RA09-042, 2008 Annual Radiological Environmental Operating Report

2008 Annual Radiological Environmental Operating Report

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

Text

Nuclear Exelon Generation Company, LLCwww.exeloncorp.com LaSalle County Station 2601 North 21,1Road Marseilles, IL 61341-9757 RA09-04210 CFR 50 Appendix I May 15, 2009 U. S. Nuclear Regulatory Commission Attention:

Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-1 1 and NPF-1 8 NRC Docket Nos. 50-373 and 50-374

Subject:

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

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

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

Respectfully, David B. Wozniak Site Vice President LaSalle County Station Attachment cc:Regional Administrator - NRC Region ill NRC Senior Resident Inspector - LaSalle County Station Docket No:50-373 50-374 LASALLE COUNTY STATION UNITS 1 and 2 Environmental Operating Report 1 January Through 31 December 2008 Prepared By Teledyne Brown Engineering Environmental Services SM Nuclear LaSalle County Station Marseilles, IL 61341 May 2009 1 of 190 Table Of Contents

1. Summary and Conclusions ................................................................................................ 1 II.Introduction ........................................................................................................................ 2 A.Objectives of the REMP ........................................................................................ 2 B.Implementation of the Objectives .......................................................................... 2 III.Program Description ......................................................................................................... 2 A.Sample Collection .................................................................................................. 2 B.Sample Analysis .................................................................................................... 4 C.Data Interpretation ................................................................................................. 5 D.Program Exceptions

.............................................................................................. 6 E.Program Changes

................................................................................................. 8 IV.Results and Discussion ................................................................................................... 8 A. Aquatic Environment ............................................................................................. 8 1.Surface Water ............................................................................................. 8 2.Ground/well Water ...................................................................................... 9 3.Fish ............................................................................................................. 9 4.Sediment ................................................................................................... 10B.Atmospheric Environment ...................................................................................101.Airborne .................................................................................................... 10 a.Air Particulates .............................................................................. 10 b.Airborne Iodine .............................................................................. 112.Terrestrial .................................................................................................. 11 a.Milk ................................................................................................ 11 b.Food Products ............................................................................... 12 C. Ambient Gamma Radiation ................................................................................. 12 D.Land Use Survey ................................................................................................. 12 E.Summary of Results - Inter-laboratory Comparison Program ............................ 13 i 2 of 190 Appendices Appendix ARadiological Environmental Monitoring Report Summary Tables Table A-1Radiological Environmental Monitoring Program Summary for the LaSalle County Station, 2008 Appendix BLocation Designation, Distance & Direction, and Sample Collection &

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

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

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

Table C-11.1Concentrations of Tritium in Ground/well Water Samples Collected in the Vicinity of LaSalle County Station, 2008 ii 3 of 190 Table C-11.2 Table C-111.1 Table C-IV.1 Table C-V.1 Table C-V.2 Table C-V.3 Table C-VI.1 Table C-VI1.1 Table C-VII.2 Table C-V111.1 Table C-IX.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 Concentrations of Gamma Emitters in Ground/well Water Samples Collected in the Vicinity of LaSalle County Station, 2008.

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

Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of LaSalle County Station, 2008.

Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2008.

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

Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2008.

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

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

Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of LaSalle County Station, 2008.

Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of LaSalle County Station, 2008.

Quarterly TLD Results for LaSalle County Station, 2008.

Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Other and Control Locations for LaSalle County Station, 2008.

Summary of the Ambient Dosimetry Program for LaSalle County Station, 2008.

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

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

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

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

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

III 4 of 190 Figure C-6Air Particulate - Gross Beta - Station L-04 and L-07 Collected in the Vicinity of LCS, 2008.

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

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

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

Environmental, Inc., 2008 Appendix EEffluent Data Appendix FMeteorological Data Appendix GAnnual Radiological Groundwater Protection Program Report (ARGPPR)iv 5 of 190 Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the LaSalle County Station (LCS) by Exelon covers the period 1 January 2008 through 31 December 2008. During that time period, 1,451 analyses were performed on 1,351 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of LCS had no adverse radiological impact on the environment.

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

Fish (commercially and recreationally important species) and sediment samples were analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected in fish or sediment. Sediment samples hadCs-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.

1 6 of 190 II.Introduction The LaSalle County Station (LCS), consisting of two boiling water reactors, each rated for 3489 MWt, owned and operated by Exelon Corporation, is located in LaSalle County, Illinois. Unit No. 1 went critical on 16 March 1982. Unit No. 2 went critical on 02 December 1983. The site is located in northern Illinois, approximately 75 miles southwest of Chicago, Illinois.

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

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

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

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

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

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

1.Identifying significant exposure pathways.

2.Establishing baseline radiological data of media within those pathways.3.Continuously monitoring those media before and during Station operation to assess Station radiological effects (if any) on man and the environment.

III.Program Description A.Sample Collection Samples for the LCS REMP were collected for Exelon Nuclear by 7 of 190 Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. (Midwest Labs) to obtain environmental samples for the LCS REMP in 2008. Sample locations and descriptions can be found in Tables B-1 and B-2, and Figures B-1 through B-4, Appendix B.

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

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

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

Food products were collected annually in September at five locations (L-Quad C, L-Quad 1, L-Quad 2, L-Quad 3, and L-Quad 4). The control location was L-Quad C. Various types of samples were collected and placed in new unused plastic bags, and sent to the laboratory for analysis. 8 of 190 Ambient Gamma Radiation Direct radiation measurements were made using CaF2 thermoluminescent dosimeters (TLD). Each location consisted of 2 TLD sets. The TLD locations were placed on and around the LCS site as follows:

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

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

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

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

The specific TLD locations were determined by the following criteria:

1.The presence of relatively dense population; 2.Site meteorological data taking into account distance and elevation for each of the sixteen

-22 1/2 degree sectors around the site, where estimated annual dose from LCS, if any, would be most significant; 3.On hills free from local obstructions and within sight of the vents (where practical);

4.And near the closest dwelling to the vents in the prevailing downwind direction.(Two TLDs - each comprised of two CaF2 thermoluminescent phosphors enclosed in plastic - were placed at each location approximately six feet above ground level. The TLDs were exchanged quarterly and sent to Global Dosimetry for analysis.)

B.Sample Analysis This section describes the general analytical methodologies used by TBE and Environmental Inc (Midwest Labs) to analyze the environmental 9 of 190 samples for radioactivity for the LCS REMP in 2008. The analytical procedures used by the laboratories are listed in Table B-2.

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

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

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

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

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

5.Ambient gamma radiation levels at various site environs.

C.Data Interpretation The radiological and direct radiation data collected prior to LaSalle County Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, LaSalle County Station was considered operational at initial criticality. In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data: 1.Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) was defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD was intended as a before the fact estimate of a system (including instrumentation, procedure and sample type) and not as an after the fact criteria for the presence of activity.All analyses were designed to achieve the required LCS detection capabilities for environmental sample analysis.

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

5 10 of 190 2.Net Activity Calculation and Reporting of Results Net activity for a sample was calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity effecting a negative number. An MDC was reported in all cases where positive activity was not detected.

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

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

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

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

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

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

Table D-1LISTING OF SAMPLE ANOMALIES SampleLocationCollectionReason TypeCodeDate A/IL-0305/01/08Low timer reading of 158.9; possibly due to work on the lines in area.

AllL-0505/01/08Low timer reading of 93.6; hours due to power outage.

AllL-0505//15/08Low timer reading of 49.8; hours due to recent power restoration.

A/IL-0409/04/08Low reading of 166.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />; possibly due to storms in the area

-6 11 of 190 Table D-1LISTING OF SAMPLE ANOMALIES (continued)

SampleLocationCollectionReason TypeCodeDate A/IL-0509/04/08Low reading of 165.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; possibly due to storms in the area.

A/IL-0609/04/08Low reading of 165.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; possibly due to storms in area.

A/IL-0709/04/08Low reading of 167.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to storms in the area.

AllL-0809/04/08Low reading of 167.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to storms in the area.

A/IL-0309/11/08No electricity; station notified; estimated flowrate of 60 cfh.

A/IL-0309/18/08Low reading of 23.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; due to recent power restoration.

WWIL-2810/08/08No one available to open pump house; sample collected 10/16/08.

A/IL-0512/04/08Eight-day collection period; low reading of 191.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />; possibly due to power outages in the area.

A/IL-0712/04/08Eight-day collection period; low reading of 191.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to power outages in the area.

A/IL-0812/04/08Eight-day collection period; low reading of 191.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />; possibly due to power outages in the area.

A/IL-1012/24/08Low reading of 135.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />; possibly due to power failure.

A/IL-1112/31/08No electricity, breaker off; collector reset breaker.7 12 of 190 Table D-2LISTING OF MISSED SAMPLES SampleLocationCollectionReason TypeCodeDate A/IL-0505/07/08No sample; power out.

TLDL-106-207/01/08Element damaged, could not be reprocessed.

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

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

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

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

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

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium was detected in 13 of 190 five of eight samples with a range of 127 to 332 pCi/I.

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

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

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

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-11.1, Appendix C).

No tritium was detected and the 2000 pCi/L OCDM and contractually required 200 pCi/L LLDs were met.Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-11.2, Appendix C). No nuclides were detected, and all required LLDs were met.

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

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

Naturally occurring K-40 was found at all stations and ranged from 2,380 to 3,340 pCi/kg wet. No fission or activation products were 14 of 190 found.4.Sediment Aquatic sediment samples were collected at three locations (L-21, L-40 and L-41) semiannually. Locations L-40 and L-41, located downstream, could be affected by LaSalle's effluent releases. The following analysis was performed:

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

Potassium-40 was found at all stations and ranged from 7,890 to 16,500 pCi

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

B.Atmospheric Environment 1.Airborne a.Air Particulates Continuous air particulate samples were collected from nine locations on a weekly basis. The nine locations were separated into four groups: Group I (onsite) represents locations within the LCS site boundary (L-03 and L-05), Group II (near site) represents the locations near the LCS site (L-01 and L-06), Group I I I (far field) represents the control location at an intermediate distance from LCS (L-04, L-07, L-08 and L-11) and Group IV (Control) represents the control location at a remote distance (L-10). The following analyses were performed:

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

Detectable gross beta activity was observed at all locations.

Comparison of results among the four groups aid in 15 of 190 determining the effects, if any, resulting from the operation of LCS. The results from the OnSite locations (Group I) ranged from <5 to 45 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3.

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

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

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

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

Naturally occurring Be-7 due to cosmic ray activity was detected in 31 of 36 samples. These values ranged from 89 to 310 E-3 pCi/m3. Naturally occurring K-40 was not detected in any samples. All other nuclides were less than the MDC.b.Airborne Iodine Continuous air samples were collected from nine locations (L-01, L-03, L-04, L-05, L-06, L-07, L-08, L-10, and L-11) and analyzed weekly for 1-131 (Table C-V1.1, Appendix C).

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

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

The following analyses were performed:

Iodine-131 Milk samples from the location were analyzed for concentrations of 1-131 (Table C-VI 1.1, Appendix C). No nuclides were detected, and all required LLDs were met. 16 of 190 Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VI1.2, Appendix C).

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

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

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

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

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

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

D.Land Use Survey A Land Use Survey conducted during the August 2008 growing season around the LaSalle County Station (LCS) was performed by Environmental Inc. (Midwest Labs) for Exelon Nuclear to comply with Radiological Effluent Control 12.5.2 of the LaSalle's Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident, milk producing animal and garden of greater than 500 ft2 in each of the sixteen 22 1/2 degree sectors around the site. The distance 17 of 190 and direction of all locations from the LCS reactor buildings were positioned using Global Positioning System (GPS) technology. There were no changes required to the LCS REMP, as a result of this survey.

The results of this survey are summarized below.

Distance in Miles from the LCS Reactor Buildings SectorResidenceLivestockMilk Farm MilesMilesMiles A N3.94.0-B NNE1.61.7-C NE2.13.5-D ENE3.33.8-E E3.2-12.6 F ESE1.4--G SE1.74.7-H SSE1.84.7-J S1.54.7-K SSW0.7--L SW1.05.8-M WSW1.51.5-N W1.53.0-PWNW0.93.0-QNW1.84.0-R NNW1.74.6-E.Summary of Results - Inter-Laboratory Comparison Program The primary and secondary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation and water matrices (Appendix D). The PE samples, supplied by Analytics Inc., Environmental Resource Associates (ERA) and DOE's Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

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

2.ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, NELAC, state specific PT 18 of 190 program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

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

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

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

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

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

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

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

The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data. 19 of 190 APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

20 of 190 TABLE A-i RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS SURFACE WATERGR-B2447.57.37.5L-40 INDICATOR0 (PCI/LITER)(12/12)(12/12)(12/12)ILLINOIS RIVER - DOWNSTREAM (4.7/10.5)(4.6/9.9)(4.7/10.5)5.2 MILES NNW OF SITE 14-38200214214214L-21 CONTROL (2/4)(3/4)(3/4)ILLINOIS RIVER AT SENECA - UPSTREAM (181/246)(127/332)(127/332)4.0 MILES NE OF SITE GAMMA24 MN-5415<LLD<LLD CO-5815<LLD<LLD FE-5930<LLD<LLD CO-6015<LLD<LLD ZN-6530<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 0 TABLE A-l RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS SURFACE WATERNB-9515<LLD<LLD (PCI/LITER)

ZR-9530<LLD<LLD 1-13115<LLD<LLD CS-13415<LLD<LLD CS-13718<LLD<LLD BA-14060<LLD<LLD LA-14015<LLD<LLD GROUND WATERH-312200<LLD<LLD (PC]/LITER)

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F) 0 0 0 0 0 0 0 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS GROUND WATERGAMMA12 (PCI/LITER)MN-5415<LLD<LLDCO-5815<LLD<LLDFE-5930<LLD<LLDCO-6015<LLD<LLDZN-6530<LLD<LLDNB-9515<LLD<LLD ZR-9530<LLD<LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F) 0 0 0 0 0 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS GROUND WATERCS-13415<LLD<LLD (PCI/LITER)

CS-13718<LLD<LLD BA-14060<LLD<LLD LA-14015<LLD<LLD FISHGAMMA12 (PCI/KG WET)MN-54130<LLD<LLD CO-58130<LLD<LLD FE-59260<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 0 0 TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS FISHCO-60130<LLD<LLD (PCI/KG WET)

ZN-65260<LLD<LLD-NB-95NA<LLD<LLD-ZR-95NA<LLD<LLD-CS-134130<LLD<LLD-CS-137150<LLD<LLD-BA-140NA<LLD<LLD-LA-140NA<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 0 0 0 TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS SEDIMENTGAMMA6 (PCI/KG DRY)MN-54NA<LLD<LLD CO-58NA<LLD<LLD FE-59NA<LLD<LLD CO-60NA<LLD<LLD ZN-65NA<LLD<LLD NB-95NA<LLD<LLD ZR-95NA<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 0 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS SEDIMENTCS-134150<LLD<LLD (PCI/KG DRY)

CS-13718080<LLD80L-41 INDICATOR (2/4)(2/2)ILLINOIS RIVER - DOWNSTREAM (77/83)(77/83)4.6 MILES NNW OF SITE BA-140NA<LLD<LLD LA-140NA<LLD<LLD AIR PARTICULATEGR-B46610202021L-08 INDICATOR0 (E-3 PCI/CU.METER)(410/414)(52/52)(52/52)MARSEILLES (6/45)(6/41)(6/42)6.0 MILES NNW OF SITE GAMMA36 MN-54NA<LLD<LLD CO-58NA<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 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS AIR PARTICULATEFE-59NA<LLD<LLD (E-3 PCI/CU.METER)

CO-60NA<LLD<LLD-ZN-65NA<LLD<LLD-NB-95NA<LLD<LLD-ZR-95NA<LLD<LLD-CS-13450<LLD<LLD-CS-13760<LLD<LLD-BA-140NA<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 0 0 0 TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

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

LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS AIR PARTICULATELA-140NA<LLD<LLD (E-3 PCI/CU.METER)

AIR IODINEGAMMA466 (E-3 PCI/CU.METER)1-13170<LLD<LLD 0 0 MILK (PCI/LITER) 1-13120INA 0<LLD GAMMA20 MN-54 NANA 0<LLD MILK (PCI/LITER)

<LLD<LLD<LLD 0 0 0 CO-58NANA FE-59NANA CO-60NANA*THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS ZN-65NANA NB-95NANA ZR-95NANA CS-13415NA CS-13718NA BA-14060NA LA-14015NA 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 (PCI/LITER)

<LLD<LLD<LLD<LLD<LLD<LLD<LLD 0 0 0 0 0 0 0 TABLE A-I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS VEGETATIONGAMMA10 (PCI/KG WET)MN-54NA<LLD<LLDCO-58NA<LLD<LLDFE-59NA<LLD<LLDCO-60NA<LLD<LLDZN-65NA<LLD<LLD NB-95NA<LLD<LLD 0 ZR-95NA<LLD<LLD 0 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F) 0 0 0 0 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2008 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES ILREPORTING PERIOD:ANNUAL 2008 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN(M)MEAN(M)MEAN(M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSISLOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS VEGETATION1-13160<LLD<LLD (PCI/KG WET)

