Text

Annual Radiological Environmental Operating Report
	ML22133A020
Person / Time
Site:	LaSalle
Issue date:	05/13/2022
From:	Hansett P; Constellation Energy Company
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
	RA22-020
	Download: ML22133A020 (175)
	v • d • e

Constellation&

LaSalle County Station 2601 North 21 " Road Marseilles, IL 61341 815-415-2000 Telephone RA22-020 May 13, 2022 10 CFR 50 Appendix I U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001

Subject:

LaSalle County Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-11 and NPF-18 NRC Docket Nos. 50-373, 50-374, and 72-70 2021 Annual Radiological Environmental Operating Report Enclosed is the Constellation Energy Generation, LLC, 2021 Annual Radiological Environmental Operating Report for LaSalle County Station, submitted in accordance with Technical Specification 5.6.2, "Annual Radiological Environmental Operating Report." The enclosed report contains the results of groundwater monitoring conducted in accordance with Constellation'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.

There are no regulatory commitments contained within this letter. Should you have any questions concerning this letter, please contact Mr. Daniel Mearhoff, Regulatory Assurance Manager, at (815) 415-2800.

Respectfully, U/~

Phil W. Hansett Site Vice President LaSalle County Station

Enclosures:

LaS.alle County Station Units 1 and 2 Annual Radiological Environmental Operating Report 1 January through 31 December 2021 cc:

Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station

Docket No:

50-373 50-374 LASALLE COUNTY STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January through 31 December 2021 Prepared By Teledyne Brown Engineering Environmental Services

/.--

Exelon Generation LaSalle County Station Marseilles, IL 61341 May 2022

Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction...................................................................................................................... 2 A. Objectives of the REMP....................................................................................... 2 B. Implementation of the Objectives........................................................................ 2 Ill. Program Description....................................................................................................... 3 A. Sample Collection................................................................................................ 3 B. Sample Analysis.................................................................................................. 5 C. Data Interpretation............................................................................................... 5 D. Program Exceptions............................................................................................ 6 E. Program Changes............................................................................................... 8 IV. Results and Discussion................................................................................................. 9 A. Aquatic Environment........................................................................................... 9

1. Surface Water........................................................................................... 9

2. Ground/Well Water................................................................................. 1 O

3. Fish......................................................................................................... 10

4. Sediment................................................................................................. 1 O B. Atmospheric Environment................................................................................. 11 1. Airborne.................................................................................................. 11

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

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

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

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

b. Food Products.............................................................................. 12

c. Vegetation.................................................................................... 12 C. Ambient Gamma Radiation............................................................................... 13 D. Land Use Census.............................................................................................. 13 E. Errata Data........................................................................................................ 14 F. Summary of Results-Inter-laboratory Comparison Program........................... 14

Appendix A Tables Table A-1 Appendix B Tables Table B-1 Table B-2 Figures Figure B-1 Figure B-2 Figure B-3 Appendix C Tables Table C-1.1 Table C-1.2 Table C-1.3 Table C-I1.1 Table C-11.2 Appendices Radiological Environmental Monitoring Report Annual Summary Radiological Environmental Monitoring Program Annual Summary for the LaSalle County Station, 2021 Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2021 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2021 Inner Ring OSLO Locations of the LaSalle County Station, 2021 Outer Ring OSLO Locations and Fixed Air Sampling Locations of the LaSalle County Station, 2021 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2021 Data Tables and Figures - Primary Laboratory Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2021 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2021 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2021 Concentrations of Tritium in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2021 Concentrations of Gamma Emitters in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2021 ii

Table C-II1.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-V.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-Vl.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-Vll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-Vll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-Vlll.1 Concentrations of Gamma Emitters in Food Product Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-Vlll.2 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of LaSalle County Station, 2021 Table C-IX.1 Quarterly DLR Results for LaSalle County Station, 2021 Figures Figure C-1 Figure C-2 Figure C-3 Figure C-4 Figure C-5 Figure C-6 Figure C-7 Figure C-8 Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2021 Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2021 Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2005 - 2021 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2005 - 2021 Air Particulate - Gross Beta - Station L-10 (C) Collected in the Vicinity of LSCS, 2005 - 2021 Air Particulate - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LSCS, 2005 - 2021 Air Particulate - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LSCS, 2005 - 2021 Air Particulate - Gross Beta - Station L-11A Collected in the Vicinity of LSCS, 2016 - 2021 iii

Appendix D Tables Table D-1 Table D-2 Table D-3 Appendix E Appendix F Appendix G Appendix H Inter-Laboratory Comparison Program Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2021 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services, 2021 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2021 Effluent Data Meteorological Data Errata Data Annual Radiological Groundwater Protection Program Report (ARGPPR) iv

I.

Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the LaSalle County Station (LSCS) by Exelon covers the period 1 January 2021 through 31 December 2021. During that time period, 1,303 analyses were performed on 1,218 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of LSCS had no adverse radiological impact on the environment.

Surface water samples were analyzed for concentrations of gross beta, tritium and gamma-emitting nuclides. Ground/well water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. No fission or activation products were detected. Gross beta and tritium activities detected were consistent with those detected in previous years except for the control location November monthly sample (51.6 pCi/L). Several recounts and reanalyses confirmed this value. However, samples from the individual weekly grab samples stored at the sample collector vendor offices showed normal gross beta activity consistent with that detected in previous years.

Commercially and recreationally important fish species were sampled and analyzed for concentrations of gamma-emitting nuclides. No fission or activation products were detected in fish.

Sediment samples were analyzed for concentrations of gamma-emitting nuclides.

No fission or activation products were detected.

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

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

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

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

All nuclides were below the minimum detectable activity.

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

Vegetation samples were analyzed for concentrations of gamma-emitting nuclides.

No fission or activation products were detected.

Environmental gamma radiation measurements were performed quarterly using Optically Stimulated Luminescence Dosimeters (OSLO) for the Radiological Environmental Monitoring Program (REMP). The results from the environmental gamma radiation monitoring program were consistent with those detected in previous years.

II.

Introduction The LaSalle County Station (LSCS), consists of two boiling water reactors, each rated for 3,546 MWt. Both units are owned and operated by Exelon Corporation and are located in LaSalle County, Illinois. Unit 1 went critical on 16 March 1982.

Unit 2 went critical on 02 December 1983. The site is located in northern Illinois, approximately 75 miles southwest of Chicago, Illinois.

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

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Landauer on samples collected during the period 1 January 2021 through 31 December 2021.

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.

Ill.

Program Description A.

Sample Collection Samples for the LSCS REMP were collected for Exelon Nuclear by Environmental Inc. (Midwest Labs). This section describes the general collection methods used by Environmental Inc. (Midwest Labs) to obtain environmental samples for the LSCS REMP in 2021. Sample locations and descriptions can be found in Tables B-1 and B-2, and Figures B-1 through B-3, 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. Wells 4, 5 and 6 are associated with L-28. L-27 and L-28 Well 6 could be affected by LaSalle's effluent releases. All samples were collected via grab sample.

The samples were then transferred to new unused plastic containers. Both the grab container and the sample containers were rinsed with source water prior to actual sample collection. Fish samples were collected semiannually at three locations, L-34, L-35 and L-36 (Control). Sediment samples composed of recently deposited substrate were collected at three locations semiannually, L-21 (Control), L-40 and L-41.

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

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on samples of milk and food product. Samples are typically collected biweekly at one milk location (L-42) from May through September, and monthly from December through April. The control location was L-42.

All samples, when available, 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 during the growing season at five locations (L-42, L-Quad 1, L-Quad 2, L-Quad 3 and L-Quad 4 ). The control location was L-42. Various types of samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Vegetation samples were collected monthly during the growing season from May through October at three locations (L-Veg C, L-ESE1, and L-ESE2).

The control location was L-Veg C and was located in the lowest deposition sector (ENE sector) surrounding LaSalle. Various vegetation samples were also collected in the highest deposition sector (ESE sector) surrounding LaSalle. The samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Ambient Gamma Radiation Beginning in the first quarter of 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP).

Optically Stimulated Luminescent Dosimetry (OSLO) were deployed and Thermo-luminescent Dosimetry (TLD) were discontinued. This change may cause step changes in readings, up or down, depending on site characteristics. However, the relative comparison to control locations remains valid. OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

Each location consisted of 2 OSLO sets. The OSLDs were exchanged quarterly and sent to Landauer for analysis. The OSLO locations were placed on and around the LSCS site as follows:

An inner ring consisting of 16 locations (L-101, L-102, L-103, L-104, L-105, L-106, L-107, L-108, L-109, L-110, L-1118, L-112, L-113A, L-114, L-115 and L-116) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses from LSCS releases).

An outer ring consisting of 17 locations (L-201, L-202, L-203, L-204, L-205A, L-2058, 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 nearby population.

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

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

The specific OSLO locations were determined by the following criteria:

1.

The presence of relatively dense population;

2.

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

3.

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

4.

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

(Two OSLDs were placed at each location approximately six feet above ground level.)

B.

Sample Analysis This section describes the general analytical methodologies used by Environmental Inc. (Midwest Labs) and TBE to collect and analyze, respectively, the environmental samples for radioactivity for the LSCS REMP in 2021. The analytical procedures used by the laboratory are listed in Table B-2.

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

1.

Concentrations of beta emitters in surface water and air particulates

2.

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

3.

Concentrations of tritium in ground/well and surface water

4.

Concentrations of 1-131 in air and milk

5.

Ambient gamma radiation levels at various site environs C.

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

1.

Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5%

probability of falsely concluding that a blank observation represents a "real" signal. The LLD is intended as a before the fact (a priori) estimate of a system (including instrumentation, procedure and sample type) and not as an after the fact (a posteriori) criteria for the presence of activity. All analyses were designed to achieve the required LSCS detection capabilities for environmental sample analysis.

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

2.

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

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

For surface water, food products, and vegetation: 12 nuclides including 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 including 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 Sample Type Ml AP/Al AP/Al AP/Al For 2021, the LSCS REMP had a sample recovery rate of >99%. Sample anomalies and missed samples are listed in the following tables:

Table D-1 LISTING OF SAMPLE ANOMALIES Location Collection Reason Code Date(s) 01/07/21 L-42 02/03/21 Farmer stopped milking cows before calving season.

03/03/21 Low reading of 41.2 hrs., caused by a recent power restoration.

L-01 01/07/21 Restoration date and time estimated based on the timer reading.

Note: during the collection on 1/13/21 timer indicated 145.3 hrs. which is the expected value for the 6 days collection period.

Timer indicates approximately 5 hrs. less than expected due to a L-11A 01/20/21 power outage. Note: during the 1/27/21 collection the timer indicated 193.0 hrs.; expected value for the 8 days collection period.

L-06 01/27/21 Timer indicates approximately 9.3 hrs. less than expected due to a possible power outage.

Table D-1 LISTING OF SAMPLE ANOMALIES (cont'd)

Sample Location Collection Reason Type Code Date AP/Al L-03 02/11/21 Pump Vmax lower than usual, possibly caused by low temperatures.

Pump exchanged.

SW L-21 02/11/21 River Frozen 02/18/21 AP/Al L-06 02/18/21 Timer indicates lower value of 128.8 hrs during the 7 days collection period, possibly caused by a power outage.

OSLO L-03 02/18/21 Unable to check OSLDs. Access road blocked by unplowed snow.

SW L-40 02/11/21 River Frozen 02/18/21 AP/Al L-03 02/25/21 Sample collected after a two-week run, after clearing of the access road of snow.

The pump found not running with the timer indicating 126.7 hrs. No AP/Al L-01 04/26/21 electricity at the station due to a broken power wire. Chemistry informed. Pump exchanged as a precaution.

AP/Al L-01 05/13/21 Pump started on 5/7/21 @ 14:30 after power restoration. Total collection time was 138.2 hrs.

AP/Al L-05 07/14/21 Timer displayed 4.4 hrs. less than expected. Timer replaced. Time shortage due to combination of faulty timer and power outage.

Ml L-42 06/02/21 No sample due to very limited milk production.

06/17/21 AP/Al L-05 07/22/21 Timer displayed 8.2 hrs. less than expected. Timer replaced. Time shortage due to combination of faulty timer and power outage.

AP/Al L-05 07/29/21 Timer displayed 8.4 hrs. less than expected. Timer replaced. Time shortage due to combination of faulty timer and power outage.

AP/Al L-03 08/19/21 Timer indicated a low value of 82 hrs. due to a power outage. During the week of 8/26/21 collection time indicated the expected 168.3 hrs.

Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date(s)

AP/Al L-03 02/18/21 Unable to reach the station due to unplowed access road OSLO L-212 03/31/21 OSLO missing, possibly dislodged by strong winds or snow removal activities. Premises searched unsuccessfully.

OSLD L-209 06/30/21 OSLD missing, possibly dislodged by strong winds. Premises searched unsuccessfully.

OSLO L-102 09/29/21 OSLD missing, possibly dislodged by strong winds. Premises searched unsuccessfullv.

BS L-41 1st half, Unable to collect sample due to location inaccessibility. Future 2021 samples will be collected by fish collectors by boat at the shoreline.

Each program exception has been 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 2021.

IV.

Results and Discussion A.

Aquatic Environment

1.

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

Gross Beta Samples from all locations were analyzed for concentrations of gross beta (Table C-1.1, Appendix C). Gross beta was detected in 23 out of 24 samples with a range of 3.2 to 51.6 pCi/L. The gross beta results for control location L-21 collect during the month of November 2021 showed elevated results greater than Chemistry's administrative investigation level of 15 pCi/L 1. The initial analysis reported a value of 51.6 pCi/L. An immediate recount confirmed the original results (count 1 = 50.1 pCi/L). The gamma analysis showed no gamma producing radionuclides. After discussions with the laboratory another aliquot was obtained and analyzed. That reanalysis also, confirmed both earlier results (analysis 2 = 52.3 pCi/L). At this point approximately 30 days since the end of the November sample collection had passed.

Review of the sample container and the sample planchet mount wait indicated a significant amount of material was in the sample. Another gross beta analysis was requested. This analysis split the aliquot into two matrices suspended and dissolved portions. The results of that analysis, although higher than the investigation level did not confirm the original results (analysis 3 suspended = < 3.8 pCi/L and dissolved =

17.1 pCi/L).

The sample collector vendor was contacted to send an aliquot from each of the four weekly grab samples used to make the original monthly composite. Each of the four aliquot samples showed gross beta activity of less than 10 pCi/L. The average of these four results (6.5 pCi/L) was consistent with those detected in previous years (Figure C-1, Appendix C). The required LLD was met for all samples.

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium was detected in 5 of 8 samples with a range of 245 - 676 pCi/L. Concentrations detected were consistent with those detected in previous years.

(Figure C-2, Appendix C).

1 CY-AA-170-1000, Radiological Environmental Monitoring Program and Meteorological Program Implementation, Attachment 1, Analytical Results Investigation Levels Gamma Spectrometry Samples from both locations were analyzed for gamma-emitting nuclides (Table C-1.3, Appendix C). No nuclides were detected, and all required LLDs were met.

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

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

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides (Table C-I1.2, Appendix C). No nuclides were detected, and all required LLDs were met.

3.

Fish Fish samples were collected at three locations (L-34, L-35 and L-36) semiannually. Locations L-34 and L-:35 could be affected by LaSalle's effluent releases. The following analysis was performed:

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma-emitting nuclides (Table C-I11.1, Appendix C). Naturally occurring K-40 was found at all stations and ranged from 2,600 to 3,792 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. Location L-21 is located upstream and is not affected by LaSalle's liquid effluent releases. 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 the three locations were analyzed for gamma-emitting nuclides {Table C-IV.1, Appendix C). Naturally occurring K-40 was found at all stations and ranged from 10.010 to 17,510 pCi/kg dry.

No fission or activation products were found.

B.

Atmospheric Environment

1.

Airborne

a.

Air Particulates Continuous air particulate samples were collected from nine locations on a weekly basis. The nine locations were separated into four groups: Group I (onsite) represents locations within the LSCS site boundary (L-03 and L-05), Group II (near-site) represents the locations near the LSCS site (L-01 and L-06),

Group Ill (far-field) represents the locations at an intermediate distance from LSCS (L-04, L-07, L-08, and L-11A) and Group IV (control) represents the control location at a remote distance (L-10). The following analyses were performed:.

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-V.1 and C-V.2, Appendix C). Detectable gross beta activity was observed at all locations. Comparison of results among the four groups aid in determining the effects, if any, resulting from the operation of LSCS. The results from the onsite locations (Group I) ranged from 7 to 39E-3 pCi/m3 with a mean of 19E-3 pCi/m3. The results from the near-site location (Group II) ranged from 6 to 38E-3 pCi/m3 with a mean of 20E-3 pCi/m3.

The results from the far-field locations (Group Ill) ranged from 5 to 37E-3 pCi/m3 with a mean of 19E-3 pCi/m3. The results from the control location (Group IV) ranged from 8 to 39E-3 pCi/m3 with a mean of 20E-3 pCi/m3. Comparison of the 2021 air particulate data with previous year's data indicate no effects from the operation of LSCS (Figures C-3 through C-8, Appendix C). In addition, comparisons of the weekly mean values for 2021 indicate no notable differences among the four groups.

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma-emitting nuclides (Table C-V.3, Appendix C). Naturally occurring Be-7, due to cosmic ray activity, was detected in 36 of 36 samples. These values ranged from 82 to 183 E-3 pCi/m3. All other nuclides were less than the MDC.

b.

Airborne Iodine Continuous air samples were collected from ten locations (L-01, L-03, L-04, L-05, L-06, L-07, L-08, L-10, and L-11A) and analyzed weekly for 1-131 (Table C-Vl.1, Appendix C). No 1-131 was detected.

2.

Terrestrial

a.

Milk Samples were collected from one location (L-42) five times during 2021. The following analyses were performed:

lodine-131 Milk samples from the location were analyzed for concentrations of 1-131 (Table C-Vll.1, Appendix C). 1-131 was not detected, and the required LLDs were met.

Gamma Spectrometry Milk samples were analyzed for concentrations of gamma-emitting nuclides (Table C-Vll.2, Appendix C). Naturally occurring K-40 activity was found in all milk samples and ranged from 643 to 1,272 pCi/1. No other nuclides were detected, and all required LLDs were met.

b.

Food Products Food product samples were collected at five locations (L42, L-Quad 1, L-Quad 2, L-Quad 3 and L-Quad 4) when available. All locations could be affected by LaSalle's effluent releases. The following analysis was performed:

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

c.

Vegetation Vegetation samples were collected monthly during the growing season from May through October at three locations (L-Veg C, L-ESE-1, and L-ESE-2). The control location was L-Veg C and was located in the lowest deposition sector (ENE sector) surrounding LaSalle. Various vegetation samples were also collected in the highest deposition sector (ESE sector) surrounding LaSalle. The following analyses were performed:

Gamma Spectrometry Samples from all available locations were analyzed for gamma-emitting nuclides (Table C-Vlll.2, Appendix C). No nuclides were detected, and all required LLDs were met.

C.

Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Optically Stimulated Luminescence Dosimeters (OSLO). Forty-two OSLO locations were established around the site. Results of OSLO measurements are listed in Tables C-IX.1, Appendix C.

All OSLO measurements were at or below 22 mrem/std. quarter, with a range of 13.5 to 21.8 mrem/quarter. A comparison of the Normalized Annual Dose to the Baseline Background and Minimum Differential Dose indicates that there is no evidence of dose which could be attributed to facility-related direct radiation.

D.

Land Use Census A Land Use Census conducted August 17, 2021, around the LaSalle County Station (LSCS) was performed by Environmental Inc. (Midwest Labs) for Exelon Nuclear to comply with Radiological Effluent Control 12.5.2 of the LaSalle's Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident and milk producing animal in each of the sixteen 22 1/2 degree sectors around the site within 10 km (6.2 miles). The distance and direction of all locations from the LSCS reactor buildings were positioned using Global Positioning System (GPS) technology. Since there were no milk animals within 10 km of LSCS, beef cows were identified. There were no changes required to the LSCS REMP as a result of this survey. The results of this survey are summarized below:

A B

C D

E F

G H

J K

L M

N p

Q R

Distance in Miles from the LSCS Reactor Buildings Sector Residence Livestock Milk Farm N

NNE NE ENE E

ESE SE SSE s

SSW SW WSW w

WNW NW NNW Miles Miles Miles 3.9 4.0 1.6 1.7 2.1 3.5 3.3 4.6 3.2 1.4 1.7 1.8 1.5 0.7 1.0 1.5 1.7 0.9 1.7 1.7 5.1 4.7 1.5 5.8 3.0 3.0 3.3 4.5 14.2

E.

Errata Data There is no errata data for 2021.

F.

Summary of Results - Inter-Laboratory Comparison Program The TBE Laboratory analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation, and water matrices for various analytes. The PE samples supplied by Analytics Inc., Environmental Resource Associates (ERA) and Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

1.

Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of TBE's result and Analytics' known value. Since flag values are not assigned by Analytics, TBE evaluates the reported ratios based on internal QC requirements 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, National Environmental Laboratory Accreditation Conference (NELAC), state-specific Performance Testing (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. MAPEP defines three levels of performance:

Acceptable (flag = "A") - result within +/- 20% of the reference value Acceptable with Warning (flag = "W") - result falls in the +/- 20% to

+/- 30% of the reference value Not Acceptable (flag = "N") - bias is greater than 30% of the reference value Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

For the TBE laboratory, 146 out of 154 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria and were addressed through the TSE Corrective Action Program. NOTE: One analysis (soil for Tc-99) that did not meet acceptance criteria was performed for TBE information and is not on the list of required ICP analyses. A summary is found below:

1.

The ERA MRAD March 2021 Water Fe-55 result was evaluated as Not Acceptable. The reported value for Fe-55 was 579 pCi/L and the known result was 275 pCi/L (acceptance range 162 - 400). When reviewing the original sample data, it was found that the carrier yield was 52.6% (lower than typical water samples). Looking at the etched plate that was counted, it appeared that some loss of sample could have occurred. The sample was logged for reanalysis and used as the workgroup duplicate. The results were acceptable at 197 and 221 respectively. Yields were 97.4%

and 105. 7% and the plated samples were centered with no apparent loss of sample. The loss of sample during plating resulted in a low yield which produced an artificially high sample result. (NCR 21-01)

2.

