Text

2009 Annual Radiological Environmental Operating Report
	ML101320380
Person / Time
Site:	LaSalle
Issue date:	05/12/2010
From:	Wozniak D B; Exelon Generation Co, Exelon Nuclear, Teledyne Brown Engineering Environmental Services
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	RA10-021
	Download: ML101320380 (188)
	v • d • e

Nu c lear 10 CFR 50 Appendix I LaSalle Generating Stationwww.exeloncorp.com 26oi North 21st Road Marseilles, IL 61341-9757 RA1 0-021 May 12, 2010 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:

2009 Annual Radiological Environmental Operating Report Enclosed is the Exelon Generation Company, LLC, LaSalle County Station 2009 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 III 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 2009 Prepared By Teledyne Brown Engineering Environmental Services Nuclear LaSalle County Station Marseilles, IL 61341 May 2010 1 of 187 Table Of Contents Summary and Conclusions ..............................................................................................1 11.Introduction ..................................................................................................................... 2 A.Objectives of the REMP ...................................................................................... 2 B.Implementation of the Objectives ........................................................................ 2 III.Program Description

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2 A.Sample Collection ............................................................................................... 2 B.Sample Analysis

.................................................................................................. 4 C.Data Interpretation .............................................................................................. 5 D.Program Exceptions

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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 .........................................................................................................10 4.Sediment .................................................................................................10B.Atmospheric Environment .................................................................................101.Airborne ..................................................................................................10 a.Air Particulates .............................................................................10 b.Airborne Iodine ............................................................................112.Terrestrial ................................................................................................12 a.Milk ...............................................................................................12 b.Food Products .............................................................................12 C.Ambient Gamma Radiation ...............................................................................12 D.Land Use Survey ...............................................................................................13 E.Summary of Results - Inter-laboratory Comparison Program .......................... 13 i 2 of 187 Appendices Appendix ARadiological Environmental Monitoring Report Annual Summary Tables Table A-1Radiological Environmental Monitoring Program Annual Summary for the LaSalle County Station, 2009 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, 2009 Table B-2:Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2009 Figures Figure B-1:Inner Ring TLD Locations of the LaSalle County Station, 2009 Figure B-2:Outer Ring TLD Locations of the LaSalle County Station, 2009 Figure B-3:Fixed Air Sampling Locations of the LaSalle County Station, 2009 Figure B-4:Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2009 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, 2009.

Table C-1.2Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2009.

Table C-1.3Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2009.

Table C-11.1Concentrations of Tritium in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2009 ii 3of187 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-V11.1 Table C-VII.2 Table C-VII1.1 Table C-1X.1 Table C-IX.2 Table C-IX.3 Figures Figure C-1 Figure C-2 Figure C-3 Figure C-4 Figure C-5 Concentrations of Gamma Emitters in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2009.

Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of LaSalle County Station, 2009.

Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of LaSalle County Station, 2009.

Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2009.

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, 2009.

Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2009.

Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of LaSalle County Station, 2009.

Concentrations of 1-131 in Milk Samples Collected in the Vicinity of LaSalle County Station, 2009.

Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of LaSalle County Station, 2009.

Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of LaSalle County Station, 2009.

Quarterly TLD Results for LaSalle County Station, 2009.

Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Other and Control Locations for LaSalle County Station, 2009.

Summary of the Ambient Dosimetry Program for LaSalle County Station, 2009.

Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LCS, 2000 - 2009.

Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LCS, 2000 - 2009.

Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LCS, 2000 - 2009.

Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LCS, 2000 - 2009.

Air Particulate - Gross Beta - Station L-10 (C) Collected in the Vicinity of LCS, 2000 - 2009.

III 4 of 187 Figure C-6Air Particulate - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LCS, 2005 - 2009.

Figure C-7Air Particulate - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LCS, 2005 - 2009.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2009 Table D-2ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2009 Table D-3DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2009 Table D-4ERA Statistical Summary Proficiency Testing Program Environmental, Inc., 2009 Table D-5DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Environmental, Inc., 2009 Appendix EEffluent Data Appendix FMeteorological Data Appendix GAnnual Radiological Groundwater Protection Program Report (ARGPPR)iv 5of187 I.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 2009 through 31 December 2009. During that time period, 1,454 analyses were performed on 1,355 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of LCS had no adverse radiological impact on the environment.

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

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

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

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

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

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

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

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

1 6of187 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 2009 through 31 December 2009.

A.Objectives 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 Environmental Inc. (Midwest Labs). This section describes the general 7of187 collection methods used by Environmental Inc. (Midwest Labs) to obtain environmental samples for the LCS REMP in 2009. 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 local representative species 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.

-3 8 of 187 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-101, L-102, L-103, L-104, L-105, L-106, L-107, L-108, L-109, L-110, L-111 B, L-112, L-113A, L-114, L-1 15 and L-1 16) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off

-site doses) from 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 9of187 samples for radioactivity for the LCS REMP in 2009. 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 187 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 2009 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-0801/22/09No apparent reason for low reading of 162.1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .

AllL-0503/05/09No apparent reason for low reading of 89.7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months .AllL-1003/05/09No apparent reason for low reading of 159.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months .

A/IL-0503/19/09No apparent reason for low reading of 139.1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .

6 11 of 187 Table D-1LISTING OF SAMPLE ANOMALIES (continued)

SampleLocationCollectionReason TypeCodeDate A/IL-0503/26/09No apparent reason for low reading of 147.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . Collector will monitor timer for possible replacement.

A/IL-0504/02/09Estimated reading of 169.0 hours0 days 0 hours 0 weeks 0 months ; collector placed new timer.

A/IL-0306/11/09Low reading of 141.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months due to planned power outage.

AllL-0306/18/09Low reading of 71.0 hours0 days 0 hours 0 weeks 0 months due to recent power restoration.

A/IL-0307/02/09No apparent reason for low reading of 168.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months (8-day run).

A/IL-0307/09/09Low reading of 157.4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months possibly due to construction in area.

A/IL-0507/09/09Low reading of 158.4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months possibly due to construction in area.

A/IL-0307/16/09Low reading of 147.8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months possibly due to construction in area.

A/IL-0507/16/09Low reading of 150.1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months possibly due to construction in area.

A/IL-0307/23/09Low reading of 155.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months possibly due to construction in area.

A/IL-0507/23/09Low reading of 149.0 hours0 days 0 hours 0 weeks 0 months possibly due to construction in area.

A/IL-0307/30/09Low reading of 155.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months possibly due to construction in area.

A/IL-0611/19/09No apparent reason for low reading of 162.0 hours0 days 0 hours 0 weeks 0 months .

A/IL-0112/03/09No apparent reason for low reading of 174.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months (8-day run).

7 12 of 187 Table D-1LISTING OF SAMPLE ANOMALIES (continued)

SampleLocationCollectionReason TypeCodeDate AllL-0612/23/09 No apparent reason for low reading of 71.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months .Table D-2LISTING OF MISSED SAMPLES SampleLocationCollectionReason TypeCodeDate WWL-2701/08/09Collector will obtain well water on 01/15/09.

WWL-2801/08/09Well #6 out of service; collector will obtain well water on 01/15/09.

SWL-2101/15/09No sample; water frozen.

SWL-4001/15/09No sample; water frozen.

WWL-2701/15/09Collector will obtain well water on 01/22/09.

WWL-2801/15/09Well #6 out of service; collector will obtain well water on 01/22/09.

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 2009.

IV.Results and Discussion A.Aquatic Environment 1.Surface Water Samples were taken weekly and composited monthly at two 13 of 187 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 5.6 to 10.2 pCi/I. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C). The required LLD was met.

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium was detected in two of eight samples with a range of 164 to 180 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. 14 of 187 3.Fish Fish samples comprising the flesh of local representative species 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 sample locations and ranged from 2,130 to 4,530 pCi/

kg wet. No fission or activation products were found.

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

Gamma Spectrometry Sediment samples from all sediment sample 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 sample locations and ranged from 11,800 to 17,900 pCi/kg dry. Cs-137 was found in one sample at a concentration of 86 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 15 of 187 site (L-01 and L-06), Group III (far field) represents the control location at an intermediate distance from LCS (L-04, L-07, L-08 and L-1 1) and Group IV (Control) represents the control location at a remote distance (L-10).

The following analyses were performed:

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

Detectable gross beta activity was observed at all locations.

Comparison of results among the four groups aid in determining the effects, if any, resulting from the operation of LCS. The results from the OnSite locations (Group I) ranged from 8 to 39 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3. The results from the near site location (Group II) ranged from 8 to 58 E-3 pCi/m3 with a mean of 20 E-3 pCi/m3. The results from the far field locations (Group III) ranged from 8 to 49 E-3 pCi/m3 with a mean of 21 E-3 pCi/m3. The results from the Control location (Group IV) ranged from 8 to 44 E-3 pCi/m3 with a mean of 21 E-3 pCi/m3. Comparison of the 2009 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 2009 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 33 of 36 samples. These values ranged from 66 to 218 E-3 pCi/m3. Naturally occurring K-40 was detected in three of 36 samples and ranged from 5.5 to 6.7 E-3 pCi/m3.

All other nuclides were less than the MDC.

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

No nuclides were detected, and all required LLDs were met. 16 of 187 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-VII.1, Appendix C). No nuclides were detected, and all required LLDs were met.

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

Naturally occurring K-40 activity was found in all samples and ranged from 1,100 to 1,370 pCi/I. No other nuclides were detected, and all required LLDs were met.

b.Food Products Food product samples were collected at five locations (L-Quad C, L-Quad 1, L-Quad 2, L-Quad 3 and L-Quad 4) when available.

Four locations, (L-Quad 1, L-Quad 2, L-Quad 3 and L-Quad 4) could be affected by LaSalle's effluent releases.

The following analysis was performed:

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

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

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

Most TLD measurements were below 30 mR/standard month, with a range of 19 to 35 mR/quarter. A comparison of the Inner Ring, Outer 17 of 187 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 2009 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 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-MWSW1.51.5-N W1.53.0-PWNW0.93.0-Q NW1.84.0-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: 18 of 187 1.Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of laboratory results and Analytics' known value. Since flag values are not assigned by Analytics, TBE-ES evaluates the reported ratios based on internal QC requirements, which are based on the DOE MAPEP criteria.

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

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

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

For the primary laboratory, 17 out of 18 analytes met the specified acceptance criteria.

One sample did not meet the specified acceptance criteria for the following reason:

Teledyne Brown Engineering's Analytics June 2009 Zn-65 in AP result of 137 pCi/L was higher than the known value of 101 pCi/L, resulting in a found to known ratio of 1.36. NCR 09-23 was initiated to investigate this failure. The failure appears to be a result of a slightly high bias on Detector 7. A recount on Detector 17 resulted in a Zn-65 result of 101 pCi/L. The detector has been tagged out-of-service until a recalibration can be performed.

Detector 7 is not used for client samples. 19 of 187 For the secondary laboratory, Environmental, Inc., 11 out of 14 analytes met the specified acceptance criteria. Four samples did not meet the specified acceptance criteria for the following reasons:

1.Environmental Inc.'s ERA April 2009 Cs-137 in water result of 147.7 pCi/L exceeded the lower control limit of 151.0 pCi/L. All gamma emitters showed a low bias. A large plastic burr found on the base of the Marinelli kept the beaker from sitting directly on the detector.Recounting in a different beaker gave an acceptable result of 155.33 +/- 14.55 pCi/L.

2.Environmental Inc.'s ERA April 2009 H-3 in water result of 22819 pCi/L exceeded the upper control limit of 22300 pCi/L. A recount of the original vials averaged 23,009 pCi/L. Reanalysis results were acceptable at 19,170 pCi/L. No cause could be found for the failure.3.Environmental Inc.'s MAPEP January 2009 Sr-90 in AP result of 0.93 exceeded the upper control limit of 0.83. Reanalysis results were acceptable at 0.54 +/- 0.12 Bq/filter. No cause could be found for the failure.

4.Environmental Inc.'s MAPEP July 2009 Sr-90 in soil result of 310.5 Bq/kg exceeded the lower control limit of 319 Bq/kg. Reanalysis results were acceptable at 363.3 Bq/kg. Incomplete separation of strontium from calcium could result in a higher recovery percentage and consequently lower reported activity.

The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data. 20 of 187 APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2009 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2009 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

FOR THE LASALLE COUNTY STATION, 2009 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES ILREPORTING PERIOD:ANNUAL 2009 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

LOCATIONS LOCATION MEDIUM ORTYPES OFNUMBER OF REQUIREDMEAN (M)MEAN (M)MEAN (M)STATION #NUMBER OF PATHWAY SAMPLEDANALYSISANALYSIS LOWER LIMIT (F)(F)(F)NAMENONROUTINE (UNIT OFPERFORMEDPERFORMED OF DETECTION RANGERANGERANGEDISTANCE AND DIRECTIONREPORTED MEASUREMENT)(LLD)MEASUREMENTS LA-14015<LLD<LLD FISHGAMMA12 (PCUKG WET)MN-54130<LLD<LLD CO-58130<LLD<LLD FE-59260<LLD<LLD CO-60130<LLD<LLD ZN-65260<LLD<LLD NB-95NA<LLD<LLD 0 0 0 0 0 0 0 c.n FISH (PCI/KG WET) 00 J NA<LLD<LLD ZR-95 0*THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2009 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES ILREPORTING PERIOD:ANNUAL 2009 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 CS-134130<LLD<LLD CS-137150<LLD<LLD BA-140NA<LLD<LLD LA-140NA<LLD<LLD SEDIMENTGAMMA6 (PCI/KG DRY)MN-54NA<LLD<LLD CO-58NA<LLD<LLD FE-59NA<LLD<LLD SEDIMENTCO-60NA<LLD<LLD (PCUKG DRY)

ZN-65 NA<LLD<LLD THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F) 0 0 0 0 0 0 0 0 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2009 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373&50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2009 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 NB-95NA<LLD<LLD ZR-95NA<LLD<LLD CS-134150<LLD<LLD CS-137180<LLD8686L-21 CONTROL (1/2)(1/2)ILLINOIS RIVER AT SENECA - UPSTREAM

FOR THE LASALLE COUNTY STATION, 2009 NAME OF FACILI TY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES ILREPORTING PERIOD:ANNUAL 2009 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<LLD 0 NB-95NANA<LLD-0 ZR-95NANA<LLD 0 CS-13415NA<LLD-0CS-13718NABA-14060NALA-14015NA W O VEGETATIONGAMMA10 (PCI/KG WET)MN-54NA<LLD<LLD 00 J*THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

MILK (PCULITER) 0<LLD 0<LLD<LLD 0 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2009 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES ILREPORTING PERIOD:ANNUAL 2009 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 CO-58NA<LLD<LLD FE-59 NA<LLD<LLD CO-60NA<LLD<LLD ZN-65NA<LLD<LLD NB-95NA<LLD<LLD ZR-95NA<LLD<LLD 0 0 0 0 0 0 VEGETATION (PC[/KG WET) 60<LLD<LLD 1-131 0 0CS-13460<LLD<LLDCS-13780<LLD<LLD*THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F) 0 TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2009 NAME OF FACILITY:LASALLEDOCKET NUMBER:50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES ILREPORTING PERIOD:ANNUAL 2009 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 BA-140NA<LLD<LLD LA-140NA<LLD<LLD DIRECT RADIATIONTLD-QUARTERLY336NA25.622.829L-2I 1-1 INDICATOR (MILLI-ROENTGEN/QTR.)(328/328)(8/8)(4/4)(19/35)(19/28)(25/33)4.5 MILES WSW 0 0 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)

APPENDIX B LOCATION DESIGNATION, DISTANCE

&DIRECTION, AND SAMPLE COLLECTION

&ANALYTICAL METHODS 33 of 187 TABLE B-1:Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2009 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

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 187 TABLE B-2:Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2009 Sample Medium Analysis Sampling Method Analytical Procedure Number Surface Water Gamma Monthly composite TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy from weekly grab samples.Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Surface Water Gross Beta Monthly composite TBE, TBE-2008 Gross Alpha and/or gross beta activity in from weekly grab various matrices samples.Env. Inc., W(DS)-01 Determination of gross alpha and/or gross beta in water (dissolved solids or total residue)

Surface Water Tritium Quarterly composite TBE, TBE-2011 Tritium analysis in drinking water by liquid from weekly grab scintillation samples.Env. Inc., T-02 Determination of tritium in water (direct method)Ground/Well Water Gamma Quarterly grab TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy samples.Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Ground/Well Water Tritium Quarterly grab TBE, TBE-2011 Tritium analysis in drinking water by liquid samples.scintillation Env. Inc., T-02 Determination of tritium in water (direct method)Fish Gamma Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis Spectroscopy collected via electroshocking or Env. Inc., GS-01 Determination of gamma emitters by other techniques gamma spectroscopy Sediment Gamma Semi-annual grab TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy samples Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Particulates Gross Beta One-week composite TBE, TBE-2008 Gross Alpha and/or gross beta activity in of continuous air various matrices sampling through glass fiber filter paper Env. Inc., AP-02 Determination of gross alpha and/or toss beta in air particulate filters Air Particulates Gamma Quarterly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy each station Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Iodine Gamma Bi-weekly composite of TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy continuous air sampling through Env. Inc., 1-131-02 Determination of 1-131 in charcoal charcoal filter canisters 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 Bi-weekly grab sample TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy when cows are on pasture.Monthly all Env. Inc., GS-01 Determination of gamma emitters by other times gamma spectroscopy Food Products Gamma Annual grab samples.

TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Env. Inc., GS-01 Determination of gamma emitters by gamma s ectrosco TLD Thermoluminescence Quarterly TLDs Global Dosimetry Dosimetry comprised of two Global Dosimetry CaF2 elements.B-336 of 187 UU6t*u#0 ^rrar. w i 0 EtDL V n Figure B-1 Inner Ring TLD Locations of the LaSalle County Station, 2009 I i B-437 of 187 Figure B-2 Outer Ring TLD Locations of the LaSalle County Station, 2009 B-538 of 187 tk l1Ia &ER1IatY Figure B-3 Fixed Air Sampling Locations of the LaSalle County Station, 2009 B-639 of 187 Tim kms,%ms airFtsh K Milk Sediment Figure B-4 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2009 B-740 of 187 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, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTIONL-21L-40 PERIOD 01/08/09 - 01/29/0910 +/- 2.4 (1) 8.7 +/- 2.3 (1)02/05/09 - 02/26/096.7 +/- 2.38.9 +/- 2.5 03/05/09 - 03/26/097.9 +/- 2.38.4 +/- 2.4 04/02/09 - 04/30/098.7 +/- 2.46.9 +/- 2.3 05/07/09 - 05/28/095.6 +/- 2.35.6 +/- 2.3 06/04/09-06/24/097.4 +/- 2.37.2 +/- 2.3 07/02/09 - 07/30/096.5 +/- 2.47.3 +/- 2.4 08/06/09 - 08/27/096.7 +/- 2.37.8 +/- 2.4 09/03/09 - 09/24/096.6 +/- 2.35.6 +/- 2.3 10/01/09 - 10/29/096.1+/- 2.36.3 +/- 2.5 11/05/09 - 11/25/095.9 +/- 2.26.7 +/- 2.2 12/03/09 - 12/30/095.9 +/- 2.37.0 +/- 2.4 MEAN7.0 +/- 2.77.2 +/- 2.2 TABLE C-1.2CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTIONL-21L-40 PERIOD 01/08/09 - 03/26/09< 179(1)< 179(1)04/02/09 - 06/24/09164 +/- 98< 142 07/02/09 - 09/24/09< 167< 174 10/61/09 - 12/30/09< 174180 +/- 113 MEAN164 +/-0180 +/-0*MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1)SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-142 of 187 TABLE C-1.3CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-951-131Cs-134 Cs-137Ba-140La-140 PERIOD L-2101/08/09 - 01/29/09< 1 (1) < 2< 4< 1< 3< 2< 3< 12< 1< 1< 17< 502/05/09 - 02/26/09< 2< 2< 4< 2< 3< 2< 3< 13< 2< 2< 21< 603/05/09 - 03/26/09< 1< 1< 2< 1< 1< 1< 1< 9< 1< 1< 27< 904/02/09 - 04/30/09< 1< 1< 2< 1< 1< 1< 1< 12< 1< 1< 14< 405/07/09 - 05/28/09< 1< 1< 2< 1< 2< 1< 2< 13< 1< 1< 15< 506/04/09 - 06/24/09< 1< 1< 3< 1< 3< 2< 3< 10< 1< 1< 15< 507/02/09 - 07/30/09< 2< 2< 4< 2< 4< 2< 3< 11< 2< 2< 18< 608/06/09 - 08/27/09< 1< 1< 2< 1< 1< 1< 2< 13< 1< 1< 16< 409/03/09 - 09/24/09< 2< 3< 4< 2< 4< 3< 4< 14< 2< 2< 25< 610/01/09 - 10/29/09< 1< 1< 3< 1< 2< 1< 2< 8< 1< 1< 13< 411/05/09 - 11/25/09< 1< 1< 2< 1< 1< 1< 2< 9< 1< 1< 12< 412/03/09 - 12/30/09< 1< 1< 3< 1< 2< 1< 2< 7< 1< 1< 23< 8 MEAN L-40 01/08/09 02/05/09 03/05/09 04/02/09 05/07/09 06/04/09 07/02/09 08/06/09 09/03/09 10/01/09 11/05/09 12/03/09 MEAN 01/29/09<2 (1) <3<5<2<4<2<4<15<2<2<23<8 02/26/09<2<2<4<2<3<2<3<13<2<2<21<6 03/26/09<1<1<3<1<1<1<2<9<1<1<37<12 04/30/09<1<1<2<1<2<1<2<14<1<1<16<5 05/28/09<1<1<2<1<2<1<2<13<1<1<15<5 06/24/09<1<2<3<1<3<2<3<11<1<1<17<5 07/30/09<2<3<6<3<5<3<5<15<2<3<26<10 08/27/09<1<2<4<1<3<2<3<12<1<1<27<8 09/24/09<2<2<5<2<4<2<4<13<2<2<22<7 10/29/09<1<2<4<1<3<2<3<9<1<1<16<5 11/25/09<1<1<2<1<2<1<1<9<1<1<12<4 12/30/09<1<1<3<1<2<1<3<7<1<1<27<9 C 00 (1)SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION TABLE C-I1.1CONCENTRATIONS OF TRITIUM IN GROUND

/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTIONL-27L-28-W4*L-28-W5*L-28-W6*PERIOD 01/22/09 - 01/22/09< 181 (1)< 179 (1)< 180 (1)04/09/09 - 04/09/09< 184< 185< 182 07/09/09 - 07/09/09< 124< 123< 124 10/08/09 - 10/08/09< 176< 167< 175 MEAN*THERE ARE THREE WELLS ASSOCIATED WITH LOCATION L-28 (1)SEE PROGRAM EXCEPTIONS SECTIONS FOR EXPLANATION C-344 of 187 TABLE C-II.2CONCENTRATIONS OF GAMMA EMITTERS IN GROUND

/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-2701/22/09 - 01/22/09< 3< 3< 6< 3< 5< 3< 5< 2< 3< 24< 904/09/09 - 04/09/09< 2< 2< 4< 2< 3< 2< 4< 1< 2< 21< 707/09/09 - 07/09/09< 2< 2< 5< 2< 4< 2< 4< 2< 2< 23< 710/08/09 - 10/08/09< 3< 3< 8< 4< 8< 4< 7< 3< 4< 26< 8 MEANL-28-W4*04/09/09 - 04/09/09< 2< 2< 5< 1< 3< 2< 3< 2< 2< 22< 710/08/09 - 10/08/09< 4< 4< 9< 5< 8< 4< 8< 4< 4< 24< 9 MEAN L-28-W5*01/22/09 - 01/22/09 (1)

< 2 07/09/09 - 07/09/09< 2 MEAN<2<3<2<5<3<5<2<2<23<8<2<5<3<4<2<4<2<2<21<7< 3< 5< 2< 5< 3< 5< 2< 3< 28< 1004/09/09 - 04/09/09< 1< 1< 3< 1< 3< 1< 3< 1< 1< 19< 507/09/09 - 07/09/09< 2< 2< 5< 2< 4< 2< 3< 2< 2< 19< 710/08/09 - 10/08/09< 4< 4< 8< 5< 9< 5< 8< 4< 4< 31< 8 MEAN*THERE ARE THREE WELLS ASSOCIATED WITH LOCATION L-28 (1)SEE PROGRAM EXCEPTIONS SECTIONS FOR EXPLANATION TABLE C-111.1CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PC/KG WET +/- 2 SIGMA STC COLLECTION Mn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-34 Channel Catfish05/06/09< 57< 76< 259< 65< 120< 96< 158< 59< 67< 2640< 576 Largemouth Bass 05/06/09< 61< 80< 198< 42< 150< 77< 129< 57< 56< 2530< 641 Blue Catfish10/13/09< 49< 52< 156< 67< 138< 72< 113< 56< 52< 1020< 381 Common Carp10/13/09< 45< 73< 157< 59< 91< 70< 124< 51< 47< 1050< 331 MEAN L-35 Channel Catfish05/06/09< 47< 55< 178< 42< 108< 61< 114< 28< 45< 1980< 447 Freshwater Drum05/06/09< 43< 52< 128< 28< 98< 61< 106< 36< 42< 1810< 535 Channel Catfish10/13/09< 54< 71< 163< 62< 138< 72< 112< 53< 54< 947< 219 Smallmouth Buffalo 10/13/09< 88< 97< 247< 87< 168< 114< 183< 90< 97< 1620< 457 MEAN L-36 Freshwater Drum05/06/09< 41< 48< 106< 46< 98< 32< 101< 41< 39< 1480< 406 Smallmouth Buffalo 05/06/09< 52< 65< 181< 52< 116< 82< 114< 42< 52< 1950< 594 Largemouth Bass 10/13/09< 49< 68< 143< 60< 111< 85< 137< 53< 53< 1240< 274 Smallmouth Buffalo 10/13/09< 63< 85< 157< 67< 141< 99< 147< 63< 63< 1160< 238 MEAN TABLE C-IV.1CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PC/KG DRY +/- 2 SIGMA STC COLLECTION Mn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-21 05/07/09< 54< 80< 170< 53< 124< 75< 132< 51< 66< 1210< 292 10/08/09< 79< 92< 178< 82< 161< 90< 155< 6686 +/- 45 < 594< 158 MEAN--------86 +/- 0 L-40 05/07/09< 46< 57< 145< 48< 111< 65< 106< 37< 52< 885< 248 10/08/09< 61< 62< 136< 61< 144< 66< 102< 54< 66< 438< 91 MEAN L-41 05/07/09< 36< 47< 102< 32< 87< 52< 82< 36< 42< 746< 134 10/08/09< 108< 73< 261< 77< 197< 115< 176< 84< 117< 597< 115 MEAN MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES L8I JO 817L-3 NOLLVNV1dX3 2304 SNOI103S SNOI1d3OX3 WVeI9O2ld 33S (L)

S3fl1VA 3AIJISOd 3H1 JNISf a31vlnoivo 32iV S3fl1VA NOI-VIA30 aHVONViS Z GNV NV2W9L+ 29L+ OZ9L+ I.Z9I.+2L6+Oz 86+039L+Oz9L+ 2'LT-O3Md3Wt, T 9Zf'+9Zt,+ 9Zf +6Zt,+ 9Zt,+ LZti +LEt,+ LEt,+ 8Z60/0E/ZL-60/EZ/ZL9 + LE9 + 6E9 + Ltl9 + 0t,9 + 9E (L) 3L + 899 + LE9 + tiE9 + 9E60/EZ/ZL-60/LL/ZL9 + t1t,9 + 8£9 + 3t'9 + Et,t,+ EEt,+ t'Ef+ 8E9 + 6Et,+ 8E60/LL/3L-60/OL/ZI9 + LZ9 + L69 + OZf+9Lt,'+ LL9 + 6L9 + tiZ9 '+ L4ti +tlL60/0L/ZL-60/E0/ZL9 + LZti +9Zt,+ EZt'+ Z3t,+ L3t,+ OZ (L) 9 + 3Zt+ EZf+tlz60/E0/ZL-60/9Z/LL9 + 339 + OZ9 + LZ9 + £Z9 + OZ9 T 8L5 + ZZ5 + 8L9 + 9360/9Z4 L - 60/6L/LLf,;8Lt,+ 6Lt,+ 9Lti +8Lti+ t,L (L) t, + Elf'8Lt,EIt,+ L660/66/66-60/ZL/LL9 T LZ9+ 9L9+ t'39+ EZ9+ 3Z9+ 969Z39OZ9tlZ60/Z L/ L L

-60/90/ 6 6t,+ t'Lt,+ 8Lti +8Lt,+ 8Lf +6Lt,+ 91ti + OZt,+ 8L9 + ZZ60/90/66-60/6Z/OLt,$ 66t,+ 9Lti +OZt,+ L6t,+ 9Lt,+ 86t,+ 86t,+ LZt'+ 9L60/63/06-60/63/06t,+ LL9 + OZ9 + 969 + OZ9 + 869 + 969 + L65 + 969 + L660/63/06-60/96/06t,+ 96t,+ L6ti +96t,+ 9Lt,+ L6t,+I.ti + L6ti +96t,+ 9L60/96/06-60/80/06t,+ 0 Lt, T 8ti+ 6t,+ 8t,+ 8t,+ 6t,+ 0 LJ7 T- 8J7 T- 0 L60/80/0 L- 60/0£/609 + LL9 + LL9 + 8L9 ; 9L9 + t'L9 + OZ9 + 9L9 + 9L9 + LZ60/0£/60 - 60/tZ/609 + 839 '+ t739 + tl39 + EZ9 + ZZ9 + 9Z9 T LE9 + EZ9 + LZ60/tZ/60 - 601L L/609 + OE9 + 9Z9 + LE9 '+ tl39 + 839 + 6Z9 + EE9 + 939 + 8Z601L L/60 - 60/0L/609 + OE9 + 9E9 + EE9 + LE9 + OE9 T LE9 + LZ9 + OE9 + t8 60/0L/60 - 60/E0/60t, T 8 Lt,+ 9 Lti T E Lti T L Lt,+ OZt, T-E Lt,+ E Lt, T- L Lt, T E L60/E0/60 - 60/LZ/80 EOLE + LLti +t'Lti T LLti +9LE + 0LE + 8t,+ Z6t,+ EL60/LZ/80 - 60/6L/80j, + 9L9 + EZ9 + LZ9 T 939 T 29 + 9Zti + EL9 + 539 + EZ 60/6L/80 - 60/ZL/809+ 3Z9+ 6 L9+ 6 L9+ OZ9+ 6 L9+ 6 L9+ L L9+ OZ9+ 6 L60/Z L/90 - 60/90/80t,+ Z L9 '+ 9 Lt, T-tlL9+ 9 Lt,'+ 3 L9; L L9+ 6 Lt,+ tl Lt, T-Z L60/90/80 - 60/08/L09 + 9Et'+ LL9 + OE9 + LZ9 + L39 + t'39 + ZZ9 + 9Z (6) 5 + 6L60/0E/LO - 60/8Z/L0t,+ LLt,+ 9Lt,+ LLt,+ 9L9 + EZt,+ 9Lt,+ LL (L) 9 + 9L (L) t, + fL60/EZ/L0 - 60/9L/L05 + ZZ9 + L39 + L39 + Z3t,+ 91t,+ 8 L9 + CZ (L) 9 + ZZ (L) 98 L60/9 L/L0 - 60/60/LOt+ELV+tlIt,+OLti+tiLt,+EL9+LL9+LL(L) 9+ 9L (L) b+0L60/60/L0 - 60/Z0/LO t,tlLt,+ 3 Lt,+ 9 Lt'+ L Lt,+ Z Lt,+ I.I.t,+ E Lt'+ 9 L (L) V + L L60/Z0/LO - 60/tiZ/909 EZ9 + 29 + 3Z9 + L3V + LL9 + 8L5 + LL9 + 9Eti +8L60/tiZ/90 - 60/8L/90t,+ OLt+ L6t,+ ELt,+ LLt,+ ELt,+ ZLt'+ 6t,+ LL (L) 9 + 8L60/8L/90 - 60/LL/90E + t'LE + 9LE T 9LE '+ LLE + ELE + t, LE + t'LE + LL (L) E + 9L60/LL/90 - 60/t,0/90t, T 3Lt,'+ ELt,+ ELt,+ 9Lti + 9Lti + 9Lti + tlLt,+ 96t+ EL60/90/90 - 60/83/90t, T 96ti $ 8Lt,+ 6Lt,+ LLt,'+ 96t'+I.t,+ 8Lf+ LLti + 9L60/83/90 - 60/0Z/S0 t,+ 8f+ 3 Lt,+ tl Lf+ L Lti+ L Lti+ L Lt,+ f' L9+ 9 Lt,+ 0 L60/03/90 - 603,U90t,+ E Lt,+ 0 Lt,+ L Lt,+ Z Lt,+ 0 Lt,+ tlLt,+ 0 Lb + 6t,+ 660/t' L/90

