 50

< 91

< 57

< 98

< 40

< 53

< 607

< 151 10/07/10

< 46

< 43

< 109

< 52

< 105

< 60

< 87

< 39 127 +/- 51 < 387

< 81 MEAN L-40 05/20/10

< 55

< 69

< 191

< 66

< 126

< 86

< 147

< 50

< 72

< 732

< 227 10/07/10

< 39

< 52

< 110

< 52

< 122

< 58

< 97

< 46

< 58

< 402

< 92 MEAN L-41 05/20/10

< 50

< 56

< 133

< 49

< 140

< 66

< 105

< 69

< 52

< 645

< 181 10/07/10

< 45

< 50

< 124

< 55

< 113

< 60

< 88

< 44

< 48

< 365

< 119 MEAN

TABLE C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP 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 12/30/09 01/07/10 01/14/10 01/21/10 01/28/10 02/04/10 02/11/10 02/18/10 02/25/10 03/04/10 03/11/10 03/18/10 03/25/10 03/31/10 04/08/10 04/15/10 04/22/10 04/28/10 05/06/10 05/13/10 05/20/10 05/27/10 06/03/10 06/10/10 06/17/10 06/24/10 06/30/10 07/08/10 07/15/10 07/22/10 07/29/10 08/05/10 08/11/10 08/18/10 08/26/10 09/02/10 09/08/10 09/16/10 09/23/10 09/29/10 10/07/10 10/14/10 10/21/10 10/28/10 11/04/10 11/11/10 11/18/10 11/24/10 12/02/10 12/09/10 12/16/10 12/23/10 01/07/10 32 +/- 5 28 +/- 5 31 +/- 5 25 +/- 4 28 +/- 4 30 +/- 5 30 +/- 5 30 +/- 5 22 +/- 4 01/14/10 39 +/- 6 27 +/- 5 30 +/- 5 31 +/- 5 27 +/- 5 30 +/- 5 26 +/- 5 32 +/- 5 32 +/- 5 01/21/10 28 +/- 5 24 +/- 5 36 +/- 6 32 +/- 5 24 +/- 5 37 +/- 6 37 +/- 6 35 +/- 5 32 +/- 5 01/28/10 20 +/- 4 20 +/- 4 20 +/- 4 22 +/- 4 18 +/- 4 24 +/- 5 24 +/- 5 23 +/- 5 18 +/- 4 02/04/10 23 +/- 4 21 +/- 4 21 +/- 4 20 +/- 4 16 +/- 4 21 +/- 4 24 +/- 5 21 +/- 4 20 +/- 4 02/11/10 20 +/- 4 (1) 17 +/- 4 18 +/- 4 16 +/- 4 21 +/- 4 18 +/- 4 16 +/- 4 19 +/- 4 19+/-4 02/18/10 20 +/- 5 18 +/- 4 14 +/- 4 17 +/- 4 13 +/- 4 13 +/- 4 14 +/- 4 17 +/- 4 14 +/- 4 02/25/10 25 +/- 5 26 +/- 5 25 +/- 5 22 +/- 5 24 +/- 5 23 +/- 5 22 +/- 5 27 +/- 5 27 +/- 5 03/04/10 14 +/- 4 14 +/- 4 13 +/- 4 13 +/- 4 11 +/- 4 11 +/- 4 13 +/- 4 8 +/- 4 16 +/-4 03/11/10 21 +/- 4 21 +/- 4 18 +/- 4 24 +/- 5 17 +/- 4 19 +/- 4 20 +/- 4 22 +/- 5 17+/-4 03/18/10 7 +/- 4 < 6 7 +/- 4 11 +/- 4 < 6 6 +/- 4 6 +/- 4 8 +/- 4 <6 03/25/10 12 +/- 6 14 +/- 6 13 +/- 6 17 +/- 6 13 +/- 6 11 +/- 6 12 +/- 6 16 +/- 6 16 +/- 6 03/31/10 12 +/- 4 15 +/- 5 17 +/- 5 13 +/- 5 13 +/- 5 15 +/- 5 16 +/- 5 18 +/- 5 15 +/- 5 04/08/10 12 +/- 4 13 +/- 4 19 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 18 +/-4 04/15/10 18 +/- 4 18 +/- 4 22 +/- 4 18 +/- 4 17 +/- 4 17 +/- 4 23 +/- 4 18 +/- 4 17 +/- 4 04/22/10 15 +/- 4 14 +/- 4 11 +/- 4 13 +/- 4 16 +/- 4 15 +/- 4 13 +/- 4 15 +/- 4 13 +/-4 04/28/10 20+/-5 21 +/-5 18+/-5 18+/-5 18+/-5 18+/-4 19+/-5 16+/-4 19+/-5 05/06/10 15+/-5 15+/-5 19+/-5 14+/-5 18+/-5 19+/-5 20+/-5 19+/-5 18+/-5 05/13/10 9 +/- 4 9 +/- 4 9 +/- 4 10 +/- 4 8 +/- 3 9 +/- 4 8 +/- 3 11 +/- 4 8+/-4 (1) 05/20/10 13 +/- 4 10 +/- 4 11 +/- 4 8 +/- 4 9 +/- 4 7 +/- 4 9 +/- 4 10 +/- 4 8+/-4 05/27/10 12 +/- 4 10 +/- 4 20 +/- 4 13 +/- 4 9 +/- 4 14 +/- 4 12 +/- 4 15 +/- 4 11 +/-4 06/03/10 16 +/-4 19 +/-4 15+/-4 19 +/-4 13+/-4 17 +/-4 15 +/-4 16 +/-4 15 +/-6 (1) 06/10/10 15 +/- 4 13 +/- 4 11 +/- 4 12 +/- 4 15 +/- 4 14 +/- 4 15 +/- 4 15 +/- 4 17+/-11 (1) 06/17/10 10+/-4 8+/-4 8+/-4 10+/-4 9+/-4 6+/-4 7+/-4 7+/-4 <7 (1) 06/24/10 13+/-4 12+/-4 18+/-4 15+/-4 16+/-4 10+/-4 15+/-4 15+/-4 17+/-4 06/30/10 17+/-5 15+/-4 14+/-4 17+/-5 12+/-4 17+/-5 14+/-4 13+/-4 12+/-4 07/08/10 16+/-3 17+/-3 21+/-4 (1)16+/-3 20+/-4 15+/-3 17+/-3 13+/-3 15+/-3 07/15/10 21 +/-5 19+/-5 20+/-5 20+/-5 15+/-4 22+/-5 22+/-5 20+/-5 18+/-5 07/22/10 17+/-4 20+/-5 18+/-4 22+/-5 17+/-4 20+/-5 17+/-4 16+/-4 24+/-5 07/29/10 16 +/- 4 19 +/- 4 17 +/- 4 18 +/- 4 14 +/- 4 15 +/- 4 (1) 18 +/- 4 15 +/-4 18 +/- 4 08/05/10 24 +/- 5 18 +/- 4 15 +/- 4 17 +/- 4 23 +/- 5 24 +/- 5 20 +/- 5 13 +/- 4 25 +/- 5 08/11/10 22+/-5 22+/-5 25+/-5 22+/-5 17+/-5 24+/-5 24+/-5 21+/-5 18+/-5 08/18/10 24 +/- 5 26 +/- 5 21 +/- 4 22 +/- 4 23 +/- 5 19 +/- 4 21 +/- 4 20 +/- 4 20 +/- 4 08/26/10 31 +/- 5 23 +/- 4 20 +/- 4 20 +/- 4 29 +/- 5 28 +/- 5 25 +/- 4 21 +/- 4 24 +/- 4 09/02/10 21 +/-5 16+/-4 15+/-4 16+/-4 21 +/-5 19+/-5 19+/-5 15+/-4 19+/-5 09/08/10 20 +/- 4 21 +/- 4 22 +/- 4 22 +/- 4 18 +/- 4 19 +/- 4 21 +/- 4 20 +/- 4 21 +/- 4 09/16/10 18 +/- 4 20 +/- 4 22 +/- 4 20 +/- 4 19 +/- 4 20 +/- 4 18 +/- 4 20 +/- 4 21 +/- 4 09/23/10 23 +/- 5 16 +/- 4 19 +/- 4 18 +/- 4 17 +/- 4 23 +/- 5 14 +/- 4 18 +/- 4 16 +/- 4 09/29/10 24+/-5 23+/-5 19+/-5 16+/-5 19+/-5 20+/-5 19+/-5 16+/-5 15+/-5 10/07/10 19 +/- 3 17 +/- 3 17 +/- 3 19 +/- 3 17 +/- 3 21 +/- 3 19 +/- 3 17 +/- 3 21 +/- 3 10/14/10 34 +/- 5 31 +/- 5 31 +/- 5 39 +/- 6 40 +/- 6 36 +/- 5 43 +/- 6 36 +/- 6 43 +/- 6 10/21/10 19 +/- 4 24 +/- 4 27 +/- 4 24 +/- 4 27 +/- 4 31 +/- 4 29 +/- 4 27 +/- 4 26 +/- 4 10/28/10 25 +/- 4 20 +/- 4 22 +/- 4 23 +/- 4 19 +/- 4 20 +/- 4 21 +/- 4 19 +/- 4 21 +/- 4 11/04/10 14+/-3 14+/-3 15+/-3 12+/-3 15+/-3 15+/-3 15+/-3 15+/-3 15+/-3 11/11/10 17+/-4 16+/-4 16+/-4 18+/-4 19+/-4 19+/-4 17+/-4 23+/-5 17+/-4 11/18/10 37 +/- 4 32 +/- 4 36 +/- 4 33 +/- 4 35 +/- 4 39 +/- 4 34 +/- 4 34 +/- 4 37 +/- 4 11/24/10 26 +/- 5 29 +/- 5 27 +/- 5 27 +/- 5 30 +/- 5 29 +/- 5 29 +/- 5 22 +/- 5 23 +/- 5 12/02/10 26 +/- 4 24 +/- 4 31 +/- 4 24 +/- 4 26 +/- 4 28 +/- 4 33 +/- 4 27 +/- 4 26 +/- 4 12/09/10 27 +/- 5 22 +/- 4 25 +/- 5 23 +/- 5 26 +/- 5 24 +/- 5 25 +/- 5 24 +/- 5 29 +/- 5 12/16/10 23 +/- 5 28 +/- 5 24 +/- 5 25 +/- 5 22 +/- 5 30 +/- 5 30 +/- 5 25 +/- 5 28 +/- 5 12/23/10 35 +/- 4 32 +/- 4 31 +/- 4 37 +/- 4 38 +/- 4 38 +/- 4 38 +/- 4 40 +/- 4 38 +/- 4 12/29/10 13 +/- 4 12 +/- 4 10 +/- 4 11 +/- 4 14 +/- 4 11 +/- 4 15 +/- 4 9 +/- 4 14 +/-4 MEAN 20+/-14 19+/-12 20+/-14 19+/-13 19+/-14 20+/-16 20+/-16 19+/-15 20+/-14 THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-7 47 of 196

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, 2010 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 +/-

PERIOD 2SD PERIOD 2SD PERIOD 2SD PERIOD 2SD 12/30/09 01/28/10 02/25/10 03/31/10 04/28/10 06/03/10 06/30/10 07/29/10 09/02/10 09/29/10 10/28/10 12/02/10 01/28/10 02/25/10 03/31/10 04/28/10 06/03/10 06/30/10 07/29/10 09/02/10 09/29/10 10/28/10 12/02/10 12/29/10 20 39 27 +/- 12 12/30/09 17 26 21 +/- 7 01/28/10 7

21 14 +/- 9 02/25/10 12 21 16 +/- 6 03/31/10 9

19 13 +/- 6 04/28/10 8

17 13 +/- 6 06/03/10 16 21 18 +/- 4 06/30/10 16 31 23 +/- 8 07/29/10 16 24 21 +/- 6 09/02/10 17 34 24 +/- 12 09/29/10 14 37 23 +/- 16 10/28/10 12 35 24 +/- 16 12/02/10 01/28/10 02/25/10 03/31/10 04/28/10 06/03/10 06/30/10 07/29/10 09/02/10 09/29/10 10/28/10 12/02/10 12/29/10 20 36 28 +/- 11 12/30/09 14 25 19 +/- 7 01/28/10 7

24 15 +/- 9 02/25/10 11 22 17 +/- 7 03/31/10 8

20 14 +/- 8 04/28/10 8

18 13 +/- 7 06/03/10 16 22 19 +/- 4 06/30/10 15 25 19 +/- 7 07/29/10 16 22 20 +/- 4 09/02/10 17 39 25 +/- 14 09/29/10 12 36 24 +/- 16 10/28/10 10 37 23 +/- 18 12/02/10 01/28/10 18 37 28 +/- 11 12/30/09 - 01/28/10 18 32 26 +/- 14 02/25/10 13 27 19 +/- 9 01/28/10 - 02/25/10 14 27 20 +/- 10 03/31/10 6

22 13 +/- 9 02/25/10 - 03/31/10 15 17 16 +/- 2 04/28/10 13 23 17 +/- 4 03/31/10 - 04/28/10 13 19 17 +/- 6 06/03/10 7

20 13 +/- 9 04/28/10 - 06/03/10 8

18 12 +/- 8 06/30/10 6

17 12 +/- 7 06/03/10 - 06/30/10 12 17 16 +/- 6 07/29/10 13 22 17 +/- 6 06/30/10 - 07/29/10 15 24 19 +/- 8 09/02/10 13 29 21 +/- 8 07/29/10 - 09/02/10 18 25 21 +/- 6 09/29/10 14 23 19 +/- 4 09/02/10 - 09/29/10 15 21 18 +/- 7 10/28/10 17 43 26 +/- 17 09/29/10 - 10/28/10 21 43 28 +/- 21 12/02/10 15 39 25 +/- 16 10/28/10 - 12/02/10 15 37 24 +/- 18 12/29/10 9

40 26 +/- 20 12/02/10 - 12/29/10 14 38 27 +/- 20 12/30/09 - 12/29/10 7

39 20 +/- 13 12/30/09 - 12/29/10 7

39 19 +/- 13 12/30/09 - 12/29/10 6

43 20 +/- 15 12/30/09 - 12/29/10 8

43 20 +/- 14

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-01 12/30/09 - 03/31/10

< 4

< 5

< 19

< 2

< 7

< 6

< 9

< 3

< 1790

< 746 03/31/10 - 06/30/10

< 4

< 6

< 14

< 3

< 6

< 12

< 3

< 649

< 295 06/30/10 - 09/29/10

< 4

< 6

< 22

< 3

< 10

< 6

< 12

< 4

< 3

< 951

< 469 09/29/10 - 12/29/10

< 3

< 4

< 11

< 2

< 8

< 5

< 7

< 3

< 2

< 317

< 165 MEAN L-03 12/30/09 - 03/31/10

< 4

< 7

< 29

< 3

< 11

< 7

< 14

< 3

< 2

< 1910

< 979 03/31/10 - 06/30/10

< 3

< 6

< 23

< 2

< 7

< 6

< 11

< 3

< 599

< 334 06/30/10 - 09/29/10

< 2

< 5

< 11

< 2

< 4

< 5

< 8

< 2

< 467

< 229 09/29/10 - 12/29/10

< 4

< 18

< 2

< 10

< 5

< 10

< 3

< 481

< 184 MEAN L-04 12/30/09 - 03/31/10

< 4

< 5

< 30

< 3

< 9

< 5

< 12

< 4

< 3

< 2350

< 1050 03/31/10 - 06/30/10

< 5

< 8

< 23

< 5

< 12

< 11

< 17

< 4

< 3

< 1170

< 328 06/30/10 - 09/29/10

< 3

< 5

< 19

< 3

< 7

< 6

< 11

< 3

< 866

< 309 09/29/10 - 12/29/10

< 3

< 6

< 21

< 4

< 8

< 6

< 13

< 4

< 3

< 535

< 162 MEAN L-05 12/30/09 - 03/31/10

< 3

< 7

< 19

< 3

< 5

< 4

< 9

< 3

< 1470

< 419 03/31/10 - 06/30/10

< 4

< 8

< 14

< 3

< 12

< 6

< 9

< 5

< 3

< 894

< 271 06/30/10 - 09/29/10

< 3

< 4

< 14

< 3

< 6

< 9

< 2

< 804

< 269 09/29/10 - 12/29/10

< 3

< 6

< 17

< 3

< 9

< 7

< 9

< 4

< 3

< 482

< 210 MEAN

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-06 12/30/09 - 03/31/10

< 4

< 7

< 22

< 2

< 5

< 8

< 15

< 3

< 2120

< 896 03/31/10 - 06/30/10

< 2

< 7

< 14

< 4

< 9

< 6

< 12

< 3

< 893

< 237 06/30/10 - 09/29/10

< 4

< 6

< 19

< 3

< 8

< 13

< 3

< 1090

< 339 09/29/10 - 12/29/10

< 3

< 9

< 2

< 6

< 5

< 8

< 2

< 353

< 134 MEAN L-07 12/30/09 03/31/10

< 3

< 7

< 21

< 2

< 10

< 9

< 15

< 4

< 3

< 2350

< 997 03/31/10 - 06/30/10

< 4

< 7

< 25

< 3

< 12

< 11

< 19

< 4

< 1160

< 568 06/30/10 - 09/29/10

< 3

< 6

< 17

< 3

< 8

< 5

< 10

< 2

< 659

< 195 09/29/10 - 12/29/10

< 3

< 4

< 10

< 2

< 7

< 5

< 3

< 2

< 330

< 131 MEAN L-08 12/30/09 - 03/31/10

< 3

< 5

< 22

< 3

< 8

< 7

< 11

< 3

< 1740

< 521 03/31/10 - 06/30/10

< 4

< 8

< 20

< 4

< 12

< 8

< 15

< 4

< 3

< 946

< 355 06/30/10 - 09/29/10

< 2

< 3

< 16

< 3

< 6

< 5

< 6

< 2

< 624

< 238 09/29/10 - 12/29/10

< 3

< 5

< 17

< 4

< 8

< 6

< 11

< 4

< 3

< 477

< 163 MEAN L-10 12/30/09 - 03/31/10

< 3

< 8

< 27

< 2

< 8

< 11

< 4

< 3

< 2310

< 702 03/31/10 - 06/30/10

<3

< 5

< 10

< 2

<9

< 6

< 11

<3

<2

< 1020

< 166 06/30/10 - 09/29/10

< 4

< 6

< 20

< 3

< 7

< 15

< 3

< 741

< 362 09/29/10 - 12/29/10

< 3

< 5

< 16

< 4

< 8

< 5

< 12

< 3

< 395

< 220 MEAN

TABLE C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-11 12/30/09-03/31/10