The MAPEP February 2021 AP Gross Alpha result was evaluated as Not Acceptable. The reported value was 0.371 Sq/sample and the known result was 1.77 Sq/sample (acceptance range 0.53 - 3.01 ). A similar failure had occurred several years prior due to the filter being placed with the wrong side up on the detector. At that time, a small dot was placed on the top of the filter prior to removal from the package to indicate the correct side for counting. The current sample was still in the detector when the result was received (dot side facing the detector). The sample was recounted with a similar result and was flipped and recounted. The flipped result was 0.661 Sq/sample, within the acceptable range. Because TBE cannot rely on receiving correct packaging from the provider, MAPEP AP cross-checks will be counted on both sides going forward. NOTE: The August sample had the same packaging issue (upside down). (NCR 21-02)

3.

The MAPEP February 2021 soil Ni-63 was evaluated as Not Acceptable.

The reported value was 310 Bq/kg and the known result was 689 (acceptance range 482 - 896). All workgroup QC was reviewed with no anomalies. The analytical procedure had been revised prior to this analysis to eliminate added interferences. The sample yield was >100%,

indicative of incomplete separation from interferences, leading to a lower result. The procedure was again revised after acceptable results were obtained. (NCR 21-03)

4.

The ERA October 2021 water Gross Beta result was evaluated as Not Acceptable. The reported value was 63.0 pCi/L and the known was 55.7 (acceptance range 38.1 - 62.6) or 113% of the known. The 2-sigma error was 6.8, placing the reported result well within the acceptable range. All QA was reviewed with no anomalies. A follow-up Quick Response cross-check was analyzed with a 120% ratio (see item 7). (NCR 21-10)

5.

The ERA October 2021 water Tritium result was evaluated as Not Acceptable. The reported value was 13,800 pCi/L and the known was 17,200 (acceptance range 15,000 - 18,900). The 2-sigma error was 1,430, placing the result within the acceptable range. TBE's internal QC acceptance is 70% - 130%, while ERA's for this sample was 87% - 110%.

All QA was reviewed with no anomalies. A Quick Response follow-up cross-check was analyzed with a result of 17,500 pCi/L (known 17,800 pCi/L). (NCR 21-11)

6.

The MAPEP August 2021 soil Ni-63 result was evaluated as Not Acceptable. The reported value was 546 Bq/kg and the known result was 1,280 Bq/kg (acceptance range 896 - 1,664). All QC was reviewed and no anomalies found. The procedure revision to remove added MAPAP interferences was ineffective for this sample. No client soil matrix samples were analyzed for Ni-63 in 2020 or 2021. The root cause investigation is still ongoing at this time. (NCR 21-13)

7.

The ERA December 2021 Quick Response water Gross Beta result was evaluated as Not Acceptable. The reported value was 47.6 pCi/L and the known was 39.8 pCi/L or 120% of the known (acceptance range of 26.4 -

47.3). The 2-sigma error was 6.1, placing the reported result well within the acceptable range. All QA was reviewed with no anomalies. The original sample was recounted on a different detector with a result of 40.3 +/- 6.27 pCi/L. The "failure" of this sample and the RAD-127 was due to the narrow upper acceptance ranges assigned (119% and 112%) (NCR 21-14)

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

Intentionally left blank

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT ANNUAL

SUMMARY

Intentionally left blank

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2021 NAME OF FACILITY:

LASALLE COUNTY STATION DOCKET NUMBER:

50-373 & 50-37 4 LOCATION OF FACILITY:

MARSEILLES, IL REPORTING PERIOD:

2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN(M)

STATION#

NON ROUTINE (UNITOF ANALYSES ANALYSES OF DETECTION (F)

(F)

NAME REPORTED MEASUREMEN"!J.

PERFORMED PERFORMED

!LLDl RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 24 4

6.3 6.2 6.3 L-40 INDICATOR 0

(PCI/LITER)

(11/12)

(12/12)

(11/12)

ILLINOIS RIVER - DOWNSTREAM 3.2-10.6 3.6-8.7 3.2-10.6 5.2 MILES NNW OF SITE H-3 8

200 455 374 455 L-40 INDICATOR 0

(2/4)

(3/4)

(2/4)

ILLINOIS RIVER

DOWNSTREAM 245-664 247 - 594 245

664 5.2 MILES NNW OF SITE GAMMA 24 MN-54 15

<LLD

<LLD 0

C0-58 15

<LLD

<LLD 0

FE-59 30

<LLD

<LLD 0

)>

CO-60 15

<LLD

<LLD 0

I.....

ZN-65 30

<LLD

<LLD 0

NB-95 15

<LLD

<LLD 0

ZR-95 30

<LLD

<LLD 0

1-131 15

<LLD

<LLD 0

CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

GROUND WATER H-3 12 200

<LLD

<LLD 0

(PC/ILITER)

GAMMA 12 MN-54 15

<LLD

<LLD 0

C0-58 15

<LLD

<LLD 0

FE-59 30

<LLD

<LLD 0

CO-60 15

<LLD

<LLD 0

ZN-65 30

<LLD

<LLD 0

NB-95 15

<LLD

<LLD 0

ZR-95 30

<LLD

<LLD 0

CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

(M) The Mean Values are calculated using the positive values (values ~ MDC). (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2021 NAME OF FACILITY:

LASALLE COUNTY STATION DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES, IL REPORTING PERIOD:

2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M)

MEAN(M)

STATION#

NONROUTINE (UNITOF ANALYSES ANALYSES OF DETECTION (F)

(F)

{F)

NAME REPORTED MEASUREMENT!

PERFORMED PERFORMED (LLDl RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH GAMMA 12 (PCIIKG WET)

K-40 NA 3117 3122 3122 L-36 CONTROL 0

(818)

(414)

ILLINOIS RIVER - UPSTREAM 2622-3731 2600-3792 2600- 3792 4.3 MILES NE OF SITE MN-54 130

<LLD

<LLD 0

CO-58 130

<LLD

<LLD 0

FE-59 260

<LLD

<LLD 0

CO-60 130

<LLD

<LLD 0

ZN-65 260

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

)>

CS-134 130

<LLD

<LLD 0

I CS-137 150

<LLD

<LLD 0

I\\)

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

SEDIMENT GAMMA 5

(PC//KG DRY)

K-40 NA 11440 31810 31810 L-21 CONTROL 0

(313)

(2/2)

(212)

ILLINOIS RIVER - UPSTREAM 10010-12910 1466-2041 1466 - 2041 4.0 MILES NE OF SITE MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 150

<LLD

<LLD 0

CS-137 180

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

AIR PARTICULATE GR-B 466 10 19.0 20 20 L-10 CONTROL 0

(E-3 PC/ICU.METER)

(409/414)

(52/52)

(52152)

STREATOR 5-39 8-39 8-39 13.5 MILES SW OF SITE (M) The Mean Values are calculated using the positive values (values~ MDC). (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2021 NAME OF FACILITY:

LASALLE COUNTY STATION DOCKET NUMBER:

50-373 & 50-37 4 LOCATION OF FACILITY:

MARSEILLES, IL REPORTING PERIOD:

2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M)

MEAN (M)

MEAN(M)

STATION#

NON ROUTINE (UNITOF ANALYSES ANALYSES OF DETECTION (F)

(F)

NAME REPORTED MEASUREMENr),

PERFORMED PERFORMED (LLDl RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR PARTICULATE GAMMA 36 (E-3 PC/ICU.METER)

Be-7 NA 130 133 133 L-10 CONTROL 0

(32/32)

(4/4)

STREATOR 82 - 183 99-173 99-173 13.5 MILES SW OF SITE CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 50

<LLD

<LLD 0

)>

CS-137 60

<LLD

<LLD 0

I BA-140 NA

<LLD

<LLD 0

<,.)

LA-140 NA

<LLD

<LLD 0

AIR IODINE GAMMA 466 (E-3 PC/ICU.METER)

/-131 70

<LLD

<LLD 0

MILK 1-131 5

1 NA

<LLD 0

(PCIILITER)

GAMMA 5

K-40 NA NA 942 942 L-42 CONTROL 0

(5/5)

BIOS FARM 643-1272 643-1272 14.2 MILES E OF SITE MN-54 NA NA

<LLD 0

CO-58 NA NA

<LLD 0

FE-59 NA NA

<LLD 0

CO-60 NA NA

<LLD 0

ZN-65 NA NA

<LLD 0

NB-95 NA NA

<LLD 0

ZR-95 NA NA

<LLD 0

CS-134 15 NA

<LLD 0

CS-137 18 NA

<LLD 0

BA-140 60 NA

<LLD 0

LA-140 15 NA

<LLD 0

(M) The Mean Values are calculated using the positive values (values~ MDC). (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR THE LASALLE COUNTY STATION, 2021 NAME OF FACILITY:

LASALLE COUNTY STATION DOCKET NUMBER:

50-373 & 50-374 LOCATION OF FACILITY:

MARSEILLES, IL REPORTING PERIOD:

2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M)

MEAN(M)

STATION#

NONROUTINE (UNIT OF ANALYSES ANALYSES OF DETECTION (F)

(F)

NAME REPORTED MEASUREMENTI PERFORMED PERFORMED

!LLDl RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FOOD PRODUCTS GAMMA 20 (PCIIKG WE7J MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

1-131 60

<LLD

<LLD 0

CS-134 60

<LLD

<LLD 0

CS-137 80

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

l>

LA-140 NA I

<LLD

<LLD 0

VEGETATION GAMMA 43 (PCIIKG WET)

MN-54 NA

<LLD

<LLD 0

CO-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

CO-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

1-131 60

<LLD

<LLD 0

CS-134 60

<LLD

<LLD 0

CS-137 80

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

DIRECT RADIATION OSLD-QUARTERL Y 165 NA 18.3 15.4 19.8 L-110 INDICATOR 0

(MILU-ROENTGENIQTR.)

(161/161)

(4/4)

(4/4) 13.5-43.6 14.1

16.8 17.0

21.8 0.6 MILES SSW (M) The Mean Values are calculated using the positive values (values l!'. MDC). (F) Fraction of detectable measurement are indicated in parentheses.

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

Intentionally left blank

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2021 Location A.

Surface Water L-21 L-40 Location Description Illinois River at Seneca, Upstream (control)

Illinois River, Downstream (indicator)

B.

Ground/Well Water L-27 L-28-W4 L-28-W5 L-28-W6 LSCS Onsite Well (indicator)

Marseilles Well (control)

Marseilles Well (indicator)

C.

Milk - bi-weekly / monthly L-42 Biros Farm (control)

D.

Air Particulates I Air Iodine L-01 L-03 L-04 L-05 L-06 L-07 L-08 L-10 L-11A E.

Fish L-34 L-35 L-36 F.

Sediment L-21 L-40 L-41 G.

Food Products Quadrant 1 Quadrant 1 Quadrant 2 Quadrant 2 Quadrant 3 Quadrant 4 Control H.

Vegetation L-Veg C L-ESE 1 L-ESE 2 Nearsite 1 (indicator)

Onsite 3 (indicator)

Rte. 170 (indicator)

Onsite 5 (indicator)

Nearsite 6 (indicator)

Seneca (indicator)

Marseilles (indicator)

Streator (control)

Ransom (indicator)

LaSalle Cooling Lake (indicator)

Marseilles Pool of Illinois River, Downstream (indicator)

Illinois River, Upstream of Discharge (control)

Illinois River at Seneca, Upstream (control)

Illinois River, Downstream (indicator)

Illinois River, Downstream (indicator) 171 Valley View, Seneca IL 281 E. Lincoln, Seneca IL 106 W. Thomas, Ransom, IL 205 W. Plumb, Ransom IL 1814 E. 25th Rd., Ransom IL 2507 N. 2553 Rd., Marseilles IL Biros Farm Control Indicator Indicator 8-1 Distance & Direction From Site 4.0 miles NE 5.2 miles NNW O miles at station 7.0 miles NNW 6.7 miles NNW 4.1 miles N 14.2 miles E 1.5 miles NNW 1.0 miles ENE 3.2 miles E 0.3 miles ESE 0.4 miles W 5.2 miles NNE 6.0 miles NNW 13.5 miles SW 6.0 miles S 2.0 miles E 6.5 miles NNW 4.3 miles NE 4.0 miles NE 5.2 miles NNW 4.6 miles N 5.2 miles NE 5.1 miles NE 6.0 miles S 5.3 miles S 3.5 miles SW 4.3 miles NNW 14.2 miles E 9.5 miles ENE 1.5 miles ESE 6.0 miles ESE

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2021 Location Location Description I.

Environmental Dosimetry - OSLD Inner Ring L-101-1 and -2 L-102-1 and -2 L-103-1 and -2 L-104-1 and -2 L-105-1 and -2 L-106-1 and -2 L-107-1 and -2 L-108-1 and -2 L-109-1 and -2 L-110-1 and -2 L-111 b-1 and -2 L-112-1 and -2 L-113a-1 and-2 L-114-1 and -2 L-115-1 and -2 L-116-1 and -2 Outer Ring L-201-3 and -4 L-202-3 and -4 L-203-1 and -2 L-204-1 and -2 L-205A-1 and -2 L-2058-3 and -4 L-206-1 and -2 L-207-1 and -2 L-208-1 and -2 L-209-1 and -2 L-210-1 and -2 L-211-1 and -2 L-212-1 and -2 L-213-3 and -4 L-214-3 and -4 L-215-3 and -4 L-216-3 and -4 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-11A-1 and -2 Nearsite 1 (indicator)

Onsite 3 (indicator)

Rte. 170 (indicator)

Onsite 5 (indicator)

Nearsite 6 (indicator)

Seneca (indicator)

Marseilles (indicator)

Ransom (indicator)

Control and Special Interest L-10-1 and -2 Streator B-2 Distance & Direction From Site 0.5 miles N 0.6 miles NNE 0.7 miles NE 0.8 miles ENE 0.7 miles E 1.4 miles ESE 0.8 miles SE 0.5 miles SSE 0.6 miles S 0.6 miles SSW 0.8 miles SW 0.9 miles WSW 0.8 miles W 0.9 miles WNW 0.7miles NW 0.6 miles NNW 4.0 miles N 3.6 miles NNE 4.0 miles NE 3-2 miles ENE 3.2 miles ESE 5.1 miles E 4.3 miles SE 4.5 miles SSE 4.5 miles S 4.0 miles SSW 3.3 miles SW 4.5 miles WSW 4.0miles W 4.9 miles W

5. 1 miles WNW 5.0 miles NW 5.0 miles NNW 1.5 miles NNW 1.0 miles ENE 3.2 miles E 0.3 miles ESE 0.4 miles W 5.2 miles NNE 6.0 miles NNW 6.0 miles S 13.5 miles SW

TABLE 8-2:

Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2021 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Water Gamma Monthly composite from TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Spectroscopy weekly grab samples.

Surface Water Gross Beta Monthly composite from TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices weekly grab samples.

Surface Water Tritium Quarterly composite from TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation weekly grab samples.

Ground/Well Gamma Quarterly grab samples.

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Water Spectroscopy Ground/Well Tritium Quarterly grab samples.

TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Water Gamma Semi-annual samples TBE-2007 Gamma-Emitting Radioisotope Analysis Fish Spectroscopy collected via electroshocking or other techniques Sediment Gamma Semi-annual TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Spectroscopy grab samples Air One-week composite of TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices Particulates Gross Beta continuous air sampling through glass fiber filter paper Air Gamma Quarterly composite of each TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Particulates Spectroscopy station Gamma Bi-weekly composite of TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Air Iodine continuous air sampling Spectroscopy through charcoal filter Bi-weekly grab sample when TBE, TBE-2012 Radioiodine in Various Matrices Milk 1-131 cows are on pasture.

Monthly all other times Gamma Bi-weekly grab sample when Milk Spectroscopy cows are on pasture.

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Monthly all other times Food Gamma Annual grab samples.

TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Products Spectroscopy Vegetation Gamma Monthly grab samples during TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Spectroscopy growing season Optically Quarterly OSLDs comprised Stimulated OSLO Luminescence of two Al2O3:C Landauer Landauer Incorporated Dosimetry Incorporated elements.

8-3

8-4

Figure B-2 Outer Ring OSLD Locations and Fixed Air Sampling Locations of the LaSalle County Station, 2021 B-5

Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2021 B-6

)

N

APPENDIX C DATA TABLES AND FIGURES

Intentionally left blank

Table C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 Table C-I.2 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD L-21 L-40 01/07/21 - 01/28/21 5.2 +/- 2.2 3.2 +/- 2.1 02/03/21 - 02/25/21 8.5 +/- 2.4 7.8 +/- 2.3 03/03/21 - 03/31/21 6.2 +/- 2.5 7.2 +/- 2.6 04/07/21 - 04/29/21 8.7 +/- 2.7 6.7 +/- 2.7 05/05/21 - 05/27/21 8.0 +/- 2.2 5.9 +/- 2.1 06/02/21 - 06/30/21 3.6 +/- 2.2 4.2 +/- 2.2 07/07/21 - 07/29/21 6.0 +/- 2.4 6.0 +/- 2.4 08/04/21 - 08/26/21 5.2 +/- 2.4

< 3.2 09/01/21 - 09/29/21 5.8 +/- 2.4 5.2 +/- 2.3 10/07/21 - 10/28/21 4.5 +/- 2.3 3.5 +/- 2.3 11/03/21 - 11/26/21 6.5 +/- 2.1 10.6 +/- 2.7 12/01/21 - 12/29/21 5.8 +/- 2.2 8.9 +/- 2.5 (1) MEAN+/- 2 STD DEV 6.2 +/- 3.1 6.3 +/- 4.6 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/UTER +/- 2 SIGMA COLLECTION PERIOD L-21 L-40 01/07/21 - 03/31/21 594 +/- 142 664 +/- 154 04/07/21 - 06/30/21

< 183

< 186 07/07/21 - 09/29/21 282 +/- 129 245 +/- 129 10/07/21 - 12/29/21 247 +/- 124

< 191 (1) MEAN+/- 2 STD DEV 374 +/- 382 455 +/- 593 (1) THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (VALUES~ MDC)

C-1

Table C-1.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 L-21 01/07/21 - 01/28/21

< 2

<4

< 2

<4

<2

< 3

< 7

< 2

< 16

< 6 02/03/21 - 02/25/21

< 3

< 8

<4

< 7

<4

< 7

< 12

<4

< 3

< 26

< 9 03/03/21 - 03/31/21

< 2

<2

< 5

< 2

<4

< 2

<4

<9

<2

< 17

<6 04/07/21 - 04/29/21

< 2

<6

< 3

< 5

< 3

<4

< 9

< 2

< 3

< 18

< 7 05/05/21 - 05/27 /21

< 2

< 5

< 2

<4

< 2

<4

< 8

< 2

< 16

< 5 06/02/21 - 06/30/21

< 2

<4

< 2

< 3

< 2

<4

< 10

< 2

< 18

< 6 07/07/21 - 07/29/21

< 2

< 5

<2

< 4

< 2

<4

<9

<2

< 17

<6 08/04/21 - 08/26/21

< 2

< 5

< 2

< 5

< 2

<4

< 10

< 3

< 2

< 20

< 6 09/01/21 - 09/29/21

< 2

< 4

< 2

< 3

< 2

< 3

< 11

< 2

< 18

< 6 10/07/21 - 10/28/21

< 4

< 9

<4

< 9

<4

< 5

< 15

< 4

< 31

< 10 11/03/21 - 11/26/21

< 2

<4

< 2

< 3

< 2

< 3

< 7

< 2

< 13

< 5 12/01/21 - 12/29/21

< 1

< 3

< 1

< 2

< 1

< 2

< 7

< 1

< 12

< 4 MEAN

(')

I I\\)

L-40 01/07/21 - 01/28/21

< 2

< 5

< 2

<4

< 3

<4

< 8

< 2

< 16

< 6 02/03/21 - 02/25/21

< 3

< 6

< 3

< 5

< 3

< 5

< 11

< 3

< 21

< 8 03/03/21 - 03/31/21

< 2

< 5

< 2

<4

< 2

<4

< 11

< 2

< 20

< 6 04/07/21 - 04/29/21

< 2

< 3

< 5

<2

< 5

< 2

<4

<9

< 3

<2

< 20

< 6 05/05/21 - 05/27 /21

< 2

< 5

<2

<4

< 2

< 4

< 9

< 2

< 18

< 5 06/02/21 - 06/30/21

< 2

< 5

< 2

<4

< 2

<4

< 11

< 2

< 20

< 7 07/07/21 - 07/29/21

< 2

< 5

< 2

< 5

< 2

< 5

< 9

< 3

< 2

< 17

< 5 08/04/21 - 08/26/21

< 2

< 3

< 5

<2

< 5

< 3

< 5

< 9

< 3

< 19

< 7 09/01/21 - 09/29/21

< 2

< 5

< 2

<4

<2

<4

< 12

< 2

< 21

< 8 10/07/21 - 10/28/21

<4

< 8

<4

< 7

< 4

< 6

< 14

<4

< 30

< 9 11/03/21 - 11/26/21

< 2

< 5

< 2

< 4

< 2

<4

< 7

< 2

< 15

< 5 12/01/21 - 12/29/21

< 1

< 2

<4

< 2

< 3

< 2

< 3

< 9

< 2

< 15

< 5 MEAN

Table C-I1.1 CONCENTRATIONS OF TRITIUM IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD L-27 L-28-W4 L-28-WS L-28-W6 01/13/21 - 01/13/21

< 187

< 188

< 188 04/07/21 - 04/07/21

< 187

< 182 07/07/21 - 07/07/21

< 184

< 177

< 180 10/13/21 - 10/13/21

< 177

< 171 MEAN C-3

Table C-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 L-27 01/13/21 - 01/13/21

<4

< 11

< 5

< 7

< 5

< 8

< 6

< 4

< 25

< 8 04/15/21 - 04/15/21

< 6

< 7

< 14

< 6

< 16

< 7

< 12

< 8

< 7

< 27

< 10 07/07/21 - 07/07/21

< 7

< 15

< 9

< 15

< 8

< 14

< 7

<9

< 20

< 8 10/13/21 - 10/13/21

< 3

<6

< 3

< 6

<4

< 7

<4

< 16

< 7 MEAN L-28-W4 04/07/21 - 04/07/21

< 5

<4

< 9

< 5

< 10

<4

< 7

< 6

< 4

< 21

< 8 10/13/21 - 10/13/21

< 5

< 10

<4

< 7

<4

< 9

< 5

< 6

< 20

< 7 MEAN L-28-W5 01/13/21 - 01/13/21

< 6

< 5

< 10

< 6

< 12

< 5

< 9

< 6

< 5

< 28

< 8 07/07/21 - 07/07/21

< 7

< 13

< 8

< 14

< 9

< 12

< 8

< 9

< 32

< 12 0

MEAN I.,:..