-60/LO/S09 + ZZt,+ 8L9 + 9Zt,+ 8L9 + 9Z9 + EZ9 + ZZ9 + 935 + ZZ60/L0/90 - 60/0010t,+ 3Lti +9Lt'+ 9Lt,'+ ELt'+ 3Lt'+ LLE + OLj + I.ti +EL60/OE/t0 - 60/ZZ/b0V + 6Lt,+ LLti + 869 + LZ9 + OZti + I.t, T I.t,+ 9Lt,+ 8L60/ZZ/t0 - 60/9L/fOt,+ LLt,+ 9Lf+ 9Lti + 9L9 + 8Lt,+ t'Lj7 + 9Lt'+ 3Lt+ 9L60/9L/fO - 60/60/tOt, T 6 Lt,+ 9 Lt,+ L Lt,+ 9 Lt,+ E It,+ 9 Lt,+ 8 Lt'+ 91t, T- t' L60/60/t'O-60/Z0/t,0t,+I.t,+I.f+8Lt,+ 9Lt,+ ELt,+ 9Lb + I. (L) ti +ELti + LL60/ZO/tO - 60/9Z/CO9 + Z3t,'+ OZ9 + LZt,+ 8 Lt,+ 6 L9 + LZ9 + EZ (L) 9 + OZt'+ 8 L60/9Z/CO - 60/6 KO9 + 9Z9 + EZ9 + ZZ9 '+ 6Z9 + Z39 + tl39 + 93 (L) 9 + LE9 + ZZ 60/6 MO - MUMt,+I.t,+ ELti +9L9 '+ 6Lt,+ ELf+ LL9 + 8L9 + 6L9 + OZ60/Z M0 - 60/9O/E0(L)9 + 9Zt,+ OZt,+ Z3t,+ LZ9 + 6Z9 + EZ9 + CZ (L) 8 + LEt'+ OZ60/90/CO - 60/9Z/ZO9 + ZE9 + LZ9 + LE9 + EE9 + 9Z9 + LE9 + LZ9 + LZ9 + LE60/9Z/ZO - 60/6L/ZOt,+ OZt,'+ LZt'+ LZt,+ ZZti +8 Lt,+ EZf +6 Lti +OZt'+ 8 L60/6 L/ZO - 60/W Z09 + LZ9 + ZE9 + ZEV + OZ9 + 6t,9 + LZ9 + 939 + 939 + LE60/ZL/ZO - 60/90/ZOt,+ OZt,+ LLti +L3V '+ 2t,+ L3ti +OZt,+ OZti +2ti + LL60/90/ZO - 60/6Z409 T. EE9 + OE9 + 9E9 + t'E9 + Ot,9 + SE9 + 9E9 + SE9 + LE60/6Z4O - 60/33/LO9 + LE9 + 6E9 + 6E9 + 9E9 + LE9 + 9E9 + OE9 + 5E9 + LE60/ZZ/60 - 60/9L/LO9 + OE9 + 839 + 8Z9 + tlz5 + 6Z9 + LZ5 + LZ5 + 835 + LZ60/9L/LO - 60/80/LO9 6Z9 + OE (L) 9 + Ob9 + OE9 + OE9 + OE9 + LZ9 + LZ9 + 9360/8040 - 80/LE/ZL OL-1LL--l80-1LO-1t'0-l90-1L0-190-1E0-lQOI ltd Al dflO23JIII dflO23OII dflOHOI dflO2iDN011031100 VWJIS Z T 21313A no/IOd C-3 :AO SlJNfl NI S11fS32H 6002 `NOIUVIS AlNfOO 311VSV1 :10 AIINIOIA 3H1 NI a31O31103 S31dINVS 31vlnOlIUVd 211V NI V139 SSO21J d0 SNOIIVUIN3ONO3VA-O 319V1 TABLE C-V.2MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMAGROUP II - FAR-FIELD LOCATIONSGROUP III - FAR-FIELD LOCATIONSGROUP IV - CONTROL LOCATIONCOLLECTIONMIN MAX MEAN

+/-COLLECTIONMIN MAX MEAN

+/-COLLECTIONMIN MAX MEAN +/-PERIOD2SDPERIOD2SDPERIOD2SDPERIOD2SD/31/08 - 01/29/0926 3530 +/- 712/31/0801/29/09 - 02/26/0917 3124 +/- 1101/29/0902/26/09 - 04/02/0911 37 21 +/- 1502/26/0904/02/09 - 04/30/0912 1815 +/- 404/02/0904/30/09 - 05/28/099 25 15 +/- 1204/30/0905/28/09 - 07/02/0911 36 16 +/- 1505/28/0907/02/09 - 07/30/0910 25 17 +/- 1007/02/0907/30/09 - 09/03/0912 25 17 +/- 907/30/0909/03/09 - 09/30/0915 34 25 +/- 1209/03/0909/30/09 - 10/29/098 2115 +/- 809/30/0910/29/09 - 12/03/0913 25 20 +/- 810/29/0912/03/09 - 12/30/0914 39 29 +/- 1912/03/09 01/29/09 02/26/09 04/02/09 04/30/09 05/28/09 07/02/09 07/30/09 09/03/09 09/30/09 10/29/09 12/03/09 12/30/09 27 35 31 +/- 812/31/08 19 3124 +/- 901/29/09 14 25 20 +/- 802/26/09 10 18 14 +/- 504/02/09 10 23 15 +/- 904/30/09 9 18 14 +/- 605/28/09 15 24 19 +/- 707/02/09 8 26 15 +/- 1007/30/09 15 37 27 +/- 1509/03/09 9 18 15 +/- 709/30/09 13 22 19 +/- 610/29/09 19 58 33 +/- 2412/03/09 01/29/09 02/26/09 04/02/09 04/30/09 05/28/09 07/02/09 07/30/09 09/03/09 09/30/09 10/29/09 12/03/09 12/30/09 24 40 33 +/- 1012/31/08 17 49 26 +/- 1601/29/09 12 29 19 +/- 1002/26/09 12 2116 +/- 504/02/09 10 26 15 +/- 1004/30/09 11 22 15 +/- 705/28/09 10 30 19 +/- 1007/02/09 11 25 17 +/- 807/30/09 14 36 25 +/- 1309/03/09 8 20 15 +/- 909/30/09 14 25 20 +/- 710/29/09 11 43 30 +/- 2112/03/09 01/9 2 09 29 37 32 +/- 7 02/26/0920 32 25 +/- 11 04/02/0914 26 21 +/- 12 04/30/0912 1917 +/- 7 05/28/098 22 15 +/- 12 07/02/0910 23 15 +/- 10 07/30/0913 35 22 +/- 19 09/03/0910 2216 +/- 10 09/30/0917 30 26 +/- 13 10/29/0910 1914 +/- 8 12/03/0914 27 20 +/- 10 12/30/0921 44 32 +/- 21 12/31/08 - 12/30/098 39 20 +/- 1512/31/08 - 12/30/098 58 20 +/- 1612/31/08 - 12/30/098 49 21 +/- 1612/31/08 - 12/30/098 4421 +/- 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, 2009 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-0112/31/08 - 04/02/09< 3< 5< 21< 3< 7< 7< 11< 3< 2< 933< 47004/02/09 - 07/02/09< 1< 3< 15< 0.4< 1< 3< 5< 0.4< 0.4< 55600< 1760007/02/09 - 09/30/09< 2< 6< 29< 2< 6< 8< 11< 2< 2< 9910< 249009/30/09 - 12/30/09< 3< 5< 16< 3< 11< 6< 10< 4< 3< 560< 220 MEAN L-0312/31/08 - 04/02/09< 3< 6< 16< 3< 7< 5< 9< 3< 2< 780< 238< 1< 2< 4< 0.3< 0.3< 43900< 1630004/02/09 - 07/02/09< 0.5< 2< 12< 0.407/02/09 - 09/30/09< 4< 10< 50< 4< 13< 13< 21< 4< 3< 15000< 485009/30/09 - 12/30/09< 2< 5< 21< 3< 8< 9< 10< 2< 1< 696< 318 MEAN L-0412/31/08 - 04/02/09< 3< 6< 17< 3< 8< 7< 13< 3< 3< 860< 410<1< 3< 5< 0.4< 0.4< 57700< 2140004/02/09 - 07/02/09< 1< 2< 14< 0.407/02/09 - 09/30/09< 2< 7< 27< 2< 7< 7< 13< 2< 2< 7950< 337009/30/09 - 12/30/09< 4< 10< 28< 6< 13< 9< 11< 4< 5< 875< 527 MEAN L-0512/31/08 - 04/02/09< 3< 7< 20< 3< 7< 6< 10< 3< 3< 1040< 40804/02/09 - 07/02/09< 1< 2< 13< 0.4< 1< 3< 5< 0.4< 0.4< 49100< 2000007/02/09 - 09/30/09< 5< 12< 50< 4< 10< 10< 21< 3< 3< 13000< 376009/30/09 - 12/30/09< 4< 7< 18< 4< 11< 7< 14< 4< 4< 957< 275 MEAN TABLE C-V.3CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-0612/31/08 - 04/02/09< 4< 4< 12< 3< 8< 6< 12< 3< 3< 1080< 36004/02/09 - 07/02/09< 0.5< 2< 12< 0.3< 1< 2< 4< 0.3< 0.3< 44000< 1640007/02/09 - 09/30/09< 3< 7< 33< 3< 9< 10< 17< 3< 2< 6910< 511009/30/09 - 12/30/09< 2< 4< 16< 1< 3< 4< 7< 2< 2< 551< 131 MEAN L-0712/31/08 - 04/02/09< 2< 4< 17< 4< 6< 6< 10< 3< 2< 838< 25004/02/09 - 07/02/09< 0.2< 1< 6< 0.2< 1< 1< 2< 0.2< 0.2< 22400< 813007/02/09 - 09/30/09< 5< 11< 54< 2< 11< 16< 28< 5< 4< 18200< 600009/30/09 - 12/30/09< 6< 8< 27< 4< 13< 8< 16< 5< 4< 865< 371 MEAN L-0812/31/08 - 04/02/09< 3< 6< 29< 4< 12< 8< 11< 4< 4< 1500< 41104/02/09 - 07/02/09< 0.4< 2< 10< 0.3< 1< 2< 4< 0.3< 0.3< 39100< 1470007/02/09 - 09/30/09< 3< 11< 49< 5< 7< 13< 17< 4< 4< 12500< 369009/30/09 - 12/30/09< 6< 10< 27< 4< 11< 9< 17< 5< 5< 859< 302 MEAN L-1012/31/08 - 04/02/09< 3< 6< 24< 2< 8< 5< 10< 3< 3< 1050< 48404/02/09 - 07/02/09< 0.4< 2< 12< 0.4< 1< 2< 4< 0.3< 0.3< 42000< 1680007/02/09 - 09/30/09< 3< 8< 39< 2< 7< 7< 14< 3< 3< 10900< 331009/30/09 - 12/30/09< 5< 7< 22< 4< 12< 7< 12< 4< 4< 929< 248 MEAN TABLE C-V.3CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STCCOLLECTIONMn-54Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD L-1112/31/08 - 04/02/09< 3< 6< 16< 2< 6< 5< 10< 3< 3< 1010< 22404/02/09 - 07/02/09< 0.4< 2< 11< 0.4< 1< 2< 4< 0.3< 0.3< 46100< 1850007/02/09 - 09/30/09< 5< 12< 53< 3< 11< 16< 23< 4< 3< 14800< 529009/30/09 - 12/30/09< 2< 4< 8< 2< 3< 4< 6< 2< 1< 395< 79 MEAN TABLE C-VI.1CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTIONGROUP IIGROUP II1GROUP IIII GROUP IV PERIODL-03L-05L-01L-06L-04L-07L-08L-11L-10 12/31/08 - 01/08/09< 39< 39< 21< 39< 39< 63< 63 (1)< 63< 63 01/08/09 - 01/15/09< 42< 42< 21< 42< 42< 36< 36< 36< 36 01/15/09 - 01/22/09< 11< 20< 20< 20< 20< 18< 19< 18< 18 01/22/09 - 01/29/09< 61< 62< 34< 61< 61< 57< 58< 58< 58 01/29/09 - 02/05/09< 57< 59< 60< 60< 36< 61< 61< 63< 63 02/05/09 - 02/12/09< 36< 36< 18< 36< 34< 35< 34< 33< 34 02/12/09 - 02/19/09< 16< 9< 16< 16< 17< 24< 24< 23< 24 02/19/09 - 02/26/09< 41< 41< 20< 41< 41< 39< 39< 39< 38 02/26/09 - 03/05/09< 14< 26 (1)< 14< 8< 14< 14< 13< 13< 14(1)03/05/09 - 03/12/09< 16< 16< 9< 16< 16< 13< 13< 13< 13 03/12/09 - 03/19/09< 46< 57 (1)< 47< 47< 47< 32< 48< 48< 48 03/19/09 - 03/26/09< 40< 46 (1)< 22< 40< 40< 49< 50< 50< 50 03/26/09 - 04/02/09< 23< 23 (1)< 23< 66< 23< 68< 41< 67< 67 04/02/09 - 04/09/09< 69< 69< 43< 68< 68< 63< 61< 63< 61 04/09/09 - 04/16/09< 45< 45< 45< 41< 45< 42< 42< 41< 23 04/16/09 - 04/22/09< 61< 61< 34< 61< 61< 63< 62< 62< 62 04/22/09 - 04/30/09< 66< 66< 66< 64< 66< 57< 57< 45< 57 04/30/09 - 05/07/09< 68< 68< 38< 67< 67< 63< 60< 62< 62 05/07/09 - 05/14/09< 57< 58< 45< 57< 57< 68< 68< 68< 68 05/14/09 - 05/20/09< 51< 51< 41< 48< 51< 62< 61< 61< 61 05/20/09 - 05/28/09< 36< 65< 65< 65< 65< 59< 59< 58< 58 05/28/09 - 06/05/09< 59< 60< 25< 59< 59< 37< 38< 64< 38 06/04/09 - 06/11/09< 66 (1)< 56< 55< 34< 30< 51< 51< 50< 50 06/11/09 - 06/18/09< 67 (1)< 47< 47< 23< 46< 38< 39< 38< 39 06/18/09 - 06/24/09< 62< 28< 62< 62< 34< 62< 67< 67< 67 06/24/09 - 07/02/09< 36 (1)< 67< 67< 66< 67< 34< 34< 34< 34 07/02/09 - 07/09/09< 59 (1)< 59 (1)< 55< 30< 55< 55< 54< 54< 54 07/09/09 - 07/16/09< 49 (1)< 21 (1)< 45< 44< 45< 44< 44< 24< 44 07/16/09 - 07/23/09< 55 (1)< 32 (1)< 51< 51< 51< 29<69< 68< 69 07/23/09 - 07/30/09< 19 (1)< 33< 33< 33< 33< 45< 45< 44< 44 07/30/09 - 08/06/09< 25< 25< 25< 34< 25< 18< 35< 35< 35 08/06/09 - 08/12/09< 65< 65< 36< 65< 65< 55< 70< 70< 70 08/12/09 - 08/19/09< 47< 47< 47< 50< 47< 50< 50< 50< 27 08/19/09 - 08/27/09< 54< 55< 55< 57< 55< 25< 58< 58< 58 08/27/09 - 09/03/09< 30< 55< 55< 55< 55< 57< 57< 24< 57 09/03/09 - 09/10/09< 31< 31< 31< 24< 31< 26< 14< 25< 25 09/10/09 - 09/17/09< 48< 48< 27< 47< 49< 62< 62< 62< 62 09/17/09 - 09/24/09< 63< 64< 64< 64< 36< 70<69< 69< 69 09/24/09 - 09/30/09< 19< 35< 35< 34< 35< 58< 58< 57< 57 09/30/09 - 10/08/09< 21< 21< 21< 39< 21< 17< 39< 39< 39 10/08/09 - 10/15/09< 29< 29< 29< 29< 29< 41< 41< 41< 41 10/15/09 - 10/21/09< 45< 45< 25< 45< 45< 68< 68< 68< 68 10/21/09 - 10/29/09< 48< 26< 47< 47< 47< 39< 39< 39< 39 10/29/09 - 11/05/09< 45< 44< 19< 45< 44< 57< 56< 56< 56 11/05/09 - 11/12/09< 46< 47< 46< 25< 46< 67< 67< 66< 67 11/12/09 - 11/19/09< 17< 17< 17< 13 (1)< 17< 38< 38< 38< 38 11/19/09 - 11/25/09< 52< 52< 52< 56< 52< 31< 56< 56< 56 11/25/09 - 12/03/09< 61< 61< 29 (1)< 62< 60< 46< 46< 45< 45 12/03/09 - 12/10/09< 58< 59< 59< 60< 58< 61< 34< 61< 61 12/10/09 - 12/17/09< 65< 28< 65< 65< 65< 51< 51< 51< 51 12/17/09 - 12/23/09< 61< 61< 60< 52 (1)< 60< 42< 42< 41< 41 12/23/09 - 12/30/09< 63< 66< 66< 65< 40< 43< 45< 45< 45 MEAN (1) SEE PROGRAM EXCEPTIONS SECTIONS FOR EXPLANATIONC-1253 of 187 TABLE C-VII.1CONCENTRATIONS OF 1-131 IN MILK SAMPLES IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD CONTROL FARM L-42 01/01/09< 0.8 02/05/09< 0.8 03/05/09< 0.6 04/02/09< 0.6 05/07/09< 0.6 05/20/09< 0.4 06/04/09< 0.8 06/18/09< 0.8 07/02/09< 0.5 07/16/09< 0.7 07/30/09< 0.7 08/12/09< 0.4 08/27/09< 0.6 09/10/09< 0.8 09/24/09< 0.7 10/08/09< 0.6 10/21/09< 0.7 11/05/09< 0.6 12/03/09< 0.5 MEAN C-1354 of 187 C 00 TABLE C-VII.2CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION Mn-54 Co-58Fe-59Co-60Zn-65Nb-95Zr-95Cs-134Cs-137Ba-140La-140 PERIOD<4<5<13<5<10<5<8<4<4<43<1202/05/09<2<2<6<2<4<2<4<2<2<19<603/05/09<7<7<17<7<17<7<13<7<6<48<1104/02/09<4<5<13<5<11<5<9<4<5<38<1305/07/09<2<3<7<2<5<3<4<2<2<43<1405/20/09< 7< 8< 15< 6< 15< 8< 10< 6< 7< 54< 1506/04/09<3<3<7<3<7<3<5<3<3<22<606/18/09<4<4<12<4<10<5<8<4<4<40<1007/02/09<4<5<11<4<9<5<9<4<4<39<1107/16/09<4<4<11<4<8<4<8<3<4<25<907/30/09<4<5<12<5<10<5<9<4<4<43<1008/12/09<4<4<9<3<9<4<5<2<3<24<1108/27/09<6<6<15<7<14<7<10<6<7<30<909/10/09<6<7<15<7<17<7<12<6<7<28<1009/24/09<5<5<11<5<12<6<10<5<6<30<710/08/09<4<6<14<6<12<7<11<5<5<35<1310/21/09<4<5<10<5<10<4<8<4<5<22<711/05/09<7<8-<18<10<15<8<15<7<8<46<1412/03/09<5<5<14<5<12<6<10<5<5<45<13 MEAN TABLE C-VIII.1CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 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 Cabbage09/12/09< 13< 13< 27< 10< 22< 13< 23< 31< 10< 12< 72< 22 Onions09/12/09< 11< 12< 33< 10< 31< 15< 22< 36< 11< 13< 76< 19 MEAN L-QUAD 1 Broccoli09/10/09< 18< 17< 40< 22< 37< 21< 24< 54< 18< 17< 120< 28 Cabbage09/10/09< 16< 14< 36< 15< 32< 15< 26< 39< 13< 14< 89< 33 MEAN L-QUAD 2 Cabbage09/10/09< 13< 18< 41< 19< 31< 18< 34< 41< 13< 15< 88< 31 Horseradish 09/10/09< 16< 16< 39< 18< 40< 18< 28< 42< 15< 16< 89< 21 MEAN L-QUAD 3 Broccoli09/12/09< 15< 13< 33< 15< 34< 17< 29< 36< 12< 16< 85< 23 Cabbage09/12/09< 15< 16< 31< 15< 32< 20< 30< 46< 14< 16< 105< 25 MEAN L-QUAD 4 Cabbage09/12/09< 11< 12<26< 13< 27< 11<21< 30< 9< 11< 69< 16 Onions09/12/09< 9< 10< 22<10< 21< 10< 16< 25< 8< 10< 64< 15 MEAN TABLE C-IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATIONMEANJAN - MARAPR - JUNJUL - SEPOCT -DEC CODE L-01-126.0 +/- 7.128232330 L-01-226.3 +/- 5.027232629 L-03-125.5 +/- 6.225232430 L-03-225.3 +/- 5.527242228 L-04-123.3 +/- 5.024232026 L-04-224.0 +/- 7.524232029 L-05-124.3 +/- 4.724262126 L-05-223.8 +/- 4.124242126 L-06-127.0 +/- 6.728262331 L-06-225.0 +/- 8.524242131 L-07-124.0 +/- 3.725222326 L-07-224.3 +/- 6.823242129 L-08-124.3 +/- 6.226242027 L-08-225.3 +/- 7.924222431 L-10-123.5 +/- 7.423241928 L-10-222.0 +/- 7.122201927 L-11-122.3 +/- 4.122202225 L-11-221.5 +/- 5.322201925 L-101-128.0 +/- 5.927322528 L-101-227.0+/- 4.325272630 L-102-128.0 +/- 1029242435 L-102-226.3 +/- 5.727242430 L-103-125.8 +/- 5.725242430 L-103-226.5+/-5.325272430 L-104-125.0 +/- 5.427262126 L-104-224.8 +/- 5.725252128 L-105-128.3 +/- 6.630262532 L-105-226.3 +/- 6.226282229 L-106-125.8 +/- 7.225232431 L-106-225.3 +/- 6.626252129 L-107-126.8 +/- 6.227242531 L-107-225.8 +/- 7.225232431 L-108-125.8+/-7.728232230 L-108-223.0 +/- 7.126211926 L-109-125.5 +/- 5.325272228 L-109-227.0 +/- 7.127242532 L-110-126.8 +/- 4.426242928 L-110-226.8 +/- 6.028262330 L-112-124.8 +/- 7.223242230 L-112-225.5 +/- 5.025232529 L-114-125.8 +/- 6.025272229 L-114-226.5 +/- 3.528252528 L-115-123.8 +/- 4.724222227 L-115-225.0+/-8.228222129 L-116-124.0 +/- 4.324232227 L-116-223.5 +/- 5.824232027 L-201-321.8 +/- 3.422212024 L-201-424.8 +/- 2.525252326 L-202-324.0 +/- 7.124212229 L-202-423.8 +/- 7.722202429 L-203-125.3 +/- 8.424252131 L-203-225.5 +/- 4.824252429 C-1657 of 187 TABLE C-IX.1 QUARTERLY TLD RESULTS FOR LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATIONMEANJAN - MARAPR - JUNJUL - SEPOCT -DEC CODE L-204-127.0 +/- 5.927262431 L-204-225.5 +/- 5.825262229 L-205-125.3 +/- 2.524252527 L-205-227.0 +/- 7.825282332 L-205-326.0 +/- 3.326262428 L-205-425.0 +/- 8.525222231 L-206-126.0 +/- 6.725272230 L-206-226.0 +/- 2.825262528 L-207-125.8 +/- 5.724242530 L-207-225.0 +/- 7.722262230 L-208-125.8 +/- 8.525232332 L-208-227.8 +/- 4.726282631 L-209-126.3 +/- 7.025282230 L-209-225.3 +/- 7.924242231 L-210-127.8 +/- 6.628242732 L-210-227.5 +/- 6.625252832 L-211-129.0 +/- 6.529252933 L-211-228.8 +/- 6.028282633 L-212-124.8 +/- 5.025242228 L-212-226.3 +/- 4.425272429 L-213-325.0 +/- 2.824252427 L-213-425.0 +/- 1.624262525 L-214-324.5 +/- 3.524242327 L-214-424.3 +/- 5.724242128 L-215-327.3 +/- 8.728252333 L-215-427.5 +/- 5.326282531 L-216-327.3 +/- 1.928282726 L-216-425.3 +/- 6.825242230 L-11113-126.8 +/- 4.725252730 L-111 B-227.3 +/- 6.627252532 L-113A-127.0 +/- 8.825292232 L-113A-227.0 +/- 6.726282331 C-1758 of 187 TABLE C-IX.2MEAN QUARTERLY TLD RESULTS FOR THE INNER RING, OUTER RING, OTHER AND CONTROL LOCATIONS FOR LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF MILLI-ROETGEN/QUARTER +/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTIONINNER RINGOUTER RINGOTHERCONTROL PERIOD+/- 2 S.D.JAN-MAR26.0 +/- 3.225.1 +/- 3.424.8 +/- 3.822.5 +/- 1.4 APR-JUN25.0 +/- 4.625.1 +/- 4.223.2 +/- 3.422.0 +/- 5.7 JUL-SEP23.3 +/- 4.323.7 +/- 4.221.9 +/- 3.719.0 +/- 0.0 OCT-DEC29.5 +/- 4.029.5 +/- 4.728.1 +/- 4.427.5 +/- 1.4 TABLE C-IX.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATIONSAMPLES PERIODPERIODPERIOD MEAN ANALYZED MINIMUM MAXIMUM+/- 2 S.D.INNER RING128193526.0 +/- 6.1 OUTER RING136203325.8 +/- 6.0 OTHER64193124.5 +/- 6.0 CONTROL8192822.8 +/- 6.9 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 187 FIGURE C-1Surface Water - Gross Beta - Stations L

