Text

2019 Annual Radiological Environmental Operating Report
	ML20135G950
Person / Time
Site:	LaSalle
Issue date:	05/13/2020
From:	Washko J; Exelon Generation Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	RA20-026
	Download: ML20135G950 (181)
	v • d • e

LaSalle County Station Exelon Generation ~, 2601 North 21 " Road Marseilles, IL 61341 815-415-2000 Telephone www .exeloncorp.com RA20-026 10 CFR 50 Appendix I May 13, 2020 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374

Subject:

2019 Annual Radiological Environmental Operating Report Enclosed is the Exelon Generation Company, LLC, 2019 Annual Radiological Environmental Operating Report for LaSalle County Station, submitted in accordance with Technical Specifications 5.6.2, "Annual Radiological Environmental Operating Report." The enclosed report contains the results of groundwater monitoring conducted in accordance with Exelon's Radiological Groundwater Protection Program, which is a voluntary program implemented in 2006. This information is being reported in accordance with a nuclear industry initiative.

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

Respectfully, J:aa.~~

Site Vice President LaSalle County Station

Enclosure:

LaSalle County Station Units 1 and 2 Annual Radiological Environmental Operating Report 1 January through 31 December 2019 cc: Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station

Docket No: 50-373 50-374 LASALLE COUNTY STATION UNITS 1and2 Annual Radiological Environmental Operating Report 1 January through 31 December 2019 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation LaSalle County Station Marseilles, IL 61341 May 2020

Intentionally left blank 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 ............................................................................................ 7 E. Program Changes ............................................................................................... 8 IV. Results and Discussion ..... ............................................................................................ 9 A. Aquatic Environment ........................................................................................... 9

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

2. Ground/Well Water ................................................................................... 9

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

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

1. Airborne .................................................................................................. 10

a. Air Particulates ............................................................................. 10

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

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

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

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

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

Appendices Appendix A Radiological Environmental Monitoring Report Annual Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the LaSalle County Station, 2019 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, LaSalle County Station, 2019 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2019 Figures Figure B-1 Inner Ring OSLO Locations of the LaSalle County Station, 2019 Figure B-2 Outer Ring OSLO Locations and Fixed Air Sampling Locations of the LaSalle County Station, 2019 Figure 8-3 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station, 2019 Appendix C Data Tables and Figures - Primary Laboratory Tables Table C-1.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-1.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-11.1 Concentrations of Tritium in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-11.2 Concentrations of Gamma Emitters in Ground/Well Water Samples Collected in the Vicinity of LaSalle County Station, 2019 ii

Table C-111.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2019 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, 2019 Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-Vl.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-Vll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-Vll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-Vlll.1 Concentrations of Gamma Emitters in Food Product Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-Vlll.2 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of LaSalle County Station, 2019 Table C-IX.1 Quarterly DLR Results for LaSalle County Station, 2019 Figures Figure C-1 Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2019 Figure C-2 Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2019 Figure C-3 Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2005 - 2019 Figure C-4 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2005 - 2019 Figure C-5 Air Particulate - Gross Beta - Station L-10 (C) Collected in the Vicinity of LSCS, 2005 - 2019 Figure C-6 Air Particulate - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LSCS, 2005 - 2019 Figure C-7 Air Particulate - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LSCS, 2005 - 2019 iii

Figure C-8 Air Particulate - Gross Beta - Station L-11A Collected in the Vicinity of LSCS, 2016 - 2019 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2019 Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services, 2019 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2019 Appendix E Effluent Data Appendix F Meteorological Data Appendix G Errata Data Appendix H 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 2019 through 31 December 2019. During that time period, 1,323 analyses were performed on 1,225 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.

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 lodine-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 l-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 2019 through 31 December 2019.

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 2019. Sample locations and descriptions can be found in Tables 8-1 and 8-2, and Figures 8-1 through 8-3, Appendix 8.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, ground/well water, fish, and sediment. Two gallon water samples were collected weekly from two surface water locations (L-21 and L-40) and composited for monthly and quarterly required analyses. Control location was L-21. Two ground/well water locations (L-27 and L-28) were also grab sampled quarterly. All samples were collected via grab sample. The samples were then transferred to new unused plastic containers. Both the grab container and the sample containers were rinsed with source water prior to actual sample collection. Fish samples were collected semiannually at three locations, L-34, L-35 and L-36 (Control). Sediment samples composed of recently deposited substrate were collected at three locations semiannually, L-21 (Control), L-40 and L-41.

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

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on samples of milk and food product. Samples 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-Quad Control, L-Quad 1, L-Quad 2, L-Quad 3 and L-Quad 4). The control location was L-Quad Control. 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 (OSLD) were deployed and Thermo-luminescent Dosimetry (TLD) were discontinued. This change may cause step changes in readings, up or down, depending on site characteristics. However, the relative comparison to control locations remains valid. OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

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

An inner ring consisting of 16 locations (L-101, L-102, L-103, L-104, L-105, L-106, L-107, L-108, L-109, L-110, L-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 16 locations (L-201, L-202, L-203, L-204, L-205, L-206, L-207, L-208, L-209, L-210, L-211, L-212, L-213, L-214, L-215 and L-216) extending to approximately 5 miles from the site designed to measure possible exposures to 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 % 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 TSE to collect and analyze, respectively, the environmental samples for radioactivity for the LSCS REMP in 2019. The analytical procedures used by the laboratory are listed in Table 8-2.

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 whiGh 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 For 2019, the LSCS REMP had a sample recovery rate of 98.5%. Sample anomalies and missed samples are listed in the tables below:

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date No apparent reason for lower reading of 172.5 hrs AP/Al L-03 01/17/19 (8 days run).

Low reading of 65.4 hrs possibly caused either by a power failure or a faulty timer. Timer will be replaced during the next AP/Al L-03 01/24/19 exchange. NOTE: Sample indicated a low value of 201.2 hrs on 13 days run; timer replaced on 02/08/19.

Collection of all samples rescheduled from 01/31/19 to ALL SAMPLES 02/01/19 02/01/19 due to extreme cold.

Lower reading of 161 .7 hrs (8 days run) caused possibly by a AP/Al L-01 02/01/19 power outage due to the extremely cold temperatures. NOTE:

On 02/06/19, timer indicated 120.2 hrs; normal for 5 days run.

Lower reading of 127.3 hrs (8 days run) caused possibly by a AP/Al L-08 02/01/19 power outage due to the extremely cold temperatures. NOTE:

On 02/06/19, timer indicated 119.9 hrs; normal for 5 days run.

Due to heavy snow, sample collected on 02/06/19 instead of AP/Al L-03 02/06/19 scheduled 02/01 /19.

Lower reading of 152.8 hrs on 8 day period due to pump AP/Al L-08 02/14/19 failure. Pump replaced.

Lower reading of 177.8 hrs on 8 day period due possibly to a AP/Al L-11A 02/14/19 power failure. NOTE: On 02/21/19, the timer indicated 167.9 hrs; normal for 7 days run.

AP/Al L-04 03/21/19 Low reading of 46.5 hrs due to recent power restoration.

The times indicate approximately 7 hrs less than the normal value for the 7 days' run . Possible power outage. NOTE: On AP/Al L-01 08/22/19 08/29/19, the timer indicated 168.6 hrs; normal time for the 7 days collection period.

Timer indicated 14.7 hrs less than the expected 192 hrs; AP/Al L-06 10/31/19 possible power failure due to wintry conditions.

Lower reading of 109.9 hrs during a 6 days period possibly AP/Al L-06 11/06/19 due to a power failure. Timer seems to operate correctly.

Lower reading of 120.1 hrs during the 8 day collection period.

AP/Al L-06 11/14/19 Timer exchanged.

Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Date Reason Type Code L-21 SW 02/01/19 No sample; water frozen L-40 02/06/19 SW L-40 No sample; water frozen 03/06/19 AP/Al L-04 03/14/19 No power at the station. Plant informed by collector.

Al L-05 07/10/19 Iodine cartridge missing in field.

Vegetables not collected due to lack of suitable crops VE CONTROL 3rd Qtr 2019 caused by the very rainy Spring and Summer.

09/19/19 10/02/19 Milk not available. Cows not milked due to the owner's Ml L-42 10/17/19 injury.

10/31/19 11/14/19 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 2019.

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 24 out of 24 samples with a range of 3.6 to 10.0 pCi/L. Concentrations detected were 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 6 of 8 samples. The concentrations ranged from 265 to 523 pCi/L.

Concentrations detected were consistent with those detected in previous years (Figure C-2, Appendix C).

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-11.2, 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-111.1, Appendix C). Naturally-occurring K-40 was found at all stations and ranged from 2, 185 to 4,328 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 Be-7 was found at all stations with concentrations ranging from 1, 118 to 4,482 pCi/L. Naturally- occurring K-40 was found at all stations and ranged from 8,784 to 18,600 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 111 (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 5 to 36E-3 pCi/m 3 with a mean of 16E-3 pCi/m 3 . The results from the near-site location (Grou~ II) ranged from 6 to 32E-3 pCi/m 3 with a mean of 16E-3 pCi/m .

The results from the far-field locations (Group Ill) ranged from 6 to 36E-3 pCi/m 3 with a mean of 16E-3 pCi/m 3 . The results from the control location (Group IV) ranged from 6 to 29E-3 pCi/m 3 with a mean of 16E-3 pCi/m 3 . Comparison of the 2019 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 2019 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 69 to 189 E-3 pCi/m 3 . 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) biweekly May through October and monthly December through April.

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 888 to . -*:.:::

1,274 pCi/I. No other nuclides were detected, and all required LLDs were met.

b. Food Products Food product samples were collected at four locations (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-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 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-one 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 25 mrem/quarter, with a range of 6.0 to 25.0 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 Survey A Land Use Survey conducted August 28, 2019, around the LaSalle County Station (LSCS) was performed by Environmental Inc. (Midwest Labs) for Exelon Nuclear to comply with Radiological Effluent Control 12.5.2 of the LaSalle's Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident, milk producing animal and garden of greater than 500 ft2 in each of the sixteen 22 % degree sectors around the site. The distance and direction of all locations from the LSCS reactor buildings were positioned using Global Positioning System (GPS) technology. There were no changes required to the LSCS REMP as a result of this survey. The results of this survey are summarized below:

Distance in Miles from the LSCS Reactor Buildings Sector Residence Livestock Milk Farm Miles Miles Miles A N 3.9 4.0 B NNE 1.6 1.7 C NE 2.1 3.5 D ENE 3.3 4.6 E E 3.2 14.2 F ESE 1.4 G SE 1.7 5.1 H SSE 1.8 4.7 J s 1.5 1.5 K SSW 0.7 L SW 1.0 5.8 M WSW 1.5 N W 1.7 3.0 P WNW 0.9 3.0 Q NW 1.7 3.3 R NNW 1.7 4.5 E. Errata Data There is no errata data for 2019.

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 TB E'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, 119 out of 129 analyses performed met the specified acceptance criteria. Ten analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TBE Corrective Action Program. A summary is found below:

1. The ERA April 2019 water Cs-134 result was evaluated as Not Acceptable. The reported value was 15.2 pCi/L (error 2.82 pCi/L) and the known result was 12.1 pCi/L (acceptance range of 8.39 -

14.4 pCi/L). With the error, the reported result overlaps the acceptable range. This sample was run as the workgroup duplicate on a different detector with a result of 10.7 pCi/L (within acceptable range). (NCR 19-10)

2. The ERA April 2019 water Sr-89 result was evaluated as Not Acceptable. The reported value was 44.9 pCi/L and the known result was 33.3 pCi/L (acceptance range of 24.5 - 40.1 pCi/L). The sample was only counted for 15 minutes instead of 200 minutes.

The sample was re-prepped in duplicate and counted for 200 minutes with results of 30.7 +/- 5.37 pCi/L and 33.0 +/- 8.71 pCi/L. This was the 1st "high" failure for Sr-89 in 5 years. (NCR 19-11)

3. The MAPEP February 2019 soil Sr-90 result was not submitted and therefore evaluated as Not Acceptable. The sample was run in duplicate, with results of -1.32 +/- 4.09 Bq/kg (<6.87) and -1.030 +/-

3.55 Bq/kg (<5.97). The known result was a false positive test (no significant activity). TBE did not submit a result because it appeared that the results may not be accurate. TBE analyzed a substitute soil Sr-90 sample from another vendor, with a result within the acceptable range. (NCR 19-12)

4. The MAPEP February 2019 water Am-241 result was evaluated as Not Acceptable. The reported value was 0.764 +/- 0.00725 Bq/L with a known result of 0.582 Bq/L (acceptable range 0.407 - 0.757 Bq/L).

TBE's result falls within the upper acceptable range with the error. It appeared that a non-radiological interference was added and lead to an increased mass and higher result. (NCR 19-13)

5. The MAPEP February 2019 vegetation Sr-90 result was evaluated as Not Acceptable. The reported result was -0.1060 +/- 0.0328 Bq/kg and the known result was a false positive test (no significant activity).

TBE's result was correct in that there was no activity. MAPEP's evaluation was a "statistical failure" at 3 standard deviations. (NCR 19-14)

6. The ERA October 2019 water Gross Alpha result was evaluated as Not Acceptable. TBE's reported result was 40.5 +/- 10.3 pCi/L and the known result was 27 .6 pCi/L (ratio of TBE to known result at 135%). With the associated error, the result falls within the acceptable range (14.0 - 36.3 pCi/L). The sample was run as the workgroup duplicate on a different detector with a result of 30.8 +/-

9.17 pCi/L (within the acceptable range). This was the first failure for drinking water Gr-A since 2012. (NCR 19-23)

7. The ERA October 2019 water Sr-90 result was evaluated as Not Acceptable. TBE's reported result was 32.5 +/- 2.12 pCi/L and the known result was 26.5 pCi/L (ratio of TBE to known result at 123%).

With the associated error, the result falls within the acceptable range (19.2 - 30 .9 pCi/L) . The sample was run as the workgroup duplicate on a different detector with a result of 20.0 +/- 1.91 pCi/L (within the acceptable range). Both TBE results are within internal QC limits. A substitute "quick response" sample was analyzed with an acceptable result of 18.6 pCi/L (known range of 13.2 - 22.1 pCi/L). (NCR 19-24)

8. The MAPEP August 2019 soil Ni-63 result of 436 +/- 22.8 Bq/kg was evaluated as Not Acceptable. The known result was 629 Bq/kg (acceptable range 440 - 818 Sq/sample). With the associated error, the TBE result falls within the lower acceptance range. All associated QC was acceptable. No reason for failure could be found. This is the first failure for soil Ni-63 since 2012. (NCR 19-25).

9. The MAPEP August 2019 water Am-241 result was not reported and therefore evaluated as Not Acceptable. Initial review of the results showed a large peak where Am-241 should be (same as the February, 2019 sample results). It is believed that Th-228 was intentionally added as an interference. The sample was re-prepped and analyzed using a smaller sample aliquot. The unusual large peak (Th-228) was seen again and also this time a smaller peak (Am-241 ). The result was 436 +/- 22.8 Bq/L (acceptable range 0.365 +/-

0.679 Bq/L). Th-228 is not a typical nuclide requested by clients, so there is no analytical purpose to take samples through an additional separation step. TBE will pursue using another vendor for Am-241 water cross-checks that more closely reflects actual customer samples. (NCR 19-26)

10. The Analytics September 2019 soil Cr-51 sample was evaluated as Not Acceptable. TBE's reported result of 0.765 +/- 0.135 pCi/g exceeded the upper acceptance range (140% of the known result of 0.547 pCi/g). The TBE result was within the acceptable range (0.63 - 0.90 pCi/g) with the associated error. The Cr-51 result is very close to TBE's normal detection limit. In order to get a reportable result, the sample must be counted for 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> (1 Ox longer than client samples). There is no client or regulatory requirement for this nuclide and TBE will remove Cr-51 from the reported gamma nuclides going forward. (NCR 19-27)

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, 2019 NAME OF FACILITY: LASALLE COUNTY STATION DOCKET NUMBER: 50-373 & 50.374 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: 2019 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# NONROUTINE (UN/TOF ANALYSES ANALYSES OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR*B 24 4 6.8 6.3 6.8 L-40 INDICATOR 0 (PClll..ITER) (12/12) (12/12) (12/12) ILLINOIS RIVER - DOWNSTREAM 3.6-9.8 4.0-10.0 5.2 MILES NNW OF SITE H-3 8 200 383 334 383 L-40 INDICATOR 0 (3/4) (3/4) (3/4) ILLINOIS RIVER - DOWNSTREAM 305-523 265-397 305 - 523 4.0 MILES NE OF SITE GAMMA 24 MN-54 15 <LLD <LLD 0 C0-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 l>

I C0-60 15 <LLD <LLD 0

~

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/tl/TER)

GAMMA 12 MN-54 15 <LLD <LLD 0 C0-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 C0-60 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, 2019 NAME OF FACILITY: LASALLE COUNTY STATION DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: 2019 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# NONROUTINE (UNITOF ANALYSES ANALYSES OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE ANO DIRECTION MEASUREMENTS FISH GAMMA 12 (PC/IKG WET) MN-54 130 <LLD <LLD 0 C0-58 130 <LLD <LLD - 0 FE-59 260 <LLD <LLD 0 C0-60 130 <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 CS-137 150 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 l>

I LA-140 NA <LLD <LLD 0 SEDIMENT GAMMA 6 (PCl/KG DRY) MN-54 NA <LLD <LLD 0 C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 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 16 15.9 16.6 L-08 INDICATOR 0 (E-3 PCVCU.METER) (413/414) (52152) (52/52) MARSEILLES 5-36 6-29 6-36 6.0 MILES NNW OF SITE AIR PARTICULATE GAMMA 36 (E-3 PC/ICU.METER) MN-54 NA <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, 2019 NAME OF FACILITY: LASALLE COUNTY STATION DOCKET NUMBER: 50.373 & 50.374 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: 2019 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# NONROUTINE (UNITOF ANALYSES ANALYSES OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 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 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 l>

w*

AIR IODINE GAMMA 465 (E-3 PCVCU.METER) 1-131 70 <LLD <LLD 0 MILK 1*131 15 1 NA <LLD 0 (PCIA.ITER)

GAMMA 15 MN-54 NA NA <LLD 0 C0-58 NA NA <LLD 0 FE-59 NA NA <LLD 0 C0-60 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 FOOD PRODUCTS GAMMA 10 (PCllKG WET) MN-54 NA <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, 2019 NAME OF FACILITY: LASALLE COUNTY STATION DOCKET NUMBER: 50-373 & 50-374 LOCATION OF FACILITY: MARSEILLES, IL REPORTING PERIOD: 2019 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# NONROUTINE (UNITOF ANALYSES ANALYSES OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 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

)>

I VEGETATION GAMMA 46

~

(PCllKG WET) MN-54 NA <LLD <LLD 0 C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 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-QUARTERLY 167 NA 61.9 14.3 19.2 L-102 INDICATOR 0 (MILLl-ROENTGENIQTR.) (1631163) (4/4) (4/4) 6.0 - 25.0 8.9-17.8 13.0-25.0 0.6 MILES NNE (MJ The Mean Values are calculated using the positive values (values ~ 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, 2019 Location Location Description Distance & Direction From Site A. Surface Water L-21 Illinois River at Seneca, Upstream (control) 4.0 miles NE L-40 Illinois River, Downstream (indicator) 5.2 miles NNW B. Ground/Well Water L-27 LSCS Onsite Well (indicator) O miles at station L-28-W4 Marseilles Well (control) 7.0miles NNW L-28-W5 Marseilles Well (control) 6.7miles NNW L-28-W6 Marseilles Well (indicator) 4.1 miles N C. Milk - bi-weekly I monthly L-42 Biros Farm (control) 14.2 miles E D. Air Particulates I Air Iodine L-01 Nearsite 1 (indicator) 1.5 miles NNW L-03 Onsite 3 (indicator) 1.0 miles ENE L-04 Rte. 170 (indicator) 3.2 miles E L-05 Onsite 5 (indicator) 0.3 miles ESE L-06 Nearsite 6 (indicator) 0.4milesW L-07 Seneca (indicator) 5.2 miles NNE L-08 Marseilles (indicator) 6.0miles NNW L-10 Streator (control) 13.5 miles SW L-11A Ransom (indicator) 6.0 miles S E. Fish L-34 LaSalle Cooling Lake (indicator) 2.0 miles E L-35 Marseilles Pool of Illinois River, Downstream (indicator) 6.5miles NNW L-36 Illinois River, Upstream of Discharge (control) 4.3 miles NE F. Sediment L-21 Illinois River at Seneca, Upstream (control) 4.0 miles NE L-40 Illinois River, Downstream (indicator) 5.2 miles NNW L-41 Illinois River, Downstream (indicator) 4.6 miles N G. Food Products Quadrant 1 171 Valley View, Seneca IL 5.2 miles NE Quadrant 1 281 E. Lincoln, Seneca IL 5.1 miles NE Quadrant 2 106 W. Thomas, Ransom, IL 6.0 miles S Quadrant 2 205 W. Plumb, Ransom IL 5.3 miles S Quadrant 3 1814 E. 25th Rd., Ransom IL 3.5miles SW Quadrant 4 2507 N. 2553 Rd., Marseilles IL 4.3 miles NNW Control Biros Farm 14.2 miles E H. Vegetation L-Veg C Control 9.5 miles ENE L-ESE 1 Indicator 1.5 miles ESE L-ESE 2 Indicator 6.0 miles ESE B-1

TABLE B-1 : Radiological Environmental Monitoring Program - Sampling Locations.

