SVPLTR 19-0021, Annual Radiological Groundwater Protection Program Report

Annual Radiological Groundwater Protection Program Report

ML19136A197
Person / Time
Site:	Dresden
Issue date:	05/31/2019
From:	Exelon Generation Co, Teledyne Brown Engineering Environmental Services
To:	Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
Shared Package
ML19136A201	List: SVPLTR 19-0021, Annual Radiological Groundwater Protection Program Report
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SVPLTR# 19-0021
Download: ML19136A197 (34)

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Docket No: 50-010 50-237 50-249 DRESDEN NUCLEAR POWER STATION UNITS 1, 2 and 3 Annual Radiological Groundwater Protection Program Report 1 January through 31 December 2018 Prepared By Teledyne Brown Engineering Environmental Services

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v*p Exelon Generation Dresden Nuclear Power Station Morris, IL 60450 May 2019

Intentionally left blank Table of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction ..................................................................................................................... 2 A Objectives of the RGPP ...................................................................................... 3 B. Implementation of the Objectives ........................................................................ 4 C. Program Description ........................................................................................... 4 D. Characteristics of Tritium (H-3) ........................................................................... 5 111. Program Description ...................................................................................................... 5 A. Sample Analysis .................................................................................................. 5 B. Data Interpretation ............................................................................................... 6 C. Background Analysis ........................................................................................... 7

1. Background Concentrations of Tritium ..................................................... 7 IV. Results and Discussion ................................................................................................. 9 A. Groundwater Results ........................................................................................... 9 B. Surface Water Results ...................................................................................... 11 C. Precipitation Water Results ............................................................................... 11 D. Drinking Water Well Survey .............................................................................. 11 E. Summary of Results - Inter-laboratory Comparison Program .......................... 12 F. Leaks, Spills, and Releases .............................................................................. 12 G. Trends ............................................................................................................... 12 H. Investigations .................................................................................................... 12 I. Actions Taken ..................................................................................................... 12

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Appendices ARGPPR Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Dresden Nuclear Power Station, 2018 Figures Security-Related Information: Maps of the Dresden Nuclear Power Station have been withheld from public disclosure under 10CFR2.390 and N.J.S.A. 47:1A-1.1 ARGPPR Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2018 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2018 Table B-1.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2018 Table B-11.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2018 Table B-11.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2018 Table B-111.1 Concentrations of Tritium in Precipitation Water Samples Collected in the Vicinity of Dresden Nuclear Power Station, 2018

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I. Summary and Conclusions Dresden Station is situated on approximately 600 acres of land that borders the Illinois River to the north and the Kankakee River to the east. This land is referred to as the owner-controlled area. The Dresden power plant itself takes up a small parcel of the owner-controlled area and is surrounded by a security fence. The security fence defines what is known as the Protected Area (PA).

The Dresden power plant has experienced leaks from underground lines and spills from systems containing radioactive water over its 50 year history. These incidents have created a number of areas of localized contamination within the PA. The liquid scintillation analyses of groundwater in many of these areas show measurable concentrations of tritium (H-3).

• Dresden participated in a fleetwide hydrogeologic investigation in during the summer of 2006 in an effort to characterize groundwater movement at each site.

This investigation also compiled a list of the historic spills and leaks as well as a detailed analysis on groundwater hydrology for Dresden Nuclear Generation Station. Combining the tritium concentration in a locally contaminated area with the speed and direction of groundwater in the vicinity can produce a contaminated groundwater plume projection. If the plume of contaminated groundwater passes through the path of a groundwater monitoring well, it can be anticipated that the tritium concentration in this well will increase to some. maximum concentration, then decrease over time.

The fleetwide Hydrogeologic Investigation Report (HIR) shows that groundwater movement on the Dresden site is very slow. In addition, there is a confining rock layer, the Maquoketa Shale layer, about 55 feet below the surface that impedes groundwater movement below this depth.

Dresden has a domestic water system that is supplied by two deep wells (1500 feet deep) that were installed about 50 years ago south of the PA. Samples taken from domestic water supply have never shown any detectable tritium concentration.

Tritium has a half-life of 12.3 years. This means that 40 years from now 90% of*

the tritium on site today will have decayed away to more stable elements. Given the limited volume of contaminated groundwater on site, radioactive decay, slow groundwater movement, and dilution effects, the conclusion of the HIR is that the operation of Dresden Nuclear Power Station has no adverse radiological impact

. on the environment. As a result there is little potential for contaminated groundwater on site to affect off-site drinking water.

II. Introduction Radiological Groundwater Monitoring Program (RGPP):

Dresden has a Radiological Groundwater Monitoring Program (RGPP) that provides long-term monitoring intended to verify the fleet-wide hydrogeologic study conclusions. Dresden uses developed groundwater wells and surface water sample points in the RGPP.

The Dresden RGPP was established in 2006 and there have been no significant changes to this program. This program does not impact the operation of the plant and is independent of the REMP.

Developed groundwater wells are wells that were installed specifically for monitoring groundwater. These wells are equipped with screens and are properly sealed near the surface to avoid surface water intrusion. The wells were designed in accordance with appropriate codes and developed in accordance with appropriate standards and procedures. Dresden has groundwater monitoring wells identified as "shallow" (depths from 15 to 35 feet),

"Intermediate" (depths from 35 to 55 feet) and .deep" (depths beyond 100 feet).

All wells installed to a depth greater than 100 feet ("deep" wells) were found to be dry and removed from the RGPP. Surface water sample points are identified sample locations in the station's canals and cooling pond.

There are 96 sampling points in the RGPP:

Dresden has 47 developed groundwater monitoring wells within the Protected Area (PA). Some of these wells form a ring just inside the security fence and the remaining wells were installed near underground plant system piping that contains radioactive water.

Dresden has 30 developed groundwater monitoring wells outside the PA the majority of which form a ring just within the perimeter of the property.

Dresden has 12 surface water monitoring locations on the owner-controlled area sampled as part of the Dresden RGPP. Three of these locations are monitored for level only and have no analyses in the accompanying tables.

Dresden has 4 precipitation water monitoring locations sampled as part of the Dresden RGPP. An additional 8 locations were studied in 2011 through 2012, but only 4 locations are currently permanently a part of the RGPP program.

Dresden has 1 sentinel well and 2 CST leak detection valves. These 3 sampling points are not constructed to code or developed to a standard. These sampling points are idle and only used for qualitative troubleshooting.

The Dresden site-specific RGPP procedure identifies the historic 'events' that would affect the individual RGPP sample results. This procedure identifies threshold values for each sample point, which if exceeded, could be an indication of a new spill from an above ground system or a new leak in an underground pipe containing tritiated water.

The RGPP sample points are currently sampled on a frequency determined by the well detection category in accordance with site document EN-DR-408-4160, Dresden RGPP Reference Material. During 2018, there were 693 analyses that were performed on 280 samples from 80 sampling points.

Sentinel Wells, sometimes referred to as "baby wells" are wells that were installed to monitor local shallow groundwater; typically in associated with a historic underground pipe leak. These wells are not constructed to code or developed to a standard. Most sentinel wells are from 6 to 12 feet deep and consist of 2" PVC pipe without screens. These wells are categorized as idle wells and are used only for troubleshooting purposes.

Dresden has two basic storm water runoff sewer systems within the P.A: one storm-system routes to the east, then north and discharges into the Unit 1 intake canal, the second storm-system routes to the west, then north, through a large Oil/Water Separator and discharges to the hot canal. Both the Unit 1 intake canal and the hot canal eventually route to the cooling pond. The Dresden Station RGPP has twelve RGPP surface water sampling points to monitor these systems.

A Objectives of the RGPP The Objective of the RGPP is to provide long-term monitoring intended to verify the fleet-wide hydrogeologic study conclusions. The objective of the site-specific RGPP is to provide indication of short-term changes to groundwater tritium concentrations within the PA If isotopic results of groundwater samples exceed the thresholds specified in this procedure it could be an indication of a new spill from an above ground system or a new leak in an underground pipe containing tritiated water.

