Text

Enclosure 5 - Crystal River, Unit 3, 2025 Groundwater Characterization Report
	ML25288A007
Person / Time
Site:	Crystal River
Issue date:	10/15/2025
From:	Van Noordennen M; ADP CR3, Haley & Aldrich
To:	; Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
Shared Package
ML25288A001	List: 3F1025-01, Enclosure 19 - Crystal River, Unit 3, Evaluation of Soil Background Concentrations, ADPCR3, 2025; ML25288A002; ML25288A004; ML25288A005; ML25288A006; ML25288A007; ML25288A008; ML25288A014; ML25288A015; ML25288A016; ML25288A017; ML25288A018; ML25288A019; ML25288A020; ML25288A021; ML25288A022; ML25288A023; ML25288A024; ML25288A025;
References
	3F1025-01 134300-015
	Download: ML25288A007 (1)
	v • d • e

ENCLOSURE 5 Crystal River Unit 3 Nuclear Generating Plant Docket Nos. 50-302 / 72-1035 Operating License DPR-72 2025 Radiological Groundwater Characterization Report Begins On Next Page lef 3F1025-01 / Enclosure 5

www.haleyaldrich.com RADIOLOGICAL GROUNDWATER CHARACTERIZATION REPORT CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA by Haley & Aldrich, Inc.

Rocky Hill, Connecticut for ADP CR3 Crystal River, Florida File No. 134300-015 May 2025 3F1025-01 / Enclosure 5 / Page 1 of 83

HALEY & ALDRICH, INC.

100 CORPORATE PLACE SUITE 105 ROCKY HILL, CT 06067 860.282.9400 www.haleyaldrich.com SIGNATURE PAGE FOR RADIOLOGICAL GROUNDWATER CHARACTERIZATION REPORT CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA PREPARED FOR ADP CR3 CRYSTAL RIVER, FLORIDA PREPARED BY:

Miles van Noordennen Senior Technical Specialist Haley & Aldrich, Inc.

REVIEWED AND APPROVED BY:

Elida Danaher Senior Technical Specialist Haley & Aldrich, Inc.

Nadia Glucksberg Principal Consultant Haley & Aldrich, Inc.

3F1025-01 / Enclosure 5 / Page 2 of 83

Table of Contents Page List of Tables iv List of Figures iv List of Appendices iv 1.

Introduction 1

1.1 PURPOSE 1

1.2 SITE BACKGROUND 1

1.3 REGULATORY FRAMEWORK 1

1.3.1 Nuclear Regulatory Commission 1

2.

Physical Setting 2

2.1 TOPOGRAPHY 2

2.2 GEOLOGY 2

2.3 HYDROGEOLOGY 4

2.4 SURFACE WATER 4

3.

Groundwater Monitoring Programs 5

3.1 OVERVIEW 5

3.2 REMP SAMPLING PROGRAM 5

3.3 GROUNDWATER PROTECTION PROGRAM 5

4.

Groundwater Analytical Results 6

References 7

3F1025-01 / Enclosure 5 / Page 3 of 83

iv List of Tables Table No.

Title 1

Monitoring Well Construction Details 2

REMP Groundwater Analytical Data Summary - 2020 through 2024 3

GPP Groundwater Analytical Data Summary - 2007 through 2024 List of Figures Figure No.

Title 1

Project Locus 2

Site Plan 3

Monitoring Well Locations 4

Groundwater Sample Results List of Appendices Appendix Title A

CR3 Groundwater Flow Study Summary Report (GHS) 3F1025-01 / Enclosure 5 / Page 4 of 83

1 1.

Introduction On behalf of Accelerated Decommissioning Partners, LLC (ADP), Haley & Aldrich, Inc. (Haley & Aldrich) has prepared this Radiological Groundwater Characterization Report for the former Crystal River Nuclear Plant Unit 3 (CR3), located at 15485 West Power Line Road, Crystal River, Florida (Figure 1).

1.1 PURPOSE In accordance with the Off-Site Dose Calculation Manual (ODCM), CR3 instituted a Radiological Environmental Monitoring Program (REMP) beginning in 1977, just before reaching criticality. As part of this program, groundwater samples are collected and analyzed for radiological constituents. In addition to groundwater sampling required by the REMP and following the Nuclear Energy Institute (NEI) guidelines for groundwater protection (NEI, 2007), an additional groundwater protection program (GPP) was established in 2007 to ensure timely detection of any inadvertent radiological releases to groundwater.

This report presents the results of groundwater samples collected under the REMP during the last five years, as well as all results from samples collected under the GPP following the NEI guidance.

1.2 SITE BACKGROUND CR3 is a single-unit pressurized water reactor (PWR) that is co-located at the 5,100-acre Crystal River Energy Complex (CREC). Commercial operation began in March 1977, and in February 2013, the owner of the facility, Duke Energy Florida, LLC (DEF), announced that CR3 would be permanently shut down.

The reactor was placed into SAFSTOR at that time. However, DEF has contracted ADP to complete decommissioning activities, which are currently underway with the goal of achieving license termination and site closure by 2027.

1.3 REGULATORY FRAMEWORK As ADP works toward closure of the CR3 site, there are multiple potential regulatory stakeholders. The Nuclear Regulatory Commission (NRC) is the primary stakeholder for license termination. However, it is recognized that the Florida Department of Environmental Protection (FDEP) and the United States Environmental Protection Agency (USEPA) may also have jurisdiction over the groundwater if it has been impacted by non-radiological historic site operations. For the purposes of this report, the NRC is the regulatory agency of note for radiological groundwater programs.

Below is a brief description of the regulatory requirements for the NRC.

1.3.1 Nuclear Regulatory Commission All radiological cleanup activities will be completed under the regulatory authority of the NRC.

Remediation of environmental media will meet the NRC dose-based criteria with a goal of also meeting the criteria presented in the Memorandum of Understanding between the USEPA and NRC, signed 9 October 2002.

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2

2.

Physical Setting CR3 is located at the CREC, situated on Floridas Gulf Coast, about 85 miles north of Tampa, on Crystal Bay, a shallow embayment of the Gulf of Mexico (Figure 1). CREC is home to two retired coal-fired units, two operational coal-fired units, a natural gas-fired combined-cycle plant, and CR3. Of the 5,100-acre CREC site, 4,738 acres are within the Controlled Area and under the jurisdiction of the 10 Code of Federal Regulations (CFR) Part 50 License.

In January 2019, DEF submitted a request to the NRC for the release of approximately 4,738 acres of non-radiologically impacted land from the Part 50 License, leaving approximately 884 acres under the Part 50 License. This request was approved by the NRC on 2 January 2020. The CR3 site boundary comprises the 27-acre footprint of the facility, as well as approximately 857 acres of the developed portions of the CREC coal-fired plants (Figure 2).

2.1 TOPOGRAPHY The site is adjacent to the Gulf of Mexico, situated about midway between the mouths of the Withlacoochee and Crystal Rivers. The region is generally characterized by gradually rising terrain from mangrove swamp and marshland at the coast to gently rolling hills approximately 16 miles inland to the east. Prior to development, the site primarily consisted of hardwood hammock forest and marshland (United States Atomic Energy Commission, 1973). The entire site area is of very low relief and is located within the Terraced Coastal Lowlands of the Coastal Plain of West Florida. Elevations mentioned hereafter are referenced to the Florida Power Corporations Plant Datum (mean Gulf low water level equals plant datum 88 feet) (RSCS, 2016).

The western portion of the site is located within the coastal swamps. This area had been interpreted as relict, drowned karst topography, where insufficient sand is available to form beaches. The karst terrain was developed through the dissolution of the underlying limestone and dolomite resulting in numerous swamps, lakes, and sinkholes (GHS, 2017).

The entire power block area of CR3 is constructed on a berm, approximately 21 feet higher than the surrounding facilities. The berm provides flood protection against storm surge and waves that would result from the maximum probable storm.

2.2 GEOLOGY Regionally, the CREC lies within the Coastal Swamps physiographic region and near the boundary of the Gulf Coastal Lowland physiographic region. The general hydrogeologic units that form the hydrogeologic framework in the region include the discontinuous, siliciclastic aquifer (that has previously been referred to as the Surficial Aquifer System [SAS]), and the limestone and dolostone of the Upper Floridan Aquifer (UFA) system.

The SAS is characterized as undifferentiated, with a discontinuous veneer of sands, clayey sands, and shells. Thicknesses vary considerably due to the irregular surface of the underlying limestone. In the vicinity of the site, the UFA is comprised of (in descending order) the Suwannee Limestone, the Ocala Group Limestone (including the Crystal River, Williston, and Inglis Formations), and the Avon Park Limestone.

3F1025-01 / Enclosure 5 / Page 6 of 83

3 Soil borings previously completed at the site indicate three geologic and hydrogeologic units are present. These units, in order of increasing depth below land surface (bls), are summarized below.

Undifferentiated Surficial Deposits (USDs) - The USDs consist of a brown sandy clay with muck and occasional fill, ranging in thickness from 0 to 20 feet bls (Environmental Science and Engineering, Inc. [ESE], 1981 and Florida Testing Laboratories, Inc. [FTL], 1972). The thickness of the USDs is variable as a result of the irregular surface of the underlying limestone. Due to the limited extent of the USDs, the SAS is only locally present at the CREC where saturated unconsolidated sediments are present.

Inglis Formation of the Ocala Group - Encountered between land surface and 20 feet bls, this white, fossiliferous, and friable limestone is the uppermost hydrogeologic unit of the UFA. The Inglis Formation is reported to be cavernous with solution channels and cavities. Permeable zones within the Inglis Formation are present at depths of less than 30 feet bls and between 40 and 60 feet bls (the base of the Inglis Formation). The upper permeable zone was identified as the more transmissive zone at the site (ESE, 1981). Water levels in monitoring wells with documented void spaces and solution cavities had a subdued response to external stresses, such as rain events and tidal fluctuations, indicating an increased permeability (ESE, 1981).

Avon Park Formation - Encountered between 45 and 70 feet bls, the Avon Park Formation consists of an occasionally dolomitized limestone and well-indurated limestone (ESE, 1981). The Avon Park Formation was noted by an abrupt increase in hardness and numerous small voids (ESE, 1981). The Avon Park Formation is the formation utilized for water supply for CREC operations.

The geology at CR3, and specifically the elevated area where CR3 is constructed, is made up of fill.

Outside of this area, a layer of surface fills averaging 3 to 5 feet thick covers the remaining portions of the site. Below the fill, native soil consists of thinly laminated, organic sandy silts and clays, interspersed with the Pamlico Terrace Formation, a Pleistocene marine deposit. These deposits vary in thickness but average approximately 4 feet across the site. Beneath these deposits lies a lime-rich soil unit originating from the decomposition of the underlying bedrock.

Bedrock at the site is encountered at approximately 20 feet bls (outside the CR3 elevated areas) and consists of two distinct Eocene formations made of biogenic carbonates. The upper-most member, the Inglis Member of the Moody Branch Formation, overlies an unconformity consisting of dense silt, sands, and organic clays of variable thickness which represent an erosional surface known as the Jackson-Claiborne Unconformity. The surface is comprised of materials derived, in part, from reworked residual soils, formed from the underlying carbonate sequence (Avon Park Formation). The unconformity can be represented as an undulatory surface ranging from an elevation of -10 feet to an elevation of +20 feet (DEF, 2018).

The carbonate rocks beneath the site have been fractured in response to the Ocala Uplift, leaving the rocks susceptible to dissolution via the infiltration of rainwater. This is also referred to as a karst system.

Subsurface data acquired from the exploration and grouting of the foundation for Crystal River Unit 2 show that the dissolution is most prevalent in the first 100 feet of section bls (RSCS, 2016).

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4 2.3 HYDROGEOLOGY The site is located on the western coast of Florida, near the Gulf of Mexico. Groundwater at the site occurs under both unconfined (i.e., water table) and confined conditions. Groundwater occurs under water table conditions with levels ranging from approximately 5.5 to 9 ft bls (outside the CR3 elevated areas). The direction of groundwater flow is generally to the west-southwest, toward the Gulf of Mexico.

The upper zone of the Floridan Aquifer is highly permeable, while the unfractured limestone that separates the upper and lower zones is much less permeable. The lower zone (40 to 60 feet bls) contains smaller voids created by dissolution that are not as transmissive as the upper zone. There is a general upward flow gradient in the Floridan Aquifer at the site.

In 2016, GHS conducted a detailed groundwater flow study for the area surrounding CR3 on behalf of DEF. The purpose of the study was to document groundwater flow patterns across the site and determine if recent construction activities (namely the independent spent fuel storage installation

[ISFSI] pad) had altered the flow. The study included a set of water level maps documenting groundwater flow directions at the peak and ebb of typical tidal cycles and evaluated the potential vertical component due to groundwater mounding caused by subsurface barriers. Multiple groundwater elevation maps were prepared for comparison and include the highest high tide, average tide, and the lowest of low tides. Results of the study were consistent with previous studies and expected patterns.

Groundwater originating in the eastern half of the CREC site generally flows toward the west-southwest, with the primary receiving water bodies being the intake/discharge canals and the wetlands proximal to the Gulf of Mexico. Localized groundwater flow directions beneath and around CR3 are generally west-southwest in both shallow and deep zones of the aquifer and did not appear to have been altered by construction activities. Hydraulic conductivity of the aquifer is relatively high (approximately 1,000 feet/day) (GHS, 2017). This data was also summarized in the 2018 Annual Groundwater Contour Report, published by Geosyntec Consultants, Inc (Geosyntec Consultants, Inc., 2018).

2.4 SURFACE WATER The major surface water bodies in the vicinity of the site include the intake and discharge canals, as well as the Withlacoochee River, the Homosassa River, and the Crystal River. The Withlacoochee River has an approximately 2,000 square mile drainage area at its entrance into the Gulf of Mexico. The site is located approximately 3.8 miles south of the mouth of the Withlacoochee and a similar distance north of the mouth of the Crystal River, a much smaller river with primarily artesian spring discharges.

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5

3.

Groundwater Monitoring Programs 3.1 OVERVIEW Groundwater at the site has been characterized for physical properties (i.e., flow direction and hydraulic conductivity) under the REMP and the GPP as well as non-radiological characterization activities, including a previous groundwater flow study completed in 2016 by GHS Environmental which is attached to this report (please note that links within the document that previously provided access to raw groundwater elevation data/transducer files are no longer active). With these programs for both radiological and non-radiological requirements, a total of 39 wells are currently in service across the site, with a large concentration of wells located on the downgradient or west side of the plant. Current monitoring well locations are shown on Figure 3. Well completion details for these existing wells are provided in Table 1.

This report includes the summary of quarterly REMP sampling completed in 2020 through 2024 as well as quarterly tritium sampling, beginning in 2007. These programs are discussed below.

3.2 REMP SAMPLING PROGRAM As part of the REMP, 13 monitoring wells around the perimeter of the CR3 Protected Area (PA) are sampled quarterly and analyzed for tritium and gamma-emitting radionuclides. Sampling is performed by the Florida Department of Health, Bureau of Radiation Control. The State also performs the required analyses and participates in the Interlaboratory Comparison Program. Analytical results for each quarterly event completed from 2020 through 2024 are summarized, by well, on Table 2 and discussed in the next section.

3.3 GROUNDWATER PROTECTION PROGRAM As part of the GPP, 15 monitoring wells are currently being sampled to monitor for any potential radiological releases. GPP sampling is performed by the Florida Department of Health, Bureau of Radiation Control. Samples have been collected quarterly at a minimum, although some locations have been sampled more frequently as site conditions warrant. Groundwater samples have been analyzed for tritium. Tritium results for all samples collected since 2007 are summarized, by well, on Table 3 and discussed in the next section.

3F1025-01 / Enclosure 5 / Page 9 of 83

6

4.

Groundwater Analytical Results Groundwater samples from the 15 GPP wells have been collected quarterly and submitted for tritium analysis beginning in February 2007. Samples have also been collected and submitted for analysis of gamma isotopes at 13 of the 15 monitoring well locations. All analytical results are provided in Table 2 and Table 3, respectively.

Data collected as part of the GPP and REMP do not indicate that groundwater has been significantly impacted by plant-related radiological isotopes. With the exception of naturally occurring potassium-40, no other gamma emitters have been detected in groundwater samples collected on site from any of the 13 monitoring locations under the REMP since 2020.

Tritium detections have been far below the drinking water standard of 20,000 picoCuries per liter (pCi/L). Of the 15 monitoring wells sampled for tritium under the GPP, only two wells (CR3-5 and MWC-

27) have shown any elevated detections above 1,000 pCi/L over the course of the sampling program between 2007 and 2024. The highest reported tritium concentration at CR3-5 was 1,967 pCi/L from the sample collected in May 2009. Since then, the tritium concentration has trended downward, with all results less than 300 pCi/L since 2020, with the exception of the October 2024 result of 441 pCi/L. The highest reported tritium concentration at MWC-27 was 1,280 pCi/L from the sample collected in May 2007. Samples collected from MWC-27 have not detected tritium since 2016. These wells are highlighted on Figure 4.

The highest detection of tritium in any of the remaining 13 monitoring wells was 771 pCi/L, from the sample collected at CR3-7 in May 2007. The sample collected from MWC-1F2 in May 2007 contained a tritium concentration of 665 pCi/L. No other monitoring wells have had any tritium results exceed 400 pCi/L.

3F1025-01 / Enclosure 5 / Page 10 of 83

7 References

1.

DEF, 2018. Defueled Safety Analysis Report, Revision 002. October 2018.

2.

ESE, 1981. Baseline Hydrology Study for Crystal River Units 4 and 5 Ash Landfill. Florida Power Corporation, Crystal River, Florida.

3.

FTL, 1972. Report of Soil Test Borings and Permeability Test Results in Holding Pond Areas of Crystal River and Inglis Power Plants.

4.

GHS, 2017. 2016 CR3 Groundwater Flow Study Summary Report. April 2017.

5.

NEI, 2007. Industry Groundwater Protection Initiative - Final Guidance Document. August 2007.

6.

RSCS, 2016. Historical Site Assessment for Crystal River 3. June 2016.

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TABLES 3F1025-01 / Enclosure 5 / Page 12 of 83

PAGE 1 OF 1 RADIOLOGICAL GROUNDWATER CHARACTERIZATION REPORT Well ID Installation Date Total Boring Depth (ft bgs)

Screened Interval (ft bgs)

Reference Elevation (ft)

CCRW-2 12.09 CCRW-3 21.30 CCRW-7 9.45 CCRW-21 CCRW-29 CR3-1S 30 20-30*

8.07 CR3-1D 70 60-70*

8.23 CR3-2 30 20-30*

8.25 CR3-3S 30 20-30*

8.62 CR3-3D 75 65-75*

7.9 CR3-4 30 20-30*

9.05 CR3-5 30 20-30*

9.08 CR3-6S 25 15-25*

10.22 CR3-6D 77 67-77*

10.18 CR3-7 30 20-30*

8.87 CR3-8 30 20-30*

10.51 CR3-9 30 20-30*

9.96 CR3-10 30 20-30*

8.72 CR3-13 35 25-35*

26.55 CR3-14 33.5 23.5-33.5*

26.36 CR3-15 35 25-35*

MW-01 6/25/2020 34 24-34 27.90 MW-02 6/10/2020 14 4-14 8.76 MW-03 6/26/2020 34 24-34 27.94 MW-04 6/30/2020 14 4-14 8.03 MW-07 6/17/2020 25 15-25 6.46 MWC-1 7.32 MWC-1F2 17.5 7.5-17.5*

11.79 MWC-7R 8.62 MWC-16 33 23-33*

13.99 MWC-21R 10.39 MWC-27 13 3-13*

11.31 MWC-29 11.72 MW-POS-22 MW-POS-24 TWI-1R TWI-2R TWI-3 TWI-4 Notes:

--: Not determined/unknown ft bgs: Feet below ground surface Reference Elevation: Elevation from top of well PVC riser,

Assumption that the Well Screen is the bottom 10' of Monitoring Well, boring logs for existing wells unable to be located TABLE 1 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA MONITORING WELL CONSTRUCTION DETAILS HALEY & ALDRICH, INC.

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PAGE 1 OF 4 TABLE 2 REMP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2020 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium Potassium-40 Manganese-54 Cobalt-58 Iron-59 Cobalt-60 Zinc-65 Zirconium/

