ML20259A179

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

ML20259A179
Person / Time
Site:	Westinghouse
Issue date:	07/30/2020
From:	Jeffery Grant, Suddeth C AECOM
To:	Office of Nuclear Material Safety and Safeguards
Diaz-Toro D
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Download: ML20259A179 (145)

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Consent Agreement #19-02-HW 5801 Bluff Road Hopkins, South Carolina 29061 February 2020 (revised July 2020)

Final Interim RemediaI Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Quality information Prepared by Verified by Jeremy Grant, P.G. Chuck Suddeth, P.G.

Sr. Project Manager Sr. Project Manager Prepared by:

AECOM 101 Research Drive Columbia, SC 29203 aecom.com Copyright © 2020 by AECOM All rights reserved. No part of this copyrighted work may be reproduced, distributed, or transmitted in any form or by any means without the prior written permission of AECOM.

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Final Interim RemediaI Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Table of Contents Executive Summary ....................................................................................................................................................... v

1. Introduction ............................................................................................................................................................. 1

2. General Site Geology and Hydrogeology ................................................................................................................ 3

3. Groundwater Data Summary .................................................................................................................................. 4 3.1 Floodplain Vertical Groundwater Profiling .................................................................................................... 4 3.2 Chlorinated Volatile Organic Compounds ..................................................................................................... 5 3.3 Nitrate........................................................................................................................................................... 5 3.4 Fluoride ........................................................................................................................................................ 5 3.5 Technetium-99 and Gross Beta .................................................................................................................... 6 3.6 Uranium........................................................................................................................................................ 6 3.7 Private Water Supply Well Sampling ............................................................................................................ 7 3.8 Non-Constituents of Potential Concern ........................................................................................................ 7

4. Surface Water Data Summary ................................................................................................................................ 8 4.1 Chlorinated Volatile Organic Compounds ..................................................................................................... 8 4.2 Nitrate........................................................................................................................................................... 8 4.3 Fluoride ........................................................................................................................................................ 8 4.4 Technetium-99 .............................................................................................................................................. 8 4.5 Uranium........................................................................................................................................................ 8 4.6 Non-Constituents of Potential Concern ........................................................................................................ 8

5. Sediment Data Summary ........................................................................................................................................ 9 5.1 Chlorinated Volatile Organic Compounds ..................................................................................................... 9 5.2 Nitrate........................................................................................................................................................... 9 5.3 Fluoride ........................................................................................................................................................ 9 5.4 Technetium 99 .............................................................................................................................................. 9 5.5 Uranium...................................................................................................................................................... 10 5.6 Non-Constituents of Potential Concern ...................................................................................................... 10

6. Technetium-99 Soil Data Summary....................................................................................................................... 11

7. Hydraulic Characteristics of the Floodplain ........................................................................................................... 12

8. Conceptual Site Model .......................................................................................................................................... 13

9. Private Water Supply Well Survey ........................................................................................................................ 14

10. Variances from the Remedial Investigation Work Plan.......................................................................................... 15

11. Conclusions and Recommendations ..................................................................................................................... 16 11.1 Conclusions ................................................................................................................................................ 16 11.2 Recommendations ..................................................................................................................................... 16

12. References............................................................................................................................................................ 17 AECOM ii

Final Interim RemediaI Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Tables Table 1 Summary of Well Construction Details and Groundwater Elevations Table 2 Summary of Floodplain Vertical Groundwater Profiling Analytical Results Table 3 Summary of October 2019 Groundwater Analytical Results Table 4 Summary of Surface Water Analytical Results Table 5 Summary of Sediment Analytical Results Table 6 Summary of Soil Technetium-99 Analytical Results Table 7 Summary of Hydraulic Characteristic Results Table 8 Summary of Private Water Supply Well Survey Results Figures Figure 1 Site Location Map Figure 2 Site Map Figure 3 Potentiometric Map - Upper Surficial/Upper Floodplain Aquifers Figure 4 Potentiometric Map - Black Mingo Aquifer Figure 5 Lithologic Boring Locations Figure 6 Extent of PCE - Upper Aquifers Figure 7 Extent of PCE - Lower Aquifers Figure 8 Extent of TCE - Upper Aquifers Figure 9 Extent of TCE - Lower Aquifers Figure 10 Extent of Nitrate in Groundwater Figure 11 Extent of Fluoride in Groundwater Figure 12 Extent of Technetium-99 in Groundwater Figure 13 Extent of Uranium in Groundwater Figure 14 Private Water Supply Well Locations Figure 15 Surface Water Sample Locations Figure 16 Sediment Sample Locations Figure 17 Technetium-99 Soil Sample Locations Appendices Appendix A Laboratory Analytical Data Tables Appendix B Leidos Technical Basis Document Appendix C Hydraulic Characterization Results Appendix D Conceptual Site Model Appendix E Laboratory Analytical Data (on a Compact Disc [CD])

Appendix F Additional Figures AECOM iii

Final Interim RemediaI Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility List of Acronyms AECOM AECOM Technical Services, Inc.

AOC Area of Concern BLS below land surface CA Consent Agreement CD compact disk CFFF Columbia Fuel Fabrication Facility COPC constituent(s) of potential concern CSM Conceptual Site Model CVOCs chlorinated volatile organic compounds DCE 1,1-Dicholorethene DHEC South Carolina Department of Health and Environmental Control DNR South Carolina Department of Natural Resources ft/day feet per day IUSL Industrial Use Screening Level MCL maximum contaminant level MDC Minimum Detectible Concentration MEK methyl ethyl ketone mg/kg milligrams per kilogram mg/L milligrams per liter mrem/yr millirem per year NCRP National Council on Radiation Protection and Measurements NIH National Institute of Health NPDES National Pollution Discharge Elimination System NRC Nuclear Regulatory Commission PCE tetrachloroethene pCi/g picocuries per gram pCi/L picocuries per liter PVC polyvinyl chloride QA/QC quality assurance/quality control RI remedial investigation RUSL Residential Use Screening Level SC South Carolina SOF Sum of Fractions TAL target analyte list Tc-99 Technetium-99 TCE trichloroethene TCL target compound list U uranium

µg/L micrograms per liter Westinghouse Westinghouse Electric Company, LLC WWTP wastewater treatment plant yr year AECOM iv

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Executive Summary The Westinghouse Electric Company, LLC (Westinghouse) Columbia Fuel Fabrication Facility (CFFF) includes approximately 1,151 acres, with the developed area encompassing approximately 75 acres. The Congaree River is approximately 3 miles from the plant. CFFF manufactures fuel assemblies and components for the commercial nuclear power industry. Prior environmental assessment activities identified the following constituents of potential concern (COPCs) at the site: chlorinated volatile organic compounds (CVOCs), nitrate, fluoride, technetium-99 (Tc-

99) and uranium (U). The data generated by previous assessment activities and the additional assessment data presented in the report show that no COPCs have migrated off-site, and the extent of existing COPCs are limited and generally well defined, posing no potentially significant threat to plant workers, the general public or the environment.

The South Carolina Department of Health and Environmental Control (DHEC) and CFFF entered into a Consent Agreement (CA) to comprehensively assess potential environmental impacts from current and historical operations, including additional assessment of known impacts. Phase I of the comprehensive Remedial Investigation (RI) has been conducted as part of the CA to: 1) further assess the extent of previously identified groundwater impacts; 2) assess areas of the plant operations that had not been previously evaluated; 3) assess potential surface water impacts; 4) assess potential sediment impacts; 5) assess potential sources of Tc-99 soil impacts; 6) assess the depths of surface water bodies; and 7) evaluate private water supply wells. The RI field work included the following additional assessment activities:

Survey of private water wells near the facility and analysis of groundwater samples from four private wells; Installation of 19 lithologic borings; Submission of an Additional Floodplain Assessment Plan in August 2019 and a Sediment Transect Sampling Plan in October 2019; Analysis of 21 groundwater samples collected from temporary groundwater screening locations; Installation, development, and surveying of 29 permanent monitoring wells; Collection and analysis of 89 groundwater samples (including the 29 new wells, one new well [W-91] did not have enough groundwater to collect a representative sample in October 2019) from the monitoring well network; Collection and analysis of 12 surface water samples; Collection and analysis of 63 sediment samples; Collection and analysis of 56 soil samples; Bathymetric surveys of the Gator Pond, Upper Sunset Lake and Lower Sunset Lake; Installation of four surface water staff gauges; and Slug tests in four newly installed floodplain wells.

The following conclusions can be drawn from this newly acquired data:

Groundwater, surface water and sediment data indicate that there are no COPCs migrating off the site.

No source of Tc-99 was identified in soil.

Analysis of groundwater samples from four private water supply wells identified no COPCs related to CFFF manufacturing operations. The closest private water supply well is over 1 mile downgradient of the known areas impacted by of COPCs. The private water supply well survey findings reinforce that there is no potential for COPCs from CFFF to impact private water supply wells.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility The documented impact poses no potentially significant threat to plant workers, the general public or the environment.

In general, the vertical and horizontal extent of COPCs has been further defined and shows that the groundwater plume sizes and locations are similar to previously identified areas of impact. Analysis of groundwater samples collected from the newly installed monitoring network around the primary manufacturing area identified one additional well with U above the MCL. The impact of U is well defined and limited to a small area immediately adjacent to the plant building.

Conditions within the floodplain are conducive to natural degradation and attenuation of the CVOC plume which will limit the plumes size.

Sediment impacted by COPCs is limited and well defined horizontally.

An improved understanding of site geology and hydrogeology has been developed, particularly with respect to the floodplain and how shallow groundwater interacts with surface water and sediment. The Conceptual Site Model (CSM) has been enhanced by the newly acquired data, making it a more effective decision-making tool.

Limited data gaps remain in specific areas and environmental media. CFFF recommends the following:

Conduct additional assessment as necessary to fill the identified data gaps. A Phase II RI Work Plan documenting the scope of work for Phase II assessment will be submitted to DHEC for review and input.

Complete the additional Tc-99 source investigation work plan approved by DHEC on February 13, 2020, to further evaluate potential Tc-99 source areas since none have yet been identified.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

1. Introduction Westinghouse Electric Company, LLC (Westinghouse) Columbia Fuel Fabrication Facility (CFFF) is located at 5801 Bluff Road (site or property) in Hopkins, South Carolina (SC; Figure 1). The site includes approximately 1,151 acres, with the developed area encompassing approximately 75 acres, thereby creating substantial buffers from downgradient adjoining properties. CFFF manufactures fuel assemblies and components for the commercial nuclear power industry. Site features and monitoring well locations are displayed on Figure 2.

The South Carolina Department of Health and Environmental Control (DHEC) and CFFF entered into a Consent Agreement (CA) 19-02-HW on February 26, 2019, to comprehensively assess all potential environmental impacts from current and historical operations, including additional assessment of known impacts. The CA requires further assessment and potential remediation of known constituents of potential concern (COPC) and assessment of additional areas where releases may have occurred. CFFF submitted a Remedial Investigation (RI) Work Plan dated April 2019 to DHEC (CFFF, 2019A). On May 24, 2019, DHEC provided comments to the April 2019 RI Work Plan.

CFFF submitted a Final Remedial Investigation Work Plan to DHEC in June 2019 (CFFF, 2019B). DHEC approved the Final RI Work Plan on June 19, 2019.

Work outlined in the Final RI Work Plan represents the first step in an iterative process to fulfill the requirements of the CA. Data presented in this report includes the results of assessment activities conducted from June 2019 through January 2020.

Activities performed during this time period include:

Completion of 19 lithologic borings in the floodplain to acquire data necessary to better characterize the geology of the floodplain sediments and their relationship to the lithologic units underling the developed portion of the site; Submission of an Additional Floodplain Assessment Plan in August 2019 (CFFF, 2019C) and a Sediment Transect Sampling Plan in October 2019 (CFFF, 2019D) to better understand the connectivity and potential migration of COPCs from the sands of the surficial aquifer to sands of the floodplain aquifer and to further assess COPC impact in initial, limited sediment data collected from Upper and Lower Sunset Lakes; Analysis of 21 groundwater samples collected from discrete screened intervals within temporary wells installed in seven lithologic borings to better understand COPC transport in the floodplain aquifer; Installation, development, and surveying of 29 permanent monitoring wells (W-69 through W-97) to further delineate the extent of groundwater COPC impact; Collection and analysis of groundwater samples from 89 wells (including the 29 new wells) in the monitoring well network to provide a contemporaneous, site-wide dataset to evaluate the extent of groundwater impact; Collection and analysis of four groundwater samples from private water supply wells located generally downgradient from the site to assess whether documented COPC impact within groundwater at the site had impacted these water supply wells; Collection and analysis of 12 surface water samples in various surface water bodies to assess potential impact to surface water by COPC impacted groundwater discharges; Collection and analysis of 59 sediment samples to assess sediment in various surface water bodies for potential COPC impact; Collection and analysis of four sludge samples to assess sediment in two on-site WWTP lagoons for potential COPC impact; Collection and analysis of 56 soil samples to assess potential Technetium-99 (Tc-99) source areas; Installation of four staff gauges in various surface water bodies to measure surface water elevations so that the relationship between groundwater and surface water can be better understood; Bathymetric survey of the Gator Pond, Upper Sunset Lake and Lower Sunset Lake to assess their total depths; and AECOM 1

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Slug tests in the four newly installed floodplain wells (W-94 through W-97) to assess the hydraulic conductivity in the floodplain aquifer.

This Final Interim Remedial Investigation Data Summary Report is intended to document the RI assessment activities to date. An RI Report will be submitted after future phases of the RI work are completed and will be a compendium of assessment activities.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

2. General Site Geology and Hydrogeology The developed portion of the site occupies about 75 acres of the 1,151 acre site and lies on a river terrace deposit of the Congaree River. Site soils are generally characterized by several feet of surficial silt or clay above coarsening downward sands. In some areas of the developed portion of the site, there are silt or clay lenses interspersed within the sand layer. Below the sand lies a dense clay layer (Black Mingo Aquifer confining unit) that extends under the entire site. Based upon data collected during this and previous assessments, the Black Mingo Aquifer confining clay layer ranges in thickness from 39 feet (W-3A and W-71) to 89 feet (W-50). A structure map of the top of the Black Mingo confining clay is included in Appendix F as Figure A.

As documented in the June 2019 Final RI Work Plan (CFFF, 2019B), the unconfined, water table aquifer beneath the developed portion of the site is defined as the surficial aquifer and has been divided into two zones based upon proximity to the confining clay. The upper surficial aquifer is the shallower zone of the surficial aquifer, and the lower surficial aquifer is the deeper zone of the surficial aquifer on or within five feet of the Black Mingo confining clay.

The Congaree River floodplain occupies the southern portion of the site. An approximately 30-foot bluff separates the developed portion of the site from the Congaree River floodplain. The depositional environment of the floodplain sediment is similar to the sediment deposits of the developed portion of the site, consistent with both sets of deposits having been created by the Congaree River. Like the developed portion of the site, several feet of surficial silt overlie coarsening downward sands with alternating silt and sands above the Black Mingo confining clay. Shallow groundwater in the floodplain is designated as the floodplain aquifer.

Below the Black Mingo confining clay is the confined Black Mingo Aquifer. According to information on the South Carolina Department of Natural Resources (DNR) Geologic Survey Fort Jackson South Geologic Quadrangle map, sediment within the Black Mingo aquifer consists of poorly sorted, angular to rounded, cohesive matrix of clayey, silty, micaceous, fine to very coarse-grained, smoky and white quartz sand (DNR, 2011).

Groundwater flow within the unconfined surficial aquifer is generally to the southwest with components of flow to the west and south. Groundwater flow within the Black Mingo Aquifer is generally to the southwest. Potentiometric maps of the surficial aquifer and Black Mingo Aquifer are included as Figure 3 and Figure 4, respectively. Table 1 includes the water level elevations measured in October 2019 that were used to create the potentiometric maps.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

3. Groundwater Data Summary The groundwater monitoring well network at the site (Figure 2) currently consists of 90 permanent groundwater monitoring wells, including the 29 newly installed wells. Four of the monitoring wells (W-3A, W-49, W-50, and W-71) are screened within the Black Mingo Aquifer while the remaining monitoring wells are screened within the upper surficial, lower surficial, or floodplain aquifers. With the exception of the floodplain vertical groundwater profiling in temporary wells described in Section 3.1, groundwater samples during this phase of work were collected in October 2019 from the entire monitoring well network. Based upon previous assessments, chlorinated volatile organic compounds (CVOCs), nitrate, fluoride, Tc-99 and uranium (U) were identified as COPCs at CFFF. Groundwater samples were analyzed for the following list of constituents to assess if additional COPCs had impacted groundwater:

Target compound list (TCL) VOCs by EPA Method 8260B; TCL SVOCs by EPA Method 8270D; Target analyte list (TAL) Metals by EPA Method 6010D/6020B; nitrate via EPA Method 353.2; ammonia via EPA Method 350.1; fluoride via EPA Method 9056A; isotopic uranium via DOE EML HASL-300 (U-02-RC Modified);

isotopic uranium via EPA Method 200.8/200.2; and technetium-99 via DOE EML HASL-300 (Tc-02-RC Modified).

A summary of the groundwater analytical results from the vertical groundwater profiling is in Table 2. A summary of the groundwater analytical results from the October 2019 groundwater sampling campaign (including the private water supply wells) focusing primarily on the COPCs is in Table 3. A tabulation of the groundwater analytical results for the entire list of analyzed parameters is included as Table A1 in Appendix A. Laboratory analytical results are included in Appendix E. The subsections below discuss the groundwater analytical results by COPC, with the exceptions of Section 3.1 and Section 3.7.