Distance and Direction, LaSalle County Station, 2019 Location Location Description Distance & Direction From Site I. Environmental Dosimetry - OSLO Inner Ring L-101-1 and -2 0.5 miles N L-102-1 and -2 0.6 miles NNE L-103-1 and -2 0.7 miles NE L-104-1 and -2 0.8 miles ENE L-105-1 and-2 0.7 miles E L-106-1 and -2 1.4 miles ESE L-107-1 and -2 0.8 miles SE L-108-1 and -2 0.5 miles SSE L-109-1 and -2 0.6 miles S L-110-1 and-2 0.6 miles SSW L-111b-1 and-2 0.8miles SW L-112-1 and -2 0.9milesWSW L-113a-1 and -2 0.8milesW L-114-1 and -2 0.9milesWNW L- 115-1 and-2 0.7milesNW L-116-1 and -2 0.6 miles NNW Outer Ring L-201-3 and -4 4.0 miles N L-202-3 and -4 3.6 miles NNE L-203-1 and -2 4.0 miles NE L-204-1 and -2 3.2 miles ENE L-205-1 and -2 3.2 miles ESE L-205-3 and -4 5.1 miles E L-206-1 and -2 4.3 miles SE L-207-1 and -2 4.5 miles SSE L-208-1 and -2 4.5 miles S L-209-1 and -2 4.0miles SSW L-210-1 and-2 3.3 miles SW L-211-1 and -2 4.5milesWSW L-212-1 and -2 4.0 milesW L-213-3 and -4 4.9 milesW L-214-3 and -4 5.1 miles WNW L-215-3 and -4 5.0 miles NW L-216-3 and -4 5.0 miles NNW L-01-1 and -2 Nearsite 1 (indicator) 1.5milesNNW L-03-1 and -2 Onsite 3 (indicator) 1.0 miles ENE L-04-1 and -2 Rte. 170 (indicator) 3.2 miles E L-05-1 and -2 Onsite 5 (indicator) 0.3 miles ESE L-06-1 and -2 Nearsite 6 (indicator) 0.4milesW L-07-1 and -2 Seneca (indicator) 5.2 miles NNE L-08-1 and -2 Marseilles (indicator) 6.0 miles NNW L-11A-1 and -2 Ransom (indicator) 6.0 miles S Control and Soecial Interest L-10-1 and -2 Streator 13.5 miles SW B-2

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, LaSalle County Station, 2019 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Gamma Monthly composite from TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Water Spectroscopy weekly grab samples.

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

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

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

Water Spectroscopy Ground/Well TBE, TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation Tritium Quarterly grab samples.

Water Semi-annual samples Gamma TBE-2007 Gamma-Emitting Radioisotope Analysis Fish collected via electroshocking Spectroscopy or other techniques Gamma Semi-annual TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Sediment Spectroscopy grab samples One-week composite of Air TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices Gross Beta continuous air sampling Particulates through glass fiber filter paper Air Gamma Quarterly composite of each TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Particulates Spectroscopy station Bi-weekly composite of Gamma 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 Bi-weekly grab sample when Gamma Milk cows are on pasture. TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Spectroscopy Monthly all other times Food Gamma TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Annual grab samples.

Products Spectroscopy Gamma Monthly grab samples during TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Vegetation Spectroscopy growing season Optically Quarterly OSLDs comprised Stimulated OSLO of two Al20J:C Landauer Landauer Incorporated Luminescence Incorporated elements.

Dosimetry B-3

. .. . ' / .' C* *'

. I B-4

Figure 8-2 Outer Ring OSLO Locations and Fixed Air Sampling Locations of the LaSalle County Station, 2019 B-5

Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of the LaSalle County Station. 2019 B-6

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, 2019 RES ULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD L-21 L-40 01/03/19 - 01/24/19 5.2 +/- 2.1 6.5 +/- 2.2 02/06/19 - 02/28/19 5.1 +/- 2.2 5.1 +/- 2.2 03/06/19 - 03/27/19 6.8 +/- 2.3 6.1 +/- 2.2 04/04/19 - 04/25/19 6.0 +/- 2.2 7.3 +/- 2.3 05/01/19 - 05/30/19 7.5 +/- 2.6 6.9 +/- 2.5 06/05/19 - 06/26/19 4.3 +/- 2.1 4.0 +/- 2.1 07/02/19 - 07/31/19 3.6 +/- 1.9 5.2 +/- 2.1 08/08/19 - 08/29/19 9.8 +/- 2.6 8.6 +/- 2.6 09/04/19 - 09/26/19 6.1 +/- 2.0 6.9+/-2.1 10/02/19 - 10/31/19 5.6 +/- 2.1 6.4 +/- 2.1 11106/19 - 11/29/19 7.7 +/- 2.3 8.5 +/- 2.4 12/05/19 - 12/26/19 7.6 +/- 2.4 10.0 +/- 2.5 (1) MEAN :I: 2 STD DEV 6.3 +/- 3.4 6.8 +/- 3.3 Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD L-21 L-40 01/03/19 - 03/27/19 < 200 < 193 04/04/19 - 06/26/19 397 +/- 140 523 +/- 139 07/02/19 - 09/26/19 265 +/- 125 321 +/- 125 10/02/19 - 12/26/19 341 +/- 130 305 +/- 131 (1) MEAN+/- 2 STD DEV 334 +/- 133 383 +/- 243 (1) THE MEAN AND 7WO STANDARD DEV/A TION 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, 2019 RESULTS IN UNITS OF PCl/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 01/03/19 - 01/24/19 < 2 < 2 < 5 < 2 < 3 <2 < 3 < 12 < 2 < 1 < 18 <6 02106/19 - 02128/19 < 2 < 2 < 5 < 2 <4 < 3 <4 < 9 < 2 < 2 < 19 <7 03/06/19 - 03/27/19 < 2 < 2 <4 <2 <4 < 2 <4 < 7 < 2 < 2 < 15 < 5 04/04/19 - 04/25/19 < 3 < 3 <6 < 3 < 6 < 3 < 5 < 11 < 3 < 3 < 22 < 8 05/01 /19 - 05/30/19 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 9 < 2 < 2 < 16 < 5 06/05/19 - 06/26/19 < 1 <2 <4 < 2 < 3 < 2 < 3 < 9 <2 < 2 < 16 < 5 07/02119 - 07/31/19 <2 <2 < 4 < 2 < 3 <2 < 3 < 10 <2 < 2 < 17 < 5 08/08/19 - 08/29/19 <2 <2 <4 < 2 < 3 <2 < 3 < 7 <2 < 2 < 14 < 5 09/04/19 - 09/26/19 <2 <2 <4 < 2 < 3 <2 < 3 <6 <2 < 2 < 12 <4 10/02119 - 10/31/19 <2 < 2 <4 < 2 < 3 <2 < 3 < 9 < 2 < 2 < 16 < 5 11/06/19 - 11/29/19 < 2 < 2 <4 < 2 <4 <2 < 3 < 7 < 2 < 2 < 15 < 6 12105/19 - 12126/19 < 1 < 2 <4 < 2 < 3 < 2 < 3 < 6 < 2 < 2 < 12 <4 MEAN 9

I\)

L-40 01/03/19 - 01/24/19 <2 < 2 < 5 < 2 <4 < 2 < 3 < 12 <2 < 2 < 19 <7 02114/19 - 02/28/19 < 3 < 3 < 6 < 3 < 6 < 3 < 5 < 10 < 3 < 3 < 20 < 6 03/14/19 - 03/27/19 <4 < 5 < 11 <4 < 10 < 5 < 8 < 14 <4 <4 < 26 < 9 04/04/19 - 04/25/19 < 3 < 3 < 6 < 3 < 6 < 3 < 5 < 11 < 3 < 3 < 22 < 8 05/01/19 - 05/30/19 <2 < 2 <4 < 2 < 3 <2 < 3 < 9 <2 < 2 < 16 < 6 06/05/19 - 06/26/19 < 1 < 2 <4 < 2 < 3 < 2 < 3 < 8 < 2 < 2 < 15 < 5 07/02/19 - 07/31/19 < 1 < 2 <4 < 1 < 3 < 2 < 3 < 9 < 2 < 1 < 16 < 6 08/08/19 - 08/29/19 < 2 < 2 <4 < 2 <4 < 2 < 3 < 7 < 2 < 2 < 14 < 5 09/04/19 - 09/26/19 < 2 < 2 <4 < 2 <4 < 2 < 3 < 7 < 2 <2 < 14 < 5 10/02/19 - 10/31/19 < 1 <2 < 4 < 2 < 3 < 2 < 3 < 9 < 2 < 2 < 15 < 5 11/06/19 - 11/29/19 <2 <2 < 5 < 2 <4 <2 <4 < 7 <2 < 2 < 15 < 5 12105/19 - 12126/19 < 1 < 1 < 3 < 1 < 3 < 2 < 3 < 5 < 1 < 1 < 10 < 3 MEAN

Table C-11.1 CONCENTRATIONS OF TRITIUM IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RES ULTS IN UNITS OF PC I/LITER +/- 2 SIGMA COLLECTION PERIOD L-27 L-28-W4 L-28-W5 L-28-W6 01/09119 - 01/09/19 < 190 < 190 < 189 04/10/19 - 04/10/19 < 188 < 187 < 183 07/10/19 - 07/10/19 < 199 < 195 < 193 10/09/19 - 10/09/19 < 195 < 188 < 192 MEAN C-3

Table C-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/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 01/09/19 - 01/09/19 < 8 < 8 < 12 <6 < 13 < 8 < 12 < 8 < 7 < 29 < 12 04/10/19 - 04/10/19 < 3 <4 < 9 < 5 < 9 < 5 <7 <4 <4 < 16 < 8 07/10/19 - 07/10/19 <4 <4 < 10 <4 < 9 < 5 <8 <5 <4 < 24 < 8 10/09/19 - 10/09/19 < 8 < 7 < 15 < 11 < 13 < 9 < 12 <9 < 8 < 33 < 12 MEAN L-28-W4 04/10/19 - 04/10/19 <4 <3 <7 < 5 < 8 <4 <7 < 5 < 4 < 20 <6 10/09/19 - 10/09/19 < 6 <6 < 16 <7 < 13 < 9 < 11 < 7 < 8 < 31 < 12 MEAN L-28-W5 01/09/19 - 01/09/19 < 5 < 5 < 10 <6 < 10 <6 < 9 < 7 < 6 < 29 < 8 07/10/19 - 07/10/19 <4 <4 < 8 < 3 <7 <4 <7 <4 < 3 < 23 < 6 0 MEAN J:.

L-28-W6 01/09/19 - 01/09/19 < 7 <6 < 11 <7 < 12 < 8 < 11 <6 < 6 < 28 < 11 04/10/19 - 04/10/19 <4 <4 < 9 < 5 < 8 <4 <6 <4 < 4 < 20 <6 07/10/19 - 07/10/19 <4 <4 <8 <4 < 9 <4 < 7 < 5 < 4 < 20 < 9 10/09/19 - 10/09/19 <7 <7 < 13 < 8 < 15 < 9 < 12 < 8 < 8 < 37 < 12 MEAN

Table C-111.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/KG WET +/- 2 SIGMA COLLECTION

-SITE L-34 PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Common Carp 05/23/19 < 52 < 58 < 132 < 48 < 102 < 62 < 105 < 50 < 65 < 435 < 170 Largemouth Bass 05123/19 < 66 < 58 < 128 < 53 < 138 < 67 < 111 < 83 < 56 < 387 < 129 Bluegill 10/15/19 < 45 < 47 < 89 < 53 < 99 < 50 < 94 < 49 < 45 < 234 < 77 Common Carp 10/15/19 < 85 < 77 < 159 < 80 < 187 < 85 < 151 < 87 < 82 < 407 < 116 MEAN L-35 Channel Catfish 05123/19 < 40 < 46 < 101 < 53 < 76 < 46 < 73 < 36 < 35 < 292 < 92 Freshwater Drum 05123119 < 69 < 77 < 140 < 80 < 148 < 95 < 119 < 84 < 83 < 508 < 137 Freshwater Drum 10/16/19 < 54 < 55 < 101 < 48 < 120 < 52 < 88 < 56 < 52 < 230 < 72 Smallmouth Bass 10116119 < 41 < 40 < 136 < 40 < 92 < 49 < 82 < 50 < 41 < 158 < 64 0 MEAN en L-36 Freshwater Drum 05/23119 < 59 < 63 < 146 < 62 < 145 < 63 < 105 < 72 < 57 < 394 < 106 Smallmouth Buffalo 05/23119 < 53 < 57 < 132 < 70 < 98 < 67 < 104 < 56 < 48 < 326 < 128 Freshwater Drum 10/16/19 < 41 < 45 < 105 < 41 < 91 < 48 < 80 < 49 < 45 < 175 < 57 4 Smallmouth Buffalo 10116119 < 52 < 54 < 107 < 66 < 103 < 62 < 92 < 56 < 57 < 215 < 75 MEAN

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/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 06/11/19 < 69 < 66 < 151 < 73 < 168 < 79 < 114 < 85 < 88 < 315 < 109 10/15/19 < 133 < 96 < 232 < 77 < 235 < 124 < 155 < 134 < 140 < 493 < 140 MEAN L-40 05/29/19 < 101 < 117 < 288 < 117 < 216 < 120 < 224 < 113 < 115 < 673 < 254 10/15/19 < 95 < 85 < 176 < 104 < 145 < 101 < 172 < 109 < 109 < 389 < 153 MEAN L-41 06/11/19 < 39 < 37 < 89 < 37 < 87 < 36 < 62 < 39 < 41 < 194 < 61 10/15/19 < 62 < 48 < 127 < 61 < 106 < 63 < 98 < 69 < 66 < 266 < 101 0I MEAN O>

(1) THE MEAN AND 7WO STANDARD DEV/A TION ARE CALCULATED USING THE POSITIVE VALUES (VALUES 2: MDC)