L-28-W6 01/13/21 - 01/13/21

< 6

< 12

< 7

< 11

< 6

< 9

< 5

< 30

< 7 04/07/21 - 04/07/21

<4

< 8

< 6

< 8

< 5

< 7

<4

< 4

< 21

< 6 07/07/21 - 07/07/21

< 6

<6

< 14

<7

< 15

< 7

< 8

< 7

< 6

< 22

< 12 10/13/21 - 10/13/21

< 4

<4

< 8

<4

< 7

< 5

< 8

<4

< 5

< 20

< 7 MEAN

Table C-111.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 L-34 Bluegill 05106121

< 43

< 35

< 91

< 29

< 85

< 34

< 66

< 32

< 37

< 156

< 67 Largemouth Bass 05106121

< 36

< 30

< 71

< 26

< 53

< 30

< 48

< 35

< 32

< 152

< 53 Bluegill 10111/21

< 46

< 49

< 66

< 62

< 119

< 50

< 69

< 54

< 46

< 283

< 70 Largemouth Bass 10/11/21

< 37

< 61

< 91

< 55

< 111

< 56

< 105

< 71

< 60

< 309

< 106 MEAN L-35 Channel Catfish 05/05/21

< 48

< 42

< 104

< 61

< 75

< 53

< 90

< 42

< 47

< 245

< 51 Smallmouth Buffalo 05105121

< 50

< 49

< 108

< 49

< 93

< 65

< 82

< 64

< 50

< 292

< 80 Channel Catfish 10/11/21

< 58

< 54

< 107

< 58

< 123

< 64

< 84

< 70

< 42

< 268

< 79 Sma/lmouth Bass 10/11/21

< 58

< 66

< 174

< 70

< 140

< 66

< 122

< 65

< 55

< 408

< 106 C')

MEAN I tn L-36 Smallmouth Buffalo 05/05/21

< 50

< 60

< 100

< 66

< 108

< 57

< 88

< 54

< 60

< 269

< 62 Channel Catfish 05/05/21

< 39

< 42

< 85

< 47

< 93

< 42

< 75

< 65

< 56

< 211

< 75 Sma/lmouth Bass 10/11/21

< 80

< 83

< 184

< 104

< 157

< 100

< 179

< 86

< 76

< 516

< 98 Channel Catfish 10/11/21

< 53

< 42

< 110

< 61

< 112

< 53

< 94

< 36

< 54

< 250

< 85 MEAN

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/KG DRY+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 L-21 05/25/21

< 76

< 82

< 204

< 100

< 189

< 85

< 154

< 108

< 109

< 382 124 10/12/21

< 64

< 58

< 141

< 58

< 127

< 67

< 113

< 86

< 82

< 425 103 MEAN L-40 05/25/21

< 83

< 80

< 175

< 85

< 172

< 86

< 156

< 87

< 101

< 315

< 130 10/12/21

< 64

< 59

< 145

< 69

< 128

< 68

< 105

< 68

< 60

< 365

< 80 MEAN L-41 05/25/21 (1)

L-41 10/11/21

< 42

< 57

< 129

< 63

< 109

< 55

< 85

< 61

< 52

< 280

< 95 0

MEAN I 0)

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP Ill GROUP IV PERIOD L-03 L-05 L-01 L-06 L-04 L-07 L-08 L-11A L-10 12/30/20 - 01/07/21 19 +/- 4 23 +/- 4 28 +/- 14 18 +/- 4 21 +/- 4 24 +/- 4 23 +/- 4 19 +/- 4 22 +/- 4 01/07/21 - 01/13/21 18 +/- 5 17 +/- 5 18 +/- 5 18 +/- 5 19 +/- 5 16 +/- 5 17 +/- 5 18 +/- 5 22 +/- 5 01/13/21 - 01/20/21 19 +/- 5 23 +/- 5 21 +/- 5 20 +/- 5 21 +/- 5 23 +/- 5 22 +/- 5 19 +/- 5 24 +/- 5 01/20/21 - 01/28/21 12 +/- 3 12 +/- 4 13 +/- 4 12 +/- 4 10 +/- 3 13 +/- 4 12 +/- 3 9 +/- 3 11 +/- 3 01/28/21 - 02/03/21 13 +/- 5 15 +/- 5 15 +/- 5 17 +/- 5 13 +/- 5 16 +/- 5 13 +/- 4 15 +/- 5 14 +/- 5 02/03/21 - 02/11/21 31 +/- 5 36 +/- 5 38 +/- 5 33 +/- 5 34 +/- 5 34 +/- 5 33 +/- 5 32 +/- 5 28 +/- 5 02/11/21 - 02/18/21 18 +/- 3 21 +/- 5 19 +/- 4 28 +/- 6 23 +/- 5 21 +/- 5 16 +/- 4 21 +/- 4 19 +/- 4 02/18/21 - 02/25/21 (1) 26 +/- 5 22 +/- 5 26 +/- 5 24 +/- 5 24 +/- 5 18 +/- 4 28 +/- 5 29 +/- 5 02/25/21 - 03/03/21 22 +/- 5 19 +/- 5 19 +/- 5 21 +/- 5 24 +/- 5 23 +/- 5 25 +/- 5 17 +/- 5 19 +/- 5 03/03/21 - 03/11/21 16 +/- 4 21 +/- 4 18 +/- 4 20 +/- 4 16 +/- 4 18 +/- 4 14 +/- 3 17 +/- 4 20 +/- 4 03/11/21 - 03/18/21 14 +/- 4 12 +/- 4 14 +/- 4 11 +/- 4 14 +/- 4 9+/-4 12 +/- 4 12 +/- 4 16 +/- 4 03/18/21 - 03/25/21 14 +/- 4 16 +/- 4 18 +/- 5 16 +/- 4 16 +/- 4 15 +/- 4 19 +/- 5 17 +/- 4 16 +/- 4 03/25/21 - 03/31/21 14 +/- 5 9 +/- 5 16 +/- 5 16 +/- 5 12 +/- 5 11 +/- 5 11 +/- 5 14 +/- 5 12 +/- 5 03/31/21 - 04/07/21 18 +/- 4 14 +/- 4 17 +/- 4 17 +/- 4 13 +/- 4 17 +/- 4 18 +/- 4 14 +/- 4 12 +/- 4 04/07/21 - 04/15/21 8 +/- 4

< 5 6 +/- 3

< 5 8 +/- 4 6 +/- 3

< 5

< 5 8 +/- 4 04/15/21 - 04/22/21 12 +/- 4 11 +/- 4 15 +/- 4 14 +/- 4 12 +/- 4 13 +/- 4 14 +/- 4 14 +/- 4 13 +/- 4 04/22/21 - 04/29/21 23 +/- 5 18 +/- 5 22 +/- 6 20 +/- 5 24 +/- 5 21 +/- 5 25 +/- 5 18 +/- 4 20 +/- 5 04/29/21 - 05/05/21 17 +/- 5 14 +/- 4 (1) 14 +/- 5 13 +/- 5 12 +/- 4 15 +/- 5 18 +/- 5 16 +/- 5 05/05/21 - 05/13/21 7 +/- 3 12 +/- 3 10 +/- 4 11 +/- 3 12 +/- 3 8+/-3 10 +/- 3 9 +/- 3 10 +/- 3 05/13/21 - 05/20/21 16 +/- 5 15 +/- 5 14 +/- 4 18 +/- 5 13 +/- 4 18 +/- 5 18 +/- 5 16 +/- 4 22 +/- 5 05/20/21 - 05/27/21 17 +/- 5 16 +/- 5 10 +/- 4 19 +/- 5 15 +/- 5 15 +/- 5 12 +/- 4 13 +/- 4 17 +/- 5 05/27/21 - 06/02/21 14 +/- 4 14 +/- 4 19 +/- 5 19 +/- 5 18 +/- 5 17 +/- 5 16 +/- 5 15 +/- 5 17 +/- 5 06/02/21 - 06/10/21 15 +/- 3 19 +/- 4 16 +/- 3 18 +/- 4 18 +/- 4 19 +/- 4 17 +/- 4 14 +/- 3 14 +/- 4 06/10/21 - 06/17/21 16 +/- 4 12 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 13 +/- 4 18 +/- 4 14 +/- 4 15 +/- 4 06/17/21 - 06/24/21 19 +/- 5 20 +/- 5 18 +/- 5 17 +/- 4 17 +/- 4 19 +/- 5 17 +/- 4 17 +/- 4 20 +/- 5 06/24/21 - 06/30/21 7+/-4 7+/-4 6 +/- 4 8 +/- 4 8 +/- 4

<6 7 +/- 4 5 +/- 4 8 +/- 4 06/30/21 - 07/07/21 15 +/- 4 14 +/- 4 14 +/- 4 14 +/- 4 17 +/- 5 14 +/- 4 17 +/- 4 10 +/- 4 17 +/- 5 07/07/21 - 07/14/21 15 +/- 4 8 +/- 4 12 +/- 4 11 +/- 4 15 +/- 4 16 +/- 4 11 +/- 4 15 +/- 4 11 +/- 4 07/14/21 - 07/22/21 18 +/- 4 16 +/- 4 19 +/- 4 16 +/- 4 16 +/- 4 17 +/- 4 14 +/- 4 13 +/- 4 18 +/- 4 07/22/21 - 07/29/21 32 +/- 5 33 +/- 5 27 +/- 5 29 +/- 5 30 +/- 5 26 +/- 5 25 +/- 5 30 +/- 5 34 +/- 5 07/29/21 - 08/04/21 17 +/- 5 16 +/- 5 16 +/- 5 16 +/- 5 11 +/- 5 17 +/- 5 14 +/- 5 16 +/- 5 23 +/- 6 08/04/21 - 08/12/21 22 +/- 4 22 +/- 4 24 +/- 5 22 +/- 4 23 +/- 4 21 +/- 4 24 +/- 5 22 +/- 4 25 +/- 5 08/12/21 - 08/19/21 26 +/- 9 18 +/- 5 22 +/- 5 23 +/- 5 17 +/- 5 19 +/- 5 21 +/- 5 19 +/- 5 23 +/- 5 08/19/21 - 08/26/21 25 +/- 5 21 +/- 5 29 +/- 5 20 +/- 5 20 +/- 5 24 +/- 5 24 +/- 5 25 +/- 5 28 +/- 5 08/26/21 - 09/01/21 21 +/- 5 21 +/- 5 21 +/- 5 23 +/- 5 18 +/- 5 28 +/- 5 22 +/- 5 22 +/- 5 27 +/- 5 09/01/21 - 09/09/21 22 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 20 +/- 4 20 +/- 4 22 +/- 4 22 +/- 4 18 +/- 4 09/09/21 - 09/16/21 22 +/- 4 25 +/- 5 30 +/- 5 27 +/- 5 25 +/- 5 24 +/- 4 26 +/- 5 27 +/- 5 25 +/- 5 09/16/21 - 09/23/21 24 +/- 5 20 +/- 5 20 +/- 5 22 +/- 5 17 +/- 5 20 +/- 5 17 +/- 5 22 +/- 5 20 +/- 5 09/23/21 - 09/29/21 27 +/- 6 27 +/- 6 23 +/- 5 28 +/- 6 27 +/- 6 24 +/- 6 25 +/- 6 28 +/- 6 25 +/- 6 09/29/21 - 10/07/21 27 +/- 5 26 +/- 4 22 +/- 4 26 +/- 4 26 +/- 4 32 +/- 5 25 +/- 4 25 +/- 4 25 +/- 4 10/07/21 - 10/13/21 25 +/- 5 23 +/- 5 27 +/- 5 23 +/- 5 23 +/- 5 27 +/- 5 21 +/- 4 21 +/- 4 23 +/- 5 10/13/21 - 10/21/21 29 +/- 5 26 +/- 4 24 +/- 4 26 +/- 4 23 +/- 4 28 +/- 5 25 +/- 4 23 +/- 4 23 +/- 4 10/21/21 - 10/28/21 13 +/- 4 10 +/- 4 11 +/- 4 9+/-4 11 +/- 4 15 +/- 4 10 +/- 4 8+/-4 13 +/- 4 10/28/21 - 11/03/21 13 +/- 4 17 +/- 4 14 +/- 4 15 +/- 4 16 +/- 4 12 +/- 4 11 +/- 4 12 +/- 4 16 +/- 4 11/03/21 - 11/10/21 32 +/- 5 25 +/- 5 28 +/- 5 25 +/- 5 31 +/- 5 29 +/- 5 35 +/- 5 26 +/- 5 31 +/- 5 11/10/21 - 11/19/21 15 +/- 4 14 +/- 4 17 +/- 4 15 +/- 3 17 +/- 4 14 +/- 4 17 +/- 4 15 +/- 3 16 +/- 4 11/19/21 - 11/26/21 20 +/- 5 26 +/- 5 24 +/- 5 21 +/- 5 20 +/- 5 21 +/- 5 21 +/- 5 23 +/- 5 20 +/- 5 11/26/21 - 12/01/21 27 +/- 6 15 +/- 5 25 +/- 6 25 +/- 6 23 +/- 6 28 +/- 7 19 +/- 6 23 +/- 6 25 +/- 6 12/01/21 - 12/09/21 17 +/- 4 18 +/- 4 16 +/- 4 23 +/- 5 20 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 21 +/- 4 12/09/21 - 12/16/21 19 +/- 5 21 +/- 5 18 +/- 5 18 +/- 5 21 +/- 5 21 +/- 5 20 +/- 5 15 +/- 5 21 +/- 5 12/16/21 - 12/23/21 26 +/- 5 36 +/- 6 31 +/- 5 26 +/- 5 26 +/- 5 33 +/- 5 34 +/- 5 32 +/- 5 33 +/- 5 12/23/21 - 12/29/21 39 +/- 6 35 +/- 6 32 +/- 6 38 +/- 6 37 +/- 6 35 +/- 6 37 +/- 6 35 +/- 6 39 +/- 6 (2) MEAN+/- 2 STD DEV 19 +/- 13 19 +/- 14 19 +/- 13 20 +/- 12 19 +/- 13 20 +/- 13 19 +/- 13 19 +/- 13 20 +/- 13 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION (2) THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (VALUES~ MDC)

C-7

Table C-V.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP I-ONSITE LOCATIONS GROUP II - NEAR-SITE LOCATIONS GROUP 111-FAR-FIELD LOCATIONS GROUP IV-CONTROL LOCATION COLLECTION MIN MAX MEAN +/-

COLLECTION MIi\\ MAX MEAN +/-

COLLECTION MIN MAX MEAN +/-

COLLECTION MIi\\ MAX MEAN +/-

PERIOD 2SD PERIOD 2SD PERIOD 2SD PERIOD 2SD 12/30/20 - 02/03/21 12 23 17 +/- 8 12/30/20 - 02/03/21 12 28 18 +/- 9 12/30/20 - 02/03/21 9

24 17 +/- 9 12/30/20 - 02/03/21 11 24 18 +/- 11 02/03/21 - 03/03/21 18 36 25 +/- 13 02/03/21 - 03/03/21 19 38 26 +/- 14 02/03/21 - 03/03/21 16 34 25 +/- 12 02/03/21 - 03/03/21 19 29 24 +/- 11 03/03/21 - 03/31/21 9

21 14 +/- 6 03/03/21 - 03/31/21 11 20 16 +/- 5 03/03/21 - 03/31/21 9

19 14 +/- 6 03/03/21 - 03/31/21 12 20 16 +/- 6 03/31/21 - 04/29/21 8

23 15 +/- 11 03/31/21 - 04/29/21 6

22 16 +/- 10 03/31/21 - 04/29/21 6

25 15 +/- 11 03/31 /21 - 04/29/21 8

20 13 +/- 10 04/29/21 - 06/02/21 7

17 14 +/- 6 04/29/21 - 06/02/21 10 19 15 +/- 8 04/29/21 - 06/02/21 8

18 14 +/- 6 04/29/21 - 06/02/21 10 22 16 +/- 9 06/02/21 - 06/30/21 7

20 15 +/- 10 06/02/21 - 06/30/21 6

18 14 +/- 9 06/02/21 - 06/30/21 5

19 15 +/- 9 06/02/21 - 06/30/21 8

20 14 +/- 10 06/30/21 - 07/29/21 8

33 19 +/- 18 06/30/21 - 07 /29/21 11 29 18 +/- 13 06/30/21 - 07/29/21 10 30 18 +/- 13 06/30/21 - 07/29/21 11 34 20 +/- 20 07/29/21 -

09/01/21 16 26 21 +/- 6 07/29/21 - 09/01/21 16 29 22 +/- 8 07/29/21 - 09/01/21 11 28 20 +/- 8 07/29/21 - 09/01/21 23 28 25 +/- 5 09/01/21 - 09/29/21 19 27 23 +/- 6 09/01/21 - 09/29/21 19 30 24 +/- 8 09/01/21 - 09/29/21 17 28 23 +/- 7 09/01/21 - 09/29/21 18 25 22 +/- 7 09/29/21 - 11/03/21 10 29 21 +/- 14 09/29/21 - 11/03/21 9

27 20 +/- 14 09/29/21 - 11/03/21 8

32 20 +/- 14 09/29/21 - 11/03/21 13 25 20 +/- 10 11/03/21 - 12/01/21 14 32 22 +/- 14 11/03/21 - 12/01/21 15 28 22 +/- 9 11/03/21 - 12/01/21 14 35 22 +/- 12 11/03/21 - 12/01/21 16 31 23 +/- 12 12/01/21 - 12/29/21 17 39 26 +/- 18 12/01/21 - 12/29/21 16 38 25 +/- 16 12/01/21 - 12/29/21 15 37 27 +/- 16 12/01/21 - 12/29/21 21 39 29 +/- 18 0

I 00 12/30/20 - 12/29/21 7

39 19 +/- 14 12/30/20 - 12/29/21 6

38 20 +/- 13 12/30/20 - 12/29/21 5

37 19 +/- 13 12/30/20 - 12/29/21 8

39 20 +/- 13

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 L-01 12/30/20 - 03/31/21

<4

< 6

< 17

< 3

< 10

< 7

< 11

< 5

<4

< 200

< 81 03/31 /21 - 06/30/21

< 2

< 3

< 12

< 2

< 6

<4

< 5

< 2

<2

< 167

< 84 06/30/21 - 09/29/21

< 2

< 3

< 11

< 3

<6

< 2

<6

< 2

< 124

< 53 09/29/21 - 12/29/21

<4

< 6

< 16

<4

< 8

< 5

< 9

< 4

<3

< 257

< 94 MEAN L-03 12/30/20 - 03/31/21

< 2

<4

< 13

< 3

<6

<4

< 6

< 2

< 118

< 40 03/31 /21 - 06/30/21

< 2

< 3

< 7

< 3

< 6

< 3

<6

< 2

<2

< 140

< 66 06/30/21 - 09/29/21

< 3

<4

< 13

< 3

< 7

<4

< 9

< 3

< 184

< 42 09/29/21 - 12/29/21

< 2

< 3

< 8

< 2

< 6

<4

< 6

< 2

< 134

< 50 MEAN 0

L-04 12/30/20 - 03/31/21

< 3

< 4

< 11

< 3

< 9

< 6

< 3

< 219

< 50 (C) 03/31/21 - 06/30/21

< 2

< 4

< 12

< 2

< 7

<4

< 8

< 2

< 3

< 203

< 69 06/30/21 - 09/29/21

< 2

< 3

< 10

< 2

< 5

< 3

<4

< 2

< 108

< 43 09/29/21 - 12/29/21

< 2

<4

< 12

< 2

< 6

<4

< 5

< 2

< 120

< 79 MEAN L-05 12/30/20 - 03/31/21

< 3

<4

< 12

< 3

< 7

<4

< 7

< 3

< 2

< 144

< 23 03/31 /21 - 06/30/21

< 3

< 5

< 14

< 3

<6

< 6

< 8

<4

< 3

< 206

< 107 06/30/21 - 09/29/21

< 3

<4

< 16

< 3

< 8

< 5

< 9

< 3

< 4

< 177

< 91 09/29/21 - 12/29/21

< 3

<4

< 10

< 3

< 9

< 5

< 8

< 3

< 196

< 54 MEAN L-06 12/30/20 - 03/31/21

< 2

< 3

< 7

< 2

< 5

< 3

< 6

< 3

< 2

< 114

< 43 03/31/21 - 06/30/21

<2

< 2

< 10

< 2

<4

< 2

<6

<2

< 2

< 144

< 42 06/30/21 - 09/29/21

< 2

< 13

< 2

< 5

< 3

< 7

< 2

< 1

< 102

< 56 09/29/21 - 12/29/21

< 2

< 3

< 10

< 2

<4

< 3

< 5

< 2

< 94

< 57 MEAN

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 L-07 12/30/20 - 03/31/21

< 2

< 1

< 10

< 3

< 6

< 3

<6

< 3

< 2

< 119

< 34 03/31/21 - 06/30/21

< 3

< 12

< 3

< 5

< 8

< 3

< 2

< 184

< 80 06/30/21 - 09/29/21

< 3

<4

< 13

<4

< 9

< 5

< 10

< 4

< 3

< 212

< 89 09/29/21 - 12/29/21

< 3

< 5

< 14

<4

< 5

<6

<9

<4

< 3

< 252

< 101 MEAN L-08 12/30/20 - 03/31/21

<4

< 4

< 15

<4

< 8

<6

< 9

< 3

< 165

< 86 03/31/21 - 06/30/21

< 3

< 6

< 15

< 3

< 8

< 6

< 9

<4

< 3

< 250

< 104 06/30/21 - 09/29/21

< 2

< 3

< 8

< 2

< 6

< 3

< 7

< 2

< 148

< 63 09/29/21 - 12/29/21

< 2

< 4

< 12

< 2

< 5

< 3

< 5

< 2

< 131

< 75 MEAN

(")

L-10 12/30/20 - 03/31/21

< 2

< 3

< 7

< 3

< 5

< 3

<6

< 2

< 100

< 41 I

~

0 03/31 /21 - 06/30/21

< 2

< 4

< 11

< 2

< 5

<4

< 7

< 3

< 2

< 146

< 62 06/30/21 - 09/29/21

< 2

< 6

< 2

<4

< 6

< 2

< 118

< 42 09/29/21 - 12/29/21

< 3

<4

< 11

< 3

< 7

< 3

<6

< 3

< 181

< 77 MEAN L-11A 12/30/20 - 03/31/21

< 3

< 5

< 12

< 3

< 7

< 5

< 7

<4

< 3

< 123

< 72 03/31/21 - 06/30/21

< 2

< 9

< 2

<6

< 2

< 5

< 2

< 98

< 55 06/30/21 - 09/29/21

< 2

< 6

< 2

< 5

< 3

< 5

< 2

< 118

< 56 09/29/21 - 12/29/21

< 3

<4

< 7

< 3

< 7

< 3

< 9

< 2

< 139

< 43 MEAN

Table C-Vl.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP Ill GROUP IV PERIOD L-03 L-05 L-01 L-06 L-04 L-07 L-08 L-11A L-10 12/30/20 - 01/07/21