3.1 Floodplain Vertical Groundwater Profiling Previous assessments focused on areas around the plant and above the bluff; therefore, little was known about the geology within the floodplain. Therefore, 13 lithologic borings (L-1 through L-10 and L-17 through L-19) were installed within the floodplain (Figure 5). Borings L-1 through L-10 were installed in June 2019.

Based on an evaluation of the lithologic data and with input from DHEC, an Additional Floodplain Assessment Plan was submitted to DHEC on August 2, 2019 (CFFF, 2019C). The purpose of this additional assessment was to better understand the connectivity and potential migration of COPCs from the sands of the surficial aquifer to sands of the floodplain aquifer prior to the installation of permanent monitoring wells. This plan was approved by DHEC on August 7, 2019. Additional assessment within the floodplain included installation of lithologic borings L-17 through L-19 and collection of groundwater samples from various depth intervals in borings L-1, L-8 though L-10, and L-17 through L-19 in August 2019 (Figure 5).

Tetrachloroethene (PCE) can naturally breakdown to trichloroethene (TCE), to 1,1-Dichloroethene (DCE) or one of DCEs isomers (trans-1,2-DCE or cis-1,2-DCE), and then to vinyl chloride. After vinyl chloride, it further degrades to harmless daughter products beginning with ethene followed by ethane, and finally to carbon dioxide. This process is known as reductive dechlorination and is critical to evaluating the migration and fate of the CVOCs. As shown by the data discussed below, the dechlorination products of PCE and TCE are found in the floodplain samples indicating that the CVOCs are naturally degrading.

TCE and PCE were only detected in floodplain groundwater from borings L-8 at a depth of 25-30 feet below land surface (BLS) and L-9 at a depth of 10-15 feet BLS (Table 2). The groundwater sample from boring L-9 exceeded the PCE maximum contaminant level (MCL) of 5 micrograms per liter (µg /L) at a concentration of 6.5 µg /L. Boring L-9 is AECOM 4

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility located near the bottom of the bluff below monitoring well W-67, which is on top of the bluff near its southern edge and is known to exceed its MCL for PCE and TCE. Boring L-8 is located approximately 525 feet south of boring L-9.

Groundwater from boring L-1 at a depth interval of 28-33 feet BLS contained vinyl chloride (2.7 µg /L) in excess of its maximum contaminant level (MCL) of 2 µg /L. Cis-1,2-DCE, at concentrations below its MCL, was detected in borings L-1 at a depth of 28-33 feet BLS, L-17 at depths of 15-20 and 25-30 feet BLS, L-18 at depth of 24-29 feet BLS and L-19 at depth of 7-12 feet BLS. Trans-1,2-DCE, at a concentration below its MCL, was detected in groundwater from boring L-19 at depth of 7-12 feet BLS. Vinyl chloride, at a concentration below its MCL, was detected in groundwater from boring L-18 at depth of 24-29 feet BLS.

Groundwater from boring L-19 at a depth interval of 7-12 feet BLS contained fluoride above its MCL; however groundwater at a depth of 21-26 feet BLS was below the fluoride MCL. Concentrations of nitrate, below its MCL of 10 milligrams per liter (mg/L), were detected in groundwater from borings L-8 at depths of 8-13 feet BLS and 41-46 BLS, L-9 at a depth of 10-15 feet BLS, L-10 at a depths of 9-14 feet BLS, 18-23 feet BLS, and 28-33 BLS, and L-19 at depths of 7-12 feet BLS and 21-26 BLS.

Based upon the groundwater data (Table 2) collected from these borings, CFFF and AECOM Technical Services, Inc.

(AECOM) personnel proposed locations and screened intervals for four floodplain wells (W-94 through W-97, Figure

2) to DHEC in a September 10, 2019 meeting. DHEC approved installation of these monitoring wells and they were installed in September 2019.

3.2 Chlorinated Volatile Organic Compounds PCE and TCE are the CVOC COPCs at CFFF. The MCL for PCE and TCE of 5 µg /L was exceeded in groundwater from 18 monitoring wells for PCE and in groundwater from 10 monitoring wells for TCE (Table 3). Cis-1,2-DCE was detected in groundwater from 17 monitoring wells at concentrations below its MCL. Groundwater from only one monitoring well (W-95) contained vinyl chloride at 2.9 µg /L which exceeds vinyl chlorides MCL of 2 µg /L.

In general, groundwater exceeding the MCL for TCE is contained within the bounds of groundwater exceeding the MCL for PCE (Figures 6-9). Two exceptions occur in wells W-38 and W-76. TCE detected in W-38 and W-76 groundwater within the upper surficial aquifer was 11 µg /L (PCE = 1.8 µg /L,) and 63 µg /L(PCE = <1.0 µg /L),

respectively. Both monitoring wells are located near the southwestern corner of the plant building.

There are three PCE plumes at CFFF contained within the property. These CVOC plumes are generally referred to as the Western Groundwater Area of Concern (AOC), the main plume, and the eastern plume. These plumes are depicted on Figures 6 through 9. The Western Groundwater AOC consists of groundwater near monitoring well W-19B and impacted downgradient groundwater as indicated by CVOC concentrations in groundwater from monitoring wells W-62, W-68, W-94 and W-95. The main plume emanates from the restricted area and migrates towards the floodplain. The eastern plume emanates from developed portions of the site south of the main plant building near the bluff line.

Monitoring wells installed in the floodplain aquifer are shown on the figures as upper and lower floodplain aquifer wells. Although assessment in the floodplain has not indicated the stratification of the COPC plumes seen in the surficial aquifer, these designations are intended to clarify to which zone of the surficial aquifer the COPCs correspond.

3.3 Nitrate Groundwater from 21 monitoring wells exceeded the MCL of 10 milligrams per liter (mg/L) for nitrate (Table 3). In general, the highest concentrations of nitrate in groundwater are in the vicinity of and downgradient of the wastewater treatment plant (WWTP) lagoons. The extent of nitrate in groundwater exceeding its MCL is displayed on Figure 10 and is generally consistent with previous assessment results.

3.4 Fluoride Groundwater from 14 monitoring wells exceeded the MCL of 4 µg /L for fluoride (Table 3). In general, the highest concentration of fluoride in groundwater is in the vicinity of and downgradient of the WWTP lagoons except for AECOM 5

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility groundwater from monitoring wells W-77 and W-78. Groundwater from monitoring well W-78 contained the highest concentration of fluoride during the October 2019 groundwater sampling campaign. This monitoring well is located upgradient of the WWTP lagoons. The extent of fluoride in groundwater exceeding its MCL is displayed on Figure 11 and is generally consistent with previous assessment results.

3.5 Technetium-99 and Gross Beta Groundwater from two monitoring wells, W-6 and W-11, exceeded the MCL for Tc-99 of 900 picocuries per liter (pCi/L) (Table 3). In general, the Tc-99 concentrations in the surficial aquifer increase with depth. Newly installed lower surficial aquifer wells W-92 (downgradient of W-11) and W-93 (upgradient of W-6) did not contain Tc-99 above the minimum detectible concentration (MDC). The extent of Tc-99 in groundwater exceeding its MCL and isoconcentration contours down to the MDC are displayed on Figure 12 and show that the Tc-99 plume is generally consistent with previous assessment results.

Gross beta concentrations within groundwater are primarily, albeit not exclusively, associated with Tc-99. October 2019 groundwater sampling data was used to generate Figure B in Appendix F. Isoconcentration contour lines have been created at intervals of 10, 50, 100, and 900 pCi/L. A value of 10 pCi/L is 20 percent of the 50 pCi/L gross beta concentration where isotopic analysis for Tc-99 is recommended by the United States Nuclear Regulatory Commission (NRC).

Contouring gross beta and Tc-99 activity concentrations at or near the MDC can be misleading for several reasons.

First, low concentrations in environmental samples generally create high analytical uncertainty. Second, some analytical false positives are anticipated to be reported just above the analytical MDC. Lastly, naturally occurring, beta emitting radioactivity is known to exist in groundwater which would contribute to gross beta results. Conversely, Tc-99 is not naturally occurring. To prevent the potential misinterpretation of groundwater analytical results, contouring isoconcentration values that are greater than the MDC is appropriate, and CFFF plans to prepare future maps in this manner. In areas where wells are co-located at different depths, the higher groundwater analytical result is conservatively used for the purpose of establishing isoconcentration contour lines.

In general, the gross beta plume is very similar to the Tc-99 plume, albeit gross beta is consistently identified at lower concentrations than Tc-99. Mapping gross beta concentrations may have provided useful information in the past when Tc-99 data was lacking. Beginning with the October 2019 sampling campaign, groundwater samples collected from the entire monitoring well network were analyzed for Tc-99; regardless of gross beta concentrations. (Isotopic U analysis in all wells was implemented at the same time.) Because the Tc-99 concentrations are consistently higher than the gross beta concentrations and gross beta does not have a regulatory standard, such as the MCL for Tc-99, CFFF believes that mapping Tc-99 isocontours is more appropriate and representative than mapping gross beta isocontours. Therefore, CFFF proposes that only Tc-99 contours be developed on report figures moving forward.

3.6 Uranium Groundwater from three monitoring wells (W-55, W-56 and newly installed W-77) exceeded the MCL for U of 30 µg /L (Table 3). The plant building is adjacent to and upgradient of monitoring wells W-55 and W-56. Plant infrastructure and the plant building are adjacent to and upgradient of monitoring well W-77. These three wells are screened in the upper surficial aquifer (Figure 13). Monitoring wells side gradient and downgradient of these wells do not contain U above the MCL indicating its limited extent in groundwater.

Groundwater from monitoring well W-77 contained the highest total U concentration of 247 µg /L. Monitoring well W-28 is approximately 55 feet downgradient of monitoring W-77 and is currently sampled on a quarterly basis. U has not been detected above its MCL in W-28 showing that the occurrence at W-77 is of limited extent.

Monitoring well W-37, an upper surficial aquifer well, is located near monitoring well W-55, and this monitoring wells screened interval is only approximately five feet deeper into the upper surficial aquifer. Despite its proximity to monitoring wells W-55 and W-56 containing U at concentrations exceeding the MCL and the small difference in its screened interval, groundwater from W-37 was below (0.0936 micrograms per liter [µg/L] versus an MCL of 30 µg /L) the MCL for U. This data provides further evidence of the limited extent of U.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility 3.7 Private Water Supply Well Sampling Groundwater samples were obtained from October 15 through October 24, 2019 from four private water supply wells (WSW-01 through WSW-04) located west northwest, southwest and south of CFFF (Figure 14). These locations are side to downgradient of the known extent of groundwater impact at the facility. Prior to collecting the groundwater samples from the private water supply wells, CFFF personnel obtained access agreements from the property owners.

Three of the four private water supply wells are located within the 1-mile private water supply well search radius of the site property boundary as specified in the Final RI Work Plan (CFFF, 2019B). The fourth private water supply well is between the southern edge of this radius and the Congaree River. The closest private water supply well, WSW-03, is approximately 5,400 feet (over 1 mile) downgradient of the known extent of COPC impact.

Groundwater samples from these four private water supply wells did not contain COPCs above their respective MCLs (Table 3). Concentrations of U-238, fluoride, nitrate, ammonia and antimony were detected in the groundwater samples at concentrations below their respective MCLs and are not related to groundwater impact caused by manufacturing operations at the site.

3.8 Non-Constituents of Potential Concern Groundwater from the monitoring well network and private water supply wells were analyzed for an expanded parameter list, in addition to the known COPCs, to assess if additional COPCs occur in site groundwater. No new COPCs attributable to site activities were identified.

Antimony (Table 3) was detected at estimated concentrations (J flag value - concentration is above the method detection limit but below the reporting limit) above its MCL of 6 µg /L in groundwater from 11 monitoring wells, including one from a background location. The highest reported concentration was of Antimony was 8.91 µg /L.

CFFF personnel are not aware of historic or current manufacturing activities using antimony that could have impacted groundwater at the site, and this occurrence is believed to represent naturally occurring antimony as indicated by its detection in a background well.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

4. Surface Water Data Summary Surface water samples were collected from 12 locations within the on-site ditches, the Gator Pond, and Mill Creek (Upper and Lower Sunset Lakes). The ditch at one sampling location (SW-15) was dry; therefore, a surface water sample was unable to be collected from this location.

Results of the bathymetric surveys indicate that the depth of the Gator Pond is approximately 8.5 feet deep and the depths of Upper Sunset Lake and Lower Sunset Lake are approximately 5 to 6 feet deep.

Surface water sampling locations are displayed on Figure 15. A summary of surface water data focusing primarily on the COPCs is in Table 4. A tabulation of the surface water analytical results for the entire list of analyzed parameters is included as Table A2 in Appendix A. Laboratory analytical results are located in Appendix E. The subsections below discuss the surface water analytical results by COPC. As discussed in the sections below, the data does not identify potentially significant surface water impact.

4.1 Chlorinated Volatile Organic Compounds Surface water from sampling locations SW-17 and SW-18 (Figure 15) contained PCE above its MCL (5 µg /L) at concentrations of 16 µg /l and 14 µg /L, respectively (Table 4). TCE was also detected in surface water sample SW-17 at a concentration of 1.0 µg /L. CVOCs were not detected in any other surface water samples. The ditch in the vicinity of SW-17 is deeply incised, particularly after crossing the road downstream of surface water sample location SW-16. The depth of the ditch west of the road is approximately 12-15 feet BLS. This detection of PCE and TCE confirms that groundwater locally discharges to the ditch, but CVOC concentrations rapidly attenuate.

4.2 Nitrate Nitrate was detected at concentrations below its MCL (Table 4) in surface water samples SW-14, SW-16, SW-17, SW-18 and SW-23 (Figure 15). The highest nitrate concentration was detected in surface water sample SW-23 which is located in the Gator Pond. Groundwater in the upper surficial aquifer discharges to this surface water body which in turn recharges groundwater downgradient of the pond, particularly when precipitation causes the water level in the pond to rise, thereby creating a higher hydraulic head than static conditions.

4.3 Fluoride Fluoride was detected in every surface water sample collected during this phase of work. The highest fluoride concentration (Table 4) was detected in surface water sample SW-23 (Figure 15) which is located in the Gator Pond.

Surface water from the Gator Pond exceeded the MCL for fluoride of 4 µg /L at a concentration of 4.9 µg /L. The remaining fluoride detections were below the MCL.

4.4 Technetium-99 Tc-99 was not detected above the MDC in any surface water samples collected during this phase of work.

4.5 Uranium Uranium isotopes U-235 and U-238 were detected (Table 4) in most of the surface water samples (Figure 15) but at concentrations below the 30 µg/L MCL. To make the comparison, the results of isotopic uranium analysis were summed (Total Uranium) and compared to the MCL. The results were less than the MCL by more than an order of magnitude.

4.6 Non-Constituents of Potential Concern There were no detections of non-COPC analytes above their respective MCLs.

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5. Sediment Data Summary Sediment samples from the 18 locations included in the Final RI Work Plan (CFFF, 2019B) were collected in mid-July 2019. Four of these sediment samples were sludge samples from the WWTP Sanitary Lagoon and the East Lagoon. Based on an evaluation of the initial sediment data and with input from DHEC, a Sediment Transect Sampling Plan was submitted to DHEC on October 25, 2019 documenting proposed additional sediment sampling locations within Mill Creek including Upper and Lower Sunset Lakes (CFFF, 2019D). DHEC approved the Sediment Transect Sampling Plan on November 1, 2019. The purpose of this additional assessment was to obtain more robust data on sediment quality and to ensure no uranium has moved offsite.

The additional 45 sediment samples, not including quality assurance/quality control (QA/QC) samples, were collected from November 20, 2019 through December 2, 2019, bringing the total number of sediment samples to 63.

Sediment samples collected in the on-site ditches, Upper Sunset Lake and Lower Sunset Lake were surficial (0-6 inches) only. Sediment samples upstream of the Entrance Dike (background samples) and below the Lower Sunset Lake Dike were collected at two depth intervals, 0-6 inches and 6-12 inches. Samples from a third interval, 12-16 inches, were obtained from a few sampling locations and analyzed for radionuclides and other constituents where possible, based on sample volume. Sediment within the on-site ditches consists of silty sand while sediment within Upper and Lower Sunset Lakes consists of clayey silt with some sand.

Sediment sampling locations are displayed on Figure 16. A summary of sediment data focusing primarily on the COPCs is in Table 5. A tabulation of the sediment analytical results for the entire list of analyzed parameters is included as Table A3 in Appendix A. Laboratory analytical results are located in Appendix E. The subsections below discuss the sediment analytical results by COPC. As discussed below, the data identify limited environmental impact to sediment which is well defined and contained within the CFFF site.

5.1 Chlorinated Volatile Organic Compounds PCE was detected in sediment sample SED-17 (Figure 16) at a concentration of 5.5 µg /kg (Table 5). A duplicate sample associated with this sediment sampling location did not contain PCE (<4.8 µg /kg). No other CVOCs were detected in the sediment samples.

5.2 Nitrate Nitrate was detected in 29 sediment samples (Figure 16) at concentrations ranging from 0.20 milligrams per kilogram (mg/kg) to 2.7 mg/kg (Table 5). The highest concentrations of nitrate in sediment were in samples SED-16 and SED-

17. These sample locations are within the extent of the nitrate groundwater plume where impact exceeds the MCL and in areas where the on-site ditch is deeply incised.

5.3 Fluoride Fluoride was detected in 52 sediment samples (Figure 16) at concentrations ranging from 0.69 mg/kg to 49.2 mg/kg (Table 5) for samples not collected from within the two WWTP lagoons. A sludge sample from within the Sanitary Lagoon contained the highest concentration of fluoride at 53.3 mg/kg. The highest concentrations of fluoride in sediment outside of the Sanitary Lagoon were in sediment samples SED-23 (38.1 mg/kg) and SED-24 (49.2 mg/kg) collected within the Gator Pond.