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF E-3 PCl/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 01/03/19 - 01/09/19 24 +/- 5 22 +/-5 25 +/- 5 25 +/- 5 25 +/- 5 25 +/- 5 25 +/- 5 23 +/- 5 26 +/- 5 01/09/19 - 01/17/19 20 +/- 4 111 13 +/-4 15 +/- 4 14 +/- 4 14 +/- 4 13 +/- 4 16 +/- 4 17 +/- 4 13 +/- 4 01/17/19 - 01/24/19 36 +/- 10111 14 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 15 +/-4 01/24/19 - 02/01/19 (1) 23 +/- 4 24 +/- 5111 21 +/- 4 23 +/- 4 27 +/- 4 36 +/- 5111 25 +/- 4 22 +/-4 02/01/19 - 02/06/19 24 +/- 4111 15 +/- 5 13 +/- 5 17 +/- 5 18 +/- 6 17 +/- 5 19 +/- 5 17 +/- 5 14 +/- 5 02/06/19 - 02/14/19 13 +/-4 14 +/- 4 11 +/- 3 11 +/- 3 13 +/- 3 11 +/- 3 13 +/- 4111 12 +/- 4111 12 +/- 3 02/14/19 - 02/21/19 16 +/-4 15 +/- 4 14 +/- 4 14 +/- 4 16 +/- 4 10 +/- 4 18 +/- 5 15 +/- 4 15 +/-4 02/21/19 - 02/28/19 20 +/-4 23 +/- 5 22 +/- 4 20 +/- 4 23 +/- 4 21 +/- 4 22 +/- 4 23 +/- 4 22 +/- 4 02/28/19 - 03/06/19 15 +/-4 17 +/- 4 19 +/- 4 20 +/- 4 17 +/- 4 17 +/- 4 18 +/- 4 17 +/- 4 19 +/- 4 03/06/19 - 03/14/19 15 +/- 4 20 +/-4 17 +/- 4 19 +/- 4 (1) 17 +/- 4 18 +/- 4 18 +/- 4 16 +/- 4 03/14/19 - 03/21/19 15 +/- 4 14 +/-4 14 +/- 4 10 +/- 3 16 +/- 10111 12 +/- 3 12 +/- 3 13 +/- 4 12 +/- 4 03/21/19 - 03/27/19 6 +/-4 6 +/-4 8+/-4 7+/-4 6+/-3 <5 6+/-4 8+/-4 6 +/-4 03/27/19 - 04/04/19 17 +/- 4 17 +/- 4 16 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 17 +/- 4 17 +/- 4 18 +/-4 04/04/19 - 04/10/19 12 +/- 4 10 +/- 4 15 +/- 4 13 +/- 4 8+/-4 9+/-4 11 +/- 4 11 +/- 4 12 +/- 4 04/10/19 - 04/18/19 5 +/-3 5 +/-3 6 +/-3 6+/-3 7+/-3 8+/-4 8+/-4 8+/- 4 8 +/- 3 04/18/19 - 04/25/19 11 +/- 4 12 +/- 4 12 +/- 4 14 +/- 4 8+/-3 11+/-3 13 +/- 4 8 +/- 3 11 +/- 4 04/25/19 - 05/01/19 10 +/- 4 10 +/- 4 10 +/- 4 13 +/- 4 14 +/- 4 9 +/-4 9+/-4 12 +/- 4 10 +/- 4 05/01/19 - 05/09/19 13 +/- 3 13 +/- 4 10 +/- 3 12 +/- 3 9+/-3 11+/-3 14 +/- 4 12 +/- 4 12 +/- 3 05/09/19 - 05/16/19 11 +/- 4 9+/-4 9+/-4 11 +/- 4 11+/-4 13+/-4 10 +/- 4 9 +/-4 8 +/- 4 05/16/19 - 05/23/19 6+/-3 9 +/-3 8 +/-3 8+/-3 8+/-3 8+/-3 7 +/-3 14 +/- 4 8 +/- 3 05/23/19 - 05/30/19 11 +/- 3 11 +/- 3 9 +/-3 11 +/- 3 7 +/-3 12 +/- 3 10 +/- 3 7+/-3 10 +/- 3 05/30/ 19 - 06/05/ 19 12 +/- 4 12 +/- 4 12 +/- 4 10 +/- 4 10 +/- 4 8 +/-4 11 +/- 4 11 +/- 4 8 +/-4 06/05/19 - 06/13/19 16 +/- 4 15 +/- 4 18 +/- 4 17 +/- 4 14 +/- 4 14 +/- 4 17 +/- 4 13 +/- 4 15 +/- 4 06/13/19 - 06/20/19 10 +/- 4 10 +/- 4 11 +/- 4 10 +/- 4 9 +/- 4 14 +/- 4 12 +/- 4 9+/-4 14 +/- 4 06/20/19 - 06/26/19 16 +/- 5 8 +/-4 12 +/- 4 11 +/- 4 14 +/- 5 13 +/- 4 12 +/- 4 11 +/- 4 9 +/- 4 06/26/19 - 07/02/19 28 +/- 6 23 +/- 5 25 +/- 5 21 +/- 5 23 +/- 5 17 +/- 5 18 +/- 5 22 +/- 5 20 +/- 5 07/02/19 - 07/10/19 13 +/- 4 14 +/- 4 11 +/- 4 14 +/- 4 16 +/- 4 10 +/- 4 12 +/- 4 11 +/- 4 14 +/- 4 07/10/19 - 07/17/19 13 +/- 4 13 +/- 4 10 +/- 4 16 +/- 4 13 +/- 4 16 +/- 4 13 +/- 4 12 +/- 4 15 +/- 4 07/17119 - 07/24/19 8+/-3 6+/-3 9+/-4 8+/-3 11+/-4 11+/-4 10 +/- 4 7+/-3 9 +/- 4 07/24/19 - 07/31/19 16 +/- 4 15 +/- 4 16 +/- 4 20 +/- 5 17 +/- 4 19 +/- 5 17 +/- 4 17 +/- 4 16 +/- 4 07/31/19 - 08/08/19 15 +/- 4 17 +/- 4 17 +/- 4 18 +/- 4 15 +/- 4 15 +/- 4 20 +/- 4 18 +/- 4 15 +/- 4 08/08/19 - 08/15/19 16 +/- 4 16 +/- 4 14 +/- 4 15 +/- 4 17 +/- 4 14 +/- 4 19 +/- 4 15 +/- 4 19 +/- 4 08/15/19 - 08/22/19 19 +/- 4 15 +/- 4 23 +/- 5lll 20 +/- 4 23 +/- 4 19 +/- 4 20 +/- 4 19 +/- 4 21 +/- 4 08/22/19 - 08/29/19 14 +/- 4 10 +/- 3 11 +/-4 11 +/- 4 13 +/- 4 14 +/- 4 15 +/- 4 13 +/- 4 13 +/- 4 08/29/19 - 09/04/19 22 +/- 5 17 +/- 4 21 +/- 5 26 +/- 5 26 +/- 5 20 +/- 5 24 +/- 5 21 +/- 5 21 +/- 5 09/04/19 - 09/12/19 16 +/- 4 20 +/- 4 21 +/- 4 17 +/- 4 19 +/- 4 16 +/- 4 24 +/- 4 22 +/- 4 19 +/- 4 09/12/19 - 09/19/19 24 +/- 5 24 +/- 5 28 +/- 5 23 +/- 5 23 +/- 5 23 +/- 5 30 +/- 5 19 +/- 4 26 +/- 5 09/19/19 - 09/26/19 20 +/- 5 22 +/- 4 23 +/-5 23 +/- 5 19 +/- 4 21 +/- 5 22 +/- 5 22 +/- 5 24 +/- 5 09/26/19 - 10/02/19 12 +/- 4 12 +/- 4 15 +/-4 13 +/- 4 16 +/- 5 15 +/- 5 12 +/- 4 17 +/- 5 16 +/- 4 10/02/19 - 10/09/19 13 +/- 4 13 +/- 4 14 +/- 4 14 +/- 4 14 +/- 4 15 +/- 4 13 +/- 4 15 +/- 4 16 +/- 4 10/09/19 - 10/17/19 14 +/- 4 16 +/- 4 17 +/- 4 17 +/- 4 14 +/- 4 16 +/- 4 16 +/- 4 16 +/- 4 16 +/- 4 10/17/19 - 10/23/19 18 +/- 5 22 +/- 5 19 +/-5 17 +/- 5 18 +/- 5 20 +/- 5 15 +/- 5 19 +/- 5 20 +/- 5 10/23/19 - 10/31/19 14 +/- 4 15 +/- 4 14 +/- 4 16 +/- 4 111 10 +/- 3 18 +/- 4 12 +/- 3 16 +/- 4 12 +/- 3 10/31/19 - 11/06/19 19 +/- 5 17 +/- 4 14 +/- 4 20 +/- 5111 12 +/- 4 15 +/- 4 15 +/- 4 15 +/- 5 16 +/- 4 11/06/19 - 11/14/19 15 +/- 4 15 +/- 4 16 +/- 4 29 +/- 4111 16 +/- 4 14 +/- 4 15 +/- 4 14 +/- 4 18 +/- 4 11/14/19 - 11/21/19 16 +/- 4 19 +/- 4 20 +/- 4 15 +/-4 20 +/- 4 19 +/- 4 25 +/- 5 21 +/- 5 22 +/- 4 11/21/19 - 11/29/19 12 +/- 3 13 +/- 3 14 +/-3 14 +/- 3 15 +/- 4 13 +/- 3 19 +/- 4 15 +/- 4 16 +/- 4 11 /29/19 - 12/05/19 14 +/- 4 11 +/- 4 15 +/-4 16 +/- 4 16 +/- 4 15 +/- 4 10 +/- 4 14 +/- 4 12 +/- 4 12/05/19 - 12/12/19 22 +/- 5 24 +/- 5 25 +/- 5 24 +/-5 24 +/- 5 27 +/- 5 23 +/- 5 28 +/- 5 22 +/- 4 12/12/19 - 12/19/19 25 +/- 5 24 +/- 5 30 +/- 5 32 +/-5 27 +/- 5 26 +/- 5 26 +/- 5 28 +/- 5 23 +/- 4 12/19/19 - 12/26/19 27 +/- 5 21 +/- 5 25 +/-5 27 +/-5 27 +/- 5 34 +/- 5 28 +/- 5 28 +/- 5 29 +/- 5 12/26/19 - 01102/20 23 +/- 4 25 +/- 4 26 +/-5 25 +/- 5 22+/-4 23+/-4 23 +/- 5 24 +/- 4 22 +/- 4 (2) MEAN+/- 2 STD DEV 16 +/- 12 15 +/- 10 16 +/- 12 16 +/- 11 16+/-11 16+/-11 17 +/- 12 16 +/- 11 16 +/- 11 (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, 2019 RESULTS IN UNITS OF E-3 PCl/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 MIN MAX MEAN+/- COLLECTION MIN MAX MEAN +/- COLLECTION MIN MAX MEAN+/-

PERIOD 2SD PERIOD 2SD PERIOD 2SD PERIOD 2SD 01/03/19 - 02106/19 13 36 22 +/- 14 01/03/19 - 02/01/19 14 25 19 +/- 10 01/03/19 - 02/01/19 13 36 21 +/- 12 01/03/19 - 02/01/19 13 26 19 +/- 12 02101/19 - 02128/19 13 23 16 +/- 7 02/01 /19 - 02/28/19 11 22 15 +/- 8 02/01 /19 - 02/28/19 10 23 17 +/- 8 02/01/19 - 02/28/19 12 22 16 +/- 8 02128/19 - 04/04/19 6 20 14 +/- 10 02128/19 - 04/04/19 7 20 15 +/- 10 02128/19 - 04/04/19 6 18 14 +/- 8 02/28/19 - 04/04/19 6 19 14 +/- 10 04/04/19 - 05/01/19 5 12 9 +/- 5 04/04/19 - 05/01/19 6 15 11 +/- 7 04/04/19 - 05/01 /19 7 14 10 +/- 4 04/04/19 - 05/01 /19 8 12 10 +/- 4 05/01/19 - 05/30/19 6 13 10 +/- 5 05/01 /19 - 05/30/19 8 12 10 +/- 3 05/01/19 - 05/30/19 7 14 10 +/- 5 05/01 /19 - 05/30/19 8 12 10 +/- 4 05/30/19 - 07/02119 8 28 15 +/- 12 05/30/19 - 07/02/19 10 25 15 +/- 11 05/30/19 - 07/02/19 8 23 14 +/- 8 05/30/19 - 07102/19 8 20 13 +/- 10 07/02119 - 07/31/19 6 16 12 +/- 7 07/02/19 - 07/31/19 8 20 13 +/- 8 07/02/19 - 07/31/19 7 19 13 +/- 7 07/02/19 - 07/31/19 9 16 13 +/- 5 07/31/19 - 08/29/19 10 19 15 +/- 6 07/31/19 - 08/29/19 11 23 16 +/- 9 07/31/19 - 08/29/19 13 23 17 +/- 6 07/31/19 - 08/29/19 13 21 17 +/- 7 08/29/19 - 10/02119 12 24 19 +/- 9 08/29/19 - 10/02/19 13 28 21 +/- 10 08/29/19 - 10/02119 12 30 20 +/- 8 08/29/19 - 10/02119 16 26 21 +/- 8 10/02119 - 10/31/19 13 22 16 +/- 6 10/02119 - 10/31/19 14 19 16 +/- 3 10/02/19 - 10/31/19 10 20 16 +/- 5 10/02/19 - 10/31/19 12 20 16 +/- 7 10/31/19 - 11/29/19 12 19 16 +/- 5 10/31/19 - 11/29/19 14 29 18 +/- 10 10/31/19 - 11/29/19 12 25 16 +/- 7 10/31/19 - 11/29/19 16 22 18 +/- 5 11/29/19 - 01/02120 11 27 21 +/- 11 11/29/19 - 01/02120 15 32 24 +/- 11 11/29/19 - 01/02120 10 34 24 +/- 12 11 /29/19 - 01 /02120 12 29 22 +/- 12 0I co 01/03/19 - 01/02/20 5 36 16 +/- 11 01/03/19 - 01/02120 6 32 16 +/- 12 01/03/19 - 01/02120 6 36 16 +/- 11 01/03/19 - 01/02120 6 29 16 +/- 11

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF E-3 PCl/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 01/03/19 - 04/04/19 < 3 < 5 < 15 <3 <8 <4 <8 < 3 < 3 < 309 < 131 04/04/19 - 07/02/19 <2 <4 <8 <2 <4 <4 < 3 < 3 <2 < 228 < 103 07/02/19 - 10/02/19 <3 <4 <8 <3 < 8 < 3 <7 < 3 <3 < 190 < 95 10/02/19 - 01/02/20 < 1 < 3 <7 < 1 <4 <2 <4 < 1 < 1 < 83 < 42 MEAN L-03 01 /03/19 - 04/04/19 < 2 <3 < 11 <2 <6 < 3 <6 < 3 <2 < 154 < 62 04/04/19 - 07/02/19 <2 <4 < 10 < 3 < 7 <4 < 8 < 3 <2 < 227 < 139 07/02/19 - 10/02/19 <2 < 3 < 8 < 3 < 3 < 3 <6 < 2 <2 < 133 < 58 10/02/19 - 01/02/20 < 3 <4 < 11 <2 < 6 <5 < 6 < 2 < 2 < 183 < 76 MEAN

(') L-04 01/03/19 - 04/04/19 < 2 <5 < 11 <2 <8 <4 <7 < 3 < 2 < 236 < 65 I

U) 04/04/19 - 07/02/19 < 3 <7 < 15 <3 < 8 <6 < 12 <4 < 3 < 346 < 85 07/02/19 - 10/02/19 < 2 < 3 < 9 <2 < 5 < 3 < 5 <2 < 2 < 152 < 76 10/02/19 - 01/02/20 < 3 <4 < 11 <2 <6 <4 <6 <2 < 2 < 172 < 69 MEAN L-05 01/03/19 - 04/04/19 <2 <4 < 10 < 1 < 5 <4 <6 <2 < 1 < 169 < 56 04/04/19 - 07/02/19 < 3 <4 <4 < 2 <4 <5 <6 <2 < 2 < 199 < 96 07/02/19 - 10/02/19 < 3 < 3 < 11 < 3 <6 < 5 <8 <3 < 3 < 198 < 75 10/02/19 - 01/02/20 <4 < 5 < 17 < 3 < 8 <6 < 10 <4 < 3 < 211 < 85 MEAN L-06 01/03/19 - 04/04/19 < 3 < 3 < 12 <2 < 6 <3 <7 < 2 < 2 < 196 < 73 04/04/19 - 07/02/19 < 1 <4 < 11 < 3 < 7 <5 <6 < 2 < 2 < 245 < 80 07/02/19 - 10/02/19 < 3 <4 < 10 < 2 < 8 <4 <6 < 2 < 2 < 217 < 74 10/02/19 - 01 /02/20 < 2 <4 < 8 <2 < 5 <4 <5 < 2 < 2 < 165 < 81 MEAN

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF E-3 PCl/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 01/03/19 - 04/04/19 < 2 <4 < 12 <2 <7 <4 < 9 < 3 < 2 < 183 < 62 04/04/19 - 07/02/19 < 3 < 3 < 12 <2 < 5 < 3 <7 < 3 < 2 < 213 < 54 07/02/19 - 10/02/19 < 2 < 3 < 9 <2 < 5 <4 <6 < 2 < 2 < 123 < 69 10/02119 - 01 /02/20 < 2 < 3 < 9 <2 < 5 < 3 <4 < 2 < 2 < 131 < 91 MEAN L-08 01/03/19 - 04/04/19 < 3 < 5 < 16 < 2 < 6 <5 < 7 < 3 < 3 < 217 < 113 04/04/19 - 07/02/19 < 3 < 3 < 11 < 1 <6 <4 <7 <2 <2 < 201 < 106 07/02/19 - 10/02/19 <2 < 2 < 7 < 2 < 5 < 3 < 5 <2 <2 < 114 < 57 10/02119 - 01/02/20 < 3 <4 < 11 < 3 <7 <3 < 7 <2 < 3 < 210 < 84 MEAN 0I

..II. L-10 01/03/19 - 04/04/19 < 2 <4 < 16 <2 <7 <4 < 9 < 3 < 3 < 281 < 90 0 04/04/19 - 07/02119 < 3 < 5 < 15 < 3 < 8 <6 <9 < 3 < 3 < 345 < 119 07/02/19 - 10/02/19 < 2 <4 < 11 < 3 <6 <4 <6 < 2 < 2 < 167 < 79 10/02/19 - 01/02/20 < 2 <4 < 8 <2 <6 <4 <6 < 2 < 2 < 188 < 64 MEAN L-11A 01/03/19 - 04/04/19 <2 < 3 < 10 < 1 < 3 <4 <6 <3 < 2 < 224 < 41 04/04/19 - 07/02/19 <2 < 3 < 13 < 2 <4 <4 < 7 < 3 < 2 < 209 < 112 07/02119 - 10/02119 < 3 <4 < 11 < 3 < 5 < 3 < 5 <2 < 2 < 122 < 44 10/02/19 - 01/02/20 <4 < 5 < 16 <4 < 9 < 6 < 11 <4 < 3 < 290 < 119 MEAN