Niobium-95 Cesium-134 Cesium-137 Barium/

Lanthanum-140 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L CR3-1D CR3-1D-20200123 01/23/2020 139 U 43 U 3 U 3 U 7 U 4 U 7 U 5 U 3 U 4 U 5 U CR3-1D CR3-1D-20200427 04/27/2020 145 U 50 U 4 U 4 U 7 U 3 U 9 U 6 U 3 U 4 U 12 U CR3-1D CR3-1D-20200720 07/20/2020 139 U 0 U 4 U 4 U 7 U 4 U 7 U 7 U 4 U 4 U 4 U CR3-1D CR3-1D-20201006 10/06/2020 137 U 53 U 3 U 3 U 7 U 4 U 10 U 6 U 4 U 4 U 4 U CR3-1D CR3-1D-20210127 01/27/2021 133 U 74 U 4 U 4 U 7 U 4 U 8 U 6 U 4 U 4 U 7 U CR3-1D CR3-1D-20210520 05/20/2021 141 U 50 U 3 U 4 U 8 U 3 U 6 U 5 U 3 U 4 U 6 U CR3-1D CR3-1D-20210928 09/28/2021 136 U 80 U 4 U 4 U 7 U 4 U 10 U 7 U 4 U 4 U 8 U CR3-1D CR3-1D-20211228 12/28/2021 132 U 46 U 4 U 3 U 7 U 3 U 9 U 6 U 4 U 4 U 4 U CR3-1D CR3-1D-20220425 04/25/2022 137 U 57 U 4 U 5 U 5 U CR3-1D CR3-1D-20220715 07/15/2022 132 U 84 U 6 U 5 U 5 U CR3-1D CR3-1D-20221021 10/21/2022 129 U 50 U 4 U 4 U 3 U CR3-1D CR3-1D-20230127 01/27/2023 137 U 55 U 4 U 4 U 5 U CR3-1D CR3-1D-20230412 04/12/2023 137 U 44 U 4 U 3 U 4 U CR3-1D CR3-1D-20230727 07/27/2023 140 U 50 U 4 U 4 U 4 U CR3-1D CR3-1D-20231016 10/16/2023 139 U 53 U 4 U 4 U 4 U CR3-1D CR3-1D-20240125 01/25/2024 135 U 84 U 5 U 5 U 5 U CR3-1D CR3-1D-20240417 04/17/2024 137 U 55 U 3 U 4 U 4 U CR3-1D CR3-1D-20240702 07/02/2024 141 U 46 U 3 U 3 U 3 U CR3-1D CR3-1D-20241016 10/16/2024 142 U 56 U 3 U 4 U 4 U CR3-1S CR3-1S-20200123 01/23/2020 139 U 40 U 3 U 4 U 7 U 3 U 8 U 6 U 3 U 4 U 5 U CR3-1S CR3-1S-20200427 04/27/2020 145 U 46 U 3 U 4 U 7 U 3 U 8 U 6 U 4 U 4 U 12 U CR3-1S CR3-1S-20200720 07/20/2020 137 U 76 U 4 U 4 U 7 U 4 U 9 U 7 U 4 U 4 U 6 U CR3-1S CR3-1S-20201006 10/06/2020 137 U 34 U 3 U 3 U 6 U 3 U 9 U 6 U 4 U 4 U 4 U CR3-1S CR3-1S-20210127 01/27/2021 133 U 73 U 4 U 4 U 8 U 4 U 9 U 6 U 4 U 4 U 5 U CR3-1S CR3-1S-20210520 05/20/2021 139 U 69 U 4 U 4 U 8 U 3 U 7 U 7 U 3 U 3 U 6 U CR3-1S CR3-1S-20210928 09/28/2021 136 U 74 U 4 U 4 U 8 U 4 U 8 U 7 U 4 U 4 U 10 U CR3-1S CR3-1S-20211228 12/28/2021 132 U 42 U 4 U 4 U 6 U 4 U 8 U 7 U 4 U 4 U 4 U CR3-1S CR3-1S-20220425 04/25/2022 137 U 46 U 4 U 3 U 4 U CR3-1S CR3-1S-20220715 07/15/2022 132 U 90 U 6 U 5 U 5 U CR3-1S CR3-1S-20221021 10/21/2022 129 U 64 U 5 U 5 U 5 U CR3-1S CR3-1S-20230127 01/27/2023 137 U 66 U 5 U 5 U 5 U CR3-1S CR3-1S-20230412 04/12/2023 148 U 45 U 4 U 4 U 4 U CR3-1S CR3-1S-20230727 07/27/2023 140 U 67 U 4 U 5 U 6 U CR3-1S CR3-1S-20231016 10/16/2023 138 U 42 U 4 U 4 U 4 U CR3-1S CR3-1S-20240125 01/25/2024 137 U 42 U 3 U 3 U 3 U CR3-1S CR3-1S-20240417 04/17/2024 138 U 49 U 4 U 4 U 4 U CR3-1S CR3-1S-20240702 07/02/2024 136 U 56 U 4 U 4 U 4 U CR3-1S CR3-1S-20241016 10/16/2024 142 U 50 U 3 U 4 U 3 U CR3-2 CR3-2-20200123 01/23/2020 139 U 43 U 3 U 3 U 6 U 3 U 8 U 6 U 3 U 4 U 6 U CR3-2 CR3-2-20200427 04/27/2020 134 U 47 U 4 U 4 U 7 U 4 U 9 U 6 U 4 U 4 U 13 U CR3-2 CR3-2-20200720 07/20/2020 137 U 83 U 4 U 4 U 7 U 5 U 9 U 7 U 3 U 4 U 5 U CR3-2 CR3-2-20201006 10/06/2020 137 U 51 U 3 U 4 U 8 U 4 U 9 U 7 U 4 U 5 U 4 U CR3-2 CR3-2-20210127 01/27/2021 133 U 83 U 4 U 4 U 7 U 4 U 10 U 7 U 4 U 5 U 6 U CR3-2 CR3-2-20210520 05/20/2021 135 U 47 U 4 U 4 U 7 U 4 U 8 U 7 U 4 U 3 U 5 U CR3-2 CR3-2-20210928 09/28/2021 136 U 78 U 4 U 4 U 8 U 5 U 9 U 7 U 4 U 5 U 9 U CR3-2 CR3-2-20211228 12/28/2021 132 U 58 U 4 U 4 U 8 U 4 U 9 U 6 U 4 U 4 U 4 U CR3-2 CR3-2-20220425 04/25/2022 137 U 48 U 4 U 3 U 4 U CR3-2 CR3-2-20230131 01/31/2023 137 U 46 U 4 U 4 U 5 U CR3-2 CR3-2-20230727 07/27/2023 140 U 70 U 6 U 5 U 6 U CR3-2 CR3-2-20231016 10/16/2023 138 U 72 U 6 U 6 U 5 U CR3-2 CR3-2-20240125 01/25/2024 135 U 81 U 5 U 6 U 6 U CR3-2 CR3-2-20240417 04/17/2024 138 U 30 +/-14 4 U 4 U 5 U CR3-2 CR3-2-20240702 07/02/2024 136 U 52 U 4 U 4 U 4 U CR3-2 CR3-2-20241016 10/16/2024 142 U 81 U 5 U 5 U 5 U CR3-3D CR3-3D-20200123 01/23/2020 146 U 47 U 3 U 3 U 7 U 3 U 7 U 6 U 3 U 4 U 6 U CR3-3D CR3-3D-20200427 04/27/2020 136 U 0 U 3 U 3 U 7 U 3 U 8 U 5 U 3 U 4 U 7 U CR3-3D CR3-3D-20200720 07/20/2020 137 U 0 U 4 U 4 U 9 U 4 U 10 U 7 U 4 U 5 U 8 U CR3-3D CR3-3D-20201006 10/06/2020 137 U 71 U 4 U 4 U 7 U 4 U 8 U 6 U 4 U 4 U 7 U CR3-3D CR3-3D-20210127 01/27/2021 142 U 46 U 3 U 4 U 6 U 3 U 8 U 7 U 4 U 4 U 5 U CR3-3D CR3-3D-20210520 05/20/2021 139 U 27 U 4 U 3 U 6 U 3 U 6 U 6 U 4 U 4 U 5 U CR3-3D CR3-3D-20210928 09/28/2021 136 U 85 U 5 U 5 U 10 U 5 U 11 U 8 U 5 U 5 U 11 U CR3-3D CR3-3D-20220104 01/04/2022 132 U 39 U 3 U 3 U 7 U 3 U 7 U 6 U 4 U 3 U 4 U CR3-3D CR3-3D-20220425 04/25/2022 140 U 54 +/-12 4 U 4 U 5 U CR3-3D CR3-3D-20220715 07/15/2022 132 U 82 U 7 U 6 U 5 U CR3-3D CR3-3D-20221021 10/21/2022 129 U 53 U 3 U 3 U 4 U CR3-3D CR3-3D-20230131 01/31/2023 137 U 93 U 6 U 5 U 5 U CR3-3D CR3-3D-20230412 04/12/2023 137 U 60 U 5 U 5 U 6 U CR3-3D CR3-3D-20230727 07/27/2023 141 U 89 U 7 U 6 U 7 U Location Sample Name Date Sampled HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 14 of 83

PAGE 2 OF 4 TABLE 2 REMP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2020 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium Potassium-40 Manganese-54 Cobalt-58 Iron-59 Cobalt-60 Zinc-65 Zirconium/

Niobium-95 Cesium-134 Cesium-137 Barium/

Lanthanum-140 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L Location Sample Name Date Sampled CR3-3D CR3-3D-20231016 10/16/2023 138 U 53 U 5 U 5 U 5 U CR3-3D CR3-3D-20240125 01/25/2024 133 U 43 U 3 U 3 U 3 U CR3-3D CR3-3D-20240417 04/17/2024 138 U 90 U 5 U 5 U 5 U CR3-3D CR3-3D-20240702 07/02/2024 141 U 82 U 5 U 4 U 5 U CR3-3D CR3-3D-20241016 10/16/2024 142 U 64 U 4 U 5 U 4 U CR3-3S CR3-3S-20200123 01/23/2020 139 U 42 U 3 U 3 U 7 U 3 U 6 U 6 U 3 U 3 U 5 U CR3-3S CR3-3S-20200427 04/27/2020 134 U 43 U 3 U 4 U 7 U 3 U 8 U 6 U 3 U 4 U 7 U CR3-3S CR3-3S-20200720 07/20/2020 137 U 74 U 4 U 4 U 8 U 4 U 9 U 8 U 4 U 5 U 7 U CR3-3S CR3-3S-20201006 10/06/2020 137 U 0 U 5 U 4 U 9 U 5 U 11 U 8 U 4 U 4 U 8 U CR3-3S CR3-3S-20210127 01/27/2021 133 U 42 U 3 U 4 U 8 U 3 U 8 U 7 U 3 U 4 U 5 U CR3-3S CR3-3S-20210520 05/20/2021 141 U 48 U 3 U 3 U 7 U 4 U 8 U 6 U 4 U 4 U 5 U CR3-3S CR3-3S-20210928 09/28/2021 136 U 73 U 3 U 4 U 7 U 4 U 9 U 7 U 4 U 4 U 6 U CR3-3S CR3-3S-20220104 01/04/2022 132 U 36 U 3 U 3 U 6 U 3 U 8 U 5 U 3 U 3 U 4 U CR3-3S CR3-3S-20220425 04/25/2022 137 U 47 U 3 U 3 U 4 U CR3-3S CR3-3S-20220715 07/15/2022 132 U 61 U 5 U 4 U 5 U CR3-3S CR3-3S-20221021 10/21/2022 129 U 86 U 6 U 5 U 6 U CR3-3S CR3-3S-20230131 01/31/2023 137 U 67 U 5 U 5 U 5 U CR3-3S CR3-3S-20230412 04/12/2023 148 U 43 U 4 U 4 U 4 U CR3-3S CR3-3S-20230727 07/27/2023 142 U 174 U 15 U 12 U 15 U CR3-3S CR3-3S-20231016 10/16/2023 138 U 70 U 5 U 6 U 6 U CR3-3S CR3-3S-20240125 01/25/2024 135 U 79 U 6 U 5 U 6 U CR3-3S CR3-3S-20240417 04/17/2024 135 U 38 U 3 U 4 U 4 U CR3-3S CR3-3S-20240702 07/02/2024 141 U 53 U 4 U 4 U 4 U CR3-3S CR3-3S-20241016 10/16/2024 142 U 84 U 5 U 5 U 6 U CR3-4 CR3-4-20200123 01/23/2020 138 U 47 U 4 U 4 U 8 U 4 U 9 U 6 U 4 U 4 U 5 U CR3-4 CR3-4-20200427 04/27/2020 134 U 52 U 4 U 4 U 7 U 4 U 10 U 7 U 4 U 4 U 8 U CR3-4 CR3-4-20200720 07/20/2020 137 U 69 U 4 U 4 U 8 U 4 U 8 U 7 U 4 U 4 U 6 U CR3-4 CR3-4-20201006 10/06/2020 137 U 73 U 4 U 5 U 8 U 4 U 11 U 8 U 4 U 5 U 10 U CR3-4 CR3-4-20210127 01/27/2021 133 U 42 U 4 U 3 U 7 U 3 U 8 U 6 U 4 U 4 U 5 U CR3-4 CR3-4-20210520 05/20/2021 141 U 53 U 4 U 4 U 7 U 4 U 11 U 7 U 4 U 5 U 5 U CR3-4 CR3-4-20210928 09/28/2021 136 U 54 U 4 U 4 U 8 U 4 U 11 U 7 U 5 U 5 U 4 U CR3-4 CR3-4-20220104 01/04/2022 132 U 53 U 4 U 4 U 9 U 4 U 11 U 7 U 5 U 5 U 5 U CR3-4 CR3-4-20220425 04/25/2022 133 U 52 U 4 U 4 U 5 U CR3-4 CR3-4-20220715 07/15/2022 132 U 73 U 5 U 6 U 6 U CR3-4 CR3-4-20221021 10/21/2022 129 U 44 U 3 U 4 U 3 U CR3-4 CR3-4-20230127 01/27/2023 138 U 59 U 4 U 4 U 5 U CR3-4 CR3-4-20230412 04/12/2023 137 U 68 U 5 U 6 U 6 U CR3-4 CR3-4-20230727 07/27/2023 140 U 64 U 5 U 5 U 5 U CR3-4 CR3-4-20231016 10/16/2023 138 U 60 U 4 U 5 U 5 U CR3-4 CR3-4-20240125 01/25/2024 133 U 47 U 4 U 3 U 4 U CR3-4 CR3-4-20240417 04/17/2024 135 U 45 U 4 U 3 U 4 U CR3-4 CR3-4-20240702 07/02/2024 136 U 60 U 4 U 4 U 4 U CR3-4 CR3-4-20241016 10/16/2024 142 U 71 U 6 U 4 U 5 U CR3-5 CR3-5-20200123 01/23/2020 204 55 U 4 U 4 U 7 U 3 U 9 U 6 U 4 U 4 U 6 U CR3-5 CR3-5-20200427 04/27/2020 268 61 U 4 U 4 U 6 U 4 U 10 U 7 U 4 U 4 U 9 U CR3-5 CR3-5-20200720 07/20/2020 202 75 U 5 U 4 U 7 U 4 U 8 U 7 U 4 U 4 U 7 U CR3-5 CR3-5-20201006 10/06/2020 236 67 U 5 U 5 U 8 U 4 U 11 U 7 U 5 U 4 U 11 U CR3-5 CR3-5-20210127 01/27/2021 203 26 U 4 U 3 U 7 U 4 U 9 U 6 U 4 U 5 U 4 U CR3-5 CR3-5-20210601 06/01/2021 200 50 U 3 U 4 U 7 U 4 U 9 U 6 U 4 U 4 U 4 U CR3-5 CR3-5-20210928 09/28/2021 160 58 U 4 U 4 U 8 U 4 U 9 U 6 U 5 U 5 U 5 U CR3-5 CR3-5-20220106 01/06/2022 171 27 U 4 U 4 U 8 U 5 U 11 U 7 U 5 U 5 U 5 U CR3-5 CR3-5-20220425 04/25/2022 137 U 68 +/- 9999 5 U 5 U 7 U CR3-5 CR3-5-20230127 01/27/2023 138 U 66 U 4 U 4 U 5 U CR3-5 CR3-5-20230412 04/12/2023 137 U 50 U 4 U 4 U 4 U CR3-5 CR3-5-20230727 07/27/2023 141 U 61 U 5 U 5 U 5 U CR3-5 CR3-5-20231016 10/16/2023 138 U 53 U 4 U 5 U 5 U CR3-5 CR3-5-20240125 01/25/2024 111 78 U 5 U 5 U 5 U CR3-5 CR3-5-20240417 04/17/2024 137 U 90 U 6 U 5 U 6 U CR3-5 CR3-5-20240702 07/02/2024 87 50 U 4 U 4 U 3 U CR3-5 CR3-5-20241016 10/24/2024 441 48 U 3 U 4 U 4 U CR3-6D CR3-6D-20200123 01/23/2020 139 U 82 U 7 U 7 U 13 U 6 U 14 U 10 U 6 U 5 U 10 U CR3-6D CR3-6D-20200427 04/27/2020 145 U 0 U 3 U 4 U 7 U 3 U 7 U 7 U 3 U 3 U 8 U CR3-6D CR3-6D-20200720 07/20/2020 204 46 3 U 4 U 7 U 4 U 8 U 6 U 4 U 4 U 6 U CR3-6D CR3-6D-20201006 10/06/2020 134 U 0 U 4 U 4 U 8 U 4 U 8 U 7 U 3 U 4 U 9 U CR3-6D CR3-6D-20210127 01/27/2021 133 U 36 U 3 U 3 U 7 U 4 U 7 U 5 U 4 U 4 U 4 U CR3-6D CR3-6D-20210609 06/09/2021 140 U 51 U 2 U 2 U 5 U 2 U 5 U 4 U 2 U 2 U 4 U CR3-6D CR3-6D-20220106 01/06/2022 133 U 32 U 4 U 3 U 7 U 3 U 8 U 6 U 4 U 4 U 4 U CR3-6D CR3-6D-20220425 04/25/2022 137 U 208 +/- 9999 5 U 5 U 5 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 15 of 83

PAGE 3 OF 4 TABLE 2 REMP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2020 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium Potassium-40 Manganese-54 Cobalt-58 Iron-59 Cobalt-60 Zinc-65 Zirconium/

Niobium-95 Cesium-134 Cesium-137 Barium/

Lanthanum-140 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L Location Sample Name Date Sampled CR3-6D CR3-6D-20221021 10/21/2022 129 U 62 U 6 U 5 U 6 U CR3-6D CR3-6D-20230127 01/27/2023 138 U 73 U 6 U 6 U 6 U CR3-6D CR3-6D-20230727 07/27/2023 140 U 82 U 6 U 6 U 6 U CR3-6D CR3-6D-20231016 10/16/2023 138 U 75 U 6 U 6 U 6 U CR3-6D CR3-6D-20240125 01/25/2024 133 U 54 +/- 18 5 U 5 U 5 U CR3-6D CR3-6D-20240418 04/18/2024 137 U 177 +/- 19 3 U 4 U 4 U CR3-6D CR3-6D-20240702 07/02/2024 141 U 193 +/- 27 4 U 5 U 4 U CR3-6D CR3-6D-20241016 10/16/2024 142 U 250 +/- 30 6 U 6 U 5 U CR3-6S CR3-6S-20200123 01/23/2020 139 U 105 U 5 U 6 U 15 U 6 U 13 U 10 U 6 U 7 U 10 U CR3-6S CR3-6S-20200427 04/27/2020 134 U 53 U 3 U 4 U 7 U 3 U 10 U 6 U 4 U 4 U 10 U CR3-6S CR3-6S-20200720 07/20/2020 137 U 46 U 3 U 4 U 8 U 3 U 6 U 5 U 3 U 3 U 5 U CR3-6S CR3-6S-20201006 10/06/2020 134 U 0 U 4 U 4 U 7 U 4 U 10 U 8 U 4 U 4 U 9 U CR3-6S CR3-6S-20210127 01/27/2021 134 49 U 4 U 3 U 7 U 4 U 10 U 7 U 4 U 4 U 4 U CR3-6S CR3-6S-20210609 06/09/2021 140 U 68 U 2 U 2 U 4 U 2 U 4 U 3 U 2 U 2 U 3 U CR3-6S CR3-6S-20220106 01/06/2022 133 U 29 U 4 U 3 U 6 U 3 U 7 U 7 U 3 U 3 U 4 U CR3-6S CR3-6S-20220425 04/25/2022 140 U 73 U 6 U 5 U 5 U CR3-6S CR3-6S-20221021 10/21/2022 129 U 97 U 6 U 5 U 6 U CR3-6S CR3-6S-20230127 01/27/2023 137 U 45 U 4 U 4 U 4 U CR3-6S CR3-6S-20230412 04/12/2023 137 U 37 U 4 U 3 U 4 U CR3-6S CR3-6S-20230727 07/27/2023 140 U 35 U 4 U 4 U 4 U CR3-6S CR3-6S-20231016 10/16/2023 138 U 65 U 6 U 6 U 6 U CR3-6S CR3-6S-20240125 01/25/2024 137 U 204 +/- 25 5 U 4 U 4 U CR3-6S CR3-6S-20240418 04/18/2024 137 U 73 U 6 U 6 U 5 U CR3-6S CR3-6S-20240702 07/02/2024 136 U 94 U 5 U 4 U 5 U CR3-6S CR3-6S-20241016 10/16/2024 142 U 54 U 5 U 4 U 4 U CR3-7 CR3-7-20200123 01/23/2020 146 U 71 U 6 U 5 U 9 U 7 U 15 U 11 U 5 U 7 U 10 U CR3-7 CR3-7-20200427 04/27/2020 145 U 94 U 7 U 7 U 11 U 6 U 13 U 11 U 6 U 7 U 12 U CR3-7 CR3-7-20200720 07/20/2020 137 U 0 U 3 U 3 U 6 U 4 U 6 U 7 U 3 U 4 U 6 U CR3-7 CR3-7-20201006 10/06/2020 134 U 67 U 5 U 4 U 9 U 4 U 9 U 7 U 4 U 4 U 10 U CR3-7 CR3-7-20210127 01/27/2021 133 U 50 U 3 U 4 U 6 U 4 U 9 U 7 U 4 U 4 U 4 U CR3-7 CR3-7-20210609 06/09/2021 139 U 57 U 4 U 4 U 7 U 4 U 11 U 7 U 4 U 5 U 4 U CR3-7 CR3-7-20220106 01/06/2022 133 U 51 U 4 U 4 U 7 U 4 U 10 U 6 U 4 U 4 U 4 U CR3-7 CR3-7-20220425 04/25/2022 140 U 90 U 6 U 4 U 5 U CR3-7 CR3-7-20220715 07/15/2022 136 U 64 U 5 U 5 U 4 U CR3-7 CR3-7-20221021 10/21/2022 129 U 85 U 6 U 5 U 4 U CR3-7 CR3-7-20230127 01/27/2023 138 U 45 U 4 U 4 U 4 U CR3-7 CR3-7-20230412 04/12/2023 137 U 50 U 4 U 4 U 4 U CR3-7 CR3-7-20230727 07/27/2023 140 U 56 U 4 U 5 U 5 U CR3-7 CR3-7-20231016 10/16/2023 138 U 52 U 5 U 5 U 5 U CR3-7 CR3-7-20240125 01/25/2024 135 U 61 U 5 U 4 U 4 U CR3-7 CR3-7-20240418 04/18/2024 137 U 80 U 5 U 5 U 5 U CR3-7 CR3-7-20240813 08/13/2024 138 U 86 U 5 U 6 U 6 U CR3-7 CR3-7-20241016 10/16/2024 142 U 70 U 6 U 5 U 6 U CR3-8 CR3-8-20200123 01/23/2020 139 U 101 U 7 U 7 U 16 U 7 U 14 U 11 U 6 U 8 U 12 U CR3-8 CR3-8-20200427 04/27/2020 145 U 106 U 7 U 6 U 14 U 8 U 15 U 11 U 6 U 7 U 11 U CR3-8 CR3-8-20200720 07/20/2020 142 U 52 U 4 U 3 U 8 U 3 U 8 U 7 U 4 U 4 U 6 U CR3-8 CR3-8-20201216 12/16/2020 139 U 62 U 5 U 5 U 8 U 5 U 15 U 8 U 5 U 6 U 5 U CR3-8 CR3-8-20210127 01/27/2021 137 U 61 U 5 U 4 U 9 U 4 U 14 U 8 U 5 U 6 U 5 U CR3-8 CR3-8-20210609 06/09/2021 140 U 27 U 1 U 1 U 3 U 1 U 3 U 2 U 2 U 2 U 2 U CR3-8 CR3-8-20220106 01/06/2022 133 U 56 U 4 U 4 U 8 U 5 U 11 U 7 U 5 U 5 U 5 U CR3-8 CR3-8-20220425 04/25/2022 140 U 86 U 6 U 4 U 6 U CR3-8 CR3-8-20220715 07/15/2022 132 U 53 U 4 U 4 U 4 U CR3-8 CR3-8-20230127 01/27/2023 138 U 65 U 7 U 6 U 7 U CR3-8 CR3-8-20230412 04/12/2023 137 U 53 U 4 U 4 U 4 U CR3-8 CR3-8-20230727 07/27/2023 140 U 59 U 5 U 4 U 4 U CR3-8 CR3-8-20231016 10/16/2023 138 U 68 U 6 U 6 U 7 U CR3-8 CR3-8-20240125 01/25/2024 137 U 65 U 4 U 4 U 4 U CR3-8 CR3-8-20240702 07/02/2024 141 U 58 U 3 U 4 U 3 U CR3-8 CR3-8-20241028 10/28/2024 142 U 95 U 6 U 6 U 6 U CR3-9 CR3-9-20200123 01/23/2020 146 U 117 U 6 U 7 U 12 U 6 U 14 U 10 U 6 U 6 U 9 U CR3-9 CR3-9-20200427 04/27/2020 136 U 0 U 5 U 5 U 11 U 7 U 13 U 11 U 6 U 6 U 13 U CR3-9 CR3-9-20200701 07/01/2020 137 U CR3-9 CR3-9-20200720 07/20/2020 137 U 54 U 3 U 3 U 7 U 3 U 8 U 6 U 4 U 4 U 5 U CR3-9 CR3-9-20201216 12/16/2020 139 U 59 U 4 U 4 U 7 U 3 U 11 U 7 U 4 U 5 U 4 U CR3-9 CR3-9-20210127 01/27/2021 133 U 55 U 4 U 4 U 6 U 4 U 9 U 6 U 4 U 4 U 2 U CR3-9 CR3-9-20210520 05/20/2021 141 U 55 U 4 U 4 U 7 U 4 U 10 U 6 U 4 U 4 U 4 U CR3-9 CR3-9-20210928 09/28/2021 136 U 53 U 4 U 4 U 8 U 4 U 10 U 7 U 4 U 4 U 4 U CR3-9 CR3-9-20220425 04/25/2022 140 U 84 U 5 U 5 U 6 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 16 of 83

PAGE 4 OF 4 TABLE 2 REMP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2020 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium Potassium-40 Manganese-54 Cobalt-58 Iron-59 Cobalt-60 Zinc-65 Zirconium/