CS-13460<LLD<LLD CS-13780<LLD<LLD BA-140NA<LLD<LLD LA-140NA<LLD<LLD DIRECT RADIATIONTLD-QUARTERLY335NA24.621.127L-102-2 INDICATOR (MILLI-ROENTGEN/QTR.)(327/327)(8/8)(4/4)(19/32)(18/24)(23/32)0.6 MILES NNE

• THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F) 0 0 0 0 0 0 APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION

& ANALYTICAL METHODS 33 of 190 TABLE B-1:Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2008 LocationLocation Description Distance & Direction From Site A.Surface Water L-21Illinois River at Seneca, Upstream (control)4.0 miles NE L-40Illinois River, Downstream (indicator)5.2 miles NNW B.Ground/Well Water L-27LSCS Onsite Well (indicator)0 miles at station L-28-W4Marseilles Well (control)7.0 miles NW L-28-W5Marseilles Well (control)6.7 miles NW L-28-W6Marseilles Well (indicator)4.1 miles NNE C.Milk - bi-weekly / monthly L-42Biros Farm (control)14.2 miles E D.Air Particulates / Air Iodine L-01Nearsite 1 (indicator)1.5 miles NNW L-03Onsite 3 (indicator)1.0 miles ENE L-04Rte. 170 (indicator)3.2 miles E L-05Onsite 5 (indicator)0.3 miles ESE L-06Nearsite 6 (indicator)0.4 miles WSW L-07Seneca (indicator)5.2 miles NNE L-08Marseilles (indicator)6.0 miles NNW L-10Streator (control)13.5 miles SW L-1 1Ransom (indicator)6.0 miles S E.Fish L-34LaSalle Cooling Lake (indicator)2.0 miles E L-35Marseilles Pool of Illinois River, Downstream (indicator)6.5 miles NW L-36Illinois River, Upstream of Discharge (control)4.3 miles NNE F.Sediment L-21Illinois River at Seneca, Upstream (control)4.0 miles NE L-40Illinois River, Downstream (indicator)5.2 miles NNW L-41Illinois River, Downstream (indicator)4.6 miles NNW G.Food Products Quadrant 1Diane Partridge4.5 miles NE Quadrant 2Mike and Gina Welbourne3.8 miles ESE Quadrant 3Michael Olson1.5 miles WSW Quadrant 4Robert Eisers4.5 miles NW ControlEugene Clements10.0 miles NW B-134 of 190 TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2008 Location Location Description Distance & Direction From Site H.Environmental Dosimetry - TLD Inner Ring L-101-1 and -2 L-102-1 and -2 L-103-1 and -2 L-104-1 and -2 L-105-1 and -2 L-106-1 and -2 L-107-1 and -2 L-108-1 and -2 L-109-1 and -2 L-1 10-1 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 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-235 of 190 TABLE B-2:Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2008 Sample Medium Analysis Sampling Method Analytical Procedure Number Surface Water Gamma Spectroscopy Monthly composite TBE, TBE-2007 Gamma emitting radioisotope analysis from weekly grab samples.Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Surface Water Gross Beta Monthly composite TBE, TBE-2008 Gross Alpha and/or gross beta activity in from weekly grab various matrices samples.Env. Inc., W(DS)-01 Determination of gross alpha and/or gross beta in water (dissolved solids or total residue)

Surface Water Tritium Quarterly composite TBE, TBE-201 1 Tritium analysis in drinking water by liquid from weekly grab scintillation samples.Env. Inc., T-02 Determination of tritium in water (direct method)Ground/Well Water Gamma Spectroscopy Quarterly grab TBE, TBE-2007 Gamma emitting radioisotope analysis samples.Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Ground/Well Water Tritium Quarterly grab TBE, TBE-201 1 Tritium analysis in drinking water by liquid samples.scintillation Env. Inc., T-02 Determination of tritium in water (direct method)Fish Gamma Spectroscopy Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis collected via electroshocking or Env. Inc., GS-01 Determination of gamma emitters by other techniques gamma spectroscopy Sediment Gamma Spectroscopy Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis samples Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Particulates Gross Beta One-week composite of TBE, TBE-2008 Gross Alpha and/or gross beta activity in continuous air various matrices sampling through glass fiber filter paper Env. Inc., AP-02 Determination of gross alpha and/or gross beta in air particulate filters Air Particulates Gamma Spectroscopy Quarterly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis each station Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Iodine Gamma Spectroscopy Bi-weekly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis continuous air sampling through Env. Inc., 1-131-02 Determination of 1-131 in charcoal charcoal filter canisters b y gamma spectroscopy (batch method)

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

TBE, TBE-2007 Gamma emitting radioisotope analysis Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy TLD Thermoluminescence Quarterly TLDs Global Dosimetry Dosimetry comprised of two Global Dosimetry CaF2 elements.B-336 of 190 u__ UUSi U 1tlw tuasuiito xw".,., T D lLccatfcn Figure B-1 Inner Ring TLD Locations of the LaSalle County Station, 2008 B-437 of 190 Figure B-2 Outer Ring TLD Locations of the LaSalle County Station, 2008 B-538 of 190 d Ridge Weans Katu rnarr L.teiln^.a'Grundy Cauny Figure B-3 Fixed Air Sampling Locations of the LaSalle County Station, 2008 B 639 of 190 Aa*:tsh n Milk+SedimentWater Figure B-4 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2008 B-740 of 190 APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY TABLE C-1.1CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTIONL-21L-40 PERIOD 01/03/08 - 01/31/089.9 +/- 2.28.5 +/- 2.1 02/07/08 - 02/28/086.8 +/- 2.26.7 +/- 2.1 03/06/08 - 03/27/086.1+/- 2.78.1+/- 2.9 04/03/08 - 04/24/085.9 +/- 2.04.7 +/- 1.9 05/01/08 - 05/29/086.3 +/- 3.14.7 +/- 2.9 06/05/08 - 06/26/084.6 +/- 2.15.7 +/- 2.2 07/03/08 - 07/31/087.3 +/- 2.26.1+/- 2.1 08/06/08 - 08/28/088.6 +/- 2.711+/- 2.9 09/04/08 - 09/25/088.5 +/- 2.49.4 +/- 2.4 10/02/08 - 10/30/086.7 +/- 2.010 +/- 2.3 11/06/08 - 11/26/087.2 +/- 2.37.6 +/- 2.2 12/04/08 - 12/31/089.1+/- 2.48.2 +/- 2.4 MEAN7.3 +/- 3.07.5 +/- 3.9 TABLE C-1.2CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTIONL-21L-40 PERIOD 01/03/08 - 03/27/08182 +/- 110< 166 04/03/08 - 06/26/08332 +/- 123246 +/- 117 07/03/08 - 09/25/08< 175< 173 10/02/08 - 12/31/08127 +/- 83181 +/- 88 MEAN214 +/- 212214 +/- 92*THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES C-142 of 190 TABLE C-I.3CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-951-131Cs-134Cs-137Ba-140La-140 PERIOD L-2101/03/08 - 01/31/08< 1< 2< 4< 2< 3< 2< 3< 14< 1< 1< 19< 702/07/08 - 02/28/08< 2< 3< 5< 2< 4< 3< 5< 12< 2< 2< 22< 703/06/08 - 03/27/08< 3< 3< 8< 3< 6< 3< 6< 14< 3< 3< 25< 904/03/08 - 04/24/08< 3< 3< 7< 3< 6< 3< 5< 14< 3< 3< 28< 905/01/08 - 05/29/08< 1< 2< 3< 1< 3< 2< 3< 9< 1< 2< 15< 406/05/08 - 06/26/08< 2< 3< 5< 2< 4< 2< 4< 13< 2< 2< 23< 707/03/08 - 07/31/08< 2< 2< 5< 2< 4< 2< 4< 12< 2< 2< 21< 508/06/08 - 08/28/08< 1< 1< 3< 1< 1< 1< 2< 14< 1< 1< 18< 509/04/08 - 09/25/08< 2< 2< 4< 2< 3< 2< 3< 14< 1< 2< 22< 710/02/08 - 10/30/08< 1< 1< 3< 1< 2< 1< 2< 14< 1< 1< 42< 1111/06/08 - 11/26/08< 1< 1< 3< 1< 2< 1< 2< 7< 1< 1< 40< 1412/04/08 - 12/31/08<1<1<3<1<2<1<2<12<1<1<17<5 MEAN L-40 01/03/08 02/07/08 03/06/08 04/03/08 05/01/08 06/05/08 07/03/08 08/06/08 09/04/08 10/02/08 11/06/08 12/04/08 01/31/08<2<2<4<1<3<2<3<14<1<1<21<7 02/28/08<3<3<8<3<6<4<6<14<3<3<30<9 03/27/08<3<3<6<3<6<4<7<13<3<3<29<8 04/24/08<3<3<7<3<5<3<6<15<3<3<25<9 05/29/08<2<2<4<2<4<2<4<11<2<2<18<5 06/26/08<2<2<5<2<4<3<4<14<2<2<23<7 07/31/08<2<2<4<1<3<2<3<10<1<2<16<5 08/28/08<1<1<3<1<2<1<2<15<1<1<19<6 09/25/08<1<1<3<1<2<1<2<12<1<1<16<5 10/30/08<1<1<2<1<2<1<2<15<1<1<40<11 11/26/08< 1< 1<3< 1< 1< 1<2<7< 1< 1<41< 14 12/31/08< 1< 1<3< 1<2< 1<2< 11< 1< 1< 15<5 MEAN TABLE C-I1.1CONCENTRATIONS OF TRITIUM IN GROUND

/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTIONL-27L-28-W4*L-28-W5*L-28-W6 PERIOD 01/10/08 - 01/10/08< 153< 152< 152 04/03/08 - 04/03/08< 167< 166< 168 07/10/08 - 07/10/08< 176< 179< 177 10/16/08 - 10/16/08< 171< 169< 171 MEAN THERE ARE THREE WELLS ASSOCIATED WITH LOCATION L-28 C-344 of 190 TABLE C-II.2CONCENTRATIONS OF GAMMA EMITTERS IN GROUND

/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-2701/10/08 - 01/10/08< 4< 3< 7< 4< 7< 4< 6< 3< 4< 21< 604/03/08 - 04/03/08< 6< 5< 14< 6< 13< 7< 10< 5< 6< 31< 1107/10/08 - 07/10/08< 3< 3< 8< 4< 7< 4< 6< 3< 4< 28< 1010/08/08 - 10/08/08< 1< 1< 3< 1< 2< 1< 2< 1< 1< 20< 6 MEAN< 5< 4< 11< 6< 10< 5< 8< 5< 5< 27< 1007/10/08 - 07/10/08< 3< 3< 7< 3< 6< 4< 6< 3< 3< 28< 810/16/08 - 10116/08< 1< 2< 3< 1< 3< 2< 3< 1< 1< 16< 6 MEAN-----------L-28-W5*04/03/08 - 04/03/08< 7< 7< 15< 6< 13< 7< 12< 6< 7< 38< 12 MEAN-----------L-28-W6*01/10/08 - 01/10/08< 4< 5< 10< 4< 9< 5< 8< 4< 4< 26< 904/03/08 - 04/03/08< 8< 8< 15< 8< 14< 8< 13< 6< 8< 32< 1207/10/08 - 07/10/08< 4< 4< 9< 4< 7< 4< 7< 3< 4< 29< 1010/16/08 - 10/16/08< 1< 1< 4< 1< 3< 2< 3< 1< 2< 18< 5 MEAN*THERE ARE THREE WELLS ASSOCIATED WITH LOCATION L-28 TABLE C-111.1CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PC/KG WET +/- 2 SIGMA STC COLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-34 Channel Catfish05/21/08< 41< 59< 117< 51< 115< 68< 91< 38< 49< 1120< 459 Largemouth Bass 05/21/08< 23< 40< 107< 34< 87< 48< 79< 30< 27< 1050< 283 Channel Catfish10/15/08< 36< 42< 118< 43< 81< 45< 75< 36< 32< 675< 189 Largemouth Bass10/15/08< 41< 53< 129< 37< 87< 51< 91< 41< 46< 963< 206 MEAN L-35 Channel Catfish05/22/08< 36< 47< 100< 48< 81< 49< 80< 31< 33< 927< 233 Smallmouth Buffalo 05/22/08< 42< 60< 128< 35< 93< 66< 88< 38< 39< 1050< 336 Freshwater Drum10/16/08< 62< 70< 200< 64< 139< 76< 131< 57< 58< 1300< 374 Smallmouth Buffalo 10/16/08< 37< 47< 114< 31< 94< 52< 83< 36< 37< 879< 255 MEAN L-36 Channel Catfish05/22/08< 55< 59< 160< 50< 117< 64< 105< 42< 46< 1270< 647 Smallmouth Buffalo 05/22/08< 38< 58< 94< 44< 85< 53< 91< 39< 39< 1150< 249 Largemouth Bass10/16/08< 47< 40< 124< 41< 70< 48< 85< 39< 46< 913< 245 Smallmouth Buffalo 10/16/08< 47< 49< 113< 41< 91< 52< 93< 35< 44< 1040< 325 MEANa1 O h TABLE C-IV.1CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PC/KG DRY +/- 2 SIGMA STC COLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD< 59< 79< 211< 59< 149< 87< 153< 53< 79< 1560< 45310/02/08< 46< 47< 139< 42< 94< 61< 112< 38< 42< 845< 254 MEANL-40 05/15/08< 65< 65< 136< 69< 152< 79< 124< 56< 74< 516< 9610/02/08< 49< 61< 156< 41< 106< 69< 117< 47< 70< 1050< 328 MEANL-41 05/15/08< 69< 62< 179< 66< 134< 82< 137< 5977 +/- 67 < 567< 12910/02/08< 63< 71< 211< 60< 165< 99< 138< 5383 +/- 48 < 1260< 338 MEAN--------80 +/- 8 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES TABLE C-V.1CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMAGROUP IIGROUP II1GROUP IIII GROUP IV PERIODL-03L-05L-01L-06L-04L-07L-08L-11L-1001/03/08 01/10/08 01/17/08 01/24/0801/31/0802/07/08 02/14/08 02/21/0802/28/0803/06/08 03/13/08 03/20/0803/27/0804/03/08 04/09/08 04/17/08 04/24/08 05/01/08 05/07/08 05/15/08 05/22/08 05/29/0806/05/0806/12/08 06/19/08 06/26/08 07/03/08 07/10/0807/17/0807/24/08 07/31/08 08/06/08 08/13/08 08/21/08 08/28/0809/04/08 09/11/0809/18/08 09/25/08 10/02/08 10/08/08 10/16/08 10/23/0810/30/08 11/06/08 11/13/08 11/20/08 11/26/08 12/04/08 12/11/08 12/18/08 12/24/08 01/10/0819 +/-422+/-418 +/-417 +/-419 +/-411+/-420+/-419 +/-421-7 17 01/17/0832 +/- 530 +/- 526 +/- 529 +/- 532 +/- 536 +/- 636 +/- 536 +/- 536 +/- 6 01/24/0828 +/- 529 +/- 535 +/- 529 +/- 524 +/- 527 +/- 526 +/- 529 +/- 531 +/- 5 01/31/0824 +/- 531+/- 532 +/- 530 +/- 532 +/- 537 +/- 532 +/- 530 +/- 536 +/- 5 02/07/0816+/-414+/-414 +/-415+/-417 +/-413+/-418+/-416+/-416+/-4 02/14/0833 +/- 533 +/- 525 +/- 534 +/- 527 +/- 535 +/- 538 +/- 632 +/- 533 +/- 5 02/21/0822 +/- 524 +/- 526 +/- 522 +/- 524 +/- 519 +/- 524 +/- 522 +/- 524 +/- 5 02/28/0815 +/- 416 +/- 413 +/- 416 +/- 413 +/- 412 +/- 414 +/- 414 +/- 415 +/-4 03/06/0819 +/- 421 +/- 523 +/- 523 +/- 521+/- 519 +/- 421 +/- 524 +/- 521 +/- 5 03/13/0825 +/- 527 +/- 527 +/- 527 +/- 525 +/- 526 +/- 529 +/- 527 +/- 526 +/- 5 03/20/0815+/- 414 +/-412 +/- 416 +/-418 +/- 412 +/-416 +/-415 +/-415 +/- 4 03/27/0813+/- 414 +/-417 +/- 417 +/-418 +/- 414 +/-417 +/-414 +/-417 +/- 4 04/03/0814 +/- 412 +/- 48 +/- 316 +/- 414 +/- 411+/- 410 +/- 413 +/- 413 +/-4 04/09/0813+/- 417 +/-523 +/- 513 +/-417 +/- 418 +/-520 +/-517 +/-417 +/-4 04/17/089 +/- 311+/- 310 +/- 313 +/- 410 +/- 311+/- 310 +/- 310 +/- 313 +/-4 04/24/0817 +/- 420 +/- 423 +/- 517 +/- 418 +/- 424 +/- 522 +/- 418 +/- 417 +/- 4 05/01/0817 +/- 520 +/- 718 +/- 517 +/- 516 +/- 424 +/- 519 +/- 522 +/- 516 +/- 4 05/07/0818 +/- 4(1)22 +/- 520 +/- 521+/- 522 +/- 519 +/- 417 +/- 421 +/- 5 05/15/088 +/- 3(1)10 +/- 49 +/- 413 +/- 411+/- 412 +/- 49 +/-38 +/-4 05/22/0812 +/- 412 +/- 413 +/- 410 +/- 412 +/- 411+/- 413 +/- 411+/- 411+/- 4 05/29/08<57+/-4<56+/-46 +/-46+/-46+/-47+/-46+/-4 06/05/0814 +/- 416 +/-415 +/- 414 +/-416 +/- 413 +/-413 +/-421 +/-519 +/-4 06/12/0813 +/- 414 +/-412 +/- 415 +/-49 +/- 49 +/-414 +/-411+/-413 +/-4 06/19/0814 +/- 414 +/-414 +/- 414 +/-415 +/- 413 +/-414 +/-414 +/-413 +/-4 06/26/0815 +/- 414 +/-415 +/- 416 +/-413 +/- 417 +/-419 +/-418 +/-513 +/- 4 07/03/0819 +/- 413 +/-414 +/- 415 +/-416 +/- 415 +/-415 +/-417 +/-415 +/-4 07/10/0812 +/- 412 +/-412 +/- 411+/-410 +/- 410 +/- 414 +/-414 +/-413 +/-4 07/17/0817+/- 418 +/-417 +/- 517 +/-419 +/- 422 +/- 519 +/-420 +/-417 +/- 4 07/24/0817 +/- 418 +/-417 +/- 418 +/- 420 +/- 520 +/- 523 +/- 522 +/- 518 +/- 4 07/31/0820 +/- 417 +/- 421+/- 419 +/- 418 +/- 416 +/- 422 +/- 423 +/- 518 +/- 4 08/06/0818 +/- 423 +/- 519 +/- 421 +/- 521+/- 525 +/- 526 +/- 520 +/- 525 +/- 5 08/13/0814 +/- 416 +/- 420 +/- 415 +/- 417 +/- 418 +/- 415 +/- 417 +/- 415 +/-4 08/21/0823 +/- 424 +/- 529 +/- 521 +/- 428 +/- 525 +/- 531 +/- 524 +/- 525 +/- 5 08/28/0823 +/- 419 +/- 419 +/- 422 +/- 418 +/- 423 +/- 419 +/- 423 +/- 421 +/- 4 09/04/0830 +/- 525 +/- 529 +/- 530 +/- 535 +/- 535 +/- 534 +/- 538 +/- 632 +/- 5 09/11/0816 +/- 417 +/- 423 +/- 519 +/- 419 +/- 415 +/- 416 +/- 417 +/- 413 +/- 4 09/18/08 < 39(1)12 +/- 413 +/- 413 +/- 411+/- 413 +/- 412 +/- 412 +/- 412 +/- 4 09/25/0843 +/- 645 +/- 638 +/- 638 +/- 645 +/- 643 +/- 638 +/- 644 +/- 638 +/- 6 10/02/0836 +/- 529 +/- 527 +/- 529 +/- 538 +/- 531 +/- 532 +/- 532 +/- 531 +/- 5 10/08/0822 +/- 521+/- 527 +/- 523 +/- 521+/- 517 +/- 519 +/- 515 +/- 426 +/- 5 10/16/0819 +/- 420 +/- 423 +/- 423 +/- 423 +/- 419 +/- 420 +/- 421 +/- 420 +/- 4 10/23/0812 +/- 415 +/- 413 +/- 412 +/- 416 +/- 414 +/- 413 +/- 417 +/- 414 +/-4 10/30/0818 +/- 513 +/- 413 +/- 415 +/- 515 +/- 419 +/- 518 +/- 514 +/- 518 +/- 5 11/06/0834 +/- 532 +/- 536 +/- 538 +/- 641+/- 637 +/- 542 +/- 636 +/- 541 +/- 6 11/13/0815 +/- 417 +/- 414 +/- 417 +/- 410 +/- 416 +/- 414 +/- 414 +/- 416 +/- 4 11/20/0816 +/- 418 +/- 415 +/- 421 +/- 422 +/- 422 +/- 522 +/- 420 +/- 421 +/- 4 11/26/0817 +/- 518 +/- 521+/- 523 +/- 519 +/- 522 +/- 516 +/- 523 +/- 517 +/- 5 12/04/0821 +/- 418 +/-419 +/- 415 +/-417 +/- 417 +/-416 +/-418 +/-419 +/-4 12/11/0824 +/- 526 +/- 523 +/- 519 +/- 521+/- 521 +/- 524 +/- 522 +/- 521 +/- 5 12/18/0829 +/- 530 +/- 528 +/- 532 +/- 531+/- 529 +/- 531+/- 530 +/- 527 +/- 5 12/24/0822 +/- 535 +/- 623 +/- 530 +/- 527 +/- 532 +/- 627 +/- 528 +/- 522 +/- 5 12/31/0833 +/- 542 +/- 634 +/- 530 +/- 530 +/- 537 +/- 537 +/- 5 < 37 (1)32 +/- 5 MEAN20 +/- 1520 +/- 1620 +/- 1520 +/- 1520 +/- 1621 +/- 1821 +/- 1721 +/- 1620 +/- 16 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1)SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-748 of 190 TABLE C-V.2MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - NEAR-SITE LOCATIONSGROUP II - FAR-FIELD LOCATIONSGROUP III - FAR-FIELD LOCATIONSGROUP IV - CONTROL LOCATION COLLECTIONMIN MAX MEAN