Table C-Vl.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF E-3 PCl/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 01/03/19 - 01/09/19 < 67 < 66 < 64 < 38 < 64 < 47 < 47 < 46 < 48 01/09/19 - 01/17/19 < 68l'J < 60 < 61 < 34 < 62 < 43 < 43 < 43 < 44 01/17/19 - 01/24/19 < 59llJ < 38 < 38 < 37 < 37 < 47 < 48 < 48 < 47 01/24/19 - 02/01/19 (1) < 37 < 41ll} < 35 < 36 < 33 < 51\l} < 35 < 35 02/01/19 - 02/06/19 < 52l'J < 59 < 51 < 58 < 62 < 64 < 60 < 63 < 65 02106/19 - 02/14/19 < 40 < 41 < 40 < 23 < 33 < 55 < 68ll} < 58\l} < 54 02114/19 - 02/21/19 < 43 < 44 < 43 < 31 < 45 < 37 < 40 < 40 < 38 02/21/19 - 02/28/19 < 47 < 48 < 47 < 37 < 46 < 45 < 46 < 45 < 46 02/28/19 - 03/06/19 < 61 < 62 < 52 < 42 < 61 < 53 < 54 < 52 < 52 03/06/19 - 03/14/19 < 63 < 63 < 25 < 62 (1) < 65 < 66 < 65 < 66 03/14/19 - 03/21/19 < 22 < 23 < 23 < 22 < 68l'J < 31 < 32 < 27 < 33 03/21/19 - 03/27/19 < 59 < 59 < 60 < 59 < 24 < 51 < 51 < 53 < 51 03/27/19 - 04/04/19 < 44 < 45 < 36 < 43 < 42 < 58 < 59 < 59 < 57 04/04/19 - 04/10/19 < 42 < 43 < 18 < 41 < 42 < 26 < 26 < 27 < 26 04/10/19 - 04/18/19 < 56 < 56 < 57 < 41 < 23 < 42 < 43 < 41 < 34 04/18/19 - 04/25/19 < 21 < 22 < 22 < 34 < 22 < 14 < 35 < 37 < 35 04/25/19 - 05/01 /19 < 33 < 34 < 14 < 32 < 33 < 26 < 27 < 25 < 24 05/01/19 - 05/09/19 < 53 < 56 < 54 < 39 < 53 < 40 < 41 < 42 < 34 05/09/19 - 05/16/19 < 40 < 41 < 35 < 39 < 40 < 59 < 61 < 64 < 60 05/16/19 - 05/23/19 < 36 < 35 < 36 < 15 < 35 < 23 < 24 < 23 < 19 05/23/19 - 05/30/19 < 20 < 21 < 21 < 18 < 20 < 28 < 29 < 12 < 28 05/30/19 - 06/05/19 < 61 < 62 < 27 < 63 < 62 < 41 < 43 < 44 < 42 06/05/19 - 06/13/19 < 41 < 40 < 42 < 38 < 40 < 15 < 38 < 38 < 37 06/13/19 - 06/20/19 < 21 < 21 < 18 < 21 < 21 < 29 < 28 < 12 < 27 06/20/19 - 06/26/19 < 39 < 38 < 40 < 45 < 40 < 47 < 45 < 38 < 44 06/26/19 - 07/02/19 < 27 < 26 < 26 < 27 < 11 < 21 < 21 < 21 < 21 07/02/19 - 07/10/19 < 23 (1) < 23 < 27 < 23 < 28 < 28 < 28 < 11 07/10/19 - 07/17/19 < 37 < 43 < 42 < 42 < 42 < 51 < 49 < 50 < 49 07/17/19 - 07/24/19 < 32 < 31 < 32 < 34 < 32 < 34 < 35 < 30 < 33 07/24/19 - 07/31/19 < 22 < 21 < 22 < 34 < 21 < 36 < 35 < 15 < 33 07/31/19 - 08/08/19 < 35 < 34 < 35 < 35 < 28 < 33 < 33 < 34 < 32 08/08/19 - 08/15/19 < 37 < 38 < 38 < 38 < 31 < 21 < 21 < 21 < 20 08/15/19 - 08/22119 < 37 < 34 < 31ll} < 37 < 35 < 52 < 51 < 52 < 49 08/22/19 - 08/29/19 < 31 < 30 < 31 < 13 < 30 < 23 < 22 < 23 < 22 08/29/19 - 09/04/19 < 55 < 54 < 55 < 46 < 55 < 40 < 47 < 47 < 45 09/04/19 - 09/12119 < 36 < 35 < 36 < 34 < 35 < 35 < 33 < 36 < 14 09/12/19 - 09/19/19 < 21 < 21 < 21 < 27 < 21 < 27 < 27 < 27 < 11 09/19/19 - 09/26/19 < 20 < 8 < 20 < 20 < 20 < 45 < 44 < 45 < 43 09/26/19 - 10/02/19 < 52 < 51 < 54 < 55 < 48 < 28 < 28 < 28 < 27 10/02119 - 10/09/19 < 21 < 21 < 21 < 21 < 9 < 26 < 26 < 26 < 24 10/09/19 - 10/17/19 < 38 < 15 < 38 < 39 < 38 < 29 < 29 < 30 < 28 10/17/19 - 10/23/19 < 60 < 58 < 60 < 44 < 61 < 44 < 44 < 45 < 35 10/23/19 - 10/31/19 < 29 < 29 < 28 < 18l'J < 28 < 20 < 20 < 21 < 18 10/31/19 - 11/06/19 < 36 < 28 < 38 < 34ll} < 38 < 47 < 47 < 49 < 47 11/06/19 - 11/14/19 < 12 < 12 < 12 < 17l'J < 12 < 35 < 35 < 37 < 34 11/14/19 - 11/21/19 < 44 < 44 < 44 < 33 < 45 < 33 < 33 < 34 < 26 11/21/19 - 11/29/19 < 43 < 42 < 43 < 35 < 43 < 44 < 44 < 46 < 43 11/29/19 - 12/05/19 < 65 < 64 < 66 < 49 < 29 < 50 < 50 < 53 < 42 12105/19 - 12/12/19 < 36 < 35 < 35 < 54 < 34 . < 54 < 54 < 57 < 21 12/12/19 - 12/19/19 < 61 < 59 < 60 < 48 < 60 < 50 < 50 < 44 < 47 12/19/19 - 12/26/19 < 54 < 23 < 53 < 55 < 55 < 31 < 36 < 36 < 35 12/26/19 - 01/02/20 < 37 < 36 < 38 < 32 < 38 < 44 < 46 < 43 < 43 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-11

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION CONTROL FARM PERIOD L-42 01/03/19 < 0.5 02/06/19 < 0.9 03/06/19 < 0.8 04/04/19 < 0.7 05/01/19 < 0.8 05/16/19 < 0.4 05/30/19 < 0.8 06/13/19 < 0.9 06/26/19 < 0.9 07/10/19 < 0.8 07/24/19 < 0.5 08/08/19 < 0.8 08/22/19 < 0.5 09/04/19 < 0.9 09/19/19 (1) 10/02/19 (1) 10/17/19 (1) 10/31/19 (1) 11/14/19 (1) 12/05/19 < 0.6 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-12

Table C-Vll.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/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-42 01/03/19 <7 < 8 < 16 < 8 < 17 < 8 <9 <7 <7 < 35 < 8 02/06/19 < 7 <7 < 14 < 8 < 18 < 8 < 14 < 9 <8 < 37 < 9 03/06/19 < 5 < 6 < 13 <6 < 11 < 5 < 10 < 6 <6 < 20 < 7 04/04/19 < 8 < 9 < 21 <9 < 14 < 9 < 14 < 9 <8 < 37 < 11 05/01/19 <6 <6 < 14 < 5 < 14 < 7 < 11 < 6 <6 < 32 < 8 05/16/19 <8 < 9 < 18 < 11 < 17 < 8 < 14 < 9 <8 < 40 < 10 05/30/19 <8 < 8 < 15 < 10 < 17 < 9 < 12 < 7 < 8 < 37 < 12 06/13/19 < 5 < 5 < 13 < 7 < 13 <6 < 10 <6 <6 < 24 < 6 06/26/19 < 7 < 8 < 13 < 7 < 17 <8 < 11 < 8 < 8 < 35 < 13 07/10/19 < 8 <9 < 16 < 9 < 19 <8 < 14 < 7 < 8 < 43 < 7 07/24/19 < 8 <7 < 19 <7 < 20 <7 < 14 <8 <7 < 30 < 9 08/08/19 < 10 <8 < 19 < 9 < 16 < 8 < 14 < 10 <9 < 37 < 9 0I

..a. 08/22/19 < 8 <8 < 13 < 9 < 19 < 7 < 14 < 10 <9 < 33 < 13

(,I) 09/04/19 <8 <9 < 21 < 10 < 18 < 8 < 13 < 9 <9 < 36 < 11 09/19/19 (1) 10/02119 (1) 10/17/19 (1) 10/31/19 (1) 11/14/19 (1) 12/05/19 < 9 < 10 < 24 < 12 < 20 <9 < 17 <9 <9 < 39 < 14 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-Vlll.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/KG WET+/- 2 SIGMA COLLECTION SITE L-QUAD 1 Broccoli PERIOD 07/31/19 Mn-54

< 32 Co-58

< 35 Fe-59

< 80 Co-60

< 34 Zn-65

< 94 Nb-95

< 35 Zr-95

< 64 1-131

< 52 Cs-134

< 37 Cs-137

< 33 Ba-140

< 166 La-140

< 44 Onions 07/31/19 < 24 < 23 < 50 < 27 < 49 < 23 < 41 < 37 < 26 < 24 < 108 < 36 Red beets 08/08/19 < 13 < 13 < 25 < 13 < 27 < 14 < 22 < 21 < 14 < 14 < 62 < 16 MEAN L-QUAD 2 Red cabbage 08/08/19 < 34 < 33 < 78 < 35 < 81 < 28 < 66 < 51 < 43 < 41 < 153 < 30 Horseradish Root 08/15/19 < 33 < 31 < 65 < 36 < 78 < 30 < 60 < 47 < 38 < 30 < 142 < 34 Potatoes 08/22/19 < 37 < 34 < 82 < 37 < 71 < 42 < 65 < 53 < 43 < 44 < 154 < 42 MEAN L-QUAD 3

(') Zucchini 08/29/19 < 14 < 15 < 36 < 13 < 39 < 17 < 28 < 28 < 18 < 15 < 69 < 20 I

~

~ MEAN L-QUAD4 Cabbage 07/02/19 < 26 < 24 < 53 < 21 < 58 < 21 < 37 < 39 < 28 < 24 < 134 < 29 Green onions 07/02/19 < 29 < 26 < 54 < 22 < 67 < 32 < 49 < 56 < 30 < 24 < 151 < 44 CatTOts 07/24/19 < 34 < 34 < 64 < 47 < 74 < 26 < 55 < 43 < 25 < 35 < 147 < 48 MEAN

Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/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 Clover 05123119 < 12 < 13 < 31 < 12 < 27 < 14 < 23 < 54 < 13 < 12 < 103 < 31 Grass 05123119 < 15 < 16 < 38 < 18 < 33 < 17 < 30 < 57 < 16 < 15 < 124 < 36 Milkweed 05123119 < 14 < 14 < 32 < 12 < 31 < 16 < 25 < 56 < 15 < 13 < 120 < 30 Milkweed 06120119 < 47 < 38 < 78 < 52 < 103 < 41 < 75 < 57 < 47 < 57 < 192 < 41 Clover 06120119 < 34 < 24 < 60 < 40 < 69 < 31 < 53 < 46 < 34 < 29 < 127 < 36 Yellow Sweet Clover 06120119 < 27 < 26 < 52 < 27 < 51 < 26 < 45 < 42 < 29 < 28 < 127 < 29 Grass 07117119 < 23 < 29 < 64 < 29 < 67 < 29 < 47 < 37 < 28 < 32 < 130 < 40 Yellow Sweet Clover/Red Clover 07117119 < 36 < 36 < 66 < 34 < 87 < 36 < 60 < 50 < 38 < 30 < 147 < 51 Yellow Mullein 07117119 < 14 < 13 < 28 < 14 < 27 < 15 < 24 < 23 < 15 < 15 < 62 < 19 Clover 08115119 < 24 < 24 < 48 < 26 < 46 < 25 < 39 < 36 < 26 < 25 < 107 < 33 Grass 08115119 < 29 < 29 < 59 < 31 < 62 < 30 < 51 < 43 < 32 < 30 < 134 < 35 Milkweed 08115119 < 18 < 17 < 38 < 19 < 38 < 17 < 29 < 25 < 19 < 18 < 75 < 21 Clover 09126119 < 19 < 19 < 41 < 21 < 44 < 20 < 35 < 32 < 22 < 20 < 87 < 27 Grass 09126119 < 32 < 29 < 61 < 37 < 68 < 34 < 52 < 46 < 35 < 33 < 135 < 41 Milkweed 09126119 < 41 < 43 < 103 < 45 < 112 < 50 < 81 < 56 < 41 < 44 < 172 < 39 Clover 10117119 < 24 < 23 < 48 < 24 < 57 < 24 < 41 < 37 < 25 < 25 < 105 < 28 Dock Plant 10117119 < 20 < 20 < 40 < 21 < 42 < 21 < 35 < 29 < 22 < 21 < 92 < 26 Milkweed 10117119 < 24 < 23 < 47 < 23 < 53 < 23 < 41 < 35 < 26 < 25 < 105 < 30 MEAN L-ESE-1 Dandelion 05123119 < 12 < 15 < 32 < 14 < 31 < 14 < 25 < 56 < 14 < 12 < 103 < 30 0I Grass 05123119 < 18 < 18 < 41 < 19 < 37 < 18 < 31 < 47 < 20 < 18 < 111 < 34

..... Dandelion 06120119 < 31 < 28 < 55 < 41 < 67 < 29 < 52 < 47 < 36 < 34 < 126 < 34 (J'I Grass 06120119 < 32 < 30 < 64 < 36 < 77 < 35 < 51 < 51 < 38 < 31 < 154 < 36 Bulrush 07117119 < 12 < 13 < 26 < 13 < 27 < 13 < 22 < 21 < 14 < 13 < 58 < 16 Grass 07117119 < 35 < 35 < 69 < 18 < 63 < 31 < 44 < 52 < 36 < 35 < 147 < 45 Dandelions 08115119 < 26 < 25 < 47 < 25 < 53 < 27 < 42 < 38 < 27 < 27 < 112 < 30 Grass 08115119 < 25 < 25 < 51 < 31 < 58 < 28 < 46 < 36 < 27 < 29 < 109 < 35 Dandelion 09/26119 < 34 < 29 < 66 < 33 < 79 < 36 < 48 < 48 < 39 < 37 < 146 < 50 Grass 09126119 < 18 < 17 < 39 < 20 < 39 < 18 < 31 < 28 < 20 < 18 < 83 < 26 Clover 10/17/19 < 19 < 19 < 40 < 21 < 40 < 19 < 32 < 28 < 21 < 20 < 82 < 26 Dandelions 10117119 < 37 < 36 < 88 < 45 < 87 < 36 < 61 < 51 < 39 < 40 < 165 < 45 MEAN L-ESE-2 Dandelion 05123119 < 13 < 15 < 37 < 17 < 32 < 14 < 26 < 55 < 15 < 14 < 119 < 32 Field Pennygrass 05123119 < 15 < 16 < 37 < 16 < 35 < 17 < 27 < 38 < 18 < 16 < 95 < 26 Grass 05123119 < 14 < 16 < 35 < 14 < 33 < 15 < 25 < 58 < 15 < 14 < 125 < 38 Clover 06120119 < 34 < 32 < 70 < 34 < 70 < 37 < 59 < 53 < 36 < 35 < 151 < 49 Grass 06120119 < 30 < 31 < 63 < 33 < 72 < 33 < 48 < 48 < 35 < 34 < 144 < 46 Common Tansy/Plantain 07117119 < 29 < 25 < 63 < 29 < 61 < 26 < 65 < 55 < 34 < 35 < 161 < 36 Grass 07117/19 < 12 < 11 < 26 < 13 < 25 < 12 < 20 < 20 < 13 < 12 < 53 < 13 Red Clover 07/17119 < 11 < 11 < 26 < 12 < 26 < 12 < 21 < 20 < 13 < 13 < 55 < 12 Clover 08115119 < 28 < 27 < 54 < 24 < 51 < 29 < 49 < 47 < 31 < 32 < 130 < 36 Plantain 08115119 < 25 < 26 < 50 < 24 < 51 < 27 < 46 < 39 < 27 < 26 < 122 < 34 clover 09126119 < 45 < 42 < 81 < 45 < 95 < 48 < 72 < 55 < 40 < 38 < 166 < 64 dandelion 09/26/19 < 36 < 37 < 76 < 36 < 65 < 37 < 69 < 54 < 47 < 38 < 173 < 44 plantain 09126119 < 38 < 37 < 87 < 40 < 82 < 46 < 65 < 58 < 44 < 41 < 183 < 56 Dandelions 10/17/19 < 32 < 27 < 66 < 36 < 63 < 33 < 55 < 45 < 35 < 30 < 130 < 41 Dock plant 10117119 < 18 < 19 < 40 < 20 < 41 < 20 < 34 < 28 < 22 < 20 < 82 < 24 Plantain 10117119 < 19 < 18 < 40 < 23 < 39 < 18 < 31 < 25 < 21 < 20 < 81 < 24 MEAN

Table C-IX.1 QUARTERLY DLR RESULTS FOR LASALLE COUNTY STATION, 2019 Annual Location Annual 2019 Normalized Net Dose, MQx Normalized Facility Qtrly BQ+ BA+ Facility Location (mrem/std. Qtr.) Annual Dose, BA(1) Dose, Baseline, MDDQ MDDA12) Dose, FA MA (mrem/yr) FA >10 BQ (mrem) (mrem) 1 I 2 I 3 I 4 mrem L-01 13.3 22.0 10.7 15.9 21.6 20.6 68.8 53.1 87.3 ND No L-03 11.9 20.6 10.7 14.6 19.1 17.6 61.9 45.3 79.5 ND No L-04 12 20.7 11.9 15.3 19.3 20.1 66.6 45.6 79.8 ND No L-05 11.7 20.4 10.4 15.8 19.5 20.4 66.0 46.8 81.0 ND No L-06 13.2 21.9 11.4 16.1 19.5 19.4 66.3 53.0 87.2 ND No L-07 12.9 21.6 11.2 15.6 20.0 20.7 67.5 51.5 85.7 ND No L-08 12.5 21.2 10.9 15.1 18.6 19.4 64.0 50.1 84.3 ND No L-10 10 18.7 8.9 13.1 17.8 17.6 57.3 39.8 74.0 ND No L-101 13.3 22.0 11.3 16.1 20.3 21.3 69.0 50.4 84.6 ND No L-102 14.9 23.6 13.0 14.9 25.0 23.8 76.7 59.5 93.7 ND No L-103 12.3 21.0 12.6 15.3 20.6 20.3 68.8 49.2 83.4 ND No L-104 11.6 20.3 10.6 15.7 19.2 18.8 64.2 46.3 80.5 ND No L-105 13.3 22.0 11.2 15.9 21.7 21.7 70.5 53.2 87.4 ND No L-106 12.3 21.0 11.0 15.3 20.3 20.4 67.1 49.2 83.4 ND No L-107 12.8 21.5 11.3 16.7 22.7 21.6 72.3 51.2 85.4 ND No L-108 11.1 19.8 11.9 16.1 22.6 22.0 72.6 44.3 78.5 ND No L-109 12.9 21.6 11.1 16.5 20.2 19.7 67.4 51.6 85.8 ND No L-110 12.4 21.1 12.2 13.3 21.3 21.0 67.8 49.7 83.9 ND No L-1118 13.1 21.8 11.6 15.7 21.6 21.3 70.1 52.3 86.5 ND No L-112 12.4 21.1 9.8 14.4 19.8 21.0 64.9 49.6 83.8 ND No L-113A 13.8 22.5 12.5 16.7 23.3 22.6 75.1 55.2 89.4 ND No L-114 13.1 21.8 12.2 16.0 21.4 20.9 70.5 50.0 84.2 ND No L-115 11.2 19.9 11.8 15.3 21.5 19.2 67.8 44.8 79.0 ND No L-116 11.2 19.9 10.2 14.2 18.4 20.1 62.8 44.8 79.0 ND No L-11A 10.3 19.0 9.3 6.0 20.4 6.4 42.2 41.2 75.4 ND No L-201 11 19.7 7.0 12.7 16.3 17.1 53.2 43.8 78.0 ND No L-202 10.2 18.9 7.8 13.0 18.0 18.5 57.3 40.9 75.1 ND No L-203 12.8 21.5 10.6 16.3 20.6 21.0 68.5 51.1 85.3 ND No L-204 13.3 22.0 11.8 16.2 22.4 21.1 71.6 50.7 84.9 ND No L-205 12.2 20.9 10.8 17.1 20.8 20.2 68.8 48.8 83.0 ND No L-205 12 20.7 9.5 16.1 19.7 19.6 65.0 45.7 79.9 ND No L-206 12.9 21.6 12.2 17.0 22.3 19.4 70.9 51.6 85.8 ND No L-207 12.1 20.8 11.3 15.4 19.7 20.0 66.4 48.5 82.7 ND No L-208 13.1 21.8 11.1 16.7 21.1 20.6 69.5 44.6 78.8 ND No L-209 12.4 21.1 11.6 17.0 21.5 20.0 70.1 47.2 81.4 ND No L-210 13.7 22.4 12.1 18.3 23.1 20.8 74.2 51.9 86.1 ND No L-211 13.5 22.2 11.8 17.1 21.2 22.4 72.5 54.1 88.3 ND No L-212 13.3 22.0 12.0 17.3 21.0 21.0 71.3 50.5 84.7 ND No L-213 11.5 20.2 10.2 15.2 20.2 19.9 65.5 41.6 75.8 ND No L-214 11.9 20.6 11.8 16.9 20.1 19.1 67.9 47.6 81.8 ND No L-215 13.6 22.3 12.1 17.0 21.2 22.3 72.6 54.4 88.6 ND No L-216 13.4 22.1 12.1 16.4 21.1 20.6 70.3 53.5 87.7 ND No 1

< 1 Baseline background dose (BBiJ: 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 (MDDiJ: 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 C-16

FIGURE C-1 Surface Water - Gross Beta - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2019 L-21 (C) Illinois River at Seneca 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 -------------'----------1 01-27-05 01-18-10 01-09-15 12-31-19 L-40 Illinois River Downstream 12.0 10.0 8.0

...I 5 6.0 CL 4.0 2.0 0.0 " " - - - - - - - - - - - - - - - - - - - - <

01-27-05 01-18-10 01-09-15 12-31-19 C-17

FIGURE C-2 Surface Water - Tritium - Stations L-21 (C) and L-40 Collected in the Vicinity of LSCS, 2005 - 2019 L-21 Illinois River at Seneca 2000 1600 1200 800 400 O+-~~~-+-~~~~~~~~+--~~~~

03-31-05 12-07-08 08-15-12 04-23-16 12-31-19 L-40 Illinois River Downstream 2000 1600 1200 s

(.)