-21 (C) and L-40 Collected in the Vicinity of LCS, 2000 - 2004 L-21 (C)Illinois River at Seneca 2A +01-0 1-00:2-31-D12-31 4Y12-at-02'12-3&04, L-40 Illinois River Downstream C-1960 of 187 FIGURE C-1 (cont.)Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LCS, 2005 - 2009 L-21 (C)Illinois River at Seneca J U a 2.0+0.0I11I1I 01-27-0501-22-0601-17-0701-12-0801-06-0901-01-10 L-40 Illinois River Downstream U a 01-27-0501-22-0601-17-0701-12-0801-06-0901-01-10 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-2061 of 187 FIGURE C-2Surface Water - Tritium - Stations L-21 (C)and L-40 Collected in the Vicinity of LCS, 2000 - 2004 L-21( ) Illinois R i ver at Seneca Q 12-31-0 0 1231-01 12-31-0-7 12,,,11-03 L-40 Illinois River Downstream C-2162 of 187 FIGURE C-2 (cont.)Surface Water - Tritium - Stations L

-21 (C) and L-40 Collected in the Vicinity of LCS, 2005 - 2009 L-21 Illinois River at Seneca 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 187 FIGURE C-3 Air Particulate - Gross Beta - Stations L

-01 and L-03 Collected in the Vicinity of LCS, 2000 - 2004 L-O1 Nearsite No, I 1O 12-3:1 -01 12-113-04 12-31-03 1-03 Ons to No. 3 01 &71.CG114%31 O11 2, 3 t-0212-31-M12-30.04 C-2364 of 187 FIGURE C-3 (cont.)

Air Particulate - Gross Beta -Stations L-01 and L-03 Collected in the Vicinity of LCS, 2005 - 2009 L-01 Nearsite No. 1 i 0.0 4 01-06-0501-05-0601-04-0701-03-0801-01-0912-31-09 L-03 Onsite No. 3 01-06-0501-05-06 01-04-0701-03-08}01-01-0912-31-09 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-2465 of 187 FIGURE C-4 Air Particulate - Gross Beta - Stations L

-05 and L-06 Collected in the Vicinity of LCS, 2000 - 2004 Onsite No. 5 D.011-01-W L-06 N e a rsite N o.11-10-0 11 2-31-00 1i-a1-11 12.31=Q 12.113-Q4 C-2566 of 187 FIGURE C-4 (cont.)

Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LCS, 2005 - 2009 L-05 Onsite No. 5 50.0 r 0 0.0 01-06-0501-05-0601-04-0701-03-0801-01-0912-31-09 L-06 Nearsite No. 6 DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCUM3 TO E-03 PCI/M3 C-2667 of 187 FIGURE C-5 Air Particulate - Gross Beta - Station L-10 (C)

Collected in the Vicinity of LCS, 2000 - 2004 L-10 (C) Streator 1010-, 8.0 y 12-1!2<<;s4 O4 C-2768 of 187 FIGURE C-5 (cont.)Air Particulate - Gross Beta - Station L-10 (C)

Collected in the Vicinity of LCS, 2005 - 2009 L-1 0 (C)Streator DUE TO VENDOR CHANGE IN 2005, THE REPORTED UNITS CHANGED FROM E-02 PCI/M3 TO E-03 PCI/M3 C-2869 of 187 FIGURE C-6 Air Particulate - Gross Beta - Stations L

-04 and L-07 Collected in the Vicinity of LCS, 2005 - 2009 L-04 Rte. 170 60.0 t 50.0+40.030.020.0 10.0 0.0IIFII11 07-07-0504-06-0601-04-0710-04-0707-03-0804-02-0912-31-09 L-07 Seneca 50.0 r 40.0 30.0 20.0 10.0 0.0IIIIIII 07-07-0504-06-0601-04-0710-04-0707-03-0804-02-0912-31-09 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 2005C-2970 of 187 FIGURE C-7 Air Particulate - Gross Beta -Stations L-08 and L-11 Collected in the Vicinity of LCS, 2005 - 2009 L-08 Marseilles 50.0 r 40.0 +30.0 t U CL M*IM I I I 0.0 iIII1II 07-07-0504-06-0601-04-0710-04-0707-03-0804-02-0912-31-09 L-11 Ransom 60.0 r 50.0+07-07-0504-06-0601-04-0710-04-0707-03-0804-02-0912-31-09 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 1 C-3071 of 187 APPENDIX D INTER-LABORATORY COMPARISON PROGRAM TABLE D-1ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2009 (PAGE 1 OF 3)