+/-COLLECTIONMIN MAX MEAN

+/-COLLECTIONMIN MAX MEAN

+/-COLLECTIONMIN MAX MEAN +/-

PERIOD2SDPERIOD2SDPERIOD2SDPERIOD2SD 01/03/08 01/31/08 02/28/08 04/03/08 05/01/08 05/29/08 07/03/08 07/31/08 C^ 08/28/08 00 10/02/08 10/30/08 12/04/08 01 /31 /0819 3227 +/- 9 02/28/0814 3321 +/- 16 04/03/0812 2717 +/- 11 05/01/0892015 +/- 8 05/29/08< 51811 +/- 8 07/03/0813 1914 +/- 4 07/31/0812 2016 +/- 6 08/28/0814 2420 +/- 8 10/02/08< 39 4528 +/- 23 10/30/0812 2217 +/- 8 12/04/0815 3421 +/- 14 12/31/0822 4230 +/- 13 01/03/08 01/31/08 02/28/08 04/03/08 05/01/08 05/29/08 07/03/08 07/31/08 08/28/08 10/02/08 10/30/08 12/04/08 01/31/0817 3527 +/- 13 02/28/0813 3421 +/- 15 04/03/0882719 +/- 12 05/01/0810 2317 +/- 9 05/29/08< 52213 +/- 12 07/03/0812 1614 +/- 2 07/31/08112116 +/- 7 08/28/0815 2921 +/- 8 10/02/0813 3826 +/- 18 10/30/0812 2719 +/- 12 12/04/0814 3822 +/- 17 12/31/0819 3427 +/- 10 01/03/08 01/31/08 02/28/08 04/03/08 05/01/08 05/29/0807/03/08 07/31/08 08/28/08 10/02/08 10/30/08 12/04/08 01/31/081137 02/28/0812 38 04/03/0810 29 05/01/0810 24 05/29/08622 07/03/08921 07/31/0810 23 08/28/0815 31 10/02/081145 10/30/0813 23 12/04/0810 42 12/31/08< 3737 28 +/- 1501/03/08 21 +/- 1601/31/08 18 +/- 1102/28/08 17 +/- 1004/03/08 12 +/- 1005/01/08 15 +/- 605/29/08 18 +/- 907/03/08 22 +/- 907/31/08 28 +/- 2408/28/08 18 +/- 610/02/08 22 +/- 1910/30/08 29 +/- 1012/04/08 01/31/08213631 +/- 14 02/28/0815 3322 +/- 17 04/03/0813 2619 +/- 10 05/01/08131716 +/- 4 05/29/0862111+/- 13 07/03/0813 1914 +/- 6 07/31/0813 1816 +/- 4 08/28/0815 2522 +/- 9 10/02/0812 3825 +/- 24 10/30/0814 2619 +/- 10 12/04/0816 4123 +/- 21 12/31/08213226 +/- 11 01/03/08 - 12/31/08 < 54520 +/- 1601/03/08 - 12/31/08 < 53820 +/- 1501/03/08 - 12/31/08 < 37 4521 +/- 1701/03/08 - 12/31/0864120 +/- 16 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES TABLE C-V.3CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134 Cs-137Ba-140La-140 PERIOD< 3< 5< 14< 1< 6< 6< 9< 3< 2< 583< 18404/03/08 - 07/03/08< 3< 5< 19< 3< 8< 6< 11< 2< 2< 797< 27007/03/08 - 10/02/08< 5< 12< 92< 3< 13< 14< 26< 4< 3< 58800< 1450010/02/08 - 12/31/08< 4< 4< 22< 3< 10< 6< 10< 3< 3< 578< 175 MEANL-03 01/03/08 - 04/03/08< 4< 6< 11< 4< 11< 7< 13< 3< 3< 921< 33604/03/08 - 07/03/08< 3< 6< 19< 3< 7< 7< 8< 3< 2< 685< 26907/03/08 - 10/02/08< 3< 10< 51< 3< 9< 12< 25< 2< 2< 43700< 2110010/02/08 - 12/31/08< 3< 5< 15< 3< 6< 4< 7< 3< 2< 458< 97 MEANL-04 01/03/08 - 04/03/08< 3< 5< 12< 2< 8< 5< 9< 3< 3< 521< 24004/03/08 - 07/03/08< 3< 6< 21< 2< 10< 7< 12< 4< 3< 782< 45107/03/08 - 10/02/08< 4< 11< 71< 2< 8< 19< 27< 4< 2< 69600< 2020010/02/08 - 12/31/08< 2< 5< 14< 2< 7< 4< 6< 2< 2< 417< 68 MEANL-05 01/03/08 - 04/03/08< 2< 6< 21< 5< 8< 8< 11< 3< 3< 854< 26004/03/08 - 07/03/08< 3< 6< 13< 3< 8< 6< 8< 4< 2< 835< 50407/03/08 - 10/02/08< 4< 12< 39< 3< 8< 14< 26< 3< 3< 52900< 2160010/02/08 - 12/31/08< 3< 6< 16< 4< 7< 6< 10< 3< 3< 615< 200 MEAN TABLE C-V.3CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134 Cs-137 Ba-140La-140 PERIOD< 3< 5< 19< 3< 7< 6< 9< 3< 3< 619< 26804/03/08 - 07/03/08< 4< 7< 23< 4< 12< 9< 13< 4< 4< 853< 36207/03/08 - 10/02/08< 4< 13< 61< 3< 7< 16< 16< 3< 2< 43500< 2410010/02/08 - 12/31/08< 3< 4< 16< 2< 5< 5< 8< 3< 3< 420< 159 MEANL-07 01/03/08 - 04/03/08< 2< 4< 16< 2< 5< 4< 8< 3< 2< 493< 19404/03/08 - 07/03/08< 4< 6< 18< 2< 6< 7< 12< 4< 2< 983< 35207/03/08 - 10/02/08< 5< 16< 87< 3< 11< 18< 28< 3< 3< 73400< 2360010/02/08 - 12/31/08< 3< 5< 18< 3< 6< 6< 11< 3< 3< 472< 156 MEANL-08 01/03/08 - 04/03/08< 4< 6< 23< 3< 11< 5< 12< 3< 4< 760< 36404/03/08 - 07/03/08< 2< 5< 17< 2< 6< 6< 10< 3< 2< 745< 28007/03/08 - 10/02/08< 3< 12< 68< 4< 11< 15< 19< 3< 2< 44000< 2950010/02/08 - 12/31/08< 3< 4< 10< 3< 4< 4< 7< 2< 2< 355< 120 MEANL-10 01/03/08 - 04/03/08< 3< 4< 14< 3< 8< 5< 8< 2< 2< 561< 22504/03/08 - 07/03/08< 4< 6< 21< 3< 8< 8< 12< 3< 3< 940< 44407/03/08 - 10/02/08< 4< 15< 70< 2< 11< 18< 31< 4< 3< 73300< 2550010/02/08 - 12/31/08< 3< 5< 23< 3< 6< 6< 11< 3< 4< 463< 178 MEAN TABLE C-V.3CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134 Cs-137 Ba-140La-140 PERIOD< 3< 8< 19< 3< 9< 7< 12< 3< 3< 935< 37904/03/08 - 07/03/08< 3< 7< 16< 3< 9< 6< 11< 3< 3< 857< 35207/03/08 10/02/08< 2< 10< 50< 3< 7< 10< 19< 2< 2< 47900< 1800010/02/08 - 12/31/08< 3< 5< 13< 3< 8< 5< 8< 3< 3< 363< 136 MEAN TABLE C-VI.1CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA I COLLECTIONGROUP I PERIODL-03L-05 GROUP II1GROUP IIII GROUP IV L-01L-06L-04L-07L-08L-11L-10 (1)01/03/08 - 01/10/08