<5

<7

<24

<2

<7

< 10

< 18

<3

< 1280

<761 03/31/10 -06/30/10

<5

<7

<29

<3

< 13

< 10

< 16

<4

< 1140

< 342 06/30/10 - 09/29/10

< 3

< 5

< 16

< 4

< 8

< 6

< 9

< 3

< 2

< 748

< 180 09/29/10 - 12/29/10

< 2

< 5

< 13

< 3

< 6

< 8

< 3

< 2

< 375

< 95 MEAN

TABLE C-VI.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP 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 12/30/09 - 01/07/10

< 58

< 57

< 50

< 57

< 51

< 22

< 51 01/07/10 - 01/14/10

< 51

< 52

< 51

< 50

< 51

< 52

< 28

< 51

< 51 01/14/10 - 01/21/10

< 19

< 8

< 19

< 17

< 17 01/21/10 - 01/28/10

< 41

< 31

< 41

< 56

< 55 01/28/10 - 02/04/10

< 38

< 51

< 46

< 46 02/04/10 - 02/11/10

< 19 (1) < 19

< 10

< 19

< 20

< 20 02/11/10 - 02/18/10

< 49

< 46

< 49

< 21

< 43

< 42

< 40

< 42 02/18/10 - 02/25/10

< 21

< 9

< 21

< 39

< 38

< 38 02/25/10 - 03/04/10

< 39

< 21

< 39

< 42

< 42 03/04/10 - 03/11/10

< 13

< 7

< 13

< 16

< 17

< 16 03/11/10 - 03/18/10

< 41

< 40

< 30

< 40

< 53

< 53 03/18/10 - 03/25/10

< 45

< 28

< 45

< 41

< 40

< 39

< 40 03/25/10 - 03/31/10

< 59

< 42

< 59

< 24

< 44

< 44 03/31/10 -04/08/10

< 11

< 12

<6

< 11

< 14

< 14 04/08/10 - 04/15/10

<12

<17

<12

<17

<7

<17

<17 04/15/10 - 04/22/10

< 13

< 7

< 13

< 18

< 18 04/22/10 - 04/28/10

< 36

< 28

< 36

< 29

< 29 04/28/10 - 05/06/10

< 40

< 41

< 17

< 40

< 44

< 44 05/06/10 - 05/13/10

< 12

< 18

< 12

< 17

< 8

< 19 (1) 05/13/10 - 05/20/10

< 41

< 45

< 22

< 40

< 54

< 53

< 52

< 52 05/20/10 - 05/27/10

< 24

< 23

< 14

< 24

< 31

< 30

< 30 05/27/10 - 06/03/10

< 51

< 22

< 51

< 41

< 42

< 63 (1) 06/03/10 - 06/10/10

< 35

< 63

< 56

< 55

< 163 (1) 06/10/10 - 06/17/10

< 16

< 9

< 16

< 19

< 20

< 23 (1) 06/17/10 - 06/24/10

< 68

< 37

< 59

< 61

< 61 06/24/10 - 06/30/10

< 23

< 13

< 23

< 26

< 26 06/30/10 - 07/08/10

< 43

< 18

< 55 (1) < 43

< 43

< 42

< 41

< 41 07/08/10 - 07/15/10

< 59

< 25

< 59

< 50

< 51

< 51 07/15/10 - 07/22/10

< 25

< 14

< 24

< 25

< 24

< 32

< 31

< 31 07/22/10 - 07/29/10

< 42

< 23

< 41

< 63 (1)

< 58

< 58 07/29/10 - 08/05/10

< 24

< 35

< 24

< 15

< 36

< 36 08/05/10 - 08/11/10

< 22

< 10

< 22

< 27

< 27 08/11/10 - 08/18/10

< 20

< 21

< 14

< 20

< 15

< 8

< 14

< 14 08/18/10 - 08/26/10

< 34

< 19

< 34

< 42

< 41

< 18

< 42 08/26/10 - 09/02/10

< 34

< 28

< 34

< 28

< 16 09/02/10 - 09/08/10

< 59

< 32

< 59

< 49

< 49 09/08/10 - 09/16/10

< 62

< 66

< 62

< 66

< 36

< 66 09/16/10 - 09/23/10

< 42

< 23

< 41

< 53

< 52

< 52 09/23/10 - 09/29/10

< 66

< 64

< 36

< 65

< 70

< 70 09/29/10 - 10/07/10

< 44

< 23

< 44

< 43

< 58

< 58 10/07/10 - 10/14/10

< 25

< 46

< 64

< 66

< 65

< 65 10/14/10 - 10/21/10

< 43

< 45

< 44

< 53

< 44

< 53

< 23

< 53 10/21/10 - 10/28/10

< 55

< 30

< 60

< 60 10/28/10 - 11/04/10

< 22

< 18

< 22

< 18

< 10

< 18 11/04/10 - 11/11/10

< 46

< 29

< 46

< 47

< 47 11/11/10 - 11/18/10

< 57

< 56

< 57

< 56

< 58

< 32

< 58 11/18/10 - 11/24/10

< 46

< 25

< 45

< 53

< 53 11/24/10 - 12/02/10

< 46

< 52

< 46

< 51

< 53

< 29

< 53 12/02/10 - 12/09/10

< 66

< 68

< 67

< 42

< 68

< 67

< 68 12/09/10 - 12/16/10

<13

<7

<13

<17

<18

<18 12/16/10 - 12/23/10

< 60

< 65

< 60

< 66

< 36

< 66

< 66 12/23/10 - 12/29/10

< 54

< 30

< 54

< 64

< 70

< 70 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-12 52 of 196

TABLE C-VII.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM COLLECTION L-42 PERIOD 01/08/10

< 0.2 02/04/10

< 0.6 03/04/10

< 0.7 04/01/10

< 0.5 05/06/10

< 0.9 05/20/10

< 0.6 06/04/10

< 0.5 06/17/10

< 0.9 07/03/10

< 0.7 07/15/10

< 0.6 07/29/10

< 0.6 08/11/10

< 0.9 08/26/10

< 0.9 09/09/10

< 0.7 09/23/10

< 0.6 10/07/10

< 0.7 10/21/10

< 1.0 11/04/10

< 0.8 12/02/10

< 0.4 MEAN C-13 53 of 196

cs O

TABLE C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-42 01/08/10

<8

<16

<9

<18

<11

<13

<7

<30

<12 02/04/10

<5

<6

<11

<6

<14

<6

<11

<5

<23

<7 03/04/10

<4

<10

<5

<9

<5

<8

<4

<5

<21

<6 04/01/10

<7

<16

<6

<13

<8

<12

<7

<36

<9 05/06/10

<8

<13

<9

<15

<8

<16

<7

<9

<47

<15 05/20/10

<2

<6

<2

<4

<2

<4

<2

<32

<8 06/04/10

<6

<8

<21

<9

<18

<8

<11

<6

<8

<40

<14 06/17/10

<5

<11

<4

<10

<6

<11

<5

<6

<38

<10 07/03/10

<5

<13

<5

<11

<6

<9

<5

<25

<7 07/15/10

<8

<7

<16

<6

<15

<7

<12

<7

<8

<31

<8 07/29/10

<5

<6

<12

<5

<11

<6

<10

<5

<48

<14 08/11/10

<6

<15

<6

<14

<6

<9

<6

<39

<7 08/26/10

<5

<12

<5

<13

<6

<9

<4

<5

<46

<13 09/09/10

<6

<7

<17

<7

<13

<7

<12

<6

<53

<14 09/23/10

<5

<13

<7

<12

<5

<10

<5

<6

<24

<8 10/07/10

<6

<12

<7

<14

<7

<10

<5

<6

<30

<10 10/21/10

<5

<4

<10

<6

<11

<4

<8

<4

<5

<23

<7 11/04/10

<6

<7

<17

<9

<16

<7

<12

<5

<6

<39

<14 12/02/10

<7

<17

<9

<16

<8

<12

<6

<44

<13 MEAN

TABLE C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA STC COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD L-CONTROL Beets 09/06/10

<7

<19

<7

<15

<8

<14

<40

< 6

<7

<63

<18 Cabbage 09/06/10

< 9

< 10

< 24

< 10

< 20

< 11

< 19

< 58

< 8

< 9

< 98

< 22 MEAN L-QUAD 1 Broccoli 09/06/10

< 9

< 10

< 26

< 12

< 24

< 10

< 19

< 56

< 7

< 9

< 102

< 23 Potatoes 09/06/10

< 24

< 33

< 74

< 26

< 54

< 35

< 48

< 59

< 19

< 25

< 502

< 121 MEAN L-QUAD 2 Broccoli 09/06/10

< 9

< 10

< 26

< 10

< 22

< 10

< 20

< 56

< 9

< 10

< 92

< 30 Onions 09/06/10

< 8

< 10

< 23

< 10

< 19

< 9

< 18

< 53

< 8

< 9

< 85

< 23 MEAN L-QUAD 3 Beets 09/06/10

< 6

< 16

< 7

< 12

< 7

< 13

< 38

< 5

< 7

< 63

< 17 Cabbage 09/06/10

< 8

< 9

< 25

< 10

< 17

< 10

< 18

< 60

< 8

< 10

< 91

< 19 MEAN L-QUAD 4 Beets 09/06/10

< 17

< 20

< 57

< 21

< 39

< 24

< 41

< 54

< 13

< 21

< 372

< 114 Cabbage 09/06/10

< 8

< 9

< 23

< 11

< 21

< 10

< 16

< 49

< 7

< 8

< 88

< 25 MEAN

TABLE C -IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2010 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 27.5 +/- 10.5 31 23 23 33 L-01-2 29.3 +/- 11.7 32 23 26 36 L-03-1 28.0 +/- 10.5 33 24 23 32 L-03-2 26.5 +/- 10.4 33 21 24 28 L-04-1 25.3 +/- 11.0 30 20 21 30 L-04-2 25.5 +/- 12.9 30 19 21 32 L-05-1 26.3 +/- 12.5 30 20 22 33 L-05-2 27.8 +/- 12.8 33 20 25 33 L-06-1 28.8 +/- 10.1 33 23 26 33 L-06-2 26.5 +/- 10.6 30 21 23 32 L-07-1 27.3 +/- 10.8 29 22 24 34 L-07-2 27.3 +/- 13.4 32 22 21 34 L-08-1 26.0 +/- 13.0 31 19 22 32 L-08-2 28.3 +/- 11.0 33 23 24 33 L-10-1 25.3 +/- 11.7 28 19 22 32 L-10-2 24.3 +/- 11.1 28 19 20 30 L-11-1 23.5 +/- 11.6 28 18 19 29 L-11-2 25.0 +/- 15.1 31 18 19 32 L-101-1 29.8 +/- 14.0 33 23 25 38 L-101-2 27.5 +/- 14.5 31 21 22 36 L-102-1 30.8 +/- 11.4 34 25 27 37 L-102-2 31.0 +/- 12.1 32 25 28 39 L-103-1 27.8 +/- 16.2 32 20 22 37 L-103-2 28.8 +/- 9.1 31 24 26 34 L-104-1 29.3 +/- 14.0 36 21 26 34 L-104-2 29.3 +/- 16.9 35 22 22 38 L-105-1 31.5 +/- 12.9 33 26 27 40 L-105-2 28.8 +/- 11.0 34 24 24 33 L-106-1 27.5 +/- 13.2 31 21 23 35 L-106-2 28.5 +/- 13.7 31 24 22 37 L-107-1 30.3 +/- 15.0 38 26 22 35 L-107-2 27.8 +/- 13.3 33 22 22 34 L-108-1 28.8 +/- 15.4 32 21 24 38 L-108-2 25.3 +/- 13.7 29 20 19 33 L-109-1 29.3 +/- 15.9 32 21 25 39 L-109-2 29.3 +/- 12.9 32 23 25 37 L-110-1 30.5 +/- 13.1 38 25 25 34 L-110-2 30.5 +/- 15.0 33 25 24 40 L-112-1 28.3 +/- 12.9 31 24 22 36 L-112-2 30.5 +/- 14.0 33 27 23 39 L-114-1 31.5 +/- 15.2 37 24 26 39 L-114-2 29.0 +/- 9.2 33 25 25 33 L-115-1 27.3 +/- 12.2 33 22 22 32 L-115-2 26.8 +/- 11.1 31 23 21 32 L-116-1 25.8 +/- 11.1 30 20 22 31 L-116-2 26.0 +/- 12.8 32 20 21 31 L-201-3 26.0 +/- 10.7 30 20 23 31 L-201-4 28.5 +/- 12.3 33 21 26 34 L-202-3 27.3 +/- 14.2 30 22 21 36 C-16 56 of 196

TABLE C-IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2010 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-202-4 27.0 +/- 14.2 31 21 21 35 L-203-1 28.5 +/- 15.0 35 22 22 35 L-203-2 29.5 +/- 10.6 33 24 26 35 L-204-1 30.5 +/- 11.0 33 25 27 37 L-204-2 30.0 +/- 10.7 35 24 27 34 L-205-1 30.3 +/- 15.0 32 23 26 40 L-205-2 29.5 +/- 12.8 34 24 24 36 L-205-3 28.0 +/- 14.0 34 21 23 34 L-205-4 29.8 +/- 12.5 31 24 26 38 L-206-1 29.3 +/- 13.7 33 23 24 37 L-206-2 28.3 +/- 12.5 32 24 22 35 L-207-1 28.8 +/- 10.1 33 23 26 33 L-207-2 29.0 +/- 11.2 31 24 25 36 L-208-1 29.5 +/- 10.4 34 25 25 34 L-208-2 28.0 +/- 6.7 29 24 27 32 L-209-1 29.0 +/- 11.2 31 24 25 36 L-209-2 28.0 +/- 10.7 32 22 25 33 L-210-1 31.5 +/- 13.2 35 25 27 39 L-210-2 31.3 +/- 12.3 33 25 28 39 L-211-1 29.0 +/- 11.2 31 25 24 36 L-211-2 29.3 +/- 13.2 32 22 26 37 L-212-1 29.5 +/- 8.9 31 25 27 35 L-212-2 28.3 +/- 10.0 32 23 25 33 L-213-3 27.0 +/- 14.2 31 21 21 35 L-213-4 26.8 +/- 10.0 30 23 22 32 L-214-3 29.3 +/- 15.4 38 21 25 33 L-214-4 28.3 +/- 9.8 32 24 24 33 L-215-3 28.3 +/- 9.8 32 24 24 33 L-215-4 28.8 +/- 10.0 32 24 25 34 L-216-3 30.3 +/- 11.5 33 25 26 37 L-216-4 29.8 +/- 13.4 35 23 25 36 L-111 B-1 28.5 +/- 10.5 32 24 24 34 L-111 B-2 30.0 +/- 9.9 33 28 24 35 L-113A-1 30.0 +/- 12.4 33 27 23 37 L-113A-2 30.8 +/- 12.5 31 29 24 39 C-17 57 of 196

TABLE C-IX.2 MEAN QUARTERLY TLD RESULTS FOR THE INNER RING, OUTER RING, OTHER AND CONTROL LOCATIONS FOR LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER +/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTION INNER RING OUTER RING OTHER CONTROL PERIOD

+/- 2 S.D.