Q.

800 400 0

03-31-05 12-07-08 08-15-12 04-23-16 12-31-19 C-18

FIGURE C-3 Air Particulate - Gross Beta - Stations L-01 and L-03 Collected in the Vicinity of LSCS, 2005 - 2019 L-01 Nearsite No. 1 60.0 50.0

.., 40.0

§

<6.

.., 30.0 9

~ 20.0 10.0 0.0 +-- - -- - - - - - - - - - -----1 01-04-20 01-06-05 10-06-08 07-06-12 04-05-16 L-03 Onsite No. 3 60.0 50.0

.., 40.0

§ CJ ll. 30.0 9

w 20.0

....0 10.0 0.0 01-06-05 10-06-08 07-06-12 04-05-16 01-04-20 C-19

FIGURE C-4 Air Particulate - Gross Beta - Stations L-05 and L-06 Collected in the Vicinity of LSCS, 2005 - 2019 L-05 Onsite No. 5 60.0 50.0 40.0

.e M

~

M 30.0 9

l!l 20.0 10.0 0.0 _ _ _ _ _ _ _ _ _ _ _ _ _ _ ____.._ _

01-06-05 10-06-08 07-06-12 04-05-16 01-04-20 L-06 Nearsite No. 6 70.0 60.0 50.0 M

~ 40.0 u

CL M

9 30.0 w

0

..... 20.0 10.0 0.0 01-06-05 10-06-08 07-06-12 04-05-16 01-04-20 C-20

FIGURE C-5 Air Particulate - Gross Beta - Station L-1 O (C)

Collected in the Vicinity of LSCS, 2005 - 2019 L-10 (C) Streator 60.0 50.0 M 40.0

.E 0

a. 30.0 M

Cj'

~ 20.0 10.0 0.0 ---------------11----

01-06-05 10-06-08 07-06-12 04-05-16 01-04-20 C-21

FIGURE C-6 Air Particulate - Gross Beta - Stations L-04 and L-07 Collected in the Vicinity of LSCS, 2005 - 2019 L-04 Rte. 170 60.0 50.0 C') 40.0

~

<6.

C')

30.0 9

....~ 20.0 10.0 0.0 -----------t-----------t 07-07-05 02-19-09 10-04-12 05-19-16 01-02-20 L-07 Seneca 60.0 50.0 C')

40.0

~

0 Q. 30.0 C')

9 w 20.0 0

10.0 0.0 07-07-05 02-19-09 10-04-12 05-19-16 01-02-20 C-22

FIGURE C-7 Air Particulate - Gross Beta - Stations L-08 and L-11 Collected in the Vicinity of LSCS, 2005 - 2019 L-08 Marseilles 60.0 50.0 M 40.0

~

0

a. 30.0 M

0 I

w 20.0 0

10.0 0.0 07-07-05 02-19-09 10-04-12 05-19-16 01-02-20 L-11 Ransom (1) 60.0 50.0 M 40.0

.E 0a.

30.0 M

C?

w 20.0 0

10.0 0.0 07-07-05 01-14-09 07-24-12 02-01-16 (1) Air monitoring station L-11 was retired on 01121116 C-23

FIGURE C-8 Air Particulate - Gross Beta - Station L-11A Collected in the Vicinity of LSCS, 2016 - 2019 L-11A Ransom (1) 40.0 30.0 C')

~

'6.

C') 20.0 ~

~

~ 10.0 0.0 + - - - - - - - + - - - - - - - + - - - - - - - +

01-07-16 05-06-17 09-03-18 01-01-20 (1) Air monitoring station L-11A was placed in service on 01114116 C-24

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledyne Brown Engineering Environmental Services TBE Identification Known Ratio of TBE to MonthNear Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) Analytics Result Value March 2019 E12468A Milk Sr-89 pCi/L 87.1 96 0.91 A Sr-90 pCi/L 12.6 12.6 1.00 A E12469A Milk Ce-141 pCi/L 113 117 0.97 A Co-58 pCi/L 153 143 1.07 A Co-60 pCi/L 289 299 0.97 A Cr-51 pCi/L 233 293 0.80 A Cs-134 pCi/L 147 160 0.92 A Cs-137 pCi/L 193 196 0.98 A Fe-59 pCi/L 153 159 0.96 A 1-131 pCi/L 91.5 89.5 1.02 A Mn-54 pCi/L 149 143 1.04 A Zn-65 pCi/L 209 220 0.95 A E12470 Charcoal 1-131 pCi 77.5 75.2 1.03 A E12471 AP Ce-141 pCi 60.7 70.2 0.87 A Co-58 pCi 87.9 85.8 1.02 A Co-60 pCi 175 179 0.98 A Cr-51 pCi 165 176 0.94 A Cs-134 pCi 91.2 95.9 0.95 A Cs-137 pCi 120 118 1.02 A Fe-59 pCi 108 95.3 1.13 A Mn-54 pCi 94.2 85.7 1.10 A Zn-65 pCi 102 132 0.77 w E12472 Water Fe-55 pCi/L 2230 1920 1.16 A E12473 Soil Ce-141 pCi/g 0.189 0.183 1.03 A Co-58 pCi/g 0.209 0.224 0.93 A Co-60 pCi/g 0.481 0.466 1.03 A Cr-51 pCi/g 0.522 0.457 1.14 A Cs-134 pCi/g 0.218 0.250 0.87 A Cs-137 pCi/g 0.370 0.381 0.97 A Fe-59 pCi/g 0.263 0.248 1.06 A Mn-54 pCi/g 0.248 0.223 1.11 A Zn-65 pCi/g 0.371 0.344 1.08 A E12474 AP Sr-89 pCi 88.3 95.2 0.93 A Sr-90 pCi 11.7 12.5 0.94 A August 2019 E12562 Soil Sr-90 pCi/g 4.710 6.710 0.70 w (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< O. 70 and> 1.30 (Page 1 of 2)

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Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledyne Brown Engineering Environmental Services TBE Identification Known Ratio ofTBE to Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Analytics Result Value September 2019 E12475 Milk Sr-89 pCi/L 70.0 93.9 0.75 w Sr-90 pCi/L 12.0 12.9 0.93 A E12476 Milk Ce-141 pCi/L 150 167 0.90 A Co-58 pCi/L 170 175 0.97 A Co-60 pCi/L 211 211 1.00 A Cr-51 pCi/L 323 331 0.98 A Cs-134 pCi/L 180 207 0.87 A Cs-137 pCi/L 147 151 0.97 A Fe-59 pCi/L 156 148 1.05 A 1-131 pCi/L 81 .1 92.1 0.88 A Mn-54 pCi/L 160 154 1.04 A Zn-65 pCi/L 303 293 1.03 A E12477 Charcoal 1-131 pCi 95.9 95.1 1.01 A E12478 AP Ce-141 pCi 129 138 0.93 A Co-58 pCi 128 145 0.88 A Co-60 pCi 181 174 1.04 A Cr-51 pCi 292 274 1.07 A Cs-134 pCi 166 171 0.97 A Cs-137 pCi 115 125 0.92 A Fe-59 pCi 119 123 0.97 A Mn-54 pCi 129 128 1.01 A Zn-65 pCi 230 242 0.95 A E12479 Water Fe-55 pCi/L 1810 1850 0.98 A E12480 Soil Ce-141 pCi/g 0.305 0.276 1.10 A Co-58 pCi/g 0.270 0.289 0.93 A Co-60 pCi/g 0.358 0.348 1.03 A Cr-51 pCi/g 0.765 0.547 1.40 N(1l Cs-134 pCi/g 0.327 0.343 0.95 A Cs-137 pCi/g 0.308 0.321 0.96 A Fe-59 pCi/g 0.257 0.245 1.05 A Mn-54 pCi/g 0.274 0.255 1.07 A Zn-65 pCi/g 0.536 0.485 1.11 A E12481 AP Sr-89 pCi 95.9 91 .9 1.04 A Sr-90 pCi 12.3 12.6 0.97 A E12563 Soil Sr-90 pCi/g 0.392 0.360 1.09 A (a) The Analytics known value is equal to 100% of the parameter pre.sent in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limfts:

A = Acceptable - reported result falls within ratio limfts of O. 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 limfts of< 0. 70 and> 1.30 (1) See NCR 19-27

{Page 2 of 2)

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

Table D.2 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Range Value February 2019 19-GrF40 AP Gross Alpha Sq/sample 0.184 0.528 0.158 - 0.898 A Gross Beta Sq/sample 0.785 0.948 0.474 -1.422 A 19-MaS40 Soil Ni-63 Bq/kg 420 519.0 363 - 675 A Sr-90 Bq/kg (1) NR(3l 19-MaW40 Water Am-241 Bq/L 0.764 0.582 0.407 - 0. 757 N(4J Ni-63 Bq/L 4.72 5.8 4.1-7.5 A Pu-238 Bq/L 0.443 0.451 0.316 - 0.586 A Pu-239/240 Bq/L -0.00161 0.0045 (2) A 19-RdF40 AP U-234/233 Sq/sample 0.1138 0.106 0.074 - 0.138 A U-238 Sq/sample 0.107 0.110 0.077 - 0.143 A 19-RdV40 Vegetation Cs-134 Sq/sample 2.14 2.44 1.71-3.17 A Cs-137 Sq/sample 2.22 2.30 1.61 - 2.99 A Co-57 Sq/sample 2.16 2.07 1.45 - 2.69 A Co-60 Sq/sample 0.02382 (1) A Mn-54 Sq/sample -0.03607 (1) A Sr-90 Sq/sample -0.1060 (1) Nl5J Zn-65 Sq/sample 1.35 1.71 1.20 - 2.22 w August 2019 19-GrF41 AP Gross Alpha Sq/sample 0.192 0.528 0.158- 0.898 w Gross Beta Sq/sample 0.722 0.937 0.469 - 1.406 A 19-MaS41 Soil Ni-63 Bq/kg 436 629 440 - 818 N(BJ Sr-90 Bq/kg 444 572 400- 744 w 19-MaW41 Water Am-241 Bq/L NR(7 l Ni-63 Bq/L 7.28 9.7 6.8 - 12.6 w Pu-238 Bq/L 0.0207 0.0063 (2) A Pu-239/240 Bq/L 0.741 0.727 0.509 - 0.945 A 19-RdF41 AP U-234/233 Sq/sample 0.0966 0.093 0.065 - 0.121 A U-238 Sq/sample 0.0852 0.096 0.067-0.125 A 19-RdV41 Vegetation Cs-134 Sq/sample 0.0197 (1) A Cs-137 Sq/sample 3.21 3.28 2.30 - 4.26 A Co-57 Sq/sample 4.62 4.57 3.20 - 5.94 A Co-60 Sq/sample 4.88 5.30 3.71 - 6.89 A Mn-54 Sq/sample 4.54 4.49 3.14 - 5.84 A Sr-90 Sq/sample 0.889 1.00 0.70-1.30 A Zn-65 Sq/sample 2.78 2.85 2.00 - 3.71 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 of0.80-1.20 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 NR = Not Reported (1) False positive test (2) Sensitivity evaluation (3) NR (Not Reported) See NCR 19-12 (4) See NCR 19-13 (5) See NCR 19-14 (6) See NCR 19-25 (7) NR (Not Reported) See NCR 19-26 (Page 1 of 1) 0-3

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation <bl Number Value<aJ Limits Value April 2019 Rad-117 Water Ba-133 pCi/L 26.3 24.1 18.6 - 27.8 A Cs-134 pCi/L 15.2 12.1 8.39 - 14.4 N<1i Cs-137 pCi/L 33.6 33.1 28.8- 39.4 A Co-60 pCi/L 11.9 11.5 8.67 -15.5 A Zn-65 pCi/L 87.1 89.2 80.3 -107 A GR-A pCi/L 19 19.3 9.56- 26.5 A GR-B pCi/L 20.2 29.9 19.1 - 37.7 A U-Nat pCi/L 55.5 55.9 45.6- 61.5 A H-3 pCi/L 21500 21400 18700 - 23500 A Sr-89 pCi/L 44.9 33.3 24.5-40.1 N<2i Sr-90 pCi/L 24.5 26.3 19.0 - 30.7 A 1-131 pCi/L 28.9 28.4 23.6- 33.3 A October 2019 Rad-119 Water Ba-133 pCi/L 42.7 43.8 35.7 - 48.8 A Cs-134 pCi/L 53.5 55.9 45.2 - 61.5 A Cs-137 pCi/L 77.7 78.7 70.8- 89.2 A Co-60 pCi/L 51.5 53.4 48.1 - 61.3 A Zn-65 pCi/L 36.6 34.0 28.5 -43.1 A GR-A pCi/L 40.5 27.6 14.0 - 36.3 N<JJ GR-B pCi/L 36.3 39.8 26.4-47.3 A U-Nat pCi/L 27.66 28.0 22.6- 31.1 A H-3 pCi/L 22800 23400 20500 - 25700 A Sr-89 pCi/L 47.1 45.5 35.4 - 52.7 A Sr-90 pCi/L 32.5 26.5 19.2 - 30.9 N(4J 1-131 pCi/L 26.0 23.9 19.8 - 28.4 A December 2019 QR 1204190 Water Sr-90 pCi/L 20.1 18.6 13.2 - 22.1 A (a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(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 19-10 (2) See NCR 19-11 (3) See NCR 19-23 (4) See NCR 19-24 (Page 1 of 1)

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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 ......................................................... 5 3.2. Liquid Effluent Pathways ....................................................................... 5 3.3. Assessment of Dose to Member of Public ............................................ 5 4.0. SITE METEOROLOGY .................................................................................... 6 E-1

Table of Contents (cont.)

APPENDIX E-1 DATA TABLES AND FIGURES ............................................................. E-1.1 Station Releases Table 1.1-1 Gaseous Effluents Summation of all Releases ............................ E-1.2 Table 1.2-1 Summation of all Liquid Releases ................................................ E-1.3 Table 2.1-1 Solid Radwaste Annual Report (2017) ......................................... E-1.4 Table 3.1-1 Maximum Doses Resulting from Gaseous Releases and Compliance Status ...................................................................... E-1.5 Table 3.2-1 Maximum Doses Resulting from Liquid Releases and Compliance Status ...................................................................... E-1.6 Table 3.3-1 Maximum Doses Resulting from Releases and Compliance Status ....................................................................... E-1.7 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data ............................................. E-1.8 ii E-2

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.

1 E-3

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 1.BOE-03 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.

2 E-4

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 2.95E+02 curies of fission and activation gases were released with an average release rate of 9.36E+OO µCi/sec.

A total of 2.19E-02 curies of 1-131 were released during the year with an average release rate of 7.00E-04 µCi/sec.

A total of 9.55E-03 curies of beta-gamma emitters were released as airborne particulate matter with an average release rate of 3.03E-04 µCi/sec. Alpha-emitting radionuclides were below the lower limit of detection (LLD). Carbon-14 released in 2019 was calculated separately with a total of 3.48E+01 curies released with an average release rate of 1.1 OE+OO µCi/sec.

A total of 7.15E+01 curies of tritium were released with an average release rate of 2.28E+OO µCi/sec.

1.2 Liquids Released to Illinois River There were no liquid batch releases in 2019. 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 2019 Annual Radioactive Effluent Release Report (ARERR). This report was submitted to the USN RC by the required date of May 1st, 2020.

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 3

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Station are reported as Unit 1 releases due to a single station vent stack (SVS) release point. Offsite Gamma air and whole body dose rates are shown in Table 3.1-1 and were calculated based on measured release rates, isotopic composition of the noble gases and average meteorological data for the period. Doses based on concurrent meteorological data are shown in Table 3.4-1.

Based on measured effluents and meteorological data, the maximum total body dose to an individual would be 1.BOE-03 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 1.61 E-02 mrem (Table 3.4-1) .

The maximum gamma air dose was 2.70E-03 mrad from Table 3.1-1, and the maximum gamma air dose from concurrent meteorological data was 3.54E-04 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/cm 2 and an occupancy factor of 1.0 is used. The skin dose (from beta and gamma radiation) for the year was 3.06E-03 mrem from Table 3.1-1, and the skin dose from concurrent meteorological data was 4.00E-04 mrem (Table 3.4-1).

The maximum offsite beta dose for the year was 1. 77E-04 mrad from Table 3.1-1, and the maximum offsite beta dose from concurrent meteorological data was 1.65E-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 4

E-6

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 1.11 E-01 mrem for the year.

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

3.3 Assessment of Dose to Member of Public During the period January to December 2019, 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 5

E-7

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 99.5% during 2019.

Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1) 6 E-8

APPENDIX E-1 DATA TABLES AND FIGURES

Intentionally left blank Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2019)

UNIT 1 AND UNIT 2 DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES Est. Total A. Fission & Activation Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Error%

1. Total Release Ci 1.06E+02 8.09E+01 4.39E+01 6.37E+01 2.50E+01

2. Average release rate for the period µCi/sec 1.36E+01 1.03E+01 5.52E+OO 8.01E+OO

3. Percent of ODCM limit % * * *

B. Iodine

1. Total Iodine -131 Ci 1.64E-02 1.83E-03 1.90E-03 1.74E-03 1.50E+01 I

2. Average release rate for the period

3. Percent of ODCM limit

µCi/sec 2.11 E-03 2.32E-04 2.39E-04 2.19E-04 C. Particulates

1. Particulates with half-lives > 8 days Ci 3.03E-03 2.27E-03 3.68E-03 5.65E-04 3.50E+01 I

2. Average release rate for the period

3. Percent of ODCM limit

µCi/sec 3.90E-04 2.88E-04 4.62E-04 7.10E-05 D. Tritium

1. Total Release Ci 3.71E+01 1.02E+01 1.07E+01 1.35E+01 1.50E+01 I

2. Average release rate for the period

3. Percent of ODCM limit

µCi/sec 4.78E-OO 1.29E-OO 1.34E-OO 1.?0E-00 E. Gross Alpha

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

2. Average release rate for the period

3. Percent of ODCM limit

µCi/sec

<LLD

<LLD <LLD

<LLD F. Carbon-14

1. Total Release Ci 8.69E+OO 8.69E+OO 8.69E+OO 8.68E+OO

2. Average release rate for the period

3. Percent of ODCM limit

µCi/sec 1.12E+OO 1.11E+OO 1.09E+OO 1.09E+OO

"*"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 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.