< 6601/10/08 - 01/17/08

< 50 01/17/08 - 01/24/08

< 28 01/24/08 - 01/31/08

< 61 01/31/08 - 02/07/08

< 52 02/07/08 - 02/14/08

< 38 02/14/08 - 02/21/08

< 21 02/21/08 - 02/28/08

< 32 02/28/08 - 03/06/08

< 3603/06/08 - 03/13/08

< 30 03/13/08 - 03/20/08

< 48 03/20/08 - 03/27/08

< 63 03/27/08 - 04/03/08

< 27 04/03/08 - 04/09/08

< 56 04/09/08 - 04/17/08

< 53 04/17/08 - 04/24/08

< 23 04/24/08 - 05/01/08

< 36 05/01/08 - 05/07/08

< 52 05/07/08 - 05/15/08

< 43 05/15/08 - 05/22/08

< 46 05/22/08 - 05/29/08

< 43 05/29/08 - 06/05/08

< 69 06/05/08 - 06/12/08

< 14 06/12/08 - 06/19/08

< 69 06/19/08 - 06/26/08

< 44 06/26/08 - 07/03/08

< 62 07/03/08 - 07/10/08

< 56 07/10/08 - 07/17/08

< 63 07/17/08 - 07/24/08

< 16 07/24/08 - 07/31/08

< 41 07/31/08 - 08/06/08

< 66 08/06/08 - 08/13/08

< 61 08/13/08 - 08/21/08

< 35 08/21/08 - 08/28/08

< 6608/28/08 - 09/04/08

< 60 09/04/08 - 09/11/08

< 54 09/11/08 - 09/18/08

< 362 09/18/08 - 09/25/08

< 54 09/25/08 - 10/02/08

< 67 10/02/08 - 10/08/08

< 69 10/08/08 - 10/16/08

< 57 10/16/08 - 10/23/08

< 67 10/23/08 - 10/30/08

< 39 10/30/08 - 11/06/08

< 69 11/06/08 - 11/13/08

< 64 11/13/08 - 11/20/08

< 6511/20/08 - 11/26/08

< 60 11/26/08 - 12/04/08

< 6812/04/08 - 12/11/08

< 6812/11/08 - 12/18/08

< 70 12/18/08 - 12/24/08

< 53 12/24/08 - 12/31/08

< 43 MEAN< 65< 36< 65< 67< 54< 56< 53< 53<50<34<51<51<62<62<60<62<27<14<28<28<25<25<24<25< 59< 34< 61< 61< 61< 61< 59< 61< 52< 31< 52< 52< 60< 60< 60< 60< 37< 23< 38< 38< 48< 48< 48< 48<36<35<35<35<31<31<31<31< 33< 20< 32< 31< 43< 43< 42< 43< 36< 36< 34< 21< 47< 47< 46< 46< 30< 15< 30< 30< 24< 24< 24< 24<46<48<29<48<43<42<42<42<64<35<63<63<67<67<65<67<16<26<26<27<30<30<30<30<57<34<57<57<65<65<65<65<54<55<62<54<34<63<63<63<24<13<23<24<61<61<60<61< 62< 19< 34< 34< 58< 58< 57< 57 (1)< 51< 48< 51< 50< 32< 47< 48 (1)< 34< 44< 43< 52< 51< 49< 51< 45< 29< 47< 47< 44< 44< 44< 44< 43< 18< 43< 43< 25< 25< 25< 25<69<40<70<70<65<64<66<66< 14< 8< 14< 14< 16< 16< 16< 16< 70< 38< 70< 68< 64< 60< 62< 62< 44< 26< 43< 45< 33< 33< 34< 33< 61< 37< 61< 61< 66< 68< 68< 68< 56< 30< 56< 56< 35< 35< 35< 35< 63< 34< 63< 63< 51< 51< 49< 50<17<11<16<16<20<19<19<20<40<24<40<40<51<50<50<52<66<28<66<65<63<61<61<61<62<34<62<61<48<48<48<48< 36< 20< 35< 36< 39< 38< 38< 38< 67< 42< 67< 65< 66< 66< 65< 65< 62< 37< 63< 61< 50< 50< 49< 49< 54< 29< 54< 52< 33< 33< 32< 32< 51< 52< 22< 52< 41< 41< 41< 41< 55< 30< 55< 55< 60< 60< 59< 59<67<41<66<66<56<57<57<57<69<38<69<69<61<62<60<60<56<31<57<56<56<56<54<54<67<67<63<37<53<50<53<53<39<21<39<39<64<63<64<64<70<38<69<68<68<68<68<68<65<35<64<64<67<69<69<69< 66< 39< 66< 62< 54< 54< 54< 54< 60< 40< 60< 60< 57< 57< 57< 57< 68< 54< 68< 68< 68< 67< 67< 67< 69< 35< 69< 69< 67< 66< 66< 66<70<46<70<70<61<61<60<60< 52< 29< 52< 53< 55< 54< 54< 58< 45< 25< 45< 45< 42< 42< 384 (1)< 42 (1)SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-1253 of 190 TABLE C-VII.1CONCENTRATIONS OF 1-131 IN MILK SAMPLES IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM COLLECTIONL-42 PERIOD 01/03/08< 0.6 02/01/08< 0.8 03/06/08< 0.5 04/03/08< 0.8 05/01/08< 0.7 05/15/08< 0.7 05/29/08< 0.8 06/12/08< 0.7 06/26/08< 0.7 07/10/08< 0.7 07/24/08< 0.7 08/06/08< 0.8 08/21/08< 0.8 09/04/08< 0.7 09/18/08< 0.9 10/02/08< 0.8 10/16/08< 0.8 10/30/08< 0.9 11/13/08< 0.7 12/04/08< 0.9 MEAN C-1354 of 190 U O O TABLE C-VII.2CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD<7<7<13<7<18<9<14<6<9<31<1002/01/08<5<5<12<7<13<6<10<5<6<34<1203/06/08<5<5<12<6<12<6<7<5<6<26<904/03/08<5<5<12<5<13<5<8<5<5<24<805/01/08<6<7<16<8<17<7<12<8<7<43<1105/15/08<7<7<15<6<15<6<12<6<6<37<1305/29/08<4<5<11<4<10<5<9<5<5<34<906/12/08<6<7<16<6<16<6<12<6<6<40<1206/26/08< 4< 5< 11< 5< 11< 5< 9< 4< 5< 33< 1007/10/08<7<7<16<6<17<7<14<6<7<37<1307/24/08<3<3<8<3<6<4<6<3<3<43<1008/06/08<7<7<17<6<16<6<13<5<7<46<908/21/08<4<4<9<5<9<5<8<3<4<24<609/04/08<6<7<17<6<12<7<13<5<6<52<1509/18/08<5<5<14<4<11<6<9<4<4<46<1210/02/08<2<3<8<2<5<3<6<2<2<51<1410/16/08<4<5<10<5<10<5<9<4<5<44<1310/30/08<2<2<6<2<3<2<4<1<2<46<1511/13/08<1<2<5<1<3<2<3<1<1<47<1312/04/08<6<6<14<5<11<6<9<5<5<31<4 MEAN TABLE C-VIII.1CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA STCCOLLECTION Mn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-951-131Cs-134Cs-137Ba-140La-140 PERIOD L-CONTROL Cabbage09/13/08< 8< 8< 20< 7< 19< 9< 14< 29< 7< 8< 58< 18 Carrots09/13/08< 16< 18< 41< 17< 32< 15< 31< 59< 13< 14< 116< 41 MEAN L-QUAD 1 Cabbage09/11/08< 9< 9< 28< 9< 21< 10< 17< 37< 8< 9< 74< 19 Onions09/11/08< 12< 11< 30< 12< 26< 14< 23< 51< 10< 11< 110< 32 MEAN L-QUAD 2 Cabbage09/11/08< 10< 10< 28< 9< 21< 11< 21< 54< 10< 10< 102< 27 Onions09/11/08< 10< 11< 28< 13< 26< 14< 23< 49< 10< 12< 100< 35 MEAN L-QUAD 3 Beet greens 09/11/08< 12< 12< 33< 11< 27< 14< 23< 58< 10< 13< 107< 26 Beets09/11/08< 9< 11< 28< 9< 23< 10< 21< 44< 9< 11< 79< 20 MEAN L-QUAD 4 Cabbage09/13/08< 7< 8< 21< 8< 20< 9< 13< 29< 6< 8< 58< 16 Onions09/13/08< 8< 10< 23< 10< 18< 11< 17< 41< 8< 9< 71< 21 MEAN TABLE C-IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATIONMEANJAN - MARAPR - JUNJUL - SEPOCT -DEC CODE+/- 2 S.D.L-01-124.5 +/- 5.325222328 L-01-224.5 +/- 3.525222526 L-03-124.0 +/- 6.325222128 L-03-224.0 +/- 4.926212326 L-04-124.5 +/- 6.825212329 L-04-223.0 +/- 5.923202227 L-05-123.0 +/- 4.924212126 L-05-223.8 +/- 7.927221927 L-06-125.5 +/- 3.525242528 L-06-224.3 +/- 4.425232227 L-07-125.5 +/- 6.225242330 L-07-223.0 +/- 5.926202125 L-08-123.3 +/- 4.125212225 L-08-223.8 +/- 1.924232325 L-10-121.5 +/- 3.823211923 L-10-220.8 +/- 5.021182024 L-11-122.5 +/- 4.223202225 L-11-221.0 +/- 4.321192024 L-101-124.8 +/- 4.426222427 L-101-225.5 +/- 5.326242329 L-102-126.0 +/- 6.327232430 L-102-227.0 +/- 7.526232732 L-103-124.5 +/- 4.224222527 L-103-226.8 +/- 7.025252532 L-104-124.0 +/- 5.225232127 L-104-223.5 +/- 3.824222226 L-105-126.3 +/- 8.727222432 L-105-225.0 +/- 4.325232428 L-106-124.5 +/- 4.225242227 L-106-224.0 +/- 5.32322(1)27 L-107-124.5 +/- 5.024222428 L-107-225.3 +/- 3.426252327 L-108-125.0 +/- 8.625232131 L-108-221.0 +/- 5.721191925 L-109-125.8 +/- 3.025272427 L-109-227.0 +/- 5.727252531 L-110-125.0 +/- 3.325232527 L-110-225.5 +/- 5.826222529 L-112-124.3 +/- 6.626212228 L-112-226.8 +/- 4.429262428 L-114-126.3 +/- 7.925232532 L-114-224.0 +/- 4.324232227 L-115-123.3 +/- 5.724212127 L-115-222.5 +/- 6.021212127 L-116-123.8 +/- 6.023202527 L-116-224.5 +/- 5.325222328 (1)SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-1657 of 190 TABLE C-IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATIONMEANJAN - MARAPR - JUNJUL - SEPOCT - DEC CODE+/- 2 S.D.L-201-322.3 +/- 6.023192126 L-201-424.5 +/- 3.825232327 L-202-323.5 +/- 4.224232126 L-202-422.0 +/- 7.124191926 L-203-124.0 +/- 1.624242325 L-203-224.3 +/- 3.824232327 L-204-124.8 +/- 5.024222528 L-204-225.3 +/- 5.325232429 L-205-125.5 +/- 2.025252527 L-205-225.8 +/- 5.728222528 L-205-324.5 +/- 5.024222428 L-205-424.5 +/- 8.923232131 L-206-125.8 +/- 7.724222631 L-206-225.0 +/- 7.128232128 L-207-125.3 +/- 5.328232327 L-207-224.0 +/- 4.324222327 L-208-124.0 +/- 4.324222327 L-208-225.5 +/- 2.025252527 L-209-124.8 +/- 6.625242129 L-209-225.0 +/- 3.325252327 L-210-126.5 +/- 6.226252431 L-210-225.5 +/- 5.025232529 L-211-126.8 +/- 7.729232431 L-211-225.5 +/- 3.528252524 L-212-125.0 +/- 3.727232426 L-212-225.3 +/- 5.325232429 L-213-323.5 +/- 3.824222226 L-213-423.3 +/- 3.424212325 L-214-323.8 +/- 3.424222326 L-214-424.5 +/- 5.328222325 L-215-325.3 +/- 5.325232429 L-215-424.8 +/- 5.526222328 L-216-324.8 +/- 3.026232426 L-216-424.0 +/- 5.227212325 L-111 B-125.5 +/- 3.827232527 L-111 B-226.8 +/- 2.525272728 L-113A-124.8 +/- 2.525232526 L-113A-225.0 +/- 5.925222429 C-1758 of 190 TABLE C-IX.2MEAN QUARTERLY TLD RESULTS FOR THE INNER RING, OUTER RING, OTHER AND CONTROL LOCATIONS FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTIONINNER RINGOUTER RINGOTHERCONTROL PERIOD+/- 2 S.D.JAN-MAR25.0 +/- 3.325.3 +/- 3.324.6 +/- 2.822.0 +/- 2.8 APR-JUN22.9 +/- 3.622.7 +/- 2.921.6 +/- 2.919.5 +/- 4.2 JUL-SEP23.6 +/- 3.723.2 +/- 3.022.2 +/- 3.219.5 +/- 1.4 OCT-DEC28.2 +/- 3.927.4 +/- 3.826.6 +/- 3.323.5 +/- 1.4 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATION SAMPLES PERIOD PERIODPERIOD MEAN ANALYZED MINIMUM MAXIMUM+/- 2 S.D.INNER RING127193224.9 +/- 5.5 OUTER RING136193124.7 +/- 4.9 OTHER64193023.8 +/- 5.1 CONTROL8182421.1 +/- 4.2 INNER RING STATIONS - L-101-1, L-101-2, L-102-1, L-102-2, L-103-1, L-103-2, L-104-1, L-104-2, L-105-1, L-105-2, L-106-1, L-106-2, L-107-1, L-107-2, L-108-1, L-108-2, L-109-1, L-109-2, L-110-1, L-110-2, L-111 B-1, L-111 B-2, L-112-1, L-112-2, L-113A-1, L-113A-2, L-114-1, L-114-2, L-115-1, L-115-2, L-116-1, L-116-2 OUTER RING STATIONS - L-201-3, L-201-4, L-202-3, L-202-4, L-203-1, L-203-2, L-204-1, L-204-2, L-205-1, L-205-2, L-205-3, L-205-4, L-206-1, L-206-2, L-207-1, L-207-2, L-208-1, L-208-2, L-209-1, L-209-2, L-210-1, L-210-2, L-211-1, L-211-2, L-212-1, L-212-2, L-213-3, L-213-4, L-214-3, L-214-4, L-215-3, L-215-4, L-216-3, L-216-4 OTHER STATIONS - L-01-1, L-01-2, L-03-1, L-03-2, L-04-1, L-04-2, L-05-1, L-05-2, L-06-1, L-06-2, L-07-1, L-07-2, L-08-1, L-08-2, L-11-1, L-11-2 CONTROL STATIONS - L-10-1, L-10-2 C-1859 of 190 FIGURE C-1Surface Water - Gross Beta - Station L

-21 and L-40 Collected in the Vicinity of LCS, 2000 - 2004 L-21 Illinois Fiver at Seneca 1Lr4 L- 0 Illinois River Downstream C-1960 of 190 FIGURE C-1 (cont.)Surface Water - Gross Beta - Station L

-21 and L-40 Collected in the Vicinity of LCS, 2005 - 2008 L-21 Illinois River at Seneca 2.0+0.01iIIIII 01-27-0509-23-0505-20-0601-14-0709-10-0705-06-0812-31-08 L-40 Illinois River Downstream 01-27-0509-23-0505-20-0601-14-0709-10-0705-06-0812-31-08 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 FIGURE C-2Surface Water - Tritium - Station L-21 (C)and L-40 Collected in the Vicinity of LCS, 2000 - 2004 L-21 (C)Illinois River at S eneca L-40 'Illinois River Downstream C-2162 of 190 FIGURE C-2 (cont.)Surface Water - Tritium - Station L-21 (C)and L-40 Collected in the Vicinity of LCS, 2005 - 2008 L-21 Illinois River at Seneca J_U L-40 Illinois River Downstream J_U DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-2263 of 190 FIGURE C-3 Air Particulates - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LCS, 2000 - 2004 L-01 Nearsfte No. 1 U W L-03 !O n s its No. 3 o1,31.:co 12-31 -0: 12:11, 0 1 1 2-31-02 12-31-03 11-30-04 C-2364 of 190 FIGURE C-3 (cont.)Air Particulates - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LCS, 2005 - 2008 L-01 Nearsite No. 1 50.0 t k 0.0IIIIIIi 01-06-0509-06-0505-07-0601-05-0709-05-0705-05-0801-03-09 L-03 Onsite No. 3 0.0IIIIII 01-06-0509-06-0505-07-0601-05-0709-05-0705-05-0801-03-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-2465 of 190 FIGURE C-4 Air Particulates - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LCS, 2000 - 2004 L-05 Onsite No, 5 6.0 2.u L-O6 Nearsite No. 6 1 0,0 -0.0-Q1$1-G!12-31-00 12-31-01 1221;2-:t1 ^I?i3 12-<<Q-Cu C-2566 of 190 FIGURE C-4 (cont.)

Air Particulates - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LCS, 2005 - 2008 L-05 Onsite No. 5 I 0.0IIIIIIi 01-06-0509-06-0505-07-0601-05-0709-05-0705-05-0801-03-09 L-06 Nearsite No. 6 10.0+I 0.0 t 01-06-0509-06-0505-07-0601-05-0709-05-0705-05-0801-03-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-2667 of 190 FIGURE C-5 Air Particulates - Gross Beta - Station L-10 (C)Collected in the Vicinity of LCS, 2000 - 2004 L.-10 (C) Streator 10:D Q .U--I--0 1-011Cc" 1 2-1.1,012 2112 11.;13121-212-04 C-2768 of 190 FIGURE C-5 (cont.)

Air Particulates - Gross Beta - Station L-10 (C)Collected in the Vicinity of LCS, 2005 - 2008 L-10 (C)Streator 50.0 r 40.0 10.0 0.0 1 01-06-0509-06-0505-07-0601-05-0709-05-0705-05-0801-03-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-2869 of 190 FIGURE C-6 Air Particulates - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LCS, 2005 - 2008 L-04 Rte. 170 50.0 r 40.0 10.0 L-07 Seneca 50.0 -r 40.0 }1 07-07-0502-04-0609-04-0604-04-0711-02-0706-01-0812-30-08 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-2970 of 190 FIGURE C-7 Air Particulates - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LCS, 2005 - 2008 L-08 Marseilles 50.0 r 40.0 I I r I I r 0.0IIII+1I 07-07-0502-04-0609-04-0604-04-0711-02-0706-01-0812-30-08 L-11 Ransom 0.0iIIII-}07-07-0502-04-0609-04-0604-04-0711-02-0706-01-0812-30-08 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-3071 of 190 APPENDIX D INTER-LABORATORY COMPARISON PROGRAM TABLE D-1ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 3)

IdentificationReportedKnownRatio (c)Month/YearNumberMatrixNuclideUnitsValue (a)Value (b)TBE/Analytics Evaluation (d)

March 2008E5847-396MilkSr-89pCi/L83.595.80.87A Sr-90pCi/L13.912.91.08A E5848-396Milk1-131pCi/L57.360.00.96A Ce-141pCi/L2292490.92A Cr-51pCi/L3363590.94A Cs-134pCi/L1061250.85A Cs-137pCi/L1411460.97A Co-58pCi/L71.870.81.01A Mn-54pCi/L98.194.21.04A Fe-59pCi/L1021021.00A Zn-65pCi/L1351370.99A Co-60pCi/L2302360.97A E5850A-396APCe-141pCi1631571.04A Cr-51pCi2332271.03A Cs-134pCi72.679.00.92A Cs-137pCi98.392.01.07A Co-58pCi46.744.71.04A Mn-54pCi69.859.41.18A Fe-59pCi72.264.51.12A Zn-65pCi10686.41.23W Co-60pCi1561491.05A E5849-396Charcoal 1-131pCi65.560.11.09A June 2008E5971-396MilkSr-89pCi/L83.985.00.99A Sr-90pCi/L14.415.80.91A E5972-396Milk1-131pCi/L70.971.40.99A Ce-141pCi/L1571740.90A Cr-51pCi/L1591381.15A Cs-134pCi/L69.776.70.91A Cs-137pCi/L1151160.99A Co-58pCi/L59.161.90.95A Mn-54pCi/L1391351.03A Fe-59pCi/L98.491.71.07A Zn-65pCi/L1291271.02A Co-60pCi/L1011040.97A E5974-396APCe-141pCi2062071.00A Cr-51pCi1731641.05A Cs-134pCi95.991.01.05A Cs-137pCi142.0138.01.03A Co-58pCi72.073.40.98A Mn-54pCi180160.01.13A Fe-59pCi108.0109.00.99A Zn-65pCi1591501.06A Co-60pCi1291241.04A TABLE D-1ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 2 OF 3)

IdentificationReportedKnownRatio (c)Month/YearNumberMatrixNuclideUnitsValue (a)Value(b)TBE/Analytics Evaluation (d)

June 2008E5973-396Charcoal 1-131pCi73.884.10.88A September 2008 E6284

-396MilkSr-89pCi/L76.273.91.03A Sr-90pCi/L12.311.01.12A E6285-396Milk1-131pCi/L65.767.90.97A Ce-141pCi/L1451610.90A Cr-51pCi/L4064210.96A Cs-134pCi/L1962320.84A Cs-137pCi/L1471620.91A Co-58pCi/L1671790.93A Mn-54pCi/L1651660.99A Fe-59pCi/L1611441.12A Zn-65pCi/L3053190.96A Co-60pCi/L2182340.93A E6287-396APCe-141pCi79.576.31.04A Cr-51pCi2081991.05A Cs-134pCi1061100.96A Cs-137pCi79.376.71.03A Co-58pCi87.784.41.04A Mn-54pCi90.378.61.15A Fe-59pCi81.768.31.20A Zn-65pCi1441510.95A Co-60pCi1111111.00A E6286-396Charcoal1-131pCi93.290.01.04A December 2008 E6415-396MilkSr-89pCi/L98.491.91.07A Sr-90pCi/L18.012.61.43N (1)E6416-396Milk1-131pCi/L69.279.90.87A Ce-141pCi/L1771910.93A Cr-51pCi/L2312460.94A Cs-134pCi/L1171340.87A Cs-137pCi/L1191200.99A Co-58pCi/L1041041.00A Mn-54pCi/L1531521.01A Fe-59pCi/L99.61001.00A Zn-65pCi/L1771830.97A Co-60pCi/L1331331.00A E6418-396APCe-141pCi1481461.01A Cr-51pCi2021871.08A Cs-134pCi1031021.01A Cs-137pCi95.491.21.05A Co-58pCi81.479.21.03A Mn-54pCi113116.00.97A Fe-59pCi76.576.41.00A Zn-65pCi1221390.88A Co-60pCi1081011.07A D-274 of 190 TABLE D-1ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 3 OF 3)

IdentificationReportedKnownRatio (c)Month/YearNumberMatrixNuclideUnitsValue (a)Value (b)TBE/Analytics Evaluation (d)

December 2008 E6417-396Charcoal 1-131pCi65.874.10.89A (1)NCR 09-02 initiated to investigate the failure.(a)Teledyne Brown Engineering reported result.(b)The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.(c)Ratio of Teledyne Brown Engineering to Analytics results.(d)Analytics evaluation based on TBE internal QC limits: A= Acceptable. Reported result falls within ratio limits of 0.80-1.20.