< 22

< 21

< 40

< 20

< 21

< 52

< 34

< 54 01/07/21 - 01/13/21

< 56

< 27

< 56

< 55

< 56

< 53

< 52

< 31 01/13/21 - 01/20/21

< 41

< 46

< 47

< 45

< 43

< 42

< 45

< 23 01/20/21 - 01/28/21

< 37

< 18

< 38

< 36

< 43

< 42

< 40

< 42 01/28/21 - 02/03/21

< 51

< 35

< 50

< 52

< 29

< 57

< 59

< 58 02/03/21 - 02/11/21

< 18

< 26

< 25

< 24

< 25

< 20

< 23

< 23 02/11/21 - 02/18/21

< 16

< 64

< 65

< 47

< 62

< 65

< 69

< 66

< 34 02/18/21 - 02/25/21 (1)

< 47

< 49

< 45

< 58

< 54

< 57

< 28 02/25/21 - 03/03/21

< 62

< 61

< 63

< 45

< 30

< 24

< 47

< 45

< 46 03/03/21 - 03/11/21

< 43

< 44

< 39

< 41

< 40

< 41

< 29 03/11/21 - 03/18/21

< 48

< 42

< 48

< 47

< 49

< 47

< 33 03/18/21 - 03/25/21

< 49

< 48

< 49

< 37

< 34

< 36

< 18

< 36

< 38 03/25/21 - 03/31/21

< 35

< 15

< 37

< 66

< 36

< 68

< 66

< 64

< 33 03/31/21 - 04/07/21

< 65

< 28

< 65

< 58

< 65

< 58

< 57

< 58

< 25 04/07/21 - 04/15/21

< 48

< 47

< 40

< 47

< 42

< 27

< 41

< 44 04/15/21 - 04/22/21

< 42

< 43

< 21

< 43

< 49

< 48

< 34 04/22/21 - 04/29/21

< 53

< 45

< 38

< 52

< 39

< 38

< 24 04/29/21 - 05/05/21

< 33

< 33 (1)

< 38

< 36

< 39

< 38

< 17 05/05/21 - 05/13/21

< 45

< 46

< 47

< 46

< 45

< 31

< 47 05/13/21 - 05/20/21

< 13

< 31

< 30

< 29

< 31

< 30

< 29

< 28

< 18 05/20/21 - 05/27/21

< 53

< 50

< 45

< 53

< 28

< 45

< 44

< 47 05/27/21 - 06/02/21

< 58

< 59

< 60

< 27

< 63

< 66 06/02/21 - 06/10/21

< 40

< 41

< 40

< 39

< 40

< 38

< 19 06/10/21 - 06/17/21

< 48

< 47

< 45

< 48

< 23

< 56

< 53

< 54

< 24 06/17/21 - 06/24/21

< 23

< 39

< 38

< 47

< 45

< 46 06/24/21 - 06/30/21

< 61

< 60

< 55

< 62

< 48

< 55

< 56 06/30/21 - 07/07/21

< 25

< 26

< 24

< 11

< 25

< 11

< 10

< 11 07/07/21 - 07/14/21

< 52

< 26

< 50

< 49

< 51

< 50

< 49

< 35 07/14/21 - 07/22/21

< 32

< 20

< 31

< 33

< 31

< 45

< 44

< 43

< 46 07/22/21 - 07/29/21

< 56

< 29

< 54

< 55

< 56

< 39

< 38

< 23 07/29/21 - 08/04/21

< 50

< 52

< 45

< 43

< 41

< 18 08/04/21 - 08/12/21

< 21

< 36

< 35

< 34

< 33

< 33 08/12/21 - 08/19/21

< 40

< 33

< 31

< 34

< 44

< 43

< 42

< 44 08/19/21 - 08/26/21

< 55

< 53

< 48

< 54

< 48

< 47

< 24

< 48 08/26/21 - 09/01/21

< 15

< 26

< 15

< 28

< 12

< 26

< 27 09/01/21 - 09/09/21

< 50

< 49

< 48

< 50

< 49

< 22

< 47

< 49 09/09/21 - 09/16/21

< 53

< 52

< 36

< 53

< 35

< 21

< 36 09/16/21 - 09/23/21

< 25

< 41

< 39

< 58

< 40

< 30

< 60

< 58

< 62 09/23/21 - 09/29/21

< 59

< 61

< 60

< 27

< 54

< 62

< 62 09/29/21 - 10/07/21

< 25

< 51

< 50

< 31

< 31 10/07/21 - 10/13/21

< 44

< 45

< 21

< 43

< 44

< 30

< 29

< 29 10/13/21 - 10/21/21

< 39

< 37

< 38

< 39

< 37

< 33 10/21/21 - 10/28/21

< 39

< 37

< 31

< 38

< 33

< 31

< 32

< 20 10/28/21 - 11/03/21

< 59

< 57

< 26

< 31

< 12

< 26

< 27

< 27 11 /03/21 - 11/10/21

< 34

< 14

< 33

< 32

< 26

< 25

< 24

< 24 11/10/21 - 11/19/21

< 18

< 37

< 35

< 33

< 33 11/19/21 - 11/26/21

< 41

< 40

< 47

< 41

< 23

< 46

< 46 11 /26/21 - 12/01/21

< 24

< 46

< 40

< 46

< 21

< 40

< 42

< 40 12/01/21 - 12/09/21

< 19

< 32

< 31

< 42

< 42 12/09/21 - 12/16/21

< 49

< 47

< 24

< 48

< 61

< 58

< 59

< 58 12/16/21 - 12/23/21

< 43

< 42

< 38

< 22

< 40

< 39

< 23

< 38 12/23/21 - 12/29/21

< 48

< 47

< 46

< 24

< 34

< 32

< 32 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-11

Table C-Vll.1 CONCENTRATIONS OF I-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION CONTROL FARM PERIOD L-42 03/31/21

< 0.9 05/05/21

< 0.9 05/20/21

< 0.8 10/21/21

< 0.9 11/03/21

< 0.6 MEAN C-12

0 I _.,

(.I)

Table C-Vll.2 COLLECTION SITE PERIOD L-42 03/31/21 05/05/21 05/20/21 10/21/21 11/03/21 MEAN Mn-54

< 8

<6

< 5

< 7

< 7 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140

< 7

< 15

< 8

< 16

< 8

< 14

<6

< 7

< 37

< 9

< 8

< 18

< 9

< 20

< 5

< 12

< 7

< 9

< 26

< 11

< 5

< 11

< 6

< 11

< 6

< 9

<6

< 6

< 22

< 7

<6

< 14

<6

< 16

< 6

< 10

<6

< 7

< 24

< 9

< 8

< 16

< 7

< 16

< 7

< 11

< 8

< 7

< 31

< 9

Table C-Vlll.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 L-42 Hay 06/30/21

< 29

< 70

< 33

< 76

< 28

< 50

< 47

< 29

< 33

< 134

< 41 Hay 07/14/21

< 29

< 34

< 85

< 39

< 89

< 35

< 60

< 50

< 41

< 32

< 129

< 36 Pasturage 07/29/21

< 28

< 25

< 50

< 39

< 64

< 30

< 57

< 46

< 33

< 30

< 137

< 41 Pasturage 08/13/21

< 35

< 37

< 89

< 36

< 101

< 40

< 60

< 50

< 46

< 41

< 165

< 34 Pasturage 08/26/21

< 41

< 31

< 73

< 35

< 90

< 36

< 61

< 41

< 37

< 31

< 137

< 50 Corn leaves 09/09/21

< 30

< 34

< 65

< 30

< 82

< 34

< 50

< 49

< 28

< 35

< 141

< 28 Pasturage 09/09/21

< 30

< 28

< 49

< 39

< 77

< 30

< 56

< 44

< 34

< 30

< 129

< 32 Pasturage 09/23/21

< 41

< 34

< 76

< 40

< 92

< 40

< 54

< 45

< 30

< 43

< 127

< 33 Pasturage 10/07/21

< 30

< 28

< 59

< 32

< 57

< 25

< 58

< 38

< 34

< 30

< 138

< 33 Pasturage 12/01/21

< 19

< 17

< 39

< 19

< 40

< 19

< 32

< 19

< 21

< 20

< 70

< 17 MEAN C')

L-QUAD 1 I....

.i:,.

Red beets 07/14/21

< 34

< 33

< 67

< 42

< 66

< 33

< 73

< 41

< 32

< 31

< 127

< 41 Red beet stem/leaves 07/14/21

< 27

< 70

< 33

< 69

< 35

< 44

< 49

< 28

< 30

< 133

< 27 MEAN L-QUAD 2 Horseradish 07/22/21

< 30

< 22

< 43

< 27

< 48

< 28

< 48

< 40

< 31

< 25

< 121

< 27 Potatoes 07/22/21

< 19

< 20

< 44

< 20

< 49

< 19

< 27

< 26

< 22

< 18

< 78

< 26 Cabbage 07/14/21

< 28

< 34

< 59

< 35

< 42

< 32

< 61

< 36

< 33

< 30

< 112

< 36 MEAN L-QUAD 3 Red beets 07/29/21

< 16

< 37

< 17

< 32

< 18

< 27

< 36

< 17

< 107

< 25 Red beet leaves 08/04/21

< 16

< 15

< 32

< 18

< 34

< 17

< 28

< 24

< 18

< 17

< 74

< 23 Red beet 08/04/21

< 15

< 30

< 16

< 31

< 15

< 27

< 22

< 17

< 73

< 19 MEAN L-QUAD4 Kohlrabi 07/22/21

< 18

< 16

< 43

< 16

< 32

< 17

< 33

< 26

< 22

< 17

< 75

< 19 Carrots 07/22/21

< 29

< 33

< 83

< 35

< 79

< 38

< 67

< 44

< 31

< 33

< 149

< 48 MEAN

Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 L-VEG C Grass 05/20/21

< 17

< 18

< 37

< 17

< 36

< 17

< 29

< 23

< 19

< 18

< 73

< 19 Dandelion 05/20/21

< 21

< 20

< 42

< 19

< 46

< 20

< 36

< 28

< 24

< 23

< 87

< 26 Milkweed 06/17/21

< 31

< 22

< 49

< 26

< 60

< 27

< 51

< 37

< 34

< 31

< 120

< 37 Clover 06/17/21

< 26

< 24

< 40

< 25

< 50

< 23

< 42

< 34

< 31

< 30

< 129

< 39 Milkweed 07/14/21

< 27

< 31

< 67

< 30

< 72

< 33

< 49

< 50

< 36

< 33

< 133

< 40 Grass 07/14/21

< 42

< 41

< 92

< 46

< 88

< 42

< 64

< 52

< 41

< 39

< 149

< 74 Radish 07/14/21

< 30

< 29

< 61

< 33

< 64

< 31

< 51

< 48

< 31

< 32

< 140

< 42 Collard qreens 07/22/21

< 36

< 33

< 79

< 36

< 94

< 38

< 57

< 53

< 35

< 38

< 188

< 43 Swiss chard 07/22/21

< 28

< 26

< 60

< 37

< 73

< 34

< 51

< 47

< 34

< 38

< 137

< 52 Clover 08/12/21

< 31

< 40

< 67

< 45

< 74

< 39

< 66

< 54

< 36

< 44

< 160

< 43 Velvet leaves 08/12/21

< 28

< 35

< 64

< 40

< 90

< 33

< 49

< 47

< 40

< 50

< 154

< 40 Milkweed 09116/21

< 39

< 30

< 71

< 48

< 96

< 43

< 65

< 52

< 37

< 39

< 162

< 43 Clover 09/16/21

< 26

< 32

< 86

< 45

< 67

< 38

< 69

< 54

< 42

< 37

< 196

< 50 Alfalfa 09/16/21

< 16

< 31

< 16

< 36

< 17

< 28

< 29

< 18

< 78

< 21 Grass 10121/21

< 38

< 32

< 81

< 35

< 79

< 34

< 61

< 51

< 40

< 37

< 144

< 38 Dandelion 10/21121

< 26

< 29

< 57

< 31

< 57

< 28

< 47

< 41

< 30

< 29

< 118

< 37 MEAN L-ESE-1 Clover 05/20/21

< 22

< 20

< 47

< 21

< 45

< 22

< 38

< 31

< 23

< 95

< 26

(')

Dandelion 05/20/21

< 14

< 12

< 28

< 16

< 32

< 15

< 23

< 19

< 16

< 15

< 54

< 17 I....

Clover 06117/21

< 32

< 34

< 83

< 31

< 87

< 23

< 62

< 42

< 36

< 34

< 138

< 42 en Grass 06/17/21

< 27

< 23

< 59

< 37

< 53

< 29

< 42

< 43

< 26

< 28

< 123

< 34 Clover 07/14/21

< 33

< 29

< 77

< 28

< 81

< 31

< 68

< 48

< 29

< 43

< 145

< 38 Dandelion 07/14/21

< 28

< 29

< 103

< 37

< 92

< 31

< 67

< 46

< 39

< 44

< 193

< 50 Clover 08/12/21

< 16

< 15

< 34

< 16

< 34

< 15

< 26

< 22

< 17

< 16

< 64

< 20 Grass 08/12/21

< 40

< 31

< 85

< 40

< 90

< 35

< 54

< 48

< 38

< 39

< 150

< 32 Dandelion 09/16/21

< 36

< 38

< 75

< 32

< 75

< 34

< 62

< 57

< 38

< 42

< 158

< 48 Grass 09/16/21

< 33

< 71

< 34

< 75

< 35

< 56

< 51

< 35

< 34

< 152

< 48 Dandelion 10/21/21

< 35

< 38

< 84

< 35

< 81

< 40

< 66

< 55

< 42

< 33

< 161

< 34 Clover 10/21/21

< 47

< 44

< 114

< 46

< 108

< 48

< 84

< 56

< 47

< 49

< 214

< 85 MEAN L-ESE-2 Clover 05/20/21

< 18

< 19

< 37

< 23

< 42

< 20

< 34

< 24

< 21

< 20

< 79

< 21 Dandelion 05/20/21

< 21

< 39

< 21

< 45

< 22

< 38

< 29

< 23

< 21

< 87

< 21 Grass 05/20/21

< 18

< 17

< 36

< 18

< 34

< 17

< 30

< 20

< 19

< 18

< 68

< 23 Pplantain 06/17/21

< 30

< 28

< 51

< 26

< 57

< 29

< 58

< 42

< 40

< 26

< 131

< 19 Dandelion 06/17/21

< 26

< 28

< 49

< 33

< 56

< 27

< 38

< 32

< 23

< 30

< 100

< 32 Plantain 07/14/21

< 26

< 34

< 79

< 32

< 66

< 33

< 51

< 54

< 35

< 33

< 137

< 49 Dandelion 07/14/21

< 33

< 25

< 75

< 27

< 70

< 38

< 68

< 52

< 40

< 37

< 159

< 43 Clover 07/14/21

< 37

< 35

< 70

< 42

< 76

< 30

< 63

< 53

< 36

< 39

< 176

< 49 Plantain 08/12/21

< 31

< 36

< 51

< 30

< 66

< 31

< 46

< 53

< 43

< 33

< 187

< 50 Clover 08/12/21

< 37

< 36

< 84

< 35

< 80

< 41

< 61

< 54

< 35

< 36

< 163

< 53 Clover 09/16/21

< 41

< 36

< 77

< 38

< 81

< 38

< 64

< 55

< 34

< 32

< 140

< 41 Plantain 09/16/21

< 48

< 31

< 86

< 46

< 102

< 42

< 76

< 56

< 39

< 33

< 193

< 61 Dandelion 09/16/21

< 19

< 18

< 38

< 19

< 38

< 17

< 31

< 29

< 20

< 18

< 83

< 24 Clover 10121/21

< 33

< 34

< 84

< 42

< 73

< 34

< 53

< 41

< 47

< 140

< 33 Dandelion 10/21/21

< 31

< 34

< 81

< 47

< 79

< 36

< 57

< 54

< 38

< 41

< 160

< 40 MEAN

Table C-IX.1 QUARTERLY DLR RESULTS FOR LASALLE COUNTY STATION, 2021 Location L-01 L-03 L-04 L-05 L-06 L-07 L-08 L-10 L-101 L-102 L-103 L-104 L-105 L-106 L-107 L-108 L-109 L-110 L-111B L-112 L-113A L-114 L-115 L-116 L-11A L-201 L-202 L-203 L-204 L-205A L-205B L-206 L-207 L-208 L-209 L-210 L-211 L-212 L-213 L-214 L-215 L-216 Location Annual Annual Qtrly Ba+

2021 Normalized Net Dose, Max Normalized BA+

Facility Facility

Baseline, MDDa (mrem/std. Qtr.)

Annual Dose, B/l MDDA121 Dose, FA

Dose, MA (mrem/yr)

FA >10 Ba (mrem) 1 I 2

I 3

I 4

(mrem) mrem 13,30 22.0 17.4 19.0 17_9 20,1 74.4 53.1 87.3 ND No 11.90 20,6 17.1 17.6 18.8 20.2 73.7 45.3 79,5 ND No 12.00 20.7 15.6 17.4 17.9 17,9 68.7 45.6 79.8 ND No 11,70 20.4 16.2 17.5 18.4 19.5 71.6 46.8 81.0 ND No 13.20 21.9 16.5 18.7 19.7 19.9 74.8 53.0 87.2 ND No 12.90 21.6 16.9 16.9 18.6 19.7 72.1 51.5 85,7 ND No 12.50 21.2 16.7 17.4 18.9 17.5 70.5 50.1 84.3 ND No 1000 18,7 14.1 15.7 15.1 16.8 61.6 39.8 74,0 ND No 13.30 22.0 17.9 17.6 17.8 19.8 73,1 50.4 84.6 ND No 14.90 23.6 18.9 18.8 (3) 21.6 59.2 59.5 93.7 ND No 12.30 21.0 17.2 17.8 17.9 19.7 72.6 49.2 83.4 ND No 11.60 20.3 16.5 17.1 17.2 20.4 71,2 46.3 80.5 ND No 13.30 22.0 17.8 18.5 20.2 20.4 76.9 53.2 87.4 ND No 12.30 21.0 15.6 18.3 17,5 18.8 70.1 49.2 83.4 ND No 12.80 21.5 14.4 18.6 18.7 19.9 71.6 51.2 85.4 ND No 11.10 19.8 18.6 18.5 19.2 20.7 77.0 44.3 78.5 ND No 12.90 21.6 16.7 18.8 18.2 20.3 73.9 51.6 85.8 ND No 12.40 21.1 17,9 17.9 18.8 20.0 74.5 49.7 83.9 ND No 13.10 21.8 17.0 19,6 20.8 21.8 79.2 52.3 86.5 ND No 12.40 21.1 15.8 18.8 18.8 19,0 72.4 49.6 83.8 ND No 13.80 22.5 18.1 20.3 19.2 21.4 78.9 55.2 89.4 ND No 13.10 21.8 16.6 20.3 19.9 18.8 75,6 50.0 84.2 ND No 11.20 19,9 17.2 17.9 17.4 19.9 72.4 44,8 79.0 ND No 11.20 19.9 16.2 16.3 17.3 18.9 68,7 44.8 79.0 ND No 10.30 19,0 15.2 16.2 17,7 17.6 66.7 41.2 75.4 ND No 11.00 19.7 13.5 14.9 14.3 15,3 58.0 43.8 78.0 ND No 10.20 18,9 15.2 17.3 15.5 17.1 65.1 40,9 75,1 ND No 12.80 21.5 17.8 17.6 19.0 19,5 73.9 51.1 85.3 ND No 13.30 22.0 18.1 19.3 18.9 21.6 77.9 50,7 84.9 ND No 12.20 20.9 16.4 19.0 19.1 19.9 74.4 48.8 83.0 ND No 12.00 20.7 164 19.0 19.1 19.9 74.4 45.7 79.9 ND No 12.90 21.6 17.0 18.1 18.2 19.5 72.8 51.6 85.8 ND No 12.10 20.8 16.9 17.8 17,5 19.6 71.8 48.5 82.7 ND No 13.10 21.8 17.1 19.5 19.1 20.6 76.1 44.6 78.8 ND No 12.40 21.1 16.4 (3) 18.9 19.4 54,7 47.2 81.4 ND No 13.70 22.4 18.2 19.6 20.0 20.9 78.6 51.9 86.1 ND No 13.50 22.2 17.4 18.7 19.9 19,9 75,8 54.1 88.3 ND No 13.30 22.0 (3) 17.7 19.3 20.7 57.6 50.5 84,7 ND No 11.50 20.2 16.5 17.8 18.6 19.3 72.1 41.6 75.8 ND No 11.90 20,6 16 8 17.9 19.4 19.2 73.2 47.6 81.8 ND No 13.6 22.3 18.2 19.9 19.1 20.6 77.7 54.4 88.6 ND No 13.4 22.1 17.5 17.7 18.2 20.7 74,0 53.5 87.7 ND No 111 Baseline background dose (BA): The estimated mean background radiation dose at each field monitoring location annually based on historical measurements, excluding any dose contribution from the monitored facility 121 Minimum differential dose (MDDA): The smallest amount of facility related dose at each monitored location annually above the baseline background dose that can be reliably detected by an environmental dosimetry system (3) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-16

Table C-IX.1 QUARTERLY OSLO RESULTS FOR LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF MILLIREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT-DEC CODE

+/-2S.D.