5.4 Technetium 99 Tc-99 was detected (Table 5) above the Residential Use Screening Level (RUSL, [NUREG, 2006]) in sediment samples SED-23 and SED-24 (Figure 16) collected within the Gator Pond. RUSLs are based upon a residential, light farming exposure modeling scenario (including ingestion of homegrown produce) where a full-time resident spends 200 days/year (yr) indoors, 70 days/yr outdoors and 4 days/yr gardening for a total time of direct exposure of 274 days/yr 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s/day for a dose equivalent of 25 millirem per year (mrerm/yr).

These screening levels represent highly conservative concentrations at which an unrealistic amount of direct exposure to a member of the public (i.e. in active contact with the soil containing these concentrations) results in a AECOM 9

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility low dose (25 mrem/yr) of radiation exposure. According to the NRC website, the average persons dose equivalent exposure to radiation per year from natural and manmade sources is approximately 620 mrem/yr (NRC, 2020). For reference, the National Council on Radiation Protection and Measurements (NCRP) reports that the radiation dosage of a full body CT scan is approximately 1,000 mrem/exam and a CT scan of the head is approximately 200 mrem/exam (NCRP, 2009).

5.5 Uranium U isotopes were detected (Table 5) above their RUSL in nine sediment sample locations, including the four sludge samples (Figure 16) from the WWTP lagoons (Sanitary and East). Sediment from one location (SED-16) within the on-site ditch and four locations (SED-19, SED-20, SED-22, and SED-43) within Upper and Lower Sunset Lakes at the 0-6 inch sampling interval exceeded the RUSL. U-233/234 were the most common isotopes exceeding RUSL with concentrations in sediment samples from the on-site ditch and Upper and Lower Sunset Lakes ranging from 14.9 picocuries per gram (pCi/g) to 117 pCi/g versus an RUSL of 13 pCi/g.

Total dosage of radiation exposure is calculated using a sum of fractions (SOF) or SOF approach when multiple radionuclides are present. A SOF value less than 1.0 indicates that the total dosage is less than 25 mrem/yr and a value greater than or equal to 1.0 means that the total dosage is at least 25 mrem/yr. Sediment samples SED-11, SED-12, and SED-51 through SED-56 are considered background sediment samples. Further explanation and SOF analysis is contained in the Technical Basis Document - Sediment Sampling and Sediment Transect Results for the Westinghouse Columbia Fuel Fabrication Facility (WCFFF) located in Appendix B (Leidos, 2020).

One sludge sample (SED-25) from the Sanitary Lagoon Area Operable Unit exceeded the Industrial Use Screening Level (IUSL) of 39 pCi/G for U 235/236 at concentration of 41.1 pCi/g. This sample also contained the highest U 233/234 concentration at 907 pCi/g, which is below the IUSL of 3,310 pCi/g. The Sanitary Lagoon is an earthen, unlined lagoon within a controlled and fenced area of the facility that was built in 1968 for treating site sanitary sewage according to CFFF personnel. An extended aeration package plant was added in 1975. Under the CA, further assessment of this operable unit will be performed.

This lagoon receives sanitary wastewater from the Chemical Area Operable Unit of the facility that may contain U from showering and handwashing. Wastewater within this lagoon is treated in an extended aeration package plant prior to discharge to a polishing lagoon. Larger solid materials within the wastewater are removed by the package plant while finer solids pass through the package plant screens and settle within the lagoon. U has a high affinity to adsorb to organic materials such as the biosolids in the Sanitary Lagoon.

Effluent discharge from the WWTP to the Congaree River is monitored for various analytes under National Pollution Discharge Elimination System (NPDES) permit # SC0001848. As part of the facilitys regulatory requirement to the NRC under 10 CFR 40.65 and 10 CFR 70.59 Effluent Monitoring Reporting Requirements, effluents from plant operations are also monitored to assess the quantities of radionuclides discharged into the environment. The cumulative radioactivity released is summarized semi-annually and annually and input into models developed by the NRC and EPA to estimate the dose to the public. According to the February 25, 2020 NRC Annual Discharge Report (CFFF, 2020E), the facilitys discharge of U from the WWTP over the period of January through December 2020 was an order of magnitude below the NRC and EPA regulatory limits designed to protect public health and safety.

5.6 Non-Constituents of Potential Concern Of the 63 sediment samples (not including field duplicates) analyzed for VOCs, 49 sediment samples (Figure 16) contained concentrations of Acetone (Table 5) and 18 sediment samples contained concentrations of 2-butanone (also known as methyl ethyl ketone or MEK). Of the 14 background sediment samples (not including field duplicates),

10 sediment samples contained acetone and four sediment samples contained 2-butanone. CFFF personnel are not aware of historic or current manufacturing activities using acetone or 2-butanone that could have impacted sediment at the site.

According to the National Institute of Health (NIH, 2020), acetone occurs naturally in plants, trees, forest fires, vehicle exhaust and in the metabolic breakdown of fats in animals and 2-butanone is a metabolic byproduct of plants and animals, is released into the atmosphere by volcanoes and forest fires and is commonly found in food such as fruits and vegetables.

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6. Technetium-99 Soil Data Summary Soil samples were collected for Tc-99 analysis at 14 locations in potential source areas. Four samples were collected from each location at depths of 0-1 foot BLS, 1-3 feet BLS, 3-5 feet BLS and 5-7 feet BLS. No Tc-99 was detected in the soil samples above the MDC. Analytical results for Tc-99 are summarized in Table 6. Soil sampling locations are displayed on Figure 17. Laboratory analytical results are located in Appendix E. Since no source area was identified, additional sampling will be conducted in accordance with the work plan approved by DHEC on February 13, 2020.

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7. Hydraulic Characteristics of the Floodplain Hydraulic conductivity tests (slug tests) were performed in the four newly installed floodplain monitoring wells (W-94 through W-97). Slug tests were conducted to provide estimates of the hydraulic conductivity in the portion of the aquifer immediately surrounding a well screen. Slug tests were conducted by two methods, falling head test (slug in) and rising head test (slug out).

Falling head tests were conducted by quickly inserting a solid polyvinyl chloride (PVC) cylinder (slug) into a well. The resulting water level rises and is then monitored with time as it declines back toward static level. Rising head tests were conducted by quickly removing a submerged slug from a well. The resulting water level declines and then is monitored with time as it rises back to static level. Changes in water levels were monitored using pressure transducer data loggers (In-Situ Level TROLL 700 or similar). The testing methods and data analysis followed the procedures described by Bouwer and Rice (1976) and Bouwer (1989).

Slug tests were previously conducted on monitoring wells W-13R, W-15, W-39, W-48, W-60 and W-61 in December 2018. The results of these slug tests have not been reported and are included with this report. The purpose of these slug tests was to better understand groundwater flow velocity within the upper and lower surficial aquifers in areas impacted by CVOCs. This data will be evaluated in the RI Report with hydraulic conductivity data collected in the surficial aquifer during previous scopes of work.

Estimates of the hydraulic conductivity in the floodplain aquifer (monitoring wells W-94 through W-97) range from 5.31 feet per day (ft/day) in monitoring well W-94 to 80.45 ft/day in monitoring well W-94 with an average hydraulic conductivity of 46.82 ft/day. The hydraulic conductivity test results are summarized on Table 7 and are provided in Appendix C.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

8. Conceptual Site Model As documented in the Final RI Work Plan (CFFF, 2019B), the Conceptual Site Model (CSM) evolves through site investigation and remediation life cycles. At different stages in the investigation and remedy analysis, CSMs serve different purposes. CFFF is currently in the investigation stage. The purpose of the investigation CSM is to support the decision process, leading to interim remedial action (as appropriate), remedial investigation, feasibility analysis, and selection of site remedy.

The CSM has been enhanced by additional lithologic, bathymetric and COPC data. This data validated geologic understanding above the bluff, provided valuable information about the geology of the floodplain, and furthered the understanding of groundwater/surface water interaction. Incorporation of the data collected during this phase of work into the CSM reshaped it into a more effective decision-making tool. Selected outputs of the current CSM, known as Rev. 1, are contained in Appendix D.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

9. Private Water Supply Well Survey During this phase of work, a private water supply well survey was conducted within a 1-mile radius of the facilitys property boundary. As documented in Section 3.7, CFFF obtained access agreements and groundwater samples from four private water supply wells (WSW-01 through WSW-04) on properties west, southwest and south of the developed area of the CFFF property. These wells are side gradient to downgradient of the site.

The closest downgradient private water supply well is approximately 5,400 feet (over 1 mile) southwest of the known extent of COPC impact. One of the properties to the west also contained two wells that are not in use. As discussed in Section 3.7, analysis of groundwater samples from four private water supply wells identified no COPCs related to manufacturing operations at CFFF.

AECOM personnel conducted a windshield survey for private water supply wells for upgradient properties, generally including those properties northwest, north and northeast of the facility. This survey identified 30 additional water supply wells within the search radius. The closest upgradient private water supply well is located approximately 4,400 feet north of the known extent of COPC impact. Results of the private water supply well survey are in Table 8 and displayed on Figure 14. The survey results reinforce that there is no potential for COPCs from CFFF to impact private water supply wells.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

10. Variances from the Remedial Investigation Work Plan The following variances from the Final RI Work Plan (CFFF, 2019B) occurred during this scope of work:

After the submittal of the June 2019 Final RI Work Plan (CFFF, 2019B), DHEC requested that an additional staff gauge be installed within Mill Creek. This staff gauge was installed within Mill Creek downstream of the Lower Sunset Lake Dike spillway.

Field parameters (i.e. dissolved oxygen, turbidity) were not collected during surface water sampling. This oversight did not affect the analytical results of these samples.

Vertical groundwater profiling in the floodplain was not part of the Final RI Work Plan (CFFF, 2019B). This additional groundwater assessment was proposed in the Additional Floodplain Assessment Plan (CFFF, 2019C) submitted to DHEC on August 2, 2019 and approved by DHEC on August 7, 2019.

Several underground electric lines were located close to the proposed locations of the monitoring well pair W-77 and W-93 and did not allow safe clearance for drilling activities. Therefore, these wells were installed approximately 50 feet southeast of their proposed locations.

Concrete approximately one foot below the asphalt surface of the road paralleling the southern portion of the Chemical Area Operational Unit and the facilitys power bank running down the middle of the northern lane of this road resulted in monitoring well W-78 being moved across the road. Therefore, monitoring well W-78 was installed approximately 25 feet south of its proposed location.

Monitoring wells W-83 and W-86 were installed deeper into the surficial aquifer due to an anomalously thick clay layer at the surface. The top 26 and 23 feet, respectively, of the subsurface in the area of these two wells consisted of clay or silty clay compared to approximately 8 feet of silt or clay in other areas of the developed portion of the site. This clay deposit may represent a former oxbow lake or abandoned stream channel that slowly filled by silt and clay overbank deposits.

Additional sediment sampling was conducted within Mill Creek including Upper and Lower Sunset Lakes. A Sediment Transect Sampling Plan (CFFF, 2019D) was submitted to DHEC on October 25, 2019 documenting proposed additional sediment sampling locations within Mill Creek. DHEC approved the Sediment Transect Sampling Plan (CFFF, 2019D) on November 1, 2019.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

11. Conclusions and Recommendations 11.1 Conclusions The following conclusions can be drawn from this newly acquired data:

Groundwater, surface water and sediment data indicate that there are no COPCs migrating off the site.

No Tc-99 was identified above the MDC in the sampled soil to further evaluate Tc-99 sourcing.

Analysis of samples from four private water supply well analysis identified no COPCs related to CFFF. The closest private water supply well is approximately 5,400 feet (over 1 mile) downgradient of the known extent of COPC impact. The survey findings reinforce that there is no potential for COPCs from CFFF to impact private water supply wells.

The documented impact poses no potentially significant threat to plant workers, the general public or the environment.

In general, the vertical and horizontal extent of COPC impacts has been further defined and shows that the groundwater plume sizes and locations are similar to previously identified impacts. Analysis of groundwater samples collected from the newly installed monitoring network around the primary manufacturing area identified U in one well. The impact of U is well defined and limited to an area immediately adjacent to the plant building.

Conditions within the floodplain are conducive to natural degradation of the CVOC plume which will limit its size.

Sediment impacted by COPCs is limited and well defined.

An improved understanding of site geology and hydrogeology has been developed, particularly with respect to the floodplain and how shallow groundwater interacts with surface water and sediment. The Conceptual Site Model (CSM) has been enhanced by the newly acquired data making it a more effective decision-making tool.

11.2 Recommendations Based on the data collected during this phase of work, CFFF recommends the following:

Conduct additional assessment as necessary to fill identified data gaps. A Phase II RI Work Plan documenting the scope of work for Phase II assessment will be submitted to DHEC for review and input.

Complete the additional Tc-99 investigation work plan approved by DHEC on February 13, 2020, to further evaluate potential Tc-99 source areas since none have yet been identified.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility

12. References Bouwer, H., 1989. The Bouwer and Rice slug test - an update, Ground Water, vol. 27, no. 3, pp. 304-309.

Bouwer, H. and R.C. Rice, 1976. A slug test method for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells, Water Resources Research, vol. 12, no. 3, pp. 423-428.

CFFF, 2019A. Remedial Investigation Work Plan, Westinghouse Columbia Fuel Fabrication Facility, April 2019.

CFFF, 2019B. Final Remedial Investigation Work Plan, Westinghouse Columbia Fuel Fabrication Facility, June 2019.

CFFF, 2019C. Additional Floodplain Assessment Plan, Columbia Fuel Fabrication Facility, August 2, 2019.

CFFF, 2019D. Sediment Transect Sampling Plan, Westinghouse Electric Company, LLC, Columbia Fuel Fabrication Facility, Richland County, SC, October 25, 2019.

CFFF, 2020E. LTR-RAC-20-21, NRC Semi-Annual Discharge Report, February 25, 2020.

CFFF, 2019F. 2018-2019 Annual Groundwater Monitoring Report, Westinghouse Electric Company, LLC, Columbia Fuel Fabrication Facility, Richland County, SC, October 25, 2019.

DNR Geologic Survey, 2011. Geologic Map of the Fort Jackson South Geologic Quadrangle, Calhoun and Richland Counties, South Carolina, GQM-52, Kimberly M. Meitzen 2011.

Leidos, 2020. Technical Basis Document - Sediment Sampling and Sediment Transect Results for the Westinghouse Columbia Fuel Fabrication Facility (WCFFF), Revision 1, July 13, 2020.

NCRP, 2009. Ionizing Radiation Exposure of the Population of the United States, Bethesda, MD: National Council on Radiation Protection and Measurements; NCRP Report No. 160.

NIH websites https://pubchem.ncbi.nlm.nih.gov/compound/Acetone, https://pubchem.ncbi.nlm.nih.gov/compound/Methyl-ethyl-ketone, reviewed by Mr. Jeremy Grant of AECOM on January 10, 2020.

NRC website https://www.nrc.gov/about-nrc/radiation/around-us/sources.html, reviewed by Mr. Jeremy Grant of AECOM on January 10, 2020.

NRC, 2006. NUREG-1757 Vol. 1, Rev.2 Consolidated Decommissioning Guidance, Appendix H: Memorandum of Understanding between the Environmental Protection Agency and the Nuclear Regulatory Commission, Final Report September 2006.