Specific Objectives include:

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

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

3. Regularly assess analytical results to identify adverse trends.

4. Take necessary corrective actions to protect groundwater resources.

B. Implementation of the Objectives

1. Dresden Nuclear Power Station will continue to perform routine sampling and radiological analysis of water from selected locations.

2. Dresden Nuclear Power Station has implemented procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.

3. Dresden Nuclear Power Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

4. If an adverse trend in groundwater monitoring analytical results is identified, further investigation will be undertaken. If the investigation identifies a leak or unidentified spill, corrective actions will be implemented.

C. Program Description Dresden has a Radiological Groundwater Monitoring Program (RGPP) that provides long-term monitoring intended to verify the fleet-wide hydrogeologic study conclusions. Dresden uses 89 developed groundwater wells and surface water sample points in the RGPP.

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

Groundwater and Surface Water Water samples are collected in accordance with the schedule delineated in the Dresden site-specific RGPP procedures.

Analytical laboratories are subject to internal quality assurance programs, industry crosscheck programs, as well as nuclear industry audits. Station personnel review and evaluate the analytical results.

D. Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.

Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin.

Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity and in special production reactors, where the isotopes lithium-? and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (3He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium 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 Teledyne Brown Engineers (TBE) to analyze the environmental samples for radioactivity for the Dresden Nuclear Power Station RGPP in 2018.

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, surface water and precipitation water.

4. Concentrations of gross alpha and gross beta 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-233/234, 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 Dresden Nuclear Power Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Dresden Nuclear Power 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 the 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.

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

For groundwater and surface water 14 nuclides, 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 and La-140 were reported.

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, marine life, and food stuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for Dresden Nuclear Power Nuclear Power Station, Commonwealth Edison Company, Annual Report 1986, May 1987.

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

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

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

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

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

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

Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980.

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.

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. These sample results cannot be distinguished as different from background at this concentration.

IV. Results and Discussion Dresden Station initiated a Radiological Groundwater Protection Program (RGPP) in 2006.

A. Groundwater Results Groundwater Samples were collected from on-site wells throughout the year in accordance with Dresden's RGPP. Analytical results and anomalies are discussed below:

Tritium Following historic ground tritium-contamination events at Dresden Station routine sampling and analyses continue, both inside and outside the protected area, in accordance with site procedure EN-DR-408-4160, Dresden Station RGPP Reference Material.

Low level tritium was detected from January through December 2018 in several sampling and testing locations (Table B-1.1, Appendix B);

however, overall tritium concentrations have been trending down.

The vast majority of these locations showed a range of tritium contamination from LLD to values less than 20,000 pCi/L.

MD-11 and MW-DN-124-1 were the only 2 locations with tritium concentrations above 20,000 pCi/L. The highest level ever reached during calendar year 2018 was 97,200 pCi/L by MD-11 (sample collected on 02/21/2018).

It is important to note that wells that exceed the United States Environmental Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L were due to the 2014 2/3B CST Leak. The exceedances are located within Station property, and do not serve as a drinking water source.

Strontium Samples were collected and analyzed for Sr-89 and Sr-90 activity (Table B-1.1, Appendix B). Sr-89 was not detected in any of the samples. Sr-90 was detected in 3 samples at location MW-DN-105S. The concentrations ranged from 1.4 to 2.0 pCi/L.

Gross Alpha and Gross Beta (dissolved and suspended)

Most Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during the second quarter of 2018 (Table B-1.1, Appendix B). Gross Alpha (dissolved) was detected in 2 groundwater locations with concentrations ranging from 2.9 to 3.0 pCi/L. Gross Alpha (suspended) was detected in 6 groundwater locations with concentrations ranging from 1.4 to 8.6 pCi/L.

Gross Beta (dissolved) was detected at 27 of the groundwater locations.

The concentrations ranged from 1.1 to 37.8 pCi/L. Gross Beta (suspended) was detected in 5 groundwater locations with concentrations ranging from 2.2 to 11.0 pCi/L. The 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.

Gamma Emitters Only naturally-occurring nuclides were detected in 2 samples. No other gamma-emitting nuclides were detected (Table B-1.2, Appendix B).

Hard-To-Detects Hard-To-Detect analyses were performed on 12 groundwater locations to establish background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-233/234, U-235 and U-238. U-233/234 was detected at MD-11 at a concentration of 0.39 pCi/L. U-233/234 was detected at MW-DN-101-1 with concentrations ranging from 0.26 to 0.46 pCi/L. U-238 was detected at MW-DN-101-1 with concentrations ranging from 0.18 to 0.33 pCi/L. (Table B-1.3, Appendix B). Ni-63 was detected in samples taken at MW-DN-101-1 and MW-DN-119-1. The concentrations ranged from 6.2 to 48. 7 pCi/L. All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs.

B. Surface Water Results Surface Water Samples were collected from 9 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 all locations were analyzed for tritium activity (Table B-11.1, Appendix B). Tritium values ranged from the detection limit to 3,600 pCi/L. The measurable concentrations of tritium are from an upstream source.

Gamma Emitters No gamma-emitting nuclides were detected in any surface water samples.

(Table B-11.2, Appendix B)

C. Precipitation Water Results Precipitation Water Samples were collected from 4 precipitation water locations throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from 4 locations were analyzed for tritium activity (Table B-111.1, Appendix B). Tritium was not detected in any samples.

D. Drinking Water Well Survey No drinking water well surveys were conducted in 2018.

E. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in theAREOR.

F. Leaks, Spills, and Releases No leaks, spills, and releases occurred in 2018.

G. Trends Overall, tritium concentrations are decreasing across the Station. The Station continued to implement the tritium monitoring plan with monthly/quarterly sampling of a subset of shallow and intermediate aquifer wells, sewage treatment plant water, and storm sewer water.

An elevated concentration persists in the area of the Condensate Storage Tanks (Event 20 in EN-DR-408-4160, Revision 6, Attachment 3). As of December 2015, active remediation was implemented. Two remediation wells were installed in August 2015, however, the West remediation well is capable of enough recharge for active remediation.

H. Investigations No investigations performed in 2018.

I. Actions Taken

1. Compensatory Actions None.

2. Actions to Recover/Reverse Plumes In August 2015, two remediation wells were installed by the CSTs.

The intent is to pump tritiated water out of the ground. The water is processed through the liquid radwaste system. Active remediation was initiated in December 2015. Remediation continued through 2017.