JAN-MAR 32.8 +/- 4.2 32.4 +/- 3.7 31.2 +/- 3.2 28.0 +/- 0.0 APR-JUN 23.5 +/- 4.9 23.2 +/- 2.9 21.0 +/- 3.9 19.0 +/- 0.0 JUL-SEP 23.7 +/- 4.1 24.7 +/- 3.8 22.7 +/- 4.3 21.0 +/- 2.8 OCT-DEC 35.8 +/- 5.4 35.1 +/- 4.3 32.3 +/- 3.9 31.0 +/- 2.8 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATION SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM

+/- 2 S.D.

INNER RING 128 19 40 28.9 +/- 11.9 OUTER RING 136 20 40 28.9 +/- 10.7 OTHER 64 18 36 26.8 +/- 10.7 CONTROL 8

19 32 24.8 +/- 10.6 INNER RING STATIONS - L-101-1, L-101-2, L-102-1, L-102-2, L-103-1, L-103-2, L-104-1, L-104-2, L-105-1, L-105-2, L-106-1, L-106-2, L-107-1, L-107-2, L-108-1, L-108-2, L-109-1, L-109-2, L-110-1, L-110-2, L-111 B-1, L-111 B-2, L-112-1, L-112-2, L-113A-1, L-113A-2, L-114-1, L-114-2, L-115-1, L-115-2, L-116-1, L-116-2 OUTER RING STATIONS - L-201-3, L-201-4, L-202-3, L-202-4, L-203-1, L-203-2, L-204-1, L-204-2, L-205-1, L-205-2, L-205-3, L-205-4, L-206-1, L-206-2, L-207-1, L-207-2, L-208-1, L-208-2, L-209-1, L-209-2, L-210-1, L-210-2, L-211-1, L-211-2, L-212-1, L-212-2, L-213-3, L-213-4, L-214-3, L-214-4, L-215-3, L-215-4, L-216-3, L-216-4 OTHER STATIONS - L-01-1, L-01-2, L-03-1, L-03-2, L-04-1, L-04-2, L-05-1, L-05-2, L-06-1, L-06-2, L-07-1, L-07-2, L-08-1, L-08-2, L-11-1, L-11-2 CONTROL STATIONS - L-10-1, L-10-2 C-18 58 of 196

FIGURE C-1 Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2000 - 2004 L-21 (C) Illinois River at Seneca 2,J oo O'i--O i *00 T 2 M-L-40 Illinois River Downstream J

ML C-19 59 of 196

FIGURE C-1 (cont.)

Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2010 L-21 (C) Illinois River at Seneca L-40 Illinois River Downstream 01-27-05 04-05-06 06-12-07 08-18-08 10-25-09 01-01-11 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-20 60 of 196

FIGURE C-2 Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2000 - 2004 L-21 (C) Illinois River at Seneca 03 12-31-CJL?

12-1-D1 12-31-02 12.:31 Illinois River Downstream 1 61.0 01.01.03 141-31 43 2-311-01 12-31-012-31-03 112-M-04 C-21 61 of 196

FIGURE C-2 (cont.)

Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2010 L-21 Illinois River at Seneca 0;

1 1

1 I

03-31-05 05-25-06 07-19-07 09-11-08 11-05-09 12-30-10 L-40 Illinois River Downstream 0

4 03-31-05 05-25-06 07-19-07 09-11-08 11-05-09 12-30-10 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-22 62 of 196

FIGURE C-3 Air Particulate - Gross Beta - Stations L -01 and L-03 Collected in the Vicinity of LSCS, 2000 - 2004 L-01 Nearsite No. I 1 a:c -;

8.0 L-03 Onsite No 3 o.o tat a31-11-31-00 12*31.y+1

2931-42 12-31-D3 12-30-J4 C-23 63 of 196

FIGURE C-3 (cont.)

Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2005 - 2010 L-01 Nearsite No. 1 50.0 -r 0.0 i I

I I

I 01-06-05 03-19-06 05-30-07 08-09-08 10-20-09 12-31-10 L-03 Onsite No. 3 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-24 64 of 196

FIGURE C-4 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2000 - 2004 L-06 Ons to Noy 5

-2.0 12-31-0 12-31-21 12-31.02 12-31.01 12-34-04 L-06 Ne rsite No 6 1 G[1 12 1 t 12-31-01 1 Z=a1 AN 12-YJ-C4 C-25 65 of 196

FIGURE C-4 (cont.)

Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2005 - 2010 L-05 Onsite No. 5 L-06 Nearsite No. 6

+

-4 01-06-05 03-19-06 05-30-07 12-31-10 08-09-08 10-20-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-26 66 of 196

FIGU RE C-5 Air Particulate - Gross Beta - Station L-10 (C)

Collected in the Vicinity of LSCS, 2000 - 2004 L-1 (C) Streator 8.Q C-27 67 of 196

FIGURE C-5 (cont.)

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

Collected in the Vicinity of LSCS, 2005 - 2010 L-10 (C) Streator DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-28 68 of 196

FIGURE C-6 Air Particulate - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LSCS, 2005 - 2010 L-04 Rte. 170 1

0.0 i

'I I

I 1

I 07-07-05 08-11-06 09-15-07 10-19-08 11-23-09 12-28-10 L-07 Seneca 50.0 T 0.0 1 1

F I

I I

07-07-05 08-11-06 09-15-07 10-19-08 11-23-09 12-28-10 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-29 69 of 196

FIGURE C-7 Air Particulate - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LSCS, 2005 - 2010 L-08 Marseilles 50.0 r 40.0 30.0 20.0 10.0 1

1 0.0 07-07-05 08-11-06 09-15-07 10-19-08 11-23-09 12-28-10 L-11 Ransom 0.0

+

07-07-05 08-11-06 09-15-07 10-19-08 11-23-09 12-28-10 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-30 70 of 196

APPENDIX INTER-LABORATORY COMPARISON PROGRAM 71 of 196

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a)

Value (b)

TBE/Analytics Evaluation (d)

March 2010 E6978-396 Milk Sr-89 pCi/L 89.3 92.8 0.96 A

Sr-90 pCi/L 13.8 12.7 1.09 A

E6979-396 Milk 1-131 pCi/L 65.2 74.0 0.88 A

Ce-141 pCi/L 241 261 0.92 A

Cr-51 pCi/L 388 361 1.07 A

Cs-134 pCi/L 157 178 0.88 A

Cs-137 pCi/L 150 158 0.95 A

Co-58 pCi/L 143 143 1.00 A

Mn-54 pCi/L 202 207 0.98 A

Fe-59 pCi/L 146 137 1.07 A

Zn-65 pCi/L 247 254 0.97 A

Co-60 pCi/L 177 183 0.97 A

E6981-396 AP Ce-141 pCi 211 185 1.14 A

Cr-51 pCi 304 255 1.19 A

Cs-134 pCi 142 125 1.14 A

Cs-137 pCi 131 111 1.18 A

Co-58 pCi 119 101 1.18 A

Mn-54 pCi 162 146 1.11 A

Fe-59 pCi 110 97 1.14 A

Zn-65 pCi 217 179 1.21 W

Co-60 pCi 145 129 1.12 A

E6980-396 Charcoal 1-131 pCi 80.2 85.6 0.94 A

June 2010 E7132-396 Milk Sr-89 pCi/L 82.0 93.4 0.88 A

Sr-90 pCi/L 15.8 16.7 0.95 A

E7133-396 Milk 1-131 pCi/L 83.5 96.9 0.86 A

Ce-141 pCi/L 107 110 0.97 A

Cr-51 pCi/L 325 339 0.96 A

Cs-134 pCi/L 114 126 0.90 A

Cs-137 pCi/L 144 150 0.96 A

Co-58 pCi/L 92.3 101 0.91 A

Mn-54 pCi/L 165 169 0.98 A

Fe-59 pCi/L 121 119 1.02 A

Zn-65 pCi/L 197 206 0.96 A

Co-60 pCi/L 190 197 0.96 A

E7135-396 AP Ce-141 pCi 88.4 91.6 0.97 A

Cr-51 pCi 292 282 1.04 A

Cs-134 pCi 101 105 0.96 A

Cs-137 pCi 132 125 1.06 A

Co-58 pCi 87.3 84.0 1.04 A

Mn-54 pCi 150 140 1.07 A

Fe-59 pCi 105 98.6 1.06 A

Zn-65 pCi 168 171 0.98 A

Co-60 pCi 170 163 1.04 A

E7134-396 Charcoal 1-131 pCi 76.4 79.9 0.96 A

D-1 72 of 196

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 2 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a)

Value (b)

TBE/Analytics Evaluation (d)

September 2010 E7229-396 Milk Sr-89 pCi/L 85.0 92.8 0.92 A

Sr-90 pCi/L 12.6 14.7 0.86 A

E7230-396 Milk 1-131 pCi/L 80.2 94.1 0.85 A

Ce-141 pCi/L 130 130 1.00 A

Cr-51 pCi/L 235 234 1.00 A

Cs-134 pCi/L 83.2 93.0 0.89 A

Cs-137 pCi/L 95.1 94.5 1.01 A

Co-58 pCi/L 77.3 73.7 1.05 A

Mn-54 pCi/L 121 119 1.02 A

Fe-59 pCi/L 96.4 91.1 1.06 A

Zn-65 pCi/L 216 204 1.06 A

Co-60 pCi/L 172 171 1.01 A

E7232-396 AP Ce-141 pCi 122 119 1.03 A

Cr-51 pCi 228 214 1.07 A

Cs-134 pCi 79.9 85.3 0.94 A

Cs-137 pCi 93.8 86.7 1.08 A

Co-58 pCi 71.5 67.6 1.06 A

Mn-54 pCi 113 110 1.03 A

Fe-59 pCi 73.8 83.6 0.88 A

Zn-65 pCi 186 187 0.99 A

Co-60 pCi 163 157 1.04 A

E7231-396 Charcoal 1-131 pCi/L 62.3 59.9 1.04 A

December 2010 E7375-396 Milk Sr-89 pCi/L 92.7 98.0 0.95 A

Sr-90 pCi/L 13.5 13.5 1.00 A

E7376-396 Milk 1-131 pCi/L 87.9 96.9 0.91 A

Ce-141 pCi/L not provided by Analytics for this study Cr-51 pCi/L 389 456 0.85 A

Cs-134 pCi/L 137 157 0.87 A

Cs-137 pCi/L 172 186 0.92 A

Co-58 pCi/L 84.3 90.2 0.93 A

Mn-54 pCi/L 120 120 1.00 A

Fe-59 pCi/L 134 131 1.02 A

Zn-65 pCi/L 162 174 0.93 A

Co-60 pCi/L 284 301 0.94 A

E7378-396 AP Ce-141 pCi not provided by Analytics for this study Cr-51 pCi 387 365 1.06 A

Cs-134 pCi 135 126 1.07 A

Cs-137 pCi 157 149 1.05 A

Co-58 pCi 73.6 72.3 1.02 A

Mn-54 pCi 88.7 96 0.92 A

Fe-59 pCi 127 105 1.21 W

Zn-65 pCi 151 139 1.09 A

Co-60 pCi 249 241 1.03 A

D-2 73 of 196

TABLE D -1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 3 OF 3)

Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a)

Value (b)

TBE/Analytics Evaluation (d)

December 2010 E7377-396 Charcoal 1-131 pCi 79.6 84.2 0.95 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 74 of 196

TABLE D-2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 1)

Identification Reported Known Month/Year Number Media Nuclide Units Value (a)

Value (b)

Control Limits Evaluation (c)

May 2010 RAD-81 Water Sr-89 pCi/L 64.4 60.4 48.6-68.2 A

Sr-90 pCi/L 37.8 41.3 30.4-47.4 A

Ba-133 pCi/L 66.4 65.9 54.9-72.5 A

Cs-134 pCi/L 66.43 71.6 58.4-78.8 A

Cs-137 pCi/L 137.33 146 131-163 A

Co-60 pCi/L 83.33 84.5 76.0-95.3 A

Zn-65 pCi/L 177 186 167 - 219 A

Gr-A pCi/L 26.37 32.9 16.9-42.6 A

Gr-B pCi/L 28.77 37.5 24.7-45.0 A

1-131 pCi/L 26.27 26.4 21.9-31.1 A

H-3 pCi/L 12967 12400 10800 - 13600 A

November 2010 RAD-83 Water Sr-89 pCi/L 77.8 68.5 55.8-76.7 N (1)

Sr-90 pCi/L 39.3 43.0 31.7-49.3 A

Ba-133 pCi/L 70.3 68.9 57.5-75.8 A

Cs-134 pCi/L 39.9 43.2 34.5-47.5 A

Cs-137 pCi/L 117 123 111-138 A

Co-60 pCi/L 53.5 53.4 48.1-61.3 A

Zn-65 pCi/L 11.0 102 91.8 - 122 N (2)

Gr-A pCi/L 35.1 42.3 21.9-53.7 A

Gr-B pCi/L 35.5 36.6 24.0-44.2 A

1-131 pCi/L 27.9 27.5 22.9-32.3 A

H-3 pCi/L 13233 12900 11200 - 14200 A

(1) Sr-89 TBE to known ratio of 1.14 fell within acceptable range of +/- 20%. No action required. NCR 10-09 (2) Zn-65 result of 111 was incorrectly reported as 11.0. No action required. NCR 10-09 (a) Teledyne Brown Engineering reported result.

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

(c) ERA evaluation: A=acceptable. Reported result falls within the Warning Limits. NA=not acceptable.

Reported result falls outside of the Control Limits.

CE=check for Error. Reported result falls within the Control Limits and outside of the Warning Limit.

D-4 75 of 196

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

TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 2)

Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a)

Value (b)

Range Evaluation (c)

March 2010 10-MaW22 Water Cs-134 Bq/L

-0.0942 (1)

A Cs-137 Bq/L 58.5 60.6 42.4-78.8 A

Co-57 Bq/L 27.2 28.3 19.8-36.8 A

Co-60 Bq/L 0.0226 (1)

A H-3 Bq/L 104 90.8 63.6-118.0 A

Mn-54 Bq/L 26.6 26.9 18.8-35.0 A

Sr-90 Bq/L 0.1029 (1)

A Zn-65 Bq/L 42.0 40.7 28.5-52.9 A

10-GrW22 Water Gr-A Bq/L 0.5173 0.676 0.00-1.352 A

Gr-B Bq/L 3.98 3.09 1.55-4.64 A

10-MaS22 Soil Cs-134 Bq/kg 665 733 513 - 953 A

Cs-137 Bq/kg 800 779 545 - 1013 A

Co-57 Bq/kg 508 522 365 - 679 A

Co-60 Bq/kg 648 622 435 - 809 A

Mn-54 Bq/kg 893 849 594 - 1104 A

K-40 Bq/kg 597 559 391 - 727 A

Sr-90 Bq/kg 221 288 202 - 374 W

Zn-65 Bq/kg

-4.97 (1)

A 10-RdF22 AP Cs-134 Bq/sample 1.81 2.13 1.49-2.77 A

Cs-137 Bq/sample 1.70 1.53 1.07-1.99 A

Co-57 Bq/sample 0.0056 (1)

A Co-60 Bq/sample 2.65 2.473 1.731 - 3.215 A

Mn-54 Bq/sample 3.70 3.02 2.11-3.93 W

Sr-90 Bq/sample 0.0523 (1)

A Zn-65 Bq/sample -0.0627 (1)

A 10-GrF22 AP Gr-A Bq/sample 0.1533 0.0427 0.00-0.854 A

Gr-B Bq/sample 1.240 1.29 0.65-1.94 A

10-RdV22 Vegetation Cs-134 Bq/sample 4.48 4.39 3.07-5.71 A

Cs-137 Bq/sample 3.43 3.06 2.14-3.98 A

Co-57 Bq/sample -0.0117 (1)

A Co-60 Bq/sample 3.55 3.27 2.29-4.25 A

Mn-54 Bq/sample 0.007 (1)

A Sr-90 Bq/sample -0.0002 (1)

A Zn-65 Bq/sample 8.12 7.10 4.97-9.23 A

September 2010 10-MaW23 Water Cs-134 Bq/L 27.1 31.4 22.0-40.8 A

Cs-137 Bq/L 41.8 44.2 30.9-57.5 A

Co-57 Bq/L 33.2 36.0 25.2-46.8 A

Co-60 Bq/L 26.5 28.3 19.8-36.8 A

H-3 Bq/L 500 453.4 317.4 - 589.4 A

Mn-54 Bq/L 0.024 (1)

A Sr-90 Bq/L 8.10 8.3 5.8-10.8 A

Zn-65 Bq/L 30.8 31.0 21.7-40.3 A

10-GrW23 Water Gr-A Bq/L 2.36 1.92 0.58-3.26 A

Gr-B Bq/L 6.37 4.39 2.20-6.59 A

D-5 76 of 196

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

TELEDYNE BROWN ENGINEERING, 2010 (PAGE 2 OF 2)

Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a)

Value (b)

Range Evaluation (c)

Cs-134 Bq/kg 837 940 658 - 1222 A

Cs-137 Bq/kg 680 670 469 - 871 A

Co-57 Bq/kg 2.78 (1)

A Co-60 Bq/kg 350 343 240 - 446 A

Mn-54 Bq/kg 853 820 574 - 1066 A

K-40 Bq/kg 721 699 489 - 909 A

Sr-90 Bq/kg 2.24 (1)

A Zn-65 Bq/kg 287 265 186 - 345 A

Cs-134 Bq/sample 2.31 2.98 2.09-3.87 W

Cs-137 Bq/sample -0.025 (1)

A Co-57 Bq/sample 3.64 4.08 2.86-5.380 A

Co-60 Bq/sample 2.81 2.92 2.04-3.80 A

Mn-54 Bq/sample 3.19 3.18 2.23-4.13 A

Sr-90 Bq/sample 1.01 1.01 0.71-1.31 A

Zn-65 Bq/sample 0.0310 (1)

A Gr-A Bq/sample 0.004 (1)

A Gr-B Bq/sample 0.473 0.50 0.25-0.75 A

Cs-134 Bq/sample 4.90 4.79 3.35-6.23 A

Cs-137 Bq/sample 6.78 5.88 4.12-7.64 A

Co-57 Bq/sample 10.2 8.27 5.79-10.75 W

Co-60 Bq/sample 0.00 (1)

A Mn-54 Bq/sample 7.36 6.287 4.401 - 8.173 A

Sr-90 Bq/sample 2.53 2.63 1.84-3.42 A

Zn-65 Bq/sample 6.40 5.3900 3.77-7.01 A

September 2010 1 0-MaS23 Soil 10-RdF23 AP 10-GrF23 AP 10-RdV23 Vegetation (1) False positive test.