L-01 18.6 +/- 2.4 17.4 19.0 17.9 20.1 L-03 18.4 +/- 2.8 17.1 17.6 18.8 20.2 L-04 17.2 +/- 2.2 15.6 17.4 17.9 17.9 L-05 17.9 +/- 2.8 16.2 17.5 18.4 19.5 L-06 18.7 +/- 3.2 16.5 18.7 19.7 19.9 L-07 18.0 +/- 2.8 16.9 16.9 18.6 19.7 L-08 17.6 +/- 1.8 16.7 17.4 18.9 17.5 L-10 15.4 +/- 2.2 14.1 15.7 15.1 16.8 L-11A 18.3 +/- 2.1 17.9 17.6 17.8 19.8 L-101 19.7 +/- 3.2 18.9 18.8 (1) 21.6 L-102 18.2 +/- 2.2 17.2 17.8 17.9 19.7 L-103 17.8 +/- 3.5 16.5 17.1 17.2 20.4 L-104 19.2 +/- 2.5 17.8 18.5 20.2 20.4 L-105 17.5 +/- 2.8 15.6 18.3 17.5 18.8 L-106 17.9 +/- 4.8 14.4 18.6 18.7 19.9 L-107 19.2 +/- 2.0 18.6 18.5 19.2 20.7 L-108 18.5 +/- 3.0 16.7 18.8 18.2 20.3 L-109 18.6 +/- 2.0 17.9 17.9 18.8 20.0 L-110 19.8 +/- 4.1 17.0 19.6 20.8 21.8 L-111 B 18.1 +/- 3.0 15.8 18.8 18.8 19.0 L-112 19.7 +/- 2.8 18.1 20.3 19.2 21.4 L-113A 18.9 +/- 3.3 16.6 20.3 19.9 18.8 L-114 18.1 +/- 2.5 17.2 17.9 17.4 19.9 L-115 17.2 +/- 2.4 16.2 16.3 17.3 18.9 L-116 16.7 +/- 2.4 15.2 16.2 17.7 17.6 L-201 14.5 +/- 1.6 13.5 14.9 14.3 15.3 L-202 16.3 +/- 2.1 15.2 17.3 15.5 17.1 L-203 18.5 +/- 1.9 17.8 17.6 19.0 19.5 L-204 19.5 +/- 3.0 18.1 19.3 18.9 21.6 L-205A 18.6 +/- 3.0 16.4 19.0 19.1 19.9 L-2058 18.6 +/- 3.0 16.4 19.0 19.1 19.9 L-206 18.2 +/- 2.0 17.0 18.1 18.2 19.5 L-207 17.9 +/- 2.4 16.9 17.8 17.5 19.6 L-208 19.0 +/- 2.9 17.1 19.5 19.1 20.6 L-209 18.2 +/- 3.2 16.4 (1) 18.9 19.4 L-210 19.6 +/- 2.2 18.2 19.6 20.0 20.9 L-211 19.0 +/- 2.4 17.4 18.7 19.9 19.9 L-212 19.2 +/- 3.0 (1) 17.7 19.3 20.7 L-213 18.0 +/- 2.4 16.5 17.8 18.6 19.3 L-214 18.3 +/- 2.4 16.8 17.9 19.4 19.2 L-215 19.4 +/- 2.1 18.2 19.9 19.1 20.6 L-216 18.5 +/- 2.9 17.5 17.7 18.2 20.7 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANA T/ON C-17

TABLE C-IX.2 MEAN QUARTERLY OSLO RES UL TS FOR THE INNER RING, OUTER RING, OTHER AND CONTROL LOCATIONS FOR LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF MILLIREM/QUARTER +/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTION PERIOD JAN-MAR APR-JUN JUL-SEP OCT-DEC Table C-IX.3 LOCATION INNER RING OUTER RING OTHER CONTROL INNER RING OUTER RING OTHER CONTROL

+/- 2 S.D.

16.9 +/- 2.4 16.8 +/- 2.3 16.6 +/- 1.2 14.1 +/- 0 18.3 +/- 2.2 18.3 +/- 2.2 17.8 +/- 1.5 15.7 +/- 0 18.5 +/- 2.1 18.5 +/- 2.1 18.6 +/- 1.3 15.1 +/- 0 19.9 +/- 2.1 19.9 +/- 2.1 19.3 +/- 2.2 15.4 +/- 0

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF MILLI REM/QUARTER SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM

+/-2 S.D.

67 14.4 21.8 18.4 +/- 3.1 66 13.5 21.6 18.3 +/- 3.3 28 15.6 20.2 18.1 +/- 2.5 4

14.1 16.8 15.4 +/- 2.2 INNER RING STATIONS -L-101-1, L-101-2, L-102-1, L-102-2, L-103-1, L-103-2, L-104-1, L-104-2, L-105-1, L-105-2, L-106-1, L-106-2, L-107-1, L-107-2, L-108-1, L-108-2, L109-1, L109-2, L110-1, L110-2, L-111B-1, L-1118-2, L-112-1, L-112-2, L113A-1, L-113A-2, L114-1, 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, L205-1, L-205-2, L-205-3, L-205-4, L-206-1, L-206-2, L-207-1, L207-2, L208-1, L208-2, L209-1, L209-2, L210-1, 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-2016-3, 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-11A-1, L-11A-2 CONTROL STATIONS - L-10-1, L-10-2 C-18

FIGURE C-3 Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2005 - 2021 60.0 50.0 M

40.0

.§ 0 c. 30.0 M

9

~ 20.0 10.0 L-01 Nearsite No. 1 0.0....... _________

____,j 01-06-05 60.0 50.0 M

40.0

.§ c3 c.

30.0 M

q

~

20.0 10.0 04-06-09 07-05-13 10-03-17 01-01-22 L-03 Onsite No. 3 0.0 +---------------------

01-06-05 04-06-09 07-05-13 10-03-17 01-01-22 C-19

FIGURE C-4 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2005 - 2021 60.0 50.0 e 4o.o

[>

c. 30.0

'i'

~ 20.0 10.0 L-05 Onsite No. 5 0.0 +------------+-----L....------1 01-06-05 70.0 60.0 50.0

-E u 40,0 C. 9 30,0 w

~ 20.0 10.0 04-06-09 07-05-13 10-03-17 01-01-22 L-06 Nearsite No. 6 0.0 +----------------i---------1 01-06-05 04-06-09 07-05-13 10-03-17 01-01-22 C-20

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

Collected in the Vicinity of LSCS, 2005 - 2021 60.0 50.0

§ 40.0 u

c. 30.0 M

9

~ 20.0 10.0 L-10 (C) Streator 0.0 +----+-----1-------+----~

01-06-05 04-06-09 07-05-13 10-03-17 01-01-22 C-21

FIGURE C-6 Air Particulate - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LSCS, 2005 - 2021 60.0 50.0 M

40.0

.E 0 c. 30.0 M

c;,

~ 20.0 10.0 L-04 Rte. 170 0.0 +------+----------------1 07-07-05 60.0 50.0 M

40.0

.E 0 c. 30.0 M

0

~ 20.0 10.0 08-21-09 10-05-13 11-19-17 01-03-22 L-07 Seneca 0.0 +------+----

--+----- --1----~

07-07-05 08-21-09 10-05-13 11-19-17 01-03-22 C-22

FIGURE C-7 Air Particulate - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LSCS, 2005 - 2021 60.0 50.0 M

40.0

-E 0 c. 30.0 M

9

~ 20.0 10.0 L-08 Marseilles 0.0 ------------------+-----

07-07-05 60.0 50.0 M

40.0

-E 0 c. 30.0 M

9

~ 20.0 10.0 08-21-09 10-05-13 11-19-17 01-03-22 L-11 Ransom (1) 0.0 ---------------------

07-07-05 01-14-09 07-24-12 02-01-16 (1) Air monitoring station L-11 was retired on 01121/16 C-23

FIGURE C-8 Air Particulate - Gross Beta - Station L-11A Collected in the Vicinity of LSCS, 2016 - 2021 M

-E 0

40.0 30.0

c. 20.0 M

9 w

0

~ 10.0 L-11A Ransom (1) 0.0 +--------+-------+---------!

01-07-16 01-05-18 01-04-20 01-02-22 (1) Air monitoring station L-11A was placed in service on 01/14/16 C-24

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledxne Brown Engineering Environmental Services Identification TSE Known Ratio of TSE to Month/Year Number Matrix Nuclide Units Reported Value<*>

Analytics Result Evaluation (b>

Value March 2021 E13466 Milk Sr-89 pCi/L 84.6 87.1 0.97 A

Sr-90 pCi/L 11.5 12.6 0.91 A

E13467 Milk Ce-141 pCi/L 111 125 0.89 A

Co-58 pCi/L 123 128 0.96 A

Co-60 pCi/L 140 154 0.91 A

Cr-51 pCi/L 252 242 1.04 A

Cs-134 pCi/L 130 151 0.86 A

Cs-137 pCi/L 110 110 1.00 A

Fe-59 pCi/L 105 109 0.96 A

1-131 pCi/L 77.6 86.9 0.89 A

Mn-54 pCi/L 111 112 0.99 A

Zn-65 pCi/L 200 211 0.95 A

E13468 Charcoal 1-131 pCi 83.5 88.5 0.94 A

E13469 AP Ce-141 pCi 103.0 103 1.00 A

Co-58 pCi 93.3 105 0.89 A

Co-60 pCi 136 126 1.08 A

Cr-51 pCi 213 198 1.07 A

Cs-134 pCi 123.0 124 0.99 A

Cs-137 pCi 86.3 90.1 0.96 A

Fe-59 pCi 81.3 89.6 0.91 A

Mn-54 pCi 93.5 92.0 1.02 A

Zn-65 pCi 166 173 0.96 A

E13470 Soil Ce-141 pCi/g 0.232 0.262 0.89 A

Co-58 pCi/g 0.251 0.268 0.94 A

Co-60 pCi/g 0.306 0.322 0.95 A

Cr-51 pCi/g 0.517 0.506 1.02 A

Cs-134 pCi/g 0.263 0.317 0.83 A

Cs-137 pCi/g 0.278 0.301 0.92 A

Fe-59 pCi/g 0.228 0.229 1.00 A

Mn-54 pCi/g 0.221 0.235 0.94 A

Zn-65 pCi/g 0.448 0.441 1.02 A

E13471 AP Sr-89 pCi 92.2 95.5 0.97 A

Sr-90 pCi 11.7 13.9 0.84 A

(a) 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 (b) 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 (Page 1 of 2)

D-1

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teled:i:ne Brown Engineering Environmental Services Identification TBE Known Ratio of TBE to Month/Year Number Matrix Nuclide Units Reported Value 1*>

Analytics Result Evaluation <bl Value September 2021 E13472 Milk Sr-89 pCi/L 66.4 85.4 0.78 w

Sr-90 pCi/L 11.9 14.0 0.85 A

E13473 Milk Ce-141 pCi/L 118 114 1.03 A

Co-58 pCi/L 116 118 0.98 A

Co-60 pCi/L 142 145 0.98 A

Cr-51 pCi/L 244 236 1.03 A

Cs-134 pCi/L 81 93.1 0.87 A

Cs-137 pCi/L 105 112 0.94 A

Fe-59 pCi/L 105 102 1.03 A

1-131 pCi/L 65.1 85.6 0.76 w

Mn-54 pCi/L 128 128 1.00 A

Zn-65 pCi/L 158 153 1.03 A

E13474 Charcoal 1-131 pCi 85.2 90.9 0.94 A

E13475 AP Ce-141 pCi 126 135 0.94 A

Co-58 pCi 148 139 1.07 A

Co-60 pCi 183 171 1.07 A

Cr-51 pCi 322 278 1.16 A

Cs-134 pCi 118 110 1.08 A

Cs-137 pCi 147 132 1.12 A

Fe-59 pCi 131 120 1.09 A

Mn-54 pCi 161 151 1.06 A

Zn-65 pCi 202 180 1.12 A

E13476 Soil Ce-141 pCi/g 0.215 0.219 0.98 A

Co-58 pCi/g 0.208 0.226 0.92 A

Co-60 pCi/g 0.277 0.277 1.00 A

Cr-51 pCi/g 0.388 0.452 0.86 A

Cs-134 pCi/g 0.157 0.178 0.88 A

Cs-137 pCi/g 0.270 0,284 0.95 A

Fe-59 pCi/g 0.218 0,195 1.12 A

Mn-54 pCi/g 0.239 0.246 0,97 A

Zn-65 pCi/g 0.312 0.293 1.06 A

E13477 AP Sr-89 pCi 85.6 68.3 1.25 w

Sr-90 pCi 12.6 11.2 1.13 A

(a) 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 (b) 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 (Page 2 of 2) 0-2

Table D.2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teled~ne Brown Engineering Environmental Services Identification TBE Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (b l Number Value Value (a)

Range February 2021 21-GrF44 AP Gross Alpha Sq/sample 0.371 1.77 0.53 - 3.01 N<J>

Gross Beta Sq/sample 0.731 0.65 0.325 - 0.974 A

21-MaS44 Soil Ni-63 Bq/kg 310 689.0 482 - 896 N'"I Tc-99 Bq/kg 457 638 447 - 829 w

21-MaSU44 Urine Cs-134 Bq/L 2.34 2.73 1.91 - 3.55 A

Cs-137 Bq/L 2.54 2.71 1.90 - 3.52 A

Co-57 Bq/L 0.4100 (1)

A Co-60 Bq/L 2.24 2.44 1.71-3.17 A

Mn-54 Bq/L 2.03 2.03 1.42 - 2.64 A

K-40 Bq/L 52.8 54.0 38-70 A

U-234 Bq/L 0.108 0.0877 0.0614-0.114 w

U-238 Bq/L 0.101 0.091 0.064 - 0.118 A

Zn-65 Bq/L 1.06 1.34 (2)

A 21-MaW44 Water Ni-63 Bq/L 6.7 8.2 5.7 - 10.7 A

Tc-99 Bq/L 3.850 4.01 2.81 - 5.21 A

21-RdV44 Vegetation Cs-134 Sq/sample 3.13 3.60 2.5 - 4.7 A

Cs-137 Sq/sample 4.64 4.69 3.28 - 6.10 A

Co-57 Sq/sample 5.25 5.05 3.54 - 6.57 A

Co-60 Sq/sample 2.86 2.99 2.09 - 3.89 A

Mn-54 Sq/sample 5.02 5.25 3.68 - 6.83 A

Sr-90 Sq/sample 0.631 0.673 0.471 - 0.875 A

Zn-65 Sq/sample

-0.233 (1)

A August 2021 21-GrF45 AP Gross Alpha Sq/sample 0.368 0.960 0.288 - 1.632 A

Gross Beta Sq/sample 0.595 0.553 0.277 - 0.830 A

21-MaS45 Soil Ni-63 Bq/kg 546 1280 896 - 1664 NI~/

Tc-99 Bq/kg 453 777 544 - 1010 N101 21-MaSU45 Urine Cs-134 Bq/L 3.10 3.62 2.53 - 4.71 A

Cs-137 Bq/L 0.083 (1)

A Co-57 Bq/L 0.844 0.87 0.606-1.125 A

Co-60 Bq/L 0.0535 (1)

A Mn-54 Bq/L 0.459 0.417 (2)

A K-40 Bq/L 48.8 54.0 38-70 A

U-234 Bq/L 0.133 0.116 0.081-0.151 A

U-238 Bq/L 0.137 0.121 0.085 - 0.157 A

Zn-65 Bq/L 0.339 0.420 (2)

A 21-MaW45 Water Ni-63 Bq/L 33.5 39.5 27.7-51.4 A

Tc-99 Bq/L 3.5 3.7 2.60 - 4.82 A

21-RdV45 Vegetation Cs-134 Sq/sample 3.42 4.34 3.04 - 5.64 w

Cs-137 Sq/sample 2.14 2.21 1.55 - 2.87 A

Co-57 Sq/sample 4.08 4.66 3.26 - 6.06 A

Co-60 Sq/sample 2.81 3.51 2.46 - 4.56 A

Mn-54 Sq/sample 0.035 (1)

A Sr-90 Sq/sample 1.15 1.320 0.92 - 1.72 A

Zn-65 Sq/sample 2.05 2.43 1.70-3.16 A

(a) 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 (b) DOEIMAPEP evaluation:

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 (1) False positive test (2) Sensitivity evaluation (3) See NCR 21-02 (4) See NCR 21-03 (5) See NCR 21-13 (6) Tc-99 cross-checks done for TBE information only - not required D-3 (Page 1 of 1)

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services Identification TSE Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value Value (a)

Limits March 2021 MRAD-34 Water Am-241 pCi/L 175 157 108 - 201 A

Fe-55 pCi/L 579 275 162 - 400 NI

Pu-238 pCi/L 181 171 103 - 222 A

Pu-239 pCi/L 153 142 87.9-175 A

Soil Sr-90 pCi/kg 6570 9190 2860 - 14,300 A

AP Fe-55 pCi/filter 107 121 44.2 - 193 A

U-234 pCi/filter 25.99 25.5 18.9 - 29.9 A

U-238 pCi/filter 24.7 25.3 19.1 - 30.2 A

April 2021 RAD-125 Water Ba-133 pCi/L 92.3 90.5 76.2 - 99.6 A

Cs-134 pCi/L 62.9 70.5 57.5 - 77.6 A

Cs-137 pCi/L 161 168 151 - 187 A

Co-60 pCi/L 22.5 20.9 17.7-25.8 A

Zn-65 pCi/L 183 177.0 159 - 208 A

GR-A pCi/L 30.8 30.2 15.4 - 39.4 A

GR-B pCi/L 60.1 67.5 46.8 - 74.2 A

U-Nat pCi/L 36.45 36.9 30.0 - 40.8 A

H-3 pCi/L 13,400 14,600 12,800-16,100 A

Sr-89 pCi/L 64.5 63.5 51.4-71.5 A

Sr-90 pCi/L 22.8 23.0 16.5 - 27.0 A

1-131 pCi/L 28.2 26.7 22.2 - 31.4 A

September 2021 MRAD-35 Water Am-241 pCi/L 68 63.7 43.7-81.5 A

Fe-55 pCi/L 179 246 145 - 358 A

Pu-238 pCi/L 102 114 68 5 - 148 A

Pu-239 pCi/L 32 34.3 21.2 - 42.3 A

Soil Sr-90 pCi/kg 6160 6090 1,900 - 9,490 A

AP Fe-55 pCi/filter 493 548 200 - 874 A

Pu-238 pCi/filter 28 28.5 21.5 - 35.0 A

Pu-239 pCi/filter 21 21.6 16.1 - 26.1 A

U-234 pCi/filter 7.95 7.76 5.75 - 9.09 A

U-238 pCi/filter 8.0 7.69 5.81 - 9.17 A

October 2021 RAD-127 Water Ba-133 pCi/L 82.8 87.5 73.6 - 96.2 A

Cs-134 pCi/L 64.0 70.1 57.1-77.1 A

Cs-137 pCi/L 145 156 140 - 174 A

Co-60 pCi/L 83.2 85.9 77.3 - 96.8 A

Zn-65 pCi/L 133 145 130- 171 A

GR-A pCi/L 76.0 66.7 35.0 - 82.5 A

GR-B pCi/L 63.0 55.7 38.1 - 62.6 N\\LJ U-Nat pCi/L 52.88 55.5 45.3-61.1 A

H-3 pCi/L 13,800 17,200 15,000 - 18,900 Nt"I Sr-89 pCi/L 54.9 61.0 49.1 - 68.9 A

Sr-90 pCi/L 24.8 29.3 21.3 - 34.0 A

1-131 pCi/L 27.4 26.4 21.9-31.1 A

December 2021 QR 120121Y Water GR-B pCi/L 47.6 39.8 26.4 - 47.3 Nt*I H-3 pCi/L 17,500 17,800 15,600 - 19,600 A

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

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 21-01 (2) See NCR 21-10 (3) See NCR 21-11 (4) See NCR 21-14 0-4 (Page 1 of 1)

APPENDIX E EFFLUENT DATA

Intentionally left blank

TABLE OF CONTENTS Introduction............................................................................................................... 1 Summary.................................................................................................................. 2 1.0. Effluents.................................................................................................... 3 1.1. Gaseous Effluents to the Atmosphere.............................................. 3 1.2. Liquids Released to Illinois River...................................................... 3 2.0. Solid Radioactive Waste........................................................................... 3 3.0. Dose To Man............................................................................................. 3 3.1. Gaseous Effluent Pathways.............................................................. 3 3.1.1. Noble Gases.......................................................................... 3 3.1.1.1. Gamma Dose Rates................................................ 3 3.1.1.2. Beta Air and Skin Dose Rates................................. 4 3.1.2. Radioactive Iodine................................................................. 4 3.1.2.1. Dose to Thyroid....................................................... 4 3.2. Liquid Effluent Pathways................................................................... 5 3.3. Assessment of Dose to Member of Public........................................ 5 4.0. Site Meteorology....................................................................................... 5 Appendix E-1 Data Tables and Figures...................................................... E-1.1 Station Releases Table 1.1-1 Gaseous Effluents Summation of all Releases................ E-1.2 Table 1.2-1 Summation of all Liquid Releases................................... E-1.3 Table 3.1-1 Maximum Doses Resulting from Gaseous Releases and Compliance Status.............................................. E-1.4 Table 3.2-1 Maximum Doses Resulting from Liquid Releases and Compliance Status.............................................. E-1.5 Table 3.3-1 Maximum Doses Resulting from Releases and Compliance Status.............................................. E-1.6 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data............... E-1. 7

Introduction LaSalle County Station, a two-unit BWR, is located near Marseilles, Illinois in LaSalle County, 3.5 miles south of the Illinois River. Both units are rated at 3546 MWt. Unit 1 loaded fuel in March 1982. Unit 2 loaded fuel in late December 1983. The Station is designed to keep releases to the environment at levels below those specified in the regulations.

Liquid effluents, although no longer batch 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 allowing time for short-lived (noble) gases to decay. Releases to the atmosphere are sampled and analyzed on a routine basis. The gaseous effluent samples are analyzed for particulate, iodine, noble gas, and tritium activity. The particulate and iodine sample results are obtained from continuously collected composite samples. The noble gas and tritium sample results are obtained from routine grab samples. The results of effluent analyses are summarized on a monthly basis and reported to the Nuclear Regulatory Commission as required per Technical Specifications. Airborne concentrations of noble gases, tritium, 1-131, and particulate radioactivity in offsite areas are calculated using effluent and meteorological data.

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

E-1

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 batch 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 released to the atmosphere represented the critical pathway for the period with a maximum individual total dose estimated to be 3.98E-05 mrem for the year, where a shielding factor of 0.7 and an occupancy factor of 0.95 are assumed for the nearest resident. The assessment of radiation doses is performed in accordance with the Offsite Dose Calculation Manual (ODCM), specifically, a comparison of preoperational studies with operational controls or with previous environmental surveillance reports and an assessment of the observed impacts of the plant operation on the environment. Control locations are basis for "preoperational data." The results of analysis confirm that the station is operating in compliance with 10 CFR 50 Appendix I, 10 CFR 20 and 40 CFR 190.