APPENDIX A LOCATION DESIGNATION

Intentionally left blank TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Dresden Nuclear Power Station, 2018 Site Site Type Location DSP-105 Monitoring Well 30 feet east of the east wall of the EM Shop DSP-106 Monitoring Well 65 feet east of east wall of EM Shop DSP-107 Monitoring Well 9 feet east of the east Unit 1 Fuel Pool wall DSP-108 Monitoring Well 40 ft east of the Unit 1 Sphere DSP-117 Monitoring Well Northeast of Unit 1 Sphere; 825 feet west of Ross Bridge DSP-121 Monitoring Well 72 feet north of 2/3 Intake Canal fence DSP-122 Monitoring Well 50 feet north of the Radwaste Tank Farm DSP-123 Monitoring Well Northeast comer of the Unit 1 Off-gas Building DSP-124 Monitoring Well 9 feet south of Floor Drain Collector Tank DSP-125 Monitoring Well Northeast comer of the Unit 2/3A CST DSP-126 Monitoring Well 21 feet northwest of the northwest bend in road behind Training Building DSP-147 Monitoring Well 325 feet west of Telemetry Bridge DSP-148 Monitoring Well 130 feet southeast of the Flow Regulating Station building DSP-149R Monitoring Well 35 feet south by southwest of the 138 KV yard fence DSP-150 Monitoring Well 85 feet east of the northeast comer of the Unit 1 Spent Fuel Pool pad DSP-151 Monitoring Well 65 feet north of the northeast corner of the Storeroom DSP-152 Monitoring Well 21 O feet south by southeast of the southeast corner of Maintenance Garage DSP-153 Monitoring Well 150 feet east of the southeast corner of liquid hydrogen tank farm fence DSP-154 Monitoring Well 33 feet west of the track; 165 feet east of the Security Checkpoint DSP-156 Monitoring Well 70 feet east by northeast of the northwest corner of 138 KV yard fence DSP-157-1 Monitoring Well 25 feet south of the south edge of the Employee Parking lot DSP-157-M Monitoring Well 25 feet south of the south edge of the Employee Parking lot DSP-157-S Monitoring Well 25 feet south of the south edge of the Employee Parking lot DSP-158-1 Monitoring Well 53 feet west of the Kankakee River; 33 feet west of the cinder track DSP-158-M Monitoring Well 53 feet west of the Kankakee River; 33 feet west of the cinder track DSP-158-S Monitoring Well 50 feet west of the Kankakee River; 33 feet west of the cinder track DSP-159-1 Monitoring Well 250 feet west of the Thorsen house; 450 ft south of the plant access gate DSP-159-M Monitoring Well 250 feet west of the Thorsen house; 450 ft south of the plant access gate DSP-159-S Monitoring Well 251 feet west of the Thorsen house; 450 ft south of the plant access gate MW-DN-101-1 Monitoring Well 60 feet north of the Unit 1 Diesel Fuel Storage MW-DN-101-S Monitoring Well 60 feet north of the Unit 1 Diesel Fuel Storage MW-DN-102-1 Monitoring Well 12 feet south of the southeast corner of the MUDS Building MW-DN-102-S Monitoring Well 13 feet south of the southeast corner of the MUDS Building MW-DN-103-1 Monitoring Well 280 feet west of the northwest corner of N-GET Building MW-DN-103-S Monitoring Well 281 feet west of the northwest corner of N-GET Building MW-DN-104-S Monitoring Well 50 feet north of Radwaste Tank Farm MW-DN-105-S Monitoring Well 65 feet north of the northeast corner of the Storeroom MW-DN-106-S Monitoring Well 75 feet north of the 2/3 Intake Canal fence; east of the Unit 1 Intake Canal MW-DN-107-S Monitoring Well 15 feet west by southwest of the Unit 1 CST MW-DN-108-1 Monitoring Well 7 feet southwest of the southwest corner of the Unit 1 Cribhouse MW-DN-109-1 Monitoring Well 8 feet north of Chemistry Building MW-DN-109-S Monitoring Well 8 feet north of Chemistry Building MW-DN-110-1 Monitoring Well 25 feet west of the Waste Water Treatment (WWT) Building MW-DN-110-S Monitoring Well 25 feet west of the Waste Water Treatment (WWT) Building MW-DN-111-S Monitoring Well 9 feet east of the Floor Drain Collector Tank MW-DN-112-1 Monitoring Well 100 feet south of the Chemistry Building MW-DN-112-S Monitoring Well 100 feet south of the Chemistry Building MW-DN-113-1 Monitoring Well 90 feet west of the southwest comer of the Administration Building MW-DN-113-S Monitoring Well 91 feet west of the southwest comer of the Administration Building MW-DN-114-1 Monitoring Well 50 feet east of the Unit 1 Clean Demineralized Water Tank MW-DN-114-S Monitoring Well 8 feet southwest of the Radiation protection Dept west access doors MW-DN-115-1 Monitoring Well 11 feet south of Instrument Maintenance Shop MW-DN-115-S Monitoring Well 12 feet south of Instrument Maintenance Shop MW-DN-116-1 Monitoring Well 75 feet south of the Calgon Building roll-up door MW-DN-116-S Monitoring Well 75 feet south of the Calgon Building roll-up door MW-DN-117-1 Monitoring Well 35 feet east by northeast of the Unit 1 Stack MW-DN-118-S Monitoring Well Southeast corner of the Unit 1 Fuel Pool MW-DN-119-1 Monitoring Well 20 feet east by northeast of the Unit 1 Sewage Ejector Building A-1

TABLEA-1: Radiological Groundwater Protection Program - Sampling Locations, Dresden Nuclear Power Station, 2018 Site Site Type Location MW-DN-119-S Monitoring Well 21 feet east by northeast of the Unit 1 Sewage Ejector Building MW-DN-120-1 Monitoring Well 45 feet north by northeast of the Ross Bridge railing MW-DN-120-S Monitoring Well 46 feet north by northeast of the Ross Bridge railing MW-DN-121-S Monitoring Well 7 feet west of the dirt road; 42 feet east of the 345KV yard fence MW-DN-122-1 Monitoring Well 150 feet north of Collins Road; northeast of the G.E. Fuel Storage Facility MW-DN-122-S Monitoring Well 150 feet north of Collins Road; northeast of the G.E. Fuel Storage Facility MW-DN-123-1 Monitoring Well 400 feet west of the Thorsen house; west of the Cold Canal MW-DN-123-S Monitoring Well 400 feet west of the Thorsen house; west of the Cold Canal MW-DN-124-1 Monitoring Well 10 feet south of the liquid nitrogen inerting tanks MW-DN-124-S Monitoring Well 10 feet south of the liquid nitrogen inerting tanks MW-DN-125-S Monitoring Well 40 feet east of 2/3 B CST MW-DN-126-S Monitoring Well 15 feet south offence around Unit 2/3 A CST and B CST (outside offence)

MW-DN-127-S Monitoring Well 20 feet south of Unit 3 HRSS MW-DN-134-S Monitoring Well 20-ft North of Mausoleum Building MW-DN-135-S Monitoring Well 20-ft East of Mausoleum Building MW-DN-136-S Monitoring Well 14.5-ft South of Mausoleum Building MW-DN-137-S Monitoring Well 20-ft West of Mausoleum Building MW-DN-140-S Monitoring Well East of MW-DN-104S at SW corner outside of 2/3 crib house MW-DN-141-S Monitoring Well North of 'A' Waste Tank next to 2/3 main chimney MD-11 Sample Location Piping located between Condensate Storage Tanks.

DSP-131 Storm water - 35 ft NE of the Unit 2/3 heating boiler 150,000 gallon diesel fuel storage Surface Water tank 15 ft W of the hot canal fence - underneath Security Block DSP-132 Storm water - 150 ft NE of the Unit 1 Sphere. The sewer is in the middle of the road with a solid cover (no slots). There are two other sewers in the vicinity with solid Surface Water covers on them, but both have the word "SANITARY" on the cover.

The sewer is 66 ft SE of the Unit 1 diesel fuel transfer shed.

DSP-133 Surface Water Storm water ditch north of Pre-Access Facility SW-DN-101 Surface Water Unit 2/3 Intake (DSP50) at the Ross Bridge SW-DN-102 Surface Water Unit 2/3 Discharge (DSP20) at the Telemetry Bridge SW-DN-103 Surface Water Unit 2/3 Return Canal at the Discharge to the Intake Canal SW-DN-104 Surface Water Cold Canal (DSP34A) at the Cooling Tower walkway bridge SW-DN-105 Surface Water Hot Canal (DSP34B) at the Cooling Tower walkway bridge SW-DN-106 Surface Water Cooling Pond - Pool II at the east side of the Covered Bridge 2/3 Discharge Hot Canal Level Surface Water 2/3 Discharge Hot Canal Headworks 2/3 Cribhouse Cold Canal Level Surface Water 2/3 Cribhouse Unit 1 Cribhouse Intake Level Surface Water Unit 1 Cribhouse FW-1 40 feet southwest of Unit 2/3 Off-gas Filter Building access door; north end of Precipitation guardrail FW-10 Precipitation At the fence at the northwest comer of the SBO Building FW-11 Precipitation 30 feet east of the east wall of the EM shop; at the stanchion for RGPP well DSP-105 FW-12 Precipitation 60 feet southeast of the southwest corner of the Adm in Building; on the security fence A-2

APPENDIX 8 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 DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