(a) Teledyne Brown Engineering reported result.

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

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

D-6 77 of 196

TABLE D-4 ERA (a) STATISTICAL

SUMMARY

PROFICIENCY TESTING PROGRAMa ENVIRONMENTAL, INC., 2010 (Page 1 of 1)

Concentration (pCi/L)

Lab Code Date Analysis Laboratory ERA Control Resultb Resultc Limits Acceptance STW-1205 04/05/10 Sr-89 63.0 +/- 5.7 60.4 48.6-68.2 Pass STW-1205 04/05/10 Sr-90 37.4 +/- 2.4 41.3 30.4-47.4 Pass STW-1206 04/05/10 Ba-133 63.6 +/- 3.3 65.9 54.9-72.5 Pass STW-1206 04/05/10 Co-60 83.3 +/- 2.9 84.5 76.0-95.3 Pass STW-1206 04/05/10 Cs-134 71.0 +/- 3.4

71. 6 58.4-78.8 Pass STW-1206 04/05/10 Cs-137 145.5 +/- 5.1 146.0 131.0 - 163.0 Pass STW-1206 04/05/10 Zn-65 194.9 +/- 7.8 186.0 167.0 - 219.0 Pass STW-1207 04/05/10 Gr. Alpha 26.5 +/- 1.7 32.9 16.9-42.6 Pass STW-1207 04/05/10 Gr. Beta 34.5 +/- 1.6 37.5 24.7-45.0 Pass STW-1208 04/05/10 1-131 22.7 +/- 0.8 26.4 21.9-31.1 Pass STW-1210 04/05/10 H-3 12955 +/- 332 12400.0 10800 - 13600 Pass STW-1224 10/04/10 Sr-89 65.3 +/- 5.7 68.5 55.8-76.7 Pass STW-1224 10/04/10 Sr-90 39.9 +/- 2.3 43.0 31.7-49.3 Pass STW-1225 10/04/10 Ba-133 67.2 +/- 4.3 68.9 57.5-75.8 Pass STW-1225 10/04/10 Co-60 53.2 +/- 3.3 53.4 48.1 -61.3 Pass STW-1225 10/04/10 Cs-134 47.3 +/- 5.1 43.2 34.5-47.5 Pass STW-1225 10/04/10 Cs-137 118.0 +/- 5.9 123.0 111.0 - 138.0 Pass STW-1225 10/04/10 Zn-65 107.0 +/- 8.7 102.0 91.8-122.0 Pass STW-1226 10/04/10 Gr. Alpha 30.7 +/- 2.9 42.3 21.9-53.7 Pass STW-1226 10/04/10 Gr. Beta 32.7 +/- 0.8 36.6 24.0 - 44.2 Pass STW-1227 10/04/10 1-131 28.6 +/- 1.1 27.5 22.9-32.3 Pass STW-1229 10/04/10 H-3 13682 +/- 352 12900.0 11200 -14200 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-7 78 of 196

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2010 (Page 1 of 3)

Concentration b Known Control Lab Code C Date Analysis Laboratory result Activity Limits d Acceptance STVE-1199 03/01/10 Co-57 0.01 +/- 0.03 0.00 Pass STVE-1199 03/01/10 Co-60 3.39 +/- 0.12 3.27 2.29 -4.25 Pass STVE-1199 03/01/10 Cs-134 4.74 +/- 0.15 4.39 3.07 -5.71 Pass STVE-1199 03/01/10 Cs-137 3.32 +/- 0.17 3.06 2.14-3.98 Pass STVE-1199 03/01/10 Mn-54 0.01 +/-0.05 0.00 Pass STVE-1199 03/01/10 Zn-65 8.03 +/- 0.33 7.10 4.97 -9.23 Pass STW-1200 03/01/10 Gr. Alpha 0.40 +/- 0.05 0.68 0.00-1.35 Pass STW-1200 03/01/10 Gr. Beta 3.03 +/- 0.07 3.09 1.55 -4.64 Pass STW-1201 03/01/10 Co-57 28.90 +/- 0.40 28.30 19.80 - 36.80 Pass STW-1201 03/01/10 Co-60 0.06 +/- 0.05 0.00 Pass STW-1201 03/01/10 Cs-134

-0.03 +/- 0.09 0.00 Pass STW-1201 03/01/10 Cs-137 60.60 +/- 0.60 60.60 42.40 - 78.80 Pass STW-1201 03/01/10 H-3 93.20 +/- 18.30 90.80 63.60 - 118.00 Pass STW-1201 03/01/10 Mn-54 27.80 +/- 0.40 26.90 18.80 - 35.00 Pass STW-1201 03/01/10 Sr-90

-0.10 +/- 0.60 0.00 Pass STW-1201 03/01/10 Zn-65 42.70 +/- 0.80 40.70 28.50 - 52.90 Pass STSO-1202 03/01/10 Co-57 520.00 +/- 10.80 522.00 365.00 -679.00 Pass STSO-1202 03/01/10 Co-60 599.10 +/- 2.80 622.00 435.00 - 809.00 Pass STSO-1202 03/01/10 Cs-134 666.10 +/- 4.70 733.00 513.00 - 953.00 Pass STSO-1202 03/01/10 Cs-137 774.40 +/- 4.50 779.00 545.00 - 1013.00 Pass STSO-1202 03/01/10 K-40 562.00 +/- 15.30 559.00 391.00 - 727.00 Pass STSO-1202 03/01/10 Mn-54 866.20 +/- 4.60 849.00 594.00 - 1104.00 Pass STSO-1202 03/01/10 Sr-90 225.50 +/- 11.80 288.00 202.00 - 374.00 Pass STSO-1202 03/01/10 Zn-65

-1.23 +/- 1.96 0.00 Pass STAP-1203 03/01/10 Co-57 0.01 +/- 0.02 0.00 Pass STAP-1203 03/01/10 Co-60 2.63 +/- 0.19 2.47 1.73 -3.22 Pass STAP-1203 03/01/10 Cs-134 2.21 +/- 0.34 2.13 1.49 -2.77 Pass STAP-1203 03/01/10 Cs-137 1.66 +/- 0.22 1.53 1.07 -1.99 Pass STAP-1203 03/01/10 Mn-54 3.42 +/- 0.26 3.02 2.11 -3.93 Pass STAP-1203 03/01/10 Sr-90 0.02 +/- 0.06 0.00 Pass STAP-1203 03/01/10 Zn-65

-0.05 +/- 0.11 0.00 Pass STAP-1204 03/01/10 Gr. Alpha 0.13 +/- 0.03 0.43 0.00 -0.85 Pass STAP-1204 03/01/10 Gr. Beta 1.46 +/- 0.07 1.29 0.65 -1.94 Pass

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2010 (Page 2 of 3)

Concentration b Lab Code ° Date Analysis STW-1211 08/01/10 Co-57 STW-1211 08/01/10 Co-60 STW-1211 08/01/10 Cs-134 STW-1211 08/01/10 Cs-137 STW-1211 08/01/10 H-3 STW-1211 08/01/10 K-40 STW-1211 08/01/10 Mn-54 STW-1211 08/01/10 Sr-90 STW-1211 08/01/10 Zn-65 Known Laboratory result Activity 36.40 +/- 4.80 36.00 28.30 +/- 1.00 28.30 29.30 +/- 2.10 31.40 44.60 +/- 1.80 44.20 503.60 +/- 12.80 453.40 38.50 +/- 2.50 38.90 0.10 +/- 0.30 0.00 9.20 +/- 1.30 8.30 32.80 +/- 3.00 31.00 Control Limits d 25.20 - 46.80 19.80 -36.80 22.00 - 40.80 30.90 - 57.50 317.40 -589.40 27.20 - 50.60 5.80 - 10.80 21.70 - 40.30 Acceptance Pass Pass Pass Pass Pass Pass Pass Pass Pass STW-1212 08/01/10 Gr. Alpha STW-1212 08/01/10 Gr. Beta 1.54 +/- 0.09 1.92 4.13 +/-0.15 4.39 0.58 - 3.26 2.20-6.59 Pass Pass STVE-1213 08/01/10 Co-57 9.60 +/- 0.54 STVE-1213 08/01/10 Co-60 0.05 +/-0.08 STVE-1213 08/01/10 Cs-134 4.83 +/- 0.26 STVE-1213 08/01/10 Cs-137 6.45 +/- 0.66 STVE-1213 08/01/10 Mn-54 7.12 +/- 0.66 STVE-1213 08/01/10 Zn-65 6.05 +/- 0.74 STSO-1214 08/01/10 Co-57 0.10 +/- 1.60 0.00 STSO-1214 08/01/10 Co-60 370.00 +/- 6.00 343.00 STSO-1214 08/01/10 Cs-134 1005.00 +/- 21.00 940.00 STSO-1214 08/01/10 Cs-137 755.00 +/- 15.00 670.00 STSO-1214 08/01/10 K-40 783.00 +/- 54.00 699.00 STSO-1214 08/01/10 Mn-54 942.00 +/- 15.00 820.00 STSO-1214 08/01/10 Sr-90 3.50 +/- 8.00 0.00 STSO-1214 08/01/10 Zn-65 310.00 +/- 18.00 265.00 STAP-1215 08/01/10 Co-57 4.47 +/- 0.21 STAP-1215 08/01/10 Co-60 3.15 +/- 0.30 STAP-1215 08/01/10 Cs-134 3.03 +/- 0.17 STAP-1215 08/01/10 Cs-137 0.01 +/- 0.05 STAP-1215 08/01/10 Mn-54 3.69 +/- 0.39 STAP-1215 08/01/10 Sr-90 1.00 +/- 0.12 STAP-1215 08/01/10 Zn-65 0.03 +/- 0.15 5.79 - 10.75 3.35-6.23 4.12 64 4.40-8.17 3.77-7.01 8.27 0.00 4.79 5.88 6.29 5.39 4.08 2.92 2.98 0.00 3.18 1.01 0.00 Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass 240.00 - 446.00 658.00 - 1222.00 469.00 - 871.00 489.00 - 909.00 574.00 - 1066.00 186.00 - 345.00 2.86-5.30 2.04 - 3.80 2.09 - 3.87 2.23-4.13 0.71 - 1.31 D-9 80 of 196

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2010 (Page 3 of 3)

Concentration b Known Control Lab Code ° Date Analysis Laboratory result Activity Limits d Acceptance STAP-1216 08/01/10 Gr. Alpha 0.01 +/- 0.01 0.00 Pass STAP-1216 08/01/10 Gr. Beta 0.54 +/- 0.05 0.50 0.25 -0.75 Pass a Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the Department of Energy's Mixed Analyte Performance Evaluation Program, Idaho Operations office, Idaho Falls, Idaho b Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation).

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

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

e Included in the testing series as a "false positive".

D-10 81 of 196

APPENDIX E EFFLU ENT DATA 82 of 196

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

SUMMARY

........................................................................................................................... 2 1.0. EFFLUENTS..................................................................................................... 3 1.1. Gaseous Effluents to the Atmosphere.................................................. 3 1.2. Liquids Released to Illinois River........................................................... 3 2.0. SOLID RADIOACTIVE WASTE....................................................................... 3 3.0. DOSE TO MAN................................................................................................. 3 3.1. Gaseous Effluent Pathways.................................................................. 3 3.1.1. Noble Gases............................................................................ 3 3.1.1.1. Gamma Dose Rates.................................................. 3 3.1.1.2. Beta Air and Skin Dose Rate.................................... 4 3.1.2. Radioactive Iodine................................................................... 4 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 83 of 196

Table of Contents (cont.)

APPENDIX E -1 DATA TABLES AND FIGURES............................................................. E-1.1 Station Releases Gaseous Effluents Summation of all Releases............................ E-1.2 Liquid Effluents Summation of all Releases................................. E-1.3 Solid Radwaste Annual Report.................................................... E-1.4 Maximum Doses Resulting from Airborne Releases.................... E-1.5 Maximum Doses Resulting from Liquid Effluents.......................... E-1.9 10CFR20 Compliance Assessment.............................................. E-1.13 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data............................................. E-1.17 Table 1.1-1 Table 1.2-1 Table 2.0-1 Table 3.1-1 Table 3.2-1 Table 3.3.1 Table 3.4-1 ii 84 of 196

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 85 of 196

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 3.74E-01 mrem for the year, where a shielding and occupancy factor of 0.7 is assumed. The assessment of radiation doses is performed in accordance with the Offsite Dose Calculation Manual (ODCM), specifically, a comparison of preoperational studies with operational controls or with previous environmental surveillance reports and an assessment of the observed impacts of the plant operation on the environment.

Control locations are basis for "preoperational data." Yearly data comparisons are provided in Sections 5.1 and 5.2; five-year graphical trend data is provided in Appendix III, Section 7.0.

The results of analysis confirm that the station is operating in compliance with 10CFR50 Appendix I, 10CFR20 and 40CFR190.

2 86 of 196

1.0 EFFLUENTS 1.1 Gaseous Effluents to the Atmosphere Measured concentrations of noble gases, radioiodine, and particulate radioactivity released to the atmosphere during the year, are listed in Table 1.1-1. A total of 1.92E+03 curies of fission and activation gases were released with an average release rate of 6.06E+01 pCi/sec.

A total of 3.11E-02 curies of 1-131 was released during the year with an average release rate of 9.88E-04 pCi/sec.

A total of 9.54E-03 curies of beta-gamma emitters was released as airborne particulate matter with an average release rate of 3.03E-04 pCi/sec. Alpha-emitting radionuclides were below the lower limit of detection (LLD).

A total of 4.38E+01 curies of tritium was released with an average release rate of 1.39E+00 pCi/sec.

1.2 Liquids Released to Illinois River There were no liquid batch releases in 2010.

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 2010 Radioactive Effluent Release Report. The submittal date of this report was April 26, 2011.

3.0 DOSE TO MAN 3.1 Gaseous Effluent Pathways Table 3. 1-1 summarizes the doses resulting from releases of airborne radioactivity via the different exposure pathways.

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

87 of 196

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 3.03E-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 1.17E-02 mrem. (Table 3.4-1).

The maximum gamma air dose was 4.01 E-02 mrad (Table 3.1-1) and 3.66E-03 mrad based on concurrent meteorological data (Table 3.4-1).

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

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

However, the actual dose to sensitive skin tissues is difficult to calculate due to the effect of the beta particle energies, thickness of inert skin and clothing covering sensitive tissues. For purposes of this report the skin is taken to have a thickness of 7.0 mg/cm2 and an occupancy factor of 1.0 is used.

The skin dose from beta and gamma radiation for the year was 3.19E-02 (Table 3.1-1) and 3.91E-03 mrem (Table 3.4-1) based on concurrent meteorological data.