E-2

1.0 Effluents 1.1 Gaseous Effluents to the Atmosphere Measured concentrations of noble gases, radioiodine, and particulate radioactivity released to the atmosphere during the year, are listed in Table 1.1-1. A total of 3.85E+01 curies of fission and activation gases were released with an average release rate of 1.22E+00 µCi/sec.

A total of 7.28E-03 curies of 1-131 were released during the year with an average release rate of 2.31 E-04 µCi/sec.

A total of 1.02E-04 curies of beta-gamma emitters were released as airborne particulate matter with an average release rate of 3.23E-06 µCi/sec.

A total of 9.98E+01 curies of tritium were released with an average release rate of 3.16E+O0 µCi/sec.

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

A total of 3.13E+01 curies of carbon-14 were released with an average release rate of 9.93E-01 µCi/sec.

1.2 Liquids Released to Illinois River There were no liquid batch releases in 2021. Continuous release path activity was below applicable Lower Limits of Detection.

2.0 Solid Radioactive Waste Solid radioactive wastes were shipped by truck to a disposal facility or to a waste processor. For further detail, refer the LaSalle 2021 Annual Radioactive Effluent Release Report (ARERR). This report was submitted to the USNRC by the required date of May 1st, 2022.

3.0 Dose To Man 3.1 Gaseous Effluent Pathways Table 3.1-1 summarizes the doses resulting from releases of airborne radioactivity via the different exposure pathways.

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

measured effluents and meteorological data, the maximum total body dose to an individual would be 3.98E-05 mrem (Table 3.1-1) for the year, with an occupancy factor of 0.95 and a shielding factor of 0.7 included. The maximum total body dose based on measured effluents and concurrent meteorological data would be 1.27E-02 mrem (Table 3.4-1 ).

The maximum gamma air dose was 5.94E-05 mrad from Table 3.1-1, and the maximum gamma air dose from concurrent meteorological data was 7.48E-05 mrad (Table 3.4-1 ).

3.1.1.2 Beta Air and Skin Dose 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 7.49E-05 mrem from Table 3.1-1, and the skin dose from concurrent meteorological data was 1.45E-04 mrem (Table 3.4-1 ).

The maximum offsite beta dose for the year was 1.84E-05 mrad from Table 3.1-1, and the maximum offsite beta dose from concurrent meteorological data was 1.21 E-04 mrad (Table 3.4-1 ).

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

3.1.2.1 Dose to Thyroid The hypothetical thyroid dose to a maximum exposed individual living near the station via ingestion of milk was calculated. The radionuclide considered was 1-131 and the source of milk was taken to be the.nearest dairy farm with the cows pastured from May through October. The maximum thyroid dose due to 1-131 was 4.07E-02 mrem for the year.

E-4

3.2 Liquid Effluent Pathways The three principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water, eating aquatic foods, and exposure while on the shoreline. Not all of these pathways are significant or applicable at a given time but a reasonable approximation of the dose can be made by adjusting the dose formula for season of the year or type and degree of use of the aquatic environment. NRC developed equations* were used to calculate the doses to the whole body, lower gastro-intestinal tracts, thyroid, bone and skin; specific parameters for use in the equations are given in the Offsite Dose Calculation Manual. The maximum whole body dose was 0.00E+00 mrem and organ dose was 0.00E+00 for the year mrem (Table 3.2-1 ).

3.3 Assessment of Dose to Member of Public During the period January to December 2021, 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 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 mrad 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 10 CFR 20 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 99.4% during 2021.

Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1)

E-5

APPENDIX E-1 DATA TABLES AND FIGURES E-1-1

Intentionally left blank

Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

UNIT 1 AND UNIT 2 DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES A. Fission & Activation Gases Unit Quarter Quarter Quarter Quarter 1

2 3

4

1. Total Release Ci 1.97E+01 8.81E+00 7.90E+00 2.10E+00

2. Average release rate for the period

~1Ci/sec 2.50E+00 1.12E+00 1.00E+00 2.66E-01

3. Percent of ODCM limit B. Radioiodines

1. Total Iodine -131 Ci 2.38E-03 1.60E-03 1.32E-03 1.98E-03

2. Average release rate for the period

~1Ci/sec 3.02E-04 2.03E-04 1.67E-04 2.51E-04

3. Percent of ODCM limit C. Particulates

1. Particulates with half-lives > 8 days Ci 5.76E-05 4.40E-05 3.69E-08 1.0?E-07

2. Average release rate for the period

µCi/sec 7.41 E-06 5.59E-06 4.64E-09 1.35E-08

3. Percent of ODCM limit D. Tritium

1. Total Release Ci 3.85E+01 2.34E+01 2.16E+01 1.63E+01

2. Average release rate for the period

~1Ci/sec 4.88E+00 2.97E+00 2.74E+00 2.07E+00

3. Percent of ODCM limit E. Gross Alpha

1. Total Release Ci

<LLD

2. Average release rate for the period

~1Ci/sec

<LLD

3. Percent of ODCM limit F. Carbon-14

1. Total Release Ci 7.83E+00 7.83E+00 7.83E+00 7.83E+00

2. Average release rate for the period

~1Ci/sec 1.01E+00 9.95E-01 9.85E-01 9.85E-01

3. Percent of ODCM limit

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

"<" Indicates activity of sample is less than LLD given in µCi/ml Total Est. Total Error%

3.85E+01 2.50E+01 1.22E+00 7.28E-03 1.50E+01 2.31E-04 1.02E-04 3.50E+01 3.23E-06 9.98E+01 1.50E+01 3.16E+00

<LLD N/A

<LLD 3.13E+01 N/A 9.93E-01 The LaSalle County Nuclear Power Station maximum expected annual dose from Carbon-14 has been calculated using the maximum gross thermal capacity at full power operation. The resultant bounding dose~ are based upon site specific assumptions of source term.

E-1-2

Table 1.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

LIQUID RELEASES UNIT 1 AND UNIT 2 SUMMATION OF ALL LIQUID RELEASES A. Fission & Activation Products Unit Quarter Quarter Quarter 1

2 3

1. Total Release (not including tritium, gases & alpha)

Ci

<LLD

2. Average diluted concentration during period

~tCi/mL

<LLD

3. Percent of applicable limit B. Tritium

1. Total Release Ci

<LLD

2. Average diluted concentration during period

~tCi/mL

<LLD

3. Percent of applicable limit C. Dissolved & Entrained Gases

1. Total Release Ci

<LLD

2. Average diluted concentration during period

~tCi/mL

<LLD

3. Percent of applicable limit D. Gross Alpha Activity

1. Total Release Ci

<LLD

2. Average release rate for the period

~tCi/mL

<LLD

3. Percent of ODCM limit Quarter 4

<LLD

<LLD.

<LLD

<LLD.

<LLD

<LLD E. Volume of Waste Released (prior to dilution)

Liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 F. Volume of Dilution Water Used During Period Liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00

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

"<" Indicates activity of sample is less than LLD given in µCi/ml E-1-3 Est. Total Error%

N/A N/A N/A NIA

m I

~

I

.i:.

Table 3.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM GASEOUS RELEASES AND COMPLIANCE STATUS Adult Quarterly Units 1st

%of 2nd

%of 3rd

%of 4th

%of Annual Annual

%of Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.0BE-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11 E-06 1.11E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.0BE-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 3.14E-03 4.19E-02 3.13E-03 4.17E-02 3.13E-03 4.17E-02 3.13E-03 4.17E-02 1.50E+01 1.25E-02 1.25E-01 Teenager Quarterly Units 1st

%of 2nd

%of 3rd

%of 4th

%of Annual Annual

%of Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.0BE-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11 E-06 1.11 E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.0BE-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 4.73E-03 6.31E-02 4.73E-03 6.31E-02 4.72E-03 6.29E-02 4.72E-03 6.29E-02 1.50E+01 1.89E-02 1.89E-01 Child Quarterly Units 1st

%of 2nd

%of 3n1

%of 4th

% of Annual Annual

%of Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.0BE-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11 E-06 1.11 E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.0BE-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 1.11E-02 1.48E-01 1.11 E-02 1.48E-01 1.11 E-02 1.48E-01 1.11 E-02 1.48E-01 1.50E+01 4.44E-02 4.44E-01 Infant Quarterly Units 1st

%of 2nd

%of 3n1

%of 4th

% of Annual Annual

% of Receptor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+00 mRad 1.30E-05 2.60E-04 2.17E-05 4.34E-04 2.07E-05 4.14E-04 4.0BE-06 8.16E-05 1.00E+01 5.94E-05 5.94E-04 Beta Air 1.00E+01 mRad 8.34E-06 8.34E-05 4.73E-06 4.73E-05 4.26E-06 4.26E-05 1.11 E-06 1.11 E-05 2.00E+01 1.84E-05 1.84E-04 NG Total Body 2.50E+00 mRem 8.62E-06 3.45E-04 1.46E-05 5.84E-04 1.39E-05 5.56E-04 2.75E-06 1.10E-04 5.00E+00 3.98E-05 3.98E-04 NG Skin 7.50E+00 mRem 1.84E-05 2.45E-04 2.64E-05 3.52E-04 2.50E-05 3.33E-04 5.0BE-06 6.77E-05 1.50E+01 7.49E-05 7.49E-04 NNG Organ 7.50E+00 mRem 1.28E-02 1.71E-01 9.11E-03 1.21 E-01 7.80E-03 1.04E-01 1.10E-02 1.47E-01 1.50E+01 4.0?E-02 4.0?E-01 The LaSalle County Nuclear Power Station maximum expected annual dose from Carbon-14 has been calculated using the maximum gross thermal capacity at full power operation. The resultant bounding doses are based upon site specific assumptions of source term.

Table 3.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM LIQUID RELEASES AND COMPLIANCE STATUS Infant Quarterly 1st

%of 2nd

%of 3rd

%of 4th

%of Annual

%of Receetor Limit Units Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Child Quarterly 1st

%of 2nd

%of 3rd

%of 4th

%of Annual

%of Receetor Limit Units Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 1.00E+01 0.00 m 40CFR141 compliance (nearest public drinking water)

I....

Total Body mRem 0.00E+O0 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 I 0, Organ mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Teenager Quarterly 1st

%of 2nd

%of 3rd

%of 4th

%of Annual

%of Receetor Limit Units Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.00E+00 0.00 Organ mRem 0.00E+00 0.00E+0O 0.00E+00 O.00E+00 4.00E+00 0.00 Adult Quarterly 1st

%of 2nd

%of 3rd

%of 4th

% of Annual

% of Receetor Limit Units Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 3.00E+00 0.00 Organ 5.00E+00 mRem 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 0.00E+00 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

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

Table 3.3-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM LIQUID RELEASES AND COMPLIANCE STATUS Unit 1 1st Quarter Dose (mRem) 10CFR20 / 40CFR190 Compliance 2nd Quarter Dose (mRem) 3rd Quarter Dose (mRem) 4th Quarter Dose (mRem)

Annual Dose (mRem)

Annual Limit (mRem/yr)

Annual Limit 40CFR190 Compliance U1 QEX I 9.65E-02 I 9.62E-02 I 7.18E-02 I 9.82E-02 I I 3.63E-01 I 25 1.45 U1 QTot 1.11 E-01 1.07E-01 I 8.29E-02 I 1.10E-01 Bone Liver Thyroid Kidney Lung GI-LU Skin Unit 2 1.11E-02 2.26E-03 1.28E-02 2.27E-03 2.24E-03 2.24E-03 3.26E-05 1.11 E-02 2.24E-03 9.11E-03 2.25E-03 2.23E-03 2.24E-03 2.50E-05 1.11 E-02 1.11 E-02 2.25E-03 2.25E-03 7.80E-03 1.10E-02 2.25E-03 2.26E-03 2.24E-03 2.24E~03 2.24E-03 2.24E-03 1.15E-06 1.50E-06 1 0CFR20 Compliance I~ 4-.1-1 E---

01~1 100 0.41 4.44E-02 9.00E-03 4.07E-02 9.03E-03 8.95E-03 8.96E-03 6.02E-05 40CFR190 Compliance 25 25 75 25 25 25 25 0.18 0.04 0.05 0.04 0.04 0.04 0.00 40CFR190 Compliance U2 DEX I 5.48E-02 I 7.72E-02 I 7.23E-02 I 9.84E-02 I I 3.03E-01 25 1.21 U2 QTot I 5.48E-02 I 7.72E-02 I 7.23E-02 I 9.84E-02 Bone Liver Thyroid Kidney Lung GI-LLI Skin 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 O.00E+00 E-1-6 I 3.03E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1 0CFR20 Compliance 100 0.30 40CFR190 Compliance 25 25 75 25 25 25 25 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Table 3.4-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2021)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES BASED ON CONCURRENT METEROLOGICAL DATA Doses Resulting From Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from LaSalle County Station airborne releases:

LaSalle County Generating Station:

Dose gamma air (1>

beta air(2>

whole body (3>

skin (4>

organ (5> (infant-thyroid)

Maximum Value 7.480 E-05 mrad 1.210 E-04 mrad 1.270 E-02 mrem 1.450 E-04 mrem 1.550 E-01 mrem Compliance Status 10 CFR 50 Appendix I Yearly Objective gamma air 10.0 mrad beta air 20.0 mrad whole body 5.0 mrem skin 15.0 mrem organ 15.0 mrem (1l Gamma Air Dose - GASPAR II, NUREG-0597 (2l Beta Air Dose - GASPAR 11, NUREG-0597 (3l Whole Body Dose - GASPAR II, NUREG-0597 (4>

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

Inhalation and Food Pathways Dose - GASPAR II, NUREG-0597 E-1-7 Sector Affected Northeast Northeast Northeast Northeast North-Northeast

% of Appendix I 0.00 0.00 0.25 0.00 1.03

APPENDIX F METEOROLOGICAL DATA

Intentionally left blank

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class -

Extremely Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 2

0 0

0 2

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

3 3

2 8

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

0 1

w 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 2

3 4

2 11 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-1

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

1 0

0 1

E 0

0 0

ESE 0

0 0

SE 0

0 1

0 0

0 1

SSE 0

0 0

s 0

0 1

3 3

0 7

SSW 0

0 0

3 0

1 4

SW 0

0 0

0 1

2 3

WSW 0

0 0

1 3

0 4

w 0

1 0

0 0

0 1

WNW 0

0 0

3 2

0 5

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

1 2

11 9

3 26 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-2

LaSalle County Generating Station Period of Record: January -

March 2021 Stability Class - Slightly Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed ( in mph)

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

> 24 Total N

0 0

0 NNE 0

1 0

0 0

0 1

NE 0

0 3

0 0

0 3

ENE 0

0 2

2 1

0 5

E 0

0 0

ESE 0

0 2

0 0

0 2

SE 0

0 3

0 0

0 3

SSE 0

0 3

4 0

0 7

s 0

1 2

5 1

2 11 SSW 0

0 3

5 0

1 9

SW 0

0 1

0 0

1 2

WSW 0

1 0

0 1

0 2

w 0

1 1

0 4

WNW 0

0 1

3 3

0 7

NW 0

0 0

3 0

1 4

NNW 0

0 1

0 0

0 1

Variable 0

0 0

Total 0

4 22 23 7

5 61 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-3

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Neutral -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

1 29 85 30 0

0 145 NNE 0

16 18 7

15 0

56 NE 1

6 33 29 7

1 77 ENE 0

6 15 3

13 2

39 E

5 11 16 9

2 4

47 ESE 0

8 8

3 8

0 27 SE 0

7 15 8

1 0

31 SSE 1

1 9

3 1

1 16 s

4 14 7

7 2

1 35 SSW 0

10 5

8 4

3 30 SW 1

10 9

7 7

0 34 WSW 0

10 23 17 3

0 53 w

0 12 53 15 18 2

100 WNW 3

11 57 30 21 3

125 NW 1

5 35 13 2

3 59 NNW 0

18 83 92 0

0 193 Variable 0

0 0

Total 17 17 4 471 28 1 1 0 4 20 1067 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-4

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Slightly Stable -

200Ft-33Ft Delta-T (F)

Winds Measu r ed at 33 Feet Wind Speed (in mph)

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

> 24 Total N

NNE NE ENE E

ESE SE SSE s

SSW SW WSW w

WNW NW NNW Variable Total 4

0 1

4 2

0 2

2 1

1 1

2 0

0 1

1 0

22 20 13 10 3

12 5

11 5

4 5

2 3

5 16 9

20 0

1 43 14 3

3 8

11 9

5 6

9 12 22 25 29 9

0 185 Hours of calm in this stability class :

0 1

1 3

1 0

9 10 10 9

12 21 13 18 22 4

0 0

134 0

0 0

0 1

3 8

9 16 7

5 0

12 6

0 0

0 67 0

0 0

0 1

2 3

5 0

0 8

1 0

0 0

21 Hours of missing wind measurements in this stability class :

4 39 17 17 16 27 26 43 37 38 36 38 30 65 70 43 30 0

57 2 Hours of missing stability measurements in all stability classes :

0 F-5

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet

\\rhnd Speed ( in mph)

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

> 24 Total N

0 3

0 0

3 NNE 0

0 0

NE 0

0 0

ENE 0

0 1

0 0

0 1

E 0

6 9

0 0

0 15 ESE 0

10 5

0 0

0 15 SE 1

10 8

1 0

0 20 SSE 1

5 4

4 0

0 14 s

2 5

7 4

0 0

18 SSW 0

5 9

10 0

0 24 SW 1

0 5

15 3

0 24 WSW 0

5 17 10 1

0 33 w

1 7

7 5

0 0

20 WNW 0

8 13 0

0 0

21 NW 1

2 9

0 0

0 12 NNW 1

1 0

0 0

0 2

Variable 0

0 0

Total 8

67 94 49 4

0 222 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-6

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Extremely Stable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

3 2

0 0

0 5

ESE 0

7 10 0

0 0

17 SE 1

12 28 0

0 0

41 SSE 0

5 15 4

0 0

24 s

0 6

12 8

0 0

26 SSW 1

2 17 8

2 0

30 SW 0

3 3

5 0

0 11 WSW 0

5 0

2 0

0 7

w 4

5 11 0

0 0

20 WNW 1

10 3

0 0

0 14 NW 0

0 0

NNW 1

0 0

0 1

Variable 0

0 0

Total 8

58 101 27 2

0 196 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-7

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class -

Extremely Unstable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

1 0

0 1

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

w 0

0 0

\\.I/NW 0

0 0

2 2

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

1 0

2 3

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-8

LaSalle County Generating Station Period of Record : January - March 2021 Stability Class - Moderately Unstable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed ( in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

3 3

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

w 0

0 0

WNW 0

0 0

4 4

NW 0

0 0

3 3

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

10 1 0 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 :

0 F-9

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Slightly Unstable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

1 0

0 1

ENE 0

0 0

1 0

0 1

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

1 3

2 6

SSW 0

0 0

SW 0

0 0

2 2

WSW 0

0 0

0 3

1 4

w 0

0 0

0 1

1 2

WNW 0

0 0

3 1

3 7

NW 0

0 0

1 0

2 3

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

7 8

1 1 26 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class ;

4 Hours of missing stability measurements in all stability classes :

0 F-10

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

5 6

25 51 25 5

117 NNE 4

7 24 22 0

17 74 NE 0

4 18 24 20 25 91 ENE 1

5 15 5

9 16 51 E

0 4

13 16 3

8 44 ESE 0

2 4

7 1

8 22 SE 0

5 3

12 6

6 32 SSE 2

1 11 10 1

4 29 s

1 0

5 13 10 12 41 SSW 0

4 1

16 9

10 40 SW 1

2 1

9 12 5

30 WSW 1

3 7

20 12 8

51 w

2 5

17 36 9

33 102 WNW 1

0 28 35 22 34 120 NW 0

6 31 41 18 8

104 NNW 2

5 25 51 32 1

116 Variable 0

0 0

Total 20 59 228 368 189 200 1064 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class :

136 Hours of missing stability measurements in all stability classes :

0 F-11

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Slightly Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Direction N

NNE NE ENE E

ESE SE SSE s

SSW SW WSW w

WNW NW NNW Variable Total 1-3 1

1 2

1 0

1 2

2 0

1 0

0 1

1 0

0 0

13 4-7 0

5 5

2 2

0 0

1 0

1 8

1 0

0 1

2 0

28 Wind Speed (in mph) 8-12 12 6

5 8

2 4

6 8

4 2

3 0

3 10 10 4

0 87 13-18 11 13 4

7 7

3 12 9

6 6

14 10 17 21 14 10 0

164 Hours of calm in this stability class :

0 19-24 4

8 2

0 2

4 9

6 8

11 3

9 12 19 4

4 0

105

> 24 0

1 0

0 1

2 17 14 33 16 28 14 15 15 3

0 0

159 Hours of missing wind measurements in this stability class :

47 Total 28 34 18 18 14 14 46 40 51 37 56 34 48 66 3.2 20 0

556 Hours of missing stability measurements in all stability classes :

0 F-12

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class - Moderately Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed ( in mph)

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

> 24 Total N

0 1

0 3

1 0

5 NNE 0

0 0

1 0

1 2

NE 0

1 0

0 0

0 1

ENE 0

1 0

0 0

0 1

E 0

1 2

1 0

0 4

ESE 0

1 0

4 1

0 6

SE 1

3 8

11 13 2

38 SSE 0

2 2

9 6

3 22 s

0 2

10 6

3 7

28 SSW 1

1 2

3 10 11 28 SW 0

2 2

2 5

8 19 WSW 0

1 3

3 2

14 23 w

0 3

2 2

1 6

14 WNW 0

1 1

10 4

0 16 NW 0

1 6

5 2

0 14 NNW 0

0 0

5 2

0 7

Variable 0

0 0

Total 2

21 38 65 50 52 228 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

11 Hours of missing stability measurements in all stability classes :

0 F-13

LaSalle County Generating Station Period of Record : January -

March 2021 Stability Class -

Extremely Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 37 5 Feet Wind Speed ( in mph)

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

> 24 Total N

1 0

0 0

1 NNE 0

0 0

NE 0

0 0

ENE 0

1 0

0 0

0 1

E 0

0 0

ESE 0

0 0

2 0

0 2

SE 0

0 0

5 9

1 15 SSE 0

0 0

1 12 2

15 s

1 1

0 4

8 6

20 SSW 0

0 0

0 4

4 8

SW 0

0 0

1 2

0 3

WSW 0

0 0

w 0

0 0

WNW 0

0 0

NW 0

0 1

0 0

0 1

NNW 0

0 0

1 0

0 1

Variable 0

0 0

Total 2

2 1

14 35 13 67 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 :