DSP-105 02/26/18 < 190 DSP-105 06/15/18 < 191 < 9.5 < 0.6 < 1.3 < 1.1 4.8 +/- 1.2 < 1.6 DSP-105 09/19/18 < 199 DSP-105 11/07/18 192 +/- 117 DSP-106 01/31/18 < 2.6 < 0.6 DSP-106 02/26/18 1500 +/- 218 DSP-106 06/15/18 1610 +/- 229 < 6.5 < 0.5 < 1.1 < 1.1 4.3 +/- 1.1 < 1.6 DSP-106 09/19/18 1800 +/- 252 DSP-106 11/07/18 1560 +/- 217 DSP-106 11/07/18 1660 +/- 226 DSP-107 01/25/18 < 2.7 < 0.9 DSP-107 02/26/18 1930 +/- 259 DSP-107 06/15/18 1920 +/- 258 < 5.3 < 0.9 < 1.2 < 1.1 5.6 +/- 1.2 < 1.6 DSP-107 09/19/18 1920 +/- 263 DSP-107 11/07/18 1800 +/- 239 DSP-107 11/07/18 1990 +/- 256 DSP-108 02/26/18 437 +/- 139 DSP-108 06/15/18 506 +/- 143 < 4.9 < 0.6 < 4.7 < 1.1 11.6 +/- 1.8 < 1.6 DSP-108 09/19/18 411 +/- 135 DSP-108 11/07/18 438 +/- 129 DSP-122 02/22/18 435 +/- 133 DSP-122 06/14/18 473 +/- 142 DSP-122 09/18/18 381 +/- 137 DSP-122 11/06/18 678 +/- 142 DSP-123 02/23/18 779 +/- 149 DSP-123 06/14/18 757 +/- 154 < 5.1 < 0.6 < 1.9 < 1.2 6.8 +/- 1.3 < 1.6 DSP-123 09/18/18 686 +/- 149 DSP-123 11/06/18 607 +/- 136 DSP-124 02/22/18 786 +/- 150 DSP-124 06/18/18 605 +/- 147 DSP-124 09/20/18 744 +/- 151 DSP-124 11/09/18 878 +/- 153 DSP-125 02/21/18 < 181 DSP-125 06/13/18 200 +/- 130 < 5.7 < 0.5 < 5.1 1.7 +/- 0.8 11.2 +/- 3.2 < 2.0 DSP-125 09/25/18 359 +/- 137 DSP-125 11/08/18 314 +/- 125 DSP-126 06/20/18 < 190 DSP-132 11/13/18 < 197 DSP-147 06/20/18 < 196 DSP-148 02/28/18 < 178 DSP-148 06/19/18 299 +/- 131 DSP-148 09/17/18 < 195 DSP-148 11/12/18 272 +/- 121 DSP-149R 02/28/18 434 +/- 133 DSP-149R 06/19/18 559 +/- 143 DSP-149R 09/17/18 < 196 DSP-149R 11/12/18 501 +/- 134 DSP-150 02/26/18 . < 187 DSP-150 06/15/18 < 197 DSP-150 09/19/18 < 192 DSP-150 11/07/18 < 195 DSP-151 01/25/18 < 7.4 < 0.8 DSP-151 02/26/18 < 185 DSP-151 06/15/18 < 193 DSP-151 09/19/18 < 190 DSP-151 11/07/18 < 188 DSP-154 06/19/18 < 192 DSP-156 02/28/18 < 177 DSP-156 06/19/18 < 189 DSP-156 09/17/18 < 191 DSP-156 11/12/18 < 193 DSP-157-M 06/20/18 < 192 BOLD values = Unable to meet detection limits due to high solids content 8-1

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

DSP-157-S 06/20/18 < 193 DSP-159-M 06/20/18 425 +/- 136 DSP-159-S 06/20/18 < 191 MD-11 02/21/18 97200 +/- 9760 < 8.7 < 0.8 < 1.2 < 0.6 29.0 +/- 1.6 < 1.4 MD-11 06/13/18 62200 +/- 5380 MD-11 08/31/18 41800 +/- 4210 MD-11 09/25/18 43400 +/- 4390 MD-11 11/08/18 46100 +/- 4650 < 2.5 < 0.7 < 1.0 < 0.8 18.8 +/- 1.5 < 1.7 MD-11 11/08/18 45600 +/- 4610 MW-DN-101-1 01/24/18 < 2.4 < 0.6 MW-DN-101-1 02/23/18 607 +/- 141 < 2.0 < 0.3 MW-DN-101-1 06/14/18 584 +/- 148 < 5.0 < 0.7 < 4.6 < 1.1 < 2.2 < 1.6 MW-DN-101-1 09/18/18 450 +/- 139 < 8.0 < 0.9 MW-DN-101-1 11/07/18 568 +/- 143 < 3.7 < 0.9 MW-DN-101-S 01/24/18 < 4.7 < 0.6 MW-DN-101-S 02/23/18 < 179 MW-DN-101-S 06/14/18 < 190 < 5.6 < 0.7 < 4.3 < 1.7 < 6.3 < 4.0 MW-DN-101-S 09/18/18 < 192 MW-DN-101-S 11/07/18 < 195 MW-DN-102-1 02/21/18 < 178 MW-DN-102-1 06/13/18 < 190 < 4.8 < 0.5 < 4.5 < 1.7 < 6.5 < 4.0 MW-DN-102-1 09/20/18 < 193 MW-DN-102-1 11/08/18 < 200 MW-DN-102-S 02/21/18 < 179 MW-DN-102-S 06/13/18 < 194 < 4.7 < 0.8 < 20.2 1.4 +/- 0.4 37.8 +/- 11.8 2.2 +/- 0.5 MW-DN-102-S 09/20/18 < 191 MW-DN-102-S 11/08/18 < 191 MW-DN-103-1 06/20/18 < 193 MW-DN-103-S 06/20/18 < 167 MW-DN-104-S 02/22/18 < 176 MW-DN-104-S 06/14/18 284 +/- 131 MW-DN-104-S 09/18/18 < 195 MW-DN-104-S 11/06/18 193 +/- 124 MW-DN-105-S 01/25/18 < 6.7 < 0.8 MW-DN-105-S 02/26/18 < 176 < 4.2 < 0.6 MW-DN-105-S 06/15/18 < 197 < 6.9 1.4 +/- 0.5 MW-DN-105-S 09/19/18 < 196 < 2.2 1.7 +/- 0.5 MW-DN-105-S 11/07/18 < 188 < 2.4 2.0 +/- 0.5 MW-DN-106-S 06/19/18 < 196 MW-DN-107-S 02/21/18 < 179 MW-DN-107-S 06/13/18 < 195 MW-DN-107-S 07/31/18 < 194 MW-DN-107-S 09/25/18 1110 +/- 183 MW-DN-107-S 11/08/18 260 +/- 130 MW-DN-109-1 02/22/18 353 +/- 127 MW-DN-109-1 06/14/18 485 +/- 142 < 5.4 < 0.6 < 3.8 < 1.6 12.7 +/- 3.9 < 3.4 MW-DN-109-1 09/18/18 490 +/- 142 MW-DN-109-1 11/06/18 357 +/- 133 MW-DN-109-S 02/22/18 < 170 MW-DN-109-S 06/14/18 < 193 < 5.2 < 0.5 < 5.2 < 1.6 18.2 +/- 4.9 < 3.4 MW-DN-109-S 09/18/18 < 192 MW-DN-109-S 11/06/18 < 190 MW-DN-110-1 02/22/18 275 +/- 122 MW-DN-110-1 06/14/18 < 193 MW-DN-110-1 09/18/18 < 190 MW-DN-110-1 11/06/18 < 195 MW-DN-110-S 02/22/18 < 170 MW-DN-110-S 06/14/18 < 193 MW-DN-110-S 09/18/18 < 196 MW-DN-110-S 11/06/18 < 193 MW-DN-111-S 02/22/18 239 +/- 117 MW-DN-111-S 06/18/18 858 +/- 164 BOLD values = Unable to meet detection limits due to high solids content B-2