The maximum offsite beta dose for the year was 1.24E-03 mrad (Table 3.1-1) and 1.34E-03 mrad (Table 3.4-1) based on concurrent meteorological data.

3.1.2 Radioactive Iodine The human thyroid exhibits a significant capacity to 4

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concentrate ingested or inhaled iodine.

The radioiodine, 1-131, released during routing operation of the plant, may be made available to man resulting in a dose to the thyroid.

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

3.1.2.1 Dose to Thyroid The hypothetical thyroid dose to a maximum exposed individual living near the station via ingestion of milk was calculated. The radionuclide considered was 1-131 and the source of milk was taken to be the nearest dairy farm with the cows pastured from May through October.

The maximum thyroid does due to 1-131 was 1.10E-01 mrem for the year (Table 3.1-1).

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

Not all of these pathways are significant or applicable at a given time but a reasonable approximation of the dose can be made by adjusting the dose formula for season of the year or type and degree of use of the aquatic environment.

NRC developed equations* were used to calculate the doses to the whole body, lower gastro-intestinal tracts, thyroid, bone and skin; specific parameters for use in the equations are given in the Offsite Dose Calculation Manual. The maximum whole body dose was 0.00E+00 mrem and organ dose was 0.00E+00 for the year mrem (Table 3.2-1).

3.3 Assessment of Dose to Member of Public During the period January to December, 2010, LaSalle County Station did not exceed these limits as shown in Table 3.1-1 and Table 3.2-1 (based on annual average meteorological data), and As shown in Table 3.3-1:

The Radiological Effluent Technical Standards (RETS) limits on dose or dose commitment to an individual due to radioactive materials in liquid effluents from each reactor unit (1.5 mrem to the whole body or 5 mrem to any organ 5

89 of 196

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 99.6% during 2010.

Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1) 6 90 of 196

APPENDIX E-1 DATA TABLES FIGURES

Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

UNITS ONE AND TWO DOCKET NUMBERS 50-373 AND 50-374 GASSEOUS EFFLENTS SUMMATION OF ALL RELEASES A. Fission and Activation Gas

1. Total Release Activity Ci 6.01 E+02 3.87E+02 3.88E+

2. Average Release Rate uCi/sec 7.64E+01 4.92E+01 4.88E+

3. Percent of Technical Specification Limit B. Iodine

1. Total 1-131 Activity Ci 1.56E-02 3.78E-03 5.43E-

2. Average Release Rate uCi/sec 1.99E-03 4.81 E-04 6.84E-

3. Percent of Technical Specification Limit C. Particulate (> 8 day half-life)

1. Gross Activity Ci 1.29E-02 1.46E-03 2.03E-

2. Average Release Rate uCi/sec 1.66E-03 1.86E-04 2.56E-

3. Percent of Technical Specification Limit D. Tritium

1. Total Release Activity Ci 1.07E+01 1.38E+01 1.06E+

2. Average Release Rate uCi/sec 1.36E+00 1.75E+00 1.34E+

3. Percent of Technical Specification Limit E. Gross Alpha

1. Total Release Activity Ci

<1.OOE-11

<1.OOE

2. Average Release Rate uCi/sec

<LLD

3. Percent of Technical Specification Limit F. Carbon-14

1. Total Release Activity Ci 4.59E+00 4.59E+00 4.60E+

2. Average Release Rate uCi/sec 5.84E-01 5.84E-01 5.79E

3. Percent of Technical Specification Limit This information is contained in the Radiological Impact on Man section of the report.

Indicates activity of sample is less than LLD given in uCi/mI E-1.2 92 of 196 Units 2nd Qtr 3rd Qtr 1st Qtr Estimated Total Error %

rt Q

02 5.39E+02 01 6.78E+01 03 6.33E-03 04 7.97E-04 03 1.95E-03 04 2.45E-04 01 8.65E+00 00 1.09E+00

-11

<1.OOE-11

<LLD 00 4.60E+00 01 5.79E-01 2.50E+01 1.50E+01 3.50E+01 1.50E+01 3.50E+01

Table 1.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

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

Units A. Fission and Activation Products

1. Total Activity Released Ci

<LLD

2. Average Concentration Released uCi/ml

<LLD

3. Percent of Applicable Limit B. Tritium

1. Total Activity Released

2. Average Concentration R

3. Percent of Applicable Lim C. Dissolved Noble Gases

1. Total Activity Released

2. Average Concentration R

3. Percent of Applicable Lim D. Gross Alpha

1. Total Activity Released (estimate)

Ci

<LLD

2. Average Concentration Released uCi/ml

<LLD

3. Percent of Applicable Limit Ci

<LLD

<LLD eleased uCi/mI

<LLD

<LLD it Ci

<LLD

<LLD eleased uCi/ml

<LLD

<LLD It N/A N/A N/A N/A F. Volume of Dilution Water liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A

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

"<" Indicates activity of sample is less than LLD given in uCi/ml E-1.3 93 of 196 E. Volume of Liquid Waste to Discharge N/A liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00

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 2010 Effluent Report.

E-1.4 94 of 196

Table 3.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 INFANT RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD)

(WSW)

BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD)

(ESE)

TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM)

(WSW)

SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM)

(WSW)

ORGAN 3.85E-02 3.79E-02 3.81E-02 3.79E-02 1.52E-01 (MREM)

(ESE)

BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10CFR 50 APP. I INFANT RECEPTOR

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY

% OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I GAMMA AIR (MRAD) 5.0 0.25 0.14 0.16 0.25 10.0 0.40 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.01 TOT. BODY (MREM) 2.5 0.38 0.21 0.23 0.39 5.0 0.61 SKIN (MREM) 7.5 0.13 0.07 0.08 0.13 15.0 0.21 ORGAN (MREM) 7.5 0.51 0.51 0.51 0.51 15.0 1.02 BONE BONE BONE BONE BONE E-1.5 95 of 196

Table 3.1-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 CHILD RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD)

(WSW)

BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD)

(ESE)

TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM)

(WSW)

SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM)

(WSW)

ORGAN 3.42E-02 1.13E-01 1.53E-01 7.34E-02 3.74E-01 (MREM)

(NNE)

BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10CFR 50 APP. I CHILD RECEPTOR

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR OBJ JAN-MAR APR-JUN GAMMA AIR (MRAD) 5.0 0.25 0.14 BETA AIR (MRAD) 10.0 0.00 0.00 TOT. BODY (MREM) 2.5 0.38 0.21 SKIN (MREM) 7.5 0.13 0.07 ORGAN (MREM) 7.5 0.46 1.51 3RD QTR 4TH QTR YRLY

% OF JUL-SEP OCT-DEC OBJ APP. I 0.16 0.25 10.0 0.40 0.00 0.00 20.0 0.01 0.23 0.39 5.0 0.61 0.08 0.13 15.0 0.21 2.04 0.98 15.0 2.49 BONE BONE BONE BONE BONE E-1.6 96 of 196

Table 3.1-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 TEENAGER RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD)

(WSW)

BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD)

(ESE)

TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM)

(WSW)

SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM)

(WSW)

ORGAN 1.66E-02 4.90E-02 6.56E-02 3.25E-02 1.64E-01 (MREM)

(NNE)

BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10CFR 50 APP. I TEENAGER RECEPTOR

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY

% OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I GAMMA AIR (MRAD) 5.0 0.25 0.14 0.16 0.25 10.0 0.40 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.01 TOT. BODY (MREM) 2.5 0.38 0.21 0.23 0.39 5.0 0.61 SKIN (MREM) 7.5 0.13 0.07 0.08 0.13 15.0 0.21 ORGAN (MREM) 7.5 0.22 0.65 0.88 0.43 15.0 1.09 BONE BONE BONE BONE BONE E-1.7 97 of 196

Table 3.1-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 ADULT RECEPTOR 1ST 2ND 3RD 4TH TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC GAMMA AIR 1.26E-02 7.01E-03 7.75E-03 1.27E-02 4.01E-02 (MRAD)

(WSW)

BETA AIR 3.97E-04 2.55E-04 2.24E-04 3.62E-04 1.24E-03 (MRAD)

(ESE)

TOT. BODY 9.56E-03 5.30E-03 5.86E-03 9.63E-03 3.03E-02 (MREM)

(WSW)

SKIN 1.01E-02 5.59E-03 6.15E-03 1.01E-02 3.19E-02 (MREM)

(WSW)

ORGAN 1.55E-02 3.53E-02 4.56E-02 2.51E-02 1.21E-01 (MREM)

(NNE)

BONE BONE BONE BONE BONE THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10CFR 50 APP. I ADULT RECEPTOR

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I GAMMA AIR (MRAD) 5.0 0.25 0.14 0.16 0.25 10.0 0.40 BETA AIR (MRAD) 10.0 0.00 0.00 0.00 0.00 20.0 0.01 TOT. BODY (MREM) 2.5 0.38 0.21 0.23 0.39 5.0 0.61 SKIN (MREM) 7.5 0.13 0.07 0.08 0.13 15.0 0.21 ORGAN (MREM) 7.5 0.21 0.47 0.61 0.33 15.0 0.81 BONE BONE BONE BONE BONE E-1.8 98 of 196

Table 3.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 INFANT RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10 CFR 50 APP. I

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY

% OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 E-1.9 99 of 196

Table 3.2-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 INFANT RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 40 CFR 141 TYPE ANNUAL LIMIT

% OF LIMIT TOTAL 4.0 MREM 0.000 BODY INTERNAL 4.0 MREM 0.000 ORGAN E-1.10 100 of 196

Table 3.2-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 CHILD RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10 CFR 50 APP. I

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY

% OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 E-1.11 101 of 196

Table 3.2-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM PERIOD OF RELEASE - 01/01/10 TO 12/31/10 CALCULATED 03/21/11 CHILD RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 40 CFR 141 TYPE ANNUAL LIMIT OF LIMIT TOTAL 4.0 MREM 0.000 BODY INTERNAL 4.0 MREM 0.000 ORGAN E-1.12 102 of 196

Table 3.2-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/10 TO 12/31/10 CALCULATED 03/21/11 TEENAGER RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10 CFR 50 APP. I

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 E-1.13 103 of 196

Table 3.2-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM PERIOD OF RELEASE - 01/01/10 TO 12/31/10 CALCULATED 03/21/11 TEENAGER RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 40 CFR 141 TYPE ANNUAL LIMIT OF LIMIT TOTAL 4.0 MREM 0.000 BODY INTERNAL 4.0 MREM 0.000 ORGAN E-1.14 104 of 196

Table 3.2-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE ACTUAL 2010 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 ADULT RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 10 CFR 50 APP. I

% OF APP I. ------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY

% OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 0.00 0.00 0.00 0.00 3.0 0.00 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 10.0 0.00 E-1.15 105 of 196

Table 3.2-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 2010 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM PERIOD OF RELEASE - 01/01/10 TO 12/31/10 - CALCULATED 03/21/11 ADULT RECEPTOR 1ST 2ND 3RD 4TH DOSE TYPE QUARTER QUARTER QUARTER QUARTER ANNUAL JAN-MAR APR-JUN JUL-SEP OCT-DEC TOTAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BODY INTERNAL 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2010 COMPLIANCE STATUS - 40 CFR 141 TYPE ANNUAL LIMIT

% OF LIMIT TOTAL 4.0 MREM 0.000 BODY INTERNAL 4.0 MREM 0.000 ORGAN E-1.16 106 of 196

Table 3.3-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 1.

10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr 4.83E-01 10 CFR 20.1301 (a)(1) limit mrem/yr 100.0

% of limit 0.48 Compliance Summary - 10CFR20 1st 2nd 3rd 4th

% of Qtr Qtr Qtr Qtr Limit TEDE 8.91E-02 1.29E-01 1.37E-01 1.28E-01 0.48 E-1.17 107 of 196

Table 3.3-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 2.

10 CFR 20.1301 (d)/40 CFR 190 Compliance Dose Limit

% of (mrem)

(mrem)

Limit Whole Body Plume 3.03E-02 (DDE)

Skyshine 3.26E-01 ISFSI 2.94E-02 Ground 9.83E-04 Total 3.86E -01 25.0 1.54 Organ Dose Thyroid 1.10E-01 75.0 0.15 (CDE)

Gonads 9.63E-02 25.0 0.39 Breast 9.62E-02 25.0 0.38 Lung 9.62E-02 25.0 0.38 Marrow 9.63E-02 25.0 0.39 Bone 9.63E-02 25.0 0.39 Remainder 9.63E-02 25.0 0.39 CEDE 9.67E-02 TEDE 4.83E-01 100.0 0.48 E-1.18 108 of 196

Table 3.3-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 1.

10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr 3.81E-01 10 CFR 20.1301 (a)(1) limit mrem/yr 100.0 of limit 0.38 Compliance Summary - 10CFR20 1st 2nd 3rd 4th

% of Qtr Qtr Qtr Qtr Limit TEDE 9.56E-02 9.51E-02 9.39E-02 9.70E-02 0.38 E-1.19 109 of 196

Table 3.3-1 (continued)

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2010)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/10 TO 12/31/10 CALCULATED 03/21/11 2.

10 CFR 20.1301 (d)/40 CFR 190 Compliance Dose Limit of (mrem)

(mrem)

Limit Plume 0.00E+00 Skyshine 3.52E-01 ISFSI 2.94E-02 Ground 0.00E+00 Total 3.81E-01 25.0 1.52 Thyroid 0.00E+00 75.0 0.00 Gonads 0.00E+00 25.0 0.00 Breast 0.00E+00 25.0 0.00 Lung 0.00E+00 25.0 0.00 Marrow 0.00E+00 25.0 0.00 Bone 0.00E+00 25.0 0.00 Remainder 0.00E+00 25.0 0.00 CEDE 0.00E+00 TEDE 3.81E-01 100.0 0.38 Whole Body (DDE)

Organ Dose (CDE)

E-1.20 110 of 196

Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data LaSalle County Generating Station:

Dose gamma air (')

beta air (2) whole body (3) skin (4) organ (5) (infant-thyroid)

Maximum Value 3.660 x 10"3 mrad 1.340 x 10"3 mrad 1.169 x 10"2 mrem 3.910 x 10"3 mrem 6.567 x 10-1 mrem Sector Affected East-Southeast East-Southeast East-Southeast East-Southeast East-Southeast Compliance Status 10 CFR 50 Appendix I gamma air beta air whole body skin organ Yearly Objective 10.0 mrad 20.0 mrad 5.0 mrem 15.0 mrem 15.0 mrem

% of Appendix 1 0.04 0.01 0.23 0.03 4.38 (1)

Gamma Air Dose - GASPAR II, NUREG-0597 (2)

Beta Air Dose - GASPAR II, NUREG-0597 (3)

Whole Body Dose - GASPAR II, NUREG-0597 (4)

Skin Dose - GASPAR II, NUREG-0597 (5)

Inhalation and Food Pathways Dose - GASPAR II, NUREG-0597 E-1.21 111 of 196

APPENDIX F METEOROLOG ICAL DATA 112 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 2

2 1

0 0

5 NNE 0

3 8

12 2

0 25 NE 0

0 3

8 0

0 11 ENE 0

0 0

E 0

0 0

ESE 0

2 4

0 0

0 6

SE 1

1 4

0 0

0 6

SSE 0

1 0

0 0

0 1

S 2

1 0

0 0

0 3

SSW 1

0 0

3 1

0 5

SW 0

0 0

1 0

0 1

WSW 0

0 0

5 0

0 5

W 0

0 0

3 1

0 4

WNW 0

0 1

0 0

0 1

NW 0

0 1

0 0

0 1

NNW 0

0 4

0 0

0 4

Variable 0

0 0

Total 4

10 27 33 4

0 78 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-1 113 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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

0 0

2 NNE 0

0 23 21 0

0 44 NE 0

1 6

6 0

0 13 ENE 0

0 1

1 1

0 3

E 0

1 1

0 0

0 2

ESE 0

1 6

0 0

0 7

SE 0

4 0

0 0

0 4

SSE 0

0 1

0 0

0 1

S 0

0 1

5 0

0 6

SSW 0

0 0

0 2

SW 0

0 1

0 0

0 1

WSW 0

0 0

2 1

0 3

W 0

0 2

2 0

0 4

WNW 0

0 1

0 0

0 1

NW 0

0 2

0 0

0 2

NNW 0

1 1

0 0

0 2

Variable 0

0 0

Total 0

10 46 37 4

0 97 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-2 114 of 196

LaSalle County Generating Station Period of Record: January - March 2010 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 4

3 1

0 0

8 NNE 0

0 6

5 0

0 11 NE 0

0 1

9 0

0 10 ENE 0

0 0

5 0

0 5

E 0

1 8

5 0

0 14 ESE 0

1 7

10 0

0 18 SE 0

1 1

1 0

0 3

SSE 0

0 1

0 0

0 1

S 0

1 1

4 0

0 6

SSW 1

2 0

1 0

0 4

SW 0

0 2

3 0

0 5

WSW 0

0 4

7 1

0 12 W

0 1

20 8

2 0

31 WNW 0

2 4

1 0

0 7

NW 0

0 0

1 0

0 1

NNW 1

4 1

0 0

0 6

Variable 0

0 0

Total 2

17 59 61 3

0 142 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-3 115 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 55 34 2