0 F-14

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class -

Extremely Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 2

11 1

0 0

14 NNE 0

5 2

1 0

0 8

NE 0

4 7

0 0

0 11 ENE 0

2 2

0 0

0 4

E 0

2 0

0 0

0 2

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

1 1

s 0

0 7

2 1

4 14 SSW 0

0 4

2 8

1 15 SW 0

1 2

4 4

2 13 WSW 0

2 6

6 1

0 15 w

0 0

8 0

1 0

9 WNW 0

3 3

1 0

0 7

NW 0

2 4

0 0

0 6

NNW 0

2 6

0 0

0 8

Variable 0

0 0

Total 0

25 62 17 15 8

127 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-15

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

4 4

0 0

8 NNE 0

4 2

0 0

0 6

NE 0

6 2

1 0

0 9

ENE 0

4 1

0 0

0 5

E 0

1 0

0 0

0 1

ESE 0

2 0

0 0

0 2

SE 0

1 0

0 0

0 1

SSE 0

3 1

0 0

0 4

s 1

4 1

6 3

0 15 SSW 0

1 3

3 3

1 11 SW 0

3 6

8 5

1 23 WSW 0

3 2

2 0

0 7

w 0

1 3

3 3

0 10 WNW 0

1 2

2 0

0 5

NW 0

9 2

0 0

0 11 NNW 0

3 1

1 0

0 5

Variable 0

0 0

Total 1

46 30 30 14 2

123 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-16

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 5

4 6

0 0

15 NNE 0

1 1

0 0

0 2

NE 0

7 3

1 0

0 11 ENE 0

6 4

0 0

0 10 E

2 1

1 0

0 0

4 ESE 0

1 0

0 0

0 1

SE 2

2 1

0 0

0 5

SSE 1

3 3

0 1

0 8

s 0

3 6

4 0

0 13 SSW 0

9 4

8 0

1 22 SW 0

4 11 3

3 1

22 WSW 0

2 5

1 1

1 10 w

0 5

1 7

2 0

15 WNW 0

8 4

11 0

0 23 NW 0

5 2

1 0

0 8

NNW 0

1 1

6 0

0 8

Variable 0

0 0

Total 5

63 51 48 7

3 177 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-17

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 5

4 6

0 0

15 NNE 0

1 1

0 0

0 2

NE 0

7 3

1 0

0 11 ENE 0

6 4

0 0

0 10 E

2 1

1 0

0 0

4 ESE 0

1 0

0 0

0 1

SE 2

2 1

0 0

0 5

SSE 1

3 3

0 1

0 8

s 0

3 6

4 0

0 13 SSW 0

9 4

8 0

1 22 SW 0

4 11 3

3 1

22 WSW 0

2 5

1 1

1 10 w

0 5

1 7

2 0

15 WNW 0

8 4

11 0

0 23 NW 0

5 2

1 0

0 8

NNW 0

1 1

6 0

0 8

Variable 0

0 0

Total 5

63 51 48 7

3 177 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-18

LaSalle County Generating Station Period of Record: April - June 2021 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

5 16 2

0 0

0 23 NNE 8

9 0

0 0

0 17 NE 5

9 1

0 0

0 15 ENE 17 4

1 0

0 0

22 E

23 8

4 1

0 0

36 ESE 10 12 4

0 0

0 26 SE 6

26 8

1 0

0 41 SSE 9

27 12 4

0 0

52 s

2 27 27 4

0 0

60 SSW 1

17 18 13 9

0 58 SW 5

13 23 5

1 0

47 WSW 2

17 11 3

0 1

34 w

3 18 17 2

0 0

40 WNW 8

7 7

2 0

0 24 NW 1

5 12 1

0 0

19 NNW 3

4 6

0 0

0 13 Variable 0

0 0

Total 108 219 153 36 10 1

527 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-19

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class - Moderately Stable -

200Ft-33Ft Delta-T (F)

Winds f'leasured at 33 Feet Wind Speed ( in mph)

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

> 24 Total N

7 2

0 0

9 NNE 2

1 0

0 0

0 3

NE 7

0 0

0 7

ENE 19 2

0 0

21 E

22 7

3 0

0 0

32 ESE 13 8

4 0

0 0

25 SE 1

4 1

1 0

0 7

SSE 0

6 2

0 0

0 8

s 3

5 5

3 0

0 16 SSW 0

4 10 7

0 0

21 SW 0

1 10 6

0 0

17 WSW 6

4 6

6 0

0 22 w

7 5

10 0

0 0

22 WNW 7

10 1

0 0

0 18 NW 3

3 0

0 0

0 6

NNW 4

0 0

0 4

Variable 0

0 0

Total 10 1 62 52 23 0

0 238 Hours of calm in this stability class :

5 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-20

LaSalle County Generating Station Period of Record: April - June 2021 Stability Class -

Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

2 0

0 0

2 NNE 4

0 0

0 4

NE 5

0 0

0 5

ENE 11 0

0 0

11 E

17 0

0 0

17 ESE 5

1 0

0 0

0 6

SE 2

0 0

0 2

SSE 1

2 3

0 0

0 6

s 1

1 16 0

0 0

18 SSW 1

2 9

1 0

0 13 SW 2

4 6

0 0

0 12 WSW 2

2 12 0

0 0

16 w

4 2

0 0

6 WNW 10 1

0 0

11 NW 9

0 0

0 9

NNW 9

0 0

0 9

Variable 0

0 0

Total 85 15 46 1

0 0

14 7 Hours of calm in this stability class :

5 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-21

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class -

Extremely Unstable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

2 2

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

w 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

2 2

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-22

LaSalle County Generating Station Period of Record : April - June 2021 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

1 1

s 0

0 0

2 2

SSW 0

0 0

5 5

SW 0

1 0

0 0

2 3

WSW 0

0 0

1 1

w 0

0 0

0 4

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

l 0

0 4

l 16 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-23

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class - Slightly Unstable -

37 5Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 2

2 0

4 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

1 0

0 1

s 0

0 0

3 2

3 8

SSW 0

0 0

1 3

6 10 SW 0

0 0

0 6

5 11 WSW 0

0 0

0 1

l 2

w 0

0 0

0 6

WNW 0

0 0

2 3

0 5

NW 0

0 0

1 0

0 1

NNW 0

0 0

2 0

0 2

Variable 0

0 0

Total 0

0 0

12 23 15 50 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes:

3 F-24

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class -

Neutral -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 18 27 24 10 0

79 NNE 2

13 22 11 5

0 53 NE 1

11 13 21 19 0

65 ENE 2

25 31 22 9

1 90 E

4 13 9

9 7

0 42 ESE 6

10 11 10 0

0 37 SE 2

14 6

5 3

0 30 SSE 3

11 6

11 7

1 39 s

2 19 22 21 25 8

97 SSW 1

7 28 30 26 8

100 SW 2

10 19 29 15 7

82 WSW 4

17 18 23 12 3

77 w

2 10 18 18 15 0

63 WNW 1

6 9

21 2 3 1

61 NW 2

9 5

28 16 2

62 NNW 2

7 16 33 6

1 65 Variable 0

0 0

Total 36 200 260 316 198 32 1042 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes :

3 F-25

LaSalle County Generating Station Period of Record : April - June 2021 Stability Class - Slightly Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed ( in mph)

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

> 24 Total N

0 1

11 9

1 0

22 NNE 1

6 12 10 0

0 29 NE 0

6 16 12 2

0 36 ENE 2

18 12 3

0 0

35 E

1 8

17 15 1

0 42 ESE 0

14 10 20 4

0 48 SE 3

13 13 15 3

2 49 SSE 0

13 8

34 10 1

66 s

0 10 27 44 25 6

112 SSW 1

16 26 41 21 19 124 SW 0

12 12 21 14 13 72 WSW 0

3 11 12 6

1 33 w

0 6

19 11 7

0 43 WNW 3

2 12 20 10 0

47 NW 1

3 8

11 4

0 27 NNW 0

1 5

10 8

0 24 Variable 0

0 0

Total 12 132 219 288 116 42 809 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-26

LaSalle County Generating Station Period of Record : April - June 2021 Stability Class -

Moderately Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 2

1 1

0 0

4 NNE 0

6 4

2 0

0 12 NE 0

5 4

1 0

0 10 ENE 1

3 1

0 0

0 5

E 0

2 0

0 0

0 2

ESE 0

3 3

1 0

0 7

SE 0

5 6

3 1

0 15 SSE 0

4 4

3 0

1 12 s

1 1

4 7

6 2

21 SSW 1

3 5

10 12 7

38 SW 4

3 3

7 10 4

31 WSW 3

4 2

9 3

5 26 w

1 2

7 6

6 1

23 WNW 1

3 2

3 0

1 10 NW 1

5 1

6 0

0 13 NNW 1

2 0

1 0

0 4

Variable 0

0 0

Total 14 53 47 0

38 21 233 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

3 F-27

LaSalle County Generating Station Period of Record : April -

June 2021 Stability Class -

Extremely Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

NNE NE ENE E

ESE SE SSE s

SSW SW WSW w

WNW NW NNW Variable Total 0

0 0

0 1

3 1

0 0

5 0

0 1

0 0

0 2

4 2

3 1

0 0

1 3 Hours of calm in this stability class :

0 0

0 1

0 0

0 1

0 0

3 4

0 0

9 0

0 0

0 2

0 0

2 0

0 0

0 Hours of missing wind measurements in this stability class :

0 0

0 2

0 0

0 3

0 2

7 7

6 2

0 0

2 9 Hours of missing stability measurements in all stability classes :

3 F-28

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class -

Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

1 1

0 0

0 2

NE 0

2 0

0 0

0 2

ENE 0

1 0

0 0

0 1

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 1

1 1

0 3

SW 0

0 5

1 1

0 7

WSW 0

0 8

0 0

0 8

w 0

1 1

0 0

0 2

WNW 0

2 0

0 0

0 2

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

7 16 2

2 0

27 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-29

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Moderately Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 1

0 0

2 NNE 0

3 2

0 0

0 5

NE 1

1 4

0 0

0 6

ENE 0

0 3

0 0

0 3

E 0

2 1

1 0

0 4

ESE 0

0 1

0 0

0 1

SE 0

0 1

0 0

0 1

SSE 0

0 0

s 0

0 5

0 0

0 5

SSW 0

2 8

2 0

0 12 SW 0

1 8

3 2

0 14 WSW 0

8 6

4 0

0 18 w

0 9

2 1

0 0

12 WNW 0

5 4

1 0

0 10 NW 0

6 1

0 0

0 7

NNW 0

1 0

0 0

0 1

Variable 0

0 0

Total 1

39 46 13 2

0 10 1 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-30

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Slightly Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

1 2

3 0

0 0

6 NNE 0

3 0

0 0

0 3

NE 0

6 6

0 0

0 12 ENE 2

4 5

1 0

0 12 E

1 5

4 0

0 0

10 ESE 0

1 1

0 0

0 2

SE 0

3 1

0 0

0 4

SSE 0

2 5

0 0

0 7

s 1

6 9

4 0

0 20 SSW 0

3 17 3

1 0

24 SW 0

3 25 7

0 0

35 WSW 0

4 5

11 0

0 20 w

0 11 7

6 0

0 24 WNW 0

9 6

4 3

0 22 NW 0

7 2

4 0

0 13 NNW 1

3 1

0 9

Variable 0

0 0

Total 6

72 97 43 5

0 223 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-31

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Neutral - 200Ft-33Ft Delta-T ( F )

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

5 28 11 3

0 0

47 NNE 3

28 5

0 0

0 36 NE 4

63 32 0

0 0

99 ENE 12 55 5

2 0

0 74 E

7 23 8

0 0

0 38 ESE 2

11 7

0 0

0 20 SE 5

9 13 1

0 0

28 SSE 1

7 18 1

0 0

27 s

1 10 31 4

0 0

46 SSW 1

11 26 24 1

0 63 SW 0

12 43 17 3

0 75 WSW 3

14 14 5

2 0

38 w

1 22 8

7 1

0 39 WNW 3

15 10 3

0 0

31 NW 7

9 7

8 0

0 31 NNW 8

26 21 18 0

0 73 Variable 0

0 0

Total 63 343 259 93 7

0 765 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-32

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Slightly Stable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

NNE NE ENE E

ESE SE SSE s

SSW SW WSW w

WNW NW NNW Variable Total 6

7 7

14 13 9

3 3

0 1

2 2

5 8

7 5

0 92 27 25 9

19 13 10 6

16 19 13 28 23 16 9

13 14 0

260 3

8 8

23 4

0 1

11 22 42 35 13 2

8 11 8

0 199 Hours of calm in this stability class :

0 0

1 0

0 0

1 1

12 15 3

1 2

2 1

0 39 0

0 0

0 Hours of missing wind measurements in this stability class :

0 36 40 24 57 30 19 10 31 42 68 80 41 24 27 33 28 0

590 Hours of missing stability measurements in all stability classes :

0 F-33

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class -

Moderately Stable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

4 8

0 0

12 NNE 1

1 0

0 0

0 2

NE 3

0 0

0 3

ENE 1

7 6

0 0

0 14 E

7 25 7

0 0

0 39 ESE 4

13 0

0 0

0 17 SE 2

12 0

0 0

0 14 SSE 2

11 1

0 0

0 14 s

4 25 9

0 0

0 38 SSW 4

24 6

0 0

0 34 SW 2

7 14 3

0 0

26 WSW 2

13 8

2 0

0 25 w

6 13 3

0 0

0 22 WNW 3

15 1

0 0

0 19 NW 5

6 1

0 0

0 12 NNW 1

2 1

0 0

0 4

Variable 0

0 0

Total 51 182 57 5

0 0

295 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-34

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class -

Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

1 0

0 0

1 NNE 1

0 0

0 1

NE 0

0 0

ENE 3

3 1

0 0

0 7

E 2

17 2

0 0

0 21 ESE 1

16 0

0 0

0 17 SE 3

12 0

0 0

0 15 SSE 2

20 3

0 0

0 25 s

1 15 4

0 0

0 20 SSW 0

11 1

0 0

0 12 SW 0

12 11 0

0 0

23 WSW 3

4 4

0 0

0 11 w

6 9

0 0

15 WNW 12 13 4

0 0

0 29 NW 6

0 0

0 6

NNW 4

0 0

0 4

Variable 0

0 0

Total 45 132 30 0

0 0

207 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-35

LaSalle County Generating Station Period of Record: July -

September 2021 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

w 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-36

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Moderately Unstable -

375Ft-33Ft Delta-T (Fl Winds Measured at 375 Feet Wind Direction N

NNE NE ENE E

ESE SE SSE s

SSW SW WSW w

WNW NW NNW Variable Total 1-3 0

0 0

0 4-7 0

0 0

0 Wind Speed (in mph) 8-12 0

0 0

0 13-18 0

0 0

0 Hours of calm in this stability class :

0 19-24 0

0 0

0

> 24 0

0 0

1 1

0 0

2 Hours of missing wind measurements in this stability class :

0 Total 0

0 0

1 1

0 0

2 Hours of missing stability measurements in all stability classes :

0 F-37

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Slightly Unstable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

2 0

0 2

ENE 0

0 2

0 0

0 2

E 0

0 0

1 0

0 1

ESE 0

0 1

0 0

0 1

SE 0

0 0

SSE 0

0 1

0 0

0 1

s 0

0 2

0 0

0 2

SSW 0

0 0

3 2

1 6

SW 0

0 0

1 1

2 4

WSW 0

0 0

0 1

w 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 6

7 4

3 20 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-38

LaSalle County Generating Station Period of Record: July -

September 2021 Stability Class -

Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 37 5 Feet Wind Speed (in mph)

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

> 24 Total N

3 20 17 6

16 0

62 NNE 2

18 22 13 2

0 57 NE 5

24 39 46 5

0 119 ENE 1

18 25 10 3

0 57 E

0 18 28 5

0 0

51 ESE 3

5 18 0

0 0

26 SE 3

9 10 2

0 0

24 SSE 1

4 16 8

3 0

32 s

0 14 25 19 6

0 64 SSW 1

13 26 28 23 9

100 SW 0

14 41 39 17 10 121 WSW 1

17 32 13 14 2

79 w

2 18 18 10 4

2 54 WNW 3

10 25 13 6

3 60 NW 0

13 19 14 14 0

60 NNW 0

16 22 11 9

3 61 Variable 0

0 0

Total 25 231 383 237 122 29 1027 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-39

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measu r ed at 37 5 Feet Wind Speed (in mph)

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

> 24 Total N

1 10 10 14 4

0 39 NNE 0

7 23 18 1

0 49 NE 2

8 23 22 5

0 60 ENE 1

11 15 7

7 0

41 E

1 15 25 13 3

1 58 ESE 0

9 9

7 0

0 25 SE 0

6 7

0 0

0 13 SSE 0

6 5

14 8

0 33 s

2 8

6 25 18 1

60 SSW 0

1 13 34 45 8

101 SW 1

4 29 35 25 18 112 WSW 1

6 7

18 11 2

45 w

1 4

9 19 7

1 41 WNW 0

4 4

11 1

0 20 NW 1

4 11 8

3 1

28 NNW 0

5 7

18 9

4 43 Variable 0

0 0

Total 11 108 203 263 147 36 768 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-40

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class - Moderately Stable -

375Ft-33Ft Delta-T (F)

Winds Mea s ured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

7 6

0 0

13 NNE 0

0 5

0 1

0 6

NE 0

1 0

3 0

0 4

ENE 0

2 0

0 1

0 3

E 1

0 1

7 11 0

20 ESE 1

1 2

16 7

0 27 SE 0

1 5

17 1

0 24 SSE 2

4 7

10 0

0 23 s

2 3

5 20 5

0 35 SSW 0

4 5

12 3

1 25 SW 2

7 9

26 7

4 55 WSW 0

6 0

9 4

7 26 w

2 8

6 6

0 0

22 WNW 2

3 12 9

0 0

26 NW 0

2 13 15 5

0 35 NNW 0

1 2

5 0

0 8

Variable 0

0 0

Total 12 43 79 161 45 12 352 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-41

LaSalle County Generating Station Period of Record : July -

September 2021 Stability Class -

Extremely Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

2 0

0 2

SE 0

0 0

6 0

0 6

SSE 0

0 1

3 1

0 5

s 0

0 2

2 2

0 6

SSW 0

0 2

0 0

0 2

SW 0

0 1

0 2

WSW 0

0 1

0 2

w 0

0 3

6 0

0 9

WNW 0

2 0

1 0

0 3

NW 0

1 0

0 2

NNW 0

0 0

Variable 0

0 0

Total 0

3 10 2

5 0

39 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

0 F-42

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Extremely Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

w 0

0 0

1 1

0 2

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

1 1

0 2

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-43

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Moderately Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

1 0

0 1

SE 0

0 0

SSE 0

0 0

s 0

0 1

1 0

0 2

SSW 0

0 0

1 0

0 1

SW 0

0 0

1 0

0 1

WSW 0

0 0

w 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 1

4 0

0 5

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-44

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Slightly Unstable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

1 0

0 1

E 0

0 0

ESE 0

0 0

3 0

0 3

SE 0

0 0

SSE 0

0 1

1 0

0 2

s 0

0 6

2 0

0 8

SSW 0

0 4

3 0

0 7

SW 0

0 2

9 1

0 12 WSW 0

0 1

0 0

0 1

w 0

0 0

1 0

2 3

WNW 0

0 4

4 0

0 8

NW 0

0 0

1 0

0 1

NNW 0

0 0

Variable 0

0 0

Total 0

0 18 25 1

2 46 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-45

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Neutral -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 34 22 12 0

0 68 NNE 1

11 21 5

0 0

38 NE 0

7 16 4

2 0

29 ENE 0

5 31 34 12 2

84 E

1 5

24 13 1

0 44 ESE 0

6 8

10 3

0 27 SE 0

10 17 12 0

0 39 SSE 0

9 21 10 1

1 42 s

1 14 23 16 8

0 62 SSW 1

12 32 20 8

3 76 SW 0

12 16 15 2

0 45 WSW 0

9 5

17 16 3

50 w

1 11 28 36 18 2

96 WNW 0

12 36 42 15 0

105 NW 0

3 13 21 5

0 42 NNW 0

16 29 35 2

0 82 Variable 0

0 0

Total 5

176 342 302 93 11 929 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-46

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Slightly Stable -

200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Direction N

NNE NE ENE E

ESE SE SSE s

SSW SW WSW w

WNW NW NNW Variable Total 1-3 1

0 1

2 0

0 2

1 1

2 1

0 1

1 0

4 4-7 24 7

1 2

10 8

4 8

14 10 7

11 11 12 14 12 0

155 Wind Speed (in mph) 8-12 5

5 7

13 27 5

13 14 22 22 10 10 34 43 8

9 0

2 47 13-18 0

0 0

1 12 5

7 24 43 25 17 12 16 17 2

1 0

182 Hours of calm in this stability class :

0 19-24 0

0 0

0 1

4 7

6 2

1 9

10 0

0 0

40

> 24 0

0 0

0 1

0 7

4 0

1 7

19 0

0 0

39 Hours of missing wind measurements in this stability class :

0 Total 30 12 9

18 49 18 28 51 94 69 37 35 78 101 25 23 0

677 Hours of missing stability measurements in all stability classes :

2 F-47

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

0 3

0 0

3 NNE 0

2 0

0 0

0 2

NE 1

1 0

0 0

0 2

ENE 2

1 3

0 0

0 6

E 1

14 14 0

0 0

29 ESE 0

9 2

0 0

0 11 SE 2

8 3

4 0

0 17 SSE 2

13 6

1 0

0 22 s

4 12 14 4

0 0

34 SSW 4

10 12 17 0

0 43 SW 1

5 16 14 0

0 36 WSW 1

7 10 10 0

0 28 w

1 14 23 0

0 0

38 WNW 1

14 18 0

0 0

33 NW 1

3 2

0 0

0 6

NNW 3

4 0

0 0

0 7

Variable 0

0 0

Total 24 120 123 50 0

0 3 17 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-48

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class -

Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

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

> 24 Total N

2 0

0 0

2 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 1

8 5

0 0

0 14 ESE 0

18 4

0 0

0 22 SE 0

23 3

0 0

0 26 SSE 0

8 2

0 0

0 10 s

1 28 15 0

0 0

44 SSW 1

15 23 0

0 0

39 SW 0

9 4

3 0

0 16 WSW 0

6 13 0

0 0

19 w

0 22 6

1 0

0 29 WNW 0

4 0

0 0

0 4

NW 1

2 0

0 0

0 3

NNW 0

2 0

0 0

0 2

Variable 0

0 0

Total 6

1 45 75 4

0 0

2 30 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-49

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class -

Extremely Unstable - 375Ft-33Ft Delta-T (F) t-Jinds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