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

MW-DN-111-S 09/20/18 839 +/- 160 MW-DN-111-S 11/09/18 351 +/- 136 MW-DN-112-1 02/22/18 < 173 MW-DN-112-1 06/18/18 < 192 MW-DN-112-1 09/20/18 < 192 MW-DN-112-1 11/09/18 < 198 MW-DN-112-S 02/22/18 < 169 MW-DN-112-S 06/18/18 < 189 MW-DN-112-S 09/20/18 < 191 MW-DN-112-S 11/09/18 < 195 MW-DN-113-1 02/21/18 < 172 MW-DN-113-1 06/13/18 196 +/- 125 < 4.8 < 0.6 < 3.7 7.9 +/- 1.8 < 5.3 9.8 +/- 1.8 MW-DN-113-1 09/20/18 < 186 MW-D N-113-1 11/08/18 < 192 MW-DN-113-S 02/21/18 < 173 MW-DN-113-S 06/13/18 < 189 < 6.6 < 0.6 < 2.1 8.6 +/- 2.1 < 3.9 11.0 +/- 2.6 MW-DN-113-S 09/20/18 < 188 MW-DN-113-S 11/08/18 < 195 MW-DN-114-1 02/27/18 4500 +/- 500 MW-DN-114-1 06/13/18 4340 +/- 493 MW-DN-114-1 09/19/18 499 +/- 142 MW-DN-114-1 11/08/18 438 +/- 140 MW-DN-114-1 11/08/18 4230 +/- 484 MW-DN-114-S 02/27/18 2510 +/- 311 MW-DN-114-S 06/13/18 15800 +/- 1640 MW-DN-114-S 06/13/18 Recount 17500 +/- 1800 MW-DN-114-S 06/13/18 Reanalysis 16700 +/- 1730 MW-DN-114-S 07/31/18 669 +/- 150 MW-DN-114-S 08/31/18 10400 +/- 1090 MW-DN-114-S 09/25/18 218 +/- 128 MW-DN-114-S 11/08/18 < 197 MW-DN-114-S 11/08/18 674 +/- 154 MW-DN-115-1 02/26/18 401 +/- 128 MW-DN-115-1 06/13/18 428 +/- 139 MW-DN-115-1 07/31/18 383 +/- 141 MW-DN-115-1 09/19/18 471 +/- 137 MW-DN-115-1 11/07/18 389 +/- 137 MW-DN-115-S 02/26/18 306 +/- 128 MW-DN-115-S 06/13/18 < 189 MW-DN-115-S 09/19/18 < 185 MW-DN-115-S 11/07/18 < 194 MW-DN-116-1 02/23/18 < 186 MW-DN-116-1 06/14/18 248 +/- 128 < 4.8 < 0.7 < 1.7 < 0.6 9.3 +/- 1.3 < 1.7 MW-DN-116-1 09/18/18 343 +/- 132 MW-DN-116-1 11/06/18 < 192 MW-DN-116-1 11/06/18 329 +/- 133 MW-DN-116-S 02/23/18 < 181 MW-DN-116-S 06/14/18 < 194 < 3.2 < 0.7 < 1.6 < 0.9 10.2 +/- 1.3 < 1.7 MW-DN-116-S 09/18/18 194 +/- 121 MW-DN-116-S 11/06/18 < 193 MW-DN-117-1 02/23/18 < 183 MW-DN-117-1 06/14/18 < 192 MW-DN-117-1 09/18/18 < 181 < 5.8 < 0.8 < 1.2 < 0.5 3.7 +/- 1.0 < 1.3 MW-DN-117-1 11/06/18 < 192 < 2.7 < 0.9 < 0.9 < 0.8 3.5 +/- 0.9 < 1.7 MW-DN-118-S 01/25/18 < 7.6 < 0.8 MW-DN-118-S 02/26/18 < 182 MW-DN-118-S 06/15/18 < 192 < 3.2 < 0.8 < 0.6 < 0.9 1.1 +/- 0.6 < 1.7 MW-DN-118-S 07/31/18 < 200 MW-DN-118-S 09/19/18 < 180 MW-DN-118-S 11/07/18 < 194 MW-DN-119-1 01/24/18 < 2.9 < 0.7 MW-DN-119-1 02/23/18 < 182 BOLD values = Unable to meet detection limits due to high solids content B-3

TABLE 8-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A(Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

MW-DN-119-1 06/15/18 < 191 < 3.5 < 0.8 3.0 +/- 1.7 < 0.5 15.8 +/- 2.2 < 1.2 MW-DN-119-1 09/19/18 < 182 MW-DN-119-1 10/23/18 < 4.1 < 0.7 MW-DN-119-1 11/07/18 < 193 MW-DN-119-1 11/20/18 < 2.2 < 0.9 < 3.9 < 1.0 20.6 +/- 2.2 < 1.5 MW-DN-119-S 01/24/18 < 9.4 < 0.9 MW-DN-119-S 02/23/18 < 182 MW-DN-119-S 06/15/18 < 193 < 3.5 < 0.7 < 3.0 4.3 +/- 1.6 10.9 +/- 1.7 6.5 +/- 1.6 MW-DN-119-S 09/19/18 < 185 MW-DN-119-S 11/07/18 < 194 MW-DN-122-1 06/20/18 < 190 MW-DN-122-S 06/20/18 < 194 MW-DN-124-1 02/21/18 25700 +/- 2620 MW-DN-124-1 06/13/18 23100 +/- 2360 < 3.3 < 0.9 < 3.7 < 1.5 14.6 +/- 4.2 < 3.6 MW-DN-124-1 09/20/18 22200 +/- 2250 MW-DN-124-1 11/08/18 20200 +/- 2080 MW-DN-124-1 11/08/18 22700 +/- 2320 MW-DN-124-S 02/21/18 2590 +/- 318 MW-DN-124-S 06/13/18 1110 +/- 182 < 3.4 < 0.6 < 3.7 3.5 +/- 1.5 6.1 +/- 3.9 < 3.7 MW-DN-124-S 09/20/18 3790 +/- 433 MW-DN-124-S 11/08/18 2330 +/- 301 MW-DN-124-S 11/08/18 1460 +/- 217 MW-DN-125-S 02/22/18 < 183 MW-DN-125-S 06/13/18 < 194 < 2.8 < 0.8 < 5.3 < 1.5 < 7.4 < 3.7 MW-DN-125-S 09/20/18 < 181 MW-DN-125-S 11/08/18 < 195 MW-DN-126-S 02/21/18 < 179 MW-DN-126-S 06/13/18 < 193 < 3.4 < 0.6 < 1.6 < 1.5 < 3.7 < 3.6 MW-DN-126-S 09/25/18 < 180 MW-DN-126-S 11/08/18 < 195 MW-DN-127-S 02/21/18 < 179 MW-DN-127-S 06/13/18 < 187 < 2.5 < 0.8 < 0.5 < 0.9 1.2 +/- 0.6 < 1.7 MW-DN-127-S 07/31/18 671 +/- 149 MW-DN-127-S 09/20/18 < 184 MW-DN-127-S 11/08/18 < 192 MW-DN-134-S 02/28/18 < 183 MW-DN-134-S 06/20/18 < 190 < 3.5 < 0.8 2.9 +/- 1.2 < 0.9 6.1 +/- 1.2 < 1.7 MW-DN-134-S 09/17/18 < 177 MW-DN-134-S 11/12/18 < 191 MW-DN-135-S 02/28/18 < 181 MW-DN-135-S 06/20/18 < 193 < 3.1 < 0.7 < 1.5 < 0.9 7.0 +/- 1.3 < *1.7 MW-DN-135-S 09/17/18 < 190 MW-DN-135-S 11/12/18 < 197 MW-DN-136-S 02/28/18 < 183 MW-DN-136-S 06/20/18 < 194 < 2.7 < 0.7 < 3.3 < 1.4 10.9 +/- 3.8 < 3.6 MW-DN-136-S 09/17/18 < 194 MW-DN-136-S 11/12/18 < 198 MW-DN-137-S 02/28/18 < 182 MW-DN-137-S 06/20/18 < 190 < 2.8 < 0.6 < 3.4 < 1.4 10.0 +/- 3.9 < 3.7 MW-DN-137-S 09/17/18 < 192 MW-DN-137-S 11/12/18 < 197 MW-DN-140-S 02/23/18 334 +/- 128 MW-DN-140-S 06/14/18 403 +/- 141 MW-DN-140-S 09/18/18 546 +/- 141 MW-DN-140-S 11/06/18 < 193 MW-DN-140-S 11/06/18 240 +/- 130 MW-DN-141-S 02/23/18 < 182 MW-DN-141-S 06/14/18 648 +/- 148 < 7.1 < 0.7 < 0.7 < 1.0 17.5 +/- 1.3 2.7 +/- 1 MW-DN-141-S 09/18/18 559 +/- 145 MW-DN-141-S 11/06/18 362 +/- 135 MW-DN-141-S 11/06/18 < 195 MW-DN-142-S 02/28/18 < 178 BOLD values = Unable to meet detection limits due to high solids content B-4