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Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Tables AECOM

Table 1 Summary of Well Construction Details and Groundwater Elevations Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Ground Top of Well Total Screen Screen Screen Interval Depth to Groundwater Date Surface Casing Well Diameter Depth Length Interval Elevation Water Elevation Measured Elevation Elevation (in) (ft bgs) (ft) (ft bgs) (ft bgs) (ft) (ft)

(ft) (ft)

WRW1 4 10/14/19 32.20 10 136.00 136.95 22.232.2 113.8103.8 9.64 127.31 WRW2 4 10/14/19 28.43 10 136.98 139.93 1929.2 118.55108.55 18.62 121.31 W3A 2 10/14/19 82.86 10 117.64 120.08 72.582.5 44.834.8 8.79 111.29 W4 4 10/14/19 15.01 2 116.50 116.09 1012 103.5101.5 10.38 105.71 W6 2 10/14/19 27.78 5 136.96 136.46 23.528.5 114.2109.2 11.22 125.24 W7A 2 10/14/19 17.92 5 132.94 135.06 1318 120115 12.35 122.71 W10 2 10/14/19 22.30 5 136.89 136.81 18.523.5 119.6114.6 16.50 120.31 W11 2 10/14/19 24.90 3 138.45 140.76 25.528.5 116.55113.55 19.02 121.74 W13R 2 10/14/19 20.52 5 136.38 136.13 1520 120.9115.9 12.96 123.17 W14 2 10/14/19 28.91 5 136.22 137.83 23.528.5 112.3107.3 17.62 120.21 W15 2 10/14/19 20.66 5 126.67 127.90 13.518.5 111106 12.90 115.00 W16 2 10/14/19 13.23 3 125.64 124.93 15.518.5 115.4112.4 3.71 121.22 W17 2 10/14/19 27.92 5 137.57 139.27 23.528 114.65109.65 14.56 124.71 W18R 2 10/14/19 27.63 5 137.15 136.71 12.517.5 114.5109.5 12.20 124.51 W19B 4 10/14/19 40.73 10 140.58 142.85 3040.5 109.8599.85 25.17 117.68 W20 2 10/14/19 15.66 5 113.27 116.16 11.516.3 102.697.6 10.60 105.56 W22 2 10/14/19 15.10 5 137.08 136.51 13.417.8 127122 11.68 124.83 W23R 2 10/14/19 20.93 5 137.45 140.47 15.520.5 121.5116.5 19.19 121.28 W24 2 10/14/19 15.00 5 139.83 141.94 10.115.1 129.85124.85 11.78 130.16 W25 2 10/14/19 27.25 5 114.98 115.88 22.927.7 92.7587.75 10.95 104.93 W26 2 10/14/19 30.64 5 140.59 142.21 25.530.5 114.95109.95 26.37 115.84 W27 2 10/14/19 14.72 5 120.22 121.87 14.118.9 110.5105.5 11.28 110.59 W28 2 10/14/19 15.30 5 136.98 138.88 9.814.7 126.7121.7 12.60 126.28 W29 2 10/14/19 13.95 5 136.96 138.61 1015.1 128123 12.41 126.20 W30 2 10/14/19 14.86 5 136.87 138.81 10.215.2 127122 12.65 126.16 W32 2 10/14/19 21.75 5 138.33 140.61 1722.5 121.6116.6 19.59 121.02 W33 2 10/14/19 22.88 5 138.06 139.33 15.120.7 120.2115.2 15.85 123.48 W35 2 10/14/19 20.35 5 136.59 139.07 1621 121.25116.25 11.78 127.29 W36 2 10/14/19 19.77 5 134.16 136.29 1520 119.4114.4 8.66 127.63 W37 2 10/14/19 20.46 5 136.58 139.04 15.520.5 121.1116.1 12.05 126.99 W38 2 10/14/19 20.16 5 136.71 136.51 1520 121.55116.55 10.45 126.06 W39 2 10/14/19 23.17 10 139.08 141.15 1222 125.9115.9 16.25 124.90 W40 2 10/14/19 14.39 10 136.42 139.26 515 132.05122.05 11.95 127.31 W41R 2 10/14/19 24.33 10 131.02 133.81 1424 116.7106.7 15.94 117.87 W42 2 10/14/19 29.91 10 137.83 140.96 2030 117.9107.9 26.32 114.64 W43 2 10/14/19 21.12 10 138.09 141.33 10.520.5 126.95116.95 15.65 125.68 W44 2 10/14/19 27.04 10 131.93 134.86 1626 114.9104.9 18.42 116.44 W45 2 10/14/19 15.38 10 137.20 140.02 616 131.8121.8 12.85 127.17 W46 4 10/14/19 25.84 10 132.39 134.74 15.525.5 116.55106.55 14.02 120.72 W47 4 10/14/19 45.60 10 140.70 141.90 34.344.8 105.195.1 26.99 114.91 W48 4 10/14/19 41.30 10 139.74 142.56 30.741.3 108.4598.45 27.21 115.35 W49 2 10/14/19 117.77 10 137.82 140.25 105115 30.0520.05 31.07 109.18 W50 2 10/14/19 125.41 10 136.79 139.58 114.5124.5 21.411.4 25.27 114.31 W51 2 10/14/19 14.66 5 136.67 136.51 1015 127122 9.27 127.24 W52 2 10/14/19 15.55 5 136.71 136.19 1015 126.15116.15 9.15 127.04 W53 2 10/14/19 15.74 5 136.83 136.54 1015 126.1121.1 9.42 127.12 W54 2 10/14/19 15.85 5 136.79 136.52 1015 125.95120.95 9.53 126.99 W55 2 10/14/19 15.24 5 136.90 136.63 1015 126.65121.65 9.72 126.91 Page 1 of 2

Table 1 Summary of Well Construction Details and Groundwater Elevations Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Ground Top of Well Total Screen Screen Screen Interval Depth to Groundwater Date Surface Casing Well Diameter Depth Length Interval Elevation Water Elevation Measured Elevation Elevation (in) (ft bgs) (ft) (ft bgs) (ft bgs) (ft) (ft)

(ft) (ft)

W56 2 10/14/19 15.11 5 136.83 136.68 1015 126.7121.7 9.75 126.93 W57 2 10/14/19 15.11 5 136.90 136.73 1015 126.8121.8 9.97 126.76 W58 2 10/14/19 15.49 5 136.85 136.37 1015 126.35121.35 10.63 125.74 W59 2 10/14/19 14.65 5 136.10 136.42 1015 126.45121.45 10.77 125.65 W60 2 10/14/19 37.86 5 137.25 140.20 3237 104.499.4 22.12 118.08 W61 2 10/14/19 23.51 10 137.34 140.60 1323 123.85113.85 18.96 121.64 W62 2 10/14/19 24.85 5 125.63 128.38 1924 105.8100.8 13.59 114.79 W63 2 10/14/19 41.91 5 138.78 141.02 3742 101.8596.85 27.31 113.71 W64 2 10/14/19 31.61 10 140.15 142.75 2131 118.55108.55 27.25 115.50 W65 2 10/14/19 31.59 5 138.17 140.95 26.531.5 111.6106.6 14.07 126.88 W66 2 10/14/19 22.34 10 138.01 140.91 1222 125.65115.65 13.72 127.19 W67 2 10/14/19 31.81 10 132.60 135.26 2131 110.8100.8 19.54 115.72 W68 2 10/14/19 18.14 5 113.40 116.53 1318 100.2595.25 7.90 108.63 W69 2 10/14/19 18.08 10 137.67 140.64 7.7517.75 129.6119.6 9.75 130.89 W70 2 10/14/19 48.92 5 138.02 141.00 4449 94.1089.1 14.88 126.12 W71 2 10/14/19 103.03 10 137.96 140.72 93103 44.934.9 25.98 114.74 W72 2 10/14/19 15.00 10 136.81 136.29 515 131.8121.8 9.24 127.05 W73 2 10/14/19 16.09 10 136.85 136.45 515 130.75120.75 9.61 126.84 W74 2 10/14/19 30.60 5 136.64 139.93 2530 111.05106.05 13.46 126.47 W75 2 10/14/19 15.33 10 136.60 139.85 515 131.25121.25 13.06 126.79 W76 2 10/14/19 15.12 10 137.04 136.85 515 131.9121.9 9.78 127.07 W77 2 10/14/19 15.67 10 136.85 136.53 515 131.2121.2 9.98 126.55 W78 2 10/14/19 15.57 10 136.75 136.31 515 131.2121.2 10.05 126.26 W79 2 10/14/19 15.66 10 136.49 136.12 515 130.85120.85 9.06 127.06 W80 2 10/14/19 15.62 10 136.34 135.87 515 130.7120.7 11.08 124.79 W81 2 10/14/19 15.74 10 136.81 136.43 515 131.1121.1 12.02 124.41 W82 2 10/14/19 15.69 10 136.57 136.23 515 130.1120.1 12.72 123.51 W83 2 10/14/19 26.46 10 136.22 135.81 15.525.5 119.75109.75 13.95 121.86 W84 2 10/14/19 21.05 10 136.66 135.99 1020 125.6115.6 8.45 127.54 W85 2 10/14/19 44.77 5 135.74 138.69 3944 95.9590.95 22.01 116.68 W86 2 10/14/19 35.09 10 135.68 138.77 2434 110.6100.6 20.59 118.18 W87 2 10/14/19 33.17 5 136.66 136.39 2732 108.5103.5 8.93 127.46 W88 2 10/14/19 41.37 5 140.06 143.10 3641 103.798.7 23.42 119.68 W89 2 10/14/19 25.46 10 140.12 142.82 1525 124.65104.65 22.10 120.72 W90 2 10/14/19 39.90 5 140.23 143.33 3540 105.35100.35 27.38 115.95 W91 2 10/14/19 25.05 10 139.57 142.81 1525 124.5114.5 27.56 115.25 W92 2 10/14/19 33.67 5 120.11 123.33 2934 91.4586.45 17.77 105.56 W93 2 10/14/19 35.38 5 136.87 136.49 3035 106.5101.5 10.42 126.07 W94 2 10/14/19 29.40 5 115.28 118.04 2429 90.985.9 12.14 105.90 W95 2 10/14/19 33.41 5 113.53 116.40 2833 85.1580.15 10.71 105.69 W96 2 10/14/19 30.03 5 113.65 116.46 2530 88.683.6 11.08 105.38 W97 2 10/14/19 18.91 5 113.92 116.93 1318 10095 7.43 109.50 Gator SG 10/14/19 120.31 0.85 117.16 Upper SG 10/14/19 112.41 0.60 109.01 Lower SG 10/14/19 112.39 0.26 108.65 Creek SG 10/14/19 109.05 0.64 105.69 Notes in inch ft feet ft bgs feet below ground surface SG staff gauge Page 2 of 2

Table 2 Summary of Floodplain Vertical Groundwater Profiling Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well L1 L1 L1 L1 L1 L1DUP L8 L8 L8 L8 L9 L9 Depth 10 15 ft 28 33 ft 48 53 ft 63 68 ft 78 83 ft 78 83 ft 8 13 ft 17 22 ft 25 30 ft 41 46 ft 10 15 ft 23 28 ft Date 8/14/2019 8/14/2019 8/14/2019 8/15/2019 8/15/2019 8/15/2019 8/20/2019 8/21/2019 8/21/2019 8/21/2019 8/21/2019 8/21/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Fluoride 4 mg/L NA NA NA NA NA NA 0.26 < 0.10 < 0.10 0.14 0.48 < 0.10 Chemical Nitrate as N 10 mg/L NA NA NA NA NA NA 0.081 < 0.020 < 0.020 < 0.020 5.4 < 0.020 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA* < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 cis1,2Dichloroethene 70 ug/L < 1.0 3.8 < 1.0 < 1.0 < 1.0 < 1.0 NA* < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA* < 1.0 2.2 < 1.0 6.5 < 1.0 VOCs trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA* < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 NA* < 1.0 2.1 < 1.0 3.0 < 1.0 Vinyl chloride 2 ug/L < 1.0 2.7 < 1.0 < 1.0 < 1.0 < 1.0 NA* < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 1 of 2

Table 2 Summary of Floodplain Vertical Groundwater Profiling Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well L9DUP L9 L10 L10 L10 L17 L17 L18 L18 L19 L19 Depth 23 28 ft 32 37 ft 9 14 ft 18 23 ft 28 33 ft 15 20 ft 25 30 ft 15 20 ft 24 29 ft 7 12 ft 21 26 ft Date 8/21/2019 8/21/2019 8/19/2019 8/20/2019 8/20/2019 8/16/2019 8/16/2019 8/19/2019 8/19/2019 8/20/2019 8/20/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Fluoride 4 mg/L < 0.10 < 0.10 < 0.10 < 0.10 < 0.10 NA NA NA NA 7.8 0.16 Chemical Nitrate as N 10 mg/L < 0.020 < 0.020 1.1 0.18 0.19 NA NA NA NA 0.092 0.10 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 6.2 5.4 < 1.0 1.2 1.0 < 1.0 Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.3 < 1.0 Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.1 < 1.0 < 1.0 Notes: MCL Maximum Contaminant Level mg/L milligrams per liter ug/L micrograms per liter Bold concentrations indicate detections Concentrations in shaded cells exceed their MCL NA Not Analyzed NA* Not Analyzed due to an oversight by Sample Receiving at the lab not logging the VOC sample bottles in. As a result, the sample was not analyzed for VOCs.

Page 2 of 2

Table 3 Summary of October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well WRW1 WRW2 W3A W4 W6 W7A W10 W10DUP W11 W13R W14 W15 W16 W17 W18R W19B W20 W22 W23R W24 Date 10/3/2019 10/11/2019 10/10/2019 10/10/2019 10/7/2019 10/9/2019 10/9/2019 10/9/2019 10/8/2019 10/8/2019 10/18/2019 10/21/2019 10/21/2019 10/21/2019 10/7/2019 10/21/2019 10/15/2019 10/7/2019 10/18/2019 10/11/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L < 5.00 < 5.00 < 5.00 < 5.00 9.09 6.35 3.19 < 5.00 7.82 < 5.00 4.27 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Beta particles 50** pCi/L 3.98 11.9 < 5.00 19.4 1370 114 81.3 76.2 2450 53.2 35.6 174 10.6 538 150 < 5.00 < 5.00 29.6 < 5.00 < 5.00 Technetium99 900 pCi/L < 50.0 < 50.0 < 50.0 41.3 2440 210 118 121 3420 63.4 < 50.0 253 < 50.0 820 214 < 50.0 < 50.0 57.4 < 50.0 < 50.0 Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 0.035 J < 0.070 < 0.070 0.0177 J < 0.070 < 0.070 Uranium238 ug/L 0.0815 J 0.0743 J < 0.200 0.146 J 0.232 0.698 0.083 J 0.114 J < 0.200 0.139 J 0.368 < 0.200 < 0.200 0.0855 J 4.06 < 0.200 < 0.200 0.854 < 0.200 < 0.200 Total Uranium 30 ug/L 0.0815 J 0.0743 J < 0.200 0.146 J 0.232 0.698 0.083 J 0.114 J < 0.200 0.139 J 0.368 < 0.200 < 0.200 0.0855 J 4.1 < 0.200 < 0.200 0.872 < 0.200 < 0.200 Chemical Fluoride 4 mg/L 0.055 0.099 0.015 4.86 0.126 6.47 3.32 3.25 0.021 8.11 0.079 1.88 9.5 2.22 6.34 0.019 0.077 5.52 0.017 0.025 Nitrate as N 10 mg/L 2.1 20 < 0.020 0.023 210 390 37 37 56 18 0.061 35 3.2 16 770 3.8 < 0.020 100 0.71 < 0.020 Ammonia mg/L 0.0129 0.0581 0.0256 0.404 134 48.5 6.46 6.62 4.09 31.5 4.26 12.6 13.3 5.79 126 0.0146 0.0632 61.8 0.0154 0.0283 Metals Antimony 6 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 2.8 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.3 1.5 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Tetrachloroethene 5 ug/L 1.4 140 < 1.0 < 1.0 16 1.9 < 1.0 < 1.0 1.4 15 1.1 12 7.8 4.3 3.5 150 < 1.0 < 1.0 < 1.0 < 1.0 trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Trichloroethene 5 ug/L < 1.0 8.3 < 1.0 < 1.0 2.5 < 1.0 < 1.0 < 1.0 < 1.0 1.4 < 1.0 2.0 2.2 < 1.0 < 1.0 2.5 < 1.0 < 1.0 < 1.0 < 1.0 Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 1 of 5

Table 3 Summary of October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W25 W26 W27 W28 W29 W30 W32 W33 W33DUP W35 W36 W37 W38 W39 W40 W41R W42 W43 W44 W45 Date 10/16/2019 10/14/2019 10/10/2019 10/7/2019 10/7/2019 10/7/2019 10/8/2019 10/17/2019 10/17/2019 10/2/2019 10/2/2019 10/2/2019 10/4/2019 10/18/2019 10/15/2019 10/14/2019 10/22/2019 10/18/2019 10/14/2019 10/2/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L 10.1 < 5.00 < 5.00 < 5.00 < 5.00 7.57 7.17 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 8.93 < 5.00 < 5.00 < 5.00 4.37 Beta particles 50** pCi/L 7.27 12.5 5.10 8.26 7.67 20.8 175 7.78 5.81 < 5.00 < 5.00 < 5.00 < 5.00 8.84 < 5.00 14.3 < 5.00 < 5.00 < 5.00 16.6 Technetium99 900 pCi/L < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 49.7 321 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 0.026 J 0.199 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 0.0216 J Uranium238 ug/L 0.295 < 0.200 < 0.200 0.429 2.03 8.71 0.224 < 0.200 < 0.200 < 0.200 < 0.200 0.0936 J 0.183 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.983 Total Uranium 30 ug/L 0.295 < 0.200 < 0.200 0.429 2.05 8.91 0.224 < 0.200 < 0.200 < 0.200 < 0.200 0.0936 J 0.183 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 1 Chemical Fluoride 4 mg/L 0.126 1.42 3.97 5.45 4.8 8.06 3.66 0.152 0.136 0.025 0.007 0.02 0.176 0.024 0.166 0.03 1.99 0.111 0.023 0.633 Nitrate as N 10 mg/L 0.067 3.2 < 0.020 6.3 11 120 170 13 13 3.2 0.11 3.5 4.3 73 4.3 65 4.7 6.3 2.4 0.093 Ammonia mg/L 1.91 1.75 6.29 0.884 22.4 1.83 47.9 0.0134 0.0189 0.0075 0.0089 0.0088 0.0141 0.0218 0.0203 0.0299 0.806 0.0198 0.0186 2.08 Metals Antimony 6 ug/L 4.52 J 3.64 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 4.02 J < 20.0 < 20.0 < 20.0 3.87 J 4.6 J 8.79 J 8.02 J 6.21 J < 20.0 3.76 J < 20.0 8.1 J VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 cis1,2Dichloroethene 70 ug/L < 1.0 3.7 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 13 < 1.0 4.4 < 1.0 < 1.0 < 1.0 < 1.0 Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.4 300 330 2.6 < 1.0 < 1.0 1.8 290 < 1.0 190 < 1.0 < 1.0 < 1.0 < 1.0 trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 38 24 < 1.0 < 1.0 < 1.0 11 5.2 < 1.0 14 < 1.0 < 1.0 < 1.0 < 1.0 Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 2 of 5