Niobium-95 Cesium-134 Cesium-137 Barium/

Lanthanum-140 pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L Location Sample Name Date Sampled CR3-9 CR3-9-20220715 07/15/2022 132 U 70 U 6 U 5 U 6 U CR3-9 CR3-9-20221021 10/21/2022 129 U 53 U 4 U 3 U 4 U CR3-9 CR3-9-20230127 01/27/2023 137 U 53 U 4 U 5 U 4 U CR3-9 CR3-9-20230412 04/12/2023 137 U 53 U 4 U 4 U 5 U CR3-9 CR3-9-20230727 07/27/2023 140 U 63 U 4 U 5 U 5 U CR3-9 CR3-9-20231016 10/16/2023 138 U 52 U 5 U 5 U 5 U CR3-9 CR3-9-20240125 01/25/2024 135 U 82 U 5 U 5 U 5 U CR3-9 CR3-9-20240418 04/18/2024 137 U 82 U 5 U 4 U 7 U CR3-9 CR3-9-20240727 07/27/2024 139 U 62 U 4 U 5 U 5 U CR3-9 CR3-9-20241028 10/28/2024 142 U 49 U 3 U 4 U 4 U CR3-10 CR3-10-20200123 01/23/2020 146 U 44 U 3 U 4 U 8 U 3 U 9 U 6 U 4 U 4 U 6 U CR3-10 CR3-10-20200427 04/27/2020 136 U 47 U 4 U 4 U 8 U 4 U 10 U 7 U 4 U 4 U 8 U CR3-10 CR3-10-20200720 07/20/2020 139 U 76 U 6 U 7 U 16 U 7 U 19 U 14 U 9 U 9 U 28 U CR3-10 CR3-10-20201216 12/16/2020 139 U 48 U 4 U 4 U 8 U 4 U 11 U 7 U 4 U 5 U 4 U CR3-10 CR3-10-20210127 01/27/2021 133 U 45 U 4 U 4 U 7 U 4 U 10 U 7 U 4 U 5 U 4 U CR3-10 CR3-10-20210520 05/20/2021 141 U 53 U 5 U 5 U 8 U 5 U 12 U 7 U 5 U 5 U 5 U CR3-10 CR3-10-20210928 09/28/2021 136 U 52 U 4 U 4 U 9 U 5 U 11 U 8 U 5 U 5 U 4 U CR3-10 CR3-10-20220104 01/04/2022 133 U 52 U 4 U 4 U 7 U 4 U 10 U 7 U 4 U 4 U 5 U CR3-10 CR3-10-20220425 04/25/2022 137 U 46 U 4 U 5 U 5 U CR3-10 CR3-10-20220715 07/15/2022 136 U 24 U 4 U 4 U 4 U CR3-10 CR3-10-20221021 10/21/2022 134 U 72 U 6 U 5 U 6 U CR3-10 CR3-10-20230127 01/27/2023 137 U 68 U 6 U 6 U 5 U CR3-10 CR3-10-20230412 04/12/2023 137 U 75 U 7 U 4 U 6 U CR3-10 CR3-10-20230727 07/27/2023 140 U 70 U 6 U 6 U 6 U CR3-10 CR3-10-20231016 10/16/2023 139 U 87 U 4 U 5 U 6 U CR3-10 CR3-10R-20240125 01/25/2024 135 U 45 U 4 U 4 U 4 U CR3-10 CR3-10R-20240418 04/18/2024 138 U 50 U 5 U 5 U 4 U CR3-10 CR3-10R-20240702 07/02/2024 141 U 38 U 3 U 4 U 4 U CR3-10 CR3-10R-20241016 10/16/2024 142 U 51 U 4 U 4 U 4 U Notes:

-: Not Analyzed pCi/L: picoCurie per Liter U: Not detected, value is the laboratory reporting limit

- Bold values indicate a concentration detected above the Minimum Detectable Concentration.

HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 17 of 83

PAGE 1 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L CR3-1D CR3-1D-20130103 01/03/2013 128 CR3-1D CR3-1D-20130401 04/01/2013 151 CR3-1D CR3-1D-20130701 07/01/2013 136 U CR3-1D CR3-1D-20131008 10/08/2013 147 U CR3-1D CR3-1D-20140113 01/13/2014 135 U CR3-1D CR3-1D-20140402 04/02/2014 141 U CR3-1D CR3-1D-20140703 07/03/2014 146 U CR3-1D CR3-1D-20141014 10/14/2014 150 U CR3-1D CR3-1D-20150122 01/22/2015 153 U CR3-1D CR3-1D-20150416 04/16/2015 163 U CR3-1D CR3-1D-20150716 07/16/2015 145 U CR3-1D CR3-1D-20151014 10/14/2015 140 U CR3-1D CR3-1D-20160121 01/21/2016 151 U CR3-1D CR3-1D-20160413 04/13/2016 153 U CR3-1D CR3-1D-20160721 07/21/2016 150 U CR3-1D CR3-1D-20161013 10/13/2016 155 U CR3-1D CR3-1D-20170119 01/19/2017 156 U CR3-1D CR3-1D-20170414 04/14/2017 158 U CR3-1D CR3-1D-20170718 07/18/2017 146 U CR3-1D CR3-1D-20171012 10/12/2017 144 U CR3-1D CR3-1D-20180111 01/11/2018 144 U CR3-1D CR3-1D-20180412 04/12/2018 155 U CR3-1D CR3-1D-20180719 07/19/2018 137 U CR3-1D CR3-1D-20181025 10/25/2018 142 U CR3-1D CR3-1D-20190117 01/17/2019 145 U CR3-1D CR3-1D-20190417 04/17/2019 139 U CR3-1D CR3-1D-20190717 07/17/2019 136 U CR3-1D CR3-1D-20191014 10/14/2019 141 U CR3-1D CR3-1D-20200123 01/23/2020 139 U CR3-1D CR3-1D-20200427 04/27/2020 145 U CR3-1D CR3-1D-20200720 07/20/2020 139 U CR3-1D CR3-1D-20201006 10/06/2020 137 U CR3-1D CR3-1D-20210127 01/27/2021 133 U CR3-1D CR3-1D-20210520 05/20/2021 141 U CR3-1D CR3-1D-20210928 09/28/2021 136 U CR3-1D CR3-1D-20211228 12/28/2021 132 U CR3-1D CR3-1D-20220425 04/25/2022 137 U CR3-1D CR3-1D-20220715 07/15/2022 132 U CR3-1D CR3-1D-20221021 10/21/2022 129 U CR3-1D CR3-1D-20230127 01/27/2023 137 U CR3-1D CR3-1D-20230412 04/12/2023 137 U CR3-1D CR3-1D-20230727 07/27/2023 140 U CR3-1D CR3-1D-20231016 10/16/2023 139 U CR3-1D CR3-1D-20240125 01/25/2024 135 U CR3-1D CR3-1D-20240417 04/17/2024 137 U CR3-1D CR3-1D-20240702 07/02/2024 141 U CR3-1D CR3-1D-20241016 10/16/2024 142 U CR3-1S CR3-1S-20111005 10/05/2011 138 U CR3-1S CR3-1S-20130103 01/03/2013 142 U CR3-1S CR3-1S-20130401 04/01/2013 142 U CR3-1S CR3-1S-20130701 07/01/2013 128 CR3-1S CR3-1S-20131008 10/08/2013 143 U CR3-1S CR3-1S-20140113 01/13/2014 135 U CR3-1S CR3-1S-20140402 04/02/2014 139 U CR3-1S CR3-1S-20140703 07/03/2014 146 U CR3-1S CR3-1S-20141014 10/14/2014 150 U CR3-1S CR3-1S-20150122 01/22/2015 153 U CR3-1S CR3-1S-20150416 04/16/2015 149 U CR3-1S CR3-1S-20150716 07/16/2015 145 U CR3-1S CR3-1S-20151014 10/14/2015 142 U CR3-1S CR3-1S-20160121 01/21/2016 175 CR3-1S CR3-1S-20160413 04/13/2016 153 U CR3-1S CR3-1S-20160721 07/21/2016 171 U CR3-1S CR3-1S-20161013 10/13/2016 155 U CR3-1S CR3-1S-20170119 01/19/2017 150 U CR3-1S CR3-1S-20170414 04/14/2017 158 U CR3-1S CR3-1S-20170718 07/18/2017 146 U CR3-1S CR3-1S-20171012 10/12/2017 144 U CR3-1S CR3-1S-20180111 01/11/2018 144 U CR3-1S CR3-1S-20180412 04/12/2018 155 U CR3-1S CR3-1S-20180719 07/19/2018 149 U CR3-1S CR3-1S-20181025 10/25/2018 142 U CR3-1S CR3-1S-20190117 01/17/2019 145 U CR3-1S CR3-1S-20190417 04/17/2019 139 U CR3-1S CR3-1S-20190717 07/17/2019 136 U Location Sample Name Date Sampled HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 18 of 83

PAGE 2 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-1S CR3-1S-20191014 10/14/2019 141 U CR3-1S CR3-1S-20200123 01/23/2020 139 U CR3-1S CR3-1S-20200427 04/27/2020 145 U CR3-1S CR3-1S-20200720 07/20/2020 137 U CR3-1S CR3-1S-20201006 10/06/2020 137 U CR3-1S CR3-1S-20210127 01/27/2021 133 U CR3-1S CR3-1S-20210520 05/20/2021 139 U CR3-1S CR3-1S-20210928 09/28/2021 136 U CR3-1S CR3-1S-20211228 12/28/2021 132 U CR3-1S CR3-1S-20220425 04/25/2022 137 U CR3-1S CR3-1S-20220715 07/15/2022 132 U CR3-1S CR3-1S-20221021 10/21/2022 129 U CR3-1S CR3-1S-20230127 01/27/2023 137 U CR3-1S CR3-1S-20230412 04/12/2023 148 U CR3-1S CR3-1S-20230727 07/27/2023 140 U CR3-1S CR3-1S-20231016 10/16/2023 138 U CR3-1S CR3-1S-20240125 01/25/2024 137 U CR3-1S CR3-1S-20240417 04/17/2024 138 U CR3-1S CR3-1S-20240702 07/02/2024 136 U CR3-1S CR3-1S-20241016 10/16/2024 142 U CR3-2 CR3-2-20070227 02/27/2007 143 U CR3-2 CR3-2-20070404 04/04/2007 143 U CR3-2 CR3-2-20070703 07/03/2007 167 U CR3-2 CR3-2-20070904 09/04/2007 167 U CR3-2 CR3-2-20071003 10/03/2007 134 U CR3-2 CR3-2-20080108 01/08/2008 140 U CR3-2 CR3-2-20080401 04/01/2008 145 U CR3-2 CR3-2-20080708 07/08/2008 139 U CR3-2 CR3-2-20081007 10/07/2008 155 U CR3-2 CR3-2-20090106 01/06/2009 143 U CR3-2 CR3-2-20090407 04/07/2009 139 U CR3-2 CR3-2-20090707 07/07/2009 143 U CR3-2 CR3-2-20091013 10/13/2009 86 CR3-2 CR3-2-20100105 01/05/2010 142 U CR3-2 CR3-2-20100408 04/08/2010 147 U CR3-2 CR3-2-20100707 07/07/2010 145 U CR3-2 CR3-2-20101005 10/05/2010 138 U CR3-2 CR3-2-20110106 01/06/2011 135 U CR3-2 CR3-2-20110405 04/05/2011 145 U CR3-2 CR3-2-20110705 07/05/2011 141 U CR3-2 CR3-2-20111005 10/05/2011 144 U CR3-2 CR3-2-20120104 01/04/2012 147 U CR3-2 CR3-2-20120403 04/03/2012 140 U CR3-2 CR3-2-20120705 07/05/2012 132 U CR3-2 CR3-2-20121001 10/01/2012 135 U CR3-2 CR3-2-20130103 01/03/2013 142 U CR3-2 CR3-2-20130401 04/01/2013 141 U CR3-2 CR3-2-20130701 07/01/2013 110 CR3-2 CR3-2-20131008 10/08/2013 147 U CR3-2 CR3-2-20140113 01/13/2014 135 U CR3-2 CR3-2-20140402 04/02/2014 141 U CR3-2 CR3-2-20140703 07/03/2014 146 U CR3-2 CR3-2-20141014 10/14/2014 150 U CR3-2 CR3-2-20150122 01/22/2015 153 U CR3-2 CR3-2-20150416 04/16/2015 149 U CR3-2 CR3-2-20150716 07/16/2015 145 U CR3-2 CR3-2-20151014 10/14/2015 146 U CR3-2 CR3-2-20160121 01/21/2016 142 U CR3-2 CR3-2-20160413 04/13/2016 161 U CR3-2 CR3-2-20161013 10/13/2016 155 U CR3-2 CR3-2-20170119 01/19/2017 145 U CR3-2 CR3-2-20170414 04/14/2017 158 U CR3-2 CR3-2-20170718 07/18/2017 146 U CR3-2 CR3-2-20171012 10/12/2017 144 U CR3-2 CR3-2-20180111 01/11/2018 160 U CR3-2 CR3-2-20180412 04/12/2018 155 U CR3-2 CR3-2-20180719 07/19/2018 137 U CR3-2 CR3-2-20181025 10/25/2018 142 U CR3-2 CR3-2-20190117 01/17/2019 146 U CR3-2 CR3-2-20190417 04/17/2019 139 U CR3-2 CR3-2-20190717 07/17/2019 136 U CR3-2 CR3-2-20191014 10/14/2019 141 U CR3-2 CR3-2-20200123 01/23/2020 139 U CR3-2 CR3-2-20200427 04/27/2020 134 U CR3-2 CR3-2-20200720 07/20/2020 137 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 19 of 83

PAGE 3 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-2 CR3-2-20201006 10/06/2020 137 U CR3-2 CR3-2-20210127 01/27/2021 133 U CR3-2 CR3-2-20210520 05/20/2021 135 U CR3-2 CR3-2-20210928 09/28/2021 136 U CR3-2 CR3-2-20211228 12/28/2021 132 U CR3-2 CR3-2-20220104 01/04/2022 137 U CR3-2 CR3-2-20220425 04/25/2022 137 U CR3-2 CR3-2-20230131 01/31/2023 137 U CR3-2 CR3-2-20230727 07/27/2023 140 U CR3-2 CR3-2-20231016 10/16/2023 138 U CR3-2 CR3-2-20240125 01/25/2024 135 U CR3-2 CR3-2-20240417 04/17/2024 138 U CR3-2 CR3-2-20240702 07/02/2024 136 U CR3-2 CR3-2-20241016 10/16/2024 142 U CR3-3D CR3-3D-20130103 01/03/2013 91 CR3-3D CR3-3D-20130401 04/01/2013 139 U CR3-3D CR3-3D-20130701 07/01/2013 136 U CR3-3D CR3-3D-20131008 10/08/2013 147 U CR3-3D CR3-3D-20140113 01/13/2014 135 U CR3-3D CR3-3D-20140402 04/02/2014 141 U CR3-3D CR3-3D-20140703 07/03/2014 146 U CR3-3D CR3-3D-20141014 10/14/2014 141 U CR3-3D CR3-3D-20150122 01/22/2015 153 U CR3-3D CR3-3D-20150416 04/16/2015 163 U CR3-3D CR3-3D-20150716 07/16/2015 145 U CR3-3D CR3-3D-20151014 10/14/2015 140 U CR3-3D CR3-3D-20160121 01/21/2016 142 U CR3-3D CR3-3D-20160413 04/13/2016 149 U CR3-3D CR3-3D-20160721 07/21/2016 150 U CR3-3D CR3-3D-20161013 10/13/2016 155 U CR3-3D CR3-3D-20170119 01/19/2017 159 U CR3-3D CR3-3D-20170414 04/14/2017 158 U CR3-3D CR3-3D-20170718 07/18/2017 146 U CR3-3D CR3-3D-20171012 10/12/2017 144 U CR3-3D CR3-3D-20180111 01/11/2018 144 U CR3-3D CR3-3D-20180412 04/12/2018 155 U CR3-3D CR3-3D-20180719 07/19/2018 137 U CR3-3D CR3-3D-20181025 10/25/2018 142 U CR3-3D CR3-3D-20190117 01/17/2019 146 U CR3-3D CR3-3D-20190417 04/17/2019 139 U CR3-3D CR3-3D-20190717 07/17/2019 136 U CR3-3D CR3-3D-20191014 10/14/2019 141 U CR3-3D CR3-3D-20200123 01/23/2020 146 U CR3-3D CR3-3D-20200427 04/27/2020 136 U CR3-3D CR3-3D-20200720 07/20/2020 137 U CR3-3D CR3-3D-20201006 10/06/2020 137 U CR3-3D CR3-3D-20210127 01/27/2021 142 U CR3-3D CR3-3D-20210520 05/20/2021 139 U CR3-3D CR3-3D-20210928 09/28/2021 136 U CR3-3D CR3-3D-20211228 12/28/2021 132 U CR3-3D CR3-3D-20220104 01/04/2022 132 U CR3-3D CR3-3D-20220425 04/25/2022 140 U CR3-3D CR3-3D-20220715 07/15/2022 132 U CR3-3D CR3-3D-20221021 10/21/2022 129 U CR3-3D CR3-3D-20230131 01/31/2023 137 U CR3-3D CR3-3D-20230412 04/12/2023 137 U CR3-3D CR3-3D-20230727 07/27/2023 141 U CR3-3D CR3-3D-20231016 10/16/2023 138 U CR3-3D CR3-3D-20240125 01/25/2024 133 U CR3-3D CR3-3D-20240417 04/17/2024 138 U CR3-3D CR3-3D-20240702 07/02/2024 141 U CR3-3D CR3-3D-20241016 10/16/2024 142 U CR3-3S CR3-3S-20130103 01/03/2013 137 U CR3-3S CR3-3S-20130401 04/01/2013 142 U CR3-3S CR3-3S-20130701 07/01/2013 136 U CR3-3S CR3-3S-20131008 10/08/2013 147 U CR3-3S CR3-3S-20140113 01/13/2014 135 U CR3-3S CR3-3S-20140402 04/02/2014 139 U CR3-3S CR3-3S-20140703 07/03/2014 146 U CR3-3S CR3-3S-20141014 10/14/2014 141 U CR3-3S CR3-3S-20150122 01/22/2015 148 U CR3-3S CR3-3S-20150416 04/16/2015 149 U CR3-3S CR3-3S-20150716 07/16/2015 145 U CR3-3S CR3-3S-20151014 10/14/2015 149 U CR3-3S CR3-3S-20160121 01/21/2016 151 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 20 of 83

PAGE 4 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-3S CR3-3S-20160413 04/13/2016 152 U CR3-3S CR3-3S-20160721 07/21/2016 150 U CR3-3S CR3-3S-20161013 10/13/2016 155 U CR3-3S CR3-3S-20170119 01/19/2017 150 U CR3-3S CR3-3S-20170414 04/14/2017 146 U CR3-3S CR3-3S-20170718 07/18/2017 146 U CR3-3S CR3-3S-20171012 10/12/2017 144 U CR3-3S CR3-3S-20180111 01/11/2018 160 U CR3-3S CR3-3S-20180412 04/12/2018 155 U CR3-3S CR3-3S-20180719 07/19/2018 143 U CR3-3S CR3-3S-20181025 10/25/2018 142 U CR3-3S CR3-3S-20190117 01/17/2019 146 U CR3-3S CR3-3S-20190417 04/17/2019 139 U CR3-3S CR3-3S-20190717 07/17/2019 136 U CR3-3S CR3-3S-20191014 10/14/2019 141 U CR3-3S CR3-3S-20200123 01/23/2020 139 U CR3-3S CR3-3S-20200427 04/27/2020 134 U CR3-3S CR3-3S-20200720 07/20/2020 137 U CR3-3S CR3-3S-20201006 10/06/2020 137 U CR3-3S CR3-3S-20210127 01/27/2021 133 U CR3-3S CR3-3S-20210520 05/20/2021 141 U CR3-3S CR3-3S-20210928 09/28/2021 136 U CR3-3S CR3-3S-20211228 12/28/2021 132 U CR3-3S CR3-3S-20220104 01/04/2022 132 U CR3-3S CR3-3S-20220425 04/25/2022 137 U CR3-3S CR3-3S-20220715 07/15/2022 132 U CR3-3S CR3-3S-20221021 10/21/2022 129 U CR3-3S CR3-3S-20230131 01/31/2023 137 U CR3-3S CR3-3S-20230412 04/12/2023 148 U CR3-3S CR3-3S-20230727 07/27/2023 142 U CR3-3S CR3-3S-20231016 10/16/2023 138 U CR3-3S CR3-3S-20240125 01/25/2024 135 U CR3-3S CR3-3S-20240417 04/17/2024 135 U CR3-3S CR3-3S-20240702 07/02/2024 141 U CR3-3S CR3-3S-20241016 10/16/2024 142 U CR3-4 CR3-4-20070227 02/27/2007 143 U CR3-4 CR3-4-20070404 04/04/2007 143 U CR3-4 CR3-4-20070703 07/03/2007 167 U CR3-4 CR3-4-20070904 09/04/2007 167 U CR3-4 CR3-4-20071003 10/03/2007 79 CR3-4 CR3-4-20080108 01/08/2008 140 U CR3-4 CR3-4-20080401 04/01/2008 145 U CR3-4 CR3-4-20080708 07/08/2008 139 U CR3-4 CR3-4-20081007 10/07/2008 139 U CR3-4 CR3-4-20090106 01/06/2009 143 U CR3-4 CR3-4-20090407 04/07/2009 139 U CR3-4 CR3-4-20090707 07/07/2009 143 U CR3-4 CR3-4-20091013 10/13/2009 150 U CR3-4 CR3-4-20100105 01/05/2010 142 U CR3-4 CR3-4-20100408 04/08/2010 147 U CR3-4 CR3-4-20100707 07/07/2010 145 U CR3-4 CR3-4-20101005 10/05/2010 138 U CR3-4 CR3-4-20110106 01/06/2011 135 U CR3-4 CR3-4-20110405 04/05/2011 145 U CR3-4 CR3-4-20110705 07/05/2011 141 U CR3-4 CR3-4-20111005 10/05/2011 144 U CR3-4 CR3-4-20120104 01/04/2012 147 U CR3-4 CR3-4-20120403 04/03/2012 75 CR3-4 CR3-4-20120705 07/05/2012 132 U CR3-4 CR3-4-20121001 10/01/2012 138 U CR3-4 CR3-4-20130103 01/03/2013 142 U CR3-4 CR3-4-20130401 04/01/2013 139 U CR3-4 CR3-4-20130701 07/01/2013 135 CR3-4 CR3-4-20131008 10/08/2013 147 U CR3-4 CR3-4-20140113 01/13/2014 135 U CR3-4 CR3-4-20140402 04/02/2014 141 U CR3-4 CR3-4-20140703 07/03/2014 146 U CR3-4 CR3-4-20141014 10/14/2014 145 U CR3-4 CR3-4-20150122 01/22/2015 148 U CR3-4 CR3-4-20150416 04/16/2015 160 U CR3-4 CR3-4-20150716 07/16/2015 145 U CR3-4 CR3-4-20151014 10/14/2015 154 U CR3-4 CR3-4-20160121 01/21/2016 142 U CR3-4 CR3-4-20160413 04/13/2016 153 U CR3-4 CR3-4-20160721 07/21/2016 150 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 21 of 83