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

MW-DN-142-S 06/20/18 < 195 < 3.8 < 0.7 < 4.3 < 1.5 24.6 +/- 5.3 < 3.7 MW-DN-142-S 09/17/18 < 189 MW-DN-142-S 11/12/18 < 197 MW-DN-143-S 02/28/18 < 183 MW-DN-143-S 06/20/18 < 193 < 2.7 < 0.6 < 3.1 < 1.4 6.6 +/- 3.5 < 3.7 MW-DN-143-S 09/17/18 < 189 MW-DN-143-S 11/12/18 < 192 MW-DN-144-S 02/28/18 < 190 MW-DN-144-S 06/20/18 < 194 < 2.9 < 0.7 < 3.3 < 1.4 7.8 +/- 3.7 < 3.7 MW-DN-144-S 09/17/18 < 190 MW-DN-144-S 11/12/18 < 194 BOLD values = Unable to meet detection limits due to high solids content B-5

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 DSP-105 02/26/18 < 66 < 84 < 6 < 10 < 16 < 6 < 19 < 8 < 14 < 15 < 8 < 8 < 45 < 14 DSP-105 06/15/18 < 49 < 97 <4 < 5 < 12 < 5 < 10 < 5 < 8 < 15 < 5 < 5 < 34 < 10 DSP-105 09/19/18 < 39 < 66 <4 <4 < 10 < 5 < 8 < 5 < 8 < 14 < 5 <3 < 30 < 11 DSP-105 11/07/18 < 63 < 109 < 5 <5 < 14 <4 < 10 <7 < 10 < 15 <6 <7 < 40 < 11 DSP-106 01/31/18 < 59 < 74 <7 <7 < 12 < 9 < 15 < 7 < 13 < 11 < 8 < 8 < 34 < 13 DSP-106 02/26/18 < 54 < 114 < 6 < 7 < 18 < 6 < 15 < 8 < 13 < 15 < 7 < 7 < 38 < 11 DSP-106 06/15/18 < 44 < 48 <4 <6 < 11 <4 < 10 <4 < 10 < 13 < 5 <6 < 30 < 10 DSP-106 09/19/18 < 27 < 84 <2 <3 < 6 <4 <7 <3 <4 < 11 <4 <4 < 24 <7 DSP-106 11/07/18 < 45 < 48 <5 <5 < 10 < 6 < 12 < 6 < 8 < 15 <5 < 5 < 30 < 12 DSP-107 01/25/18 < 48 < 45 < 6 < 5 < 14 <6 < 9 <6 < 10 < 14 < 5 < 5 < 29 <9 DSP-107 02/26/18 < 59 < 70 < 6 <7 < 14 < 8 < 13 < 9 < 10 < 13 <7 <6 < 39 < 10 DSP-107 06/15/18 < 42 < 82 < 5 <6 < 9 <4 < 9 < 6 < 10 < 14 <6 <6 < 30 < 14 DSP-107 09/19/18 < 42 < 62 <4 <4 < 10 <4 < 8 <4 <6 < 15 <4 <4 < 32 < 12 DSP-107 11/20/18 < 40 < 98 <4 <4 < 10 <4 < 10 < 6 < 7 < 8 < 5 < 6 < 22 <6 DSP-108 02/26/18 < 62 < 63 < 6 < 7 < 15 <7 < 16 < 7 < 12 < 15 < 7 < 8 < 35 < 11 DSP-108 06/15/18 < 53 < 34 < 6 <6 < 15 < 5 < 11 <6 < 9 < 15 < 5 <6 < 32 < 15 Ill DSP-108 09/19/18 < 25 < 71 < 3 <2 <7 < 3 < 5 < 3 <4 < 11 <4 <2 < 24 < 5 I

a, DSP-108 11/07/18 < 42 < 98 <5 <5 < 10 <4 < 10 < 5 < 8 < 14 < 5 <5 < 28 < 10 DSP-123 02/23/18 < 51 < 108 <6 <6 < 13 < 5 < 12 < 6 < 11 < 14 <6 <6 < 38 < 12 DSP-123 06/14/18 < 45 < 67 < 6 < 5 < 12 <6 < 10 <6 < 9 < 14 <6 <6 < 33 < 14 DSP-123 09/18/18 < 18 < 18 < 2 <2 <4 <2 <4 <2 < 3 < 8 <2 <2 < 16 <5 DSP-123 11/06/18 < 20 45 +/- 25 < 2 <2 < 5 <2 <4 < 2 <4 <7 <2 <2 < 15 <4 DSP-125 06/13/18 < 43 < 77 < 5 < 5 < 10 < 5 < 9 <5 < 9 < 14 <5 <5 < 38 < 11 DSP-126 06/20/18 < 78 < 162 < 9 < 8 < 14 < 9 < 19 < 10 < 15 < 14 < 8 < 8 < 37 < 13 DSP-147 06/20/18 < 55 < 117 < 7 < 5 < 13 < 7 < 14 < 5 < 11 < 12 < 8 <7 < 24 < 13 DSP-151 01/25/18 < 55 < 126 < 5 <6 < 12 < 7 < 13 < 5 < 10 < 15 <6 <6 < 30 < 13 DSP-154 06/19/18 < 66 < 116 < 8 < 9 < 11 < 7 < 10 <6 < 10 < 13 < 7 <6 < 33 < 11 DSP-157-M 06/20/18 < 54 < 77 < 7 < 5 < 12 < 6 < 13 < 8 < 11 < 12 < 8 < 8 < 27 < 15 DSP-157-S 06/20/18 < 58 < 84 <6 < 8 < 15 < 7 < 15 < 8 < 12 < 12 < 8 <7 < 30 <7 DSP-159-M 06/20/18 < 62 < 61 <7 < 8 < 13 < 6 < 13 <7 < 10 < 12 < 8 <7 < 33 <9 DSP-159-S 06/20/18 < 22 < 47 < 2 <3 < 5 < 2 < 5 <2 <4 <7 <3 <2 < 15 <4 MD-11 02/21/18 < 45 < 36 <4 < 5 < 11 <4 < 9 < 6 < 10 < 15 <6 <6 < 32 < 11 MD-11 11/08/18 < 57 < 101 < 6 <6 < 12 < 5 < 15 <7 < 10 < 15 <6 <6 < 40 < 11 MW-DN-101-1 01/24/18 < 45 < 49 < 5 <5 < 12 <4 < 12 < 5 < 10 < 15 < 5 <6 < 31 < 10 MW-DN-101-1 02/23/18 < 45 < 106 < 6 <5 < 10 < 5 < 9 <6 < 10 < 15 <6 <5 < 32 < 11 MW-DN-101-1 06/14/18 < 50 < 115 <4 < 6 < 11 < 5 < 11 <6 < 10 < 15 < 6 < 5 < 36 < 12 MW-DN-101-1 09/18/18 < 23 < 41 < 2 <3 < 6 <2 < 5 < 3 < 5 < 11 < 3 <2 < 21 <7 MW-DN-101-1 11/07/18 < 36 < 58 < 3 <4 < 5 <4 < 8 <4 < 5 < 12 <4 < 3 < 23 <7 MW-DN-101-S 01/24/18 < 35 < 98 < 5 <6 < 9 < 6 < 10 <4 < 10 < 13 < 5 <6 < 33 < 10