0 0

93 NNE 0

26 45 27 2

0 100 NE 0

9 10 10 3

0 32 ENE 1

7 9

28 1

0 46 E

1 14 28 11 11 0

65 ESE 1

13 25 8

0 0

47 SE 5

14 9

6 0

0 34 SSE 0

7 2

2 0

0 11 S

4 11 3

4 1

0 23 SSW 1

6 3

2 1

0 13 SW 5

8 12 5

0 0

30 WSW 5

15 16 6

0 0

42 W

0 22 50 26 14 2

114 WNW 1

13 83 68 5

0 170 NW 1

20 35 24 0

0 80 NNW 0

31 42 39 11 0

123 Variable 0

0 0

Total 27 271 406 268 49 2

1023 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:

3 F-4 116 of 196

LaSalle County Generating Station Period of Record: January - March 2010 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 15 6

0 0

0 22 NNE 1

14 14 2

0 0

31 NE 2

2 4

1 0

0 9

ENE 0

1 12 2

0 0

15 E

1 16 16 1

1 0

35 ESE 0

8 8

3 0

0 19 SE 1

8 9

8 0

0 26 SSE 1

5 4

1 0

0 11 S

1 4

2 3

0 0

10 SSW 2

6 2

11 1

0 22 SW 2

4 3

9 2

0 20 WSW 1

3 2

1 0

0 7

W 1

12 34 1

7 1

56 WNW 0

14 57 11 1

0 83 NW 0

7 33 2

0 0

42 NNW 2

9 21 1

0 0

33 Variable 0

0 0

Total 16 128 227 57 12 1

441 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-5 117 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 6

0 0

8 NNE 0

0 0

NE 0

0 0

ENE 0

0 2

0 0

0 2

E 0

6 9

0 0

0 15 ESE 0

6 8

1 0

0 15 SE 0

7 2

0 0

0 9

SSE 2

4 1

3 0

0 10 S

0 1

1 7

0 0

9 SSW 0

1 3

15 3

0 22 SW 0

0 8

1 2

0 11 WSW 1

4 9

2 0

0 16 W

0 14 33 0

0 0

47 WNW 0

26 31 0

0 0

57 NW 0

6 11 0

0 0

17 NNW 0

4 1

0 0

0 5

Variable 0

0 0

Total 5

85 119 29 5

0 243 Hours of calm in this stability class:

1 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-6 118 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

2 3

0 0

0 5

ESE 0

4 1

0 0

0 5

SE 0

8 4

0 0

0 12 SSE 0

6 0

0 0

0 6

S 0

2 1

0 0

0 3

SSW 0

0 9

1 0

0 10 SW 0

0 1

1 0

0 2

WSW 0

1 6

1 0

0 8

W 0

10 24 0

0 0

34 WNW 0

13 29 0

0 0

42 NW 1

2 0

0 0

0 3

NNW 1

0 0

0 1

Variable 0

0 0

Total 2

48 78 3

0 0

131 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-7 119 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

2 2

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

2 2

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:

3 F-8 120 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 1

0 0

1 NNE 0

0 0

NE 0

0 0

0 1

1 2

ENE 0

0 0

E 0

0 0

0 1

1 2

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

1 2

2 5

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:

3 F-9 121 of 196

LaSalle County Generating Station Period of Record: January - March 2010 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 3

0 0

3 NNE 0

0 0

2 2

0 4

NE 0

0 0

5 3

3 11 ENE 0

0 0

E 0

0 0

1 ESE 0

0 0

SE 0

1 1

1 0

0 3

SSE 0

0 0

S 1

0 0

0 3

0 4

SSW 0

0 0

0 3

2 5

SW 0

0 0

WSW 0

0 0

0 2

1 3

W 0

0 0

0 5

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 1

1 1

11 18 7

39 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:

3 F-10 122 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 6

40 35 2

4 87 NNE 0

14 46 52 61 12 185 NE 0

3 5

26 33 10 77 ENE 1

7 5

17 21 3

54 E

2 10 14 15 10 2

53 ESE 1

7 15 17 11 0

51 SE 0

3 20 19 9

3 54 SSE 1

1 12 6

0 0

20 S

3 9

5 6

5 0

28 SSW 3

2 5

5 2

4 21 SW 4

6 13 2

3 4

32 WSW 2

5 8

22 10 2

49 W

0 8

14 28 25 13 88 WNW 0

6 30 74 22 8

140 NW 0

5 27 40 55 11 138 NNW 0

5 13 32 7

15 72 Variable 0

0 0

Total 17 97 272 396 276 91 1149 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

110 Hours of missing stability measurements in all stability classes:

3 F-11 123 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 2

6 18 6

0 33 NNE 0

4 14 9

1 3

31 NE 0

3 4

9 3

3 22 ENE 0

1 4

2 0

0 7

E 1

2 14 10 12 4

43 ESE 0

3 5

1 0

2 11 SE 0

1 3

8 6

18 36 SSE 1

3 9

5 1

7 26 S

0 5

2 4

2 12 25 SSW 1

3 3

0 3

11 21 SW 3

5 2

4 8

13 35 WSW 1

3 0

3 4

0 11 W

1 3

6 7

7 10 34 WNW 1

2 10 40 17 5

75 NW 1

9 11 27 31 8

87 NNW 0

2 1

22 22 4

51 Variable 0

0 0

Total 11 51 94 169 123 100 548 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:

3 F-12 124 of 196

LaSalle County Generating Station Period of Record: January - March 2010 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 5

7 2

14 NNE 0

0 1

0 0

0 1

NE 0

3 0

0 1

0 4

ENE 0

1 0

0 0

0 1

E 0

0 0

3 4

0 7

ESE 0

0 0

2 4

0 6

SE 0

1 1

6 9

5 22 SSE 0

0 0

2 0

5 7

S 0

0 1

3 1

0 5

SSW 0

0 0

0 1

6 7

SW 0

0 1

2 2

17 22 WSW 0

0 0

0 8

1 9

W 0

1 1

2 3

1 8

WNW 0

1 6

11 3

0 21 NW 1

1 9

19 14 0

44 NNW 0

2 3

8 10 0

23 Variable 0

0 0

Total 1

10 23 63 67 37 201 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-13 125 of 196

LaSalle County Generating Station Period of Record: January - March 2010 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 1

7 2

7 0

17 NNE 0

1 1

0 0

0 2

NE 0

0 2

0 0

0 2

ENE 0

1 0

0 0

0 1

E 0

1 0

0 0

0 1

ESE 0

0 0

0 1

SE 0

0 0

0 1

SSE 0

0 0

2 2

2 6

S 0

0 0

4 6

0 10 SSW 0

0 0

0 1

SW 0

0 0

WSW 0

0 0

0 2

W 0

0 0

4 3

0 7

WNW 0

0 0

2 0

0 2

NW 0

0 1

13 2

0 16 NNW 1

0 3

17 1

1 23 Variable 0

0 0

Total 1

4 14 44 26 3

92 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3 F-14 126 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 NNE 0

0 1

0 0

0 1

NE 0

0 0

1 0

0 1

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

1 3

5 9

SSW 0

0 0

2 2

5 9

SW 0

0 1

0 4

1 6

WSW 0

0 0

W 0

0 1

0 0

0 1

WNW 0

0 1

6 0

0 7

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 4

10 9

11 34 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-15 127 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 NNE 0

0 2

0 0

0 2

NE 0

0 1

1 0

0 2

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 1

2 4

SSW 0

0 5

4 0

1 10 SW 0

0 8

4 2

0 14 WSW 0

0 6

1 2

0 9

W 0

0 5

7 0

0 12 WNW 0

0 4

5 0

0 9

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 32 22 5

3 62 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-16 128 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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

7 1

0 0

8 NNE 0

0 5

0 0

0 5

NE 0

0 3

6 0

0 9

ENE 0

0 1

2 0

0 3

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

1 5

5 4

2 17 SSW 0

0 5

3 1

2 11 SW 0

1 4

4 2

0 11 WSW 0

0 5

5 2

0 12 W

0 1

7 9

0 0

17 WNW 0

0 4

5 1

0 10 NW 0

2 0

3 0

0 5

NNW 0

3 0

6 1

0 10 Variable 0

0 0

Total 0

8 46 49 11 4

118 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-17 129 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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

3 42 18 8

0 0

71 NNE 1

29 18 7

0 0

55 NE 1

25 34 24 1

0 85 ENE 2

19 26 32 9

0 88 E

1 25 21 16 2

0 65 ESE 1

10 14 16 19 6

66 SE 1

15 10 15 4

0 45 SSE 2

13 18 6

2 1

42 S

1 14 21 8

5 2

51 SSW 1

13 16 12 10 3

55 SW 1

12 29 14 2

0 58 WSW 2

12 13 10 2

0 39 W

0 16 24 17 7

0 64 WNW 2

14 23 24 5

0 68 NW 1

9 12 11 6

0 39 NNW 2

19 15 23 0

0 59 Variable 0

0 0

Total 22 287 312 243 74 12 950 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-18 130 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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

3 24 6

1 0

0 34 NNE 0

23 4

0 0

0 27 NE 3

4 11 1

0 0

19 ENE 0

6 17 18 0

0 41 E

3 26 44 16 3

0 92 ESE 3

7 17 4

8 0

39 SE 1

2 5

4 3

0 15 SSE 2

2 10 3

0 0

17 S

1 4

13 19 2

0 39 SSW 3

9 15 13 6

47 SW 0

7 24 13 1

0 45 WSW 2

10 24 3

0 0

39 W

1 7

24 7

5 2

46 WNW 0

14 16 0

8 2

40 NW 3

7 8

2 0

0 20 NNW 1

10 9

2 0

0 22 Variable 0

0 0

Total 26 162 247 106 36 5

582 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-19 131 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 11 1

0 0

0 13 NNE 0

2 0

0 0

0 2

NE 1

0 0

0 1

ENE 1

1 1

0 0

0 3

E 4

14 19 1

0 0

38 ESE 0

18 10 0

0 0

28 SE 1

8 10 0

0 0

19 SSE 0

9 10 3

0 0

22 S

0 18 9

8 0

0 35 SSW 2

5 6

12 0

0 25 SW 2

11 17 2

0 0

32 WSW 1

10 14 0

0 0

25 W

1 14 9

0 0

0 24 WNW 1

16 6

0 0

0 23 NW 1

5 0

0 0

0 6

NNW 2

6 0

0 0

0 8

Variable 0

0 0

Total 18 148 112 26 0

0 304 Hours of calm in this stability class:

1 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-20 132 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 4

0 0

4 NNE 0

0 0

NE 0

1 0

0 0

0 1

ENE 0

0 0

E 0

2 0

0 0

0 2

ESE 0

10 0

0 0

0 10 SE 2

10 4

0 0

0 16 SSE 0

9 6

0 0

0 15 S

0 5

8 1

0 0

14 SSW 1

4 12 0

0 0

17 SW 0

7 10 0

0 0

17 WSW 2

10 6

0 0

0 18 W

1 9

3 0

0 0

13 WNW 0

5 1

0 0

0 6

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 6

76 50 1

0 0

133 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-21 133 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

1 1

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

1 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 F-22 134 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 NNE 0

0 0

NE 0

0 0

1 1

0 2

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

4 4

SSW 0

0 0

0 1

3 4

SW 0

0 0

1 1

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

1 2

8 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:

0 F-23 135 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 NNE 0

0 0

1 0

0 1

NE 0

0 0

1 2

0 3

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

4 4

SSW 0

0 0

1 3

6 10 SW 0

0 0

1 2

5 8

WSW 0

0 0

2 2

w 0

0 0

WNW 0

0 0

1 0

0 1

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

5 7

17 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 F-24 136 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 14 15 9

14 1

53 NNE 2

13 35 15 8

0 73 NE 0

15 23 35 19 6

98 ENE 0

12 21 30 28 10 101 E

0 9

20 13 19 7

68 ESE 1

17 11 10 18 25 82 SE 1

6 5

14 13 14 53 SSE 3

2 19 10 1

2 37 S

1 7

19 17 5

10 59 SSW 0

7 20 16 10 23 76 SW 0

7 30 17 20 9

83 WSW 1

10 12 21 17 4

65 W

0 9

19 23 16 7

74 WNW 0

5 22 22 30 3

82 NW 2

7 11 18 23 13 74 NNW 1

12 17 11 20 2

63 Variable 0

0 0

Total 12 152 299 281 261 136 1141 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-25 137 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 3

2 11 1

1 19 NNE 0

4 3

18 6

0 31 NE 0

8 17 16 1

0 42 ENE 0

10 19 22 10 0

61 E

1 4

16 22 10 8

61 ESE 0

2 6

15 14 11 48 SE 0

2 3

9 8

7 29 SSE 0

0 3

5 1

6 15 S

1 3

3 13 8

22 50 SSW 1

0 4

13 10 39 67 SW 1

2 11 14 29 11 68 WSW 0

2 11 24 8

2 47 W

2 4

9 21 24 4

64 WNW 1

2 5

12 14 22 56 NW 0

3 12 12 16 0

43 NNW 2

7 1

11 3

1 25 Variable 0

0 0

Total 10 56 125 238 163 134 726 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-26 138 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 3

7 0

0 0

10 NNE 0

1 4

2 2

0 9

NE 1

1 2

2 0

0 6

ENE 0

0 0

1 0

0 1

E 0

1 2

1 7

ESE 0

1 4

4 8

1 18 SE 0

0 3

7 8

6 24 SSE 0

2 2

7 5

4 20 S

1 2

2 15 10 0

30 SSW 2

1 1

9 7

3 23 SW 1

2 3

7 1

6 20 WSW 0

1 3

3 5

2 14 W

1 5

8 11 3

0 28 WNW 0

0 2

7 2

0 11 NW 0

0 0

4 2

0 6

NNW 3

0 1

5 0

0 9

Variable 0

0 0

Total 9

20 44 85 55 23 236 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-27 139 of 196

LaSalle County Generating Station Period of Record: April - June 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

3 2

0 5

S 0

0 1

3 4

1 9

SSW 0

0 1

0 3

7 11 SW 0

2 1

1 0

4 8

WSW 0

0 0

4 0

0 4

W 0

0 2

0 0

0 2

WNW 0

0 0

1 0

0 1

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

2 5

12 9

12 40 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-28 140 of 196

LaSalle County Generating Station Period of Record: July - September 2010 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 0

0 1

0 0

1 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

1 0

0 1

SSW 0

0 5

8 0

0 13 SW 0

0 3

0 1

0 4

WSW 0

0 5

4 1

2 12 W

0 0

3 0

0 0

3 WNW 0

0 2

10 0

0 12 NW 0

0 0

1 0

0 1

NNW 0

0 0

Variable 0

0 0

Total 0

0 18 25 2

2 47 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-29 141 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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 1

0 0

1 NNE 0

1 1

0 0

0 2

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

1 3

1 0

0 5

SSW 0

4 12 5

1 0

22 SW 0

5 8

7 2

0 22 WSW 0

2 5

3 1

1 12 W

0 1

8 1

0 0

10 WNW 0

1 12 5

0 0

18 NW 0

0 2

4 0

0 6

NNW 0

1 2

1 0

0 4

Variable 0

0 0

Total 0

16 53 28 4

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 F-30 142 of 196

LaSalle County Generating Station Period of Record: July - September 2010 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 4

5 0

0 0

9 NNE 0

11 1

0 0

0 12 NE 0

3 2

0 0

0 5

ENE 0

0 0

E 0

1 2

0 0

0 3

ESE 0

0 0

1 0

0 1

SE 0

0 0

SSE 0

2 3

0 0

0 5

S 0

6 16 6

0 0

28 SSW 0

10 10 3

1 0

24 SW 0

9 11 4

0 0

24 WSW 0

3 2

2 0

0 7

W 0

10 5

2 1

0 18 WNW 0

7 13 8

0 0

28 NW 0

2 7

2 0

0 11 NNW 0

0 9

6 0

0 15 Variable 0

0 0

Total 0

68 86 34 2

0 190 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-31 143 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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 35 10 0

0 0

47 NNE 3

22 10 0

0 0

35 NE 3

18 13 0

0 0

34 ENE 0

15 16 2

0 0

33 E

1 15 17 5

0 0

38 ESE 2

12 9

6 0

0 29 SE 3

15 6

0 0

0 24 SSE 5

11 20 0

0 0

36 S

4 19 33 14 1

0 71 SSW 0

21 21 11 0

0 53 SW 4

19 13 6

3 0

45 WSW 3

20 10 9

1 0

43 W

4 23 14 9

7 1

58 WNW 1

21 24 10 3

0 59 NW 0

16 19 4

0 0

39 NNW 0

18 25 8

0 0

51 Variable 0

0 0

Total 35 300 260 84 15 1

695 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-32 144 of 196

LaSalle County Generating Station Period of Record: July - September 2010 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