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

March 2009E6533-396MilkSr-89pCi/L10297.71.04A Sr-90pCi/L14.915.60.96A E6534-396Milk1-131pCi/L66.779.30.84A Ce-141pCi/L87.594.90.92A Cr-51pCi/L2753050.90A Cs-134pCi/L82.093.70.88A Cs-137pCi/L1111111.00A Co-58pCi/L1141190.96A Mn-54pCi/L1361281.06A Fe-59pCi/L11299.91.12A Zn-65pCi/L1601561.03A Co-60pCi/L1421421.00A E6536-396APCe-141pCi1201151.04A Cr-51pCi3853711.04A Cs-134pCi1131140.99A Cs-137pCi1491351.10A Co-58pCi1531451.06A Mn-54pCi1551551.00A Fe-59pCi1181210.98A Zn-65pCi1951891.03A Co-60pCi1901731.10A E6535-396Charcoal 1-131pCi82.879.41.04A June 2009E6742-396MilkSr-89pCi/L1071120.96A Sr-90pCi/L19.016.71.14A E6743-396Milk1-131pCi/L98.1102.00.96A Ce-141pCi/L2602840.92A Cr-51pCi/L3894000.97A Cs-134pCi/L144.01660.87A Cs-137pCi/L1851920.96A Co-58pCi/L86.991.90.95A Mn-54pCi/L1331370.97A Fe-59pCi/L1261221.03A Zn-65pCi/L1731750.99A Co-60pCi/L2983120.96A E6745-396APCe-141pCi1861631.14A Cr-51pCi2622311.13A Cs-134pCi101951.06A Cs-137pCi1351111.22W Co-58pCi61531.16A Mn-54pCi83.1791.05A Fe-59pCi84701.19A Zn-65pCi1371011.36N (1)Co-60pCi2021801.12A E6744-396Charcoal 1-131pCi92.295.80.96A D-173 of 187 TABLE D-1ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2009 (PAGE 2 OF 3)

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

September 2009 E6897-396MilkSr-89pCi/L1131071.06A Sr-90pCi/L17.418.80.93A E6898-396Milk1-131pCi/L89.298.60.90A Ce-141pCi/L2492750.91A Cr-51pCi/L2132210.96A Cs-134pCi/L104.01230.85A Cs-137pCi/L1721850.93A Co-58pCi/L96.399.40.97A Mn-54pCi/L2012060.98A Fe-59pCi/L1541471.05A Zn-65pCi/L2132041.04A Co-60pCi/L1541600.96A E6900-396APCe-141pCi1811611.12A Cr-51pCi1451301.12A Cs-134pCi71.8720.99A Cs-137pCi1151091.06A Co-58pCi62581.06A Mn-54pCi1291211.07A Fe-59pCi97980.98A Zn-65pCi1101200.92A Co-60pCi98.794.11.05A E6899-396Charcoal 1-131pCi89.592.30.97A December 2009 E6946

-396MilkSr-89pCi/L1311311.00A Sr-90pCi/L19.317.91.08A E6947-396Milk1-131pCi/L79.287.30.91A Ce-141pCi/L1932020.96A Cr-51pCi/L5125480.93A Cs-134pCi/L2222530.88A Cs-137pCi/L1631790.91A Co-58pCi/L2002110.95A Mn-54pCi/L1781781.00A Fe-59pCi/L1761780.99A Zn-65pCi/L3263450.94A Co-60pCi/L2402560.94A E6949-396APCe-141pCi1031031.00A Cr-51pCi2902801.04A Cs-134pCi1161290.90A Cs-137pCi93.491.51.02A Co-58pCi1111081.03A Mn-54pCi81.090.80.89A Fe-59pCi10690.81.17A Zn-65pCi1551760.88A Co-60pCi1351311.03A TABLE D-1ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2009 (PAGE 3 OF 3)

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

December 2009 E6948-396Charcoal 1-131pCi93.393.90.99A (1)Detector 7 appears to have a slightly high bias.Detector 7 was removed from service until it can be recalibrated.

NCR 09-23 (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 187 TABLE D-2ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2009 (PAGE 1 OF 1)

IdentificationReportedKnown Month/YearNumberMediaNuclideUnitsValue (a)Value (b)Control Limits Evaluation (c)

April 2009RAD 77WaterSr-89pCi/L57.448.337.8-55.7N (1)Sr-90pCi/L30.631.422.9-36.4A Ba-133pCi/L55.252.743.4-58.3A Cs-134pCi/L65.872.959.5-80.2A Cs-137pCi/L157168151-187A Co-60pCi/L86.488.980.0 - 100A Zn-65pCi/L85.584.476.0 - 101A Gr-ApCi/L47.754.228.3-67.7A Gr-BpCi/L45.243.529.1 - 50.8A 1-131pCi/L25.226.121.7-30.8A H-3pCi/L197332030017800 - 22300A October 2009RAD 79WaterSr-89pCi/L64.7562.250.2-70.1A Sr-90pCi/L30.3030.722.4-35.6A Ba-133pCi/L97.992.978.3 - 102A Cs-134pCi/L76.879.465.0-87.3A Cs-137pCi/L59.954.649.1 - 62.9A Co-60pCi/L121117105-131A Zn-65pCi/L11599.589.6 - 119A Gr-ApCi/L19.623.211.6-31.1A Gr-BpCi/L28.526.016.2-33.9A 1-131pCi/L22.122.218.4-26.5A H-3pCi/L161331640014300 - 18000A (1)Calculation did not allow for Y-90 ingrowth on the Sr-89 mount. NCR 09-14 (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 187 TABLE D-3DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2009 (PAGE 1 OF 2)

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

March 200909-MaW20WaterCs-134Bq/L18.822.518.5-29.3A Cs-137Bq/L0.0601(1)A Co-57Bq/L17.018.913.2-24.6A Co-60Bq/L16.117.2112.05 - 22.37A H-3Bq/L332330.9231.6 - 430.2A Mn-54Bq/L13.814.710.26 - 19.06A Sr-90Bq/L6.887.215.05- 9.37A Zn-65Bq/L13.213.69.5-17.7A 09-GrW20WaterGr-ABq/L0.5290.635>0.0 - 1.270A Gr-BBq/L1.871.270.64-1.91A 09-MaS20SoilCs-134Bq/kg433467327 - 607A Cs-137Bq/kg649605424 - 787A Co-57Bq/kg-0.120(1)A Co-60Bq/kg3.914.113(2)A Mn-54Bq/kg339307215 - 399A K-40Bq/kg644570399 - 741A Sr-90Bq/kg245257180 - 334A Zn-65Bq/kg272242169 - 315A 09-RdF20APCs-134Bq/sample2.772.932.05-3.81A Cs-137Bq/sample1.411.521.06-1.98A Co-57Bq/sample1.241.300.91-1.69A Co-60Bq/sample1.331.220.85-1.59A Mn-54Bq/sample2.422.2709 1.5898 - 2.9522A Sr-90Bq/sample 0.7130.640.448 - 0.832A Zn-65Bq/sample1.301.360.95-1.77A 09-GrF20APGr-ABq/sample 0.1880.348>0.0 - 0.696A Gr-BBq/sample 0.3130.2790.140 - 0.419A March 200909-RdV20Vegetation Cs-134Bq/sample3.483.402.38-4.42A Cs-137Bq/sample1.150.930.65-1.21W Co-57Bq/sample3.122.361.65-3.07N (3)Co-60Bq/sample -0

.0105(1)A Mn-54Bq/sample2.982.31.61-2.99W K-40Bq/sample64.1(4)Sr-90Bq/sample1.091.2600.882 - 1.638A Zn-65Bq/sample1.731.35400.948 - 1.760W September 2009 09-MaW21WaterCs-134Bq/L26.532.222.5-41.9A Cs-137Bq/L37.241.228.8-53.6A Co-57Bq/L32.236.625.6-47.6A Co-60Bq/L14.015.4010.8-20.0A H-3Bq/L705634.1443.9 - 824.3A Mn-54Bq/L-0.1015(1)A Sr-90Bq/L13.912.999.09- 16.89A Zn-65Bq/L26.226.918.8-35.0A 09-GrW21WaterGr-ABq/L1.271.047>0.0 - 2.094A Gr-BBq/L9.707.533.77-11.30A D-577 of 187 TABLE D-3DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)TELEDYNE BROWN ENGINEERING, 2009 (PAGE 2 OF 2)

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

September 2009 09-MaS21 Soil Am-241 Cs-134 Cs-137 Co-57 Co-60 Mn-54 K-40 Sr-90 Zn-65 09-RdF21 AP Cs-134 Cs-137 Co-57 Co-60 M n-54 Sr-90 Zn-6509-GrF21APGr-A Gr-B Bq/kg74.789.862.9-116.7A Bq/kg0.554(1)A Bq/kg706669468 - 870A Bq/kg606586410 - 762A Bq/kg350327.000229 - 425A Bq/kg876796557 - 1035A Bq/kg425375263 - 488A Bq/kg505455319 - 592A Bq/kg13701178825 - 1531A Bq/sample-0.02(1)A Bq/sample1.41.40.98-1.82A Bq/sample5.986.484.54-8.42A Bq/sample1.011.030.72-1.34A Bq/sample5.165.493.84-7.14ABq/sample 0.9250.08350.585 - 1.086A Bq/sample4.393.932.75-5.11ABq/sample 0.3570.659>0.0 - 1.318ABq/sample 1.4031.3200.66-1.98A 09-RdV21Vegetation Cs-134Bq/sample -0.0027(1)A Cs-137Bq/sample2.362.431.70-3.16A Co-60Bq/sample2.582.571.80-3.34A Mn-54Bq/sample8.367.95.5-10.3A K-40Bq/sample57.8(4)Sr-90Bq/sample1.731.781.25-2.31A Zn-65Bq/sample-0.59(1)A (1)False positive test.

(2)Sensativity evaluation.

(3)Homogeniety problem.

MAPEP requires using entire sample but due to geometry limitations we can only use part of the sample.

NCR 09-13 (4)Not evaluated by MAPEP.(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 187 TABLE D-4 ERA (a)STATISTICAL

SUMMARY

PROFICIENCY TESTING PROGRAM ENVIRONMENTAL, INC., 2009 (Page 1 of 1)

Lab CodeDateAnalysis Laboratory Resultb Concentration (pCi/L)ERAControl ResultcLimits Acceptance STW-118104/06/09Sr-8941.0 +/- 5.8 STW-118104/06/09Sr-9032.4 +/- 2.4 STW-118204/06/09 Ba-13344.6 +/- 3.1 STW-118204/06/09 Co-6081.0 +/- 3.1 STW-1 18204/06/09 Cs-13465.6 +/- 5.2 STW-1182 ° 04/06/09Cs-137147.7 +/- 5.3 STW-118204/06/09 Zn-6579.8 +/- 7.5 STW-118304/06/09Gr. Alpha47.6 +/- 2.1 STW-118304/06/09Gr. Beta38.5 +/- 1.3 STW-118404/06/091-13124.4 +/- 2.5 STW-1186 e 04/06/09 H-322819.0 +/- 453.048.337.8-55.7Pass31.422.9-36.4Pass52.743.4 - 58.3Pass88.980.0-100.0Pass72.959.5-80.2Pass168.0151.0 - 187.0Fail84.476.0 -101.0Pass54.228.3-67.7Pass43.529.1 - 50.8Pass26.121.7-30.8Pass20300.017800.0 - 22300.0FailSTW-119310/05/09Sr-8953.0 +/- 6.0STW-119310/05/09Sr-9031.1 +/- 2.2STW-119410/05/09Ba-13382.5 +/- 3.5STW-119410/05/09Co-60116.8 +/- 3.3STW-119410/05/09 Cs-13478.8 +/- 5.7STW-119410/05/09 Cs-13754.2 +/- 3.7STW-119410/05/09 Zn-65102.5 +/- 6.2STW-119510/05/09Gr. Alpha20.3 +/- 2.0STW-119510/05/09Gr. Beta23.7 +/- 1.4STW-119610/05/091-13122.4 +/- 1.4STW-119810/05/09 H-317228.0 +/- 694.062.250.2-70.1Pass30.722.4-35.6Pass92.978.3 -102.0Pass117.0105.0 - 131.0Pass78.865.0 - 87.3Pass54.649.1 - 62.9Pass99.589.6-119.0Pass23.211.6-31.1Pass26.016.2 - 33.9Pass22.218.4-26.5Pass16400.014300.0 - 18000.0Pass a Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing in drinking water conducted by Environmental Resources Associates (ERA).b Unless otherwise indicated, the laboratory result is given as the mean +/- standard deviation for three determinations.

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

d All gamma -emitters showed a low bias. A large plastic burr found on the base of the Marinelli kept the beaker from sitting directly on the detector. Result of recount in a different beaker, Cs- 137, 155.33+/- 14.55 pCi/L.

Samples were recounted and also reanalyzed. A recount of the original vials averaged 23,009 pCi/L.Reanalysis results were acceptable, 19,170 pCi/L.

D-779 of 187 TABLE D-5DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEPr ENVIRONMENTAL, INC., 2009 (Page 1 of 2)

Concentration b Known Control Lab Code °DateAnalysis STW-117001/01/09 Co-57 STW-117001/01/09 Co-60 STW-117001/01/09 Cs-134 STW-1170 e 01/01/09Cs-137 STW-117001 /01 /09H-3 STW-117001 /01 /09 M n-54 STW-117001/01/09Sr-90 STW-117001 /01 /09 Zn-65 Laboratory result19.60 +/- 0.4016.60 +/- 0.30 20.40 +/- 0.500.10 +/- 0.20359.90 +/- 33.90 15.00 +/- 0.40 7.87 +/- 1.39 14.00 +/- 0.70 ActivityLimits d 18.9013.20 - 24.60 17.2112.05 - 22.37 22.5015.80 -29.30 0.000.00 - 1.00 330.90231.60 -430.20 14.6610.26 - 19.06 7.215.05-9.37 13.609.50 - 17.70 Acceptance Pass Pass Pass Pass Pass Pass Pass PassSTW-117101 /01 /09Gr. Alpha01 /01 /09Gr. Beta 0.56 +/- 0.06 1.29 +/- 0.050.640.00 -1.271.270.64-1.91 Pass Pass STSO-1172e 01/01/09Co-57 STSO-1172 01 /01 /09Cs-134 STSO-1172 01/01/09Cs-137 STSO-1172 01 /01 /09K-40 STSO-1172 01/01/09Mn-54 STSO-1172 01/01/09Sr-90 STSO-1172 01 /01 /09 Zn-65 STVE-1173 01/01/09 Co-57 STYE-1173 e 01 /01 /09Co-60 STVE-1173 01 /01 /09Cs-134 STVE-1173 01/01/09Cs-137 STVE-1173 01 /01 /09Mn-54 STVE-1173 01 /01 /09Zn-65 STAP-1 174 01 /01 /09Co-57 STAP-1174 01 /01 /09 Co-60 STAP-1174 01 /01 /09Cs-134 STAP-1174 01/01/09Cs-137 STAP-1174 01/01/09 Mn-54 STAP-1174 r 01/01/09Sr-90 STAP-1174 01 /01 /09 Zn-650.00 +/- 0.00458.60 +/- 7.40652.30 +/- 3.50636.40 +/- 9.50346.40 +/- 3.10180.60 +/- 12.10 268.30 +/- 4.00 2.75 +/- 0.11 0.06 +/- 0.09 3.49 +/- 0.22 1.01 +/- 0.11 2.52 +/- 0.14 1.52 +/- 0.18 1.25 +/- 0.05 1.17 +/- 0.06 2.67 +/- 0.14 1.53 +/- 0.08 2.34 +/- 0.09 0.93 +/- 0.14 1.44 +/- 0.140.000.00 - 1.00467.00327.00 - 607.00605.00424.00 - 787.00570.00360.40 - 669.40307.00215.00 -399.00257.00180.00 - 334.00242.00169.00 -315.002.361.65-3.070.000.00 -1.003.402.38-4.420.930.65-1.212.301.61 -2.991.350.95-1.761.300.91 -1.691.220.85-1.592.932.05-3.811.521.06-1.982.271.59-2.950.640.45-0.831.360.95-1.77 Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass PassFail PassGr. AlphaSTAP-1175 01/01/09Gr. Beta 0.22 +/- 0.03 0.36 +/- 0.040.350.00-0.700.280.14-0.42 Pass Pass STW-1 192 07/01/09 Co-57 STW-119207/01/09 Co-60 STW-119207/01/09 Cs-134 STW-119207/01/09 Cs-137 STW-119207/01/09H-3 STW-1192 e 07/01/09Mn-54 STW-119207/01/09 Sr-90 STW-1 19207/01/09 Zn-6537.20 +/- 1.5015.10 +/- 0.9030.30 +/- 2.10 41.90 +/- 1.80680.30 +/- 33.60 0.01 +/- 0.2612.90 +/- 1.70 28.50 +/- 2.4036.6025.60 - 47.6015.4010.80 - 20.0032.2022.50 -41.9041.2028.80 -53.60634.10443.90 -824.300.000.00 -1.0012.999.09 - 16.8926.9018.80 - 35.00 Pass Pass Pass Pass Pass Pass Pass Pass D-880 of 187 TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEPr ENVIRONMENTAL, INC., 2009 (Page 2 of 2)