W-Acceptable with warning.

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

D-375 of 190 TABLE D-2ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 1)

IdentificationReportedKnown Month/YearNumberMediaNuclideUnitsValue (a)Value (b)Control LimitsEvaluation (c)

January 2008Quiktm Response WaterSr-89pCi/L37.3319.011.8-25.2N (1)Sr-90pCi/L40.4042.731.5-49.0A Ba-133pCi/L87.890.576.2-99.6A Cs-134pCi/L80.6788.972.9-97.8A Cs-137pCi/L222.33231208 - 256A Co-60pCi/L98.9101.090.9 - 113A Zn-65pCi/L352350315 - 408A Gr-ApCi/L13.012.76.02-18.7A Gr-BpCi/L32.736.223.8-43.8A H-3pCi/L11100113009840 - 12400A January 2008RAD 72WaterSr-89pCi/L69.065.353.0-73.4A Sr-90pCi/L35.641.430.5-47.6A Ba-133pCi/L25.925.720.0-29.5A Cs-134pCi/L86.592.676.0 - 102A Cs-137pCi/L155158142 - 176A Co-60pCi/L16.014.411.4-18.7A Zn-65pCi/L214204184 - 240A Gr-ApCi/L13.314.87.15-21.2A Gr-BpCi/L21.222.513.7-30.6A 1-131pCi/L22.823.619.6-28.0A H-3pCi/L339035403000 - 3910A April 2008Rad 73WaterSr-89pCi/L65.4760.448.6-68.2A Sr-90pCi/L39.8039.228.8-45.1A Ba-133pCi/L59.6358.348.3-64.3A Cs-134pCi/L45.0046.637.4-51.3A Cs-137pCi/L97.9710291.8-115A Co-60pCi/L75.4776.668.9-86.7A Zn-65pCi/L10910695.4 - 126A Gr-ApCi/L41.0350.826.5-63.7A Gr-BpCi/L50.2051.435.0-58.4A 1-131pCi/L26.6728.723.9-33.6A H-3pCi/L116331200010400 - 13200A (1)Could find no cause for Sr-89 failure.Sample sent to outside lab for verification, but the outside laboratory was unable to confirm our numbers or ERA numbers. Studies bracketing these results, RAD 71 and RAD 72, had acceptable Sr-89 results.NCR 08-03 (a)Teledyne Brown Engineering reported result.(b)The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.(c)ERA evaluation: A=acceptable. Reported result falls within the Warning Limits. NA=not acceptable. Reported result falls outside of the Control Limits.

CE=check for Error.

Reported result falls within the Control Limits and outside of the Warning Limit.

D-476 of 190 TABLE D-3DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)TELEDYNE BROWN ENGINEERING, 2008 (PAGE 1 OF 2)

IdentificationReportedKnownAcceptance Month/YearNumber MediaNuclideUnitsValue (a)Value (b)RangeEvaluation (c)

January 200807-MaW18WaterCs-134Bq/L-0.26(1)A Cs-137Bq/L0.029(1)A Co-57Bq/L2122.816.0-29.6A Co-60Bq/L8.28.405.88-10.92A H-3Bq/L473472330 - 614A Mn-54Bq/L1212.18.5-15.7A Sr-90Bq/L10.7011.47.98- 14.82A Zn-65Bq/L15.616.311.4-21.2A 07-GrW18WaterGr-ABq/L1.41.399>0.0 - 2.798A Gr-BBq/L3.062.431.22-3.65A 07-MaS18SoilCs-134Bq/kg790854.0598-1110A Cs-137Bq/kg568545382 - 709A Co-57Bq/kg424421295 - 547A Co-60Bq/kg2.3072.9(2)A Mn-54Bq/kg611570399 - 741A K-40Bq/kg6.09571400 - 742A Sr-90Bq/kg454493.0345 - 641A Zn-65Bq/kg0.162(1)A 07-RdF18APCs-134Bq/sample2.732.52001.76-3.28A Cs-137Bq/sample2.882.71.89-3.51A Co-57Bq/sample 3.4933.552.49-4.62A Co-60Bq/sample1.3571.310.92-1.70A Mn-54Bq/sample 0.006(1)A Sr-90Bq/sample1.611.5481.084 - 2.012A Zn-65Bq/sample2.592.041.43-2.65A 07-GrF18APGr-ABq/sample 0.1310.348>0.0 - 0.696A Gr-BBq/sample 0.2610.2860.143 - 0.429A January 200807-RdV18Vegetation Cs-134Bq/sample5.256.284.40-8.16A Cs-137Bq/sample3.133.412.39-4.43A Co-57Bq/sample 6.8376.894.82-8.96A Co-60Bq/sample2.442.771.94-3.60A Mn-54Bq/sample4.454.743.32-6.16A K-40Bq/sample61.3(1)Sr-90Bq/sample1.331.2730.891 - 1.655A Zn-65Bq/sample 0.085(1)A August 200808-MaW19WaterCs-134Bq/L17.119.513.7-25.4A Cs-137Bq/L21.423.616.5-30.7A Co-57Bq/L-0.044(1)A Co-60Bq/L10.811.68.1 -15.1A H-3Bq/L334341239 - 443A Mn-54Bq/L13.013.79.6 - 17.8A Sr-90Bq/L6.556.454.52- 8.39A Zn-65Bq/L16.517.112.0-22.2A TABLE D-3DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2008 (PAGE 2 OF 2)

IdentificationReportedKnownAcceptance Month/YearNumberMediaNuclideUnitsValue (a)Value (b)RangeEvaluation (c)

August 200808-GrW19WaterGr-ABq/L0.0612<0.56 (3)A Gr-B Bq/L0.222<1.85(3)A 08-MaS19 Soil Cs-134 Cs-137 Co-57 Co-60 M n-54 K-40 Sr-90 Zn-65 08-RdF19 AP Cs-134 Cs-137 Co-57 Co-60 M n-54 Sr-90 Zn-6508-GrF19APGr-A Gr-B Bq/kg546581407 - 755A Bq/kg2.522.8(2)A Bq/kg340333233 - 433A Bq/kg157145.0102 - 189A Bq/kg460415291 -540A Bq/kg650571399 - 741A Bq/kg1.40(1)A Bq/kg-1.53(1)A Bq/sample2.462.63001.84 - 3.42A Bq/sample 0.0063(1)A Bq/sample1.361.501.05-1.95A Bq/sample 0.0143(1)A Bq/sample2.702.641.85-3.43A Bq/sample1.421.120.78-1.46WBq/sample 0.9750.940.66-1.22A Bq/sample -0

.0037(4)ABq/sample 0.5400.5250.263 - 0.788A 08-RdV19Vegetation Cs-134Bq/sample4.365.53.9-7.2W Cs-137Bq/sample-0.03(1)A Co-57Bq/sample6.727.15.0-9.2A Co-60Bq/sample4.044.703.3-6.1A Mn-54Bq/sample5.225.84.1 - 7.5A K-40Bq/sample64.4(1)Sr-90Bq/sample1.621.91.3-2.5A Zn-65Bq/sample 6.1606.94.8-9.0A (1)Not evaluated by MAPEP.

(2)Reported a statistically zero result.(3)Designed to test the Safe Drinking Water screening levels. Labs reporting values less than ref values were found to be acceptable.

(4)False positive test.(a)Teledyne Brown Engineering reported result.(b)The MAPEP known value is equal to 100%of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.(c)DOE/MAPEP evaluation: A=acceptable, W=acceptable with warning, N=not acceptable.

D-678 of 190 TABLE D-4ERA (a) STATISTICAL

SUMMARY

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

Concentration (pCi/L)LaboratoryERAControlResult cResult dLimits 467.50 +/- 5.53 1375.90 +/- 25.410.00 +/- 0.00157.60 +/- 7.70 889.90 +/- 15.90730.0523.0 1450.00.0152.0 872.0 Lab Code b DateAnalysis STAP-1143 03/24/08Co-60 STAP-1143 03/24/08Cs-134 STAP-1143 03/24/08Cs-137 STAP-1143 e 03/24/08Mn-54 STAP-1143 03/24/08Sr-90 STAP-1143 03/24/08Zn-65 Acceptance 565.0 -912.0Pass 341.0 -647.0Pass 1090.0 -1900.0Pass 0.0 -10.0Pass 66.9 - 236.0Pass 604.0 -1210.0Pass STAP-1144 03/24/08Gr. Beta 99.90 +/- 3.0992.2 56.80 - 135.0 Pass STSO-1145 03/24/08Ac-228 STSO-1145 03/24/08Bi-212 STSO-1145 03/24/08Co-60 STSO-1145 03/24/08Cs-134 STSO-1145 03/24/08Cs-137 STSO-1145 03/24/08K-40 STSO-1145 e 03/24/08Mn-54 STSO-1145 03/24/08Pb-212 STSO-1145 03/24/08Pb-214 STSO-1145 03/24/08Sr-90 STSO-1145 03/24/08Th-234 STSO-1145 03/24/08Zn-65 STVE-1146 03/24/08Co-60 STVE-1 146 03/24/08Cs-134 STVE-1146 03/24/08Cs-137 STVE-1146 03/24/08K-40 STVE-1 146 e 03/24/08Mn-54 STVE-1146 03/24/08Sr-90 STVE-1146 03/24/08Zn-65 STW-114703/24/08Co-60 STW-114703/24/08Cs-134 STW-114703/24/08Cs-137 STW-1 147 e 03/24/08Mn-54 STW-114703/24/08Sr-90 STW-114703/24/08Zn-65 STW-112003/19/07Zn-65 1269.02 +/- 36.811180.0 1407.10 +/- 56.641360.0 5219.70 +/- 90.305130.0 5427.30 +/- 102.945640.0 6346.60 +/- 201.806010.0 11052.70 +/- 181.8011000.00.00 +/- 0.000.0 1198.20 +/- 96.581080.0 2253.30 +/- 291.602020.0 6407.00 +/- 277.005360.0 2421.80 +/- 321.002030.0 2936.20 +/- 73.502660.0 912.41 +/- 13.59888.0 1547.70 +/- 38.811540.0 1163.80 +/- 20.621100.022186.00 +/- 339.40 24600.00.00 +/- 0.000.0 3825.90 +/- 140.664130.0 1676.80 +/- 43.001430.0 1430.00 +/- 33.331420.0 730.18 +/- 33.39751.0 1947.80 +/- 13.801990.00.00 +/- 0.000.0 512.03 +/- 43.37512.0 708.90 +/- 29.00694.0 2009.00 +/- 36.401910.0757.0 -1660.0Pass357.0 - 2030.0Pass3730.0 - 6890.0Pass3630.0 - 6790.0Pass4600.0 -7810.0Pass7980.0 - 14900.0Pass0.0 - 10.0Pass697.0 -1520.0Pass1210.0 -3010.0Pass1940.0 -8750.0Pass644.0 - 3870.0Pass2110.0 -3570.0Pass600.0 - 1280.0Pass882.0 -2130.0Pass807.0 - 1530.0Pass17700.0 - 34800.0Pass0.0 - 10.0Pass2310.0 - 5480.0Pass1030.0 - 1960.0Pass1240.0 - 1680.0Pass555.0 - 862.0Pass1690.0 -2380.0Pass0.0 -10.0Pass325.0 - 684.0Pass588.0 - 865.0Pass1600.0 - 2410.0Pass a Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing administered by Environmental Resources Associates, serving as a replacement for studies conducted previously by the Environmental Measurements Laboratory Quality Assessment Program (EML).

b Laboratory codes as follows:

STW (water), STAP (air filter), STSO (soil), STVE (vegetation).

Unless otherwise indicated, the laboratory result is given as the mean

+/-standard deviation for three determinations.

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

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

D-779 of 190 TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2008 (Page 1 of 2)

Concentration KnownControl ActivityLimits dAcceptance22.8016.00 -29.60Pass8.405.88 - 10.92Pass0.00-1.00 -1.00Pass0.00-1.00 - 1.00Pass472.00330.00 - 614.00Pass12.108.50 -15.70Pass11.407.98 -14.82Pass16.3011.40 -21.20Pass2.431.22 - 3.65Pass3.552.49 - 4.62Pass1.310.92 -1.70Pass2.521.76 -3.28Pass2.701.89 - 3.51Pass0.000.00 -1.00Pass1.551.08 - 2.01Pass2.041.43-2.65Pass0.290.14 - 0.43Pass6.894.82 - 8.96Pass2.771.94-3.60Pass6.284.40 - 8.16Pass3.412.39 - 4.43Pass3.32 - 6.16Pass0.000.00 -1.00Pass421.00295.00 - 547.00Pass2.900.00 - 5.00Pass854.00598.00 - 1110.00Pass545.00382.00 - 709.00Pass570.00399.00 -741.00Pass0.000.00 -1.00Pass333.00233.00 - 433.00Pass145.00102.00 - 189.00Pass581.00407.00 - 755.00Pass2.800.00 - 5.00Pass570.00399.00 - 741.00Pass415.00291.00 -540.00Pass0.000.00 - 5.00Pass0.000.00 - 5.00Pass D-8 80 of 190 Lab Code°Analysis STW-113701/01/08Co-57 STW-1 13701 /01 /08Co-60 STW-113701 /01 /08Cs-134 STW-113701 /01 /08Cs-137 STW-113701/01 /08H-3 STW-113701/01/08Mn-54 STW-113701/01/08Sr-90 STW-113701 /01 /08Zn-65 Laboratory result 23.80 +/- 0.608.60 +/- 0.50-0.021 +/- 0.10 0.00 +/- 0.10515.10 +/- 12.7012.90 +/- 0.8012.00 +/- 1.50 16.90 +/- 1.40 STW-113801/01/08Gr. Beta 2.30 +/- 0.15 STAP-1139 01 /01 /08Co-57 STAP-1 139 01 /01 /08Co-60 STAP-1139 01 /01 /08Cs-134 STAP-1139 01 /01 /08Cs-137 STAP-1139 01/01/08Mn-54 STAP-1139 01/01/08Sr-90 STAP-1139 01 /01 /08Zn-65 3.90 +/- 0.07 1.43 +/- 0.07 2.59 +/- 0.16 3.05 +/- 0.12 0.43 +/- 0.58 1.30 +/- 0.27 2.36 +/- 0.18 STAP-1 140 01/01/08Gr. Beta 0.34 +/- 0.04STVE-1141 01/01/08Co-57 01 /08Co-60 01 /08Cs-134 01 /08Cs-137 01/08M n-54 01/08Zn-65 8.30 +/- 0.18 3.03 +/- 0.13 6.53 +/- 0.29 3.90 +/- 0.19 5.43 +/- 0.21 0.033 +/- 0.10STSO-1142 01/01/08Co-57STSO-1142 01/01/08Co-60STSO-1142 01/01/08Cs-134STSO-1142 01 /01 /08Cs-137STSO-1142 01 /01 /08Mn-54STSO-1142 01 /01 /08Zn-65483.00 +/- 3.00 3.00 +/- 0.80896.50 +/- 7.40624.40 +/- 4.10 667.20 +/- 3.80 0.093 +/- 0.91STSO-1 158 08/01/08Co-57STSO-1 158 08/01/08Co-60STSO-1158 08/01/08Cs-134STSO-1 158 08/01/08Cs-137STSO-1 158 08/01/08K-40STSO-1158 08/01/08Mn-54STSO-1158 08/01/08Sr-90STSO-1 158 08/01/08Zn-65 353.02 +/- 2.01 151.99 +/- 1.58 499.72 +/- 2.65 2.54 +/- 0.25643.94 +/- 15.50 452.14 +/- 2.96 1.95 +/- 2.04 0.10 +/- 2.04 TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2008 (Page 2 of 2)

Lab Code'DateAnalysis STVE-1159 08/01/08Co-57 STVE-1 159 08/01/08Co-60 STVE-1159 08/01/08Cs-134 STVE-1159 08/01/08Cs-137 STVE-1159 08/01/08Mn-54 STVE-1159 08/01/08Zn-65 Concentration Known Activity7.104.705.500.005.80 6.90 Control Limits dAcceptance 5.00 - 9.20Pass 3.30 - 6.10Pass 3.90 - 7.20Pass 0.00 - 1.00Pass 4.10 - 7.50Pass 4.80 - 9.00Pass Laboratory result 8.52 +/- 0.23 5.08 +/- 0.19 5.26 +/- 0.18 0.01 +/- 0.14 6.39 +/- 0.28 7.73 +/- 0.45STW-116208/01/08Co-570.03 +/- 0.16STW-116208/01/08Co-6011.27 +/- 0.23STW-116208/01/08Cs-13417.93 +/- 0.52STW-116208/01/08Cs-13723.72 +/- 0.43STW-116208/01/08H-3385.15 +/- 8.93STW-116208/01/08Mn-5413.87 +/- 0.37STW-116208/01/08Sr-906.49 +/- 1.12STW-116208/01/08Zn-6517.64 +/- 0.610.0011.6019.50 23.60341.0013.70 6.45 17.10 0.00 - 5.00Pass 8.10 -15.10Pass 13.70 - 25.40Pass 16.50 - 30.70Pass 239.00 - 443.00Pass 9.60 - 17.80Pass 4.52 - 8.39Pass 12.00 - 22.20Pass STW-116308/01/08Gr.Beta0.12 +/- 0.05 0.00 0.00 - 1.85Pass a Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the Department of Energy's Mixed Analyte Performance Evaluation Program, Idaho Operations office, Idaho Falls, Idaho b Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation).