1 33 12 0

0 0

46 NNE 1

14 2

0 0

0 17 NE 3

4 5

0 0

0 12 ENE 3

5 12 3

0 0

23 E

0 20 20 0

0 0

40 ESE 2

13 3

0 0

0 18 SE 3

14 7

0 0

0 24 SSE 5

8 12 0

0 0

25 S

5 13 48 9

1 0

76 SSW 1

23 32 13 7

1 77 SW 2

13 11 8

2 0

36 WSW 2

13 10 3

0 0

28 W

5 14 11 5

8 4

47 WNW 5

17 16 7

1 0

46 NW 2

6 8

0 0

0 16 NNW 3

9 16 0

0 0

28 Variable 0

0 0

Total 43 219 225 48 19 5

559 Hours of calm in this stability class:

1 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-33 145 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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

3 19 0

0 0

0 22 NNE 1

3 0

0 0

0 4

NE 1

1 0

0 0

0 2

ENE 1

0 1

0 0

0 2

E 3

21 9

0 0

0 33 ESE 6

19 0

0 0

0 25 SE 5

28 2

0 0

0 35 SSE 0

20 4

0 0

0 24 S

5 31 11 0

0 0

47 SSW 2

19 21 1

1 0

44 SW 3

11 3

1 1

0 19 WSW 2

11 11 1

0 0

25 W

7 8

10 0

0 0

25 WNW 4

31 6

0 0

0 41 NW 1

5 0

0 0

0 6

NNW 1

4 2

0 0

0 7

Variable 0

0 0

Total 45 231 80 3

2 0

361 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-34 146 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

4 2

0 0

0 6

ESE 0

8 0

0 0

0 8

SE 5

21 0

0 0

0 26 SSE 1

36 0

0 0

0 37 S

1 37 2

0 0

0 40 SSW 0

39 8

0 0

0 47 SW 0

21 9

0 0

0 30 WSW 1

21 7

0 0

0 29 W

2 11 5

0 0

0 18 WNW 0

10 1

0 0

0 11 NW 0

1 0

0 0

0 1

NNW 0

0 0

Variable 0

0 0

Total 10 209 34 0

0 0

253 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-35 147 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-36 148 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

0 1

SW 0

0 0

WSW 0

0 0

1 0

1 2

w 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

1 1

1 3

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-37 149 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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

1 0

1 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

0 1

SSW 0

0 1

4 4

0 9

SW 0

0 1

2 0

1 4

WSW 0

0 1

3 0

4 8

W 0

0 4

2 0

0 6

WNW 0

0 2

4 0

0 6

NW 0

0 0

2 0

0 2

NNW 0

0 0

2 0

0 2

Variable 0

0 0

Total 0

0 9

19 6

5 39 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-38 150 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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 20 13 4

0 47 NNE 2

17 24 7

0 0

50 NE 0

4 30 14 0

0 48 ENE 0

9 11 13 2

0 35 E

1 10 16 6

1 0

34 ESE 1

12 9

12 0

0 34 SE 4

10 9

5 0

0 28 SSE 2

7 9

3 0

0 21 S

2 11 34 35 14 4

100 SSW 3

12 34 32 17 10 108 SW 0

12 41 20 18 10 101 WSW 5

10 13 12 11 2

53 W

2 15 18 10 8

4 57 WNW 0

18 33 20 15 4

90 NW 1

11 35 26 13 2

88 NNW 0

13 26 21 9

0 69 Variable 0

0 0

Total 23 181 362 249 112 36 963 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-39 151 of 196

LaSalle County Generating Station Period of Record: July - September 2010 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

0 6

6 15 9

2 38 NNE 0

2 12 15 0

0 29 NE 0

3 15 19 0

0 37 ENE 0

8 14 16 4

0 42 E

1 3

13 13 8

3 41 ESE 0

7 7

2 3

0 19 SE 2

12 11 9

3 0

37 SSE 3

5 14 8

3 0

33 S

0 2

12 17 22 5

58 SSW 1

5 10 24 45 36 121 SW 1

7 14 21 18 8

69 WSW 0

4 11 14 7

6 42 W

0 5

5 5

11 13 39 WNW 2

10 10 12 21 9

64 NW 1

7 17 8

14 2

49 NNW 3

2 4

15 3

2 29 Variable 0

0 0

Total 14 88 175 213 171 86 747 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-40 152 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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

1 2

0 2

7 NNE 1

0 2

4 0

0 7

NE 0

0 3

8 0

0 11 ENE 1

0 0

0 1

E 0

1 2

6 4

1 14 ESE 0

1 1

15 5

0 22 SE 0

1 8

14 4

0 27 SSE 1

5 7

20 1

0 34 S

1 1

9 19 12 0

42 SSW 3

2 8

20 23 7

63 SW 1

4 9

21 4

4 43 WSW 0

1 10 13 1

1 26 W

0 2

6 5

10 1

24 WNW 0

2 2

7 2

0 13 NW 0

2 6

21 6

0 35 NNW 0

1 4

13 3

0 21 Variable 0

0 0

Total 9

24 78 188 75 16 390 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-41 153 of 196

LaSalle County Generating Station Period of Record: July - September 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

6 0

0 6

S 0

0 3

11 8

1 23 SSW 0

1 5

6 0

0 12 SW 0

1 5

1 0

0 7

WSW 1

0 0

3 0

0 4

W 0

1 1

0 0

0 2

WNW 0

0 0

5 0

0 5

NW 0

0 1

6 0

0 7

NNW 0

0 0

Variable 0

0 0

Total 1

3 15 38 8

1 66 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

0 F-42 154 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

1 0

0 1

SW 0

0 0

1 0

0 1

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

2 0

0 2

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

34 F-43 155 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

2 0

0 2

SSW 0

0 1

1 2

0 4

SW 0

0 0

1 0

0 1

WSW 0

0 1

0 0

0 1

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 2

4 2

0 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:

34 F-44 156 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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

0 3

0 0

3 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 3

1 0

0 4

SSW 0

1 1

3 2

0 7

SW 0

0 2

3 1

1 7

WSW 0

0 6

3 4

1 14 W

0 0

4 8

1 0

13 WNW 0

0 6

0 0

0 6

NW 0

0 1

1 0

0 2

NNW 0

1 0

0 0

0 1

Variable 0

0 0

Total 0

2 23 22 8

2 57 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:

34 F-45 157 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 21 26 12 0

1 60 NNE 1

7 14 0

0 0

22 NE 0

4 10 1

0 0

15 ENE 0

3 14 9

0 0

26 E

0 3

17 7

1 0

28 ESE 1

4 8

7 3

0 23 SE 1

2 3

1 0

0 7

SSE 0

0 5

12 1

0 18 S

0 1

10 13 2

0 26 SSW 1

1 14 3

2 0

21 SW 1

4 16 7

9 2

39 WSW 1

8 18 22 21 7

77 W

1 10 29 27 14 0

81 WNW 1

8 39 60 12 0

120 NW 0

7 13 17 0

0 37 NNW 0

11 22 53 8

12 106 Variable 0

0 0

Total 8

94 258 251 73 22 706 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:

34 F-46 158 of 196

LaSalle County Generating Station Period of Record: October - December 2010 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24

> 24 Total N

2 30 20 0

0 0

52 NNE 4

12 6

0 0

0 22 NE 2

4 13 0

0 0

19 ENE 1

5 22 9

0 0

37 E

1 8

16 9

0 0

34 ESE 1

4 9

9 1

0 24 SE 4

3 5

13 5

4 34 SSE 3

1 6

32 9

7 58 S

1 1

6 20 3

2 33 SSW 3

3 7

12 17 1

43 SW 0

3 11 15 2

2 33 WSW 0

4 22 12 1

2 41 W

1 11 13 19 18 2

64 WNW 1

10 27 25 10 0

73 NW 0

7 24 5

0 0

36 NNW 2

11 22 9

1 0

45 Variable 0

0 0

Total 26 117 229 189 67 20 648 Hours of calm in this stability class:

1 Hours of missing wind measurements in this stability class:

1 Hours of missing stability measurements in all stability classes:

34 F-47 159 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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

6 12 2

0 0

0 20 NNE 1

3 0

0 0

0 4

NE 2

2 0

0 0

0 4

ENE 1

1 3

0 0

0 5

E 0

5 13 0

0 0

18 ESE 1

2 2

0 0

0 5

SE 1

2 7

5 0

0 15 SSE 0

3 7

9 1

0 20 S

0 9

15 8

3 0

35 SSW 0

6 23 13 1

0 43 SW 1

4 14 8

0 0

27 WSW 0

6 17 7

0 0

30 W

0 5

22 1

1 0

29 WNW 0

17 22 4

0 0

43 NW 2

9 17 0

0 0

28 NNW 0

8 2

0 0

0 10 Variable 0

0 0

Total 15 94 166 55 6

0 336 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:

34 F-48 160 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 4

0 0

4 NNE 0

0 0

NE 0

0 0

ENE 0

1 0

0 0

0 1

E 1

9 2

0 0

0 12 ESE 2

10 1

0 0

0 13 SE 1

23 4

0 0

0 28 SSE 1

19 21 2

0 0

43 S

1 15 40 3

0 0

59 SSW 1

9 35 1

0 0

46 SW 0

5 25 2

0 0

32 WSW 0

8 32 5

0 0

45 W

2 34 22 1

0 0

59 WNW 0

41 11 0

0 0

52 NW 0

6 5

0 0

0 11 NNW 1

3 0

0 0

0 4

Variable 0

0 0

Total 10 187 198 14 0

0 409 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:

34 F-49 161 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 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:

34 F-50 162 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 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:

34 F-51 163 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

S 0

0 0

SSW 0

0 0

0 1

SW 0

0 0

0 2

WSW 0

0 0

W 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

0 3

Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

34 F-52 164 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 11 7

27 27 5

77 NNE 0

12 10 17 1

0 40 NE 0

0 5

14 0

0 19 ENE 1

3 8

11 6

0 29 E

0 1

7 13 6

1 28 ESE 1

3 7

9 4

5 29 SE 0

2 3

1 5

4 15 SSE 0

1 1

5 7

1 15 S

0 1

3 13 12 9

38 SSW 1

0 5

13 4

16 39 SW 1

2 15 11 12 11 52 WSW 0

4 5

22 19 35 85 W

1 5

21 23 26 24 100 WNW 0

3 20 38 36 14 111 NW 1

5 29 21 32 6

94 NNW 0

6 7

13 40 16 82 Variable 0

0 0

Total 6

59 153 251 237 147 853 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

5 Hours of missing stability measurements in all stability classes:

34 F-53 165 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 7

3 7

14 1

32 NNE 0

9 10 13 9

0 41 NE 1

5 5

18 1

0 30 ENE 1

1 11 11 9

0 33 E

0 4

8 17 4

0 33 ESE 0

0 5

10 5

4 24 SE 1

4 2

5 4

9 25 SSE 0

4 1

3 11 36 55 S

0 2

5 1

12 35 55 SSW 0

1 2

9 6

23 41 SW 1

1 6

12 11 21 52 WSW 1

1 11 11 7

5 36 W

0 1

8 14 24 24 71 WNW 0

3 7

21 16 31 78 NW 0

2 5

15 17 11 50 NNW 0

1 11 10 15 13 50 Variable 0

0 0

Total 5

46 100 177 165 213 706 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:

34 F-54 166 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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 3

3 2

12 2

22 NNE 4

3 1

5 1

0 14 NE 0

2 1

3 0

0 6

ENE 0

4 2

0 0

0 6

E 0

4 2

2 2

1 11 ESE 0

2 2

6 3

0 13 SE 0

2 4

4 4

3 17 SSE 0

1 7

6 5

2 21 S

0 1

5 15 13 25 59 SSW 0

1 3

9 20 33 66 SW 0

2 3

12 6

9 32 WSW 0

2 6

10 12 11 41 W

1 1

3 9

23 7

44 WNW 1

2 11 10 9

1 34 NW 2

3 7

13 8

0 33 NNW 0

1 5

7 10 0

23 Variable 0

0 0

Total 8

34 65 113 128 94 442 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:

34 F-55 167 of 196

LaSalle County Generating Station Period of Record: October - December 2010 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

3 2

1 1

7 NNE 0

2 2

3 0

0 7

NE 0

0 0

ENE 0

0 0

E 0

1 0

0 2

ESE 0

0 2

0 0

0 2

SE 0

0 4

1 0

0 5

SSE 0

1 2

3 0

0 6

S 0

0 13 9

24 SSW 0

0 1

5 8

0 14 SW 0

0 1

14 7

0 22 WSW 0

0 2

4 7

2 15 W

0 2

3 5

9 0

19 WNW 0

0 1

14 3

0 18 NW 0

0 4

7 2

0 13 NNW 0

1 0

3 1

0 5

Variable 0

0 0

Total 0

7 26 75 47 4

159 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:

34 F-56 168 of 196

APPENDIX AN N UAL RADIOLOGICAL GROUNDWATER P ROTECTION PROGRAM REPORT (ARGPPR

Docket No:

50-373 50-374 LASALLE COUNTY STATION UN ITS Annual Radiological Groundwater Protection Program Report 1 January Through 31 December 2010 Prepared By Teledyne Brown Engineering Environmental Services

! 5AA Nuclear LaSalle County Station Marseilles, IL 61341 May 2011 170 of 196

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..............................................................................11 F. Trends................................................................................................................12 G. Investigations....................................................................................................12 H. Actions Taken...................................................................................................12 171 of 196

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 in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2010.

Table B-11.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2010.

ii 172 of 196

I.

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

Following baseline sampling and subsequent recommendations, LaSalle's Radiological Groundwater Protection Program (RGPP) program now consists of the six surface water and sixteen groundwater well sampling locations. The results for LaSalle's RGPP sampling efforts in 2010 are included in this report.

This is the fifth 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 2010. During that time period, 258 analyses were performed on 76 samples from 23 locations (6 surface water and 17 ground water wells). The monitoring was conducted by Station personnel.

In assessing all the data gathered for this report, it was concluded that the operation of LaSalle County Station had no adverse radiological impact on the environment, and there are no known active releases into the groundwater at LaSalle County Station.

Strontium-90 was not detected in any groundwater or surface water sample during 2010.

Naturally occurring Potassium-40 was detected in two groundwater samples and one surface water sample. Other 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 5 of 17 groundwater monitoring locations. The tritium concentrations ranged from <LLD to 610,000 +/- 59,500 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 rupture, as documented in the Station's 173 of 196

10CFR50.75(g) report.

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the second sampling in 2010.

Gross Alpha (dissolved) was not detected in any of the groundwater locations.

Gross Alpha (suspended) was detected in 4 of 14 samples affecting 4 of 10 groundwater locations analyzed. The concentrations ranged from 2.0 to 146 pCi/L. Gross Beta (dissolved) was detected in 10 of 14 samples affecting 8 of 11 groundwater locations analyzed. The concentrations ranged from 3.6 to 38 pCi/L. Gross Beta (suspended) was detected in 7 of 14 samples affecting 6 of 10 groundwater locations analyzed. The concentrations ranged from 3.0 to 1,320 pCi/L.

Hard-To-Detect analyses were performed on a select group of 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 were detected in six of seven samples affecting 4 of 4 groundwater monitoring locations analyzed. The U-234 concentrations ranged from 0.2 to 4.4 pCi/L and the U-238 concentrations ranged from 0.2 to 3.8 pCi/L. The levels detected are considered background.

2 174 of 196

Introduction The LaSalle County Station (LSCS), consisting of two boiling water reactors, each rated for 3546 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 2010.

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.

1.

The LaSalle County Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the 175 of 196

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 176 of 196

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 2010. 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.

-5 177 of 196

2.

Concentrations of strontium in groundwater and surface water.

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 and surface water.

6.

Concentrations of Cm-242 and Cm-243/244 in groundwater and surface water.

7.

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

8.

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

9.

Concentrations of Fe-55 in groundwater and surface water.

10.

Concentrations of Ni-63 in groundwater and surface water.

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 178 of 196

from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

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

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 179 of 196

tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and strontium-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s, and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue 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 180 of 196

surface water bodies, including Lake Michigan and the Mississippi River. Illinois surface water data were typically less than 100 pCi/L. Illinois River H3 results have shown

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

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

Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

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

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

IV.

Results and Discussion A.

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

Tritium Samples from 17 locations were analyzed for tritium activity (Table B-1.1, Appendix B). Tritium values ranged from <LLD to 611,000 pCi/L at well MW-LS-1045. Based on the hyrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply. Based on established aquifer flow paths the location most representative of potential offsite release into groundwater was also less than the detection limit.