PAGE 5 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-4 CR3-4-20161013 10/13/2016 155 U CR3-4 CR3-4-20170119 01/19/2017 150 U CR3-4 CR3-4-20170414 04/14/2017 146 U CR3-4 CR3-4-20170718 07/18/2017 148 U CR3-4 CR3-4-20171012 10/12/2017 158 U CR3-4 CR3-4-20180111 01/11/2018 144 U CR3-4 CR3-4-20180412 04/12/2018 155 U CR3-4 CR3-4-20180719 07/19/2018 137 U CR3-4 CR3-4-20181025 10/25/2018 142 U CR3-4 CR3-4-20190117 01/17/2019 146 U CR3-4 CR3-4-20190417 04/17/2019 139 U CR3-4 CR3-4-20190717 07/17/2019 136 U CR3-4 CR3-4-20191014 10/14/2019 141 U CR3-4 CR3-4-20200123 01/23/2020 138 U CR3-4 CR3-4-20200427 04/27/2020 134 U CR3-4 CR3-4-20200720 07/20/2020 137 U CR3-4 CR3-4-20201006 10/06/2020 137 U CR3-4 CR3-4-20210127 01/27/2021 133 U CR3-4 CR3-4-20210520 05/20/2021 141 U CR3-4 CR3-4-20210928 09/28/2021 136 U CR3-4 CR3-4-20211228 12/28/2021 132 U CR3-4 CR3-4-20220104 01/04/2022 132 U CR3-4 CR3-4-20220425 04/25/2022 133 U CR3-4 CR3-4-20220715 07/15/2022 132 U CR3-4 CR3-4-20221021 10/21/2022 129 U CR3-4 CR3-4-20230127 01/27/2023 138 U CR3-4 CR3-4-20230412 04/12/2023 137 U CR3-4 CR3-4-20230727 07/27/2023 140 U CR3-4 CR3-4-20231016 10/16/2023 138 U CR3-4 CR3-4-20240125 01/25/2024 133 U CR3-4 CR3-4-20240417 04/17/2024 135 U CR3-4 CR3-4-20240702 07/02/2024 136 U CR3-4 CR3-4-20241016 10/16/2024 142 U CR3-5 CR3-5-20070227 02/27/2007 430 CR3-5 CR3-5-20070404 04/04/2007 626 CR3-5 CR3-5-20070504 05/04/2007 808 CR3-5 CR3-5-GEL-20070504 05/04/2007 1080 CR3-5 CR3-5-HEEC-20070504 05/04/2007 334 U CR3-5 CR3-5-20070601 06/01/2007 364 CR3-5 CR3-5-20070703 07/03/2007 617 CR3-5 CR3-5-GEL-20070703 07/03/2007 532 CR3-5 CR3-5-HEEC-20070703 07/03/2007 654 CR3-5 CR3-5-20070807 08/07/2007 285 CR3-5 CR3-5-GEL-20070807 08/07/2007 162 CR3-5 CR3-5-HEEC-20070807 08/07/2007 532 CR3-5 CR3-5-20070904 09/04/2007 314 CR3-5 CR3-5-20071003 10/03/2007 582 CR3-5 CR3-5-20071106 11/06/2007 146 U CR3-5 CR3-5-20071204 12/04/2007 617 CR3-5 CR3-5-20080108 01/08/2008 365 CR3-5 CR3-5-20080206 02/06/2008 946 CR3-5 CR3-5-20080304 03/04/2008 689 CR3-5 CR3-5-20080402 04/02/2008 753 CR3-5 CR3-5-20080504 05/04/2008 1110 CR3-5 CR3-5-20080603 06/03/2008 1055 CR3-5 CR3-5-20080708 07/08/2008 467 CR3-5 CR3-5-20080805 08/05/2008 440 CR3-5 CR3-5-20080902 09/02/2008 271 CR3-5 CR3-5-20081007 10/07/2008 392 CR3-5 CR3-5-20081104 11/04/2008 719 CR3-5 CR3-5-20081208 12/08/2008 868 CR3-5 CR3-5-20090106 01/06/2009 327 CR3-5 CR3-5-20090205 02/05/2009 1364 CR3-5 CR3-5-20090303 03/03/2009 1683 CR3-5 CR3-5-20090407 04/07/2009 1843 CR3-5 CR3-5-20090505 05/05/2009 1967 CR3-5 CR3-5-20090601 06/01/2009 1622 CR3-5 CR3-5-20090707 07/07/2009 1670 CR3-5 CR3-5-20090804 08/04/2009 1854 CR3-5 CR3-5-20090901 09/01/2009 1389 CR3-5 CR3-5-20091005 10/05/2009 1454 CR3-5 CR3-5-20091102 11/02/2009 1392 CR3-5 CR3-5-20091201 12/01/2009 1275 CR3-5 CR3-5-20100105 01/05/2010 1092 CR3-5 CR3-5-20100203 02/03/2010 1159 HALEY & ALDRICH, INC.

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PAGE 6 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-5 CR3-5-20100304 03/04/2010 1213 CR3-5 CR3-5-20100408 04/08/2010 1161 CR3-5 CR3-5-20100506 05/06/2010 1172 CR3-5 CR3-5-20100608 06/08/2010 956 CR3-5 CR3-5-20100707 07/07/2010 1053 CR3-5 CR3-5-20100803 08/03/2010 876 CR3-5 CR3-5-20100908 09/08/2010 718 CR3-5 CR3-5-20101005 10/05/2010 792 CR3-5 CR3-5-20101101 11/01/2010 836 CR3-5 CR3-5-20101207 12/07/2010 745 CR3-5 CR3-5-20110106 01/06/2011 854 CR3-5 CR3-5-20110201 02/01/2011 769 CR3-5 CR3-5-20110302 03/02/2011 741 CR3-5 CR3-5-20110405 04/05/2011 574 CR3-5 CR3-5-20110503 05/03/2011 519 CR3-5 CR3-5-20110608 06/08/2011 586 CR3-5 CR3-5-20110705 07/05/2011 522 CR3-5 CR3-5-20110803 08/03/2011 604 CR3-5 CR3-5-20110907 09/07/2011 634 CR3-5 CR3-5-20111005 10/05/2011 335 CR3-5 CR3-5-20111102 11/02/2011 485 CR3-5 CR3-5-20111207 12/07/2011 696 CR3-5 CR3-5-20120104 01/04/2012 548 CR3-5 CR3-5-20120201 02/01/2012 521 CR3-5 CR3-5-20120307 03/07/2012 580 CR3-5 CR3-5-20120403 04/03/2012 619 CR3-5 CR3-5-20120508 05/08/2012 568 CR3-5 CR3-5-20120606 06/06/2012 482 CR3-5 CR3-5-20120705 07/05/2012 468 CR3-5 CR3-5-20120806 08/06/2012 531 CR3-5 CR3-5-20120905 09/05/2012 551 CR3-5 CR3-5-20121001 10/01/2012 361 CR3-5 CR3-5-20121107 11/07/2012 442 CR3-5 CR3-5-20121204 12/04/2012 532 CR3-5 CR3-5-20130103 01/03/2013 275 CR3-5 CR3-5-20130206 02/06/2013 431 CR3-5 CR3-5-20130308 03/08/2013 480 CR3-5 CR3-5-20130401 04/01/2013 411 CR3-5 CR3-5-20130502 05/02/2013 400 CR3-5 CR3-5-20130604 06/04/2013 404 CR3-5 CR3-5-20130701 07/01/2013 431 CR3-5 CR3-5-20130807 08/07/2013 556 CR3-5 CR3-5-20130903 09/03/2013 530 CR3-5 CR3-5-20131008 10/08/2013 480 CR3-5 CR3-5-20131106 11/06/2013 512 CR3-5 CR3-5-20131205 12/05/2013 312 CR3-5 CR3-5-20140107 01/07/2014 372 CR3-5 CR3-5-20140207 02/07/2014 404 CR3-5 CR3-5-20140306 03/06/2014 389 CR3-5 CR3-5-20140402 04/02/2014 350 CR3-5 CR3-5-20140508 05/08/2014 329 CR3-5 CR3-5-20140605 06/05/2014 385 CR3-5 CR3-5-20140703 07/03/2014 415 CR3-5 CR3-5-20140806 08/06/2014 319 CR3-5 CR3-5-20140904 09/04/2014 427 CR3-5 CR3-5-20141006 10/06/2014 336 CR3-5 CR3-5-20141107 11/07/2014 339 CR3-5 CR3-5-20141204 12/04/2014 300 CR3-5 CR3-5-20150108 01/08/2015 299 CR3-5 CR3-5-20150216 02/16/2015 217 CR3-5 CR3-5-20150416 04/16/2015 260 CR3-5 CR3-5-20150716 07/16/2015 298 CR3-5 CR3-5-20151014 10/14/2015 285 CR3-5 CR3-5-20160121 01/21/2016 503 CR3-5 CR3-5-20160413 04/13/2016 481 CR3-5 CR3-5-20160721 07/21/2016 448 CR3-5 CR3-5-20161013 10/13/2016 459 CR3-5 CR3-5-20170119 01/19/2017 536 CR3-5 CR3-5-20170413 04/13/2017 391 CR3-5 CR3-5-20170718 07/18/2017 463 CR3-5 CR3-5-20171012 10/12/2017 368 CR3-5 CR3-5-20180118 01/18/2018 536 CR3-5 CR3-5-20180412 04/12/2018 391 CR3-5 CR3-5-20180723 07/23/2018 463 CR3-5 CR3-5-20181025 10/25/2018 368 HALEY & ALDRICH, INC.

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PAGE 7 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-5 CR3-5-20190117 01/17/2019 305 CR3-5 CR3-5-20190417 04/17/2019 231 CR3-5 CR3-5-20190717 07/17/2019 188 CR3-5 CR3-5-20191014 10/14/2019 236 CR3-5 CR3-5-20200123 01/23/2020 204 CR3-5 CR3-5-20200427 04/27/2020 268 CR3-5 CR3-5-20200701 07/01/2020 202 CR3-5 CR3-5-20200720 07/20/2020 202 CR3-5 CR3-5-20201006 10/06/2020 236 CR3-5 CR3-5-20201216 12/16/2020 236 CR3-5 CR3-5-20210127 01/27/2021 203 CR3-5 CR3-5-20210520 05/20/2021 200 CR3-5 CR3-5-20210601 06/01/2021 200 CR3-5 CR3-5-20210928 09/28/2021 160 CR3-5 CR3-5-20220106 01/06/2022 171 CR3-5 CR3-5-20220425 04/25/2022 137 U CR3-5 CR3-5-20230127 01/27/2023 138 U CR3-5 CR3-5-20230412 04/12/2023 137 U CR3-5 CR3-5-20230727 07/27/2023 141 U CR3-5 CR3-5-20231016 10/16/2023 138 U CR3-5 CR3-5-20240125 01/25/2024 111 CR3-5 CR3-5-20240417 04/17/2024 137 U CR3-5 CR3-5-20240702 07/02/2024 87 CR3-5 CR3-5-20241016 10/24/2024 441 CR3-6D CR3-6D-20070227 02/27/2007 143 U CR3-6D CR3-6D-20070404 04/04/2007 143 U CR3-6D CR3-6D-20070703 07/03/2007 130 CR3-6D CR3-6D-20070904 09/04/2007 69 CR3-6D CR3-6D-20071003 10/03/2007 134 U CR3-6D CR3-6D-20080108 01/08/2008 140 U CR3-6D CR3-6D-20080401 04/01/2008 145 U CR3-6D CR3-6D-20080708 07/08/2008 139 U CR3-6D CR3-6D-20081007 10/07/2008 139 U CR3-6D CR3-6D-20090106 01/06/2009 143 U CR3-6D CR3-6D-20090407 04/07/2009 139 U CR3-6D CR3-6D-20090707 07/07/2009 143 U CR3-6D CR3-6D-20091013 10/13/2009 108 CR3-6D CR3-6D-20100105 01/05/2010 142 U CR3-6D CR3-6D-20100408 04/08/2010 147 U CR3-6D CR3-6D-20100707 07/07/2010 145 U CR3-6D CR3-6D-20101005 10/05/2010 94 CR3-6D CR3-6D-20110106 01/06/2011 135 U CR3-6D CR3-6D-20110405 04/05/2011 145 U CR3-6D CR3-6D-20110705 07/05/2011 128 CR3-6D CR3-6D-20111005 10/05/2011 145 U CR3-6D CR3-6D-20120104 01/04/2012 147 U CR3-6D CR3-6D-20120403 04/03/2012 98 CR3-6D CR3-6D-20120705 07/05/2012 144 U CR3-6D CR3-6D-20121001 10/01/2012 135 U CR3-6D CR3-6D-20130103 01/03/2013 118 CR3-6D CR3-6D-20130401 04/01/2013 141 U CR3-6D CR3-6D-20130701 07/01/2013 133 CR3-6D CR3-6D-20131008 10/08/2013 147 U CR3-6D CR3-6D-20140113 01/13/2014 135 U CR3-6D CR3-6D-20140402 04/02/2014 147 CR3-6D CR3-6D-20140703 07/03/2014 146 U CR3-6D CR3-6D-20141014 10/14/2014 119 CR3-6D CR3-6D-20150122 01/22/2015 153 U CR3-6D CR3-6D-20150416 04/16/2015 163 U CR3-6D CR3-6D-20150716 07/16/2015 145 U CR3-6D CR3-6D-20151014 10/14/2015 149 U CR3-6D CR3-6D-20160121 01/21/2016 138 CR3-6D CR3-6D-20160413 04/13/2016 152 U CR3-6D CR3-6D-20160721 07/21/2016 163 CR3-6D CR3-6D-20161013 10/13/2016 155 U CR3-6D CR3-6D-20170119 01/19/2017 150 U CR3-6D CR3-6D-20170414 04/14/2017 146 U CR3-6D CR3-6D-20170718 07/18/2017 105 CR3-6D CR3-6D-20171012 10/12/2017 146 U CR3-6D CR3-6D-20180111 01/11/2018 151 U CR3-6D CR3-6D-20180412 04/12/2018 155 U CR3-6D CR3-6D-20180719 07/19/2018 137 U CR3-6D CR3-6D-20181025 10/25/2018 142 U CR3-6D CR3-6D-20190117 01/17/2019 141 U CR3-6D CR3-6D-20190417 04/17/2019 139 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 24 of 83

PAGE 8 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-6D CR3-6D-20190717 07/17/2019 135 U CR3-6D CR3-6D-20191014 10/14/2019 141 U CR3-6D CR3-6D-20200123 01/23/2020 139 U CR3-6D CR3-6D-20200427 04/27/2020 145 U CR3-6D CR3-6D-20200720 07/20/2020 204 CR3-6D CR3-6D-20201006 10/06/2020 134 U CR3-6D CR3-6D-20210127 01/27/2021 133 U CR3-6D CR3-6D-20210520 05/20/2021 140 U CR3-6D CR3-6D-20210609 06/09/2021 140 U CR3-6D CR3-6D-20211228 12/28/2021 133 U CR3-6D CR3-6D-20220104 01/04/2022 133 U CR3-6D CR3-6D-20220106 01/06/2022 133 U CR3-6D CR3-6D-20220425 04/25/2022 137 U CR3-6D CR3-6D-20221021 10/21/2022 129 U CR3-6D CR3-6D-20230127 01/27/2023 138 U CR3-6D CR3-6D-20230727 07/27/2023 140 U CR3-6D CR3-6D-20231016 10/16/2023 138 U CR3-6D CR3-6D-20240125 01/25/2024 133 U CR3-6D CR3-6D-20240418 04/18/2024 137 U CR3-6D CR3-6D-20240702 07/02/2024 141 U CR3-6D CR3-6D-20241016 10/16/2024 142 U CR3-6S CR3-6S-20070227 02/27/2007 143 U CR3-6S CR3-6S-20070404 04/04/2007 143 U CR3-6S CR3-6S-20070504 05/04/2007 147 U CR3-6S CR3-6S-20070601 06/01/2007 136 U CR3-6S CR3-6S-20070703 07/03/2007 167 U CR3-6S CR3-6S-20070807 08/07/2007 139 U CR3-6S CR3-6S-20070904 09/04/2007 133 U CR3-6S CR3-6S-20071003 10/03/2007 103 CR3-6S CR3-6S-20071106 11/06/2007 146 U CR3-6S CR3-6S-20071204 12/04/2007 143 U CR3-6S CR3-6S-20080108 01/08/2008 140 U CR3-6S CR3-6S-20080206 02/06/2008 143 U CR3-6S CR3-6S-20080304 03/04/2008 143 U CR3-6S CR3-6S-20080402 04/02/2008 86 CR3-6S CR3-6S-20080504 05/04/2008 145 U CR3-6S CR3-6S-20080603 06/03/2008 142 U CR3-6S CR3-6S-20080708 07/08/2008 80 CR3-6S CR3-6S-20080805 08/05/2008 146 U CR3-6S CR3-6S-20080902 09/02/2008 145 U CR3-6S CR3-6S-20081007 10/07/2008 139 U CR3-6S CR3-6S-20081104 11/04/2008 147 U CR3-6S CR3-6S-20081208 12/08/2008 146 U CR3-6S CR3-6S-20090106 01/06/2009 90 CR3-6S CR3-6S-20090205 02/05/2009 142 U CR3-6S CR3-6S-20090303 03/03/2009 173 CR3-6S CR3-6S-20090407 04/07/2009 139 U CR3-6S CR3-6S-20090505 05/05/2009 188 CR3-6S CR3-6S-20090601 06/01/2009 180 CR3-6S CR3-6S-20090707 07/07/2009 137 CR3-6S CR3-6S-20090804 08/04/2009 165 CR3-6S CR3-6S-20090901 09/01/2009 165 U CR3-6S CR3-6S-20091005 10/05/2009 165 U CR3-6S CR3-6S-20091102 11/02/2009 117 CR3-6S CR3-6S-20091201 12/01/2009 127 CR3-6S CR3-6S-20100105 01/05/2010 142 U CR3-6S CR3-6S-20100203 02/03/2010 151 U CR3-6S CR3-6S-20100304 03/04/2010 155 CR3-6S CR3-6S-20100408 04/08/2010 147 U CR3-6S CR3-6S-20100506 05/06/2010 155 U CR3-6S CR3-6S-20100608 06/08/2010 147 U CR3-6S CR3-6S-20100707 07/07/2010 145 U CR3-6S CR3-6S-20100803 08/03/2010 145 U CR3-6S CR3-6S-20100908 09/08/2010 145 U CR3-6S CR3-6S-20101005 10/05/2010 159 CR3-6S CR3-6S-20101101 11/01/2010 107 CR3-6S CR3-6S-20101207 12/07/2010 140 U CR3-6S CR3-6S-20110106 01/06/2011 131 CR3-6S CR3-6S-20110201 02/01/2011 93 CR3-6S CR3-6S-20110302 03/02/2011 143 U CR3-6S CR3-6S-20110405 04/05/2011 145 U CR3-6S CR3-6S-20110503 05/03/2011 141 U CR3-6S CR3-6S-20110608 06/08/2011 123 CR3-6S CR3-6S-20110705 07/05/2011 141 U CR3-6S CR3-6S-20110803 08/03/2011 143 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 25 of 83

PAGE 9 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-6S CR3-6S-20110907 09/07/2011 146 U CR3-6S CR3-6S-20111005 10/05/2011 119 CR3-6S CR3-6S-20111102 11/02/2011 123 CR3-6S CR3-6S-20111207 12/07/2011 152 U CR3-6S CR3-6S-20120104 01/04/2012 147 U CR3-6S CR3-6S-20120201 02/01/2012 150 U CR3-6S CR3-6S-20120307 03/07/2012 148 U CR3-6S CR3-6S-20120403 04/03/2012 146 CR3-6S CR3-6S-20120508 05/08/2012 115 CR3-6S CR3-6S-20120606 06/06/2012 146 U CR3-6S CR3-6S-20120705 07/05/2012 102 CR3-6S CR3-6S-20120806 08/06/2012 139 U CR3-6S CR3-6S-20120905 09/05/2012 141 U CR3-6S CR3-6S-20121001 10/01/2012 91 CR3-6S CR3-6S-20121107 11/07/2012 115 CR3-6S CR3-6S-20121204 12/04/2012 77 CR3-6S CR3-6S-20130103 01/03/2013 142 U CR3-6S CR3-6S-20130206 02/06/2013 142 U CR3-6S CR3-6S-20130308 03/08/2013 143 CR3-6S CR3-6S-20130401 04/01/2013 141 U CR3-6S CR3-6S-20130502 05/02/2013 108 CR3-6S CR3-6S-20130604 06/04/2013 153 CR3-6S CR3-6S-20130701 07/01/2013 130 CR3-6S CR3-6S-20130807 08/07/2013 125 CR3-6S CR3-6S-20130903 09/03/2013 135 CR3-6S CR3-6S-20131008 10/08/2013 147 U CR3-6S CR3-6S-20131106 11/06/2013 143 U CR3-6S CR3-6S-20131205 12/05/2013 139 U CR3-6S CR3-6S-20140107 01/07/2014 143 U CR3-6S CR3-6S-20140207 02/07/2014 127 CR3-6S CR3-6S-20140306 03/06/2014 133 U CR3-6S CR3-6S-20140402 04/02/2014 141 U CR3-6S CR3-6S-20140508 05/08/2014 138 U CR3-6S CR3-6S-20140605 06/05/2014 156 CR3-6S CR3-6S-20140703 07/03/2014 146 U CR3-6S CR3-6S-20140806 08/06/2014 154 CR3-6S CR3-6S-20140904 09/04/2014 148 U CR3-6S CR3-6S-20141006 10/06/2014 148 U CR3-6S CR3-6S-20141107 11/07/2014 140 U CR3-6S CR3-6S-20141204 12/04/2014 140 U CR3-6S CR3-6S-20150108 01/08/2015 151 U CR3-6S CR3-6S-20150216 02/16/2015 150 U CR3-6S CR3-6S-20150416 04/16/2015 149 U CR3-6S CR3-6S-20150716 07/16/2015 141 U CR3-6S CR3-6S-20151014 10/14/2015 142 U CR3-6S CR3-6S-20160121 01/21/2016 142 U CR3-6S CR3-6S-20160413 04/13/2016 152 U CR3-6S CR3-6S-20160721 07/21/2016 150 U CR3-6S CR3-6S-20161013 10/13/2016 155 U CR3-6S CR3-6S-20170119 01/19/2017 150 U CR3-6S CR3-6S-20170413 04/13/2017 146 U CR3-6S CR3-6S-20170718 07/18/2017 153 U CR3-6S CR3-6S-20171012 10/12/2017 146 U CR3-6S CR3-6S-20180118 01/18/2018 151 U CR3-6S CR3-6S-20180412 04/12/2018 155 U CR3-6S CR3-6S-20180723 07/23/2018 137 U CR3-6S CR3-6S-20181025 10/25/2018 142 U CR3-6S CR3-6S-20190117 01/17/2019 141 U CR3-6S CR3-6S-20190417 04/17/2019 139 U CR3-6S CR3-6S-20190717 07/17/2019 136 U CR3-6S CR3-6S-20191014 10/14/2019 141 U CR3-6S CR3-6S-20200123 01/23/2020 139 U CR3-6S CR3-6S-20200427 04/27/2020 134 U CR3-6S CR3-6S-20200701 07/01/2020 137 U CR3-6S CR3-6S-20200720 07/20/2020 137 U CR3-6S CR3-6S-20201006 10/06/2020 134 U CR3-6S CR3-6S-20201216 12/16/2020 134 U CR3-6S CR3-6S-20210127 01/27/2021 134 CR3-6S CR3-6S-20210520 05/20/2021 140 U CR3-6S CR3-6S-20210609 06/09/2021 140 U CR3-6S CR3-6S-20220106 01/06/2022 133 U CR3-6S CR3-6S-20220425 04/25/2022 140 U CR3-6S CR3-6S-20221021 10/21/2022 129 U CR3-6S CR3-6S-20230127 01/27/2023 137 U CR3-6S CR3-6S-20230412 04/12/2023 137 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 26 of 83