Concentration Lab Code CDateAnalysis STW-119107/01/09Gr. Alpha STW-119107/01/09Gr. Beta STSO-1 188 07/01/09 Co-57 STSO-1188 07/01/09 Co-60 STSO-1188 07/01/09 Cs-134 STSO-1188 07/01/09 Cs-137 STSO-1188 07/01/09 K-40 STSO-1188 07/01/09 Mn-54 STSO-1188 g 07/01/09Sr-90 STSO-1188 07/01/09 Zn-65 STVE-1190 07/01/09 Co-57 STVE-1190 07/01/09 Co-60 STVE-1190 07/01/09 Cs-134 STVE-1190 07/01/09 Cs-137 STVE-1190 07/01/09 Mn-54 STVE-1190 07/01/09 Zn-65 STAP-1189 07/01/09Gr. Alpha STAP-1189 07/01/09Gr. Beta STAP-1190 07/01/09 Co-57 STAP-1 190 07/01/09 Co-60 STAP-1190 07/01/09 Cs-134 STAP-1190 07/01/09Cs-137 STAP-1190 07/01/09 Mn-54 STAP-1190 07/01/09 Sr-90 STAP-1190 07/01/09 Zn-65 KnownLaboratory resultActivity0.88 +/- 0.071.057.29 +/- 0.107.53674.60 +/- 9.00586.00356.40 +/- 6.30327.000.20 +/- 1.900.00767.50 +/- 12.00669.00433.00 +/- 37.20375.00931.60 +/- 14.10796.00310.50 +/- 12.20455.001433.90 +/- 25.201178.008.90 +/- 0.608.002.50 +/- 0.362.57 0.01 +/- 0.110.002.42 +/- 0.162.438.35 +/- 0.707.900.01 +/- 0.260.000.33 +/- 0.040.661.57 +/- 0.071.326.78 +/- 0.276.481.06 +/-0.181.030.01 +/- 0.060.001.49 +/- 0.271.406.00 +/- 0.455.490.79 +/- 0.130.844.55 +/- 0.663.93ControlLimits dAcceptance0.00-2.09Pass3.77 -11.30Pass410.00 -762.00Pass229.00 - 425.00Pass0.00 -1.00Pass468.00 - 870.00Pass263.00 - 488.00Pass557.00 - 1035.00Pass319.00 -592.00Fail825.00 - 1531.00Pass5.60 - 10.40Pass1.80-3.34Pass0.00 -0.10Pass1.70-3.16Pass5.50 - 10.30Pass0.00 -0.10Pass0.00 -1.32Pass0.66-1.98Pass4.54-8.42Pass0.72-1.34Pass0.01 - 0.05Pass0.98-1.82Pass3.84-7.14Pass0.59 -1.09Pass2.75 -5.11Pass 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).

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

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

No reason was determined for the initial high results. The analysis was repeated; result of reanalysis; 0.54 +/- 0.12 Bq/filter.

g Incomplete separation of strontium from calcium could result in a higher recovery percentage and consequently lower reported activity. The analysis was repeated; result of reanalysis 363.3 +/- 28.6 Bq/kg.D-981 of 187 APPENDIX E EFFLUENT DATA 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 .................................................................. 33.1.1.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................................................................... 4 3.1.2.1.Dose to Thyroid ......................................................... 5 3.2.Liquid Effluent Pathways....................................................................... 5 3.3.Assessment of Dose to Member of Public ............................................ 5 4.0.SITE METEOROLOGY ....................................................................................

6 i 83 of 187 Table of Contents (cont.)

APPENDIX E-1DATA TABLES AND FIGURES ............................................................. E-1.1 Station Releases Table 1.1-1 Gaseous Effluents Summation of all Releases ............................ E-1.2 Table 1.2-1 Liquid Effluents Summation of all Releases ................................. E-1.3 Table 2.0-1 Solid Radwaste Annual Report .................................................... E-1.4 Table 3.1-1 Maximum Doses Resulting from Airborne Releases .................... E-1.5 Table 3.2-1 Maximum Doses Resulting from Liquid Effluents .......................... E-1.9 Table 3.3.1 10CFR20 Compliance Assessment .............................................. E-1.13 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data ............................................. E-1.17 It 84 of 187 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 187

SUMMARY

Gaseous effluents for the period contributed to only a small fraction of the LaSalle County Station Radiological Effluent Controls Limits. Liquid effluents had no contribution to offsite dose, as no liquid radioactive discharges were conducted. Calculations of environmental concentrations based on effluent, Illinois River flow, and meteorological data for the period indicate that consumption by the public of radionuclides attributable to LaSalle County Station does not exceed regulatory limits.

Radiation exposure from radionuclides releases to the atmosphere represented the critical pathway for the period with a maximum individual total dose estimated to be 7.69E-02 mrem for the year, where a shielding and occupancy factor of 0.7 is assumed. The assessment of radiation doses is performed in accordance with the Offsite Dose Calculation Manual (ODCM), specifically, a comparison of preoperational studies with operational controls or with previous environmental surveillance reports and an assessment of the observed impacts of the plant operation on the environment.

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

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

2 86 of 187

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 4.01 E+03 curies of fission and activation gases were released with an average release rate of 1.26E+02 pCi/sec.

A total of 5.28E-02 curies of 1-131 was released during the year with an average release rate of 1.68E-03 pCi/sec.

A total of 1.62E-02 curies of beta-gamma emitters was released as airborne particulate matter with an average release rate of 5.11 E-04 pCi/sec. Alpha-emitting radionuclides were below the lower limit of detection (LLD).

A total of 5.90E+01 curies of tritium was released with an average release rate of 1.86E+00 pCi/sec.

1.2Liquids Released to Illinois River There were no liquid batch releases in 2009. 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 2009 Radioactive Effluent Release Report.

The submittal date of this report was April 28, 2010.

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 187 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 4.58E-02 mrem (Table 3.1-1) for the year, with an occupancy or shielding factor of 0.7 included. The maximum total body dose based on measured effluents and concurrent meteorological data would be 1.31 E-02 mrem. (Table 3.4-1).

The maximum gamma air dose was 6.06E-02 mrad (Table 3.1-1) and 5.48E-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 4.83E-02 (Table 3.1-1) and 1.68E-02 mrem (Table 3.4-1) based on concurrent meteorological data.

The maximum offsite beta dose for the year was 2.25E-03 mrad (Table 3.1-1) and 4.67E-03 mrad (Table 3.4-1) based on concurrent meteorological data.

3.1.2 Radioactive

Iodine The human thyroid exhibits a significant capacity to 4 88 of 187 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 7.69E-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, 2009, LaSalle County Station did not exceed these limits as shown in Table 3.1-1 and Table 3.2-1 (based on annual average meteorological data), and As shown in Table 3.3-1:The Radiological Effluent Technical Standards (RETS) limits on dose or dose commitment to an individual due to radioactive materials in liquid effluents from each reactor unit (1.5 mrem to the whole body or 5 mrem to any organ 5 89 of 187 during any calendar year; 3 mrem to the whole body or 10 mrem to any organ during the calendar year).The RETS limits on air dose in noble gases released in gaseous effluents to a member of the public from each reactor unit (5 mrad for gamma radiation or 10 mrad for beta radiation during any calendar quarter; 10 mrads for gamma radiation or 20 mrad for beta radiation during a calendar year).The RETS limits on dose to a member of the public due to iodine-131, iodine-133, tritium, and radionuclides in particulate form with half-lives greater than eight days in gaseous effluents released from each reactor unit (7.5 mrem to any organ during any calendar quarter; 15 mrem to any organ during any calendar year).The 10CFR20 limit on Total Effective Dose Equivalent to individual members of the public (100 mrem).

4.0 SITE METEOROLOGY A summary of the site meteorological measurements taken during each calendar quarter of the year is given in Appendix F. The data are presented as cumulative joint frequency distributions of the wind direction for the 375' level and wind speed class by atmospheric stability class determined from the temperature difference between the 375' and 33' levels.Data recovery for these measurements was 99.6% during 2009.

Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1) 6 90 of 187 APPENDIX E-1 DATA TABLES AND FIGURES Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2009)UNITS ONE AND TWO DOCKET NUMBERS 50-373 AND 50-374 GASSEOUS EFFLENTS SUMMATION OF ALL RELEASES Units 1st Qtr 4-111--Qtr 2nd Qtr 3rd Qtr Estimated Total Error %

A.Fission and Activation Gas Releases 1.Total Release Activity Ci 7.48E+02 4.58E+02 1.03E+03 1.77E+03 2.Average Release Rate uCi/sec 9.51 E+01 5.83E+01 1.30E+02 2.22E+02 3. Percent of Technical Specification Limit

%B.Iodine Releases 1.Total I-131 Activity Ci 2.03E-02 8.49E-03 1.20E-02 1.20E-02 2.Average Release Rate uCi/sec 2.59E-03 1.08E-03 1.52E-03 1.51 E-03 3. Percent of Technical Specification Limit

%****C.Particulate (> 8 day half-life) Releases 1.Gross Activity Ci 1.67E-03 1.14E-03 3.05E-03 1.03E-02 2.Average Release Rate uCi/sec 2.12E-04 1.46E-04 3.84E-04 1.30E-03 3. Percent of Technical Specification Limit

%3. Gross Alpha Activity Ci<1.OOE-11<1.OOE-11<1.00E-11<1.OOE-11 D.Tritium Releases 1.Total Release Activity Ci 1.14E+01 1.64E+01 1.31E+01 1.81E+01 2.Average Release Rate uCi/sec 1.45E+00 2.08E+00 1.64E+00 2.28E+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 187 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 (2009)

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

Units A.Fission and Activation Products 1.Total Activity Released Ci<LLD<LLD<LLD<LLD 2.Average Concentration Released uCi/ml<LLD<LLD<LLD<LLD 3. Percent of Applicable Limit

%****B.Tritium 1.Total Activity Released Ci<LLD<LLD<LLD<LLD 2.Average Concentration Released uCi/ml<LLD<LLD<LLD<LLD 3. Percent of Applicable Limit%***C.Dissolved Noble Gases 1.Total Activity Released Ci<LLD<LLD<LLD<LLD 2.Average Concentration Released uCi/ml<LLD<LLD<LLD<LLD 3. Percent of Applicable Limit%**D.Gross Alpha 1.Total Activity Released (estimate)

Ci<LLD<LLD<LLD<LLD 2.Average Concentration Released uCi/nl<LLD<LLD<LLD<LLD 3. Percent of Applicable Limit%***E. Volume of Liquid Waste to Dischargeliters 0.00E+00 0.00E+00 0.00E+00 0.00E+00N/A F. Volume of Dilution Water liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00N/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 187 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 2009 Effluent Report.

E-1.494 of 187 TYPE Table 3.1-1 LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASESPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 INFANT RECEPTOR 1ST2ND3RD4TH QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC GAMMA AIR9.66E-03 (MRAD)(WSW)BETA AIR4.23E-04 (MRAD)(ESE)TOT. BODY7.30E-03 (MREM)(WSW)SKIN7.74E-03 (MREM)(WSW)ORGAN1.40E-03 (MREM)(ESE)8.88E-031.44E-022.77E-026.06E-02 (WSW)(WSW)(WSW)(WSW)2.43E-045.16E-041.07E-032.25E-03 (ESE)(ESE)(ESE)(ESE)6.71E-031.09E-022.10E-024.58E-02 (WSW)(WSW)(WSW)(WSW)7.03E-031.14E-022.21E-024.83E-02 (WSW)(WSW)(WSW)(WSW)1.96E-023.03E-021.43E-026.56E-02 (ESE)(ESE)(ESE)(ESE)THYROIDTHYROIDTHYROID THYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10CFR 50 APP. I INFANT RECEPTOR

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

QTRLY OBJ GAMMA AIR (MRAD)5.0 BETA AIR (MRAD)10.0 TOT. BODY (MREM)2.5 SKIN (MREM)7.5 ORGAN (MREM)7.5 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY% OF JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. I0.190.180.290.5510.00.610.000.000.010.0120.00.010.290.270.430.845.00.920.100.090.150.3015.00.320.020.260.400.1915.00.44 THYROID THYROID THYROID THYROIDTHYROID RESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.595 of 187 Table 3.1-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASESPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 CHILD RECEPTOR 1ST TYPE QUARTER JAN-MAR GAMMA AIR9.66E-03 (MRAD)(WSW)BETA AIR4.23E-04 (MRAD)(ESE)TOT. BODY7.30E-03 (MREM)(WSW)SKIN7.74E-03 (MREM)(WSW)ORGAN1.21E-03 (MREM)(NNE)2ND3RD4TH QUARTERQUARTERQUARTERANNUAL APR-JUNJUL-SEPOCT-DEC 8.88E-031.44E-022.77E-026.06E-02 (WSW)(WSW)(WSW)(WSW)2.43E-045.16E-041.07E-032.25E-03 (ESE)(ESE)(ESE)(ESE)6.71E-031.09E-022.10E-024.58E-02 (WSW)(WSW)(WSW)(WSW)7.03E-031.14E-022.21E-024.83E-02 (WSW)(WSW)(WSW)(WSW)2.38E-023.48E-021.71E-027.69E-02 (NNE)(NNE)(NNE)(NNE)THYROIDTHYROIDTHYROID THYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10CFR 50 APP. I CHILD RECEPTOR

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

QTRLY OBJ GAMMA AIR (MRAD)5.0 BETA AIR (MRAD)10.0 TOT. BODY (MREM)2.5 SKIN (MREM)7.5 ORGAN (MREM)7.5 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OF JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. I0.190.180.290.5510.00.610.000.000.010.0120.00.010.290.270.430.845.00.920.100.090.150.3015.00.320.020.320.460.2315.00.51 THYROID THYROID THYROID THYROIDTHYROID RESULTS BASED UPON:ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.696 of 187 TYPE Table 3.1-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASESPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 TEENAGER RECEPTOR 1ST2ND3RD4TH QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC GAMMA AIR9.66E-03 (MRAD)(WSW)BETA AIR4.23E-04 (MRAD)(ESE)TOT. BODY7.30E-03 (MREM)(WSW)SKIN7.74E-03 (MREM)(WSW)ORGAN9.51E-04 (MREM)(NNE)8.88E-031.44E-022.77E-026.06E-02 (WSW)(WSW)(WSW)(WSW)2.43E-045.16E-041.07E-032.25E-03 (ESE)(ESE)(ESE)(ESE)6.71E-031.09E-022.10E-024.58E-02 (WSW)(WSW)(WSW)(WSW)7.03E-031.14E-022.21E-024.83E-02 (WSW)(WSW)(WSW)(WSW)1.49E-022.16E-021.10E-024.84E-02 (NNE)(NNE)(NNE)(NNE)THYROIDTHYROIDTHYROID THYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10CFR 50 APP. I TEENAGER RECEPTOR

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

QTRLY OBJ GAMMA AIR (MRAD)5.0 BETA AIR (MRAD)10.0 TOT. BODY (MREM)2.5 SKIN (MREM)7.5 ORGAN (MREM)7.5 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OF JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. I0.190.180.290.5510.00.610.000.000.010.0120.00.010.290.270.430.845.00.920.100.090.150.3015.00.320.010.200.290.1515.00.32 THYROID THYROID THYROID THYROIDTHYROID RESULTS BASED UPON:ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.797 of 187 Table 3.1-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASESPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 ADULT RECEPTOR 1ST TYPE QUARTER JAN-MAR GAMMA AIR9.66E-03 (MRAD)(WSW)BETA AIR4.23E-04 (MRAD)(ESE)TOT. BODY7.30E-03 (MREM)(WSW)SKIN7.74E-03 (MREM)(WSW)ORGAN1.02E-03 (MREM)(NNE)THYROID 2ND3RD4TH QUARTERQUARTERQUARTERANNUAL APR-JUNJUL-SEPOCT-DEC 8.88E-031.44E-022.77E-026.06E-02 (WSW)(WSW)(WSW)(WSW)2.43E-045.16E-041.07E-032.25E-03 (ESE)(ESE)(ESE)(ESE)6.71E-031.09E-022.10E-024.58E-02 (WSW)(WSW)(WSW)(WSW)7.03E-031.14E-022.21E-024.83E-02 (WSW)(WSW)(WSW)(WSW)1.51E-022.20E-021.12E-024.93E-02 (NNE)(NNE)(NNE)(NNE)THYROIDTHYROIDTHYROIDTHYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10CFR 50 APP.