E-1-1

Table 1.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2019)

LIQUID RELEASES UNIT 1 AND UNIT 2 SUMMATION OF ALL LIQUID RELEASES Est. Total A. Fission & Activation Products Unit Quarter 1 Quarter2 Quarter 3 Quarter4 Error%

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

2. Average diluted concentration during

µCi/ml <LLD <LLD <LLD <LLD period

3. Percent of applicable limit % . * .

B. Tritium

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

2. Average diluted concentration during

µCi/ml <LLD <LLD <LLD <LLD period

3. Percent of applicable limit % . * .

C. Dissolved & Entrained Gases

1. Total Release Ci <LLD <LLD <LLD <LLD NIA I

2. Average diluted concentration during

µCi/ml <LLD <LLD <LLD <LLD period

3. Percent of applicable limit %

D. Gross Alpha Activity

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

2. Average release rate for the period

3. Percent of ODCM limit

µCi/ml

<LLD <LLD

<LLD <LLD E. Volume of Waste Released (prior to Liters O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO dilution)

F. Volume of Dilution Water Used During Liters O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Period

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

"<" Indicates activity of sample is less than LLD given in µCi/ml E-1-2

Table 2.1-1 LASALLE COUNTY NUCLEAR POWER STATION SOLID WASTE ANNUAL REPORT (2019)

Table 2.1-1 deliberately deleted. For solid waste disposal detail, refer to the LaSalle County Station 2019 Annual Radiological Effluent Release Report (ARERR).

E-1-3

Table 3.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2019)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM GASEOUS RELEASES AND COMPLIANCE STATUS Quarterly 1st % of 2nd %of 3n1 %of 4th % of Annual % of Units Infant Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+OO mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 0.001 NG Total Body 2.50E+OO mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+OO 0.036 NG Skin 7.50E+OO mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 0.020 NNG Organ 7.50E+OO mRem 7.94E-02 1.059 1.05E-02 0.140 1.09E-02 0.146 1.00E-02 0.133 1.50E+01 0.739 Quarterly 1st %of 2nd %of 3n1 % of 4th % of Annual %of Units Child Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+OO mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 0.001 NG Total Body 2.50E+OO mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+OO 0.036 m NG Skin 7.50E+OO mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 0.020 I

~

I NNG Organ 7.50E+OO mRem 3.29E-02 0.439 4.52E-03 0.060 4.71E-03 0.063 4.25E-03 0.057 1.50E+01 0.309 Teenager Quarterly 1st %of 2nd % of 3n1 %of 4th %of Annual %of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+OO mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 0.001 NG Total Body 2.50E+OO mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+OO 0.036 NG Skin 7.50E+OO mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 0.020 NNG Organ 7.50E+OO mRem 1.09E-02 0.146 4.71E-03 0.063 2.39E-03 0.032 1.54E-03 0.021 1.50E+01 0.130 Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Adult Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+OO mRad 8.91E-04 0.018 1.27E-03 0.025 1.71E-04 0.003 3.66E-04 0.007 1.00E+01 0.027 Beta Air 1.00E+01 mRad 6.74E-05 0.001 5.22E-05 0.001 2.27E-05 0.000 3.50E-05 0.000 2.00E+01 0.001 NG Total Body 2.50E+OO mRem 5.95E-04 0.024 8.46E-04 0.034 1.14E-04 0.005 2.45E-04 0.010 5.00E+OO 0.036 NG Skin 7.50E+OO mRem 1.02E-03 0.014 1.42E-03 0.019 2.00E-04 0.003 4.22E-04 0.056 1.50E+01 0.020 NNG Organ 7.50E+OO mRem 1.00E-02 0.133 4.25E-03 0.057 2.lOE-03 0.028 1.32E-03 0.018 1.50E+01 0.118 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 (2019)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM LIQUID RELEASES AND COMPLIANCE STATUS Infant Quarterly 1st % of 2nd %of 3rd % of 4th %of Annual % of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Organ mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Child Quarterly 1st %of 2nd %of 3rd %of 4th % of Annual %of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 m 40CFR141 compliance (nearest public drinking water)

~ Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 U'I mRem Organ O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Quarterly 1st % of 2nd %of 3rd %of 4th % of Annual % of Teenager Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Organ mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Adult Quarterly 1st % of 2nd % of 3rd %of 4th % of Annual % of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Organ mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00

Table 3.3-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2019)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS 10CFR20 / 40CFR190 Compliance 1st 2nd 3rd 4th %

Quarter Quarter Quarter Quarter Annual Annual Annual Dose Dose Dose Dose Dose Limit Limit (mRem) (mRem) (mRem) (mRem) (mRem) (mRem/yr)

Unit 1 40CFR190 Compliance U1 DEx I 1.04E-01 I 1.07E-01 I 9.74E-02 I 9.74E-02 I 1~4-.0-5-E--01~1 25 1.62 10CFR20 Compliance U1 DTot I 1.83E-01 I 1.17E-01 I 1.08E-01 I 1.07E-01 I 5.16E-01 I 100 0.52 40CFR190 Compliance Bone 7.33E-03 7.17E-03 7.21E-03 7.07E-03 2.88E-02 25 0.12 Liver 1.90E-03 1.70E-03 1.74E-03 1.57E-03 6.91E-03 25 0.03 Thyroid 7.94E-02 1.05E-02 1.09E-02 1.00E-02 1.11 E-01 75 0.15 Kidney 1.92E-03 1.68E-03 1.71E-03 1.57E-03 6.88E-03 25 0.03 Lung 1.63E-03 1.63E-03 1.65E-03 1.54E-03 6.44E-03 25 0.03 Gl-LLI 1.67E-03 1.67E-03 1.70E-03 1.54E-03 6.30E-03 25 0.03 Unit2 40CFR190 Compliance U2 DEX I 7.09E-02 I 9.73E-02 I 9.62E-02 I 9.90E-02 I ~l-3.-63-E--0-1~1 25 ..--1-.4-5~

10CFR20 Compliance U2 DTot I 7.09E-02 I 9.73E-02 I 9.62E-02 I 9.90E-02 I I 3.63E-01 I 100 0.36 40CFR190 Compliance Bone O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 Liver O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 Thyroid O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 75 0.00 Kidney O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 Lung O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 Gl-LLI O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 E-1-6

Table 3.4-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2019)

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:

Sector Dose Maximum Value Affected gamma air< 1> 3.540 E-04 mrad East beta air<2> 1.650 E-04 mrad East 3

whole body <> 1.610 E-02 mrem East skin< 4 > 4.000 E-04 mrem East 5

organ <> (infant-thyroid) 4.270 E-01 mrem East-Southeast Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad 0.00 beta air 20.0 mrad 0.00 whole body 5.0 mrem 0.32 skin 15.0 mrem 0.00 organ 15.0 mrem 2.85

<1l Gamma Air Dose - GASPAR II, NUREG-0597 2l Beta Air Dose - GASPAR II, NUREG-0597 3l Whole Body Dose - GASPAR II, NUREG-0597 4l Skin Dose - GASPAR II, NUREG-0597 5

< l Inhalation and Food Pathways Dose - GASPAR II, NUREG-0597 E-1-7

Intentionally left blank APPENDIX F METEOROLOGICAL DATA

Intentionally left blank LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 2 0 0 2 SSW 0 0 0 1 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 1 0 0 1 w 0 0 0 1 0 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 5 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 classea: 7 F-1

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 3 1 0 0 4 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 1 1 0 0 2 ESE 0 0 2 0 0 0 2 SE 0 1 0 0 0 0 1 SSE 0 1 1 0 0 0 2 s 0 0 1 1 0 0 2 SSW 0 0 1 2 0 0 3 SW 0 0 0 0 0 0 0 WSW 0 0 0 4 0 0 4 w 0 0 1 3 0 0 4 WNW 0 0 0 1 0 0 1 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 2 10 14 0 0 26 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 F-2

LaSalle County Generating Station Period of Record: January - March 2019 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 2 1 0 0 3 NNE 0 0 1 1 0 0 2 NE 0 0 0 1 0 0 1 ENE 0 0 0 1 0 0 1 E 0 0 3 1 0 0 4 ESE 0 0 5 0 0 0 5 SE 0 0 0 0 0 0 0 SSE 0 0 3 0 0 0 3 s 0 0 1 0 0 0 1 SSW 0 2 1 0 0 0 3 SW 0 1 0 0 0 0 1 WSW 0 0 0 2 1 0 3 w 0 0 2 5 0 2 9 WNW 0 0 11 4 3 0 18 NW 0 0 1 1 0 0 2 NNW 0 0 0 2 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 3 30 19 4 2 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: 7 F-3

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 20 14 8 3 0 47 NNE 1 19 19 12 2 0 53 NE 0 11 14 9 0 0 34 ENE 0 3 31 27 4 0 65 E 0 10 42 39 10 1 102 ESE 0 10 17 15 6 0 48 SE 0 6 4 3 0 0 13 SSE 1 7 4 5 0 0 17 s 1 1 4 2 1 0 9 SSW 1 2 4 0 1 0 8 SW 0 5 12 3 0 1 21 WSW 0 6 10 18 7 3 44 w 0 6 26 32 16 6 86 WNW 0 10 48 40 27 3 128 NW 1 4 24 14 6 0 49 NNW 1 22 65 45 4 0 137 Variable 0 0 0 0 0 0 0 Total 8 142 338 272 87 14 861 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: 7 F-4

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 32 16 0 0 0 49 NNE 0 12 8 5 0 0 25 NE 1 3 10 8 2 0 24 ENE 0 13 16 9 13 0 51 E 1 14 33 19 2 0 69 ESE 1 13 17 5 8 1 45 SE 4 8 14 11 11 1 49 SSE 1 9 10 14 6 5 45 s 2 6 7 12 10 1 38 SSW 2 4 2 11 5 0 24 SW 2 7 14 11 1 0 35 WSW 0 7 15 37 8 10 77 w 1 8 27 24 37 48 145 WNW 1 18 36 29 15 18 117 NW 1 5 10 4 0 0 20 NNW 0 14 9 3 0 0 26 Variable 0 0 0 0 0 0 0 Total 18 173 244 202 118 84 839 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: 7 F-5

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 8 1 0 0 0 10 NNE 0 0 1 0 0 0 1 NE 0 1 2 0 0 0 3 ENE 1 4 5 3 0 0 13 E 1 4 12 2 0 0 19 ESE 1 4 0 1 0 0 6 SE 0 7 2 4 0 0 13 SSE 0 6 9 4 0 0 19 s 2 5 9 5 0 0 21 SSW 0 6 6 7 0 0 19 SW 0 3 10 11 0 0 24 WSW 2 1 9 4 1 0 17 w 1 11 9 7 4 1 33 WNW 0 12 5 1 1 4 23 NW 1 4 2 0 0 0 7 NNW 1 4 1 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 11 80 83 49 6 5 234 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: 7 F-6

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 4 0 0 0 0 4 SE 0 12 3 0 0 0 15 SSE 0 14 7 0 0 0 21 s 0 5 12 5 0 0 22 SSW 0 2 12 14 0 0 28 SW 0 6 2 2 0 0 10 WSW 0 4 1 0 0 0 5 w 0 5 7 0 0 0 12 WNW 2 3 1 0 0 0 6 NW 1 3 0 0 0 0 4 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 4 60 45 21 0 0 130 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: 7 F-7

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 F-8

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 1 0 1 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 1 0 1 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 7 F-9

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8 - 12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 4 1 0 5 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 4 0 0 0 4 SE 0 0 0 1 0 0 1 SSE 0 0 3 0 0 0 3 s 0 0 0 1 0 0 1 SSW 0 0 0 2 0 0 2 SW 0 0 0 0 0 0 0 WSW 0 0 0 2 2 0 4 w 0 0 0 0 2 0 2 WNW 0 0 0 1 0 1 2 NW 0 0 0 2 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 7 13 5 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: 7 F-10

LaSalle County Generating Station Period of Record: January - March 2019 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 12 30 43 18 13 116 NNE 2 13 18 10 6 10 59 NE 0 7 15 20 17 9 68 ENE 0 5 26 27 27 19 104 E 1 8 23 40 37 12 121 ESE 0 12 33 35 22 17 119 SE 1 3 12 11 1 5 33 SSE 0 5 6 11 4 4 30 s 2 2 3 4 5 7 23 SSW 1 5 5 4 2 3 20 SW 1 7 11 8 6 2 35 WSW 0 2 7 22 22 19 72 w 0 0 13 17 37 59 126 WNW 1 6 23 55 51 60 196 NW 2 11 26 43 29 28 139 NNW 0 10 18 53 23 4 108 Variable 0 0 0 0 0 0 0 Total 11 108 269 403 307 271 1369 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 40 Hours of missing stability measurements in all stability classes: 7 F-11

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 3 4 2 0 11 NNE 0 2 9 8 2 0 21 NE 0 3 7 3 9 0 22 ENE 1 4 4 5 3 0 17 E 0 1 3 11 8 6 29 ESE 1 0 8 7 4 6 26 SE 0 5 15 3 0 10 33 SSE 0 0 5 2 3 20 30 s 0 1 7 17 6 21 52 SSW 0 2 2 3 3 11 21 SW 0 0 4 4 2 16 26 WSW 0 0 3 3 16 8 30 w 2 1 9 9 12 18 51 WNW 0 1 7 23 9 54 94 NW 1 2 11 14 6 4 38 NNW 0 1 3 1 2 0 7 Variable 0 0 0 0 0 0 0 Total 5 25 100 117 87 174 508 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 14 Hours of missing stability measurements in all stability classes: 7 F-12

LaSalle County Generating Station Period of Record: January - March 2019 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 0 0 0 2 NNE 0 0 0 0 2 0 2 NE 0 0 0 0 1 0 1 ENE 1 0 3 0 0 0 4 E 0 1 0 0 0 0 1 ESE 1 1 0 2 3 0 7 SE 1 1 1 9 1 0 13 SSE 0 0 2 14 0 2 18 s 0 0 4 4 2 0 10 SSW 0 1 3 5 11 12 32 SW 0 0 2 3 8 16 29 WSW 0 0 9 2 2 0 13 w 0 0 3 1 3 0 7 WNW 1 1 1 3 5 0 11 NW 0 0 0 9 2 0 11 NNW 1 0 0 2 1 0 4 Variable 0 0 0 0 0 0 0 Total 5 6 29 54 41 30 165 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: 7 F-13

LaSalle County Generating Station Period of Record: January - March 2019 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 1 0 0 1 s 0 0 0 4 4 2 10 SSW 0 0 0 0 0 10 10 SW 0 0 0 0 0 2 2 WSW 0 0 0 1 0 0 1 w 0 0 0 0 1 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 6 5 14 25 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 7 F-14

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 1 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 1 3 2 0 6 SSW 0 0 0 4 3 0 7 SW 0 0 0 0 7 5 12 WSW 0 0 0 0 0 1 1 w 0 0 0 1 0 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 1 9 12 6 28 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-15

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 0 1 3 0 4 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 4 3 0 7 SE 0 0 0 0 0 0 0 SSE 0 0 1 2 0 0 3 s 0 0 1 1 2 0 4 SSW 0 0 2 7 1 0 10 SW 0 0 1 3 1 0 5 WSW 0 0 3 5 0 1 9 w 0 1 2 5 0 0 8 WNW 0 0 2 3 1 0 6 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 12 33 11 1 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: 4 F-16

LaSalle County Generating Station Period of Record: April - June 2019 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 3 6 0 0 9 NNE 0 0 0 2 0 0 2 NE 0 2 2 1 0 0 5 ENE 0 0 2 2 0 0 4 E 0 0 2 12 1 0 15 ESE 0 0 1 1 2 0 4 SE 0 0 0 1 0 0 1 SSE 0 0 1 1 0 0 2 s 0 1 3 3 2 0 9 SSW 0 5 5 5 4 0 19 SW 0 6 7 7 3 1 24 WSW 0 7 5 6 1 0 19 w 0 7 6 6 1 0 20 WNW 0 3 4 1 1 0 9 NW 0 1 4 4 3 0 12 NNW 0 0 2 6 4 0 12 Variable 0 0 0 0 0 0 0 Total 0 32 47 64 22 1 166 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-17

LaSalle County Generating Station Period of Record: April - June 2019 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 4 47 22 19 0 0 92 NNE 3 36 39 10 2 0 90 NE 0 12 48 36 1 1 98 ENE 1 24 31 57 17 15 145 E 1 10 24 37 19 2 93 ESE 1 5 11 4 3 0 24 SE 2 2 10 9 1 0 24 SSE 0 2 4 4 0 1 11 s 1 3 6 5 3 0 18 SSW 2 9 11 25 6 0 53 SW 1 14 26 17 7 1 66 WSW 0 11 17 16 1 1 46 w 2 14 19 23 5 0 63 WNW 2 19 23 21 2 0 67 NW 0 13 26 17 3 0 59 NNW 1 14 42 24 16 2 99 Variable 0 0 0 0 0 0 0 Total 21 235 359 324 86 23 1048 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-18

LaSalle County Generating Station Period of Record: April - June 2019 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 4 13 4 7 0 0 28 NNE 0 8 3 2 0 0 13 NE 3 8 6 0 0 0 17 ENE 1 6 31 7 0 0 45 E 0 22 30 5 1 1 59 ESE 1 9 15 4 2 0 31 SE 0 8 8 4 0 0 20 SSE 5 5 9 7 1 0 27 s 1 4 13 20 1 0 39 SSW 0 10 14 23 1 0 48 SW 0 4 15 20 0 0 39 WSW 1 7 23 23 1 0 55 w 4 6 8 8 0 0 26 WNW 2 8 11 5 0 0 26 NW 1 8 6 1 0 0 16 NNW 3 8 2 0 0 0 13 Variable 0 0 0 0 0 0 0 Total 26 134 198 136 7 1 502 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-19

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 0 0 0 0 3 NNE 0 1 0 0 0 0 1 NE 3 0 0 0 0 0 3 ENE 1 2 1 0 0 0 4 E 0 18 4 0 0 0 22 ESE 7 17 2 0 0 0 26 SE 3 10 4 0 0 0 17 SSE 4 5 9 6 0 0 24 s 1 6 10 8 0 0 25 SSW 0 9 16 10 0 0 35 SW 1 8 15 4 0 0 28 WSW 1 7 20 7 0 0 35 w 1 9 11 0 0 0 21 WNW 1 10 4 0 0 0 15 NW 2 1 0 0 0 0 3 NNW 1 2 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 27 107 96 35 0 0 265 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-20

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 1 0 0 0 0 1 ESE 2 8 0 0 0 0 10 SE 0 5 6 0 0 0 11 SSE 0 3 5 3 0 0 11 s 4 10 3 1 0 0 18 SSW 0 3 15 0 0 0 18 SW 0 9 7 2 0 0 18 WSW 2 9 1 1 0 0 13 w 0 6 1 1 0 0 8 WNW 0 4 1 0 0 0 5 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 8 58 39 8 0 0 113 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements_ in all stability classes: 4 F-21

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-22

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Moderately 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 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 2 1 3 SW 0 0 0 0 1 6 7 WSW 0 0 0 0 0 2 2 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 1 1 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 3 10 13 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-23