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

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

D-981 of 190 APPENDIX E EFFLUENT REPORT 82 of 190 TABLE OF CONTENTS INTRODUCTION .................................................................................................................... 1

SUMMARY

............................................................................................................................. 21.0.EFFLUENTS ....................................................................................................... 3 1.1.Gaseous Effluents to the Atmosphere .................................................... 3 1.2.Liquids Released to Illinois River ............................................................. 3 2.0.SOLID RADIOACTIVE WASTE ......................................................................... 33.0.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 ...................................... 43.1.2.Radioactive Iodine ..................................................................... 5 3.1.2.1.Dose to Thyroid ........................................................... 5 3.2.Liquid Effluent Pathways ......................................................................... 5 3.3.Assessment of Dose to Member of Public .............................................. 5 4.0.SITE METEOROLOGY ...................................................................................... 6 i 83 of 190 Table of Contents (cont.)

APPENDIX E

-1DATA 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 190 INTRODUCTION LaSalle County Station, a two-unit BWR station, is located near Marseilles, Illinois in LaSalle county, 3.5 miles south the Illinois River. Both units are rated for 3489 MWt. Unit 1 loaded fuel in March 1982. Unit 2 loaded fuel in late December 1983.

The station has been designed to keep releases to the environment at levels below those specified in the regulations.

Liquid effluents, while no longer released from LaSalle County Station, were designed to be released to the Illinois River in controlled batches after radioassay of each batch. Gaseous effluents are released to the atmosphere after delay to permit decay of short-lived (noble) gases.

Releases to the atmosphere are calculated on the basis of analyses of routine grab samples of noble gases and tritium as well as continuously collected composite samples of iodine and particulate radioactivity sampled during the course of the year. The results of effluent analyses are summarized on a monthly basis and reported to the Nuclear Regulatory Commission as required per Technical Specifications.

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

1 85 of 190

SUMMARY

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

Calculations of environmental concentrations based on effluent, Illinois River flow, and meteorological data for the period indicate that consumption by the public of radionuclides attributable to LaSalle County Station does not exceed regulatory limits.

Radiation exposure from radionuclides releases to the atmosphere represented the critical pathway for the period with a maximum individual total dose estimated to be 6.78E-02 mrem for the year, where a shielding and occupancy factor of 0.7 is assumed. The assessment of radiationdoses 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 assessmentof 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 190 1.0 EFFLUENTS 1.1Gaseous Effluents to the Atmosphere Measured concentrations of noble gases, radioiodine, and particulate radioactivity released to the atmosphere during the year, are listed in Table 1.1-1. A total of 1.58E+03 curies of fission and activation gases were released with a maximum quarterly average release rate of 5.00E+01 pCi/sec.

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

A total of 4.69E-03 curies of beta-gamma emitters was released as airborne particulate matter with a maximum quarterly average release rate of 1.48E-04 pCi/sec.

Alpha-emitting radionuclides were below the lower limit of detection (LLD).

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

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

2.0 SOLID RADIOACTIVE WASTE Solid radioactive wastes were shipped by truck to the Envirocare Disposal Facility or to a waste processor. For further detail, refer the LaSalle 2008 Radioactive Effluent Release Report.

The submittal date of this report was April 30, 2008.

3.0 DOSE TO MAN 3.1Gaseous 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 3.1.1.1Gamma Dose Rates Unit 1 and Unit 2 gaseous releases at LaSalle 3 87 of 190 County Station are reported as Unit 1 releases due to a single station vent stack (SVS) release point.Offsite Gamma air and whole body dose rates are shown in Table 3.1-1 and were calculated based on measured release rates, isotopic composition of the noble gases, and average meteorological data for the period. Doses based on concurrent meteorological data are shown in Table 3.4-1.

Based on measured effluents and meteorological data, the maximum total body dose to an individual would be 2.12E-02 mrem (Table 3.1-1) for the year, with an occupancy or shielding factor of 0.7 included. The maximum total body dose based on measured effluents and concurrent meteorological data would be 6.06E-03 mrem. (Table 3.4-1).

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

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

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

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

The maximum offsite beta dose for the year was 8.40E-03 mrad (Table 3.1-1) and 1.91E-03 mrad (Table 3.4-1) based on concurrent meteorological data.

4 88 of 190 3.1.2 Radioactive Iodine The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine.

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

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

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

The maximum thyroid does due to 1-131 was 6.78E-02 mrem (child) for the year (Table 3.1-1).

3.2Liquid 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 DoseCalculation Manual. The maximum whole body dose was 0.00E+00 mrem and organ dose was 0.00E+00 for the year mrem (Table 3.2-1).3.3 Assessment of Dose to Member of Public During the period January to December, 2008, LaSalle County Station did not exceed these limits as shown in Table 3.1-1 and Table 3.2-1 (based on annual average meteorological data), and As shown in Table 3.3-1:The Radiological Effluent Technical Standards (RETS) limits on dose or dose commitment to an individual due to 5 89 of 190 radioactive materials in liquid effluents from each reactor unit (1.5 mrem to the whole body or 5 mrem to any organ during any calendar year; 3 mrem to the whole body or 10 mrem to any organ during the calendar year).The RETS limits on air dose in noble gases released in gaseous effluents to a member of the public from each reactor unit (5 mrad for gamma radiation or 10 mrad for beta radiation during any calendar quarter; 10 mrads for gamma radiation or 20 mrad for beta radiation during a calendar year).The RETS limits on dose to a member of the public due to iodine-131, iodine-133, tritium, and radionuclides in particulate form with half-lives greater than eight days in gaseous effluents released from each reactor unit (7.5 mrem to any organ during any calendar quarter; 15 mrem to any organ during any calendar year).The 10CFR20 limit on Total Effective Dose Equivalent to individual members of the public (100 mrem).

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

• Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1) 6 90 of 190 APPENDIX E-1 DATA TABLES AND FIGURES Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2008)UNITS ONE AND TWO DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES 1st Qtr 2nd Qtr 3rd Qtr 4`t Estimated Total Error %

Units A. Fission and Activation Gas Releases 1.Total Release ActivityCi3.66E+023.18E+022.08E+02 2.Average Release RateuCi/sec 4.66E+014.04E+012.62E+01 3.Percent of Technical Specification%Limit B. Iodine Releases 1.Total 1-131 ActivityCi1.19E-025.94E-031.49E-02 2.Average Release RateuCi/sec1.51E-037.55E-041.87E-03 3.Percent of Technical Specification%Limit C. Particulate (> 8 day half-life) Releases 1.Gross ActivityCi9.16E-047.75E-043.78E-04 2.Average Release Rateuci/sec1.17E-049.85E-054.76E-05 3.Percent of Technical Specification%Limit 4.Gross Alpha ActivityCi<1.OOE-11<I.OOE-11<1.OOE-11 D. Tritium Releases 1.Total Release ActivityCi2.03E+011.11E+019.26E+00 2.Average Release RateuCi/sec2.59E+001.41E+001.16E+00 3.Percent of Technical Specification%Limit"*" This information is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in uCi/mI E - 1.292 of 190 6.90E+02 8.68E+01 1.37E-02 1.73E-03 2.62E-03 3.30E-04<I.OOE-11 1.77E+01 2.23E+00 2.50E+01 1.50E+01 3.50E+01 1.50E+01 Table 1.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2008)

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

Units A. Fission and Activation Products 1.Total Activity Released 2.Average Concentration Released 3.Percent of Applicable Limit B. Tritium 1.Total Activity Released 2.Average Concentration Released 3.Percent of Applicable Limit C. Dissolved Noble Gases 1.Total Activity Released 2.Average Concentration Released 3.Percent of Applicable Limit D. Gross Alpha 1.Total Activity Released (estimate)

Ci<LLD<LLD<LLD<LLD 2. Average Concentration Released uCi/ml<LLD<LLD<LLD<LLD 3. Percent of Applicable Limit%E. Volume of Liquid Waste to Discharge liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A F. Volume of Dilution Water liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A"*" This information is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in uCi/ml E - 1.393 of 190 Ci<LLD<LLD<LLD<LLD uCi/ml<LLD<LLD<LLD<LLD****Ci<LLD<LLD<LLD<LLD uCi/ml<LLD<LLD<LLD<LLD****Ci<LLD<LLD<LLD<LLD uCi/ml<LLD<LLD<LLD<LLD****N/A N/A N/A N/A Table 2.1-1 SOLID RADWASTE ANNUAL REPORT LaSalle County Station Table 2.1-1 deliberately deleted. For solid waste disposal detail, refer to the LaSalle County Station 2008 Effluent Report.

E - 1.494 of 190 Table 3.1-1 LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 INFANT RECEPTOR 1ST2ND3RD4TH TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC GAMMA AIR6.58E-035.62E-033.24E-031.26E-022.80E-02 (MRAD)(WSW )(WSW )(WSW )(WSW )(WSW )BETA AIR1.93E-041.66E-041.24E-043.57E-048.40E-04 (MRAD)(ESE )(ESE )(ESE )(ESE )(ESE )TOT. BODY4.98E-034.25E-032.45E-039.50E-032.12E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )SKIN5.22E-034.45E-032.59E-039.95E-032.22E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )ORGAN1.90E-031.01E-023.65E-021.18E-026.03E-02 (MREM)(ESE )(ESE )(ESE )(ESE )(ESE )THYROIDTHYROIDTHYROIDTHYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I INFANT RECEPTOR

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QTRLY1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I GAMMA AIR(MRAD)5.00.130.110.060.2510.00.28 BETA AIR (MRAD)10.00.000.000.000.0020.00.00 TOT. BODY(MREM)2.50.200.170.100.385.00.42 SKIN (MREM)7.50.070.060.030.1315.00.15 ORGAN (MREM)7.50.030.130.490.1615.00.40 THYROIDTHYROIDTHYROIDTHYROIDTHYROIDRESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.595 of 190 Table 3.1-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 CHILD RECEPTOR 1ST2ND3RD4TH TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC GAMMA AIR6.58E-035.62E-033.24E-031.26E-022.80E-02 (MRAD)(WSW )(WSW )(WSW )(WSW )(WSW )BETA AIR1.93E-041.66E-041.24E-043.57E-048.40E-04 (MRAD)(ESE )(ESE )(ESE )(ESE )(ESE )TOT. BODY4.98E-034.25E-032.45E-039.50E-032.12E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )SKIN5.22E-034.45E-032.59E-039.95E-032.22E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )ORGAN1.59E-031.30E-023.94E-021.40E-026.78E-02 (MREM)(NNE )(NNE )(ESE )(NNE )(NNE )THYROIDTHYROIDTHYROIDTHYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I CHILD RECEPTOR

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QTRLY1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I GAMMA AIR MRAD)5.00.130.110.060.2510.00.28 BETA AIR MRAD)10.00.000.000.000.0020.00.00 TOT. BODY MREM)2.50.200.170.100.385.00.42 SKIN (MREM)7.50.070.060.030.1315.00.15 ORGAN (MREM)7.50.020.170.530.1915.00.45THYROID THYROID THYROIDTHYROIDTHYROIDRESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.696 of 190 Table 3.1-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 TEENAGER RECEPTOR 1ST2ND3RD4TH TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC GAMMA AIR6.58E-035.62E-033.24E-031.26E-022.80E-02 (MRAD)(WSW )(WSW )(WSW )(WSW )(WSW )BETA AIR1.93E-041.66E-041.24E-043.57E-048.40E-04 (MRAD)(ESE )(ESE )(ESE )(ESE )(ESE )TOT. BODY4.98E-034.25E-032.45E-039.50E-032.12E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )SKIN5.22E-034.45E-032.59E-039.95E-032.22E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )ORGAN1.18E-038.12E-032.41E-028.79E-034.22E-02 (MREM)(NNE )(NNE )(NNE )(NNE )(NNE )THYROIDTHYROIDTHYROIDTHYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I TEENAGER RECEPTOR

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QTRLY1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I GAMMA AIR(MRAD)5.00.130.110.060.2510.00.28 BETA AIR MRAD)10.00.000.000.000.0020.00.00 TOT. BODY(MREM)2.50.200.170.100.385.00.42 SKIN (MREM)7.50.070.060.030.1315.00.15 ORGAN (MREM)7.50.020.110.320.1215.00.28 THYROIDTHYROIDTHYROIDTHYROIDTHYROIDRESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 Table 3.1-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 ADULT RECEPTOR 1ST2ND3RD4TH TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC GAMMA AIR6.58E-035.62E-033.24E-031.26E-022.80E-02 (MRAD)(WSW )(WSW )(WSW )(WSW )(WSW )BETA AIR1.93E-041.66E-041.24E-043.57E-048.40E-04 (MRAD)(ESE )(ESE )(ESE )(ESE )(ESE )TOT. BODY4.98E-034.25E-032.45E-039.50E-032.12E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )SKIN5.22E-034.45E-032.59E-039.95E-032.22E-02 (MREM)(WSW )(WSW )(WSW )(WSW )(WSW )ORGAN1.31E-038.17E-032.49E-028.96E-034.33E-02 (MREM)(NNE )(NNE )(NNE )(NNE )(NNE )THYROIDTHYROIDTHYROIDTHYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10CFR 50 APP. I ADULT RECEPTOR

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QTRLY1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I GAMMA AIR(MRAD)5.00.130.110.060.2510.00.28 BETA AIR MRAD)10.00.000.000.000.0020.00.00 TOT. BODY(MREM)2.50.200.170.100.385.00.42 SKIN (MREM)7.50.070.060.030.1315.00.15 ORGAN (MREM)7.50.020.110.330.1215.00.29 THYROID THYROID THYROIDTHYROID THYROIDRESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 Table 3.2-1 LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 INFANT RECEPTOR 1ST2ND3RD4TH DOSE TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC TOTAL0.00E+000.00E+000.00E+000.00E+000.00E+00 BODY INTERNAL0.00E+000.00E+000.00E+000.00E+000.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

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QTRLY1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OF OBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I TOTAL BODY(MREM)1.50.000.000.000.003.00.00 CRIT. ORGAN(MREM) 5.00.000.000.000.0010.00.00RESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.999 of 190 Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 CHILD RECEPTOR 1ST2ND3RD4TH DOSE TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC TOTAL0.00E+000.00E+000.00E+000.00E+000.00E+00 BODY INTERNAL0.00E+000.00E+000.00E+000.00E+000.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

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QTRLY1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OF OBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I TOTAL BODY (MREM) 1.50.000.000.000.003.00.00 CRIT. ORGAN(MREM) 5.00.000.000.000.0010.00.00RESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.10100 of 190 Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 TEENAGER RECEPTOR 1ST2ND3RD4TH DOSE TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC TOTAL0.00E+000.00E+000.00E+000.00E+000.00E+00 BODY INTERNAL0.00E+000.00E+000.00E+000.00E+000.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

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QTRLY1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OF OBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I TOTAL BODY (MREM) 1.50.000.000.000.003.00.00 CRIT. ORGAN(MREM) 5.00.000.000.000.0010.00.00RESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1. 11101 of 190 Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2008 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTS PERIOD OF RELEASE - 01/01/08 TO 12/31/08CALCULATED 03/23/09 ADULT RECEPTOR 1ST2ND3RD4TH DOSE TYPE QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC TOTAL0.00E+000.00E+000.00E+000.00E+000.00E+00 BODY INTERNAL0.00E+000.00E+000.00E+000.00E+000.00E+00 ORGAN THIS IS A REPORT FOR THE CALENDAR YEAR 2008 COMPLIANCE STATUS - 10 CFR 50 APP. I