Table 3 Summary of October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W46 W47 W48DUP W48 W49DUP W49 W50 W51 W52 W53 W54 W54DUP W55 W56 W57 W58 W59 W60 W61 W62 Date 10/21/2019 10/17/2019 10/21/2019 10/21/2019 10/24/2019 10/24/2019 10/15/2019 10/3/2019 10/3/2019 10/3/2019 10/4/2019 10/4/2019 10/4/2019 10/4/2019 10/3/2019 10/4/2019 10/5/2019 10/17/2019 10/17/2019 10/22/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 438 264 < 5.00 4.21 44.4 < 5.00 < 5.00 < 5.00 Beta particles 50** pCi/L 40.4 61.6 7.64 9.32 < 5.00 < 5.00 < 5.00 3.56 < 5.00 < 5.00 < 5.00 < 5.00 77.3 54.5 < 5.00 < 5.00 17.4 < 5.00 < 5.00 4.85 Technetium99 900 pCi/L 62.8 94.2 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 0.052 0.034 J < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 5.79 4.19 < 0.070 0.049 J 0.659 < 0.070 < 0.070 < 0.070 Uranium238 ug/L < 0.200 < 0.200 < 0.200 < 0.200 0.0865 J 0.0695 J 0.101 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 177 130 0.207 1.67 21.6 < 0.200 < 0.200 < 0.200 Total Uranium 30 ug/L < 0.200 < 0.200 < 0.200 < 0.200 0.0865 J 0.0695 J 0.101 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 183 134 0.207 1.72 22.2 < 0.200 < 0.200 < 0.200 Chemical Fluoride 4 mg/L 0.033 4.45 0.321 0.33 0.053 0.003 0.035 0.215 1.39 0.081 0.258 0.26 0.062 0.257 0.057 0.18 4.18 0.034 0.036 0.019 Nitrate as N 10 mg/L 7.8 42 4.9 5.3 < 0.020 < 0.020 < 0.020 0.11 1.3 0.57 2.8 2.8 3.7 4.2 4.6 9.7 14 0.035 2.5 4.0 Ammonia mg/L 0.0129 16.5 0.0422 0.0446 0.0097 0.0151 0.0185 0.256 0.0212 0.0397 0.0037 0.0125 0.0108 0.009 0.0155 18.6 12.3 0.0251 0.0274 0.0162 Metals Antimony 6 ug/L < 20.0 5.33 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 7.32 J < 20.0 4.12 J < 20.0 < 20.0 7.39 J 4.3 J 7.38 J 4.22 J < 20.0 5.44 J < 20.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 2.0 2.1 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Tetrachloroethene 5 ug/L 2.5 1.6 200 200 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 42 trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Trichloroethene 5 ug/L < 1.0 < 1.0 4.7 4.9 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 3 of 5

Table 3 Summary of October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W63 W64 W65 W66 W67 W68 W69 W70 W71 W72 W73 W74 W75 W76 W77 W78 W79 W80 W81 W82 Date 10/21/2019 10/17/2019 10/17/2019 10/17/2019 10/18/2019 10/22/2019 10/23/2019 10/23/2019 10/23/2019 10/4/2019 10/4/2019 10/9/2019 10/9/2019 10/5/2019 10/6/2019 10/5/2019 10/7/2019 10/6/2019 10/8/2019 10/8/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 865 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Beta particles 50** pCi/L < 5.00 70.3 7.14 < 5.00 65.3 < 5.00 < 5.00 < 5.00 8.11 < 5.00 < 5.00 < 5.00 < 5.00 6.88 111 < 5.00 5.90 7.29 < 5.00 4.82 Technetium99 900 pCi/L < 50.0 81.9 < 50.0 < 50.0 84.3 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 101 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 0.089 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 0.0308 J 10.1 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 Uranium238 ug/L 0.123 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.165 J 0.095 J 0.0831 J < 0.200 < 0.200 0.915 237 0.0933 J 0.0892 J 0.151 J 0.0728 J 0.151 J Total Uranium 30 ug/L 0.123 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.165 J 0.095 J 0.0831 J < 0.200 < 0.200 0.946 247 0.0933 J 0.0892 J 0.151 J 0.0728 J 0.151 J Chemical Fluoride 4 mg/L 0.259 4.27 0.783 0.076 0.01 0.02 0.022 <0.100 0.084 0.116 0.071 0.019 0.109 1.45 9.21 13.4 2.4 1.57 0.042 0.046 Nitrate as N 10 mg/L 0.34 42 0.64 1.5 14 3.0 0.16 1.4 0.021 1.5 2.0 4.9 0.063 9.8 12 3.5 4.0 8.3 3.1 0.99 Ammonia mg/L 0.023 16 0.0489 0.0336 1.31 0.0143 0.0341 0.0077 0.0149 0.275 0.0167 0.159 0.391 0.0154 7.11 0.0271 0.0146 0.0927 0.0762 0.0275 Metals Antimony 6 ug/L < 20.0 8.91 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 7.15 J 5.12 J 3.54 J 4.18 J 4.12 J 5.99 J 3.53 J 3.58 J 5.15 J 5.32 J < 20.0 7.19 J VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 13 22 1.5 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 1.9 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Tetrachloroethene 5 ug/L 1.0 1.3 220 480 49 110 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 19 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Trichloroethene 5 ug/L 1.1 < 1.0 84 8.5 8.4 1.8 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 4.5 < 1.0 63 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 4 of 5

Table 3 Summary of October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W83 W84 W85 W86 W87 W88 W89 W90 W92 W93 W94 W95 W96 W97 WSW01* WSW02* WSW03* WSW04*

Date 10/8/2019 10/8/2019 10/23/2019 10/23/2019 10/2/2019 10/22/2019 10/22/2019 10/22/2019 10/10/2019 10/6/2019 10/15/2019 10/15/2019 10/11/2019 10/11/2019 10/15/2019 10/22/2019 10/24/2019 10/24/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 3.06 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 3.63 7.11 Beta particles 50** pCi/L < 5.00 < 5.00 < 5.00 7.12 4.92 < 5.00 < 5.00 23.1 < 5.00 8.18 < 5.00 < 5.00 4.36 11.0 < 5.00 8.80 < 5.00 < 5.00 Technetium99 900 pCi/L < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 Uranium238 ug/L < 0.200 0.0704 J < 0.200 < 0.200 0.457 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.114 J < 0.200 < 0.200 0.272 < 0.200 0.776 0.482 Total Uranium 30 ug/L < 0.200 0.0704 J < 0.200 < 0.200 0.457 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.114 J < 0.200 < 0.200 0.272 < 0.200 0.776 0.482 Chemical Fluoride 4 mg/L 0.079 0.087 0.23 0.511 0.278 0.012 0.011 0.039 0.099 0.043 0.043 0.077 0.111 0.375 0.023 0.103 0.013 0.013 Nitrate as N 10 mg/L 0.76 < 0.020 0.039 < 0.020 0.055 4.5 2.5 2.3 0.029 5.3 < 0.020 0.024 0.054 3.4 0.020 < 0.020 < 0.020 0.067 Ammonia mg/L 0.0099 0.0119 0.03 0.0073 0.0127 0.0127 0.0132 0.0147 3.19 0.0324 0.246 0.145 0.228 4.89 0.0639 0.0273 0.0655 0.0166 Metals Antimony 6 ug/L < 20.0 < 20.0 6.48 J < 20.0 5.21 J < 20.0 < 20.0 < 20.0 < 20.0 4.77 J < 20.0 < 20.0 < 20.0 3.97 J < 20.0 5.89 J < 20.0 < 20.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 2.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 5.3 4.3 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 38 4.1 2.1 < 1.0 < 1.0 24 < 1.0 < 1.0 < 1.0 4.3 < 1.0 < 1.0 < 1.0 < 1.0 trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 11 < 1.0 < 1.0 < 1.0 < 1.0 2.8 < 1.0 < 1.0 < 1.0 1.2 < 1.0 < 1.0 < 1.0 < 1.0 Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 2.9 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Notes: DUP field duplicate sample MCL Maximum Contaminant Level

• private water supply well groundwater sample

• • sitespecific action level pCi/L picocuries per liter ug/L micrograms per liter mg/L milligrams per liter Bold concentrations indicate detections Concentrations in shaded cells exceed their MCL Page 5 of 5

Table 4 Summary of Surface Water Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SW11 SW12 SW13 SW14 SW16 SW17 SW17 (DUP) SW18 SW19 SW20 SW21 SW22 SW23 Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 Group Analyte MCL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 900 pCi/L < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 0.0682 J < 0.070 < 0.070 < 0.070 0.0174 J 0.0274 J < 0.070 < 0.070 < 0.070 Uranium238 ug/L 0.365 < 0.200 0.134 J 0.297 1.71 0.229 0.246 0.304 0.507 1.11 0.16 J 0.199 J 0.0673 J Total Uranium 30 ug/L 0.365 < 0.2 0.134 0.297 1.78 0.229 0.246 0.304 0.524 1.14 0.160 0.199 0.0673 Chemical Fluoride 4 mg/L 0.146 0.296 0.226 0.234 1.69 0.471 0.460 0.309 0.154 0.494 0.433 0.432 4.94 Nitrate as N 10 mg/L < 0.020 < 0.020 < 0.020 0.63 0.48 3.8 3.8 5.7 < 0.020 < 0.020 < 0.02 < 0.02 7.3 Ammonia mg/L 0.546 0.228 0.249 0.233 4.35 0.290 0.290 0.208 0.376 0.640 0.244 0.187 0.459 Metals Antimony 6 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 2Butanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 Acetone ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 16 16 14 < 1.0 < 1.0 <1 <1 < 1.0 trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 Notes: DUP field duplicate sample MCL Maximum Contaminant Level pCi/L picocuries per liter ug/L micrograms per liter mg/L milligrams per liter Bold concentrations indicate detections Concentrations in shaded cells exceed their MCL Page 1 of 1

Table 5 Summary of Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED11 SED12 SED13 SED14 SED15 SED16 SED17 SED17DUP SED18 SED19 SED20 SED21 SED22 SED23 SED24 SED25* SED26*

Depth 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/16/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 7/16/2019 7/18/2019 7/18/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89,400 pCi/g 0.00 # 0.00 # 0.00 # 0.0243 ## 5.62 ## 4.94 ## 7.50 ## 0.00 # 0.00 # 6.28 ## 0.00 # 4.12 ## 0.00 # 50.8 35.8 8.55 ## 1.68 ##

Uranium233/234 13 3,310 pCi/g 1.14 0.925 1.67 1.42 2.58 14.9 0.658 1.07 0.219 32.5 62.5 1.86 117 1.35 1.14 907 222 Uranium235/236 8 39 pCi/g 0.00159 ## 0.0647 ## 0.156 ## 0.025 ## 0.181 0.678 0.0235 ## 0.104 ## 0.0173 ## 2.30 3.12 0.104 ## 4.98 0.00261 ## 0.0608 ## 41.1 11.0 Uranium238 14 179 pCi/g 0.742 1.17 1.33 0.389 2.05 2.77 0.302 0.354 0.298 8.18 14.9 1.96 28.0 1.69 0.944 149 46.9 Chemical Fluoride mg/kg 1.35 J 2.26 J 1.45 J < 1.21 2.09 8.73 0.908 J 0.814 J < 1.22 3.51 15.7 2.17 J 4.64 38.1 49.2 53.3 4.61 Nitrate as N mg/kg 0.33 0.24 0.2 < 0.2 < 0.20 2.7 2.1 0.95 < 0.20 1.2 < 0.20 < 0.2 < 0.2 < 0.20 0.20 0.27 1.4 Ammonia mg/kg 723 560 98.5 6.43 49.0 13.5 4.15 3.66 3.48 401 1600 532 978 214 70.5 2270 167 Metals Antimony ug/kg < 5.29 < 4.93 <3 0.511 J < 2.42 0.447 J 0.482 J 0.512 J < 2.53 < 3.75 < 11.7 <6 < 6.26 < 2.87 < 2.94 5.01 J 1.22 J VOCs 1,1Dichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA 2Butanone ug/kg < 25 180 < 24 < 17 < 15 < 16 < 19 < 19 < 18 45 45 < 25 32 < 28 < 17 NA NA Acetone ug/kg 32 110 30 28 < 15 < 16 < 19 < 19 < 18 48 110 67 88 91 25 NA NA cis1,2Dichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA Tetrachloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 5.5 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA Toluene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA trans1,2Dichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA Trichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA Vinyl chloride ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA Page 1 of 4

Table 5 Summary of Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED27** SED28** SED29 SED29 SED29 SED30 SED30 SED31 SED31 SED32 SED32 SED33 SED33 SED33 SED34 SED34 SED35 Depth 0 6 in 0 6 in 0 6 in 6 12 in 12 16 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 12 16 in 0 6 in 6 12 in 0 6 in Date 7/18/2019 7/18/2019 11/20/2019 11/20/2019 11/20/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/22/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89,400 pCi/g 0.00 # 5.75 U 0.00 # 0.00 # 0.00 # 2.43 ## 0.00 # 0.959 ## 0.00 # 5.06 ## 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 0.00 #

Uranium233/234 13 3,310 pCi/g 225 254 6.23 1.81 1.23 5.71 1.41 2.81 2.96 3.71 10.0 5.06 1.27 1.06 3.13 2.93 2.26 Uranium235/236 8 39 pCi/g 11.9 12.4 0.313 0.208 0.175 0.191 0.0337 ## 0.0669 ## 0.110 ## 0.097 ## 0.469 0.394 0.0959 ## 0.0461 ## 0.131 ## 0.0487 ## 0.179 Uranium238 14 179 pCi/g 37.4 44.6 2.51 1.55 1.16 2.51 1.28 1.75 1.69 2.00 3.28 2.52 1.56 1.09 1.81 1.73 1.59 Chemical Fluoride mg/kg 171 39.3 1.14 J 2.56 2.61 2.26 3.43 3.13 3.07 3.88 4.21 1.57 J 1.56 6.63 2.20 4.26 2.09 Nitrate as N mg/kg 0.30 < 0.20 < 0.50 < 0.50 NA < 0.50 < 0.50 < 0.50 < 0.50 1.1 < 0.50 < 0.50 < 0.50 NA 0.62 < 0.50 < 0.50 Ammonia mg/kg 395 1560 455 287 230 394 392 286 118 480 576 248 117 67.3 397 336 158 Metals Antimony ug/kg 4.79 J 6.81 J < 4.85 < 3.53 < 2.97 < 4.08 < 4.41 < 28.4 < 25.6 < 4.15 < 3.44 < 35.6 < 30.3 < 2.73 < 3.59 < 32.8 < 29.9 VOCs 1,1Dichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 2Butanone ug/kg NA NA < 21 < 18 < 24 26 25 < 16 < 17 38 76 < 20 45 NA 28 28 < 18 Acetone ug/kg NA NA 410 420 370 380 530 410 440 450 440 490 400 NA 200 180 390 cis1,2Dichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 Tetrachloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 Toluene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 trans1,2Dichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 Trichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 Vinyl chloride ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 Page 2 of 4

Table 5 Summary of Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED35 SED36 SED36 SED37 SED37 SED37DUP SED38 SED39 SED40 SED41 SED42 SED43 SED44 SED45 SED46 SED47 Depth 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 6 12 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/26/2019 11/26/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89,400 pCi/g 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 16.5 ## 0.00 # 0.00 # 0.995 ## 5.94 ## 0.00 # 6.23 ## 2.83 ## 0.00 # 0.00 #

Uranium233/234 13 3,310 pCi/g 1.59 4.40 1.50 4.88 2.04 2.33 3.26 1.86 1.90 1.72 6.12 47.5 8.86 5.86 4.02 3.18 Uranium235/236 8 39 pCi/g 0.0433 ## 0.210 0.0881 0.254 0.149 0.0456 ## 0.204 0.0122 ## 0.131 0.0394 ## 0.285 2.32 0.377 0.268 0.179 0.232 Uranium238 14 179 pCi/g 1.66 2.38 1.05 1.78 1.62 1.38 1.68 1.70 1.24 1.41 2.23 12.1 2.62 2.20 2.15 1.46 Chemical Fluoride mg/kg 4.29 < 1.44 < 1.32 1.35 J 1.60 0.858 J 5.17 1.90 1.65 J 2.68 J 5.15 J 14.9 3.04 J 7.90 3.41 6.02 Nitrate as N mg/kg < 0.50 < 0.50 0.55 < 0.50 < 0.50 < 0.50 0.66 < 0.50 < 0.50 0.63 0.83 0.50 < 0.50 0.82 0.62 0.59 Ammonia mg/kg 80.1 153 99.1 451 127 178 576 222 242 466 928 774 389 586 371 1540 Metals Antimony ug/kg < 28 < 2.89 < 26.9 < 3.27 < 28.3 < 30 < 6.96 < 3.32 < 3.48 < 5.62 < 10.3 < 11.5 < 7.06 < 6.5 < 6.1 < 8.72 VOCs 1,1Dichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 2Butanone ug/kg < 17 < 18 < 20 < 20 < 18 < 18 < 24 < 19 < 21 < 26 < 27 < 29 < 29 29 < 26 160 Acetone ug/kg 310 370 350 300 350 360 400 < 19 260 96 59 79 57 130 110 410 cis1,2Dichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 Tetrachloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 Toluene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 trans1,2Dichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 Trichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 Vinyl chloride ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 Page 3 of 4

Table 5 Summary of Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED48 SED48DUP SED49 SED50 SED51 SED51 SED52 SED52 SED53 SED53 SED54 SED54 SED55 SED55 SED56 SED56DUP SED56 Depth 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 0 6 in 6 12 in Date 11/26/2019 11/26/2019 11/26/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89,400 pCi/g 0.00 # 0.00 # 0.00 # 0.910 ## 0.00 # 4.89 ## 0.00 # 0.00 # 0.00 # 0.00 # 1.51 ## 0.00 # 6.19 ## 0.00 # 2.53 ## 0.00 # 0.00 #

Uranium233/234 13 3,310 pCi/g 2.57 2.43 4.59 3.64 2.10 1.27 1.77 1.88 2.15 2.06 1.78 1.48 2.05 1.62 2.02 2.82 1.89 Uranium235/236 8 39 pCi/g 0.091 ## 0.0144 ## 0.215 0.104 ## 0.178 ## 0.0695 ## 0.308 ## 0.0494 ## 0.194 0.0708 ## 0.119 ## 0.120 ## 0.00 # 0.155 0.214 0.115 ## 0.0276 ##