PAGE 10 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-6S CR3-6S-20230727 07/27/2023 140 U CR3-6S CR3-6S-20231016 10/16/2023 138 U CR3-6S CR3-6S-20240125 01/25/2024 137 U CR3-6S CR3-6S-20240418 04/18/2024 137 U CR3-6S CR3-6S-20240702 07/02/2024 136 U CR3-6S CR3-6S-20241016 10/16/2024 142 U CR3-7 CR3-7-20070227 02/27/2007 759 CR3-7 CR3-7-20070404 04/04/2007 582 CR3-7 CR3-7-20070504 05/04/2007 603 CR3-7 CR3-7-GEL-20070504 05/04/2007 771 CR3-7 CR3-7-HEEC-20070504 05/04/2007 335 U CR3-7 CR3-7-20070601 06/01/2007 596 CR3-7 CR3-7-20070703 07/03/2007 239 CR3-7 CR3-7-GEL-20070703 07/03/2007 391 CR3-7 CR3-7-HEEC-20070703 07/03/2007 297 U CR3-7 CR3-7-20070807 08/07/2007 287 CR3-7 CR3-7-GEL-20070807 08/07/2007 468 CR3-7 CR3-7-HEEC-20070807 08/07/2007 543 CR3-7 CR3-7-20070904 09/04/2007 600 CR3-7 CR3-7-20071003 10/03/2007 347 CR3-7 CR3-7-20071106 11/06/2007 698 CR3-7 CR3-7-20071204 12/04/2007 283 CR3-7 CR3-7-20080108 01/08/2008 625 CR3-7 CR3-7-20080206 02/06/2008 306 CR3-7 CR3-7-20080304 03/04/2008 406 CR3-7 CR3-7-20080402 04/02/2008 532 CR3-7 CR3-7-20080504 05/04/2008 229 CR3-7 CR3-7-20080603 06/03/2008 142 U CR3-7 CR3-7-20080708 07/08/2008 518 CR3-7 CR3-7-20080805 08/05/2008 538 CR3-7 CR3-7-20080902 09/02/2008 520 CR3-7 CR3-7-20081007 10/07/2008 536 CR3-7 CR3-7-20081104 11/04/2008 244 CR3-7 CR3-7-20081208 12/08/2008 260 CR3-7 CR3-7-20090106 01/06/2009 143 U CR3-7 CR3-7-20090205 02/05/2009 210 CR3-7 CR3-7-20090303 03/03/2009 301 CR3-7 CR3-7-20090407 04/07/2009 165 CR3-7 CR3-7-20090505 05/05/2009 145 CR3-7 CR3-7-20090601 06/01/2009 279 CR3-7 CR3-7-20090707 07/07/2009 156 CR3-7 CR3-7-20090804 08/04/2009 220 CR3-7 CR3-7-20090901 09/01/2009 208 CR3-7 CR3-7-20091005 10/05/2009 193 CR3-7 CR3-7-20091102 11/02/2009 239 CR3-7 CR3-7-20091201 12/01/2009 311 CR3-7 CR3-7-20100105 01/05/2010 243 CR3-7 CR3-7-20100203 02/03/2010 211 CR3-7 CR3-7-20100304 03/04/2010 155 CR3-7 CR3-7-20100408 04/08/2010 190 CR3-7 CR3-7-20100506 05/06/2010 155 U CR3-7 CR3-7-20100608 06/08/2010 147 U CR3-7 CR3-7-20100707 07/07/2010 146 CR3-7 CR3-7-20100803 08/03/2010 152 CR3-7 CR3-7-20100908 09/08/2010 188 CR3-7 CR3-7-20101005 10/05/2010 229 CR3-7 CR3-7-20101101 11/01/2010 223 CR3-7 CR3-7-20101207 12/07/2010 205 CR3-7 CR3-7-20110106 01/06/2011 165 CR3-7 CR3-7-20110201 02/01/2011 261 CR3-7 CR3-7-20110302 03/02/2011 154 CR3-7 CR3-7-20110405 04/05/2011 127 CR3-7 CR3-7-20110503 05/03/2011 134 CR3-7 CR3-7-20110608 06/08/2011 272 CR3-7 CR3-7-20110705 07/05/2011 177 CR3-7 CR3-7-20110803 08/03/2011 113 CR3-7 CR3-7-20110907 09/07/2011 188 CR3-7 CR3-7-20111005 10/05/2011 162 CR3-7 CR3-7-20111102 11/02/2011 161 CR3-7 CR3-7-20111207 12/07/2011 112 CR3-7 CR3-7-20120104 01/04/2012 177 CR3-7 CR3-7-20120201 02/01/2012 139 CR3-7 CR3-7-20120307 03/07/2012 140 CR3-7 CR3-7-20120403 04/03/2012 139 CR3-7 CR3-7-20120508 05/08/2012 162 HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 27 of 83

PAGE 11 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-7 CR3-7-20120606 06/06/2012 138 CR3-7 CR3-7-20120705 07/05/2012 130 CR3-7 CR3-7-20120806 08/06/2012 96 CR3-7 CR3-7-20120905 09/05/2012 219 CR3-7 CR3-7-20121001 10/01/2012 192 CR3-7 CR3-7-20121107 11/07/2012 238 CR3-7 CR3-7-20121204 12/04/2012 169 CR3-7 CR3-7-20130103 01/03/2013 118 CR3-7 CR3-7-20130206 02/06/2013 142 U CR3-7 CR3-7-20130308 03/08/2013 168 U CR3-7 CR3-7-20130401 04/01/2013 204 CR3-7 CR3-7-20130502 05/02/2013 138 CR3-7 CR3-7-20130604 06/04/2013 126 CR3-7 CR3-7-20130701 07/01/2013 180 CR3-7 CR3-7-20130807 08/07/2013 241 CR3-7 CR3-7-20130903 09/03/2013 133 CR3-7 CR3-7-20131008 10/08/2013 238 CR3-7 CR3-7-20131106 11/06/2013 181 CR3-7 CR3-7-20131205 12/05/2013 139 U CR3-7 CR3-7-20140107 01/07/2014 120 CR3-7 CR3-7-20140207 02/07/2014 143 CR3-7 CR3-7-20140306 03/06/2014 137 CR3-7 CR3-7-20140402 04/02/2014 166 CR3-7 CR3-7-20140508 05/08/2014 88 CR3-7 CR3-7-20140605 06/05/2014 133 CR3-7 CR3-7-20140703 07/03/2014 149 U CR3-7 CR3-7-20140806 08/06/2014 139 U CR3-7 CR3-7-20140904 09/04/2014 131 CR3-7 CR3-7-20141006 10/06/2014 114 CR3-7 CR3-7-20141107 11/07/2014 153 U CR3-7 CR3-7-20141204 12/04/2014 143 CR3-7 CR3-7-20150108 01/08/2015 155 U CR3-7 CR3-7-20150216 02/16/2015 150 U CR3-7 CR3-7-20150416 04/16/2015 163 U CR3-7 CR3-7-20150716 07/16/2015 142 U CR3-7 CR3-7-20151014 10/14/2015 142 U CR3-7 CR3-7-20160121 01/21/2016 152 U CR3-7 CR3-7-20160413 04/13/2016 161 U CR3-7 CR3-7-20160721 07/21/2016 150 U CR3-7 CR3-7-20161013 10/13/2016 155 U CR3-7 CR3-7-20170119 01/19/2017 150 U CR3-7 CR3-7-20170413 04/13/2017 146 U CR3-7 CR3-7-20170718 07/18/2017 153 U CR3-7 CR3-7-20171012 10/12/2017 146 U CR3-7 CR3-7-20180118 01/18/2018 151 U CR3-7 CR3-7-20180412 04/12/2018 155 U CR3-7 CR3-7-20180723 07/23/2018 143 U CR3-7 CR3-7-20181025 10/25/2018 144 U CR3-7 CR3-7-20190117 01/17/2019 141 U CR3-7 CR3-7-20190417 04/17/2019 139 U CR3-7 CR3-7-20190717 07/17/2019 136 U CR3-7 CR3-7-20191014 10/14/2019 141 U CR3-7 CR3-7-20200123 01/23/2020 146 U CR3-7 CR3-7-20200427 04/27/2020 145 U CR3-7 CR3-7-20200701 07/01/2020 137 U CR3-7 CR3-7-20200720 07/20/2020 137 U CR3-7 CR3-7-20201006 10/06/2020 134 U CR3-7 CR3-7-20201216 12/16/2020 134 U CR3-7 CR3-7-20210127 01/27/2021 133 U CR3-7 CR3-7-20210520 05/20/2021 139 U CR3-7 CR3-7-20210609 06/09/2021 139 U CR3-7 CR3-7-20220106 01/06/2022 133 U CR3-7 CR3-7-20220425 04/25/2022 140 U CR3-7 CR3-7-20220715 07/15/2022 136 U CR3-7 CR3-7-20221021 10/21/2022 129 U CR3-7 CR3-7-20230127 01/27/2023 138 U CR3-7 CR3-7-20230412 04/12/2023 137 U CR3-7 CR3-7-20230727 07/27/2023 140 U CR3-7 CR3-7-20231016 10/16/2023 138 U CR3-7 CR3-7-20240125 01/25/2024 135 U CR3-7 CR3-7-20240418 04/18/2024 137 U CR3-7 CR3-7-20240813 08/13/2024 138 U CR3-7 CR3-7-20241016 10/16/2024 142 U CR3-8 CR3-8-20070227 02/27/2007 106 CR3-8 CR3-8-20070404 04/04/2007 132 HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 28 of 83

PAGE 12 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-8 CR3-8-20070504 05/04/2007 126 CR3-8 CR3-8-GEL-20070504 05/04/2007 477 U CR3-8 CR3-8-HEEC-20070504 05/04/2007 334 U CR3-8 CR3-8-20070601 06/01/2007 121 CR3-8 CR3-8-20070703 07/03/2007 220 CR3-8 CR3-8-GEL-20070703 07/03/2007 264 U CR3-8 CR3-8-HEEC-20070703 07/03/2007 297 U CR3-8 CR3-8-20070807 08/07/2007 198 CR3-8 CR3-8-GEL-20070807 08/07/2007 289 U CR3-8 CR3-8-HEEC-20070807 08/07/2007 363 CR3-8 CR3-8-20070904 09/04/2007 213 CR3-8 CR3-8-20071003 10/03/2007 141 CR3-8 CR3-8-20071106 11/06/2007 165 CR3-8 CR3-8-20071204 12/04/2007 112 CR3-8 CR3-8-20080108 01/08/2008 146 CR3-8 CR3-8-20080206 02/06/2008 225 CR3-8 CR3-8-20080304 03/04/2008 188 CR3-8 CR3-8-20080402 04/02/2008 120 CR3-8 CR3-8-20080504 05/04/2008 141 CR3-8 CR3-8-20080603 06/03/2008 142 U CR3-8 CR3-8-20080708 07/08/2008 192 CR3-8 CR3-8-20080805 08/05/2008 174 CR3-8 CR3-8-20080902 09/02/2008 181 CR3-8 CR3-8-20081007 10/07/2008 164 CR3-8 CR3-8-20081104 11/04/2008 167 CR3-8 CR3-8-20081208 12/08/2008 203 CR3-8 CR3-8-20090106 01/06/2009 115 CR3-8 CR3-8-20090205 02/05/2009 222 CR3-8 CR3-8-20090303 03/03/2009 129 CR3-8 CR3-8-20090407 04/07/2009 155 CR3-8 CR3-8-20090505 05/05/2009 154 U CR3-8 CR3-8-20090601 06/01/2009 200 CR3-8 CR3-8-20090707 07/07/2009 142 CR3-8 CR3-8-20090804 08/04/2009 122 CR3-8 CR3-8-20090901 09/01/2009 170 CR3-8 CR3-8-20091005 10/05/2009 137 CR3-8 CR3-8-20091102 11/02/2009 112 CR3-8 CR3-8-20091201 12/01/2009 147 CR3-8 CR3-8-20100105 01/05/2010 142 U CR3-8 CR3-8-20100203 02/03/2010 151 U CR3-8 CR3-8-20100304 03/04/2010 148 U CR3-8 CR3-8-20100408 04/08/2010 126 CR3-8 CR3-8-20100506 05/06/2010 118 CR3-8 CR3-8-20100608 06/08/2010 110 CR3-8 CR3-8-20100707 07/07/2010 145 U CR3-8 CR3-8-20100803 08/03/2010 113 CR3-8 CR3-8-20100908 09/08/2010 103 CR3-8 CR3-8-20101005 10/05/2010 142 CR3-8 CR3-8-20101101 11/01/2010 140 U CR3-8 CR3-8-20101207 12/07/2010 126 CR3-8 CR3-8-20110106 01/06/2011 110 CR3-8 CR3-8-20110201 02/01/2011 142 CR3-8 CR3-8-20110302 03/02/2011 143 U CR3-8 CR3-8-20110405 04/05/2011 141 CR3-8 CR3-8-20110503 05/03/2011 141 U CR3-8 CR3-8-20110608 06/08/2011 138 U CR3-8 CR3-8-20110705 07/05/2011 141 U CR3-8 CR3-8-20110803 08/03/2011 135 CR3-8 CR3-8-20110907 09/07/2011 127 CR3-8 CR3-8-20111005 10/05/2011 89 CR3-8 CR3-8-20111102 11/02/2011 97 CR3-8 CR3-8-20111207 12/07/2011 198 CR3-8 CR3-8-20120104 01/04/2012 147 U CR3-8 CR3-8-20120201 02/01/2012 150 U CR3-8 CR3-8-20120307 03/07/2012 148 U CR3-8 CR3-8-20120403 04/03/2012 132 CR3-8 CR3-8-20120508 05/08/2012 152 CR3-8 CR3-8-20120606 06/06/2012 103 CR3-8 CR3-8-20120705 07/05/2012 169 CR3-8 CR3-8-20120806 08/06/2012 110 CR3-8 CR3-8-20120905 09/05/2012 113 CR3-8 CR3-8-20121001 10/01/2012 158 CR3-8 CR3-8-20121107 11/07/2012 153 CR3-8 CR3-8-20121204 12/04/2012 113 CR3-8 CR3-8-20130103 01/03/2013 101 HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 29 of 83

PAGE 13 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-8 CR3-8-20130206 02/06/2013 126 CR3-8 CR3-8-20130308 03/08/2013 180 CR3-8 CR3-8-20130401 04/01/2013 112 CR3-8 CR3-8-20130502 05/02/2013 181 CR3-8 CR3-8-20130604 06/04/2013 121 CR3-8 CR3-8-20130701 07/01/2013 233 CR3-8 CR3-8-20130807 08/07/2013 197 CR3-8 CR3-8-20130903 09/03/2013 203 CR3-8 CR3-8-20131008 10/08/2013 154 CR3-8 CR3-8-20131106 11/06/2013 102 CR3-8 CR3-8-20131205 12/05/2013 137 CR3-8 CR3-8-20140107 01/07/2014 143 U CR3-8 CR3-8-20140207 02/07/2014 122 CR3-8 CR3-8-20140306 03/06/2014 217 CR3-8 CR3-8-20140402 04/02/2014 111 CR3-8 CR3-8-20140508 05/08/2014 193 CR3-8 CR3-8-20140605 06/05/2014 137 CR3-8 CR3-8-20140703 07/03/2014 153 CR3-8 CR3-8-20140806 08/06/2014 117 CR3-8 CR3-8-20140904 09/04/2014 136 CR3-8 CR3-8-20141006 10/06/2014 114 CR3-8 CR3-8-20141107 11/07/2014 153 U CR3-8 CR3-8-20141204 12/04/2014 138 CR3-8 CR3-8-20150108 01/08/2015 151 U CR3-8 CR3-8-20150216 02/16/2015 172 U CR3-8 CR3-8-20150416 04/16/2015 163 U CR3-8 CR3-8-20150716 07/16/2015 141 U CR3-8 CR3-8-20151014 10/14/2015 140 U CR3-8 CR3-8-20160121 01/21/2016 170 CR3-8 CR3-8-20160413 04/13/2016 152 U CR3-8 CR3-8-20160721 07/21/2016 163 U CR3-8 CR3-8-20161013 10/13/2016 155 U CR3-8 CR3-8-20170119 01/19/2017 159 U CR3-8 CR3-8-20170413 04/13/2017 146 U CR3-8 CR3-8-20170718 07/18/2017 153 U CR3-8 CR3-8-20171012 10/12/2017 146 U CR3-8 CR3-8-20180118 01/18/2018 151 U CR3-8 CR3-8-20180412 04/12/2018 155 U CR3-8 CR3-8-20180723 07/23/2018 143 U CR3-8 CR3-8-20181025 10/25/2018 143 U CR3-8 CR3-8-20190117 01/17/2019 141 U CR3-8 CR3-8-20190417 04/17/2019 139 U CR3-8 CR3-8-20190717 07/17/2019 139 U CR3-8 CR3-8-20191014 10/14/2019 141 U CR3-8 CR3-8-20200123 01/23/2020 139 U CR3-8 CR3-8-20200427 04/27/2020 145 U CR3-8 CR3-8-20200701 07/01/2020 142 U CR3-8 CR3-8-20200720 07/20/2020 142 U CR3-8 CR3-8-20201216 12/16/2020 139 U CR3-8 CR3-8-20210127 01/27/2021 137 U CR3-8 CR3-8-20210520 05/20/2021 140 U CR3-8 CR3-8-20210609 06/09/2021 140 U CR3-8 CR3-8-20220106 01/06/2022 133 U CR3-8 CR3-8-20220425 04/25/2022 140 U CR3-8 CR3-8-20220715 07/15/2022 132 U CR3-8 CR3-8-20230127 01/27/2023 138 U CR3-8 CR3-8-20230412 04/12/2023 137 U CR3-8 CR3-8-20230727 07/27/2023 140 U CR3-8 CR3-8-20231016 10/16/2023 138 U CR3-8 CR3-8-20240125 01/25/2024 137 U CR3-8 CR3-8-20240702 07/02/2024 141 U CR3-8 CR3-8-20241028 10/28/2024 142 U CR3-9 CR3-9-20070227 02/27/2007 143 U CR3-9 CR3-9-20070404 04/04/2007 143 U CR3-9 CR3-9-20070504 05/04/2007 147 U CR3-9 CR3-9-20070601 06/01/2007 136 U CR3-9 CR3-9-20070703 07/03/2007 167 U CR3-9 CR3-9-20070807 08/07/2007 139 U CR3-9 CR3-9-20070904 09/04/2007 130 U CR3-9 CR3-9-20071003 10/03/2007 70 CR3-9 CR3-9-20071106 11/06/2007 146 U CR3-9 CR3-9-20071204 12/04/2007 143 U CR3-9 CR3-9-20080108 01/08/2008 179 CR3-9 CR3-9-20080206 02/06/2008 143 U CR3-9 CR3-9-20080304 03/04/2008 143 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 30 of 83

PAGE 14 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-9 CR3-9-20080402 04/02/2008 145 U CR3-9 CR3-9-20080504 05/04/2008 145 U CR3-9 CR3-9-20080603 06/03/2008 142 U CR3-9 CR3-9-20080708 07/08/2008 144 U CR3-9 CR3-9-20080805 08/05/2008 146 U CR3-9 CR3-9-20080902 09/02/2008 142 U CR3-9 CR3-9-20081007 10/07/2008 139 U CR3-9 CR3-9-20081104 11/04/2008 147 U CR3-9 CR3-9-20081208 12/08/2008 147 U CR3-9 CR3-9-20090106 01/06/2009 143 U CR3-9 CR3-9-20090205 02/05/2009 138 U CR3-9 CR3-9-20090303 03/03/2009 144 U CR3-9 CR3-9-20090407 04/07/2009 147 U CR3-9 CR3-9-20090505 05/05/2009 154 U CR3-9 CR3-9-20090601 06/01/2009 136 U CR3-9 CR3-9-20090707 07/07/2009 110 CR3-9 CR3-9-20090804 08/04/2009 170 U CR3-9 CR3-9-20090901 09/01/2009 165 U CR3-9 CR3-9-20091005 10/05/2009 165 U CR3-9 CR3-9-20091102 11/02/2009 145 U CR3-9 CR3-9-20091201 12/01/2009 90 CR3-9 CR3-9-20100105 01/05/2010 142 U CR3-9 CR3-9-20100203 02/03/2010 151 U CR3-9 CR3-9-20100304 03/04/2010 148 U CR3-9 CR3-9-20100408 04/08/2010 147 U CR3-9 CR3-9-20100506 05/06/2010 155 U CR3-9 CR3-9-20100608 06/08/2010 147 U CR3-9 CR3-9-20100707 07/07/2010 145 U CR3-9 CR3-9-20100803 08/03/2010 145 U CR3-9 CR3-9-20100908 09/08/2010 145 U CR3-9 CR3-9-20101005 10/05/2010 138 U CR3-9 CR3-9-20101101 11/01/2010 140 U CR3-9 CR3-9-20101207 12/07/2010 140 U CR3-9 CR3-9-20110106 01/06/2011 135 U CR3-9 CR3-9-20110201 02/01/2011 139 U CR3-9 CR3-9-20110302 03/02/2011 143 U CR3-9 CR3-9-20110405 04/05/2011 145 U CR3-9 CR3-9-20110503 05/03/2011 141 U CR3-9 CR3-9-20110608 06/08/2011 133 CR3-9 CR3-9-20110705 07/05/2011 87 CR3-9 CR3-9-20110803 08/03/2011 76 CR3-9 CR3-9-20110907 09/07/2011 146 U CR3-9 CR3-9-20111005 10/05/2011 139 U CR3-9 CR3-9-20111102 11/02/2011 138 U CR3-9 CR3-9-20111207 12/07/2011 117 CR3-9 CR3-9-20120104 01/04/2012 147 U CR3-9 CR3-9-20120201 02/01/2012 150 U CR3-9 CR3-9-20120307 03/07/2012 148 U CR3-9 CR3-9-20120403 04/03/2012 103 CR3-9 CR3-9-20120508 05/08/2012 138 U CR3-9 CR3-9-20120606 06/06/2012 146 U CR3-9 CR3-9-20120705 07/05/2012 92 CR3-9 CR3-9-20120806 08/06/2012 139 U CR3-9 CR3-9-20120905 09/05/2012 141 U CR3-9 CR3-9-20121001 10/01/2012 150 U CR3-9 CR3-9-20121107 11/07/2012 98 CR3-9 CR3-9-20121204 12/04/2012 79 CR3-9 CR3-9-20130103 01/03/2013 128 CR3-9 CR3-9-20130206 02/06/2013 142 U CR3-9 CR3-9-20130308 03/08/2013 140 U CR3-9 CR3-9-20130401 04/01/2013 139 U CR3-9 CR3-9-20130502 05/02/2013 74 CR3-9 CR3-9-20130604 06/04/2013 138 U CR3-9 CR3-9-20130701 07/01/2013 136 U CR3-9 CR3-9-20130807 08/07/2013 138 U CR3-9 CR3-9-20130903 09/03/2013 134 U CR3-9 CR3-9-20131008 10/08/2013 143 U CR3-9 CR3-9-20131106 11/06/2013 143 U CR3-9 CR3-9-20131205 12/05/2013 139 U CR3-9 CR3-9-20140107 01/07/2014 143 U CR3-9 CR3-9-20140207 02/07/2014 136 U CR3-9 CR3-9-20140306 03/06/2014 133 U CR3-9 CR3-9-20140402 04/02/2014 139 U CR3-9 CR3-9-20140508 05/08/2014 138 U CR3-9 CR3-9-20140605 06/05/2014 135 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 31 of 83