1 0

0 1

w 0

0 0

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

1 0

0 1

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-50

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Moderately Unstable -

37 5Ft-33Ft Delta-T (F)

Winds Measured at 37 5 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

w 0

0 0

0 1

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

0 1

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-51

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Slightly Unstable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 0

SSE 0

0 0

s 0

0 0

SSW 0

0 0

SW 0

0 0

WSW 0

0 0

w 0

0 0

wmv 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

0 0

Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-52

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class -

Neutral -

375Ft-33Ft Delta-T (F)

Winds Meas ured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 11 14 16 19 5

65 NNE 0

6 18 26 1

4 55 NE 1

9 6

14 8

3 41 ENE 0

3 11 33 22 13 82 E

0 3

12 19 12 6

52 ESE 0

3 6

10 5

4 28 SE 0

6 6

16 8

0 36 SSE 0

2 10 24 8

3 47 s

1 6

14 24 16 23 84 SSW 0

4 23 15 23 12 77 SW 0

9 22 21 17 6

75 WSW 0

3 7

9 13 21 53 w

0 3

11 25 23 25 87 WNW 0

6 25 38 28 15 112 NW 0

3 9

18 28 21 79 NNW 1

7 8

19 10 6

51 Variable 0

0 0

Total 3

8 4 2 02 327 2 41 167 1024 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-53

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 37 5 Feet Wind Speed ( in mph)

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

> 24 Total N

1 4

12 7

6 0

30 NNE 0

2 5

14 1

0 22 NE 1

5 3

6 2

0 17 ENE 0

2 2

7 4

0 15 E

0 2

8 9

17 8

44 ESE 0

2 6

9 14 2

33 SE 1

0 5

3 5

9 23 SSE 0

2 3

12 15 21 53 s

0 6

7 24 21 42 100 SSW 0

8 14 12 37 37 108 SW 1

4 12 12 25 26 80 WSW 2

6 5

8 11 13 45 w

0 3

9 9

13 25 59 WNW 1

0 10 40 42 44 137 NW 0

1 11 20 18 4

54 NNW 0

2 4

9 4

0 19 Variable 0

0 0

Total 7

49 116 201 235 231 839 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-54

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Moderately Stable -

375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 1

1 3

0 0

5 NNE 0

1 4

1 2

0 8

NE 0

2 4

0 0

0 6

ENE 0

3 1

1 1

0 6

E 1

1 1

5 7

1 16 ESE 0

1 2

6 2

0 11 SE 0

1 4

8 3

0 16 SSE 1

1 2

2 6

1 13 s

0 3

8 15 8

3 37 SSW 0

4 5

9 14 4

36 SW 0

10 2

4 13 9

38 WSW 1

2 5

0 4

4 16 w

0 3

6 5

7 0

21 WNW 0

2 7

16 11 1

37 NW 0

1 3

6 2

0 12 NNW 0

0 4

0 1

0 5

Variable 0

0 0

Total 3

36 59 81 81 23 283 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-55

LaSalle County Generating Station Period of Record : October -

December 2021 Stability Class - Extremely Stable -

37 5Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

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

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

0 6

5 1

0 12 SSE 0

2 3

4 1

0 10 s

0 0

3 2

1 0

6 SSW 0

0 4

7 2

0 13 SW 0

0 1

4 0

0 5

WSW 0

0 4

1 2

0 7

w 0

0 5

0 0

0 5

WNW 0

0 0

NW 0

0 0

NNW 0

0 0

Variable 0

0 0

Total 0

2 26 23 7

0 58 Hours of calm in this stability class :

0 Hours of missing wind measurements in this stability class :

0 Hours of missing stability measurements in all stability classes :

2 F-56

APPENDIX G ERRATA DATA

Intentionally left blank

There is no errata data for 2021.

Intentionally left blank

APPENDIX H ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank

Docket No:

50-373 50-374 LASALLE COUNTY STATION UNITS 1 and 2 Annual Radiological Groundwater Protection Program Report 1 January through 31 December 2021 Prepared By Teledyne Brown Engineering Environmental Services

~

'T rx Exelon Generation LaSalle County Station Marseilles, IL 61341 May 2022

Intentionally left blank

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

1. Background Concentrations of Tritium...................................................... 7 IV. Results and Discussion........................................................................................... 10 A. Groundwater Results........................................................................................ 10 B. Surface Water Results...................................................................................... 11 C. Drinking Water Well Survey.............................................................................. 11 D. Summary of Results - Inter-laboratory Comparison Program............................. 11 E. Leaks, Spills, and Releases................................................................................ 11 F. Trends................................................................................................................ 11 G. Investigations..................................................................................................... 11 H. Actions Taken.................................................................................................... 12

Appendices Appendix A Location Designation Tables Table A-1 Figures Figure A-1 Appendix B Tables Table B-1.1 Table B-1.2 Table B-1.3 LaSalle County Station Groundwater Monitoring Sample Point List, 2021 LaSalle County Station Map of Groundwater Monitoring Sampling Locations, 2021 Data Tables Concentrations of Tritium, Strontium, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2021 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2021 Concentrations of Hard-to-Detects in Groundwater Samples Collected as Part of the Radiological Groundwater Protection Program, LaSalle County Station, 2021 ii

I.

Summary and Conclusions In 2006, Exelon instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of LaSalle County Station. This evaluation involved numerous station personnel and contractor support personnel. Following baseline sampling and subsequent recommendations, LaSalle's Radiological Groundwater Protection Program (RGPP) program now consists of the four surface water and twenty groundwater well sampling locations. The results for LaSalle's RGPP sampling efforts in 2021 are included in this report.

This is the sixteenth in a series of annual reports on the status of the RGPP conducted at LaSalle County Station. This report covers groundwater and surface water samples, collected from the environment, both on and off station property in 2021. During that time period, 190 analyses were performed on 59 samples from 19 groundwater locations. The monitoring was conducted by station personnel.

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

Strontium-89 (Sr-89) and strontium-90 (Sr-90) were not detected in any groundwater samples during 2021.

No gamma emitting radionuclides attributable to licensed plant operations were detected in any of the groundwater or surface water samples.

In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection (LLD) 100 times lower than that required by federal regulation. The United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) is 20,000 pCi/L.

Tritium levels were detected at concentrations greater than the LLD of 200 pCi/L in 19 of 59 groundwater samples analyzed. The tritium concentrations ranged from <LLD to 5,000 +/- 560 pCi/L. The elevated tritium levels (>200 pCi/L) being observed in groundwater are associated with the U 1 CY tank leak that occurred in the June/July 2010 timeframe, as documented in the Station's 10 CFR

50. 75(g) report. Chemistry performed weekly pump downs of Well 118S during October and November, which resulted in the tritium concentration for the fourth quarter moving from about 5,000 pCi/L to< LLD.

Gross alpha analysis in the dissolved and suspended fractions was performed for 12 locations during the 1st quarter of 2021. Gross alpha (dissolved) was detected in 1 of 12 samples with a concentration of 3.4 pCi/L. Gross alpha (suspended) was detected in 5 of 12 samples. The concentrations ranged from 3.5 to 17.2 pCi/L.

Hard-to-detect analyses were performed on 12 of the groundwater sampling locations in accordance with the LaSalle RGPP and to aid in establishing background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, and U-238. U-234 was detected in 4 samples, affecting 4 of 12 groundwater locations. The U-234 concentrations ranged from 0.49 to 1.12 pCi/L. U-238 was detected in 3 samples, affecting 3 of 12 groundwater locations. The U-238 concentrations ranged from 0.71 to 0.98 pCi/L. U-234 and U-238 are commonly found in groundwater at low concentrations due to the naturally occurring Radium (Uranium) Decay Series.

11.

Introduction The LaSalle County Station (LSCS), consisting of two boiling water reactors, each rated for 3,546 MWt, owned and operated by Exelon Corporation, is located in LaSalle County, Illinois. Unit 1 went critical on March 16, 1982. Unit 2 went critical on December 2, 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 2021.

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:

1.

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.

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

3.

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

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

5.

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

C.

Program Description

1.

Sample Collection Sample locations can be found in Figure 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 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-? 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 2021. Sample and analysis and frequency is based upon well location, assessed risk and site hydrogeology as described in the RGPP.

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

1.

Concentrations of gamma emitters in groundwater

2.

Concentrations of strontium in groundwater

3.

Concentrations of tritium in groundwater

4.

Concentrations of gross alpha (dissolved and suspended) in groundwater

5.

Concentrations of Am-241 in groundwater

6.

Concentrations of Cm-242 and Cm-243/244 in groundwater

7.

Concentrations of Pu-238 and Pu-239/240 in groundwater

8.

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

9.

Concentrations of Fe-55 in groundwater

10. Concentrations of Ni-63 in groundwater B.

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

1.

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

2.

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

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

Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

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

C.

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

1.

Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others.

Additional detail may be found by consulting references (CRA 2006).

a.

Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, "Cosmogenic" tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle.

Below ground, "lithogenic" tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and strontium-90 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 worldwide from 1960 to 2006. RadNet provides tritium precipitation concentration data for samples collected at stations throughout the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons.

Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time.

Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. LaSalle's 1979 or 1981 pre-operational REMP showed precipitation tritium concentrations

>300 pCi/L. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

c.

Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River.

Illinois surface water data were typically less than 100 pCi/L.

Illinois River H-3 results have shown >200 pCi/L, as evidenced in LaSalle's REMP program sample results. This is attributable to releases from 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.

- 9.

IV.

Results and Discussion A.

Groundwater Results Samples were collected from onsite wells throughout the year in accordance with the station radiological groundwater protection program.

Analytical results and anomalies are discussed below.

Tritium Samples from 19 locations were analyzed for tritium activity. Tritium values ranged from <LLD to 5,000 pCi/L. The highest tritium activity was found at well TW-LS-11 BS. The well is located predominantly in clay till.

Chemistry performed weekly pump downs of the well during October and November to support localized remediation. The pumping resulted in the tritium concentration for the fourth quarter moving from about 5,000 pCi/L to < LLD. Based on the hydrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply. Based on established aquifer flow paths the location most representative of potential offsite release into groundwater was also less than the detection limit.

(Table B-1.1, Appendix B)

Strontium A total of 12 samples from 12 groundwater locations were analyzed for Sr-89 and Sr-90. The results were less than the required detection limit of 10 pCi/L for Sr-89 and less than the required detection limit of 1.0 pCi/liter for Sr-90. (Table B-1.1, Appendix B)

Gross Alpha (dissolved and suspended)

Gross alpha in the dissolved and suspended fractions were performed on groundwater samples in the 1st quarter of 2021. Gross alpha (dissolved) was detected in 1 of 12 samples affecting 1 of 12 groundwater locations analyzed. The concentrations was 3.4 pCi/L. Gross alpha (suspended) was detected in 4 of 12 samples affecting 4 of 12 groundwater locations analyzed. The concentrations ranged from 3.5 to 17.2 pCi/L.

The concentrations of gross alpha which are slightly above detectable levels are considered to be background and are not the result of plant effluents. (Table B-1.1, Appendix B)

Gamma Emitters No gamma emitting nuclides were detected in any of the samples analyzed. (Table B-1.2, Appendix B)

Hard-To-Detect Hard-to-detect analyses were performed on 12 of the groundwater sampling locations in accordance with the LaSalle RGPP and to aid in establishing background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, and U-238. U-234 was detected in 4 of 12 samples, affecting 4 of 12 groundwater locations. U-234 concentrations ranged from 0.49 to 1.12 pCi/L. U-238 was detected in 3 of 12 samples, affecting 3 of 12 groundwater locations. The U-238 concentrations ranged from 0.71 to 0.98 pCi/L. U-234 and U-238 are commonly found in groundwater at low concentrations due to the naturally occurring Radium (Uranium) Decay Series. The concentrations of U-234 and U-238 discussed above are considered to be background and are not the result of plant effluents.

(Table B-1.3, Appendix B)

All other hard-to-detect nuclides were not detected at concentrations greater than their respective minimum detectable concentrations.

B.

Surface Water Results No surface water samples were collected in 2021.

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 TSE and Environmental Inc. (Midwest Labs) are presented in the AREOR.

E.

Leaks, Spills, and Releases There were no new leaks identified at LaSalle Station during the reporting period.

F.

Trends Analysis results from samples continue to be trended in order to assess impact to groundwater at LaSalle Station. There were no new leaks identified in the reporting period. Sample data from the plume arising from the historic 2010 U1 CY tank leak is being trended per the LaSalle RGPP.

The plume had been dispersing with groundwater flow, and extraction wells have been installed to provide additional control of the plume migration (see Section H.3. below). Currently, no tritium has migrated offsite, and tritium migration offsite is not expected.

G.

Investigations No new investigations were carried out during the reporting period.

H.

Actions Taken

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

2. Installation of Monitoring Wells No new monitoring wells have been installed during the reporting period.

3. Actions to Recover/Reverse Plumes Two (2) extraction wells (RW-LS-100S and RW-LS-101 S) were installed to control the migration of the tritium plume near U1 CY tank.

RW-LS-100S became operational in October 2012. RW-LS-101 S became operational in April 2014.

APPENDIX A LOCATION DESIGNATION

Intentionally left blank

TABLE A-1 LaSalle County Station Groundwater Monitoring Sample Point List, 2021 Site HP-2 HP-5 HP-7 HP-10 MW-LS-101S MW-LS-102S MW-LS-103S MW-LS-104S MW-LS-105S MW-LS-106S MW-LS-107S MW-LS-108S MW-LS-109S MW-LS-110S MW-LS-111S MW-LS-112S MW-LS-113S RW-LS-100S RW-LS-101S SW-LS-101 SW-LS-102 SW-LS-103 SW-LS-106 TW-LS-114S TW-LS-115S TW-LS-116S TW-LS-117S TW-LS-118S TW-LS-119S TW-LS-120S TW-LS-121S A-1 Site Type Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Extraction Well Extraction Well Surface Water Surface Water Surface Water Surface Water Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well

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APPENDIX B DATA TABLES

Intentionally left blank

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis)

Gr-A (Sus)

HP-2 03/09/21

< 175 HP-5 03/09/21

< 175 HP-7 03/09/21

< 178

< 6.6

< 0.8

< 0.8 3.5 +/- 1.4 HP-7 06/05/21

< 178 HP-7 08/25/21

< 184 HP-7 11/30/21

< 194 HP-10 03/09/21

< 178 MW-LS-104S 03/08/21 2150 +/- 282

< 6.1

< 0.9

< 1.0

< 0.7 MW-LS-104S 06/05/21 1200 +/- 189 MW-LS-104S 08/24/21 1490 +/- 219 MW-LS-104S 12/01/21 1290 +/- 202 MW-LS-105S 03/08/21

< 178

< 6.2

< 0.8

< 1.4 MW-LS-105S 06/05/21

< 179 MW-LS-105S 08/24/21

< 178 MW-LS-105S 11/30/21

< 181 MW-LS-106S 03/09/21

< 185 MW-LS-107S 03/08/21

< 186

< 7.3

< 0.9

< 4.5 4.3 +/- 1.1 MW-LS-107S 06/05/21

< 178 MW-LS-107S 08/24/21

< 184 MW-LS-107S 11/30/21

< 198 MW-LS-111S 03/09/21

< 185 OIL SEPARATOR 03/08/21

< 185

< 6.4

< 0.8

< 3.8

< 1.1 OIL SEPARATOR 06/05/21

< 186 OIL SEPARATOR 08/23/21

< 187 OIL SEPARATOR 11/30/21

< 175 RW-LS-100S 03/08/21 655 +/- 146

< 6.1

< 0.9

< 1.1

< 0.7 RW-LS-100S 06/05/21 1490 +/- 219 RW-LS-100S 08/24/21 1160 +/- 188 RW-LS-100S 11/30/21 935 +/- 168 RW-LS-101S 03/09/21 2360 +/- 302

< 7.8

< 0.9

< 1.0 15.3 +/- 3.7 RW-LS-101S 06/05/21 1070 +/- 181 RW-LS-101S 08/24/21 1320 +/- 201 RW-LS-101S 11/30/21 1960 +/- 269 TW-LS-114S 03/09/21

< 190 TW-LS-114S 06/05/21

< 186 TW-LS-114S 08/24/21

< 179 TW-LS-114S 12/01/21

< 184 TW-LS-116S 03/08/21 4420 +/- 506

< 6.2

< 0.9

< 0.8

< 0.7 TW-LS-116S 06/05/21 3080 +/- 371 TW-LS-116S 08/24/21 3910 +/- 453 TW-LS-116S 12/01/21 2860 +/- 354 TW-LS-117S 03/08/21

< 190

< 6.8

< 0.8 3.4 +/- 1.1

< 1.1 TW-LS-117S 06/05/21

< 183 TW-LS-117S 08/24/21

< 180 TW-LS-117S 11/30/21

< 191 TW-LS-118S 03/08/21 4710 +/- 533

< 7.6

< 0.9

< 0.8

< 0.7 TW-LS-118S 06/05/21 3710 +/- 435 TW-LS-118S 08/23/21 5000 +/- 560 TW-LS-118S 11/29/21

< 191 TW-LS-119S 03/08/21

< 188

< 5.7

< 0.9

< 3.9 17.2 +/- 2.3 TW-LS-119S 06/05/21

< 179 TW-LS-119S 08/23/21

< 187 TW-LS-119S 12/01/21

< 181 TW-LS-120S 03/08/21

< 194

< 5

< 1.0

< 3.1 6.64 +/- 4.0 TW-LS-120S 06/05/21

< 179 TW-LS-120S 08/23/21

< 188 TW-LS-120S 11/29/21

< 174 TW-LS-121S 03/08/21

< 185 TW-LS-121S 08/23/21

< 189 BOLD values = Unable to meet detection limits due to high solids conten t B-1

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 HP-2 03/09/21

< 15

< 16

< 2

<2

<4

< 2

<4

< 2

< 3

<4

< 2

< 10

< 3 HP-5 03/09/21

< 18

< 31

< 2

<2

< 5

<2

<4

<2

< 3

< 4

<2

< 2

< 11

< 4 HP-7 03/09/21

< 15

< 13

< 1

<3

<2

< 3

<2

< 3

<4

< 1

< 10

<4 HP-10 03/09/21

< 19

< 20

<2

< 2

< 5

<2

<4

<2

< 4

<6

< 2

< 14

<4 MW-LS-104S 03/08/21

< 18

< 33

<2

< 2

< 5

< 2

<4

< 2

<4

< 5

< 2

<2

< 12

<4 MW-LS-105S 03/08/21

< 14

< 31

< 2

<2

<4

< 2

< 3

< 2

< 3

< 4

<2

< 2

< 10

< 3 MW-LS-106S 03/09/21

< 17

< 18

< 2

<2

<4

<2

<4

<2

<4

< 4

<2

< 2

< 11

< 3 MW-LS-107S 03/08/21

< 11

< 13

< 1

< 3

< 1

< 2

< 1

< 2

<4

< 1

< 8

< 3 MW-LS-111S 03/09/21

< 18

< 35

<2

< 2

<4

< 2

<4

< 2

<4

<6

< 2

<2

< 13

< 5 OIL SEPARAl 03/08/21

< 18

< 37

< 2

<4

< 2

<4

< 2

<4

< 5

< 2

< 12

< 4 RW-LS-100S 03/08/21

< 18

< 21

< 2

< 5

<2

<4

<2

<4

< 5

< 2

< 11

<4 RW-LS-101S 03/09/21

< 20

<2

< 2

< 5

< 2

<4

<2

< 4

< 5

< 2

< 12

<4 OJ TW-LS-114S 03/09/21

< 17

<2

< 2

<4

< 2

<4

< 2

< 3

< 5

< 2

<2

< 12

< 3 I I\\)

TW-LS-116S 03/08/21

< 18

< 39

< 2

<2

< 5

< 2

<4

< 2

<4

< 5

< 2

< 12

< 4 TW-LS-117S 03/08/21

< 13

< 22

< 1

< 3

< 1

< 3

< 2

< 3

< 4

<2

< 1

< 9

< 3 TW-LS-118S 03/08/21

< 12

< 20

< 1

< 3

< 1

<3

< 1

<3

< 3

< 1

< 7

< 3 TW-LS-119S 03/08/21

< 20

< 36

< 2

< 5

< 3

<4

< 2

<4

< 5

< 2

<2

< 12

< 4 TW-LS-120S 03/08/21

< 16

< 33

< 2

<2

< 4

< 2

<4

< 2

< 3

< 6

< 2

< 12

< 4 TW-LS-121S 03/08/21

< 16

< 17

< 2

<2

<4

<2

< 3

<2

<4

< 4

<2

< 2

< 10

< 3

TABLE B-1.3 CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE GROUNDWATER PROTECTION PROGRAM, LASALLE COUNTY STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 Fe-55 Ni-63 HP-7 03/09/21

< 118

< 4.2 MW-LS-104S 03/08/21

< 0.13

< 0.02

< 0.09

< 0.16

< 0.09 0.93 +/- 0.28

< 0.10 0.96 +/- 0.28

< 73

< 4.7 MW-LS-105S 03/08/21

< 170

< 4.7 MW-LS-1075 03/08/21

< 116

< 4.0 OIL SEPARATOR 03/08/21

< 0.19

< 0.08

< 0.13

< 0.09

< 0.19 0.91 +/- 0.27

< 0.08 0.71 +/- 0.24

< 109

< 4.6 RW-LS-100S 03/08/21

< 0.05

< 0.03

< 0.15

< 0.17

< 0.14

< 0.07

< 0.05

< 178

< 4.2 RW-LS-101S 03/09/21

< 0.17

< 0.03

< 0.06

< 0.09

< 0.15 0.49 +/- 0.27

< 0.16

< 0.20

< 141

< 5.0 TW-LS-116S 03/08/21

< 107

< 4.5 TW-LS-117S 03/08/21

< 199

< 4.3 TW-LS-118S 03/08/21

< 0.15

< 0.04

< 0.05

< 0.05 1.12 +/- 0.33

< 0.07 0.98 +/- 0.30

< 145

< 4.5 TW-LS-119S 03/08/21

< 183

< 4.1 TW-LS-120S 03/08/21

< 123

< 4.5 CD I (,)

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RA22-020, Annual Radiological Environmental Operating Report

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RA22-020, Annual Radiological Environmental Operating Report

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