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QTRLY1ST QTR 2ND QTR 3RD QTR4TH QTR YRLY%OF OBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP.I TOTAL BODY (MREM) 1.50.000.000.000.003.00.00 CRIT. ORGAN(MREM) 5.00.000.000.000.0010.00.00RESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.12102 of 190 Table 3.3-1 LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09 1.10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr3.43E-01 10 CFR 20.1301 (a)(1) limitmrem/yr100.0 of limit0.34 Compliance Summary - 10CFR20 1st2nd3rd4th% of QtrQtrQtrQtrLimit TEDE5.89E-02 9.44E-02 9.08E-02 9.90E-020.34 RESULTS BASED UPON: ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.13103 of 190 Table 3.3-1 (continued)

LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09 2.10 CFR 20.1301 (d)/40 CFR 190 Compliance DoseLimit%of (mrem)(mrem)Limit Plume2.12E-02 Skyshine3.15E-01 Ground5.57E-04Total 3.36E-0125.01.35 Thyroid3.75E-0275.00.05 Gonads5.69E-0325.00.02 Breast5.69E-0325.00.02 Lung5.69E-0325.00.02 Marrow5.70E-0325.00.02 Bone5.70E-0325.00.02 Remainder5.73E-0325.00.02 CEDE6.66E-03 TEDE3.43E-01100.00.34 RESULTS BASED UPON: ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 Whole Body (DDE)Organ Dose (CDE)E - 1. 14104 of 190 Table 3.3-1 (continued)

LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09 1.10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr3.54E-01 10 CFR 20.1301 (a)(1) limitmrem/yr100.0 of limit0.35 Compliance Summary - 10CFR20 1st2nd3rd4th% of QtrQtrQtrQtrLimit TEDE8.92E-02 8.83E-02 8.73E-02 8.93E-020.35 RESULTS BASED UPON: ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E - 1.15105 of 190 Table 3.3-1 (continued)

LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/08 TO 12/31/08 CALCULATED 03/23/09 2.10 CFR 20.1301 (d)/40 CFR 190 Compliance DoseLimit% of (mrem)(mrem)Limit Whole BodyPlume0.00E+00 (DDE)Skyshine3.54E-01 Ground0.00E+00Total 3.54E-0125.01.42 Thyroid0.00E+0075.00.00 Gonads0.00E+0025.00.00 Breast0.00E+0025.00.00 Lung0.00E+0025.00.00 Marrow0.00E+0025.00.00 Bone0.00E+0025.00.00 Remainder0.00E+0025.00.00 CEDE0.00E+00 TEDE3.54E-01100.00.35 RESULTS BASED UPON: ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 Organ Dose (CDE)E - 1.16106 of 190 Table 3.4-1 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2008 TYPE OF DOSE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTERANNUAL GAMMA AIR (mrad)4.140E-03( SE)2.995E-03( SE)2.795E-03(WSW)6.800E-03(SSE)1.419E-02( SE)

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

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

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

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

CRITICAL PERSONChildChildChildChildChild CRITICAL ORGANThyroidThyroidThyroidThyroidThyroid COMPLIANCE STATUS 10 CFR 50 APP. I10 CFR 50 APP.I TYPE OF DOSEQUARTERLY OBJECTIVE % OF APP. I YEARLY OBJECTIVE%OF APP. I GAMMA AIR (mrad)5.00.1410.00.14 BETA AIR (mrad)10.00.0120.00.01 WHOLE BODY (mrem)2.50.115.00.12 SKIN (mrem)7.50.0515.00.05 ORGAN (mrem)7.50.0015.00.00 CRITICAL PERSONChildChild CRITICAL ORGANThyroidThyroid Calculation used release data from the following:

Unit 0 - Chimney Date of calculation:3/26/2009 E - 1.17107 of 190 Table 3.4-1 (continued)

LaSalle Station - Unit 2 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2008 TYPE OF DOSE GAMMA AIR (mrad)

BETA AIR (mrad)

WHOLE BODY (mrem)

SKIN (mrem)

ORGAN (mrem)FIRST QUARTERSECOND QUARTER THIRD QUARTER FOURTH QUARTERANNUAL4.140E-03( SE)2.995E-03( SE)2.795E-03(WSW)6.800E-03(SSE)1.419E-02( SE)5.800E-04(ESE)3.115E-04( SE)2.750E-04( E )7.900E-04(ESE)1.909E-03(ESE)1.755E-03(SSW)1.155E-03(SSW)9.800E-04(SSW)2.680E-03(ESE)6.055E-03(ESE)2.330E-03(ESE)1.375E-03(ESE)1.150E-03(SSW)3.570E-03(ESE)8.195E-03(ESE)2.130E-04(ESE)7.700E-05( SE)1.690E-04( E )1.845E-04(ESE)6.160E-04(ESE)

CRITICAL PERSONChildChildChildChildChild CRITICAL ORGANThyroidThyroidThyroidThyroidThyroid COMPLIANCE STATUS10 CFR 50 APP. I10 CFR 50 APP.I TYPE OF DOSEQUARTERLY OBJECTIVE % OF APP. I YEARLY OBJECTIVE%OF APP. I GAMMA AIR (mrad)5.00.1410.00.14 BETA AIR (mrad)10.00.0120.00.01 WHOLE BODY (mrem)2.50.115.00.12 SKIN (mrem)7.50.0515.00.05 ORGAN (mrem)7.50.0015.00.00 CRITICAL PERSONChildChild CRITICAL ORGANThyroidThyroid Calculation used release data from the following:

Unit 0 - Chimney Date of calculation:3/26/2009 E - 1.18108 of 190 APPENDIX F METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0001001NNE0010001NE00348116ENE0030227 E0000000ESE0000000SE0000000SSE0000000 S0001809SSW0000000SW0000000WSW0000011 W0000000WNW0000000NW0110002NNW0031026 Variable0000000 Total0111718643 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Unstable200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0056 NNE0152 1012 008NE0012003ENE0000000 E0000000ESE0002002SE0021003SSE0000000 S0000000SSW0002002SW0001203WSW0001001 W0003014WNW00120 4NW0221005NNW0013509 Variable0000000 Total0317268256 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0011103NNE02750014NE0040004ENE0000000 E0110002ESE0004004SE0033006SSE0100203 S0000000SSW0122005SW0050005WSW0022116 W008100119WNW0013116NW0006208NNW0023207 Variable0000000 Total0536399392Hours of calmin this stabilityclass:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class-Neutral-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N01436170067NNE0234960078NE0719221049ENE14122612055 E12353210080ESE128269046SE028151026SSE2322136046 S0712235047SSW21221257168SW45181012554WSW21115113143 W024343567106WNW21431963121195NW0114341127114NNW08444650103 Variable0000000 Total15149407444120421177 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N018100019NNE123400028NE2250009ENE1030004 E031591028ESE1112111026SE031390025SSE292071039 S12113211562SSW01094318585SW339116133WSW29411017 W39596335WNW11286182065NW0123162253NNW16400011 Variable0000000 Total181221541446536539Hours of calmin this stabilityclass:1 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0200002 0000000 1000001ENE000000 E022000ESE 035000SE0324009SSE15101 0017 S25594025SSW021041017SW05700012WSW08750020 W08950022WNW0221111035NW051210018NNW0200002 Variable0000000 Total472803060192 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 NNE NE 0 4 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0000000 E0100001ESE0100001SE0400004SSE0520007 S0053008SSW041140019SW061210019WSW0431008 W0240006WNW07100080110002NNW 0000000 Variable0000000 Total0353990083 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0000000Sw0000000WSW0000000 w0000000WNW0000000NW0000000NNW0000000 Variable0000000 Total0000000 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000033SSW0000000SW0000000WSW0000000 W0000000WNW0000000NW0000000NNW0000000 Variable0000000 Total0000033 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0000000NNE0010102NE0001045ENE0000000 E0000000ESE0000202SE0001001SSE0000000 S0000022SSW0000000SW0000000WSW0000112 W0000000WNW0000011NW0000000NNW0000000 Variable0000000 Total00124815 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:1 Hours of missing stability measurements in all stability classes:F-10119 of 190 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Neutral-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N04202734287NNE152548256110NE061613131361ENE031020281475 E11617161152ESE1261720652SE016128229SSE1241412235 S16510222266SSW03913202873SW231114121557WSW01714139356 W1926263538135WNW2817397173210NW152947349125NNW05152624676 Variable0000000 Total11802193563832501299 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:59 Hours of missing stability measurements in all stability classes:1F-11120 of 190 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Slightly Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N00361010NNE006110017NE00461011ENE1007109 E02189525ESE110471023SE10032612SSE22413181150 S02311105783SSW06311878106SW11544722WSW11405415 W2313672556WNW1310975383NW0382219658NNW03270012 Variable0000000 Total10276612899262592 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:1F-12121 of 190 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Moderately Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0110103NNE0001001NE0000000ENE0000000 E0020204ESE0100034SE0011136SSE01124412 S003201823SSW010131621SW0012216WSW01465723 W01364721WNW00280212NW01499225NNW0003508 Variable0000000 Total0722413663169 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:

F-13122 of 190 LaSalle County Generating Station Period of Record: January - March 2008 Stability Class - Extremely Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N1001002NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S1001125SSW001211418SW0022509WSW0013004 W0001001WNW0000101NW0000000NNW1001204 Variable0000000 Total30411101644 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:1F-14123 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Extremely Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0000011 E0000011ESE0001001SE0100001SSE0032005 S01023612SSW001510319SW0010113WSW0010416 W0003014WNW01550011NW0041005NNW0000000 Variable0000000 Total031519181469 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-15124 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0034007NNE0000000NE0000000ENE0005117 E0100225ESE0111047SE0010001SSE0026019 S00133310SSW00343212SW01412210WSW00284014 W00180110WNW107134025NW00361010NNW0114006 Variable0000000 Total1429632016133 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-16125 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Slightly Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0480 NNE00113 0012 0014NE0012003ENE00353011 E0021003ESE0020305SE00036110SSE0025007 S00334313SSW00574319SW04612013WSW0110127131 W00463013WNW0158 1 0 15NW026110 19NNW007180025 Variable0000000 Total0127585338213 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:3F-17126 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Neutral-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0281523048NNE0211231037NE1928331072ENE0411277453 E1612141135ESE25951123SE051643634SSE076101024 S05121820358SSW071017844636121488511 622166455 W015151316665WNW012201512059NW 193225 2069NNW0629225062 Variable0000000 Total91512612389537791 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:3F-18127 of 190 SW WSW LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Slightly Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24>24Total N022500027NNE115610023NE131410019ENE07770021 E061320021ESE071177032SE06850019SSE026141023 S1812367064SSW0622464078SW041671129WSW41015111041 W3101335135WNW27759232NW016420022NNW110810020 Variable0000000 Total13139167148354S06 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:3F-19128 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Moderately Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0200002NNE1400005NE0300003ENE1200003 E1131300027ESE041310018SE231400019SSE15400010 S171120021SSW061420022SW17890025WSW1101030024 W2131000025WNW432500041NW0450009NNW0500005 Variable0000000 Total151201071700259 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:3F-20129 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Extremely Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total--------------------------------------------N0000000NNE0000000NE0000000ENE0100001 E0200002ESE010300013SE1101300024SSE0131000023 S011400015SSW061300019SW0101900029WSW1111700029 W0151000025WNW021100022NW0700007NNW0000000 Variable0000000 Total211790000209 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-21130 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Extremely Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0 00 0000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000011SSW0000022SW0000000W S W0000000 W0000000WNW0000000NW0000000NNW0000000 Variable0000000 Total0000033 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:3F-22131 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000 000NE0 00 0000ENE0000000 E0 00 0000ESE0000000SE0000000SSE0000000 S0000044SSW0000235SW0000000WSW0000123 W0000000WNW0010001NW0000000NNW0000000 Variable0000000 Total00103913 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:3F-23132 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Slightly Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0002114 E0000000ESE0001001SE0010001SSE0025209 S01042916SSW0010157SW0000123WSW0001247 W0020316WNW0021003NW0011002NNW0000000 Variable0000000 Total01915122259 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-24133 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Neutral-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N01316205357NNE08141920465NE111218361583ENE13612221155 E245136737ESE0211621233SE1412815747SSE029187541 S0177254787SSW07169164088SW061414151867WSW0512402222101 W0121312162174WNW0722254114109NW071743357109NNW06162319569 Variable0000000 Total5882022873022381122 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-25134 of 190 LaSalle County Generating Station Period of Record: April - J une2008 Stability Class - Slightly Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N047126029NNE0310113027NE03975024ENE019812232 E00495119ESE013381429SE007421124SSE014571128 S124494666SSW0165166896SW0136112243WSW1361191343 W0368141748WNW02616111146NW061296235NNW252118028 Variable0000000 Total43698129132218617Hours of calmin this stabilityclass:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:3F-26135 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Moderately Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0223007NNE0300003NE0011002ENE0000000 E00081110ESE00373518SE00398525SSE00074819 S000651122SSW010241017SW011691330WSW01574320 W026611227WNW0241511133NW023107022NNW034111019 Variable0000000 Total01732986859274Hours of calmin this stabilityclass:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:3F-27136 of 190 LaSalle County Generating Station Period of Record: April - June2008 Stability Class - Extremely Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0002103SE0000279SSE000031114 S000411116SSW 00162110SW0 114039 WSW00 W00 015612 225211 WNW NW 0 111306 0100023 NNW0000000 Variable0000000 Total03520224393 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-28137 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0130004NNE0000000NE0 00 0000ENE0000000 E0 00 0000ESE0000000SE0000000SSE0000000 S0000000SSW0000000SW0323109WSW01712011 W00740011WNW00730010NW0015006NNW0021003 Variable0000000 Total0529173054 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:0F-29138 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N011000011NNE0310004NE0060006ENE0010001 E0 01 0001ESE0020002SE0020002SSE0001001 S0031004SSW0350008SW041540023WSW051810024 W012320026WNW042130028NW0150006NNW0132006 Variable0000000 Total0231161400153 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:0F-30139 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Slightly Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N071600023NNE08500013NE0270009ENE01810010 E0060006ESE020005SE0152008SSE0231006 S04720013SSW05800013SW081340025WSW041041019 W062640036WNW061720025NW02900011NNW071950031 Variable0000000 Total0661612510253 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:0F-31140 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Neutral-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N1331730054NNE233700042NE0223260060ENE0233270062 E0201730040ESE1121200025SE1241810044SSE0281800046 S0102410035SSW110740022SW0162950050WSW2121171033 W0151511032WNW2171252038NW081660030NNW0132021036 Variable0000000 Total102962875150649 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:0F-32141 of 190 LaSalle County Generating Station Period of Record: July - September 2008Stability Class - Slightly Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N123310028NNE323100027NE391600028ENE062110028 E1182120042ESE014300017 SE314200019SSE216600024 S291210024SSW3161510035SW1111110024WSW2151510033 W3141400031WNW026500031NW227510035NNW116300020 Variable0000000 Total27257153900446 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:1 Hours of missing stability measurements in all stability classes:0 F-33142 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total-------------------------N115000016NNE48000012NE1310005ENE0300003 E0181000028ESE032300035SE234100037SSE210110014 S219400025SSW28200012SW218000020WSW0151300028 W510200017WNW414200020NW420200026NNW310000013 Variable0000000 Total3223741100311Hours of calmin this stabilityclass:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:0F-34143 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N3200005NNE1100002NE1000001ENE0000000 E0500005ESE353100057SE029000029SSE018100019 S222000024SSW0361100047SW053500058WSW2231800043 W024400028WNW115000016NW1300004NNW1200003 Variable0000000 Total1528640000341 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:0F-35144 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0000000SW0000000WSW0000000 W0000000WNW00000NW00000 NNW0000000 Variable0 000000 Total0000000 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 00 0 F-36145 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000 0 0 0ENE000 0000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0000000SW0000000WSW0000000 W0001001WNW0000000NW0000011NNW0000000 Variable0000000 Total0001012 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-37146 of 190 LaSalle County Generating Station Period of Record: July -