PAGE 15 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-9 CR3-9-20140703 07/03/2014 146 U CR3-9 CR3-9-20140806 08/06/2014 139 U CR3-9 CR3-9-20140904 09/04/2014 144 U CR3-9 CR3-9-20141006 10/06/2014 148 U CR3-9 CR3-9-20141107 11/07/2014 141 U CR3-9 CR3-9-20141204 12/04/2014 140 U CR3-9 CR3-9-20150108 01/08/2015 151 U CR3-9 CR3-9-20150216 02/16/2015 150 U CR3-9 CR3-9-20150416 04/16/2015 150 U CR3-9 CR3-9-20150716 07/16/2015 142 U CR3-9 CR3-9-20151014 10/14/2015 142 U CR3-9 CR3-9-20160121 01/21/2016 148 U CR3-9 CR3-9-20160413 04/13/2016 153 U CR3-9 CR3-9-20160721 07/21/2016 150 U CR3-9 CR3-9-20161013 10/13/2016 161 U CR3-9 CR3-9-20170119 01/19/2017 148 U CR3-9 CR3-9-20170413 04/13/2017 140 U CR3-9 CR3-9-20170718 07/18/2017 153 U CR3-9 CR3-9-20171012 10/12/2017 146 U CR3-9 CR3-9-20180118 01/18/2018 151 U CR3-9 CR3-9-20180412 04/12/2018 155 U CR3-9 CR3-9-20180723 07/23/2018 143 U CR3-9 CR3-9-20181025 10/25/2018 144 U CR3-9 CR3-9-20190117 01/17/2019 141 U CR3-9 CR3-9-20190417 04/17/2019 139 U CR3-9 CR3-9-20190717 07/17/2019 136 U CR3-9 CR3-9-20191014 10/14/2019 141 U CR3-9 CR3-9-20200123 01/23/2020 146 U CR3-9 CR3-9-20200427 04/27/2020 136 U CR3-9 CR3-9-20200701 07/01/2020 137 U CR3-9 CR3-9-20200720 07/20/2020 137 U CR3-9 CR3-9-20201216 12/16/2020 139 U CR3-9 CR3-9-20210127 01/27/2021 133 U CR3-9 CR3-9-20210520 05/20/2021 141 U CR3-9 CR3-9-20210928 09/28/2021 136 U CR3-9 CR3-9-20220425 04/25/2022 140 U CR3-9 CR3-9-20220715 07/15/2022 132 U CR3-9 CR3-9-20221021 10/21/2022 129 U CR3-9 CR3-9-20230127 01/27/2023 137 U CR3-9 CR3-9-20230412 04/12/2023 137 U CR3-9 CR3-9-20230727 07/27/2023 140 U CR3-9 CR3-9-20231016 10/16/2023 138 U CR3-9 CR3-9-20240125 01/25/2024 135 U CR3-9 CR3-9-20240418 04/18/2024 137 U CR3-9 CR3-9-20240727 07/27/2024 139 U CR3-9 CR3-9-20241028 10/28/2024 142 U CR3-10 CR3-10-20070227 02/27/2007 143 U CR3-10 CR3-10-20070404 04/04/2007 143 U CR3-10 CR3-10-20070703 07/03/2007 167 U CR3-10 CR3-10-20070904 09/04/2007 167 U CR3-10 CR3-10-20071003 10/03/2007 134 U CR3-10 CR3-10-20080108 01/08/2008 140 U CR3-10 CR3-10-20080401 04/01/2008 145 U CR3-10 CR3-10-20080708 07/08/2008 139 U CR3-10 CR3-10-20081007 10/07/2008 146 U CR3-10 CR3-10-20090106 01/06/2009 143 U CR3-10 CR3-10-20090407 04/07/2009 147 U CR3-10 CR3-10-20090707 07/07/2009 143 U CR3-10 CR3-10-20091013 10/13/2009 150 U CR3-10 CR3-10-20100105 01/05/2010 142 U CR3-10 CR3-10-20100408 04/08/2010 147 U CR3-10 CR3-10-20100707 07/07/2010 145 U CR3-10 CR3-10-20101005 10/05/2010 76 CR3-10 CR3-10-20110106 01/06/2011 97 CR3-10 CR3-10-20110405 04/05/2011 145 U CR3-10 CR3-10-20110705 07/05/2011 141 U CR3-10 CR3-10-20111005 10/05/2011 139 U CR3-10 CR3-10-20120104 01/04/2012 147 U CR3-10 CR3-10-20120403 04/03/2012 78 CR3-10 CR3-10-20120705 07/05/2012 112 CR3-10 CR3-10-20121001 10/01/2012 138 U CR3-10 CR3-10-20130103 01/03/2013 142 U CR3-10 CR3-10-20130401 04/01/2013 138 U CR3-10 CR3-10-20130701 07/01/2013 136 U CR3-10 CR3-10-20131008 10/08/2013 147 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 32 of 83

PAGE 16 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled CR3-10 CR3-10-20140113 01/13/2014 135 U CR3-10 CR3-10-20140402 04/02/2014 142 U CR3-10 CR3-10-20140703 07/03/2014 146 U CR3-10 CR3-10-20141014 10/14/2014 145 U CR3-10 CR3-10-20150122 01/22/2015 153 U CR3-10 CR3-10-20150416 04/16/2015 153 U CR3-10 CR3-10-20150716 07/16/2015 142 U CR3-10 CR3-10-20151014 10/14/2015 149 U CR3-10 CR3-10-20160121 01/21/2016 151 U CR3-10 CR3-10-20160413 04/13/2016 153 U CR3-10 CR3-10-20160721 07/21/2016 167 U CR3-10 CR3-10-20161013 10/13/2016 155 U CR3-10 CR3-10-20170119 01/19/2017 159 U CR3-10 CR3-10-20170414 04/14/2017 140 U CR3-10 CR3-10-20170718 07/18/2017 153 U CR3-10 CR3-10-20171012 10/12/2017 146 U CR3-10 CR3-10-20180111 01/11/2018 152 U CR3-10 CR3-10-20180412 04/12/2018 155 U CR3-10 CR3-10-20180719 07/19/2018 143 U CR3-10 CR3-10-20181025 10/25/2018 144 U CR3-10 CR3-10-20190117 01/17/2019 141 U CR3-10 CR3-10-20190417 04/17/2019 139 U CR3-10 CR3-10-20190717 07/17/2019 139 U CR3-10 CR3-10-20191014 10/14/2019 141 U CR3-10 CR3-10-20200123 01/23/2020 146 U CR3-10 CR3-10-20200427 04/27/2020 136 U CR3-10 CR3-10-20200720 07/20/2020 139 U CR3-10 CR3-10-20201006 10/06/2020 139 U CR3-10 CR3-10-20201216 12/16/2020 139 U CR3-10 CR3-10-20210127 01/27/2021 133 U CR3-10 CR3-10-20210520 05/20/2021 141 U CR3-10 CR3-10-20210928 09/28/2021 136 U CR3-10 CR3-10-20211228 12/28/2021 133 U CR3-10 CR3-10-20220104 01/04/2022 133 U CR3-10 CR3-10-20220425 04/25/2022 137 U CR3-10 CR3-10-20220715 07/15/2022 136 U CR3-10 CR3-10-20221021 10/21/2022 134 U CR3-10 CR3-10-20230127 01/27/2023 137 U CR3-10 CR3-10-20230412 04/12/2023 137 U CR3-10 CR3-10-20230727 07/27/2023 140 U CR3-10 CR3-10-20231016 10/16/2023 139 U CR3-10 CR3-10R-20240125 01/25/2024 135 U CR3-10 CR3-10R-20240418 04/18/2024 138 U CR3-10 CR3-10R-20240702 07/02/2024 141 U CR3-10 CR3-10R-20241016 10/16/2024 142 U MWC-IF2 MWC-IF2-20070404 04/04/2007 287 MWC-IF2 MWC-IF2-20070504 05/04/2007 270 MWC-IF2 MWC-IF2-GEL-20070504 05/04/2007 665 MWC-IF2 MWC-IF2-HEEC-20070504 05/04/2007 333 U MWC-IF2 MWC-IF2-20070601 06/01/2007 428 MWC-IF2 MWC-IF2-20070703 07/03/2007 481 MWC-IF2 MWC-IF2-GEL-20070703 07/03/2007 443 MWC-IF2 MWC-IF2-HEEC-20070703 07/03/2007 394 MWC-IF2 MWC-IF2-20070807 08/07/2007 274 MWC-IF2 MWC-IF2-GEL-20070807 08/07/2007 284 U MWC-IF2 MWC-IF2-HEEC-20070807 08/07/2007 506 MWC-IF2 MWC-IF2-20070904 09/04/2007 415 MWC-IF2 MWC-IF2-20071003 10/03/2007 428 MWC-IF2 MWC-IF2-20071106 11/06/2007 290 MWC-IF2 MWC-IF2-20071204 12/04/2007 332 MWC-IF2 MWC-IF2-20080108 01/08/2008 345 MWC-IF2 MWC-IF2-20080206 02/06/2008 344 MWC-IF2 MWC-IF2-20080304 03/04/2008 256 MWC-IF2 MWC-IF2-20080402 04/02/2008 318 MWC-IF2 MWC-IF2-20080504 05/04/2008 365 MWC-IF2 MWC-IF2-20080603 06/03/2008 395 MWC-IF2 MWC-IF2-20080708 07/08/2008 310 MWC-IF2 MWC-IF2-20080805 08/05/2008 146 U MWC-IF2 MWC-IF2-20080902 09/02/2008 142 U MWC-IF2 MWC-IF2-20081007 10/07/2008 325 MWC-IF2 MWC-IF2-20081104 11/04/2008 193 MWC-IF2 MWC-IF2-20081208 12/08/2008 222 MWC-IF2 MWC-IF2-20090106 01/06/2009 86 MWC-IF2 MWC-IF2-20090205 02/05/2009 191 MWC-IF2 MWC-IF2-20090303 03/03/2009 243 HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 33 of 83

PAGE 17 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled MWC-IF2 MWC-IF2-20090407 04/07/2009 179 MWC-IF2 MWC-IF2-20090505 05/05/2009 253 MWC-IF2 MWC-IF2-20090601 06/01/2009 218 MWC-IF2 MWC-IF2-20090707 07/07/2009 259 MWC-IF2 MWC-IF2-20090804 08/04/2009 277 MWC-IF2 MWC-IF2-20090901 09/01/2009 238 MWC-IF2 MWC-IF2-20091005 10/05/2009 198 MWC-IF2 MWC-IF2-20091102 11/02/2009 202 MWC-IF2 MWC-IF2-20091201 12/01/2009 205 MWC-IF2 MWC-IF2-20100105 01/05/2010 169 MWC-IF2 MWC-IF2-20100203 02/03/2010 122 MWC-IF2 MWC-IF2-20100304 03/04/2010 129 MWC-IF2 MWC-IF2-20100408 04/08/2010 121 MWC-IF2 MWC-IF2-20100506 05/06/2010 113 MWC-IF2 MWC-IF2-20100608 06/08/2010 153 MWC-IF2 MWC-IF2-20100707 07/07/2010 145 U MWC-IF2 MWC-IF2-20100803 08/03/2010 181 MWC-IF2 MWC-IF2-20100908 09/08/2010 145 U MWC-IF2 MWC-IF2-20101005 10/05/2010 138 U MWC-IF2 MWC-IF2-20101101 11/01/2010 104 MWC-IF2 MWC-IF2-20101207 12/07/2010 140 U MWC-IF2 MWC-IF2-20110106 01/06/2011 181 MWC-IF2 MWC-IF2-20110201 02/01/2011 124 MWC-IF2 MWC-IF2-20110302 03/02/2011 143 U MWC-IF2 MWC-IF2-20110405 04/05/2011 145 U MWC-IF2 MWC-IF2-20110503 05/03/2011 132 MWC-IF2 MWC-IF2-20110608 06/08/2011 135 MWC-IF2 MWC-IF2-20110705 07/05/2011 141 U MWC-IF2 MWC-IF2-20110803 08/03/2011 143 U MWC-IF2 MWC-IF2-20110907 09/07/2011 135 MWC-IF2 MWC-IF2-20111005 10/05/2011 139 U MWC-IF2 MWC-IF2-20111102 11/02/2011 92 MWC-IF2 MWC-IF2-20111207 12/07/2011 180 MWC-IF2 MWC-IF2-20120104 01/04/2012 147 U MWC-IF2 MWC-IF2-20120201 02/01/2012 103 MWC-IF2 MWC-IF2-20120307 03/07/2012 109 MWC-IF2 MWC-IF2-20120403 04/03/2012 97 MWC-IF2 MWC-IF2-20120508 05/08/2012 115 MWC-IF2 MWC-IF2-20120606 06/06/2012 146 U MWC-IF2 MWC-IF2-20120705 07/05/2012 144 U MWC-IF2 MWC-IF2-20120806 08/06/2012 139 U MWC-IF2 MWC-IF2-20120905 09/05/2012 141 U MWC-IF2 MWC-IF2-20121001 10/01/2012 182 MWC-IF2 MWC-IF2-20121107 11/07/2012 95 MWC-IF2 MWC-IF2-20121204 12/04/2012 174 MWC-IF2 MWC-IF2-20130103 01/03/2013 135 MWC-IF2 MWC-IF2-20130206 02/06/2013 168 U MWC-IF2 MWC-IF2-20130308 03/08/2013 133 MWC-IF2 MWC-IF2-20130401 04/01/2013 181 MWC-IF2 MWC-IF2-20130502 05/02/2013 135 U MWC-IF2 MWC-IF2-20130604 06/04/2013 138 U MWC-IF2 MWC-IF2-20130701 07/01/2013 208 MWC-IF2 MWC-IF2-20130807 08/07/2013 95 MWC-IF2 MWC-IF2-20130903 09/03/2013 150 MWC-IF2 MWC-IF2-20131008 10/08/2013 218 MWC-IF2 MWC-IF2-20131106 11/06/2013 143 U MWC-IF2 MWC-IF2-20131205 12/05/2013 139 U MWC-IF2 MWC-IF2-20140107 01/07/2014 143 U MWC-IF2 MWC-IF2-20140207 02/07/2014 135 U MWC-IF2 MWC-IF2-20140306 03/06/2014 133 U MWC-IF2 MWC-IF2-20140402 04/02/2014 144 MWC-IF2 MWC-IF2-20140508 05/08/2014 138 U MWC-IF2 MWC-IF2-20140605 06/05/2014 135 U MWC-IF2 MWC-IF2-20140703 07/03/2014 146 U MWC-IF2 MWC-IF2-20140806 08/06/2014 146 U MWC-IF2 MWC-IF2-20140904 09/04/2014 144 U MWC-IF2 MWC-IF2-20141006 10/06/2014 148 U MWC-IF2 MWC-IF2-20141107 11/07/2014 140 U MWC-IF2 MWC-IF2-20141204 12/04/2014 87 MWC-IF2 MWC-IF2-20150108 01/08/2015 151 U MWC-IF2 MWC-IF2-20150216 02/16/2015 172 U MWC-IF2 MWC-IF2-20150416 04/16/2015 150 U MWC-IF2 MWC-IF2-20150716 07/16/2015 142 U MWC-IF2 MWC-IF2-20151014 10/14/2015 142 U MWC-IF2 MWC-IF2-20160121 01/21/2016 152 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 34 of 83

PAGE 18 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled MWC-IF2 MWC-IF2-20160413 04/13/2016 152 U MWC-IF2 MWC-IF2-20160721 07/21/2016 150 U MWC-IF2 MWC-IF2-20161013 10/13/2016 155 U MWC-IF2 MWC-IF2-20170119 01/19/2017 148 U MWC-IF2 MWC-IF2-20170413 04/13/2017 140 U MWC-IF2 MWC-IF2-20170718 07/18/2017 148 U MWC-IF2 MWC-IF2-20171012 10/12/2017 146 U MWC-IF2 MWC-IF2-20180118 01/18/2018 152 U MWC-IF2 MWC-IF2-20180412 04/12/2018 155 U MWC-IF2 MWC-IF2-20180723 07/23/2018 143 U MWC-IF2 MWC-IF2-20181025 10/25/2018 144 U MWC-IF2 MWC-IF2-20190117 01/17/2019 146 U MWC-IF2 MWC-IF2-20190417 04/17/2019 139 U MWC-IF2 MWC-IF2-20190717 07/17/2019 139 U MWC-IF2 MWC-IF2-20191014 10/14/2019 141 U MWC-IF2 MWC-IF2-20200123 01/23/2020 139 U MWC-IF2 MWC-IF2-20200427 04/27/2020 136 U MWC-IF2 MWC-IF2-20200701 07/01/2020 137 U MWC-IF2 MWC-IF2-20201216 12/16/2020 139 U MWC-IF2 MWC-IF2-20210127 01/27/2021 133 U MWC-IF2 MWC-IF2-20210520 05/20/2021 139 U MWC-IF2 MWC-IF2-20210928 09/28/2021 136 U MWC-IF2 MWC-IF2-20220106 01/06/2022 132 U MWC-IF2 MWC-IF2-20220425 04/25/2022 140 U MWC-IF2 MWC-IF2-20220715 07/15/2022 132 U MWC-IF2 MWC-IF2-20221021 10/21/2022 132 U MWC-IF2 MWC-IF2-20230127 01/27/2023 137 U MWC-IF2 MWC-IF2-20230412 04/12/2023 137 U MWC-IF2 MWC-IF2-20230727 07/27/2023 139 U MWC-IF2 MWC-IF2-20231016 10/16/2023 135 U MWC-IF2 MWC-IF2-20240727 07/27/2024 139 U MWC-IF2 MWC-IF2-20241016 10/16/2024 142 U MWC-27 MWC-27-20070404 04/04/2007 1199 MWC-27 MWC-27-20070504 05/04/2007 1072 MWC-27 MWC-27-GEL-20070504 05/04/2007 1280 MWC-27 MWC-27-HEEC-20070504 05/04/2007 336 U MWC-27 MWC-27-20070601 06/01/2007 968 MWC-27 MWC-27-20070703 07/03/2007 960 MWC-27 MWC-27-GEL-20070703 07/03/2007 715 MWC-27 MWC-27-HEEC-20070703 07/03/2007 761 MWC-27 MWC-27-20070807 08/07/2007 495 MWC-27 MWC-27-GEL-20070807 08/07/2007 408 MWC-27 MWC-27-HEEC-20070807 08/07/2007 611 MWC-27 MWC-27-20070904 09/04/2007 475 MWC-27 MWC-27-20071003 10/03/2007 551 MWC-27 MWC-27-20071106 11/06/2007 417 MWC-27 MWC-27-20071204 12/04/2007 442 MWC-27 MWC-27-20080108 01/08/2008 486 MWC-27 MWC-27-20080206 02/06/2008 392 MWC-27 MWC-27-20080304 03/04/2008 197 MWC-27 MWC-27-20080402 04/02/2008 182 MWC-27 MWC-27-20080504 05/04/2008 186 MWC-27 MWC-27-20080603 06/03/2008 142 U MWC-27 MWC-27-20080708 07/08/2008 111 MWC-27 MWC-27-20080805 08/05/2008 89 MWC-27 MWC-27-20080902 09/02/2008 142 U MWC-27 MWC-27-20081007 10/07/2008 233 MWC-27 MWC-27-20081104 11/04/2008 195 MWC-27 MWC-27-20081208 12/08/2008 147 U MWC-27 MWC-27-20090106 01/06/2009 139 MWC-27 MWC-27-20090205 02/05/2009 138 U MWC-27 MWC-27-20090303 03/03/2009 134 MWC-27 MWC-27-20090407 04/07/2009 104 MWC-27 MWC-27-20090505 05/05/2009 109 MWC-27 MWC-27-20090601 06/01/2009 146 U MWC-27 MWC-27-20090707 07/07/2009 134 MWC-27 MWC-27-20090804 08/04/2009 159 U MWC-27 MWC-27-20090901 09/01/2009 156 MWC-27 MWC-27-20091005 10/05/2009 611 MWC-27 MWC-27-20091102 11/02/2009 469 MWC-27 MWC-27-20091201 12/01/2009 236 MWC-27 MWC-27-20100105 01/05/2010 183 MWC-27 MWC-27-20100203 02/03/2010 170 MWC-27 MWC-27-20100304 03/04/2010 148 U MWC-27 MWC-27-20100408 04/08/2010 147 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 35 of 83

PAGE 19 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled MWC-27 MWC-27-20100506 05/06/2010 155 U MWC-27 MWC-27-20100608 06/08/2010 147 U MWC-27 MWC-27-20100707 07/07/2010 145 U MWC-27 MWC-27-20100803 08/03/2010 145 U MWC-27 MWC-27-20100908 09/08/2010 145 U MWC-27 MWC-27-20101005 10/05/2010 140 U MWC-27 MWC-27-20101101 11/01/2010 140 U MWC-27 MWC-27-20101207 12/07/2010 140 U MWC-27 MWC-27-20110106 01/06/2011 137 U MWC-27 MWC-27-20110201 02/01/2011 139 U MWC-27 MWC-27-20110302 03/02/2011 143 U MWC-27 MWC-27-20110405 04/05/2011 145 U MWC-27 MWC-27-20110503 05/03/2011 141 U MWC-27 MWC-27-20110608 06/08/2011 138 U MWC-27 MWC-27-20110705 07/05/2011 141 U MWC-27 MWC-27-20110803 08/03/2011 143 U MWC-27 MWC-27-20110907 09/07/2011 146 U MWC-27 MWC-27-20111005 10/05/2011 139 U MWC-27 MWC-27-20111102 11/02/2011 138 U MWC-27 MWC-27-20111207 12/07/2011 211 MWC-27 MWC-27-20120104 01/04/2012 147 U MWC-27 MWC-27-20120201 02/01/2012 150 U MWC-27 MWC-27-20120307 03/07/2012 148 U MWC-27 MWC-27-20120403 04/03/2012 140 U MWC-27 MWC-27-20120508 05/08/2012 142 MWC-27 MWC-27-20120606 06/06/2012 146 U MWC-27 MWC-27-20120705 07/05/2012 144 U MWC-27 MWC-27-20120806 08/06/2012 139 U MWC-27 MWC-27-20120905 09/05/2012 141 U MWC-27 MWC-27-20121001 10/01/2012 135 U MWC-27 MWC-27-20121107 11/07/2012 137 U MWC-27 MWC-27-20121204 12/04/2012 108 MWC-27 MWC-27-20130103 01/03/2013 150 MWC-27 MWC-27-20130206 02/06/2013 208 MWC-27 MWC-27-20130308 03/08/2013 101 MWC-27 MWC-27-20130401 04/01/2013 254 MWC-27 MWC-27-20130502 05/02/2013 139 U MWC-27 MWC-27-20130604 06/04/2013 138 U MWC-27 MWC-27-20130701 07/01/2013 136 U MWC-27 MWC-27-20130807 08/07/2013 125 MWC-27 MWC-27-20130903 09/03/2013 134 U MWC-27 MWC-27-20131008 10/08/2013 143 U MWC-27 MWC-27-20131106 11/06/2013 143 U MWC-27 MWC-27-20131205 12/05/2013 139 U MWC-27 MWC-27-20140107 01/07/2014 143 U MWC-27 MWC-27-20140207 02/07/2014 136 U MWC-27 MWC-27-20140306 03/06/2014 133 U MWC-27 MWC-27-20140402 04/02/2014 141 U MWC-27 MWC-27-20140508 05/08/2014 138 U MWC-27 MWC-27-20140605 06/05/2014 135 U MWC-27 MWC-27-20140703 07/03/2014 146 U MWC-27 MWC-27-20140806 08/06/2014 139 U MWC-27 MWC-27-20140904 09/04/2014 144 U MWC-27 MWC-27-20141006 10/06/2014 148 U MWC-27 MWC-27-20141107 11/07/2014 141 U MWC-27 MWC-27-20141204 12/04/2014 97 MWC-27 MWC-27-20150108 01/08/2015 151 U MWC-27 MWC-27-20150216 02/16/2015 172 U MWC-27 MWC-27-20150416 04/16/2015 150 U MWC-27 MWC-27-20150716 07/16/2015 142 U MWC-27 MWC-27-20151014 10/14/2015 140 U MWC-27 MWC-27-20160121 01/21/2016 125 MWC-27 MWC-27-20160413 04/13/2016 152 U MWC-27 MWC-27-20160721 07/21/2016 150 U MWC-27 MWC-27-20161013 10/13/2016 161 U MWC-27 MWC-27-20170119 01/19/2017 159 U MWC-27 MWC-27-20170413 04/13/2017 140 U MWC-27 MWC-27-20170718 07/18/2017 148 U MWC-27 MWC-27-20171012 10/12/2017 158 U MWC-27 MWC-27-20180118 01/18/2018 152 U MWC-27 MWC-27-20180412 04/12/2018 154 U MWC-27 MWC-27-20180723 07/23/2018 143 U MWC-27 MWC-27-20181025 10/25/2018 144 U MWC-27 MWC-27-20190117 01/17/2019 146 U MWC-27 MWC-27-20190417 04/17/2019 139 U HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 36 of 83

PAGE 20 OF 20 TABLE 3 GPP GROUNDWATER ANALYTICAL DATA

SUMMARY

- 2007 THROUGH 2024 CRYSTAL RIVER NUCLEAR PLANT UNIT 3 CRYSTAL RIVER, FLORIDA Tritium pCi/L Location Sample Name Date Sampled MWC-27 MWC-27-20190717 07/17/2019 139 U MWC-27 MWC-27-20191014 10/14/2019 141 U MWC-27 MWC-27-20200123 01/23/2020 146 U MWC-27 MWC-27-20200427 04/27/2020 136 U MWC-27 MWC-27-20200701 07/01/2020 139 U MWC-27 MWC-27-20201216 12/16/2020 137 U MWC-27 MWC-27-20210127 01/27/2021 137 U MWC-27 MWC-27-20210520 05/20/2021 141 U MWC-27 MWC-27-20210928 09/28/2021 136 U MWC-27 MWC-27-20220106 01/06/2022 133 U MWC-27 MWC-27-20220425 04/25/2022 140 U MWC-27 MWC-27-20220715 07/15/2022 136 U MWC-27 MWC-27-20221021 10/21/2022 134 U MWC-27 MWC-27-20230127 01/27/2023 136 U MWC-27 MWC-27-20230412 04/12/2023 137 U MWC-27 MWC-27-20230727 07/27/2023 139 U MWC-27 MWC-27-20231016 10/16/2023 138 U MWC-27 MWC-27-20240418 04/18/2024 137 U MWC-27 MWC-27-20240727 07/27/2024 141 U MWC-27 MWC-27-20241016 10/16/2024 142 U Notes:

-: Not Analyzed pCi/L: picoCurie per Liter U: Not detected, value is the laboratory reporting limit

- Bold values indicate a concentration detected above the Minimum Detectable Concentration.