Uranium238 14 179 pCi/g 1.98 1.62 2.11 1.86 1.42 1.15 1.72 1.45 1.45 2.34 1.36 1.87 1.74 1.62 1.40 2.11 1.72 Chemical Fluoride mg/kg 2.94 3.46 5.44 4.67 2.77 J 2.96 1.48 J 1.69 J 0.838 J 0.607 J 1.93 J 1.01 J < 1.88 < 1.76 < 1.89 < 1.96 0.690 J Nitrate as N mg/kg 0.63 0.70 0.58 0.53 0.72 0.51 < 0.50 0.61 < 0.50 < 0.50 0.63 0.68 < 0.50 < 0.50 0.52 0.74 < 0.50 Ammonia mg/kg 806 1080 209 750 692 401 465 271 387 196 854 536 321 223 449 325 244 Metals Antimony ug/kg < 5.01 < 5.68 < 7.62 < 6.52 < 5.8 < 5.66 < 4.58 < 4.27 < 3.46 < 31.3 < 7.44 < 5.3 < 3.66 < 3.04 < 3.6 < 3.47 < 3.26 VOCs 1,1Dichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 2Butanone ug/kg 39 23 < 28 190 43 < 27 31 < 26 < 22 < 21 42 < 25 < 19 < 20 < 21 < 19 < 14 Acetone ug/kg 220 280 300 370 330 180 100 < 26 < 22 170 330 39 < 19 200 220 23 < 14 cis1,2Dichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 Tetrachloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 Toluene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 8.7 < 6.7 10 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 trans1,2Dichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 Trichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 Vinyl chloride ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 Notes: RUSL Residential Use Screening Level (NUREG 1757, Appendix H)

IUSL Industrial Use Screening Level (NUREG 1757, Appendix H)

DUP field duplicate sample

• Sludge sample collected from the Sanitary Lagoon

• • Sludge sample collected from the East Lagoon

1. value is reported as a negative number

1. 1. value is below minimum detectable concentration pCi/g picocuires per gram mg/kg milligrams per kilogram ug/kg micrograms per kilogram Bold concentrations indicate detections Concentrations in shaded cells exceed their RUSL/IUSL NA not analyzed VOCs volatile organic compounds Page 4 of 4

Table 6 Soil Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample Depth Result Sample ID Collection Date (feet bgs) (pCi/g)

Residential Use Screening Level 19 Industrial Use Screening Level 89,400 SS1 01 8/15/19 0.171 #

SS1 13 8/15/19 4.39 #

SS1 35 8/15/19 0.00 ##

SS1 57 8/15/19 0.00 ##

SS2 01 8/14/19 0.00 ##

SS2 13 8/14/19 9.60 #

SS2 35 8/14/19 4.78 #

SS2 57 8/14/19 4.02 #

SS3 01 8/14/19 12.9 #

SS3 13 8/14/19 4.83 #

SS3 35 8/14/19 0.00 ##

SS3 57 8/14/19 3.12 #

SS3DUP 57 8/14/19 1.35 #

SS4 01 8/14/19 2.35 #

SS4 13 8/14/19 16.1 #

SS4 35 8/14/19 7.72 #

SS4 57 8/14/19 0.00 ##

SS5 01 8/14/19 0.637 #

SS5 13 8/14/19 0.00 ##

SS5 35 8/14/19 4.46 #

SS5 57 8/14/19 0.843 #

SS6 01 8/14/19 7.58 #

SS6 13 8/14/19 0.00 ##

SS6 35 8/14/19 0.00 ##

SS6 57 8/14/19 0.00 ##

SS7 01 8/13/19 8.60 #

SS7 13 8/13/19 0.00 ##

SS7 35 8/13/19 0.00 ##

SS7 57 8/13/19 0.00 ##

SS8 01 8/13/19 0.00 ##

SS8 13 8/13/19 5.52 #

SS8 35 8/13/19 1.09 #

SS8 57 8/13/19 0.00 ##

SS9 01 8/13/19 0.00 ##

SS9 13 8/13/19 0.00 ##

SS9 35 8/13/19 0.572 #

SS9 57 8/13/19 18.1 #

SS10 01 8/13/19 0.00 ##

SS10 13 8/13/19 0.00 ##

SS10 35 8/13/19 0.00 ##

SS10 57 8/13/19 0.00 ##

SS11 01 8/12/19 9.64 #

SS11 13 8/12/19 0.00 ##

SS11 35 8/12/19 14.3 #

SS11 57 8/12/19 17.3 #

Page 1 of 2

Table 6 Soil Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample Depth Result Sample ID Collection Date (feet bgs) (pCi/g)

Residential Use Screening Level 19 Industrial Use Screening Level 89,400 SS12 01 8/12/19 8.88 #

SS12 13 8/12/19 8.02 #

SS12 35 8/12/19 10.0 #

SS12 57 8/12/19 6.76 #

SS13 01 8/12/19 5.42 #

SS13 13 8/12/19 11.0 #

SS13 35 8/12/19 2.05 #

SS13 57 8/12/19 3.31 #

SS13DUP 57 8/12/19 21.6 #

SS14 01 8/13/19 4.80 #

SS14 13 8/13/19 1.57 #

SS14 35 8/13/19 4.99 #

SS14 57 8/13/19 0.00 ##

SS14DUP 57 8/13/19 9.42 #

Notes:

bgs below ground surface pCi/g picocuries per gram

1. value is below minimum detectible concentration

1. 1. value is reported as a negative number DUP field duplicate sample Concentrations in shaded cells exceed their RUSL/IUSL Page 2 of 2

Table 7 Summary of Hydraulic Characteristic Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well Hydraulic Conductivity (K) Average Hydraulic Cond. (K)

Test Type Number cm/sec ft/day cm/sec ft/day F 3.46E03 9.80 W13R* 3.51E03 9.95 R 3.56E03 10.09 F 1.96E03 5.56 W15* 1.96E03 5.55 R 1.95E03 5.53 F 1.17E03 3.33 W39* 1.08E03 3.06 R 9.80E04 2.78 F 2.12E04 0.60 W48* 1.97E04 0.56 R 1.83E04 0.52 F 4.71E02 133.70 W60* 4.41E02 125.20 R 4.11E02 116.70 F 1.79E03 5.09 W61* 1.81E03 5.12 R 1.82E03 5.15 F 1.65E03 4.67 W94 1.87E03 5.31 R 2.09E03 5.94 F 2.11E02 59.84 W95 1.51E02 42.95 R 9.19E03 26.05 F 1.45E02 41.19 W96 2.07E02 58.58 R 2.68E02 75.97 F 2.75E02 78.00 W97 2.84E02 80.45 R 2.92E02 82.89 Average Conductivity Floodplain Aquifer 1.65E02 46.82 Notes:

F Falling Head Test R Rising Head Test cm/sec centimeters per second ft/day feet per day

• slug tests conducted during a previous phase of work in upper and lower surficial aquifer wells but not previously reported Page 1 of 1

Table 8 Summary of Private Water Supply Well Survey Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Map ID Address/Designation Latitude Longitude Richland County Tax Map ID #

1 150 Hopkins Park Road R214000111 2 7028 Lower Richland Blvd R214000127 3 7040 Lower Richland Blvd R214000139 4 7048 Lower Richland Blvd R214000116 5 7064 Lower Richland Blvd R214000130 6 7071 Lower Richland Blvd R214000265 7 7072 Lower Richland Blvd R214000117 8 7131 Lower Richland Blvd R214000261 9 7152 Lower Richland Blvd R214000124 10 5943 Bluff Road R214000309 11 6001 Bluff Road R214000302 12 6041 Bluff Road R214000305 13 6045 Bluff Road R214000306 14 1012 Coley Road R187050105 15 1109 Coley Road R188000218B Page 1 of 2

Table 8 Summary of Private Water Supply Well Survey Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Map ID Address/Designation Latitude Longitude Richland County Tax Map ID #

16 1113 Coley Road R187000304 17 1122 Coley Road R187050108 18 1243 Coley Road R187060202 19 1249 Coley Road R187060203 20 1249 Coley Road R187060204 21 109 Nicie Byrd Way R188000219 22 117 Nicie Byrd Way R188000250 23 125 Nicie Byrd Way R188000249 24 133 Nicie Byrd Way R188000248 25 100 Pincushion Road R187000409 26 WSW01 33.8892625 80.93917313 R159000106 27 IWSW01 33.88717942 80.92577294 R159000106 28 IWSW02 33.88875406 80.92383756 R159000106 31 WSW02 33.85836279 80.9297476 R185000102 29 WSW03 33.87559353 80.94351638 R157000101 30 WSW04 33.84324651 80.93413056 R156000102 Page 2 of 2

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Figures AECOM

Legend Locations Property Line SCRDI Bluff Road (Superfund Site)

Topographic Quadrangle Boundary ID Topographic Quadrangle Name 1 Southwest Columbia 2 Gaston 3 Fort Jackson South 4 Saylors Lake 5 Congaree 6 Gadsden Dominion Energy Substation 1 CFFF 3 5 2

q 0 2,000 4,000 Feet 1:48,000 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 Data Source: Esri/USGS

^ 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Site Location Map WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA 4 6 PROJECT NO. PREPARED BY: DATE:

60595649 CCS February 2020 FIGURE 1 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_1_sitelocationmap.mxd

?

Legend W-24 Dominion Energy Substation A  ?  ? Ditch

?

Culvert Culvert Mill Creek Flow Direction

?  ? EL East Lagoon

?  ?? Eastern Ditch NL North Lagoon

?  ?

?  ? SL South Lagoon

?  ? SAN Sanitary Lagoon Former Oil House WL1 West Lagoon I

?

WL2 West Lagoon II

? Western Ditch  ?

W-69 Groundwater Monitoring Wells W-89 Middle Ditch W-36

?

W-70 @

A A Upper Surficial Aquifer W-88 @

A @

A W-71 @

A  ?

? @

A @

A Lower Surficial Aquifer

? Plant  ?

Black Mingo Aquifer W-43 Building W-19B @

A A @

A @

A@

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A WL2 @

A A@@

A  ? @

A Upper Floodplain Well A @ A W-60 A

A @

A W-61 @

A Lower Floodplain Well W-39 A @

A@@

A A

W-86 A

W-90 A  ?

A A W-91 @

A@

A @

A @

A A W-85 WL1 @ @

A A @ Mill Creek W-44 W-33 A@

A @

A A W-41R @

A @

A @

A @

A W-62 ARW-2R @

A NL A@

A

@ Property Line A  ? SAN A A SL A W-36 SCRDI Bluff Road (Superfund Site)

A  ?

?  ?  ? EL @

A @

A  ?  ?

W-46 @

A @ @

A W-42 A @

A @ A@A  ?

W-23R Dike Location W-68@

A W-10 W-7A @

A A

A A @ Staff Gauge Location W-63 A

@ W-26 @

A W-11 W-32 W-13R W-14 )

A A @

A A @

A @

A W-49 W-48 @ W-15 W-87 Top of Bluff Gator @

A W-16 @

A W-67 W-64 @

A )"  ?  ?

A Inferred Top of Bluff A

A Gator W-47 Pond  ? W-97  ?

Upper Sunset @

A Bottom of Bluff

?

W-27 @

A A @

A A W-4  ?

Lake Inferred Bottom of Bluff

? @ W-94 W-92 W-3A  ?

A Upper Plant Secondary Bluff Area

)

" Building A W-95 Lower Sunset W-43@

A W-96 W-35 RW-1 Lake @

A @

A  ?

Upper Sunset @

A W-45 W-65

? Dike WL2 W-40 @

A A ?

A @

A  ?

A W-20 Lower A W-51 W-66 A W-50

) @

A W-52 q

)Creek

" 0 300 600

?

? Lower Sunset @

A W-53 Feet W-39 W-72 Dike A W-54 A @

1:7,200 A  ? @

A W-37 W-55 @

A Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet W-84

@ W-56 W-73

? A Datum:W-86 North @

American

@ A A 1983 W-74 @

A W-57 W-79 @

A  ?

A A

A @

Mill W-33 WL1 W-58 W-38 A

W-75 A@

@A W-93 Creek @

A W-59 @

A W-76 W-77 101 Research Drive A @

A Columbia, SC 29203 W-29 @

A @ AW-78 W-83 T: (803) 254-4400 F: (803) 771-6676 A W-28 W-80

? W-30 A  ?

SAN  ? NL @

A @

A W-81 W-82 Site Map

? @

A @

A W-17 SL EL WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY W-25 HOPKINS, SOUTH CAROLINA A @

A W-18R A W-22 @ W-6 AA

@ PROJECT NO. PREPARED BY: DATE:

?  ?  ?  ? 60595649 CCS June 2020 FIGURE 2 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_2_SiteMap.mxd W-7A A

?

W -

24 Legend 130.16' Groundwater Monitoring Wells A Upper Surficial Aquifer A Lower Surficial Aquifer A Black Mingo Aquifer A Upper Floodplain Well A Lower Floodplain Well Mill Creek W -

69 Property Line W -89 W -

36 130.89' W -70 120.72' 127.63' (126.

12'

)

W -88 SCRDI Bluff Road (Superfund Site)

(119.68'

)

0 13 Culvert

? Ditch W -19B W -43 (117.68'

) W -60 (125.

68'

) Mill Creek Flow Direction (118.

08'

)

Dike Location W -

61 W -

39 W -86 W -90 121.64' 124.90' (118.

18'

)

(115.

95'

) "

) Staff Gauge Location W -85 W -

91 W -44 W -33 (116.

44'

) 12 (116.

68'

) Top of Bluff 115.25' (123.

48'

)

W -

41R 5 117.87' Inferred Top of Bluff W -62 W -RW 2 (114.

79'

) (121.31'

) Bottom of Bluff W -68 W -42 1 15 W -46 W -

23R (108.

63'

) 114.64' 120. 72' W -7A 121.28' Inferred Bottom of Bluff W -10 122. 71' W -13R W -63 W -14 120.31' 32 123. 17' 20 Secondary Bluff Area (113.71') W -11 W - 120.14'1 121.02' W -48 W -26 ( 121.74') EL East Lagoon 115.84 W -

67 W -87 (115.

35')W -64 W - 16 115.72' (127.

46'

)

NL North Lagoon 115.50' 1 21 .

31 '

W -15 Upper Suns et W -

(

47 114.91')

115.00' Gator

(

117. 16' )1 10 W -

97 SL South Lagoon Lak e W -94 109.50 (105.

90'

)

W -27 W -4 SAN Sanitary Lagoon 110. 59' W - 92 (105. 71')

Upper (105.56') WL1 West Lagoon I (109.

01') Plant W -95 Building W -

96 WL2 West Lagoon II (105.

69'

)

Low er Suns et 105.38' W -

35 Potentiometric Line (C.I. = 5 Lak e 127.29' W -RW 1 Upper Suns et W -65 (127.31') feet, dashed where inferred)

Di ke W -

45 (126.

88'

) W -

40 Direction of Groundwater WL2 127.31' W -

51 127.17' W -

20 Low er W -

66 127.24' 124.90' Groundwater Elevation 105.56' (108.65'

) 127.19' W -

52 (127.46') Elevation for illustrative purposes only W -

53 127.04' q

Low er Suns et 127.12' Cr eek Based upon data from October 14, 2019

(

105. 69'

) W -54 Di ke W -

72 127.05' 126.99' W -

37 0 300 600 126.99' W - 56 W -

55 Feet 126. 93' W -84 1:7,200 126.91' W -74 W - 73 127.54' (126.47'

) 126. 84' W - 57 W -93 W -79 Map Projection: North American Datum (NAD) 1983, 126. 76' Mi ll WL1 W -75 126.79' W -58 125. 74' W -38 (126.07') 127. 06' South Carolina State Plane, FIPS 3900, Feet Cr eek 126.06' W -77 W - 59 126. 55' 101 Research Drive 125. 65' W -

78 Columbia, SC 29203 W -

76 T: (803) 254-4400 F: (803) 771-6676 W -

29 126.26' W -

83 127.57' W -

28 126.20' 121.86' 126.28' Potenti om etr i cMap- Upper W -

80 SAN NL W -30 124.79' Sur f ici al/Upper Floodplai nAq ui fers 10 126. 16' 5 W -

81 124.41' W -

25 SL EL W -82 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY 104.93' W -17 W -18R W -22 123.51' HOPKINS, SOUTH CAROLINA W -6 (124.

71'

) (124. 51'

) 124. 83' (125.24') PROJECT NO. PREPARED BY: DATE:

60595649 RGM June 2020 FI GURE3 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_3_Pot-Oct2019_rev20200624.mxd

Legend A Black Mingo Aquifer Monitoring Well Location 114.74' Groundwater Elevation Potentiometric Line (C.I. = 2 feet)

Direction of Groundwater Flow

? Ditch Culvert 114.74' Groundwater Elevation EL East Lagoon NL North Lagoon SL South Lagoon SAN Sanitary Lagoon WL1 West Lagoon 1 WL2 West Lagoon 2 Plan Build t ing WL2 W-71 Note:

W-50

@ 114.74 A

Based upon data collected on October 14, 2019 A 114.31 114 WL1 q

SAN NL W-49 109.18'A

@ 110 SL EL 112 Upper Sunset Lake Gator Pond W-3A 111.29' A

0 250 500 er Feet Lo w 1:6,000 Su n t Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet se La ke Datum: North American 1983 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Potentiometric Map - Black Mingo Aquifer WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA PROJECT NO. PREPARED BY: DATE:

60595649 LJG June 2020 FIGURE 4 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_4_BlackMingo_Pot-Oct2019.mxd

?

Legend

?  ?

??  !

( Lithologic Boring Locations

?  ? Ditch

?  ? Culvert

?  ? Mill Creek Flow Direction

?

Dike Location

? Mill Creek

? Property Line

? Top of Bluff Inferred Top of Bluff

?  ?

Bottom of Bluff

?

L-12 Inferred Bottom of Bluff

( Secondary Bluff Area L-16 Plant East Lagoon

? EL

( Building L-15

?