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 5 0 6 NNE 0 0 0 0 0 4 4 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 1 0 1 ESE 0 0 0 2 0 1 3 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 0 1 s 0 0 0 4 1 2 7 SSW 0 0 1 0 7 0 8 SW 0 0 0 0 0 4 4 WSW 0 0 0 2 0 1 3 w 0 0 0 2 0 0 2 WNW 0 0 0 1 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 1 0 1 2 Variable 0 0 0 0 0 0 0 Total 0 0 2 13 14 13 42 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-24

LaSalle County Generating Station Period of Record: April - June 2019 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 2 19 27 30 17 7 102 NNE 1 16 35 17 11 7 87 NE 0 12 29 45 36 4 126 ENE 1 14 16 40 62 28 161 E 1 0 11 20 24 38 94 ESE 1 6 7 17 11 11 53 SE 0 2 1 10 5 1 19 SSE 1 1 2 6 3 3 16 s 0 5 6 9 12 7 39 SSW 2 7 17 16 20 19 81 SW 2 9 30 21 21 9 92 WSW 1 10 14 23 18 8 74 w 0 10 20 24 20 8 82 WNW 1 12 19 22 16 5 75 NW 0 13 15 33 17 16 94 NNW 0 9 24 19 16 20 88 Variable 0 0 0 0 0 0 0 Total 13 145 273 352 309 191 1283 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-25

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 8 2 7 4 24 NNE 1 3 9 3 4 0 20 NE 1 6 8 3 0 1 19 ENE 0 3 14 10 9 0 36 E 1 1 11 36 9 7 65 ESE 0 1 5 23 9 1 39 SE 4 3 5 17 4 5 38 SSE 0 3 6 2 4 2 17 s 1 3 2 12 12 23 53 SSW 0 4 4 9 18 35 70 SW 2 0 7 13 20 14 56 WSW 0 2 7 17 31 13 70 w 1 2 4 13 18 9 47 WNW 1 1 6 7 10 3 28 NW 1 1 6 19 4 2 33 NNW 0 5 4 5 1 0 15 Variable 0 0 0 0 0 0 0 Total 14 40 106 191 160 119 630 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-26

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 2 0 0 3 NNE 0 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 1 0 0 0 0 1 E 0 0 0 1 0 0 1 ESE 1 3 7 3 0 0 14 SE 1 2 8 7 1 0 19 SSE 3 0 5 4 8 3 23 s 1 3 3 2 4 12 25 SSW 1 2 1 6 0 1 11 SW 0 0 6 11 7 0 24 WSW 0 3 3 2 1 4 13 w 1 3 3 10 2 7 26 WNW 0 1 5 5 0 0 11 NW 0 0 5 5 5 0 15 NNW 0 1 0 2 0 0 3 Variable 0 0 0 0 0 0 0 Total 8 20 47 60 28 27 190 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-27

LaSalle County Generating Station Period of Record: April - June 2019 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 1 0 0 0 1 SSE 0 0 0 0 2 0 2 s 0 0 1 1 0 0 2 SSW 0 0 2 2 1 0 5 SW 0 2 4 1 1 3 11 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 1 0 0 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 3 8 4 4 3 22 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-28

LaSalle County Generating Station Period of Record: July - September 2019 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 1 0 0 0 1 ENE 0 0 1 0 0 0 1 E 0 0 3 0 0 0 3 ESE 0 0 1 1 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 1 0 0 0 1 SSW 0 0 3 1 0 0 4 SW 0 0 5 9 1 0 15 WSW 0 0 4 1 0 0 5 w 0 0 13 3 1 0 17 WNW 0 0 3 3 0 0 6 NW 0 0 2 0 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 37 18 2 0 57 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-29

LaSalle County Generating Station Period of Record: July - September 2019 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 0 0 0 1 NNE 0 0 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 3 0 0 0 3 E 0 0 3 2 0 0 5 ESE 0 0 1 1 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 0 0 1 0 0 1 s 0 1 2 1 0 0 4 SSW 0 0 6 1 1 0 8 SW 0 0 6 13 0 0 19 WSW 0 5 10 5 2 0 22 w 0 3 22 5 2 0 32 WNW 0 4 10 0 0 0 14 NW 0 2 2 0 0 0 4 NNW 0 0 1 2 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 15 68 31 5 0 119 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 2019 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 4 0 0 0 5 NNE 0 2 4 0 0 0 6 NE 0 4 4 0 0 0 8 ENE 0 1 1 0 0 0 2 E 0 4 5 2 0 0 11 ESE 0 7 4 0 0 0 11 SE 0 6 1 0 0 0 7 SSE 0 3 0 0 0 0 3 s 0 3 1 0 1 0 5 SSW 0 1 6 2 1 0 10 SW 0 3 7 18 0 0 28 WSW 0 5 11 1 0 0 17 w 0 7 11 4 2 0 24 WNW 0 7 10 0 0 0 17 NW 0 6 4 3 0 0 13 NNW 0 2 3 2 0 0 7 Variable 0 0 0 0 0 0 0 Total 0 62 76 32 4 0 174 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 2019 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 28 19 2 0 0 51 NNE 5 27 16 0 0 0 48 NE 2 23 29 7 0 0 61 ENE 1 16 22 12 0 0 51 E 1 11 37 3 0 0 52 ESE 2 12 14 0 0 0 28 SE 3 11 12 0 0 0 26 SSE 1 12 12 1 0 0 26 s 1 6 15 6 0 0 28 SSW 1 10 20 18 2 0 51 SW 1 10 23 23 0 0 57 WSW 0 8 23 10 0 0 41 w 5 15 12 5 1 0 38 WNW 1 12 23 2 0 0 38 NW 4 14 18 1 0 0 37 NNW 2 23 32 6 1 0 64 Variable 0 0 0 0 0 0 0 Total 32 238 327 96 4 0 697 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 2019 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 41 2 0 0 0 46 NNE 3 24 4 0 0 0 31 NE 2 9 14 0 0 0 25 ENE 3 11 22 0 0 0 36 E 0 29 32 3 0 0 64 ESE 2 8 4 0 0 0 14 SE 4 7 5 1 0 0 17 SSE 2 13 10 5 0 0 30 s 6 10 31 9 0 0 56 SSW 1 15 46 10 0 0 72 SW 5 5 40 9 0 0 59 WSW 5 16 21 0 0 0 42 w 0 16 9 2 0 0 27 WNW 2 13 21 1 0 0 37 NW 4 17 7 0 0 0 28 NNW 4 24 3 1 0 0 32 Variable 0 0 0 0 0 0 0 Total 46 258 271 41 0 0 616 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-33

LaSalle County Generating Station Period of Record: July - September 2019 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 17 0 0 0 0 17 NNE 2 5 0 0 0 0 7 NE 0 2 0 0 0 0 2 ENE 3 1 0 0 0 0 4 E 1 26 6 0 0 0 33 ESE 0 10 0 0 0 0 10 SE 1 13 1 0 0 0 15 SSE 2 9 1 0 0 0 12 s 1 25 19 0 0 0 45 SSW 3 22 17 0 0 0 42 SW 1 12 10 0 0 0 23 WSW 4 17 17 0 0 0 38 w 5 16 10 0 0 0 31 WNW 2 19 1 0 0 0 22 NW 0 2 0 0 0 0 2 NNW 4 12 0 0 0 0 16 Variable 0 0 0 0 0 0 0 Total 29 208 82 0 0 0 319 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 2019 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 10 2 0 0 0 12 ESE 0 25 0 0 0 0 25 SE 0 30 0 0 0 0 30 SSE 0 13 2 0 0 0 15 s 1 33 6 0 0 0 40 SSW 1 30 7 0 0 0 38 SW 0 22 5 0 0 0 27 WSW 0 9 5 0 0 0 14 w 2 11 0 0 0 0 13 WNW 3 9 0 0 0 0 12 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 7 192 27 0 0 0 226 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-35

LaSalle County Generating Station Period of Record: July - September 2019 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-36

LaSalle County Generating Station Period of Record: July - September 2019 Stability Class - Moderately 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 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 1 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 1 0 1 w 0 0 0 1 0 0 1 WNW 0 0 0 1 0 0 1 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 4 1 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: 0 F-37

LaSalle County Generating Station Period of Record: July - September 2019 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 2 0 0 2 NNE 0 0 0 1 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 2 0 0 2 E 0 0 2 2 0 0 4 ESE 0 0 0 3 1 0 4 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 1 0 1 SSW 0 0 1 2 1 0 4 SW 0 0 0 7 5 2 14 WSW 0 0 1 4 0 0 5 w 0 1 8 8 1 1 19 WNW 0 1 6 8 1 0 16 NW 0 0 5 3 0 0 8 NNW 0 0 0 0 2 0 2 Variable 0 0 0 0 0 0 0 Total 0 2 23 42 12 3 82 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-38

LaSalle County Generating Station Period of Record: July - September 2019 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 2 12 39 21 3 0 77 NNE 1 14 20 9 1 0 45 NE 0 14 19 26 13 0 72 ENE 0 12 19 26 11 0 68 E 3 6 27 24 5 0 65 ESE 1 16 19 7 1 0 44 SE 1 12 9 4 1 0 27 SSE 3 12 15 3 2 0 35 s 1 4 13 12 4 1 35 SSW 0 6 18 19 13 8 64 SW 1 6 7 50 36 3 103 WSW 2 8 25 39 9 0 83 w 0 13 23 32 11 7 86 WNW 2 17 20 15 1 0 55 NW 2 12 37 17 8 0 76 NNW 2 11 20 7 6 0 46 Variable 0 0 0 0 0 0 0 Total 21 175 330 311 125 19 981 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 2019 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 4 9 18 8 0 40 NNE 0 3 13 22 0 0 38 NE 0 6 20 14 3 0 43 ENE 2 4 13 24 2 0 45 E 0 5 17 26 13 0 61 ESE 3 4 6 21 7 0 41 SE 0 2 9 5 2 0 18 SSE 0 3 5 6 2 1 17 s 2 3 11 7 7 15 45 SSW 2 5 12 29 40 23 111 SW 2 3 6 30 49 2 92 WSW 0 4 14 17 21 0 56 w 3 4 7 18 11 1 44 WNW 3 10 9 16 5 0 43 NW 2 5 7 9 10 0 33 NNW 0 6 12 11 9 0 38 Variable 0 0 0 0 0 0 0 Total 20 71 170 273 189 42 765 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-40

LaSalle County Generating Station Period of Record: July - September 2019 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 5 5 1 0 13 NNE 2 0 0 2 0 0 4 NE 2 1 1 0 0 0 4 ENE 1 2 3 2 0 0 8 E 0 1 0 1 1 0 3 ESE 0 0 2 12 10 0 24 SE 0 1 6 19 5 0 31 SSE 0 1 10 11 3 1 26 s 0 5 8 18 3 2 36 SSW 0 3 11 21 13 5 53 SW 1 1 7 13 9 0 31 WSW 0 3 6 14 3 0 26 w 0 4 6 17 8 4 39 WNW 1 2 5 6 1 0 15 NW 1 0 8 2 0 0 11 NNW 1 0 8 3 1 0 13 Variable 0 0 0 0 0 0 0 Total 9 26 86 146 58 12 337 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 2019 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 1 0 0 1 SSE 0 0 0 9 0 0 9 s 0 0 0 2 4 0 6 SSW 0 0 0 1 0 0 1 SW 0 0 0 4 3 0 7 WSW 0 1 2 4 0 0 7 w 0 0 0 4 0 0 4 WNW 0 0 0 1 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 2 0 2 Variable 0 0 0 0 0 0 0 Total 0 1 2 26 9 0 38 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 2019 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-43

LaSalle County Generating Station Period of Record: October - December 2019 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 1 0 0 1 SSW 0 0 0 0 0 0 0 SW 0 0 0 1 4 0 5 WSW 0 0 0 1 0 0 1 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 3 4 0 7 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements . in all stability classes: 4 F-44

LaSalle County Generating Station Period of Record: October - December 2019 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 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 1 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 1 1 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 0 2 1 0 0 3 s 0 1 3 0 0 0 4 SSW 0 0 0 2 0 0 2 SW 0 0 1 5 2 0 8 WSW 0 1 3 3 2 0 9 w 0 0 0 0 1 0 1 WNW 0 0 0 1 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 2 11 13 5 0 31 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-45

LaSalle County Generating Station Period of Record: October - December 2019 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 31 48 30 0 0 109 NNE 1 13 16 7 0 0 37 NE 1 3 2 2 0 0 8 ENE 0 5 10 11 0 0 26 E 0 12 15 10 3 1 41 ESE 0 6 7 7 5 1 26 SE 1 4 11 3 0 0 19 SSE 2 5 16 9 0 0 32 s 2 7 22 15 4 0 50 SSW 1 9 26 15 6 1 58 SW 0 11 32 24 4 1 72 WSW 0 14 10 27 15 16 82 w 3 20 34 46 19 1 123 WNW 2 29 47 65 27 0 170 NW 2 21 31 29 4 0 87 NNW 1 24 37 56 15 0 133 Variable 0 0 0 0 0 0 0 Total 16 214 364 356 102 21 1073 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-46

LaSalle County Generating Station Period of Record: October - December 2019 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 17 2 0 0 0 21 NNE 0 1 0 0 0 0 1 NE 3 3 0 0 0 0 6 ENE 2 2 10 0 0 0 14 E 2 8 14 4 0 0 28 ESE 1 5 8 8 3 0 25 SE 4 5 9 5 5 0 28 SSE 2 6 12 6 5 0 31 s 1 10 23 25 4 0 63 SSW 0 11 26 31 8 0 76 SW 4 4 27 15 7 1 58 WSW 2 17 28 14 3 1 65 w 1 14 18 19 2 11 65 WNW 8 11 14 3 3 2 41 NW 0 5 3 3 0 0 11 NNW 0 9 11 1 0 0 21 Variable 0 0 0 0 0 0 0 Total 32 128 205 134 40 15 554 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-47

LaSalle County Generating Station Period of Record: October - December 2019 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 2 0 0 0 0 2 NNE 1 1 0 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 1 3 0 0 0 0 4 E 1 19 15 0 0 0 35 ESE 1 17 5 0 0 0 23 SE 2 18 6 0 0 0 26 SSE 1 5 12 3 0 0 21 s 1 7 24 5 0 0 37 SSW 1 7 25 6 0 0 39 SW 1 5 24 3 0 0 33 WSW 1 7 26 6 0 0 40 w 3 20 17 1 0 0 41 WNW 1 11 6 0 0 0 18 NW 0 1 1 0 0 0 2 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 15 124 161 24 0 0 324 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-48

LaSalle County Generating Station Period of Record: October - December 2019 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 1 0 0 0 0 0 1 E 0 9 7 0 0 0 16 ESE 0 15 3 0 0 0 18 SE 3 27 4 0 0 0 34 SSE 1 19 9 0 0 0 29 s 0 8 11 2 0 0 21 SSW 0 18 31 4 0 0 53 SW 0 8 12 4 0 0 24 WSW 1 7 5 1 0 0 14 w 0 2 1 0 0 0 3 WNW 0 2 0 0 0 0 2 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 6 115 83 11 0 0 215 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-49

LaSalle County Generating Station Period of Record: October - December 2019 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-50

LaSalle County Generating Station Period of Record: October - December 2019 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-51

LaSalle County Generating Station Period of Record: October - December 2019 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 1 2 3 WSW 0 0 0 0 1 0 1 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 2 2 4 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-52

LaSalle County Generating Station Period of Record: October - December 2019 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 13 23 25 31 7 99 NNE 1 8 29 15 1 4 58 NE 0 3 8 5 2 2 20 ENE 0 1 7 9 10 0 27 E 1 8 5 5 9 6 34 ESE 0 5 5 10 8 7 35 SE 0 5 2 11 4 0 22 SSE 1 3 5 17 2 2 30 s 1 2 18 19 16 8 64 SSW 0 5 13 18 19 11 66 SW 0 3 21 39 17 18 98 WSW 1 9 14 20 20 24 88 w 1 2 16 23 41 32 115 WNW 0 17 29 46 44 27 163 NW 0 10 36 41 47 10 144 NNW 0 22 18 34 27 13 114 Variable 0 0 0 0 0 0 0 Total 6 116 249 337 298 171 1177 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-53

LaSalle County Generating Station Period of Record: October - December 2019 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 6 5 7 0 19 NNE 0 4 9 4 0 0 17 NE 0 6 6 2 0 0 14 ENE 1 1 2 5 1 0 10 E 1 3 4 7 15 0 30 ESE 2 3 3 7 9 4 28 SE 0 3 2 7 8 11 31 SSE 0 3 1 7 6 10 27 s 0 2 10 8 16 14 50 SSW 4 3 6 19 22 43 97 SW 0 6 5 11 29 19 70

. WSW 0 4 3 20 19 15 61 w 0 7 8 23 24 13 75 WNW 1 6 13 12 11 28 71 NW 3 2 7 19 7 1 39 NNW 1 1 8 8 6 0 24 Variable 0 0 0 0 0 0 0 Total 13 55 93 164 180 158 663 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-54

LaSalle County Generating Station Period of Record: October - December 2019 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 0 0 0 2 NNE 0 0 0 0 0 0 0 NE 1 1 0 0 0 0 2 ENE 0 1 0 0 0 0 1 E 1 3 3 3 1 0 11 ESE 0 1 3 6 4 1 15 SE 0 0 10 12 10 1 33 SSE 0 3 3 9 6 3 24 s 0 3 7 12 11 13 46 SSW 0 3 2 7 7 11 30 SW 0 3 1 9 24 17 54 WSW 0 0 6 15 3 8 32 w 0 1 4 8 6 1 20 WNW 2 0 1 15 1 0 19 NW 0 1 0 2 1 0 4 NNW 0 0 0 1 0 0 1 Variable 0 0 0 0 0 0 0 Total 4 21 41 99 74 55 294 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-55

LaSalle County Generating Station Period of Record: October - December 2019 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 1 0 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 1 0 0 0 1 SE 0 0 3 3 2 0 8 SSE 0 0 3 12 3 3 21 s 0 0 0 3 1 1 5 SSW 0 0 2 0 0 1 3 SW 0 0 7 6 3 8 24 WSW 0 0 0 1 0 1 2 w 0 0 0 0 0 0 0 WNW 0 0 0 1 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 1 0 16 26 9 14 66 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4 F-56

APPENDIX G ERRATA DATA

Intentionally left blank There is no errata data for 2019.

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 1and2 Annual Radiological Groundwater Protection Program Report 1 January through 31 December 2019 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation LaSalle County Station Marseilles, IL 61341 May 2020

Table Of Contents I. Summary and Conclusions ......................................................................................... 1 II. Introduction ................................................................................................................ 2 A. Objectives of the RGPP ....................................................................................... 2 B. Implementation of the Objectives ......................................................................... 3 C. Program Description ............................................................................................. 3 D. Characteristics of Tritium (H-3) ............................................................................ 4 Ill. Program Description ................................................................................................. 5 A. Sample Analysis .................................................................................................. 5 B. Data Interpretation .............................................................................................. 5 C. Background Analysis .......................................................................................... 6

1. Background Concentrations of Tritium ..................................................... 6 IV. Results and Discussion ............................................................................................ 8 A. Groundwater Results .......................................................................................... 8 B. Surface Water Results ........................................................................................ 9 C. Drinking Water Well Survey .............................................................................. 10 D. Summary of Results - Inter-laboratory Comparison Program ............................ 10 E. Leaks, Spills, and Releases ............................................................................... 11 F. Trends ............................................................................................................... 11 G. Investigations .................................................................................................... 11 H. Actions Taken .................................................................................................... 11

Appendices Appendix A Location Designation Tables Table A-1 LaSalle County Station Groundwater Monitoring Sample Point List, 2019 Figures Figure A-1 LaSalle County Station Map of Groundwater Monitoring Sampling Locations, 2019 Appendix B Data Tables Tables Table 8-1.1 Concentrations of Tritium, Strontium, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2019 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2019 Table 8-1.3 Concentrations of Hard-to-Detects in Groundwater Samples Collected as Part of the Radiological Groundwater Protection Program, LaSalle County Station, 2019 Table 8-11.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2019 Table 8-11.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2019 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 2019 are included in this report.