HALEY & ALDRICH, INC.

MAY 2025 3F1025-01 / Enclosure 5 / Page 37 of 83

FIGURES 3F1025-01 / Enclosure 5 / Page 38 of 83

SITE 82°41'0"W 82°42'0"W 82°43'0"W 28°58'0"N 28°57'0"N GIS FILE PATH: \\\\haleyaldrich.com\\share\\CF\\Projects\\134300\\GIS\\Maps\\2023_05\\134300_010_0001_PROJECT_LOCUS.mxd USER: dverrier LAST SAVED: 12/16/2022 3:11:22 PM MAP SOURCE: ESRI SITE COORDINATES: 28°57'32"N, 82°41'46"W CRYSTAL RIVER 3 NUCLEAR POWER PLANT 15760 POWERLINE STREET CRYSTAL RIVER, FLORIDA PROJECT LOCUS FIGURE 1 APPROXIMATE SCALE: 1 IN = 2000 FT MAY 2023 FL 3F1025-01 / Enclosure 5 / Page 39 of 83

ASH STORAGE AREA COAL STORAGE AREA COOLING TOWER UNIT 4 COOLING TOWER UNIT 5 FOSSIL PLANT ADMINISTRATION CENTRAL WAREHOUSE/

SITE SUPPORT MAINTENANCE/

FLEET SERVICES UNIT 5 UNIT 4 ADMINISTRATION BUILDING DISCHARGE CANAL HELPER COOLING TOWERS INTAKE CANAL OIL TANKS UNITS 1 AND 2 INTAKE STRUCTURE UNIT 2 UNIT 1 CONTROL ROOM OFFICE BUILDING ADMINISTRATION BUILDING SITE ADMINISTRATION BUILDING WAREHOUSE TURBINE BUILDING AND AUXILIARY BUILDING UNIT 3 REACTOR BUILDING R.B. MAINTENANCE BUILDING DEMIN.

WATER TANK COAL STORAGE AREA PRECIPITATOR DISCHARGE STRUCTURE TECHNICAL SUPPORT BUILDING WAREHOUSE UNIT 3 INTAKE STRUCTURE WATER TREATMENT BUILDING SETTLING PONDS FORMER FIRING RANGE NOTES

1. ALL LOCATIONS AND DIMENSIONS ARE APPROXIMATE.

2. AERIAL IMAGERY SOURCE: ESRI CRYSTAL RIVER 3 NUCLEAR POWER PLANT 15760 POWERLINE STREET CRYSTAL RIVER, FLORIDA SITE PLAN FIGURE 2 SCALE: AS SHOWN MAY 2023 LEGEND PROTECTED AREA FENCE SITE BOUNDARY GIS FILE PATH: \\\\haleyaldrich.com\\share\\CF\\Projects\\134300\\GIS\\Maps\\2023_05\\134300_010_0002_SITE_PLAN.mxd USER: dverrier LAST SAVED: 5/4/2023 9:49:41 AM 0

1,100 2,200 SCALE IN FEET

3. SITE CONDITIONS CIRCA MAY 2023 3F1025-01 / Enclosure 5 / Page 40 of 83

?

MW-POS-24 MW-18 MW03 MW04 MW01 MW02 MW07 CR3-1S CR3-1D CR3-2 CR3-3S CR3-3D CR3-5 CR3-6S CR3-6D CR3-7 CR3-8 CR3-9 CR3-10 CR3-14 CR3-13 MWC-1 TWI-1R TWI-2R TWI-3 TWI-4 CCRW-2 CCRW-7 CR3-4 CR3-15 MWC-21R CCRW-3 MWC-16 MWC-1F2 MW-POS-22 MWC-27 CCRW-21 CCRW-29 NOTES

1. ALL LOCATIONS AND DIMENSIONS ARE APPROXIMATE.

2. AERIAL IMAGERY SOURCE: ESRI CRYSTAL RIVER 3 NUCLEAR POWER PLANT 15760 POWERLINE STREET CRYSTAL RIVER, FLORIDA MONITORING WELL LOCATIONS FIGURE 3 SCALE: AS SHOWN MAY 2023 LEGEND

?

MONITORING WELL WELL CURRENTLY SAMPLED AS PART OF THE REMP (RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM)

AND GPP (GROUNDWATER PROTECTION PROGRAM)

WELL CURRENTLY SAMPLED AS PART OF GPP PROTECTED AREA FENCE SITE BOUNDARY GIS FILE PATH: \\\\haleyaldrich.com\\share\\CF\\Projects\\134300\\GIS\\Maps\\2023_05\\134300_013_0003_WELL_LOCATION_PLAN.mxd USER: dverrier LAST SAVED: 5/5/2023 11:43:54 AM 0

1,000 2,000 SCALE IN FEET

3. SITE CONDITIONS CIRCA MAY 2023 3F1025-01 / Enclosure 5 / Page 41 of 83

?

MW-POS-24 MW-18 MW03 MW04 MW01 MW02 MW07 MW05 CR3-1S CR3-1D CR3-2 CR3-3S CR3-3D CR3-5 CR3-6S CR3-6D CR3-7 CR3-8 CR3-9 CR3-10 CR3-14 CR3-13 MWC-1 TWI-1R TWI-2R TWI-3 TWI-4 CCRW-2 CCRW-7 CR3-4 CR3-15 MWC-21R CCRW-3 MWC-16 MWC-1F2 MW-POS-22 MWC-27 CCRW-21 CCRW-29 NOTES

1. ALL LOCATIONS AND DIMENSIONS ARE APPROXIMATE.

2. pCi/L = PICOCURIES PER LITER

3. AERIAL IMAGERY SOURCE: ESRI CRYSTAL RIVER 3 NUCLEAR POWER PLANT 15760 POWERLINE STREET CRYSTAL RIVER, FLORIDA GROUNDWATER SAMPLE RESULTS FIGURE 4 SCALE: AS SHOWN MAY 2023 LEGEND

?

MONITORING WELL

?

MONITORING WELL WITH TRITIUM DETECTED > 1,000 pCi/L WELL CURRENTLY SAMPLED AS PART OF THE REMP (RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM)

AND GPP (GROUNDWATER PROTECTION PROGRAM)

WELL CURRENTLY SAMPLED AS PART OF GPP PROTECTED AREA FENCE SITE BOUNDARY GIS FILE PATH: \\\\haleyaldrich.com\\share\\CF\\Projects\\134300\\GIS\\Maps\\2023_05\\134300_013_0004_GW_SAMPLE_RESULTS.mxd USER: dverrier LAST SAVED: 5/5/2023 11:48:12 AM 0

1,000 2,000 SCALE IN FEET

4. SITE CONDITIONS CIRCA MAY 2023 3F1025-01 / Enclosure 5 / Page 42 of 83

APPENDIX A CR3 Groundwater Flow Study Summary Report (GHS)

(Please note: links that previously provided access to raw groundwater elevation data/transducer files are no longer active) 3F1025-01 / Enclosure 5 / Page 43 of 83

GHS Environmental PO Box 55802 St. Petersburg, FL 33732-5802 727-667-6786 PO Box 55802, St. Petersburg FL 33732-5802 #727-667-6786 April 26, 2017 Mr. Charles Burtoff Lead Specialist Duke Energy Florida 15760 West Power Line St.

Crystal River Unit 3 MAC NA2B Crystal River, FL 34428 Re.:

2016 CR3 Groundwater Flow Study DRAFT Summary Report

Dear Mr. Burtoff,

DUKE Energy Florida (DUKE) requested that GHS Environmental (GHS) conduct a detailed groundwater flow study for the area surrounding Power Generation Unit 3 (CR3) at the Crystal River Energy Complex in Crystal River, Florida. Groundwater elevation data was collected for one full moon period (November 2016 through December 2016), and the results and conclusions are provided in the attached summary report. All raw data is included as electronic files embedded in this report.

We thank you for allowing GHS Environmental to provide our services and greatly appreciate the opportunity to submit this report to you. Please do not hesitate to call us at (727) 667-6786 with any questions you might have concerning this information. In closing, we appreciate being asked to provide assistance and look forward to working with you again in the future.

Sincerely, GHS Environmental Dana J. Gaydos Principal 3F1025-01 / Enclosure 5 / Page 44 of 83

for the CR3 Power Generating Facility at the Crystal River Energy Complex In Crystal River, FL Prepared for the DUKE Energy Florida 15760 West Power Line St.

Crystal River Unit 3 MAC NA2B Crystal River, FL 34428 CR3 Groundwater Flow Study Summary Report DUKE Energy Florida Prepared by:

GHS Environmental PO Box 55802 St. Petersburg, FL 33732 April 2017 3F1025-01 / Enclosure 5 / Page 45 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 i

Table of Contents Page Professional Certification ii 1.0 Executive Summary 1

1.1 Purpose 1

1.2 Objectives 2

2.0 Facility Background 3

2.1 Location 3

2.2 Site Geology and Hydrogeology 3

3.0 Groundwater Elevation Data Collection 8

3.1 Study Summary 8

3.2 Monitoring Locations 8

3.3 Monitoring Summary 8

3.4 Data Computation & Statistical Analysis 9

3.5 Model Assumptions 9

4.0 Results 12 4.1 General Summary 12 4.2 Groundwater Elevation Mapping & Contouring 12 5.0 Discussion 22 6.0 Conclusions 24 Figures Page Figure 1. Location Map 5

Figure 2. Site Map 6

Figure 3. Geology Map 7

Figure 4. Monitoring Locations 10 Figure 5. Site Wide Highest High Tide on 11/16/16 15 Figure 6. Site Wide Average Tide on 11/20/16 16 Figure 7. Site Wide Lowest Low Tide on 12/2/16 17 Figure 8. Plant Isthmus Highest High Tide on 11/16/16 18 Figure 9. Plant Isthmus Lowest Low Tide on 12/2/16 19 Figure 10. Change in Groundwater Elevation Within Tidal Range in Surficial Aquifer (Highest High Tide Minus Lowest Low Tide) 20 Figure 11. Change in Groundwater Elevation Within Tidal range in Floridan Aquifer 21 Tables Page Table 1. Monitoring Locations 11 Table 2. Groundwater Elevations in the Surficial and Floridan Aquifers.

14 Appendices Page Appendix A. Raw Data Files A1-A2 Appendix B. Groundwater Elevations Over Time B1-B5 Appendix C. Modeling Movie C1 Appendix D. Well Inspections.

D1-D2 3F1025-01 / Enclosure 5 / Page 46 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 ii Professional Certification In accordance with provisions in Chapter 492, Florida Statutes, I hereby certify that I have examined this Groundwater Flow Study Report and attest that it has been reviewed and approved by the undersigned Florida Professional Geologist.

GHS Environmental has prepared this report in a manner consistent with sound geologic practices and that level of care and skill ordinarily exercised by members of the profession currently practicing in the same locality under similar circumstances. Information provided to GHS Environmental by client representatives, agents, and other consultants has been accepted in good faith and is assumed to be accurate.

John M. Dumeyer, P.G.

Registered Professional Geologist Registration No. 038, State of Florida GHS Environmental, LLC Geology Business License GB787, State of Florida April 27, 2017.

Date 3F1025-01 / Enclosure 5 / Page 47 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 1

1.0 Executive Summary 1.1 Purpose DUKE Energy Florida (DUKE) requested that GHS Environmental (GHS) conduct a detailed groundwater flow study for the area surrounding Power Generation Unit 3 (CR3) at the Crystal River Energy Complex in Crystal River, Florida. The purpose of the study is to provide DUKE with an aerial map, set of maps or time lapse sequencing slide show documenting the pattern of groundwater flow beneath and around CR3. Previous reports prepared for DUKE include the Groundwater Monitoring Plan, Florida Power Corporation, Crystal River Energy Complex (Dames & Moore, April 1995), the Groundwater Flow Study Report, CR3 Power Generating Facility at the Crystal River Energy Complex in Crystal River, Florida (EnHydro, LLC, January 2007), and the Groundwater Flow Study Report, CR3 Power Generating Facility at the Crystal River Energy Complex in Crystal River, Florida (Gaydos Hydro Services, LLC, December 2012). The current groundwater flow study (the subject of this report) was conducted in order to provide an update to the previous study done in 2012 and to document any changes noted in the groundwater flow patterns across the site.

Specific concerns of interest in this updated groundwater flow study were to determine if the groundwater flow patterns across the site as a whole and the CR3 area in particular have been altered due to construction activities that have taken place at Crystal River Unit 3 for the construction of the Independent Spent Fuel Storage Installation (ISFSI).

This area was constructed to achieve a uniform zone of Cap Rock and improved limestone and to plug or grout any significant voids present immediately beneath the Cap Rock and the improved zone. The objective was to fill any largevoid zones to minimize the possibility of void collapse, sinkhole development, and/or ground subsidence and to reduce remaining smaller voids, cracks, and/or joints in the limestone Cap Rock in the differentially cemented limerock immediately underlying the Cap Rock.

This work was completed by GZA GeoEnvironmental, Inc.

The monitor wells used in the Groundwater Monitoring Plan (GWMP) by Dames &

Moore Incorporated were sited to monitor the applicable portions of the site and the Zone of Discharge (ZOD) for the Class G-II groundwater standards that are applicable to the Crystal River Energy Complex. The monitor wells are also located in the ZOD to ensure that G-III standards are met and that the groundwater is not toxic to surface water. Because the focus of the GWMP is on the Crystal River Energy Complex site as a whole, specifically on the coal/ash storage and evaporation/percolation facilities, in addition to the scattering of the eleven (11) GWMP monitor wells across the entire site; the GWMP does not specifically focus on the groundwater in the immediate vicinity of Unit CR3. Although the existing GWMP monitor wells were sited to be adequate for determination of background groundwater levels across the site, additional wells were installed around the CR3 complex during the EnHydro study in 2006 to more accurately document the direction of groundwater flow in the immediate vicinity of CR3.

The EnHydro study documented the installation of a network of groundwater monitoring wells around the perimeter of Unit CR3 that included ten (10) shallow monitoring wells (approximately 30 ft. deep) and three (3) deep monitoring wells (approximately 70 - 80 ft. deep). These wells (in addition to the GWMP wells) were used in a flow study to determine the pattern of direction and gradient of groundwater flow across the site and in the localized area around the perimeter of CR3. The study included a set of water level maps documenting groundwater flow directions at the peak and ebb of typical tidal 3F1025-01 / Enclosure 5 / Page 48 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 2

cycles and evaluated the potential vertical component due to mounding of groundwater flow due to subsurface impermeable barriers such as the grouting activities prior to the construction of Unit CR3.

Additional monitor wells have been constructed onsite to monitor the surficial flow of water in and around the various ash ponds. These wells have been named the CCRW wells. Several of the wells are in better locations around the site than the previously used TWI wells. These wells are generally 20 feet in total depth, and the screen intervals range from 1.88 ft. to -14.64 ft. the National Geodetic Vertical Datum (NGVD) of 1929.

The current study is to provide an updated version of the direction and gradient of groundwater flow across the site and in the localized area around the perimeter of CR3.

Groundwater elevation data was collected over the course of one full moon cycle from the following monitor well systems:

the seven (7) site-wide GWMP monitor wells, four (4) TWI wells (originally installed as Temporary Wells - Intermediate, hence the TWI designation) within the coal/ash storage and evaporation/percolation facilities, ten (10) shallow groundwater monitor wells around the perimeter of the CR3 site, three (3) deep groundwater monitor wells around the perimeter of the CR3 site, two (2) shallow groundwater monitor wells located on the western berm of the CR3 site, tidally-influenced intake (1) canals, and three (3) elevated percolation ponds located to the west of the CR3 Unit.

This report includes updated groundwater flow maps, a 2-D movie model showing the tidal influence localized around the CR3 unit, and an updated evaluation of the observed site-wide and localized groundwater elevations along with predicted flow directions interpreted from those elevations.

1.2 Objectives The primary objective of the Groundwater Flow Study was to generate sufficient data to characterize the groundwater flow site wide and within the vicinity of the CR3 facility.

Specific objectives included:

Collection of groundwater elevation data on a frequent enough interval and over a sufficiently long time period to conceptualize any fluctuations in the groundwater flow regime as a result of the influence of tidal cycles in the adjacent intake and discharge canals; Preparation of groundwater elevation contour maps with groundwater flow direction vectors depicting the groundwater flow regime in the study area; Preparation of a 2-D movie model depicting the tidal influence locally within the vicinity of the CR3 facility and site wide; and Evaluation of any anomalous patterns detected in the groundwater flow regime with respect to possible construction-related influences.

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DUKE Energy Florida CR3 Groundwater Flow Study April 2017 3

2.0 Facility Background 2.1 Location The Crystal River Energy Complex is located near the Gulf of Mexico in Citrus County, Florida (Figure 1). The facility encompasses approximately 4,750 acres and is situated in portions of Sections 28 through 36, Township 17 South, Range 16 East and in portions of Sections 3, 4, 5, 9, and 10, Township 18 South, Range 16 East. There are five power generating units at the Complex. Units 1, 2, 4, and 5 are coal-fired; Unit 3 (CR3) is closed nuclear reactor, having last run in 2009. Figure 2 identifies the various areas within the complex.

Units 1, 2, and 3 are located on the south side of the Complex. Associated impoundment areas include two ash storage ponds, an evaporation/percolation system, and a coal storage area with a runoff collection ditch.

Units 4 and 5 are located on the north side of the Complex. Associated impoundment areas include a coal storage area with an associated runoff collection ditch, and evaporation/percolation pond system, and an ash landfill with a runoff collection ditch.

2.2 Site Geology and Hydrogeology*

The western portion of the facility is located within the coastal swamps, which are part of the irregular shoreline. This area has been interpreted as relict, drowned karst topography, where insufficient sand is available to form beaches. The karst terrain was developed through the dissolution of the underlying limestone and dolomite resulting in numerous swamps, lakes, and shallow sinkholes. Surface drainage is poorly developed or absent. Thin sediments have accumulated upon the exposed Eocene limestone. The features may represent a young shoreline. The nearby offshore area is covered by a thin clastic sediment veneer and is characterized by a karst platform with limestone outcrops, sinks, and a few submarine springs.

Soils in and around the site are nearly level and poorly drained. In the eastern part of the site, the dominant soil association is the Broward-Boca association. This association consists of sandy soils underlain by limestone. To the west, these soils are nearly saturated and are classified as members of either the freshwater swamp or saltwater marsh association. The soils are subject to frequent and prolonged flooding.

The site geology is consistent with geology and hydrogeology of the coastal swamps with low marine terraces inland which have formed on a paleokarst peneplain. The Crystal River Shelf Embayment (coastal swamp area) is a sediment (sand) starved, low wave energy environment resulting in little to no sediment accumulation. The karst limestone surface in the vicinity of the percolation and ash ponds was originally bare to thinly covered with swamp-related muck soils, sand, and clayey sand in depressions (pockets) prior to the original site development in the late 1960s. Solution of the limestone is still occurring within both small scale and large scale features. A highly irregular array of small scale (centimeters to meters) pits, depressions, borings, etchings, and pinnacles are being altered by the acid marsh waters and root penetration. Small sinkholes or dolines are associated with the small scale karst actions. The larger scale karst features (tens to hundreds of meters) result from aggressive (undersaturated) groundwater being concentrated in rectilinear fractures, creating long linear depressions at the surface and underground channels and caverns.

Soil boring programs conducted in the past at various areas around the Complex have 3F1025-01 / Enclosure 5 / Page 50 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 4

indicated that voids, where encountered, are generally to be found within 50 ft. of the land surface. Studies have shown that the shallow portion of the Floridan Aquifer beneath the site consists of two primary zones in the Inglis Formation: 1) a zone from the surface to approximately 30 ft. below land surface (BLS), and 2) a zone extending from between 40 and 60 ft. BLS down to where the Inglis and Avon Park Formations interface. The upper zone contains many large interconnected solution cavities and channels that are highly permeable, whereas the solid, unfractured limestone in between the two zones has a much lower permeability. The lower zone (40 to 60 ft.

BLS) contains smaller voids and solution channels that are not as transmissive as those in the upper zone. There is a general upward flow gradient (discharge) in the Floridan Aquifer at the site.

Much of the background information on the site geology and hydrogeology is directly reproduced or interpreted from the Groundwater Monitoring Plan by Dames & Moore (April 1995).

Figure 3 provides a graphical representation of the local geology as described as outlined by the United States Geological Survey, variable sample interval from boring W7778. The land surface is identified as quaternary beach ridge or dunes to a maximum elevation of approximately 25 ft. NAD83 with Ocala Limestone extending to approximately 60 ft. below land surface (BLS) and Avon Park Formations beneath that the end of the boring at approximately 70.ft. BLS.

3F1025-01 / Enclosure 5 / Page 51 of 83

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3F1025-01 / Enclosure 5 / Page 52 of 83

6 s

Figure 2.

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7 s

Quaternary Beach Ridge and Dunes Quaternary Sediments ndifferentiated/Tertiary Quaternary Sediments Hawthorn Group, Undifferentiated Suwannee Limestone Ocala Limestone Avon Park Fonnation Figure 3.