NL North Lagoon WL2

(

L-14  ? SL South Lagoon

( L-11  ? SAN Sanitary Lagoon L-13

( West Lagoon 1 WL1

?

( WL1 WL2 West Lagoon 2

?

? SAN NL

?  ? SL EL

?  ?

?

r  ?

Gato L-9 L-10  ?

Pond L-19?  ?  ?

L-2  !

(  !

(

r

(

Uppe ake  !

(

L-17 n setL L-3 Su  !

( Lo

?  !

( L-4 we r Su L-1 n se

( t L-8 L-18 La

( ke L-7

(

(  !

(  ?

? Upper Sunset Lake Dike Lower Sunset Lake Dike L-5 L-6 0 250 500 q

(  !

(  ? Feet 1:6,000

? Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet

? Datum: North American 1983 Mill  ? 101 Research Drive Creek Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Lithologic Boring Locations WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA

? PROJECT NO. PREPARED BY: DATE:

60595649 LJG June 2020 FIGURE 5 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_5_LithologicBoringLocations.mxd

Legend A Upper Surficial Aquifer Monitoring Well Location A Upper Floodplain Aquifer Monitoring Well Location

? Ditch Culvert W-89 Dike Location

@ 2.

A 1 Mill Creek Mill Creek Flow Direction Top of Bluff Inferred Top of Bluff 1 Bottom of Bluff W-36 Inferred Bottom of Bluff W-91 NS

@<1.

A 0 Secondary Bluff Area A PCE Isoconcentration Contour (µg/L)

W-43

@<1.

A 0 1 PCE Inferred Isoconcentration Contour (µg/L) 5 W-35 Plan 2.6 Build t PCE Isoconcentration Contour at a Concentration W- 61@

A ing

<1. 0 W-45 Less Than the Maximum Contaminant Level (µg/L)

@ W-69 WL2 W- 66 @

A <1.0 A <1.

0 W-40 480 A @ A W- 51 W-39 @ <1 .

0 @

A 480 PCE Concentration in µg/L

<1. 0

@290 A @

A W- 52 W- 53 A NS Not Sampled

@ <1. 0 W-72 <1. 0A

<1.0

@ W-54 W-37

< 1.

0 EL East Lagoon

@A A 56<1. 0 W-41R W-55 A

@ W-A@

<1. 0 NL North Lagoon

@190 <1.0 WL1 A @ W- 57 W- 58 W- 75 A @A A

<1. 0

@W-73 @ <1.

A 0 <1. 0 SL South Lagoon

<1.0 W- 38 W-59 @

A@ W-76 1.

A W-79 8 W-84

@ <1.0 A SAN Sanitary Lagoon W-46 SAN <1. 0 A <1.0 A

A W- 77 @<1.

A 0 W-86

@2.

A 5 W- 29 NL @A A @

A <1. 0 <1.0 WL1 West Lagoon 1 W- 42 <1. 0 W- 30 W-28 @

@<1. 0 A 80 W- 78 W- @

0 <1.0 83 A W- A W- 18R SL <1.

WL2 West Lagoon 2 EL @<1.

A 0 <1. 0 <1. 0 3.5 W-22 W-7A @

A W-81 A Note:

W-10 <1.0 @

A W- 82 W-26 @<1.

A 0 @1.

A 9 <1.0 @<1.

A 0 Based upon data collected in October 2019

@<1.

A 0 q

W- 32 W- 11 1.4A W-64 W-15

@A@1. 1 5 W-23R 1.3A W-13R @ <1.

@ @12 A W-16 W- 14 A 0

@15 A

@7.

A 8 @ 1.

A 1 1

UpperSu nset Gator W- 67 Lake W-27 Pond @ 49 A

<1.0 A W-4

@ <1.

A 0 W- 97 UpperSu nset @

A 4.3 Dike 0 200 400 Feet 1:4,800 LowerSu nset Map Projection: NAD 1983, South Carolina State Plane, Lake FIPS 3900, Feet W- 96 W-20 @

A <1.0 Datum: North American 1983 A <1.

0 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 LowerSu nset Extent ofPCE- UpperAqu i fer s Di ke Mi ll WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA Cr eek PROJECT NO.

60595649 PREPARED BY:

RGM DATE:

June 2020 FI GURE6 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_6_PCE_UpperSurf_Oct2019.mxd

Legend 1 @

A Lower Surficial Aquifer Monitoring Well Location A Lower Floodplain Aquifer Monitoring Well Location W-88  ? Ditch 4.

1 Culvert Dike Location Mill Creek Flow Direction 5 Mill Creek W-19B Top of Bluff 150 Inferred Top of Bluff W-90

<1.0 W-87 Bottom of Bluff 38 5

W-60 5 Inferred Bottom of Bluff

<1.0 Secondary Bluff Area Plan W-71 W-65 Build t <1.

0 PCE Isoconcentration Contour (µg/L)

WL2 220 W-RW1 ing 1.

4 PCE Inferred Isoconcentration Contour (µg/L)

W-44 PCE Isoconcentration Contour at a Concentration

<1.0 Less Than the Maximum Contaminant Level (µg/L)

W-62 1 42 W-33 1 300 PCE Concentration in µg/L W-68 W-RW2 300 WL1 W-74 EL East Lagoon 110 140 19 NL North Lagoon SAN W-93 W-85 SL South Lagoon W-63 NL 24 <1.

0 SAN Sanitary Lagoon 1.

0 W-17 4.

3 SL WL1 West Lagoon 1 EL W-18R 5 W-48 3.

15 W-6 WL2 West Lagoon 2 16 q

200 5

W-94

<1.

0 1 UpperSu nset W-47 1.

6 Lake Gator Pond W-95 W-92

<1.

0 5 <1.0 UpperSu nset Note:

Dike Based upon data collected in October 2019 0 200 400 LowerSu nset Feet Lake 1:4,800 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 101 Research Drive LowerSu nset Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Dike Mill Creek Extent ofPCE- LowerAqu i fer s

WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA FI GURE7 PROJECT NO. PREPARED BY: DATE:

60595649 RGM June 2020 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_7_PCE_LowerSurf_Oct2019.mxd

Legend A Upper Surficial Aquifer Monitoring Well Location A Upper Floodplain Aquifer Monitoring Well Location

? Ditch Culvert Dike Location W-89

<1.0 Mill Creek Flow Direction Mill Creek Top of Bluff Inferred Top of Bluff Bottom of Bluff Inferred Bottom of Bluff W-36 Secondary Bluff Area

<1.0 W-90 TCE Isoconcentration Contour (ug/L)

NS W-43 TCE Inferred Isoconcentration Contour (ug/L)

<1.0 TCE Isoconcentration Contour at a Concentration Less Than the Maximum Contaminant Level (ug/L)

W-61 1 Plan

<1.0 WL2 W-35 Build t W-40 <1.0 ing W-69 5 W- 66 <1.0 W-45 <1.0 63 TCE Concentration in µg/L

<1.0W- 51 W-39 8.5 <1.0 EL East Lagoon 5.

2 W-72 W-53 W-52

<1.0 < 1.

0 W-54 <1.0 NL North Lagoon W- 55 <1.0 W- 37 W-73 <1.0 SL South Lagoon W-41R <1. 0 W-56 WL1 <1.0 Sanitary Lagoon 14 <1.0 W-57 SAN W-75 W-58 <1.0 W-79 W-38 West Lagoon 1

<1. 0 W- <1.0 <1.0 WL1 59 11 SAN W-76 W-77

<1.0 W-84 WL2 West Lagoon 2 W-46 W-29 <1.0 W-86 NL 63 W-78 <1.0

<1.0 <1.0 <1.0 Note:

W-42 W- 30 5 <1.0

<1. 0 W-83

<1.0 SL 1 W-80 Based upon data collected in October 2019 EL <1.0 <1.0 W-22 W-28 W- 81 q

W- 7A <1 .

0 <1.0 <1.

W-10 0 W-82 W-26 <1.0 <1. 0 <1.0

<1.0 W-32

<1.0 W-11

<1.0 W-64 W-23R W-15 W-13R

<1.0 <1.0 2.

0 W-16 1.

4 W-14 1 2.

2 <1.0 Gator UpperSu nset Pond W-67 Lake W-27 8.

4

<1.0 W-4 5

<1.

0 W-97 UpperSu nset 1.

2 Dike 0 200 400 Feet 1:4,800 LowerSu nset Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet W-20 Lake W-96 Datum: North American 1983

<1.

0 <1.

0 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 LowerSu nset Extent ofTCE- UpperAqu i fer s

Dike WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY Mill HOPKINS, SOUTH CAROLINA Creek PROJECT NO.

60595649 PREPARED BY:

RGM DATE:

June 2020 FI GURE8 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_8_TCE_UpperSurf_Oct2019.mxd

Legend A Lower Surficial Aquifer Monitoring Well Location A Lower Floodplain Aquifer Monitoring Well Location

? Ditch Culvert Mill Creek Flow Direction W-88

<1.0 Mill Creek Top of Bluff Inferred Top of Bluff Bottom of Bluff Inferred Bottom of Bluff W-19B 2.

5 Secondary Bluff Area TCE Isoconcentration Contour (ug/L)

W-90 TCE Inferred Isoconcentration Contour (ug/L)

<1.0 W-87 11 TCE Inferred Isoconcentration Contour at a W-60 Concentration Less Than the Maximum

<1.0 Contamminant Level (ug/L)

Plan t

WL2 W-RW1Building W-65 W-70

<1.0 84 TCE Concentration in µg/L 84 <1.0 W-44 EL East Lagoon

<1.0 1 NL North Lagoon W-62

<1.0 SL South Lagoon W-33 W-68 38 WL1 W-74 1 SAN Sanitary Lagoon W-RW2 4.

5 1.

8 8.

3 WL1 West Lagoon 1 1 SAN W-93 WL2 West Lagoon 2 W-63 NL 2.

8 1.

1 W-17 W-85 Note:

SL <1.0

<1.0 W-6 EL Based upon data collected in October 2019 5 2.

5 W-48 1

q 4.

9 W-18R

<1.0 W-94

<1.

0 Upper W-47

<1.0 Gator Sunset Lake Pond W-95 W-92

<1.

0 <1.0 wer Lo Su n 0 200 400 se t Feet La ke 1:4,800 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Ext entofTCE-LowerAquif ers WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA PROJECT NO. PREPARED BY: DATE:

60595649 RGM June 2020 FI GURE9 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_9_TCE_LowerSurf_Oct2019.mxd

Legend A Upper Surficial Aquifer Monitoring Well Location A Lower Surficial Aquifer Monitoring Well Location A Black Mingo Aquifer Monitoring Well Location A Upper Floodplain Aquifer Monitoring Well Location W-89 @

A Lower Floodplain Aquifer Monitoring Well Location 2.5 W-88  ? Ditch 4.5 Culvert Dike Location Mill Creek Flow Direction Mill Creek W-19B 3.8 Top of Bluff W-36 Inferred Top of Bluff 0.11 Bottom of Bluff W-90 W-91 W-87 2.3 Inferred Bottom of Bluff NS 0.055 W-43 W-60 6.3 Secondary Bluff Area 0.035 W-40 W-65 W-35 4.3 Pla 3.2 W-RW1 Bu nt 0.64 W-71 Nitrate Isoconcentration Contour (mg/L)

W-61 WL2 ilding 0.021 W-69 W-66 2.1 0.16 Nitrate Inferred Isoconcentration Contour (mg/L) 2.5 W-70 1.5 W-45 Nitrate Isoconcentration Contour at a Concentration 10 W-39 W-50 0.093 W-51 1.4 1

W-44 0.11 W-52 Less Than the Maximum Contaminant Level (mg/L) 2.4 73 < 0.020 W-72 W-53 1.3 W-62 W-56 1.5 0.57 W-54 770 Nitrate Concentration in mg/L 4.0 4.2 2.8 W-33 W-37 W-41R WL1 W-74 W-73 NS Not Sampled 13 2.0 W-55 3.5 W-68 65 W-RW2 4.9 W-57 3.7 East Lagoon 3.0 20 W-75 4.6 W-38 EL W-58 4.3 W-93 0.063 NL North Lagoon W-59 9.7 W-77 5.3 W-79 SAN W-76 12 W-84 W-49 W-46 W-2914 9.8 4.0

< 0.020 W-85 SL South Lagoon W-63 < 0.020 7.8 11 NL W-30 W-78 0.039 W-42 W-17 3.5 0.34 W-18R S 120 W-28 W-83 SAN Sanitary Lagoon 4.7 16 L W-80 W-86 770 EL 6.3 0.76 8.3 < 0.020 WL1 West Lagoon 1 W-10 W-81 W-48 W-22 W-6 37 3.1 W-82 5.3 W-7A 100 210 WL2 West Lagoon 2 W-26 0.99 3.2 390 W-11 1 W-94 W-32 W-64 56

< 0.020 170 W-23R W-15 q

42 W-13R Note:

35 0.71 W-16 18 W-14 W-47 3.2 0.061 Based upon data collected in October 2019 42 Gator Upper Sunset Pond 10 W-67 W-95 Lake W-27 W-92 0.029 14 0.024 < 0.020 W-4 W-3A 0.023

< 0.020 W-97 0.2 Upper Sunset 3.4 0

Dike 1 0 200 400 Feet 1:4,800 Lower Sunset Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet W-20 Lake W-96 Datum: North American 1983

< 0.020 0.054 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Nitrate in Groundwater Lower Sunset Dike WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY Mill HOPKINS, SOUTH CAROLINA Creek PROJECT NO.

60595649 PREPARED BY:

LJG DATE:

June 2020 FIGURE 10 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_10_Nitrate_Oct2019.mxd

Legend A Upper Surficial Aquifer Monitoring Well Location A Lower Surficial Aquifer Monitoring Well Location A Black Mingo Aquifer Monitoring Well Location A Upper Floodplain Aquifer Monitoring Well Location W-89 0.011 @

A Lower Floodplain Aquifer Monitoring Well Location W-88  ? Ditch 0.012 Culvert Dike Location Mill Creek Flow Direction W-19B Mill Creek 0.019 W-36 Top of Bluff 0.007 Inferred Top of Bluff W-90 0.039 W-91 W-87 Bottom of Bluff NS W-43 0.278 W-60 W-35 0.034 0.111 W-40 Inferred Bottom of Bluff 0.025 W-65 0.166 W-RW1 Plant W-70 0.783 0.055 Building < 0.100 Secondary Bluff Area W-61 WL2 W-45 0.036 W-66 0.633 W-51 W-71 W-69 Fluoride Isoconcentration Contour 0.076 0.215 0.084 0.022 (mg/L)

W-39 W-52 W-44 W-50 0.024 W-53 1.39 Fluoride Isoconcentration Contour at a Concentration 0.023 0.035 W-54 W-37 0.081 0.02 Less Than the Maximum Contaminant Level (mg/L)

W-62 W-720.258 0.019 0.116 W-55 Fluoride Inferred Isoconcentration Contour (mg/L)

W-33 W-73 0.062 W-56 W-41R 0.152 WL1 W-74 0.071 W-68 0.03 0.019 W-57 0.257 Fluoride Isoconcentration Contour Depression (mg/L) 0.02 W-RW2 0.057 W-38 W-75 W-58 0.099 0.109 0.176 0.18 W-59 W-93 W-79 SAN W-29 2.4 W-84 13.4 Fluoride Concentration in mg/L W-46 W-76 4.18 0.043 4.8 W-77 0.087 W-63 0.033 1 NL 1.45 W-78 9.21 W-86 0.511 NS Not Sampled W-49 W-42 W-17 W-30 13.4 0.259 0.003 1.99 2.22 W-18R SL 8.06 W-80 W-83 W-85 EL East Lagoon 6.34 EL 1.57 0.079 0.23 W-28 W-81 NL North Lagoon W-48 W-10 W-7A W-6 5.45 0.042 W-82 0.33 W-26 3.32 6.47 W-22 0.126 0.046 SL South Lagoon 1.42 5.52 SAN Sanitary Lagoon 4

W-11 W-32 W-94 0.021 3.66 W-64 WL1 West Lagoon 1 0.043 W-23R 4.27 W-15 W-13R W-47 1.88 0.017 WL2 West Lagoon 2 4

W-16 8.11 W-14 q

4.45 9.5 0.079 Gator Upper Sunset Pond W-67 W-95 Lake W-27 W-92 0.099 0.01 0.077 3.97 W-3A W-4 0.015 4.86 Upper Sunset W-97 Note:

0.375 Dike Based upon data collected in October 2019 0 200 400 Feet 1:4,800 Lower Sunset Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet W-20 Lake W-96 Datum: North American 1983 0.077 0.111 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Fluoride in Groundwater Lower Sunset Dike WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY Mill HOPKINS, SOUTH CAROLINA Creek PROJECT NO.