Strontium Strontium-90 was analyzed for in 22 samples from 11 groundwater 181 of 196

locations and was less than the required detection limit of 1.0 pCi/liter (Table B-1.1, 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 groundwater and surface water samples during 2010. Gross Alpha (dissolved) was not detected in any of the groundwater locations analyzed. Gross Alpha (suspended) was detected in 4 of 14 samples affecting 4 of 10 groundwater locations analyzed. The concentrations ranged from 2.0 to 146 pCi/L. Gross Beta (dissolved) was detected in 10 of 14 samples affecting 8 of 10 groundwater locations analyzed.

The concentrations ranged from 3.6 to 38 pCi/L. Gross Beta (suspended) was detected in 7 of 14 samples affecting 6 of 10 groundwater locations analyzed. The concentrations ranged from 3.0 to 1,320 pCi/L. (Table B-1.1, Appendix B).

Gamma Emitters Naturally occurring K-40 was detected in two samples. The concentration ranged from 63 to 65 pCi/I. No other 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 a select group of 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 were detected in six of seven samples affecting 4 of 4 groundwater monitoring locations analyzed. The U-234 concentrations ranged from 0.2 to 4.4 pCi/L and the U-238 concentrations ranged from 0.2 to 3.8 pCi/L. The concentrations 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 182 of 196

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.

Tritium Samples from six locations were analyzed for tritium activity (Table B-11.1, Appendix B). All surface water samples were <LLD. Based on the hyrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply. Based on established aquifer flow paths the location most representative of potential offsite release into groundwater was also less than the detection limit.

Strontium No Sr-90 was detected in any surface water samples analyzed in 2010.

Gamma Emitters Naturally occurring K-40 was detected in one sample at a concentration of 61 pCi/I. No other 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.

D.

Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and Environmental Inc. (Midwest Labs) are presented in the AREOR.

E.

Leaks, Spills, and Releases 183 of 196

There was one new leak identified at LaSalle Station during the reporting period. During the June and July of 2010, a leak from the U1 Cycled Condensate (CY) tank was identified and remediated. Upon confirmation of a leak, this issue was documented in the Corrective Actions Program (CAP) and the proper reports and notifications made to Regulatory agencies and stakeholders. After isolating the U1 CY tank, the tank was drained, repaired, and returned to service. Estimations concluded that 2.0E-01 Ci of tritium were released as a result of this leak with no tritium found to have migrated offsite. Remediation activities include installation of additional groundwater monitoring wells, increased ground water sampling frequency, and natural monitored attenuation (NMA). Due to the fact that no tritium has been found to have migrated offsite, no liquid radiological release was reported in the 2010 LaSalle ARERR.

F.

Trends Analysis results from samples continue to be trended in order to assess impact to groundwater at LaSalle Station. There was one leak identified in the reporting period. Sample data from the plume arising from the leak is being trended per the LaSalle RGPP. The plume is currently dispersing with the groundwater flow as to be expected. Currently, no tritium has migrated offsite, and tritium migration offsite is not expected.

G.

Investigations One investigation was carried out during the reporting period, due to the leak identified from the U1 CY tank described above.

H.

Actions Taken

1. Compensatory Actions As a result of the leak from the U1 CY tank described above, compensatory actions were completed. The U1 CY tank was drained, repaired and returned to service, installation of additional monitoring wells, increased sampling frequency, and regulatory notifications were made to the NRC and State officials.

2. Installation of Monitoring Wells As a result of the leak from the U1 CY tank described above, there were six additional monitoring wells installed at LaSalle station: TW-LS-1 14s, TW-LS-115s, TW-LS-116s, TW-LS-117s, TW-LS-1 18s &

TW-LS-119s. These well locations were based upon input from the hydrogeology contractor (CRA) to aid in monitoring and characterizing the resultant plume from the U1 CY tank leak. 184 of 196

3. Actions to Recover/Reverse Plumes LaSalle station is currently utilizing Natural Monitored Attenuation to remediate the plume resultant from the U1 CY tank leak that occurred in June - July 2010. 185 of 196

APPENDIX A LOCATION DESIGNATION & DISTANCE 186 of 196

TABLE A-1 LaSalle County Station Groundwater Monitoring Sample Point List, 2010 Site Site Type SW-LS-101 SW-LS-1 02 SW-LS-1 03 SW-LS-1 04 SW-LS-1 05 SW-LS-106 MW-LS-101s MW-LS-1 02s MW-LS-1 03s MW-LS-1 04s MW-LS-1 05s MW-LS-1 06s MW-LS-1 07s MW-LS-108s MW-LS-1 09s MW-LS-110s MW-LS-111 s MW-LS-1 12s MW-LS-1 13s H P-2 HP-5 H P-7 HP-10 TW-LS-1 14s TW-LS-1 15s TW-LS-1 16s TW-LS-1 17s TW-LS-1 18s TW-LS-1 19s Surface Water Surface Water Surface Water Surface Water Surface Water Surface Water Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well A-1 187 of 196

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

CONTINUOUS TO BLOWDOWN LIN R

TW-LS 11 SCNE VETUFlUTIIXI KEY PLAN EXELON GENERATION COMPANY, LLC FLEETWIDE ASSESSMENT MONITORING WELL LOCATIONS LASALLE GENERATING STATION MARSEILLES, ILLINOIS ADDITIONAL MONITORING WELL LOCATION KEY PLAN cowrovnorms a ^Tu a.ra^..c=

72245-00 PRES001 figure 1

>a+aw++fem^z.^ ^rPn ^am^ ^

APPENDIX DATA TABLES 190 of 196

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SR-90 GR-A (DIS)

GR-A (SUS)

GR-B (DIS)

GR-B (SUS)

HP-10 03/17/10

< 159 HP-10 06/14/10

< 159

< 0.4 HP-10 09/13/10

< 160 HP-10 11/09/10

< 173

< 0.7

< 24.3 HP-2 03/17/10

< 159 HP-2 06/16/10

< 160

< 0.3 HP-2 09/13/10

< 157 HP-2 11/12/10

< 175

< 0.6

< 3.4 HP-5 03/18/10

< 155 HP-5 06/16/10

< 157

< 0.7 HP-5 09/13/10

< 158 HP-5 11/12/10

< 177

< 0.7

< 5.4 HP-7 03/17/10

< 158 HP-7 06/16/10

< 158

< 0.4 HP-7 09/17/10

< 158 HP-7 11/09/10

< 172

< 0.7

< 15.9 MW-LS-104S 03/19/10

< 159 MW-LS-104S 06/16/10

< 157

< 0.6 MW-LS-104S 07/07/10 611000 +/- 59500

< 0.9

< 2.2 MW-LS-104S 09/09/10 54300 +/- 5440 MW-LS-104S 11/09/10 36200 +/- 3670

< 0.9

< 3.5 MW-LS-105S 03/18/10 293 +/- 111

< 0.6

< 2.4 MW-LS-105S 06/14/10

< 164

< 0.5

< 2.3 MW-LS-105S 09/09/10 342 +/- 118 MW-LS-105S 11/09/10 232 +/- 116

< 0.6

< 3.4 MW-LS-106S 03/19/10

< 156 MW-LS-106S 06/15/10

< 159

< 0.4 MW-LS-106S 09/15/10

< 161 MW-LS-1 07S 03/18/10

< 160 MW-LS-107S 06/14/10

< 161

< 0.7 MW-LS-107S 09/09/10

< 159 MW-LS-107S 11/09/10

< 174

< 0.7

< 30.2 MW-LS-109S 06/14/10

< 177

< 0.7

< 55.4 MW-LS-11OS 03/17/10

< 161

< 0.7

< 1.9 MW-LS-11OS 06/15/10

< 173

< 0.6

< 2.4 MW-LS-111S 03/ 18/10

< 159 MW-LS-111S 06/15/10

< 160

< 0.8 MW-LS-111S 09/09/10

< 163 MW-LS-111S 11/12/10

< 172

< 0.7

< 15.1

< 7.0 26.1 +/- 17.1 < 6.2 TW-LS-114S 09/17/10

< 159 TW-LS-114S 11/09/10

< 173 TW-LS-115S 08/11/10

< 162 TW-LS-115S 09/09/10

< 156 TW-LS-115S 11/09/10

< 183 TW-LS-116S 08/11/10

< 165 TW-LS-1 16S 09/09/10

< 159 TW-LS-116S 11/09/10 197 +/- 106 TW-LS-117S 08/11/10

< 163 TW-LS-117S 09/09/10

< 161 TW-LS-117S 11/09/10

< 181 B-1 191 of 196

< 7.0 16.6 +/- 9.7

< 6.2

< 7.5 10.9 +/- 3.4 60.2 +/- 5.5 2.0 +/- 1.2 5.9 +/- 2.3

< 2.6

<7.0 21.9 +/- 13.9 < 6.2

<0.9

<3.5

<1.9

< 2.3

< 2.1 9.6 +/- 2.4

< 1.7 5.0 +/- 2.2 6.1

+/- 1.7

< 0.4 3.6 +/- 2.0

< 1.5

< 1.6 8.5 +/- 3.3 3.0 +/- 1.8 36.0 +/- 9.5

< 23.8 128.0 +/- 9.8 146.0 +/- 50.8 38.0 +/- 15.5 1320.0 +/- 94.9

< 1.1

< 2.7

< 1.8 2.1 +/- 0.7 3.6 +/- 1.9 8.0 +/- 1.7

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SR-90 GR-A (DIS)

GR-A (SUS)

GR-B (DIS)

GR-B (SUS)

TW-LS-118S 08/11/10 1210 +/- 172 TW-LS-118S 09/09/10 1290 +/- 180 TW-LS-118S 11/12/10 3200 +/- 364 TW-LS-119S 08/11/10 783 +/- 140 TW-LS-1 19S 09/09/10 1530 +/- 208 TW-LS-119S 11/09/10 407 +/- 113

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED COLLECTED IN THE VICINTY OF LASALLE COUNTY STATION, 2010 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 HP-10 06/14/10

< 15

< 20

< 1

< 2

< 3

< 1

< 3

< 2

< 3

< 12

<1

< 1

< 17

< 5 HP-10 11/09/10

<15

<25

<1

<2

<4

<1

<3

<2

<3

<12

<1

<17

<6 HP-2 06/16/10

<19

<17

<2

<5

<2

<4

<2

<4

<13

<2

<21

<7 HP-2 11/12/10

<26

<3

<6

<2

<5

<3

<5

<15

<2

<26

<8 HP-5 06/16/10

<15

<12

<1

<2

<4

<1

<3

<2

<3

<11

<1

<2

<17

<5 HP-5 11/12/10

<26

<55

<2

<3

<7

<2

<5

<3

<5

<14

<2

<24

<9 HP-7 06/16/10

<19

<18

<2

<5

<2

<4

<2

<4

<13

<2

<21

<7 HP-7 11/09/10

<14

<25

<1

<3

<1

<2

<3

<10

<1

<16

<5 MW-LS-104S 06/16/10

< 20

< 44

< 2

< 6

< 2

< 4

< 2

< 4

< 13

< 2

< 22

< 8 MW-LS-104S 07/07/10

< 26

< 3

< 6

< 3

< 6

< 3

< 5

< 8

< 2

< 3

< 20

< 7 MW-LS-104S 11/09/10

< 16

< 12

< 1

< 2

< 4

< 1

< 3

< 2

< 3

< 14

< 1

< 20

< 7 MW-LS-105S 03/18/10

< 32

< 34

< 4

< 3

< 6

< 3

< 8

< 4

< 6

< 7

<4

< 4

< 18

< 7 MW-LS-105S 06/14/10

<18

<38

<2

<4

<2

<4

<2

<4

<7

<2

<14

<4 MW-LS-105S 11/09/10

< 16

< 30

< 1

< 2

< 4

< 2

< 3

< 2

< 3

< 14

< 1

< 20

< 6 MW-LS-106S 06/15/10

< 20

< 36

< 2

< 5

< 2

< 3

< 2

< 4

< 14

< 2

< 20

< 7 MW-LS-107S 06/14/10

< 19 65 +/- 27 < 2

< 2

< 5

< 2

< 3

< 2

< 3

< 13

< 2

< 22

< 7 MW-LS-107S 11/09/10

< 20

< 17

< 2

< 5

< 2

< 4

< 2

< 4

< 14

< 2

< 21

< 7 MW-LS-109S 06/14/10

< 22 63 +/- 29 < 2

< 2

< 5

< 2

< 5

< 3

< 4

< 9

< 2

< 18

< 5 MW-LS-11OS 03/17/10

< 39

< 33

< 4

< 5

< 9

< 4

< 7

< 4

< 7

< 9

< 4

< 5

< 22

< 8 MW-LS-110S 06/15/10

<17

<18

<2

<5

<2

<4

<2

<4

<6

<2

<13

<4 MW-LS-111S 06/15/10

<19

<17

<2

<4

<2

<3

<2

<4

<13

<2

<22

<7 MW-LS-111S 11/12/10

<23

<18

<2

<5

<2

<4

<2

<4

<13

<2

<22

<6

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINTY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION AM-241 CM-242 CM-243/244 PU-238 PU-239/240 U-234 U-235 U-238 FE-55 NI-63 PERIOD MW-LS-104S 07/07/10

< 0.12

< 0.07

< 0.02

< 0.1

< 0.07 0.5 +/- 0.2 < 0.05 0.5 +/- 0.2 < 142

< 4.3 MW-LS-104S 11/09/10

< 0.14

< 0.11

< 0.18

< 0.2

< 0.06 1.3 +/- 0.3 < 0.10 1.0 +/- 0.3 < 146

< 4.8 MW-LS-105S 03/18/10

< 0.20

< 0.04

< 0.11

< 0.1

< 0.03 0.6 +/- 0.1

< 0.03 0.5

+/- 0.1 < 160

< 4.2 MW-LS-105S 06/14/10

< 0.11

< 0.06

< 0.10

< 0.2

< 0.12 0.6 +/- 0.2 < 0.07 0.5 +/- 0.2 < 109

< 4.1 MW-LS-109S 06/14/10

< 0.10

< 0.03

< 0.1

< 0.11 4.4 +/- 0.6 < 0.03 3.8 +/- 0.5 < 111

< 3.1 MW-LS-110S 03/17/10

< 0.03

< 0.2

< 0.19 0.2 +/- 0.1

< 0.05 0.2 +/- 0.1 < 71

< 4.9 MW-LS-11OS 06/15/10

< 0.12

< 0.02

< 0.09

< 0.2

< 0.08

< 0.1

< 0.05

< 0.1

< 115

< 4.1

TABLE B-11.1 CONCENTRATIONS OF TRITIUM AND STRONTIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SR-90 SW-LS-101 03/16/10

< 156 SW-LS-101 06/15/10

< 164

< 0.5 SW-LS-101 09/15/10

< 160 SW-LS-101 11/12/10

< 173 SW-LS-102 03/16/10

< 151 SW-LS-102 06/15/10

< 161

< 0.6 SW-LS-102 09/21/10

< 171 SW-LS-102 11/12/10

< 172 SW-LS-103 03/16/10

< 169 SW-LS-103 06/15/10

< 162

< 0.5 SW-LS-103 09/15/10

< 160 SW-LS-103 11/12/10

< 174 SW-LS-1 04 03/17/10

< 154 SW-LS-104 06/15/10

< 162

< 0.8 SW-LS-105 03/17/10

< 153 SW-LS-105 06/15/10

< 160

< 0.4 SW-LS-1 06 03/17/10

< 153 SW-LS-106 06/14/10

< 160

< 0.9 SW-LS-1 06 09/15/10

< 159 SW-LS-106 11/10/10

< 173

TABLE B-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED COLLECTED IN THE VICINTY OF LASALLE COUNTY STATION, 2010 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 06/15/10

<21

<19

<2

<5

<2

<4

<2

<4

<15

<2

<22

<8 SW-LS-102 06/15/10

< 19 61 +/- 29 < 2

< 2

< 4

< 2

< 3

< 2

< 3

< 13

< 2

< 22

< 5 SW-LS-103 06/15/10

< 20

< 15

< 2

< 5

<2

<4

< 2

< 4

< 14

< 2

< 23

< 6 SW-LS-104 06/15/10

< 20

< 35

< 2

< 5

< 2

< 4

< 2

<4

< 15

< 2

< 24

< 7 SW-LS-105 06/15/10

< 19

< 30

< 2

< 5

< 2

< 4

< 2

< 4

< 14

< 2

< 22

< 7 SW-LS-106 06/14/10

< 21

< 17

< 2

<2

< 5

< 2

< 4

< 2

<4

< 15

< 2

< 23

<7

RA11-022, Annual Radiological Environmental Operating Report

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