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 MW-DN-101-S 02/23/18 < 59 < 66 < 5 <6 < 16 < 6 < 9 < 7 < 11 < 14 < 6 <6 < 31 < 12 MW-DN-101-S 06/14/18 < 39 < 42 < 3 < 5 < 12 < 4 < 8 <4 < 8 < 15 < 4 < 4 < 30 < 10 MW-DN-101-S 09/18/18 < 12 < 33 < 1 < 1 <3 < 1 < 2 < 1 < 2 < 5 < 1 < 1 < 10 <4 MW-DN-101-S 11/07/18 < 39 < 76 <4 <5 < 8 < 4 < 11 <6 < 8 < 12 <3 <5 < 31 < 10 MW-DN-102-1 06/13/18 < 18 < 42 <2 < 2 < 5 < 2 < 4 <2 <4 < 6 <2 <2 < 14 < 5 MW-DN-102-S 06/13/18 < 15 < 15 <2 <2 <4 < 2 < 3 <2 < 3 < 5 <2 <2 < 12 <4 MW-DN-103-1 06/20/18 < 71 < 85 < 8 <7 < 14 < 3 < 16 < 7 < 13 < 15 < 10 < 8 < 43 < 11 MW-DN-103-S 06/20/18 < 64 < 146 < 6 < 8 < 15 < 7 < 10 < 8 < 14 < 13 <8 < 8 < 33 < 10 MW-DN-105-S 01 /25/18 < 41 < 90 < 5 <5 < 11 <4 < 10 <5 < 9 < 11 <5 <5 < 26 < 9 MW-DN-106-S 06/19/18 < 73 < 206 < 8 < 7 < 21 < 8 < 17 < 8 < 14 < 14 < 10 < 8 < 46 < 14 MW-DN-109-1 06/14/18 < 44 < 125 < 5 < 5 < 11 < 5 < 7 <6 <9 < 14 < 5 <5 < 35 < 12 MW-DN-109-S 06/14/18 < 25 < 61 <3 <3 < 6 < 3 < 5 <3 < 5 < 9 < 3 < 3 < 18 <6 MW-DN-113-1 06/13/18 < 20 < 19 < 2 <2 <4 < 2 <4 <2 < 4 < 8 <2 <2 < 16 < 4 MW-DN-113-S 06/13/18 27 +/- 18 < 40 <2 < 2 <5 < 2 <5 < 2 <4 < 7 < 2 <2 < 15 <6 MW-DN-116-1 02/23/18 < 58 < 43 < 6 < 6 < 12 < 5 < 13 < 6 < 11 < 15 <6 <6 < 40 < 12 MW-DN-116-1 06/14/18 < 23 < 46 < 2 <2 < 5 < 2 <4 <2 <4 < 8 < 3 <2 < 16 <5 Ill I

MW-DN-116-1 09/18/18 < 24 < 41 <2 <3 < 5 < 3 < 5 <3 < 5 < 11 <3 <2 < 21 < 6

...... MW-DN-116-1 11/06/18 < 21 < 20 < 2 <2 < 5 < 2 <4 < 2 <7 <2

< 4 <2 < 16 <5 MW-DN-116-S 02/23/18 < 50 < 117 < 5 <4 < 9 < 5 < 10 < 5 < 10 < 15 <6 < 6 < 32 < 13 MW-DN-116-S 06/14/18 < 20 < 40 < 2 < 2 <5 < 3 <5 <2 <4 < 7 <3 <2 < 15 <6 MW-DN-116-S 09/18/18 < 27 < 68 < 3 <3 <7 < 3 < 5 < 3 <6 < 13 < 3 <3 < 26 <8 MW-DN-116-S 11 /06/18 < 27 < 27 < 3 <3 < 6 < 3 < 6 <3 < 5 < 10 <3 <3 < 21 <8 MW-DN-117-1 02/23/18 < 47 < 40 < 5 < 5 < 12 < 4 < 7 < 6 < 10 < 13 <6 <5 < 27 < 12 MW-DN-117-1 06/14/18 < 45 < 44 < 5 <7 < 12 < 5 < 9 <5 <8 < 15 <6 <5 < 34 < 10 MW-DN-117-1 09/18/18 < 27 < 49 < 3 < 3 < 7 <3 < 6 <3 < 5 < 12 <3 <3 < 24 <8 MW-DN-117-1 11 /06/18 < 32 < 26 < 3 <3 < 7 <4 <7 <4 <6 < 10 <4 <3 < 21 <8 MW-DN-118-S 01/25/18 < 45 < 36 <4 <5 < 11 < 6 < 10 <4 < 9 < 12 <5 <5 < 26 < 8 MW-DN-118-S 02/26/18 < 58 < 70 < 7 < 7 < 14 < 5 < 14 < 8 < 14 < 14 < 7 <7 < 39 < 12 MW-DN-118-S 06/15/18 < 43 < 85 <4 < 4 < 11 < 5 < 8 <5 <7 < 14 < 5 <4 < 26 < 10 MW-DN-118-S 09/19/18 < 24 < 54 < 2 <3 < 6 <2 < 5 <3 < 5 < 10 < 3 <2 < 19 <7 MW-DN-118-S 11 /20/18 < 53 < 97 <6 <6 < 10 < 8 < 15 <7 < 10 < 11 <7 <6 < 30 < 7 MW-DN-119-1 01/24/18 < 61 < 135 < 6 <7 < 13 <6 < 14 < 8 < 11 < 12 < 8 <8 < 32 < 8 MW-DN-119-1 06/15/18 < 55 < 124 < 6 < 5 < 14 < 5 < 11 <6 < 10 < 15 <5 < 5 < 40 < 12 MW-DN-119-1 10/23/18 < 61 < 138 < 7 <6 < 13 < 6 < 15 < 8 < 10 < 10 <8 <6 < 30 < 10 MW-DN-119-1 11 /20/18 < 69 < 58 < 6 < 7 < 16 < 7 < 17 < 7 < 13 < 12 <7 <8 < 35 < 12 MW-DN-119-S 01/24/18 < 49 < 59 <5 < 5 < 12 < 5 < 11 < 6 < 9 < 14 <5 <6 < 30 < 11 MW-DN-119-S 06/15/18 < 44 < 91 <4 < 5 < 12 < 5 <7 < 5 < 9 < 15 <5 < 4 < 27 < 11 MW-DN-122-1 06/20/18 < 55 < 95 < 8 <6 < 13 < 8 < 15 < 7 < 13 < 13 < 7 <6 < 32 < 10 MW-DN-122-S 06/20/18 < 69 < 146 < 8 <7 < 14 < 6 < 16 <6 < 13 < 14 < 6 <7 < 37 < 13

TABLE 8-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 MW-DN-124-1 06/13/18 < 35 < 46 <4 < 3 <7 < 5 < 8 < 5 < 6 < 15 < 5 <4 < 27 < 11 MW-DN-124-1 11/08/18 < 37 < 105 < 5 <4 < 11 < 7 < 11 <6 < 12 < 14 < 6 < 5 < 29 < 11 MW-DN-124-S 06/13/18 < 42 < 39 <4 <4 < 9 < 3 < 8 <4 < 8 < 15 <4 <4 < 29 < 8 MW-DN-124-S 11/08/18 < 45 < 53 < 5 <5 < 12 < 5 < 10 <5 < 11 < 14 <6 <6 < 32 < 9 MW-DN-125-S 06/13/18 < 40 < 33 <4 <4 < 8 < 5 < 8 <4 < 8 < 14 <4 < 5 < 29 < 9 MW-DN-126-S 06/13/18 < 44 < 49 <4 < 5 < 11 < 4 < 9 < 5 < 9 < 15 < 6 <5 < 31 < 10 MW-DN-127-S 06/13/18 < 39 < 94 < 5 <4 < 10 < 5 < 9 < 5 < 8 < 14 < 5 <4 < 29 < 10 MW-DN-134-S 06/20/18 < 61 < 80 < 6 <7 < 18 < 7 < 14 <7 < 12 < 15 <6 <7 < 31 < 15 MW-DN-135-S 06/20/18 < 49 < 91 < 5 <5 < 14 < 6 < 13 < 7 < 9 < 12 <6 <6 < 31 < 10 MW-DN-136-S 06/20/18 < 66 < 167 < 8 < 8 < 16 < 7 < 16 < 8 < 10 < 15 < 8 <6 < 44 < 15 MW-DN-137-S 06/20/18 < 61 < 57 < 8 < 8 < 15 < 8 < 14 <7 < 11 < 14 < 9 <7 < 31 < 14 MW-DN-141-S 06/14/18 < 46 < 30 < 5 <5 < 11 < 5 < 9 < 5 < 9 < 15 < 5 <5 < 35 < 11 MW-DN-142-S 06/20/18 < 68 < 92 <6 < 8 < 17 < 9 < 14 <7 < 15 < 13 < 8 < 10 < 39 < 12 MW-DN-143-S 06/20/18 < 55 < 115 < 5 <6 < 14 < 4 < 11 < 5 <9 < 11 < 6 <6 < 32 < 8 MW-DN-144-S 06/20/18 < 80 < 184 < 9 < 9 < 18 < 10 < 19 < 9 < 13 < 14 < 9 < 9 < 38 <9 CJ I