ADULT RECEPTOR

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

QTRLY OBJ GAMMA AIR (MRAD)5.0 BETA AIR (MRAD)10.0 TOT. BODY (MREM)2.5 SKIN (MREM)7.5 ORGAN (MREM)7.5 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OF JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. I0.190.180.290.5510.00.610.000.000.010.0120.00.010.290.270.430.845.00.920.100.090.150.3015.00.320.010.200.290.1515.00.33 THYROID THYROID THYROID THYROIDTHYROID RESULTS BASED UPON:ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.898 of 187 Table 3.2-1 LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTSPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 INFANT RECEPTOR 1ST2ND3RD4TH QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC 0.00E+000.00E+000.00E+000.00E+000.00E+00 0.00E+000.00E+000.00E+000.00E+000.00E+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10 CFR 50 APP. I

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

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. ITOTAL BODY (MREM) 1.50.000.000.000.003.00.00CRIT. 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 DOSE TYPE TOTAL BODY INTERNAL ORGAN E-1.999 of 187 Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTSPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 CHILD RECEPTOR 1ST2ND3RD4TH QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC 0.00E+000.00E+000.00E+000.00E+000.00E+00 0.00E+000.00E+000.00E+000.00E+000.00E+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10 CFR 50 APP. I

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

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. ITOTAL BODY (MREM) 1.50.000.000.000.003.00.00CRIT. 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 DOSE TYPE TOTAL BODY INTERNAL ORGAN E-1.10100 of 187 Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTSPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 TEENAGER RECEPTOR 1ST2ND3RD4TH QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC 0.00E+000.00E+000.00E+000.00E+000.00E+00 0.00E+000.00E+000.00E+000.00E+000.00E+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10 CFR 50 APP. I

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

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY% OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. ITOTAL BODY (MREM) 1.50.000.000.000.003.00.00CRIT. 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 DOSE TYPE TOTAL BODY INTERNAL ORGAN E-1.11101 of 187 Table 3.2-1 (continued)

LASALLE STATION UNIT ONE ACTUAL 2009 MAXIMUM DOSES (MREM) RESULTING FROM AQUATIC EFFLUENTSPERIOD OF RELEASE - 01/01/09 TO 12/31/09 CALCULATED 04/01/10 ADULT RECEPTOR 1ST2ND3RD4TH QUARTERQUARTERQUARTERQUARTERANNUAL JAN-MARAPR-JUNJUL-SEPOCT-DEC 0.00E+000.00E+000.00E+000.00E+000.00E+00 0.00E+000.00E+000.00E+000.00E+000.00E+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2009 COMPLIANCE STATUS - 10 CFR 50 APP. I

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

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY%OFOBJJAN-MAR APR-JUN JUL-SEP OCT-DEC OBJAPP. ITOTAL BODY (MREM) 1.50.000.000.000.003.00.00CRIT. 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 DOSE TYPE TOTAL BODY INTERNAL ORGAN E-1.12102 of 187 Table 3.3-1 LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/09 TO 12/31/09 CALCULATED 04/06/10 1.10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr4.00E-01 10 CFR 20.1301 (a)(1) limitmrem/yr100.0% of limit0.40 Compliance Summary - 10CFR20 1st2nd3rd4th% of QtrQtrQtrQtrLimit TEDE9.59E-02 9.24E-02 9.77E-02 1.14E-010.40 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 187 Table 3.3-1 (continued)

LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/09 TO 12/31/09 CALCULATED 04/06/10 2.10 CFR 20.1301 (d)/40 CFR 190 Compliance DoseLimit%of (mrem)(mrem)Limit Whole BodyPlume4.58E-02 (DDE)Skyshine3.44E-01 Ground1.76E-03 Total 3.92E-0125.01.57 Organ DoseThyroid4.14E-0275.00.06 (CDE)Gonads7.25E-0325.00.03 Breast7.22E-0325.00.03 Lung7.22E-0325.00.03 Marrow7.29E-0325.00.03 Bone7.32E-0325.00.03 Remainder7.38E-0325.00.03 CEDE8.31E-03 TEDE4.00E-01100.00.40 RESULTS BASED UPON: ODCM ANNEX REVISION3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 E-1.14104 of 187 Table 3.3-1 (continued)

LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/09 TO 12/31/09 CALCULATED 04/01/10 1.10 CFR 20.1301 (a)(1) Compliance Total Effective Dose Eqivalent, mrem/yr3.23E-01 10 CFR 20.1301 (a)(1) limitmrem/yr100.0% of limit0.32 Compliance Summary - 10CFR20 1st2nd3rd4th% of QtrQtrQtrQtrLimit TEDE6.35E-02 8.83E-02 8.40E-02 8.69E-020.32 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 187 Table 3.3-1 (continued)

LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/09 TO 12/31/09 CALCULATED 04/01/10 2.10 CFR 20.1301 (d)/40 CFR 190 Compliance DoseLimit% of (mrem)(mrem)Limit Plume0.00E+00 Skyshine3.23E-01 Ground0.00E+00Total 3.23E-0125.01.29 Organ DoseThyroid0.00E+0075.00.00 (CDE)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 TEDE3.23E-01100.00.32 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)E-1.16106 of 187 Table 3.4-1 LaSalle Station - Unit 1 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2009 TYPE OF DOSE GAMMA AIR (mrad)

BETA AIR (mrad)

WHOLE BODY (mrem)

SKIN (mrem)

ORGAN (mrem)

CRITICAL PERSON CRITICAL ORGAN FIRST QUARTER 6.550E-03(SE) 1.160E-03(ESE) 2.505E-03(ESE) 3.680E-03(ESE) 2.815E-04(ESE)

Child Thyroid SECOND QUARTER 1.045E-02(SW) 8.200E-04(SW) 3.195E-03(SW) 4.030E-03(SW) 1.655E-04(SW)

Child Thyroid THIRD QUARTER 2.530E-02(WSW) 1.755E-03(WSW) 6.000E-03(SW) 7.500E-03(SW) 2.225E-04(WSW)

Child Thyroid FOURTH QUARTERANNUAL 1.875E-02(WSW)5.479E-02(WSW) 2.850E-03(E)4.671E-03(E) 4.775E-03(NE)1.314E-02( SW) 7.250E-03(NE)1.684E-02(SW) 2.290E-04(E)6.765E-04(ESE)

ChildChild ThyroidThyroid COMPLIANCE STATUS TYPE OF DOSE GAMMA AIR (mrad)

BETA AIR (mrad)

WHOLE BODY (mrem)

SKIN (mrem)

ORGAN (mrem)

CRITICAL PERSON CRITICAL ORGAN 10 CFR 50 APP. I QUARTERLY OBJECTIVE % OF APP. I0.51 0.03 0.240.10 0.00 Child Thyroid 10 CFR 50 APP.I YEARLY OBJECTIVE % OF APP. I10.00.5520.00.025.00.2615.00.1115.00.00 Child Thyroid5.0 10.0 2.5 7.5 7.5 Calculation used release data from the following:

Unit 0 - Chimney Date of calculation:4/13/2010 E-1.17 107 of 187 Table 3.4-1 (continued)

LaSalle Station - Unit 2 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES 2009 TYPE OF DOSEFIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTERANNUAL GAMMA AIR (mrad)6.550E-03(SE)1.045E-02(SW)2.530E-02(WSW) 1.875E-02(WSW) 5.479E-02(WSW)

BETA AIR (mrad)1.160E-03(ESE) 8.200E-04(SW)1.755E-03(WSW) 2.850E-03(E)4.671E-03(E)

WHOLE BODY (mrem) 2.505E-03(ESE) 3.195E-03(SW)6.000E-03(SW) 4.775E-03(NE)1.314E-02(SW)

SKIN (mrem)3.680E-03(ESE) 4.030E-03(SW)7.500E-03(SW)7.250E-03(NE)1.684E-02(SW)

ORGAN (mrem)2.815E-04(ESE) 1.655E-04(SW)2.225E-04(WSW) 2.290E-04(E)6.765E-04(ESE)

CRITICAL PERSONChildChildChildChildChild CRITICAL ORGANThyroidThyroidThyroidThyroidThyroid COMPLIANCE STATUS10 CFR 50 APP. I10 CFR 50 APP.I TYPE OF DOSE QUARTERLY OBJECTIVE % OF APP. IYEARLY OBJECTIVE % OF APP. I GAMMA AIR (mrad)5.00.5110.00.55 BETA AIR (mrad)10.00.0320.00.02 WHOLE BODY (mrem)2.50.245.00.26 SKIN (mrem)7.50.1015.00.11 ORGAN (mrem)7.50.0015.00.00 CRITICAL PERSONChild CRITICAL ORGANThyroid Child Thyroid Calculation used release data from the following:

Unit 0 - Chimney Date of calculation:4/13/2010 E-1.18108 of 187 APPENDIX F METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January - March 2009 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 N038150026NNE031440021NE02770016ENE00680 14 E00640010ESE10650012SE21480015SSE0311005 S00572014SSW0231006SW1021004WSW0001012 W0213107WNW024116124NW00327012NNW012133221 Variable0000000 Total4197291194209 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:9 F-1110 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 N0021003NNE0241007NE0124007ENE0011002 E0110002ESE03740014SE0141107SSE0040206 S01374116SSW0131308SW0010405WSW0011103 W0130329WNW00458017NW0011002NNW02362013 Variable0000000 Total0134433283121Hours of calmin this stabilityclass:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:9F-2111 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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------------------------------N0162009NNE01930013NE00783018ENE0007007 E0020103ESE07650018SE11260010SSE00271010 S0022105SSW0011507SW05713016WSW0302106 W1213119WNW0111119133NW013134021NNW001372022 Variable0000000 Total2227278312207 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:9 F-3112 of 187 LaSalle County Generating Station Period of Record: January - March 2009Stability Class - Neutral- 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction1-34-78-1213-1819-24> 24Total--------------------------------------------N0124650063NNE17360017NE1111213037ENE04960019 E041647031ESE07121313146SE04805017SSE0214103231 S0241411334SSW08598131SW1871212141WSW3145104036 W01216125651WNW184455206134NW0945313088NNW2154226270112 Variable0000000 Total911728723412120788 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:9 F-4113 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 N010200012 NNE010300013 NE1310005 ENE13620012 E071450026 ESE05667226 SE0111039235 SSE171352028 S2617106344 SSW0351812038 SW038229042 WSW139111025 W0717136548 WNW213272710685 NW3132850049 NNW0121250029 Variable0000000 Total111161781326218517 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:9 F-5114 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 N0200002NNE0100001NE0000000ENE0020002 E0150006ESE19400014SE19500015SSE091000019 S071030020SSW13810013SW12573018WSW041021017 W0620170043WNW161522026NW0120003NNW0100001 Variable0000000 Total561963260200 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:9 F-6115 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 E0210003ESE0600006SE113400018SSE09500014 S04700011SSW031810022SW0243009WSW01640011 W0330006WNW0220004NW0110002NNW0000000 Variable0000000 Total14651800106 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:9 F-7116 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 W0000000WNW0000011NW0000246NNW0000235 Variable0000000 Total00004812 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:9 F-8117 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 N00035210NNE0005207NE0003407ENE0000505 E0000000ESE0002002SE0000000SSE0000000 S0000000SSW0000000SW0000000WSW0000000 W0000000WNW0000055NW0000033NNW0000022 Variable0000000 Total00013161241 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:9 F-9118 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 N00273113NNE00380112NE0122207ENE0010102 E0003104ESE0035008SE1014006SSE2220006 S0113027SSW0104005SW0100001WSW0000000 W0001102WNW0004228NW0000112NNW0003429 Variable0000000 Total36154415992 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:9 F-10119 of 187 LaSalle County Generating Station Period of Record: January - March 2009Stability Class - Neutral- 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total--------------------------------------------N011253413083 NNE0391681248 NE0251826556 ENE036817034 E06857632 ESE081010152467 SE0111591137 SSE11720161055 S0279143567 SSW059192246 SW110157121964 WSW16102111242 W141910122672 WNW1525405252175 NW1526544535166 NNW01314401321101 Variable0000000 Total6852062792792901145 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:9 F-11120 of 187 LaSalle County Generating Station Period of Record: January - March 2009Stability 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 N00778325NNE12272014NE00751013ENE02542013 E03167421ESE034751635SE0346181748SSE0428151039 S0348142453SSW1244123659SW015692748WSW055951034 W03215232063WNW02224343294NW121312111049NNW1241391342 Variable0000000 Total43771141175222650 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:9 F-12121 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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 N0001001NNE0012003NE00000 0ENE0000000 E0000123ESE0102126SE10016210SSE00388726 S00262717SSW00252514SW001411521WSW0022149 W00382417WNW00276621NW0101204NNW0002103 Variable0000000 Total1216493354155 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:9 F-13122 of 187 LaSalle County Generating Station Period of Record: January - March 2009 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--------------------------------------------N0000000 NNE0000000 NE0000000 ENE0000000 E0000000 ESE0000000 SE0000112 SSE0124007 S0010034 SSW00255517 SW00550919 WSW0000000 w0011002 WNW0000000 NW0002204 NNW0000000 Variable0000000 Total01111781855 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:9 F-14123 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0006006SW0002002WSW0000404 W0000000WNW0010001NW0000000NNW0000000 Variable0000000 Total00184013 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-15124 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 N0000000NNE0010001NE0000000ENE0010001 E0000000ESE0000000SE0000000SSE0001001 S0014005SSW0004206SW0115018WSW0002507 W0013015WNW0051006NW0001304NNW0000000 Variable0000000 Total01102110244 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-16125 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 N0112004 NNE0041005 NE012393036 ENE0011103 E0061007 ESE0003003 SE0000202 SSE0002002 S0007007 SSW0032218 SW0015107 WSW0124108 W011381023 WNW00973019 NW01257015 NNW0314008 Variable0000000 Total086661211157 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-17126 of 187 LaSalle County Generating Station Period of Record: April - June 2009Stability Class - Neutral- 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction1-34-78-1213-1819-24> 24Total N2201892051NNE0332990071NE1196938100137ENE1162821333102 E21028207067ESE1812133037SE291158035SSE06562221 S11019152047SSW2101067035SW179134034WSW1151594145 W2826220159WNW0274634240131NW01228268175NNW11013425071 Variable0000000 Total1722036628811981018 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:5 Hours of missing stability measurements in all stability classes:1 F-18127 of 187 LaSalle County Generating Station Period of Record: April - June 2009Stability 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 N015700022 NNE1271200040 NE0132240039 ENE073391050 E1103164052 ESE05921017 SE17832021 SSE02371013 S231841028 SSW08131616053 SW371322027 WSW25872024 W1151833040 WNW31422912060 NW151520023 NNW051590029 Variable0000000 Total1514824783450538 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:1F-19128 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 N1600007NNE0400004NE0000000ENE0210003 E0102400034ESE18400013SE018410023SSE07400011 S15651018SSW041030017SW19810019WSW1101810030 W3131720035WNW112800021NW18100010NNW0340007 Variable0000000 Total101191091310252 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-20129 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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-----------------------------------N0100001NNE0000000NE0000000ENE0000000 E0220004ESE0810009SE112100014SSE012200014 S0131300026SSW041600020SW0421007WSW031800021 W0121200024WNW010100011NW0200002NNW0110002 Variable0000000 Total18469100155 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-21130 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 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: F-22131 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 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 F-23132 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 N0000000NNE0000000NE0001001ENE0000000 E0000000ESE0000000SE0000000SSE0000101 S0001203SSW0001809SW0001416WSW0001056 W0000101WNW0000000NW0000000NNW0000000 Variable0000000 Total000516627 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-24133 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 N11117124853NNE114262811989NE21634823719190ENE1138391240113 E04162513563ESE061199338SE1210511433SSE15564728 S271416101160SSW05107121650SW18121214956WSW19710101047 W06253117281WNW01121433033138NW1721412533128NNW13161024963 Variable0000000 Total131272533762332281230 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-25134 of 187 LaSalle County Generating Station Period of Record: April - June 2009Stability 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 N00742013NNE0310187038 NE037257042ENE007301038 E1042126254ESE13189426SE01447723SSE13345622 S0446121137SSW0158113055SW1251314641WSW01265418 W0291118545WNW271119171672NW0921912446NNW014128631 Variable0000000 Total64085208161101601 Hours of calm in this stability class:1 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-26135 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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---------------N040104119 NNE0000000 NE0220004 ENE1220005 E00276116 ESE01545318 SE020715226 SSE13275220 S013125627 SSW012382337 SW0003339 WSW01397020 W016107428 WNW0051711235 NW0232007 NNW02540011 Variable0000000 Total22240957647282 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-27136 of 187 LaSalle County Generating Station Period of Record: April - June 2009 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 E0000000ESE0010001SE0003115SSE0102025 S00185014SSW0034029SW0000011WSW0020002 W0010113WNW0000000NW0000000NNW0002002 Variable0000000 Total018197742 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-28137 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0000000SW0012003WSW0001001 W0030003WNW0000000NW0000000NNW0000000 Variable0000000 Total0043007 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-29138 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N0000000 NNE0000000 NE0011002 ENE0000000 E0000000 ESE0000000 SE0000000 SSE0000000 S0020002 SSW02710010 SW0053008 WSW0053008 W001040014 WNW00830011 NW0000000 NNW0000000 Variable0000000 Total0238150055 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-30139 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N0330006 NNE0000000 NE0030003 ENE0022004 E0010001 ESE0001001 SE0030003 SSE0200002 S0130004 SSW0522009 SW02950016 WSW00930012 W011510017 WNW001850023 NW021100013 NNW0034007 Variable0000000 Total016822300121 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-31140 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N1411700059NNE545310054NE04927120088ENE333552430118 E1443371086ESE1261750049SE5121830038SSE231410020 S08610015SSW361870034SW391690037WSW0231880049 W2211060039WNW21439121068NW1204170069NNW4145780083 Variable0000000 Total3336838911150906Hours 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-32141 of 187 LaSalle County Generating Station Period of Record: July - September 2009Stability 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 N438000042NNE341400048NE3171100031ENE0193210052 E2293100062ESE112600019SE1101400025SSE181020021 S111821023SSW392460042SW192230035WSW311610021 W3141117339WNW229718350NW412401021NNW518400027 Variable0000000 Total3728719417176558 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-33142 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N213000015NNE29000011NE2200004ENE19200012 E2481900069ESE416000020SE39400016SSE212200016 S211200015SSW1101000021SW015200017WSW118100020 W3151700035WNW529200036NW56100012NNW315000018 Variable0000000 Total3823762000337 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-34143 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N0300003NNE0000000NE0100001ENE0000000 E010100011ESE018000018SE318000021SSE122000023 S221000023SSW130700038SW016300019WSW119100021 W112000013WNW023000023NW1200003NNW0610007 Variable0000000 Total1020113000224 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-35144 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 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:0 F-36145 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 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:0 F-37146 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N0000000NNE0000000NE0001001ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0003104SW0010405WSW0012104 W0023005WNW0021003NW0000000NNW0000000 Variable0000000 Total006106022 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-38147 of 187 LaSalle County Generating Station Period of Record: July - September 2009Stability Class - Neutral- 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction1-34-78-1213-1819-24> 24Total--------------------------------------------N0212591056NNE1212601150NE430362590104ENE0244947154139 E22233148281ESE11312132041SE0510145034SSE149105029 S171151025SSW15111710347SW19172015365WSW010241910265 W2727127055WNW110303010182NW0105039115115NNW21036303081 Variable0000000 Total17208406304113211069 Hours of calm in this stability class:1 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:0 F-39148 of 187 LaSalle County Generating Station Period of Record: July - September 2009Stability 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 N24864024 NNE021865031 NE11321296070 ENE063758110112 E1725269068 ESE054128130 SE146414029 SSE11126516 S01497425 SSW32516121149 SW124922745 WSW14698028 W2315124541 WNW23622141764 NW2714236254 NNW071945035 Variable0000000 Total177119324714152721 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-40149 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N131180023 NNE0121004 NE24820016 ENE064101021 E02683120 ESE033712328 SE14764426 SSE01554116 S0191110637 SSW03963627 SW0210813437 WSW101061018 W011461123 WNW123116124 NW019103023 NNW0115108 Variable0000000 Total6351111106227351 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-41150 of 187 LaSalle County Generating Station Period of Record: July - September 2009 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 N0004004NNE0000000NE0010001ENE0000000 E0000000ESE0002046SE0011125SSE01316011 S0002237SSW0005005SW0001102WSW0001001 W0000000WNW0000000NW0010001NNW0010001 Variable0000000 Total0171710944 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 187 LaSalle County Generating Station Period of Record: October - December 2009 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 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 F-43152 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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 N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0001001SW0003003WSw0000000 w0000000WNW0200002NW0000000NNW0000000 Variable0000000 Total0204006 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-44153 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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 N0000000NNE0010001NE0010001ENE0000000 E0000000ESE0000000SE0010001SSE0020002 S0021306SSW0022004SW0001102WSW0003003 W0122106WNW0120003NW0010001NNW0000000 Variable0000000 Total021495030 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-45154 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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 N1212760055NNE083010039NE0813168045ENE08193927699 E1736433310130ESE3132180348SE31023103150SSE1112071040 S01023191053SSW41842184086SW420421911096WSW415484147119 W1195347175142WNW0125048110121NW0513180036NNW11146311090 Variable0000000 Total23196506371121321249 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-46155 of 187 LaSalle County Generating Station Period of Record: October - December 2009Stability 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 N0600006NNE081300021NE01630010ENE031450022 E0121410027ESE023940036SE2151421034SSE11922142058 S11319100043SSW01035160061SW2714170040WSW0923162050 W3714714651WNW114874135NW131000014NNW0260008 Variable0000000 Total11152221102237516 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-47156 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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 N0100001NNE0100001NE0200002ENE0010001 E010500015ESE016100017SE012600018SSE071000017 S05700012SSW01237120061SW131140019WSW191010021 W06400010WNW0211200033NW0320005NNW0120003 Variable0000000 Total21091081700236 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-48157 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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 N0000000NNE0000000NE1000001ENE0000000 E19600016ESE120600027SE026600032SSE0810009 S112300016SSW018910028SW112700020WSW0800008 W0800008WNW0500005NW0000000NNW0000000 Variable0000000 Total512638100170 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-49158 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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--------------------------------------------N0000000 NNE0000000 NE0000000 ENE0000000 E0000000 ESE0000000 SE0000000 SSE0000000 S0000000 SSW0000000 SW0000000 WSW0000000 W0000000 WNW0000000 NW0000000 NNW0000000 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 F-50159 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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--------------------------------------------N0000000 NNE0000000 NE0000000 ENE0000000 E0000000 ESE0000000 SE0000000 SSE0000000 S0000000 SSW0000000 SW0000000 WSW0000000 W0000000 WNW0000000 NW0000000 NNW0000000 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 F-51160 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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 N0000000NNE0000000NE0000000ENE0000000 E0000000ESE0000000SE0000000SSE0000000 S0000000SSW0000000SW0000101WSW0000000 W0001001WNW0000000NW0000000NNW0000000 Variable0000000 Total0001102 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-52161 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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 N0872714056NNE0127192049NE1571416548ENE0813292743120 E111321221270ESE03121310442SE121111111551SSE1421105142 S24211210756SSW010102712665SW1526381913102WSW0717392219104 W11224413629143WNW101646318102NW041528301087NNW0413318359 Variable0000000 Total9782414082851751196 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:130 Hours of missing stability measurements in all stability classes:1 F-53162 of 187 LaSalle County Generating Station Period of Record: October - December 2009Stability 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 N12161011NNE0010001NE00166417ENE00466218 E007111120ESE05384121SE1421210433SSE0311229853 S141116231772SSW011214282782SW12514352178WSW019681337 W14315191759WNW0021261131NW00996024NNW12514013 Variable0000000 Total62886158166126570 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:31 Hours of missing stability measurements in all stability classes:1 F-54163 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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--------------------------------------------N0031004 NNE0000000 NE0000000 ENE0000000 E0100113 ESE010291022 SE02693020 SSE01158520 S01266116 SSW019371232 SW03711141146 WSW0123017 W0510006 WNW05260013 NW01247115 NNW00290011 Variable0000000 Total02237595542215 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:5 Hours of missing stability measurements in all stability classes:1 F-55164 of 187 LaSalle County Generating Station Period of Record: October - December 2009 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--------------------------------------------N0000000 NNE1000001 NE0000000 ENE0000000 E0000000 ESE0000101 SE0000202 SSE01165013 S10187623 SSW0210205 SW0310318 WSW0001102 W0100001 WNW0000000 NW0000000 NNW2000002 Variable0000000 Total4741521758 Hours of calm in this stability class:0 Hours of missing wind measurements in this stability class:0 Hours of missing stability measurements in all stability classes:1 F-56165 of 187 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 2009 Prepared By Teledyne Brown Engineering Environmental Services LaSalle County Station Marseilles, IL 61341 May 2010 167 of 187 Table Of Contents 1.Summary and Conclusions ..............................................................................................1 I I .Introduction

..................................................................................................................... 2 A.Objectives of the RGPP ...................................................................................... 2 B.Implementation of the Objectives

........................................................................ 2 C.Program Description

........................................................................................... 3 D.Characteristics of Tritium (H-3) ........................................................................... 3 III.Program Description

...................................................................................................... 4 A.Sample Analysis

.................................................................................................. 4 B.Data Interpretation

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

5 C.Background Analysis

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

5 1.Background Concentrations of Tritium

..................................................... 6 IV.Results and Discussion ................................................................................................. 8 A.Groundwater Results ........................................................................................... 8 B.Surface Water Results ........................................................................................ 8 C.Drinking Water Well Survey ................................................................................ 9 D.Summary of Results - Inter-laboratory Comparison Program ............................ 9 E.Leaks, Spills, and Releases ................................................................................ 9 F.Trends .................................................................................................................. 9 G.Investigations ...................................................................................................... 9 H.Actions Taken ..................................................................................................... 9 168 of 187 Appendices Appendix ALocation Designation & Distance Tables Table A-1LaSalle County Station Groundwater Monitoring Sample Point List Figures Figure A-1LaSalle County Station Map of Groundwater Monitoring Sample Locations.

Appendix BData Tables Tables Table B-1.1Concentrations of Tritium in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2009.

Table B-11.1Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2009.

It 169 of 187 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 2009 are included in this report.

This is the fourth 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 2009. During that time period, 30 analyses were performed on 30 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.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 <LLD to 510 +/- 117 pCi/L.No tritium was detected in the six surface water samples above the specified LLD. Elevated tritium levels (> 200 pCi/L) observed in the single well location are believed to be associated with the 2001 CY tank rupture as documented in the stations 10CFR50.75(g) report.

170 of 187 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) on samples collected in 2009.

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

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

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

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

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

5.Regularly assess analytical results to identify adverse trends.

6.Take necessary corrective actions to protect groundwater resources.

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

Exelon and its consultant identified locations as described in the 2006 Phase 1 study. Phase 1 studies were conducted by Conestoga Rovers and Associates (CRA) and the results and conclusions were made available to state and federal regulators.

1.The LaSalle County Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the 2 171 of 187 surface and shallow subsurface are updated based on ongoing measurements.

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

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

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

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

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

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

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

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

D.Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking 172 of 187 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 2009.

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

1.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)-4 173 of 187 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.

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 174 of 187 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 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. 175 of 187 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 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.

7 176 of 187 IV.Results and Discussion A.Groundwater Results Groundwater Samples were collected from on -site wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from nine locations were analyzed for tritium activity (Table B-1.1, Appendix B). Tritium values ranged from <LLD to 510 pCi/L at well MW-LS-105s. 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 analyses were performed in 2009.

Gamma Emitters No gamma analyses were performed in 2009.

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

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

8 177 of 187 Strontium No Sr-90 analyses were performed in 2009.

Gamma Emitters No Gamma analyses were performed in 2009.

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

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

E.Leaks, Spills, and Releases 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 2009 H.Actions Taken 1.Compensatory Actions There were no required compensatory actions as a result of RGPP monitoring at LaSalle in 2009. 178 of 187 2.Installation of Monitoring Wells No new monitoring wells were added beyond the initial phase for LaSalle in 2009.

3.Actions to Recover/Reverse Plumes 2009 LaSalle RGPP efforts resulted in no required actions. 179 of 187 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 Active Illinois River Downstream at Marseilles (Illini State Park Boat Ramp)

SW-LS-106 Active Circ Water Intake Bay MW-LS-101S Inactive 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 Wells with an `active' status are sampled and analyzed for radionuclide activity, wells with an

`inactive' status are not. This is based on the original baseline study as well risk associated with well location. Should radionuclide activity be detected in sampled wells, all well statuses would be reassessed.

A-1181 of 187 Sample No.

Location Current Well Status MW-LS-108S Inactive Near 12 KV Swithchyard MW-LS-109S Inactive Near BDG 33 MW-LS-110S Active RSH Area by Valve Pit 16B MW-LS-111 S West Perimeter Road before pad mounted transformer (right hand side)

Active MW-LS-1125 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 Wells with an 'active' status are sampled and analyzed for radionuclide activity, wells with an

'inactive' status are not. This is based on the original baseline study as well risk associated with well location. Should radionuclide activity be detected in sampled wells, all well statuses would be reassessed.

A-2182 of 187 APPENDIX A-1 LASALLE COUNTY STATION MAP OF GROUNDWATER MONITORING SAMPLE LOCATIONS ADDITIONAL MONITORING WELL LOCATION KEY PLAN CONTINU US TO BLONEONN LINE I T1 KEY PLANH 101 FiNA.. DRAFT PRIVILEGED AND CONFIDENTIAL ATTORNEY-CLIENT COMMUNICATION ATTORNEY WORK PRODUCT acnevwrrwnav EXELON GENERATION COMPANY, LLC FLEETWIDE TRITIUM ASSESSMENTMONITORING WELL AND SAMPLING LOCATIONS LASALLE GENERATING STATION MARSEILLES, ILLINOIS Exekon.Hd O F: 0 01 B 4513624 016 Eg m4.1 APPENDIX B DATA TABLES 185 of 187 TABLE B-1.1CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITEDATE H-3 HP-1004/13/09< 156 HP-1009/29/09< 168 HP-204/13/09< 156 HP-209/30/09< 163 HP-504/14/09< 157 HP-509/30/09< 166 HP-704/14/09< 158 HP-709/29/09< 164 MW-LS-104S04/17/09< 155 MW-LS-104S10/13/09< 177 MW-LS-105S04/14/09510 +/- 117 MW-LS-105S10/02/09199 +/- 118 MW-LS-106S04/16/09< 157 MW-LS-106S10/01/09< 176 MW-LS-107S04/14/09< 182 MW-LS-1 07S09/30/09< 160 MW-LS-11OS10/26/09< 166 MW-LS-111 S04/16/09< 157 MW-LS-111S10/06/09< 170 TABLE B-11.1CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2009 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITEDATE H-3 SW-LS-10104/16/09< 155 SW-LS-10110/01/09< 170 SW-LS-10204/16/09< 156 SW-LS-10210/01/09< 172 SW-LS-10304/16/09< 155 SW-LS-10310/01/09< 177 SW-LS-10404/16/09< 159 SW-LS-10410/01/09< 174 SW-LS-10504/15/09< 160 SW-LS-10510/01/09< 168 SW-LS-10604/14/09< 159 SW-LS-10610/02/09< 173

RA10-021, 2009 Annual Radiological Environmental Operating Report

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