September 2008 Stability Class -Slightly Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0001001NE0004004ENE0001001 E0000000ESE0000000SE0000000SSE0000000 S0003003SSW0010102SW0011248WSW0017008 W00550010WNW0050005NW0001023NNW0000000 Variable0000000 Total0013233645 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:0F-38147 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Neutral-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N01634225279NNE01131144060NE017223116086ENE01418248165 E0713130033ESE0101840032SE02214113050SSE01418110043 S11019275062SSW02141112443SW07283319592WSW01034228175 W0753284294WNW01332177372NW04213213070NNW09322S4070 Variable0000000 Total1173401325108181026 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:0F-39148 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Slightly Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N061115124NNE268141031NE033304040ENE1211284147 E1361612240ESE0751111034SE06472019SSE135103123 S2441015540SSW4197181049SW058113431WSW055712130 W04101413243WNW239176441NW1212255146NNW195189042 variable0000000 Total156910523612332580 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:0F-40149 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Moderately Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N15571019NNE04760017NE1331008ENE03341011 E216116026ESE226611229SE1151781143SSE058115332 S176115131SSW01553418SW005128328WSW012119124 W02101111539WNW021237125 NW11762017NNW01572015 Variable0000000 Total939951297931382 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:0F-41150 of 190 LaSalle County Generating Station Period of Record: July - September 2008 Stability Class - Extremely Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0120003 E0021003ESE00138214SE000213520SSE00146718 S00157013SSW001411723SW002311622WSW00059115 W00716519WNW01287018NW0011002NNW0000101 Variable0000000 Total0220377933171 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:0F-42151 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total-------------------------N0010001NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000202SSE0001001 S0000000SSW0000000SW0001001WSW0000000 w0000000WNW0000000NW0010001NNW0000404 Variable0000000 Total00226010 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:16 Hours of missing stability measurements in all stability classes:4F-43152 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)Direction1-34-78-1213-1819-24> 24Total N0122005NNE0000000NE0000000ENE0000000 E0000000ESE0001001SE0001001SSE0001001 S0001001SSW0013206SW0000000WSW0001001 W0000000WNW0017019NW0020002NNW0122409 Variable0000000 Total028196136 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:4F-44153 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Unstable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total--------------------N00370010NNE0022004NE0000000ENE0000000 E0000000ESE0100001SE0002002SSE0010001 S0040105SSW005112018SW0002103WSW0003003 W0001001WNW00181313NW0111003NNW0004307 Variable0000000 Total0217418371 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:4F-45154 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Neutral-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N02230241077NNE110500016NE013500018ENE11613130043 E051680029ESE0219257154SE0515170037SSE03951018 S0327139658SSW01225314072SW0430121047WSW1818225155 W11021222258WNW01058661810162NW06293710082NNW0154572140146 Variable0000000 Total41443653677220972Hours of calm this stabilityclass:1 Hours of missing wind measurements in this stability class:59 Hours of missing stability measurements in all stability classes:4F-46155 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N215410022NNE27200011NE0330006ENE041010015 E0718120037ESE1812171039SE08250015SSE010513019 S1101712211071SSW19102116158SW2616143041WSW214113425 W36447327WNW061514201469NW272630038NNW371640030 Variable0000000 Total191141641207432523 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:28 Hours of missing stability measurements in all stability classes:4F-47156 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)Direction1-34-78-1213-1819-24> 24Total N19000010NNE0100001NE0100001ENE1120004 E0101610027ESE26800016SE09200011SSE114630024 S171050023SSW031850026SW111150018WSW0440008 W121480025WNW118830030NW0200002NNW0200002 Variable0000000 Total990993000228 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:22 Hours of missing stability measurements in all stability classes:4F-48157 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Stable-200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0500005NNE0100001NE0000000ENE0000000 E0400004ESE020300023SE09300012SSE0161400030 S1132500039SSW092000029SW0101410025WSW0141500029 W0131110025WNW0610007NW0000000NNW0100001 Variable0000000 Total1121106200230 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:4F-49158 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0000000SW0000000WSW0000101 W0000033WNW0000000NW0000000NNW0000000 Variable0000000 Total0000134 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:4F-50159 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24>24Total N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0000000SW0000000WSW0001135 W0000112WNW0000000NW0000000NNW0000000 Variable0000000 Total0001247 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:4F-51160 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Unstable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)Direction1-34-78-1213-1819-24> 24Total N0003104NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000101SSE0001001 S0000000SSW0000000SW0000000WSW0001012 W0000022WNW0001001NW0012003NNW0000033 Variable0000000 Total00182617 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:4F-52161 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Neutral-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N13171628368NNE07573022NE011842025ENE0411116032 E02615014ESE0268171245SE01416221053SSE01687123 S04921162272SSW01333331282SW1141917446WSW1481719756 W051119311480WNW0415474516127NW0220254927123NNW0326225918128 Variable0000000 Total355159274359146996Hours of calmin this stabilityclass:0 Hours of missing wind measurements in this stability class:172 Hours of missing stability measurements in all stability classes:4F-53162 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Slightly Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Wind Speed (in mph)

Direction1-34-78-1213-1819-24> 24Total--------------------15453018NNE033142022NE0216009ENE01583219E0035111433ESE030791837SE12136316SSE01282922S10617145290SSW12313193573SW1058182557WSW14211413W328831741WNW2078253274NW010720129NNW012814429 Variable0000000 Total112752126150216582 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:44 Hours of missing stability measurements in all stability classes:4F-54163 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Moderately Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0121004NNE0023005NE0034007ENE0012003 E00124512ESE00139417SE0115209SSE100521220 S000683145SSW001461728SW0476171044WSW00362011 W01855322WNW0037101030NW0006208NNW0003205 Variable0000000 Total1733686992270 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:

Hours of missing stability measurements in all stability classes:4F-55164 of 190 LaSalle County Generating Station Period of Record: October - December2008 Stability Class - Extremely Stable-375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N0100001 NNE0000000 NE0000000 ENE0000000 E0000000 ESE0 0 01034SE0000257SSE00038314 S0001211537SSW00005914SW1010147WSW0010001 W01305716WNW0041016NW0000000NNW0110013 Variable0000000 Total131064248110 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:4F-56165 of 190 APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

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

1. Summary and Conclusions ................................................................................................ 1 I I .Introduction

........................................................................................................................ 3 A.Objectives of the RGPP ........................................................................................ 3 B.Implementation of the Objectives

.......................................................................... 3 C.Program Description

.............................................................................................. 4 D.Characteristics of Tritium (H-3) ............................................................................. 4 111.Program Description ......................................................................................................... 5 A.Sample Analysis

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

5 B.Data Interpretation ................................................................................................. 6 C. Background Analysis

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

7 1.Background Concentrations of Tritium

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

7 IV.Results and Discussion ................................................................................................... 9 A.Groundwater Results ............................................................................................. 9 B.Drinking Water Well Survey ................................................................................ 10 C.Summary of Results - Inter-laboratory Comparison Program ........................... 10 D.Leaks, Spills, and Releases ................................................................................ 11 E.Trends .................................................................................................................. 11 F.Investigations ....................................................................................................... 11 G.Actions Taken ...................................................................................................... 11 168 of 190 Appendices Appendix ALocation Designation Tables Table A-1:LaSalle County Station Groundwater Monitoring Sample Point List Figures Figure A-1:LaSalle County Station Map of Groundwater Monitoring Sample Locations.

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

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

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

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

ii 169 of 190 I.Summary and Conclusions In 2006, Exelon instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of LaSalle County Station. This evaluation involved numerous station personnel and contractor support personnel. Baseline sampling efforts included the use of six surface water locations, two of which were already included in LaSalle's REMP sampling program, and seventeen groundwater well sampling locations.

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

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

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

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

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

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

Tritium was not detected in any of the groundwater or surface water samples at concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Low levels of tritium were detected at concentrations greater than the LLD of 200 pCi/L in 1 of 9 groundwater monitoring locations. The tritium concentrations ranged from 424 +/- 122 pCi/L to 719 +/- 133 pCi/L. No tritium was detected in the six surface water samples above the specified LLD. Elevated tritium levels (> 200 pCi/L) observed in the single well location are believed to be associated with the 2001 CY tank rupture as documented in the stations 1OCFR50.75(g) report.

1 170 of 190 Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) as specified in the Offsite Dose Calculation Manual (ODCM) in any of the groundwater or surface water samples. In the case of tritium, Exelon specified that it's laboratories achieve a lower limit of detection 10 times lower than that required by federal regulation.Strontium-90 was not detected at a concentration greater than the LLD of 2.0 picoCuries per liter (pCi/L) in any of the groundwater or surface water samples tested.2 171 of 190 II.Introduction The LaSalle County Station (LCS), consisting of two boiling water reactors, each rated for 3489 MWt, owned and operated by Exelon Corporation, is located in LaSalle County, Illinois. Unit No. 1 went critical on 16 March 1982. Unit No. 2 went critical on 02 December 1983. The site is located in northern Illinois, approximately 75 miles southwest of Chicago, Illinois.

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

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

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

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

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

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

5.Regularly assess analytical results to identify adverse trends.

6.Take necessary corrective actions to protect groundwater resources.

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

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

http://www.exelonCorp.com/ourcompanies

/powergen/nuclear/Tritiu-3-172 of 190 m.htm 2.The LaSalle County Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

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

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

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

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

Groundwater and Surface Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following EPA methods. Both groundwater and surface samples water are collected.

Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management, and shipment of samples, as well as in documentation of sampling events.

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

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

D.Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The 173 of 190 most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days.Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-7 and/or boron-10 are activated to produce tritium.

Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

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

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

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

5 174 of 190 Concentrations of gamma emitters in groundwater and surface water. (Biennially) 2.Concentrations of strontium in groundwater and surface water.(Biennially) 3.Concentrations of tritium in groundwater and surface water. (Semi-annually)B.Data Interpretation The radiological data collected prior to LaSalle County Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, LaSalle County Station was considered operational at initial criticality. Several factors were important in the interpretation of the data:

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

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

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

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

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

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

6 175 of 190 C.Background Analysis A pre-operational radiological environmental monitoring program (pre-operational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, precipitation, marine life, and foodstuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for LaSalle County Nuclear Power Station, Commonwealth Edison Company, Annual Reports for the years 1979 and 1981. The pre-operational REMP contained analytical results from samples collected from the surface water and groundwater.

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

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

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

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

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

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

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

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

Therefore, the typical background data provided may be 177 of 190 subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

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

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

IV.Results and Discussion A.Groundwater Results Groundwater Samples were collected from on and off-site wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.Tritium Samples from nine locations were analyzed for tritium activity (Table B-1.1, Appendix B). Tritium values ranged from non detectable to 719 pCi/L at well MW-LS-1 05S. Outside of the owner-controlled area, tritium concentrations were less than the detection limit . Based on the hyrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply.

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

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

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

Potassium-40 values ranged from 49 pCi/Liter to 67 pCi/Liter. No other gamma emitting nuclides were detected (Table B-1.2,-9-178 of 190 Appendix B).

B.Surface Water Results Surface Water Samples were collected from on and off-site wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.Tritium Samples from six locations were analyzed for tritium activity (Table B-11.1, Appendix B). All surface water samples were <LLD.

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

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

Gamma Emitters No gamma emitting nuclides were detected (Table B-11.2, Appendix B).Drinking Water Well Survey A drinking water well survey was conducted during the summer 2006 by CRA (CRA 2006) around the LaSalle County Station. This survey concluded that no residents in the vicinity of the plant utilize the shallow water aquifer as a drinking water supply. Site hydrological studies of aquifer flow and permeation rates from the shallow aquifer to the deep aquifer concluded that there is no feasible dose receptor via a ground water pathway at LaSalle.

D.Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and Environmental 179 of 190 Inc. (Midwest Labs) are presented in the AREOR.

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

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

G.Investigations There were no anomalous result investigations conducted at for LaSalle RGPP sample results in 2008 H.Actions Taken 1.Compensatory Actions There were no required compensatory actions as a result of RGPP monitoring at LaSalle in 2008.

2.Installation of Monitoring Wells No new monitoring wells were added beyond the initial phase for LaSalle in 2008.3.Actions to Recover/Reverse Plumes 2008 LaSalle RGPP efforts resulted in no required actions. 180 of 190 APPENDIX A LOCATION DESIGNATION

&DISTANCE Table A-1 LaSalle County Station Groundwater Monitoring Sample Point List Sample No.

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

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

SW-LS- 106 Active Circ Water Intake Bay MW-LS-101S SW Corner of Perimiter Road MW-LS-102S Inactive OLD Parking Lot West (Lake) Side MW-LS-103S Inactive MAF South Centerline MW-LS- 104S Active CY Storage Tanks MW-LS-105S Active Behind IRSF MW-LS-106S Active Spare Transformer Area - Back Toward Security Fence MW-LS-107S Active Old Service Building - Near Outage Trailers MW-LS-108S Inactive Near 12 KV Swithchyard A-1182 of 190 Sample No.

Location Current Well Status MW-LS-109S Inactive Near BDG 33 MW-LS- l l OS Inactive RSH Area by Valve Pit 16B MW-LS-111S West Perimeter Road before pad mounted transformer (right hand side)

Active MW-LS-I 12S Inactive Between perimeter security fences near SE corner.(Access via security gate east of 12 KV switchyard)

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

HP-2 North of tracks near Nuclear Fuel Lay-down Area Active HP-5 Active Near VQ LN2 Storage Tanks HP-7 Active Near UAT's HP-10 Active Near VQ LN2 Storage Tanks, South of HP-5 A-2183 of 190 APPENDIX A-1 LASALLE COUNTY STATION MAP OF GROUNDWATER MONITORING SAMPLE LOCATIONS ti UG-S-E'El1E1 EXELON GENERATION COMPANY, LLC FLEETWIDE TRITIUM ASSESSMENT MONITORING WELL AND SAMPLING LOCATIONS LASALLE GENERATING STATION MARSEILLES, ILLINOIS colomuworen a w^m=1=2-1 11^Vll_lrl=lll

-Exel, n.figure 4.1 APPENDIX B DATA TABLES 186 of 190 TABLE B-1.1CONCENTRATIONS OF TRITIUM AND STRONIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATEH-3SR-90 HP-1004/16/08< 184 HP-1009/16/08< 162 HP-1009/24/08< 166< 1.0 HP-205/06/08< 177 HP-209/17/08< 156 HP-209/24/08< 167< 1.0 HP-504/18/08< 184 HP-509/16/08< 159 HP-509/24/08< 169< 0.8 HP-705/06/08< 184 HP-709/16/08< 161 HP-709/24/08< 163< 0.9 MW-LS-104S04/18/08< 189 MW-LS-104S09/17/08< 159 MW-LS-104S09/24/08< 152< 0.9 MW-LS-1 05S06/19/08632 +/- 126 MW-LS-105S09/16/08424 +/- 122 MW-LS-105S09/23/08719 +/- 133< 1.1 MW-LS-106S04/15/08< 171 MW-LS-106S09/18/08< 162 MW-LS-106S09/23/08< 159< 1.1 MW-LS-107S04/29/08< 188 MW-LS-107S09/17/08< 149 MW-LS-107S09/24/08< 152< 1.1 MW-LS-111S04/16/08< 164 MW-LS-111S09/18/08< 160 MW-LS-111S09/23/08< 165< 1.6 TABLE B-I.2CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STCCOLLECTION Be-7K-40Mn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-951-131Cs-134Cs-137Ba-140La-140 PERIOD HP-1009/24/08< 19< 32< 1< 2< 4< 1< 2< 2< 3< 76< 1< 1< 55< 15 HP-209/24/08< 13< 7< 1< 1< 3< 1< 2< 1< 2< 46< 1< 1< 38< 10 HP-509/24/08< 17< 9< 1< 1< 4< 1< 2< 2< 3< 65< 1< 1< 48< 15 HP-709/24/08< 11< 8< 1< 1< 3< 1< 2< 1< 2< 44< 1< 1< 34< 12 MW-LS-104S09/24/08< 1649 +/- 27 < 1< 2< 4< 1< 2< 2< 3< 65< 1< 1< 49< 14 MW-LS-105S09/23/08< 21< 10< 1< 2< 5< 1< 3< 2< 4< 279< 1< 1< 128< 32 MW-LS-106S09/23/08< 1767 +/- 24 < 1< 2< 4< 1< 2< 2< 3< 69< 1< 1< 48< 14 MW-LS-107S09/24/08< 16< 9< 1< 1< 4< 1< 2< 1< 3< 66< 1< 1< 47< 15 MW-LS-111S09/23/08< 1658 +/- 26 < 1< 1< 4< 1< 2< 2< 3< 73< 1< 1< 55< 15 TABLE B-II.1 CONCENTRATIONS OF TRITIUM AND STRONIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATEH-3SR-90 SW-LS-10104/15/08< 187 SW-LS-10109/16/08< 162 SW-LS-10109/23/08< 169 SW-LS-10204/15/08< 191 SW-LS-10209/16/08< 163 SW-LS-10209/23/08< 170 SW-LS-10304/15/08< 199 SW-LS-10309/16/08< 165 SW-LS-10309/23/08< 169 SW-LS-10404/16/08< 182 SW-LS-10409/22/08< 169 SW-LS-10504/15/08< 173 SW-LS-10509/22/08< 170 SW-LS-10604/15/08< 177 SW-LS-10609/18/08< 160 SW-LS-10609/23/08< 169< 1.1< 1.2< 1.3< 1.0< 1.1< 0.9 TABLE B-II.2CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2008 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STCCOLLECTION Be-7K-40Mn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-951-131Cs-134Cs-137Ba-140La-140 PERIOD SW-LS-10109/23/08< 15< 27< 1< 1< 4< 1< 2< 2< 3< 57< 1< 1< 40< 14 SW-LS-10209/23/08< 13< 7< 1< 1< 3< 1< 1< 1< 2< 56< 1< 1< 39< 11 SW-LS-10309/23/08< 15< 7< 1< 2< 4< 1< 2< 2< 3< 60< 1< 1< 45< 11 SW-LS-10409/22/08< 13< 8< 1< 1< 3< 1< 2< 1< 2< 56< 1< 1< 41< 13 SW-LS-10509/22/08< 13< 7< 1< 1< 3< 1< 2< 1< 2< 53< 1< 1< 37< 14 SW-LS-10609/23/08< 14< 8< 1< 1< 3< 1< 2< 1< 2< 56< 1< 1< 42< 12