co

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-233/234 U-235 U-238 Fe-55 Ni-63 DSP-106 01/31/18 < 198 < 4.1 DSP-107 01/25/18 < 192 < 4.0 DSP-151 01/25/18 < 168 < 4.0 MD-11 02/21/18 < 0.09 < 0.04 < 0.10 < 0.15 < 0.13 < 0.12 < 0.09 < 0.12 < 171 < 4.5 MD-11 11/08/18 < 0.02 < 0.02 < 0.05 < 0.03 < 0.03 < 0.11 < 0.09 < 0.11 < 162 < 4.8 MW-DN-101-1 01/24/18 < 0.11 < 0.04 < 0.15 < 0.10 < 0.06 0.39 +/- 0.17 < 0.07 < 0.15 < 132 7.5 +/- 3.3 MW-DN-101-1 01/24/18 Reanalysis 1 7.2 +/- 3.7 MW-DN-101-1 01/24/18 Reanalysis 2 6.2 +/- 3.3 MW-DN-101-1 02/23/18 < 0.12 < 0.02 < 0.09 < 0.10 < 0.07 < 0.06 < 0.15 < 0.08 < 195 9.6 +/- 2.8 MW-DN-101-1 06/14/18 < 0.08 < 0.04 < 0.02 < 0.06 < 0.10 0.46 +/- 0.19 < 0.11 < 0.12 < 98 6.7 +/- 2.7 MW-DN-101-1 09/18/18 < 0.28 < 0.10 < 0.10 < 0.07 < 0.11 0.44 +/- 0.17 < 0.05 0.33 +/- 0.14 < 136 17.4 +/- 2.9 MW-DN-101-1 09/18/18 Recount 16.2 +/- 3.4 MW-DN-101-1 09/18/18 Reanalysis 16.5 +/- 3.4 Ill MW-DN-101-1 11/07/18 < 0.18 < 0.13 < 0.16 < 0.19 < 0.09 0.26 +/- 0.12 < 0.02 0.18 +/- 0.10 < 177 12.4 +/- 2.9 I

tO MW-DN-101-S 01/24/18 < 182 < 4.4 MW-DN-105-S 01/25/18 < 91 < 3.8 MW-DN-118-S 01/25/18 < 175 < 4.1 MW-DN-119-1 01/24/18 < 0.07 < 0.04 < 0.05 < 0.11 < 0.08 < 0.09 < 0.08 < 0.11 < 193 35.6 +/- 3.6 MW-DN-119-1 02/23/18 48.7 +/- 5.9 MW-DN-119-1 06/15/18 < 0.14 < 0.08 < 0.08 < 0.12 < 0.17 < 0.14 < 0.12 < 0.09 < 83 26.2 +/- 3.0 MW-DN-119-1 09/19/18 32.2 +/- 4.3 MW-DN-119-1 10/23/18 < 0.07 < 0.05 < 0.05 < 0.18 < 0.14 < 0.02 < 0.03 < 0.04 < 194 29.7 +/- 3.2 MW-DN-119-1 11/20/18 < 0.08 < 0.07 < 0.15 < 0.06 < 0.17 < 0.02 < 0.05 < 0.02 < 185 17.6 +/- 3.0 MW-DN-119-S 01/24/18 < 123 < 4.2 MW-DN-124-1 06/13/18 < 0.09 < 0.03 < 0.09 < 0.11 < 0.07 < 0.11 < 0.04 < 0.09 < 198 < 4.5 MW-DN-124-S 06/13/18 < 0.12 < 0.02 < 0.07 < 0.09 < 0.12 < 0.03 < 0.12 < 0.13 < 196 < 4.2 BOLD Value = Unable to meet detection limit due to high solds content

TABLE B-11.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RES ULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 DSP-131 02/27/18 < 178 DSP-131 06/18/18 475 +/- 142 DSP-131 09/19/18 530 +/- 142 DSP-131 11/13/18 < 185 DSP-132 02/27/18 819 +/- 153 DSP-132 06/15/18 3600 +/- 421 DSP-132 09/19/18 370 +/- 135 DSP-133 02/27/18 < 180 DSP-133 06/15/18 < 194 DSP-133 09/21/18 < 194 DSP-133 11/13/18 < 190 SW-DN-101 02/27/18 < 180 SW-DN-101 06/19/18 518 +/- 141 SW-DN-101 09/21/18 1030 +/- 176 SW-DN-101 11/13/18 < 191 SW-DN-102 02/27/18 736 +/- 144 SW-DN-102 06/19/18 326 +/- 133 SW-DN-102 09/21/18 1130 +/- 184 SW-DN-102 11/13/18 1060 +/- 181 SW-DN-103 02/27/18 615 +/- 141 SW-DN-103 06/19/18 344 +/- 136 SW-DN-103 09/21/18 1140 +/- 188 SW-DN-103 11/13/18 1120 +/- 185 SW-DN-104 02/27/18 < 180 SW-DN-104 06/19/18 387 +/- 136 SW-DN-104 09/21/18 1160 +/- 188 SW-DN-104 11/13/18 1050 +/- 182 SW-DN-105 02/27/18 < 182 SW-DN-105 06/19/18 349 +/- 134 SW-DN-105 09/21/18 1240 +/- 197 SW-DN-105 11/13/18 976 +/- 172 SW-DN-106 02/27/18 661 +/- 142 SW-DN-106 06/19/18 719 +/- 153 SW-DN-106 09/21/18 1060 +/- 180 SW-DN-106 11/13/18 < 197 8-10

TABLE B-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 DSP-131 06/18/18 < 68 < 45 < 8 <7 < 13 < 7 < 13 < 7 < 11 < 15 < 7 <7 < 38 <8 DSP-132 06/15/18 < 46 < 57 < 5 < 5 < 9 < 5 <8 < 5 < 11 < 14 <6 <6 < 35 <7 DSP-133 06/15/18 < 43 < 113 < 6 < 5 < 12 < 7 < 9 < 6 < 9 < 13 <6 < 6 < 31 < 11 SW-DN-101 06/19/18 < 38 < 76 <4 <4 < 9 <5 < 10 < 5 < 8 < 10 <5 < 5 < 24 < 8 SW-DN-102 06/19/18 < 22 < 50 < 3 < 3 < 6 < 3 < 6 < 3 <5 <6 < 3 <3 < 15 <5 SW-DN-103 06/19/18 < 24 < 61 < 3 < 3 <5 < 3 < 6 < 3 < 5 < 6 < 3 <3 < 14 <5 SW-DN-104 06/19/18 < 55 < 117 < 5 < 7 < 15 <7 < 13 < 8 < 10 < 11 < 8 <7 < 29 < 10 SW-DN-105 06/19/18 < 57 < 45 <6 < 6 < 10 < 5 < 13 < 7 < 12 < 15 <7 <7 < 31 < 10 SW-DN-106 06/19/18 < 25 < 52 < 3 <3 < 6 < 3 < 5 < 3 < 5 < 6 <3 <3 < 15 < 5 OJ I

TABLE B-111.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED IN THE VICINITY OF DRESDEN NUCLEAR POWER STATION, 2018 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 FW-1 06/12/18 < 193 FW-10 06/12/18 < 193 FW-11 06/12/18 < 196 FW-12 06/02/18 < 196 8-12