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3 Date: 4/20/2017

~HS.LLC GHS Environmental, LLC PO Box 55802 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 54 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 8

3.0 Methodology 3.1 Study Summary This study replicates the methodology used in the EnHydro 2006 and GHS 2012 studies, which concluded that the groundwater elevation data collected from the monitoring wells displayed some degree of tidal fluctuation in groundwater elevations over the course of a tidal cycle because of the close proximity of the site to the tidally-influenced intake and discharge canals. In coastal areas affected by the action of tides, it is common to see such a fluctuation in groundwater levels within monitoring wells.

Due to this and several other factors it was decided to collect water levels in the wells for a minimum of one full moon cycle, which is significantly longer than the data collection period from the 2006 EnHydro study, in order to have a higher likelihood of capturing valid, easily interpreted groundwater elevation level data. Other factors pertinent to this decision include: 1) the tidal cycle along the Gulf of Mexico in Florida is mixed (both diurnal and semi-diurnal tides are experienced; in other words, some days have one high and one low tide, while other days have two high and two low tides); 2) tidal ranges vary in amplitude throughout the month from about one-half foot to nearly three feet; and 3) tidal response in groundwater monitoring wells tends to decrease in magnitude, and increase in lag time, as one moves further from the coast.

3.2 Monitoring Locations In order to adequately correlate the recorded groundwater elevations in the monitoring wells with actual tidal fluctuations, a baseline measuring point was established in the intake canals. Since the intake and discharge canals had almost replicate tidal changes in the 2012 study, the discharge canal monitoring point was discontinued to allow for data to be collected in an additional monitor well further inland. A drop pipe was secured to the guard railing along the actual pump intake at the eastern most end of the intake canal. In addition to this surface water data collection site, there are three percolation ponds to the west of CR3. These provide downward movement in this area. Data loggers were installed using drop pipes attached to the end of the dock. Proper measurements were taken to adjust the water elevations to the National Geodetic Vertical Datum of 1929 for comparison to the rest of the data set.

Groundwater elevation data was collected over the course of one full moon cycle from a total of thirty-three (33) data loggers from various monitoring locations over the entire Crystal River Energy Complex. The data loggers were installed in seven (7) site-wide GWMP monitor wells, four (4) TWI wells within the coal/ash storage and evaporation/percolation facilities, three (3) from the recently installed CCRW monitor wells, ten (10) shallow and three (3) deep groundwater monitor wells around the perimeter of the CR3 site, two (2) groundwater monitor wells on top of the CR3 berm, one (1) from the tidally-influenced intake canal, and from the three (3) elevated percolation ponds located to the west of the CR3 Unit. Figure 4 shows the locations of each of the monitoring locations.

3.3 Monitoring Summary All monitoring sites (Table 1) were equipped with an InSitu, Inc. Level Troll 700 water level datalogger. Water depths in feet below measuring point (ft. bmp) were measured with an electric water level tape immediately prior to installation of each datalogger. The dataloggers were set to record water levels hourly on the hour for the period of 3F1025-01 / Enclosure 5 / Page 55 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 9

November 15th, 2016 through December 14th, 2016. The dataloggers were downloaded weekly to check for proper function and remaining battery charge. Water depths were also measured and recorded at each check. Following the test period, the water levels were once again measured to verify that the data reference points had not drifted during the test.

3.4 Data Computation & Statistical Analysis The groundwater elevation data collected from each of the monitoring wells and the tidal elevation readings from the intake/discharge canals and ponds were input into Excel spreadsheets for graphing. All data collected is provided in Appendix A. Due to the lack of reference elevations for several monitoring locations, the collected data was post processed to reference National Geodetic Vertical Datum of 1929 (NGVD 1929).

The water elevation data was then mapped and contoured using the Inverse Distance Weighted (IDW) method of spatial interpolation in ArcView GIS mapping software.

ESRI's ArcGIS is capable of multiple types of interpolation depending on the density and distribution of the data points as well as the range of data values being interpolated.

Inverse Distance Weighted (IDW) is a method of interpolation that estimates cell values (as it creates a raster from the point data) by averaging the values of sample data points in the neighborhood of each processing cell. The closer a point is to the center of the cell being estimated, the more influence, or weight, it has in the averaging process. The raster interpolation surface that was created through IDW is then contoured, creating a vector polyline at the interval level desired by the user.

3.5 Model Assumptions GHS applied several assumptions to the groundwater model in order to control known factors where data sets were either missing or clearly portrayed man-made influence to the data. These include the following.

1. One data logger was installed in the Intake Canal since previous reports show little to no significant changes in tide between the two canals. The data from the Intake Canal was applied to multiple points along the banks of both the Intake Canal and Discharge Canal.

2. The data from the Intake Canal was not applied to areas to the west of the site along the Gulf of Mexico.

3. One data logger was installed in three (3) percolation ponds located to the west of the CR3 plant. The data was applied to multiple points around the bank of the pond of each pond instead of at a single point within the pond.

4. Pond A, located to the west of the CR3 plant, portrayed industrial use manipulations over the monitoring time period. Because of the unnatural, man-made interruptions within the data set, it was not included in the model.

5. The dataloggers in CR3-11 and CR3-13 showed a muted tidal or lunar fluctuation due to the heavy use of concrete to contain the nuclear plant. These data sets are considered not related to the overall site or plant isthmus groundwater flow and are not included in the model.

6. The concrete curtain wall surrounding the CR3 plant was set at an arbitrary elevation of 3.75 NGVD. This assumption is supported by the lack of relation in groundwater elevation between the ten CR3 surficial groundwater monitoring wells located outside of the curtain wall and CR3-11 and CR3-13 located inside the curtain wall.

3F1025-01 / Enclosure 5 / Page 56 of 83

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Zoom to CR3 Area Feet 0 250500 1,000 1,500 Date: 4/20/2017 GHs,,c GHS Environmental, LLC PO Box 55802 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 57 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 11 Table 1. Monitoring Locations.

3F1025-01 / Enclosure 5 / Page 58 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 12 4.0 Results 4.1 General Summary The overall general groundwater flow direction is to the southwest in both the Surficial aquifer and the Floridan Aquifer. There is a slight groundwater elevation difference between the surficial and Floridan Aquifers with an average elevation difference of approximately 1.5 ft. NGVD.

All of the data sets collected from the wells in the CR3 area and monitor wells adjacent to the canals exhibit expected patterns of groundwater elevation fluctuation. The percolation ponds located on the plant isthmus create a down welling effect, which influences MWC-27, which is located between the ponds and the discharge canal. Wells TWI-1R, TWI-2R, TWI-3, TWI-4, TWI-5, MW-7R, and MW-21R exhibited minor fluctuations in groundwater elevation; this is to be expected, as these wells are the furthest from the tidal influence of the intake and discharge canals. Table 2 presents a summary of the groundwater elevation data.

It should be noted that due to the lag time involved in the landward extension of tidal influences, some of these interior/landward wells occasionally exhibit highs and lows that do not directly correlate to high-tide and low-tide maxima and minima. These fluctuations represent a lunar driven tide on the groundwater. However, due to the relatively low groundwater gradient across the site, this situation does not alter the conclusions reached in this report.

4.2 Groundwater Elevation Mapping & Contouring Each of the groundwater elevation datasets exhibited a sinuous curve when graphed.

Appendix B shows various combinations of monitor wells. Because of the dampening effect of the passage of the tidal pressure curve through the rock and soils of the aquifer, the response of the wells to tidal changes is not instantaneous. This results in a lag time in the elevation fluctuations within the wells with respect to the tidal changes in the intake/discharge canals. Additionally, tidal ranges (amplitude) vary throughout the monthly tidal cycle. The time period of record started on November 15th, 2016 and continued through December 14th, 2016. The observed tidal range was from approximately -2.90 ft NGVD29 to +3.54 ft NGVD29 in the intake canal.

To investigate whether the groundwater flow direction changes throughout the changing tidal cycle, whether the deep zone of the aquifer exhibits different flow patterns than the shallow zone and whether the observed groundwater flow patterns in the vicinity of the CR3 Facility are consistent with the groundwater flow patterns across the entire Crystal River Energy Complex, multiple groundwater elevation maps were prepared for comparison. The highest high, average and lowest low of groundwater elevation contour maps were prepared for each of the following sets of wells: 1) Background site conditions - all of the shallow monitoring wells across the Complex other than the Plant Isthmus wells (wells near CR3 and the Ponds); 2) the shallow monitoring wells on the Plant Isthmus (those in the vicinity of the CR3 Facility and the Ponds). Additionally, a comparison of water levels in the shallow and deep wells in the immediate vicinity of the CR3 area to show areas of highest change in groundwater elevation due to the tidal influence.

The groundwater elevation data was imported into ArcView GIS mapping software and contoured using the Inverse Distance Weighted (IDW) method of spatial interpolation.

3F1025-01 / Enclosure 5 / Page 59 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 13 These contours were then overlaid on the base site maps and annotated with arrows depicting the approximate direction of groundwater flow. These maps are presented as Figure 5, Figure 6 and Figure 7 and show the site-wide highest high, average and lowest low surficial groundwater elevations. Figure 8 and Figure 9 show the Plant Isthmus area highest high and lowest low surficial groundwater elevations. Figure 10 and Figure 11 show the difference between the highest high and lowest low water levels in the surficial aquifer versus deep Floridan wells in the CR3 area.

Following a detailed examination of the data set both in tabular and graphic formats, the highest high water level for the surficial aquifer was on November 16, 2016 at 2 a.m.

(11/16/16 @ 2:00), and the lowest low water level for the surficial aquifer was on December 2, 2016 at 10 a.m. (12/2/16 @ 10:00). These two scenarios were chosen to be plotted on aerial maps of the Crystal River Energy Complex. The objective was to depict the greatest and least groundwater flow gradients across the site in order to better understand the possible range of fluctuations in the groundwater flow patterns.

Site-wide maps were used to depict the general pattern of groundwater flow across the site. During high-tide conditions (Figure 5), there is close to a 5-foot groundwater gradient across the entire site. During an average tide as shown in Figure 6, the gradient is approximately 6 feet across the site. This gradient increases to a maximum of approximately 9.5-feet across this site from the canals to the furthest east monitor well during low-tide conditions (Figure 7).

For the deeper Floridan groundwater wells, the lowest low water level was on November 28, 2016 at 11 a.m. (11/28/16 @ 11:00) and the highest high was on December 14, 2016 at 12 p.m. (12/14/16 @ 12:00). The Floridan groundwater elevation changes the greatest in CR3-6D, located almost in the center of the isthmus, then either CR3-1D or CR3-3D, which are located east of the CR3 facility.

Of particular interest is the apparent limit of tidal influence - the northeast quadrant of the Crystal River Energy Complex appears to be relatively unaffected by tidal influence, whereas the west and southwest quadrants exhibit groundwater elevation fluctuations that are more tidally-influenced as the intake/discharge canals and the Gulf coastline are approached. Various graphs depicting groundwater elevation change over time are included in Appendix B.

A two-dimensional slide show (movie) was also prepared depicting the variations in groundwater elevations in the area of the plant isthmus including the CR3 Unit and the percolation ponds, as this is the area that is the focus of this investigation. This Modeling Movie is included in electronic format in Appendix C.

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DUKE Energy Florida CR3 Groundwater Flow Study April 2017 14 Table 2. Groundwater Elevations in the Surficial and Floridan Aquifers.

3F1025-01 / Enclosure 5 / Page 61 of 83

15

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Feet 0 250500 1,000 1,500 Date: 4/23/2017

~s. LLC GHS Environmental, LLC PO Box 55802 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 62 of 83

16

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s. LLC GHS Environmental, LLC PO Box 55802 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 63 of 83

17 Figure 7. Site-Wide Lowest LowTide 12-2-2016 Monitoring Sites D

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1,000 1,500 Date: 4/23/2017 GHs.LLC GHS Environmental, LLC PO Box 55802 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 64 of 83

18

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0 Feet 75 150 300 Date: 4/23/2017 GHs.LLC GHS Environmental, LLC PO Box 55802 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 65 of 83

19 CR3-1D

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~s.LLC GHS Environmental, LLC PO Box 55802 300 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 66 of 83

20

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Figure 10. Change in Groundwater Elevation Within Tidal Range in Surficial Aquifer (Highest High Tide Minus Lowest Low Tide)

Monitoring Sites Change In Groundwater D ccRw Shallow Wells CONTOUR 6

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Feet 0

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21 CR3-3D CR3-1 D Figure 11. Change in Groundwater Elevation Within Tidal Range in Floridan Aquifer L,,

Deep Wells Change In Groundwater Deep Wells

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Feet 0

75 150 300 Date: 4/23/2017 GHs,"

GHS Environmental, LLC PO Box 55802 St. Petersburg, FL 33732-5582 Phone: 727-667-6786 dana@ghsenvironmental.com www.ghsenvironmental.com 3F1025-01 / Enclosure 5 / Page 68 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 22 5.0 Discussion The shallow groundwater gradients across the Complex and in the immediate vicinity of the CR3 Facility are fairly consistent with the expected patterns, as are the deep groundwater gradients beneath the CR3 Facility. As seen in previous reports and seen again in this study, surficial groundwater flow is generally from the east-northeast to the west-southwest, with obvious discharge towards the intake and discharge canals. This is seen Figures 5 through Figure 7. The shallow groundwater levels at the locations of distant monitoring wells (MW-7, MW-21R, TWI-1R, TWI-2R, TWI-3, TWI-4, CCRW-2, and CCRW-7) exhibit minimal fluctuation between high and low tidal stages. The groundwater elevations in the vicinity of the CR3 Facility, however, exhibit as much as two to three feet of fluctuation. This situation indicates that the groundwater gradient is not static; rather, the gradient is steepest at low tide conditions (Figure 7) and flattest at high tide (Figure 5).

The extent of the tidal influence on the surficial aquifer lies east of the CR3 area during high tide. As seen in Figure 8, the surficial groundwater elevations rise in association with the canals inland, past the CR3 Facility. During low tide as seen in Figure 9, the interface falls back towards the canals during low tide. Figure 10 shows the change in groundwater elevation between high and low tides. The tidal influence generally does not extend past the eastern coal conveyor belt that runs north-south to the northeastern coal storage area.

The deep wells in the CR3 area exhibit similar westward groundwater flow patterns as in the shallow zone of the aquifer. As only three wells were available for interpretation, contour lines and flow patterns for the deeper wells were not plotted. Instead, Figure 11 shows the change in groundwater elevations around the CR3 area between the highest high and lowest low conditions. As seen in the surficial aquifer, the isthmus has the highest tidal influence in the Floridan Aquifer.

The conclusion from this study was that there is a downward gradient. The vertical head differences observed range between a quarter (0.25) of a foot to one and a half (1.5) feet, reflecting the degree of hydraulic connection between the shallower and deeper zones of the aquifer in this area. However, variability in factors such as rainfall and tidal ranges could easily account for the apparent differences in vertical groundwater flow gradients over time. The potential effects of the grouting beneath the CR3 area does not appear to affect the overall site-wide groundwater flow patterns. The minor variation in groundwater elevations that are observed in the shallow versus the deep wells in this area are greatly overshadowed by the larger variability in the site-wide groundwater flow gradient that results from the effect of a three-to four-foot tidal range in the intake/discharge canals.

In the immediate vicinity of the CR3 Unit, groundwater flow directions appear to be relatively constant, varying primarily in the degree or slope of the tidal gradient. As expected, groundwater flow appears to be generally towards the intake and discharge canals, with any westward groundwater flow from the east side of CR3 being diverted north and south around the CR3 berm and towards the canals. The percolation ponds west of CR3 on the Plant Isthmus exhibit an expected radial pattern of groundwater flow outwards from the ponds towards the canals.

3F1025-01 / Enclosure 5 / Page 69 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 23 In general, groundwater flowing from areas to the east of the CR3 Unit diverts around the CR3 area and discharges to the intake and discharge canals. This is likely due to a combination of two driving factors: 1) the canals are the lowest water elevations on the site, thus they are the controlling factor for the ultimate destination of groundwater flow discharging to the west; and 2) the extensive grouting and foundation work that was done in the CR3 area as part of the construction of the CR3 Unit causing the groundwater to be diverted around this area. Information that we have received from DUKE Energy includes the following engineering summary of the effects of the foundation grouting work:

The original construction of the plant revealed that the CR3 foundation system consists of an excavated area which has been backfilled with groutable material, drilled indiscriminately across the site into bedrock and pressure grouted within a curtain wall. This initial subsurface layer is capped with a combination of 1500 psi concrete backfill (primarily under and around building foundations), structural concrete and densely compacted limerock. The total plant area is surrounded by a Curtain Wall which extends from an average depth of -5 feet to approximately 91 to 93. The curtain wall acts as a water resistant seal around the grouted area. The purpose of this curtain was to aid in grouting activities during construction by preventing the grout, water and related materials from escaping the plant area under pressure.

The final operation performed on the curtain wall was waterproofing, which involved injecting a neat cement and water mixture into the wall, which created a nearly impermeable wall around the perimeter of the Power Plant. Compacted limerock was placed between and around the structures on site and crushed, friable, limestone material makes up the finished grade of the plant area.

As previously stated, the groundwater is confined by the bottom layer of 1500 psi concrete backfill and a fully grouted course aggregate and also by a monolithic section of earth that has been subjected to extensive consolidation grouting.

Starting at an elevation of -5 feet and extending to approximately +91 to 93 feet, the groundwater is confined laterally by a curtain wall that was installed to control pressurized materials and water during consolidation grouting but remains in-situ as a permanent barrier to groundwater inflow-outflow.

The overall result of this foundation arrangement is a subsurface which is resistant to groundwater discharge. Water storage areas exist inside the curtain walls, along structural walls, above concrete backfill, within limerock layers, along structural wall seams, within subdrainage zones, within block form walls and to a limited extent within fissures and porous features of concrete backfill blockout. It is not possible to calculate the exact level of storage available at any given time and it is unrealistic to assume that the entire area is a potential water storage area. - (From DUKE Condition Report #448181) 3F1025-01 / Enclosure 5 / Page 70 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 24 6.0 Conclusions The primary objective of the Groundwater Flow Study was to generate sufficient data to characterize the groundwater flow in the vicinity of the CR3 Facility. Specific objectives included:

Identification of a sufficient number of groundwater monitoring wells to adequately characterize the groundwater flow regime in the vicinity of CR3; Collection of groundwater elevation data on a frequent enough interval and over a sufficiently long time period to conceptualize any fluctuations in the groundwater flow regime as a result of the influence of tidal cycles in the adjacent intake and discharge canals; and Preparation of groundwater elevation contour maps with groundwater flow direction vectors depicting the groundwater flow regime in the study area.

The groundwater elevation data collected from the existing monitoring wells was sufficient for the preparation of the required groundwater elevation contour maps. As found in previous studies, groundwater flows originating in the eastern half of the Crystal River Energy Complex are generally towards the west-southwest, with the primary receiving water bodies being the intake/discharge canals and the marsh/wetlands proximal to the Gulf of Mexico coastline. Compared to the results of the previous groundwater flow study, the groundwater flow directions across the entire site in general and specifically around the CR3 area do not appear to have been measurably altered. Localized groundwater flow directions beneath and around the CR3 Facility are generally to the west-southwest in both the shallow and deep zones of the aquifer, but are vectored towards the canals in the surficial aquifer due to the effect of the unlimited hydraulic conductivity of these open water bodies cutting into the aquifer.

Groundwater flows radially outward away from the percolation ponds to the west on the Plant Isthmus but are also preferentially vectored towards the adjacent canals. Pond-area groundwater flows do not appear to significantly affect or interact with groundwater flows from the CR3 area.

As seen in previous reports, the short lag time between high and low tide levels and the high and low water elevation levels in the CR3 area wells (less than two hours) indicates that the hydraulic conductivity of the aquifer is relatively high, possibly on the order of 1000 ft/day as indicated by earlier well testing in the area. This is ameliorated by the relatively low (< 3 ft) groundwater gradient in the area, which provides a low driving force on the groundwater flow. Groundwater tracer tests in the vicinity of the CR3 Facility, however, would be the only way to obtain empirical measurements of the actual groundwater flow velocity in the study area.

Monitoring wells CR3-5, CR3-6S, CR3-6D, CR3-7, CR3-8, and CR3-9 along with samples from the intake canal are appropriate for long-term monitoring to detect the presence of any release from the CR3 Unit of water containing elevated levels of radioactive isotopes. These wells are currently sampled quarterly which is adequate given the shutdown status of CR3 and the fact that most plant systems containing contaminated water have been drained. However, should an unexpected increase in radioactivity be detected, the monitoring frequency should be re-evaluated and, if necessary, increased.

3F1025-01 / Enclosure 5 / Page 71 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 25 All of the upgradient wells (CR3-1S, CR3-1D, CR3-3S, CR3-3D, CR3-2R, CR3-4 and CR3-10) are currently being monitored on a quarterly basis for the purpose of background comparison. GHS recommends that this practice is continued.

3F1025-01 / Enclosure 5 / Page 72 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 A1 Appendix A Raw Data Sets To download these files, double click the icon.

3F1025-01 / Enclosure 5 / Page 73 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 A2 Intake CR3-1S CR3-1D CR3-2 CR3-3S CR3-3D CR3-4 CR3-5 CR3-6S CR3-6D CR3-7 CR3-8 CR3-9 CR3-10 CR3-11 CR3-13 MWC-1 MWC-7R MWC-16 MWC-21R MWC-27 MWC-29 MWC_IF2 TWI-1R TWI-2R TWI-3 TWI-4 CCRW-2 CCRW-3 CCRW-7 Pond A Pond B Pond C 3F1025-01 / Enclosure 5 / Page 74 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 B1 Appendix B Groundwater Elevations Over Time 3F1025-01 / Enclosure 5 / Page 75 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 B2 3F1025-01 / Enclosure 5 / Page 76 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 B3 3F1025-01 / Enclosure 5 / Page 77 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 B4 3F1025-01 / Enclosure 5 / Page 78 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 B5 3F1025-01 / Enclosure 5 / Page 79 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 C1 Appendix C Model Movie GW Movement on the Highest High 3F1025-01 / Enclosure 5 / Page 80 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 D1 Appendix D Well Inspections 3F1025-01 / Enclosure 5 / Page 81 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 D2 All groundwater monitoring wells were inspected for access and landscape maintenance to and around the well, condition of well casing and well pads, functional well caps and vaults on flush mount wells, and identification. Overall, the majority of the wells were in good condition.

All monitoring wells had easy access, and the landscape had been recently maintained.

There are a few wells, specifically MW-7, MWC-21R and MWC-29, that had some vegetative overgrowth since these wells are located along fence lines, within storage areas or in areas that is not frequently visited.

One well, CR3-3D, has a damaged well casing. The 2-inch diameter stick up within the flush mount vault is broken almost down to the concrete. The well cap does not seal.

Water was found within the vault on at least two of the site visits. This well needs to be repaired and surveyed.

CR3-3D: Broken Casing.

Several wells, CR3-3D, CR3-5, CR3-8, MWC-16, MWC-27 and MWC-27, need the well caps replaced. The well caps at CR3-5, CR3-8 would not tighten or loosen but would make a seal. The well caps at CR3-3D, MWC-16 and MWC-IF2 do not seal the well, which is a flush mount, and allows any stormwater or surface water to flow into the well vault, possibly directly into the aquifer. Each of these wells also were found with water in the vault. The well cap at MWC-27 will pull off with little effort. This well is enclosed and locked.

Several monitor wells were either not labeled, the well tag was missing or the concrete pad was not stamped clearly. These include CR3-11, CR3-12, CR3-13, MW-7R, MWC-16, MWC-21R, MWC-27 and CCRW-2.

The following table summarizes the maintenance needs of these monitoring wells.

3F1025-01 / Enclosure 5 / Page 82 of 83

DUKE Energy Florida CR3 Groundwater Flow Study April 2017 D3 Location Area CR3 MW's MW Name Q) s 2

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3F1025-01 / Enclosure 5 / Page 83 of 83

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Dear Mr. Burtoff,

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