This is the twelfth 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 2019. During that time period, 325 analyses were performed on 94 samples from 26 locations (6 surface water and 20 groundwater monitoring 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 and Strontium-90 were not detected in any groundwater samples during 2019.

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.

Tritium was not detected in surface water samples at concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Tritium levels were detected at concentrations greater than the LLD of 200 pCi/L in 8 of 16 surface water samples analyzed. The tritium concentrations ranged from <LLD to 395 +/- 136 pCi/L. Tritium levels were detected at concentrations greater than the LLD of 200 pCi/L in 21 of 78 groundwater samples analyzed. The tritium concentrations ranged from <LLD to 5,490 +/- 604 pCi/L. The elevated tritium levels (>200 pCi/L) being observed in groundwater are associated with the U1 CY tank leak that occurred in the June/July 2010 timeframe, as documented in the Station's 10 CFR 50.75(g) report.

Gross alpha and gross beta analyses in the dissolved and suspended fractions were performed on groundwater samples throughout the year in 2019. Gross alpha (dissolved) was detected in 3 of 16 samples affecting 3 of 12 groundwater locations analyzed. The concentrations ranged from 0.7 to 15.0 pCi/L. Gross alpha (suspended) was detected in 6 of 16 samples affecting 6of12 groundwater locations analyzed. The concentrations ranged from 1.4 to 5.3 pCi/L.

Gross beta (dissolved) was detected in 11 of 16 samples affecting 9 of 12 groundwater locations analyzed. The concentrations ranged from 1.5 to 10.7 pCi/L. Gross beta (suspended) was detected in 6 of 16 samples affecting 6 of 12 groundwater locations analyzed. The concentrations ranged from 3.0 to 20.4 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. The isotopes of U-234 and U-238 were detected in 6 samples of each, affecting 2 of 12 groundwater locations. The U-234 concentrations ranged from 0.32 to 0.99 pCi/L. The U-238 concentrations ranged from 0.14 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.

II. 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 2019.

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-7 and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

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

Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the LaSalle County Station RGPP in 2019. Sample and analysis and frequency is based upon well location, assessed risk and site hydrogeology as described in the RGPP.

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

1. Concentrations of gamma emitters in groundwater and surface water

2. Concentrations of strontium in groundwater

3. Concentrations of tritium in groundwater and surface water

4. Concentrations of gross alpha (dissolved and suspended) and gross beta (dissolved and suspended) in groundwater

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

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

Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. La Salle'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 USE PA, this corresponds to a +/- 70 to 100 pCi/L 95% confidence bound on each given measurement. Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 - 240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV. Results and Discussion A. Groundwater Results 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 20 locations were analyzed for tritium activity. Tritium values ranged from <LLD to 5,490 pCi/L. The highest tritium activity was found at well TW-LS-116S. 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 18 samples from 15 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 and Gross Beta (dissolved and suspended)

Gross alpha and gross beta analyses in the dissolved and suspended fractions were performed on groundwater samples throughout the year in 2019. Gross alpha (dissolved) was detected in 3 of 16 samples affecting 3of12 groundwater locations analyzed. The concentrations ranged from

0. 7 to 15.0 pCi/L. Gross alpha (suspended) was detected in 6 of 16 samples affecting 6of12 groundwater locations analyzed. The concentrations ranged from 1.4 to 5.3 pCi/L.

Gross beta (dissolved) was detected in 11 of 16 samples affecting 9 of 12 groundwater locations analyzed. The concentrations ranged from 1.5 to 10.7 pCi/L. Gross beta (suspended) was detected in 6of16 samples affecting 6of12 groundwater locations analyzed. The concentrations ranged from 3.0 to 20.4 pCi/L.

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

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

Hard-To-Detect Hard-to-detect analyses were performed on 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 6 of 9 samples, affecting 2 of 12 groundwater locations. The concentrations ranged from 0.32 to 0.99 pCi/L. U-238 was detected in 6 of 9 samples, affecting 2 of 12 groundwater locations. The concentrations ranged from 0.14 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 Samples were collected from on and off-site surface water locations throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from 6 locations were analyzed for tritium activity. Eight (8) of 18 samples from 5 surface water locations indicated activity above the minimum detectable concentration (MDC). The concentrations ranged from <181 to 395 pCi/L. 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-11.1, Appendix B).

Strontium Sr-89 and Sr-90 analyses were not performed on surface water samples in 2019.

Gross Alpha and Gross Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were not performed on surface water samples in 2019.

Gamma Emitters No gamma-emitting nuclides were detected at concentrations greater than their respective minimum detectable concentrations. (Table B-11.2, Appendix B).

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

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

E. Leaks, Spills, and Releases 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-1 OOS and RW-LS-101 S) were installed to control the migration of the tritium plume near U 1 CY tank.

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

APPENDIX A LOCATION DESIGNATION

Intentionally left blank TABLE A-1 LaSalle County Station Groundwater Monitoring Sample Point List, 2019 Site Site Type SW-LS-101 Surface Water SW-LS-102 Surface Water SW-LS-103 Surface Water SW-LS-106 Surface Water MW-LS-101S Monitoring Well MW-LS-102S Monitoring Well MW-LS-103S Monitoring Well MW-LS-104S Monitoring Well MW-LS-105S Monitoring Well MW-LS-106S Monitoring Well MW-LS-107S Monitoring Well MW-LS-1088 Monitoring Well MW-LS-109S Monitoring Well MW-LS-110S Monitoring Well MW-LS-111S Monitoring Well MW-LS-112S Monitoring Well MW-LS-113S Monitoring Well HP-2 Monitoring Well HP-5 Monitoring Well HP-7 Monitoring Well HP-10 Monitoring Well RW-LS-1008 Extraction Well RW-LS-1018 Extraction Well TW-LS-1148 Monitoring Well TW-LS-115S Monitoring Well TW-LS-1168 Monitoring Well TW-LS-117S Monitoring Well TW-LS-118S Monitoring Well TW-LS-119S Monitoring Well TW-LS-120S Monitoring Well TW-LS-121S Monitoring Well A-1

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APPENDIX B DATA TABLES

Intentionally left blank TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PC I/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

HP-2 03/18/19 < 185 HP-2 06/06/19 < 188 < 8.4 < 0.7 < 1.1 < 1.2 5.2 +/- 1.1 < 2.1 HP-2 09/04119 < 193 HP-2 11/11/19 < 193 HP-5 03/18/19 < 182 HP-5 06/06/19 < 182 < 7.5 < 0.9 < 1.0 2.7 +/- 1.1 5.2 +/- 1.2 3.0 +/- 1.1 HP-5 09/04/19 < 192 HP-5 11/11119 < 192 HP-7 03/18/19 < 189 HP-7 06/07/19 < 198 < 7.2 < 0.7 < 0.7 2.1 +/- 1.2 3.6 +/- 0.9 3.5 +/- 1.2 HP-7 09/04/19 < 186 HP-7 11/11/19 < 192 HP-10 03/18/19 < 188 HP-10 06/06/19 < 197 < 6.2 < 0.8 < 0.9 2.3 +/- 1.4 < 1.4 3.2 +/- 1.4 HP-10 09/04/19 < 191 HP-10 11/11/19 < 189 MW-LS-104S 03/18/19 2560 +/- 314 MW-LS-104S 06/06/19 1610 +/- 232 < 7.8 < 0.9 < 1.0 < 1.1 < 1.4 < 1.5 MW-LS-104S 09/04/19 2940 +/- 361 < 9.5 < 0.8 < 0.9 < 1.1 < 1.3 < 1.6 MW-LS-104S 11/15/19 1690 +/- 231 < 2.8 < 0 .9 < 1.0 < 1.2 < 1.4 < 1.5 MW-LS-105S 03/18/19 < 191 MW-LS-105S 06/06/19 < 188 < 8.5 < 0.8 0.7 +/- 0.4 5.3 +/- 2.2 < 1.0 20.4 +/- 2.6 MW-LS-105S 09/04/19 < 195 MW-LS-105S 11/15/19 < 191 MW-LS-106S 03/19/19 < 183 MW-LS-106S 06/06/19 < 182 MW-LS-107S 03/18/19 < 189 MW-LS-107S 06/06/19 < 188 < 7.9 < 0.6 7.9 +/- 5.0 2.6 +/- 0.7 4.9 +/- 2.5 3.2 +/- 1.0 MW-LS-107S 09/04/19 < 194 MW-LS-1G7S 11/11/19 < 192 MW-LS-111S 03/19/19 < 186 MW-LS- 111S 06/06/19 < 187 < 5.6 < 0.9 15.0 +/- 4.6 1.4 +/- 0.7 10.7 +/- 3.0 6.7 +/- 1.5 MW-LS-111S 09/04/19 < 191 MW-LS-1118 11/12119 < 193 OIL SEPARATOR 03/18/19 266 +/- 128 OIL SEPARATOR 06/06/19 < 197 OIL SEPARATOR 09/04/19 < 193 OIL SEPARATOR 11/12119 < 167 RW-LS-100S 03/18/19 318 +/- 127 RW-LS-100S 06/04/19 1370 +/- 213 < 7.3 < 1.0 RW-LS-100S 09/04/19 1310 +/- 202 < 7.7 < 0.7 < 0.9 < 1.1 3.2 +/- 1.0 < 1.6 RW-LS-100S 11/11/19 814 +/- 151 < 7.6 < 0.9 < 1.1 < 1.2 4.4 +/- 1.0 < 1.5 RW-LS-101S 03/18/19 1580 +/- 229 RW-LS-101S 06/04/19 2170 +/- 284 < 8.1 < 0.8 RW- LS-101S 09/04/19 2230 +/- 285 < 7.8 < 0 .7 < 0.8 < 1.1 5.0 +/- 1.0 < 1.6 RW-LS-101S 11/11/19 2820 +/- 341 < 1.6 < 0.8 < 1.1 < 1.2 5.3 +/- 1.0 < 1.5 TW-LS-114S 03/18/19 < 187 TW-LS-114S 06/06/19 < 196 TW-LS-114S 09/04/19 < 190 TW-LS-1148 11/11/19 < 194 TW-LS-115S 03/19/19 < 190 TW-LS-115S 06/06/19 < 199 B-1

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

TW-LS-115S 09/04/19 < 192 TW-LS-115S 11/11/19 < 173 TW-LS-116S 03/18/19 4460 +/- 508 TW-LS-116S 06/06/19 5050 +/- 567 TW-LS-116S 09/04/19 5490 +/- 604 TW-LS-116S 11/11/19 3970 +/- 453 < 3.2 < 0.8 < 1.0 < 1.2 1.5 +/- 0.8 < 1.5 TW-LS-117S 03/18/19 < 188 TW-LS-117S 06/06/19 < 199 TW-LS-117S 09/04/19 < 192 TW-LS-117S 11/11/19 < 175 TW-LS-118S 03/18/19 4260 +/- 487 TW-LS-118S 06/06/19 4230 +/- 487 TW-LS-118S 09/04/19 3710 +/- 431 TW-LS-118S 11/11/19 3350 +/- 392 < 3.4 < 0.8 < 1.0 < 1.2 7.9 +/- 1.0 < 1.5 TW-LS-119S 03/18/19 < 187 TW-LS-119S 06/06/19 < 198 TW-LS-119S 09/04/19 < 189 TW-LS-119S 11/11/19 < 175 TW-LS-120S 03/18/19 < 184 TW-LS-120S 06/06/19 < 195 TW-LS-120S 09/04/19 < 192 TW-LS-120S 11/11/19 < 173 TW-LS-121S 03/18/19 < 183 TW-LS-121S 06/06/19 < 194 TW-LS-121S 09/04/19 < 194 TW-LS-121S 11/11/19 < 177 B-2

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/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 06/06/19 < 15 < 12 <1 < 1 <3 < 1 <3 < 1 <3 <7 <2 <2 < 12 <4 HP-5 06/06/19 < 15 < 16 <2 <2 <4 <2 <3 <2 <3 <7 <2 <2 < 15 <5 HP-7 06/07/19 < 16 < 16 <2 <2 <4 < 2 <4 <2 <3 <6 <2 <2 < 13 < 5 HP-10 06/06/19 < 15 < 14 < 1 <2 <4 <2 < 3 <2 < 3 <7 <2 <2 < 13 <4 MW-L5-1045 06/06/19 < 16 < 28 <2 <2 <4 <2 <3 <2 <3 <7 <2 <2 < 14 <5 MW-L5-1045 09/04/19 < 18 < 18 <2 <2 <5 <2 <4 <2 <4 < 10 <2 <2 < 18 <6 MW-LS-1045 11/15/19 < 55 < 80 < 5 <6 < 12 <7 < 15 <6 <8 < 11 <6 < 5 < 33 < 13 MW-L5-1055 06/06/19 < 16 < 14 < 1 <2 <4 <2 <3 <2 <3 <7 <2 <2 < 14 < 5 MW-L5-1065 06/06/19 < 16 < 17 <2 <2 <4 <2 <4 <2 <3 <7 <2 <2 < 15 <6 MW-LS-107S 06/06/19 < 17 < 27 <2 <2 <5 <2 <3 <2 <3 <8 <2 <2 < 15 < 5 MW-LS-1115 06/06/19 < 17 < 13 <2 <2 <4 < 1 < 3 <2 < 3 <9 <2 <2 < 15 <5 RW-L5-1005 06/04/19 < 16 < 14 < 1 <2 <4 < 1 <3 <2 <3 < 8 <2 <2 < 14 <4 mI RW-LS-100S 09/04/19 < 17 < 16 <2 < 2 <4 <2 <3 <2 <3 <9 <2 <2 < 16 <5 c:.>

RW-LS-1005 11/11/19 < 26 < 28 <3 <3 <6 < 3 <6 < 3 <5 <9 <3 <3 < 21 <6 RW-L5-1015 06/04/19 < 17 < 32 <2 <2 <4 <2 <3 <2 <3 <8 <2 <2 < 15 < 5 RW-LS-1015 09/04/19 < 17 < 34 <2 <2 <4 <2 < 3 <2 <3 <9 <2 <2 < 16 <5 RW-L5-1015 11111/19 < 26 < 59 < 3 <3 <7 <3 <6 <3 <6 < 10 <3 < 3 < 21 <6 TW-LS-1165 11/11/19 < 32 < 28 < 3 <3 <7 <3 <6 <4 <6 < 10 <3 <3 < 23 <7 TW-L5-1185 11/11/19 < 31 < 52 <3 <3 <8 <4 <7 <3 <5 < 10 <3 <3 < 22 < 8

TABLE B-1.3 CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE GROUNDWATER PROTECTION PROGRAM, LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/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-2 06/06/19 < 100 < 4.0 HP-5 06/06/19 < 73 < 4 .0 HP-7 06/07/19 < 76 < 3.8 HP-10 06/06/19 < 118 < 3.8 MW-LS-104S 06/06/19 < 0.07 < 0.02 < 0.04 < 0.16 < 0.13 0.99 +/- 0.25 < 0.07 0.77 +/- 0.22 < 44 < 4.2 MW-LS-104S 09/04/19 < 0.12 < 0.03 < 0.15 < 0.10 < 0.09 0.98 +/- 0.25 < 0.10 0.98 +/- 0.25 < 73 < 4.4 MW-LS-104S 11/15/19 < 0.13 < 0.05 < 0.13 < 0.17 < 0.12 0.59 +/- 0.17 < 0.02 0.66 +/- 0.18 < 66 < 4.0 MW-LS-105S 06/06/19 < 48 < 3.9 MW-LS-107S 06/06/19 < 116 < 3.5 MW-LS- 111S 06/06/19 < 178 < 4.4 RW-LS-100S 06/04/19 < 0.08 < 0.02 < 0.06 < 0.07 < 0.07 < 0.02 < 0.02 < 0.09 < 68 < 3.8 RW-LS-100S 09/04/19 < 0.11 < 0.03 < 0.10 < 0.16 < 0.17 < 0.15 < 0.06 < 0.13 < 58 < 4 .5 IJJ RW-LS-100S 11/11/19 < 0.03 < 0.03 < 0.12 < 0.08 < 0.16 < 0.12 < 0.08 < 0.08 < 45 < 3.9 I

~ RW-LS-101S 06/04/19 < 0.07 < 0.02 < 0.02 < 0.09 < 0.13 0.32 +/- 0.13 < 0.06 0.21 +/- 0.11 < 84 < 4.0 RW-LS-101S 09/04/19 < 0.07 < 0.02 < 0.02 < 0.11 < 0.07 0.37 +/- 0.15 < 0.04 0.14 +/- 0.09 < 141 < 4.2 RW-LS-101S 11/11/19 < 0.11 < 0.02 < 0.09 < 0.11 < 0.20 0.34 +/- 0.15 < 0.06 0.39 +/- 0.16 < 140 < 4.4 TW-LS-116S 11/11/19 < 72 < 4.0 TW-LS-118S 11/11/19 < 75 < 4.2

TABLE B-11.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SW-LS-101 03/19/19 231 +/- 126 SW-LS-101 06/06/19 < 186 SW-LS-101 11/12/19 < 194 SW-LS-1018 09/04/19 < 190 SW-LS-102 03/19/19 < 187 SW-LS-102 06/06/19 < 186 SW-LS-102 09/04/19 253 +/- 129 SW-LS-102 11/12/19 < 193 SW-LS-103 03/19/19 395 +/- 136 SW-LS-103 06/06/19 < 181 SW-LS-103 09/04/19 211 +/- 126 SW-LS-103 11/12/19 245 +/- 125 SW-LS-106 03/18/19 260 +/- 129 SW-LS-106 06/07/19 < 185 SW-LS-106 11/14/19 254 +/- 128 SW-LS-1068 09/04/19 209 +/- 127 B-5

TABLE B-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2019 RESULTS IN UNITS OF PCl/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 SW-LS-101 06/06/19 < 16 < 15 < 2 <2 <4 <2 < 3 <2 < 3 <8 <2 <2 < 14 < 5 SW-LS-102 06/06/19 < 20 < 17 <2 < 2 <4 <2 <4 <2 <4 < 10 <2 <2 < 17 < 5 SW-LS-103 06/06/19 < 16 < 29 <2 <2 <4 <2 < 3 <2 < 3 <7 <2 <2 < 15 < 5 SW-LS-106 06/07/19 < 20 < 19 <2 <2 < 5 <2 <4 <2 <4 <9 < 2 < 2 < 17 <5 IJJ I

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RA20-026, 2019 Annual Radiological Environmental Operating Report

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