60595649 PREPARED BY:

LJG DATE:

June 2020 FIGURE 11 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_11_Fluoride_Oct2019.mxd

Legend A Black Mingo Monitoring Well A Lower Floodplain Monitoring Well A Upper Floodplain Monitoring Well A Lower Surficial Monitoring Well Location W-88

< 50.0 @

A Upper Surficial Aquifer Monitoring Well Location W-89  ? Ditch

< 50.0 Culvert Dike Location Mill Creek Flow Direction W-19B Mill Creek

< 50.0 W-RW1

< 50.0 W-36 Top of Bluff W-90 < 50.0

< 50.0 W-35 Inferred Top of Bluff

< 50.0 W-87 W-91 W-43 < 50.0 Bottom of Bluff NS W-61 < 50.0 W-45

< 50.0 < 50.0 Inferred Bottom of Bluff W-65 Plan W-69 Build t W-60 Secondary Bluff Area

< 50.0 WL2 < 50.0 ing < 50.0 W-66 W-51 Tc-99 Isoconcentration Contour (pCi/L)

W-70

< 50.0 < 50.0 W-52 < 50.0 Tc-99 Inferred Isoconcentration Contour (pCi/L)

W-39 W-50 < 50.0 W-53 W-44 W-71

< 50.0 < 50.0 < 50.0 < 50.0 Tc-99 Inferred Isoconcentration Contour at a W-54 < 50.0 W-62 W-55 W-72 Concentration Less Than the Maximum

< 50.0 < 50.0 W-37

< 50.0 < 50.0 Contamminant Level (pCi/L)

W-33 < 50.0 W-56 W-41R < 50.0 W-73 WL1 W-68 < 50.0 W-57

< 50.0 < 50.0 321 Technetium-99 Concentration in pCi/L

< 50.0 < 50.0 W-RW2 W-75 Not Sampled

< 50.0 W-74 NS

< 50.0

< 50.0 SAN EL East Lagoon W-63 NL 50 W-84 W-86 W-42 < 50.0 < 50.0 North Lagoon

< 50.0 NL W-49 < 50.0 SL

< 50.0 SL South Lagoon EL W-83 W-48 < 50.0 SAN Sanitary Lagoon

< 50.0 W-82 W-26 WL1 West Lagoon 1

< 50.0 < 50.0 100 q

W-94 WL2 West Lagoon 2

< 50.0 W-23R 50 900 < 50.0 Note:

W-14 W-58

< 50.0 W-38 Based upon data collected in October 2019 Gator < 50.0 Upper Sunset W-79 SAN Pond < 50.0 < 50.0 W-67 W-93 Lake W-29 W-59 W-76< 50.0 W-27 84.3 < 50.0 W-95 W-92 W-46 < 50.0 < 50.0 W-77

< 50.0

< 50.0 < 50.0 W-4 W-3A 41.3 62.8 NL W-30 W-28 50 101

< 50.0 W-78 Upper Sunset < 50.0 W-97 49.7 SL W-17 < 50.0

< 50.0 820 0 200 400 Dike W-18R EL W-80 Feet 214 < 50.0 1:4,800 W-22 W-6 W-7A 57.4 2440 W-81 Map Projection: NAD 1983, South Carolina State Plane, W-10 210 < 50.0 FIPS 3900, Feet 118 Lower Sunset Datum: North American 1983 W-20 Lake W-32

< 50.0 W-96 W-11 321 100

< 50.0 50 3420 101 Research Drive 900 W-64 Columbia, SC 29203 81.9 W-15 W-13R T: (803) 254-4400 F: (803) 771-6676 253 63.4 W-47 W-16 W-14 94.2 < 50.0 < 50.0 Extent of Technetium-99 Lower Sunset Gator in Groundwater Dike Pond WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY Mill W-67 84.3 HOPKINS, SOUTH CAROLINA Creek PROJECT NO.

60595649 PREPARED BY:

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June 2020 FIGURE 12 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_12_Technetium_Oct2019.mxd

Legend A Upper Surficial Aquifer Monitoring Well Location A Lower Surficial Aquifer Monitoring Well Location A Black Mingo Aquifer Monitoring Well Location W-89 @

A Upper Floodplain Aquifer Monitoring Well Location

< 0.200 W-88

< 0.200 @

A Lower Floodplain Aquifer Monitoring Well Location

? Ditch Culvert Dike Location Mill Creek Flow Direction W-19B

< 0.200 Mill Creek W-36

< 0.200 Top of Bluff W-90 W-91 W-87 Inferred Top of Bluff

< 0.200 NS W-60 W-43 0.2 0.457 Bottom of Bluff

< 0.200 < 0.200 Inferred Bottom of Bluff W-35 Plan Build t W-61 W-70

< 0.200 WL2 W-65 < 0.200 W-RW1 ing < 0.200 W-69 Secondary Bluff Area

< 0.200 W-50 0.0815

< 0.200 W-66 0.101 W-45 W-71 Uranium Isoconcentration Contour (µg/L) 1.00 0.165 W-44 W-39

< 0.200 0.2 W-51 Uranium Inferred Isoconcentration Contour (µg/L)

W-40

< 0.200 < 0.200

< 0.200 < 0.200 Uranium Isoconcentration Contour at a Concentration W-62 Less Than the Maximum Contaminant Level (µg/L)

< 0.200 W-33 W-41R < 0.200 WL1 247 Total Uranium in µg/L W-68

< 0.200

< 0.200 W-RW2 30 0.0743 NS Not Sampled SAN W-84 EL East Lagoon W-46 NL 30 0.0704 W-86 W-63 W-49

< 0.200 < 0.200 NL North Lagoon W-42 0.123 W-17 W-85 0.0695 < 0.200 W-18R SL W-83 SL South Lagoon 0.0855 4.1 EL < 0.200 < 0.200 W-48

< 0.200 W-81 SAN Sanitary Lagoon W-10 W-22 W-6 0.0728 W-82 W-26 0.083 W-7A 0.872 0.232 0.151 WL1 West Lagoon 1

< 0.200 0.698 W-32 WL2 West Lagoon 2 W-94 W-11 0.224

< 0.200 W-64 < 0.200 W-15 q

< 0.200 W-13R 0.2 W-23R W-52

< 0.200 W-16 0.139 W-14 < 0.200 < 0.200 W-47 < 0.200 0.368

< 0.200 Gator W-53 Upper Sunset Pond W-67

< 0.200 W-54 W-95 Lake W-92

< 0.200 W-4

< 0.200 W-72 0.095

< 0.200 0.146 0.114 W-27 W-37

< 0.200 W-3A W-55 0.0936 Upper Sunset < 0.200 W-97

< 0.200 183 Note:

Dike W-56 Based upon data collected in October 2019 30 134 W-74

< 0.200 W-73 W-57 0 200 400 W-75 0.0831 0.207 Feet

< 0.200 1:4,800 W-58 Lower Sunset W-38 1.72 0.183 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet W-20 Lake W-96 W-29 W-59 W-79 Datum: North American 1983

< 0.200 2.05 0.2 22.2 W-93 0.0892

< 0.200 W-76 30 0.946 < 0.200 101 Research Drive Columbia, SC 29203 W-77 T: (803) 254-4400 F: (803) 771-6676 247 W-78 NL W-28 0.0933 W-30 0.429 8.91 Extent of Uranium in Groundwater Lower Sunset 0.2 Dike SL W-80 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY Mill EL 0.151 HOPKINS, SOUTH CAROLINA Creek PROJECT NO.

60595649 PREPARED BY:

LJG DATE:

June 2020 FIGURE 13 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_13_Uranium_Oct2019.mxd

Legend

( Inactive Private Wells

( Private Wells Parcel Lines 1 Mile Buffer of Facility Property Boundary Property Line SCRDI Bluff Road (Superfund Site)

Topographic Quadrangle Boundary ID Topographic Quadrangle Name 1 Southwest Columbia 2 Gaston 3 Fort Jackson South 4 Saylors Lake 5 Congaree 6 Gadsden 23 22 24 15 21 !

(!

16

(!

((

(!

((

14 !

25

( !(

17 18

(!

20

(

(

19 Dominion Energy Substation WSW-01 IWSW-02

(  !

( 1 IWSW-01  !

(

2

(

( 3 5  !

(!

( 4 7 !  !

(

CFFF

(!

9

(

6 1 General Direction 3 5

(

WSW-03 8

(

of Groundwater Flow  !

(

10

(

11

(

(!

12

(

13 2 WSW-02

(

q 0 2,000 4,000 Feet 1:48,000 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983

( WSW-04

! Data Source: Esri/USGS

^ 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Private Water Supply Well Locations WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY 4 6 HOPKINS, SOUTH CAROLINA PROJECT NO. PREPARED BY: DATE:

60595649 RGM June 2020 FIGURE 14 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_14_PrivateWaterSupplyWells.mxd

?

SW-12

??

?

Legend

? #

• Surface Water Sample Location

?

? Ditch

?  ? Culvert

?  ??  ? Mill Creek Flow Direction

?

• SW-11

1. Dike Location

?

?  ? Mill Creek

?

Property Line SW-15

? Top of Bluff

?  ?

• Inferred Top of Bluff

?

Bottom of Bluff

? Inferred Bottom of Bluff Secondary Bluff Area WL2

?

?

Entrance Dike

?

EL East Lagoon NL North Lagoon WL1 SW-17 SL South Lagoon

• ? SAN NL SAN Sanitary Lagoon

?

SW-16

? #

• SL EL  ?

• ? #

• SW-13 WL1 West Lagoon 1

• SW-18

1. SW-14 SW-19 WL2 West Lagoon 2

• SW-23

?  ?

Gator  ?

SW-20 Pond  ? Lower Sunset Lake Upper Sunset

?

• SW-21 Lake  ?

SW-22 Lower Sunset Lake Dike Upper Sunset?Lake Dike #

?

?

q 0 350 700 Feet 1:8,400 Mill  ? Map Projection: NAD 1983, South Carolina State Plane, Creek FIPS 3900, Feet Datum: North American 1983 101 Research Drive

? Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676

?

Surface Water Sample Locations WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA Exit Dike PROJECT NO.

60595649 PREPARED BY:

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June 2020 FIGURE 15 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_15_SurfaceWaterSamplingLocations.mxd

?

?

?

??

• SED-12

1. Legend

?

• Sediment Sample Collected in July 2019 Sediment Sample Collected in

• November/Decemberr 2019

?

Sediment Sampling Transects

?

? Ditch

?  ? Culvert

?  ??  ?

Mill Creek Flow Direction

?

?

• SED-11

1. Dike Location

?  ? Mill Creek

?

Property Line

? Top of Bluff

?

SED-15 #

• ? Inferred Top of Bluff

?

Bottom of Bluff Upper Sunset  ? Inferred Bottom of Bluff Lake Secondary Bluff Area WL2

?

?

Entrance Dike

?

EL East Lagoon NL North Lagoon WL1 SL South Lagoon SED-16 NL SED-17 #

• SAN

• SED-14 #

?

? SL EL SED-28  ? SAN Sanitary Lagoon SED-51

• ? #

• SED-26 # *

• SED-13 WL1 West Lagoon 1 SED-25 SED-27? #

• SED-18 SED-52 #

SED-50 Upper Sunset Lake Dike WL2 West Lagoon 2 SED-53 #

• SED-24

• SED-19

• SED-49 #

• 1. • ?

SED-20 # Gator  ?

?

• SED-48

• SED-46

• SED-23 Pond  ? Lower Sunset

• SED-47

1. *SED-45

1. *SED-44

1. Lake

? *SED-43

1. *SED-21

• SED-41 SED-42 #

• ?

SED-38 #

SED-22 Lower Sunset Lake Dike

? SED-39 #

• ?

SED-40 #

• SED-35

?

SED-37 * #

• SED-36 q

0 350 700 Feet SED-55 1:8,400 SED-56 #

• SED-54 Mill  ? Map Projection: NAD 1983, South Carolina State Plane, Creek

• FIPS 3900, Feet Datum: North American 1983 SED-34 SED-33

• SED-32 101 Research Drive

? Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676

?

SED-31 #

SED-30

• # Sediment Sample Locations

• SED-29 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA Exit Dike PROJECT NO.

60595649 PREPARED BY:

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June 2020 FIGURE 16 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_16_SedimentSamplingLocations.mxd

?

?

?

?  ?

?

Legend

?

?  !

( Soil Sampling Locations

?  ??

? Ditch

? Culvert

?

Property Line Top of Bluff

?

Inferred Top of Bluff Bottom of Bluff

?  ? Inferred Bottom of Bluff Secondary Bluff Area

?

EL East Lagoon NL North Lagoon

?  ?  ? SL South Lagoon SAN Sanitary Lagoon WL1 West Lagoon 1

? WL2 West Lagoon 2

?

SS-1

(  ?

SS-2  ?  ?

WL2  !

(

?

SS-11 WL1  !

( ! SS-13

( (

SS-12 SS-14

(

?

?

SAN NL SS-10

?

EL  !

(

SL

?  ? SS-8

? SS-7 SS-3 SS-4 SS-9 ( !

! (

(

?  ?

(  !

(

q 0 150 300 Feet SS-5 SS-6

? 1:3,600

( !

! ( Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983  ?

?  ?

?

Gator  ?

Pond  ?  ?

101 Research Drive Columbia, SC 29203 Upper Sunset T: (803) 254-4400 F: (803) 771-6676 Lake Technetium-99 Soil Sample Locations

?

?

Lower Sunset Lake WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA PROJECT NO. PREPARED BY: DATE:

60595649 RGM February 2020 FIGURE 17 Path: M:\EnvDataViz\Westinghouse\mxd\2020_Interim_RI_Data_Summary_Rpt\fig_17_SoilSamplingLocations.mxd

?

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Appendix A Laboratory Analytical Data Tables AECOM

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well WRW1 WRW2 W3A W4 W6 W7A W10 W10DUP W11 W13R W14 W15 W16 W17 W18R W19B W20 W22 W23R W24 W25 W26 W27 W28 W29 Date 10/3/2019 10/11/2019 10/10/2019 10/10/2019 10/7/2019 10/9/2019 10/9/2019 10/9/2019 10/8/2019 10/8/2019 10/18/2019 10/21/2019 10/21/2019 10/21/2019 10/7/2019 10/21/2019 10/15/2019 10/7/2019 10/18/2019 10/11/2019 10/16/2019 10/14/2019 10/10/2019 10/7/2019 10/7/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L < 5.00 < 5.00 < 5.00 < 5.00 9.09 6.35 3.19 < 5.00 7.82 < 5.00 4.27 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 10.1 < 5.00 < 5.00 < 5.00 < 5.00 Radiological Beta particles 50** pCi/L 3.98 11.9 < 5.00 19.4 1370 114 81.3 76.2 2450 53.2 35.6 174 10.6 538 150 < 5.00 < 5.00 29.6 < 5.00 < 5.00 7.27 12.5 5.10 8.26 7.67 Radiological Tritium pCi/L NA < 700 NA NA NA < 700 < 700 < 700 NA < 700 NA < 700 < 700 NA < 700 NA NA < 700 NA < 700 NA < 700 NA NA < 700 Radiological Technetium99 900 pCi/L < 50.0 < 50.0 < 50.0 41.3 2440 210 118 121 3420 63.4 < 50.0 253 < 50.0 820 214 < 50.0 < 50.0 57.4 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Radiological Uranium233/234 pCi/L < 0.500 < 0.500 < 0.500 0.313 0.372 0.409 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 1.53 < 0.500 < 0.500 0.905 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.672 1.20 Radiological Uranium235/236 pCi/L < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.219 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.266 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.198 < 0.500 < 0.500 Radiological Uranium238 pCi/L < 0.500 < 0.500 < 0.500 0.392 < 0.500 0.259 < 0.500 0.212 < 0.500 0.221 < 0.500 < 0.500 < 0.500 < 0.500 1.17 < 0.500 < 0.500 0.322 < 0.500 < 0.500 0.269 < 0.500 < 0.500 < 0.500 0.972 Radiological Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Radiological Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 0.035 J < 0.070 < 0.070 0.0177 J < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 0.026 J Radiological Uranium238 ug/L 0.0815 J 0.0743 J < 0.200 0.146 J 0.232 0.698 0.083 J 0.114 J < 0.200 0.139 J 0.368 < 0.200 < 0.200 0.0855 J 4.06 < 0.200 < 0.200 0.854 < 0.200 < 0.200 0.295 < 0.200 < 0.200 0.429 2.03 Chemical Total Uranium Isotopes 30 mg/L 0.0815 J 0.0743 J < 0.200 0.146 J 0.232 0.698 0.083 J 0.114 J < 0.200 0.139 J 0.368 < 0.200 < 0.200 0.0855 J 4.1 < 0.200 < 0.200 0.872 < 0.200 < 0.200 0.295 < 0.200 < 0.200 0.429 2.05 Chemical Fluoride 4 mg/L 0.055 0.099 0.015 4.86 0.126 6.47 3.32 3.25 0.021 8.11 0.079 1.88 9.5 2.22 6.34 0.019 0.077 5.52 0.017 0.025 0.126 1.42 3.97 5.45 4.8 Chemical Nitrate as N 10 mg/L 2.1 20 < 0.020 0.023 210 390 37 37 56 18 0.061 35 3.2 16 770 3.8 < 0.020 100 0.71 < 0.020 0.067 3.2 < 0.020 6.3 11 Metals Ammonia as N ug/L 0.0129 0.0581 0.0256 0.404 134 48.5 6.46 6.62 4.09 31.5 4.26 12.6 13.3 5.79 126 0.0146 0.0632 61.8 0.0154 0.0283 1.91 1.75 6.29 0.884 22.4 Metals Aluminum ug/L 147 J 120 J < 200 105 J < 200 < 200 559 551 < 200 831 < 200 75 J 827 < 200 < 200 < 200 < 200 1610 < 200 < 200 486 326 < 200 981 < 200 Metals Antimony 6 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 4.52 J 3.64 J < 20.0 < 20.0 < 20.0 Metals Arsenic 10 ug/L < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 5.32 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Barium 2000 ug/L 48.2 106 5.92 99.1 496 595 191 186 658 93.3 799 304 135 164 713 84.8 181 46.3 53.8 12.1 94 197 220 44.1 158 Metals Beryllium 4 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.89 J < 5.00 < 5.00 1.28 J < 5.00 < 5.00 < 5.00 < 5.00 1.76 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Cadmium 5 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 3.73 J < 5.00 1.94 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Calcium ug/L 4600 16600 490 12100 71400 99500 25100 24400 27900 20500 66000 23700 12500 16300 222000 4330 9740 55300 1380 4310 12600 16100 10700 10500 18800 Metals Chromium 100 ug/L 3.46 J < 10.0 < 10.0 < 10.0 < 10.0 4.46 J < 10.0 < 10.0 < 10.0 1.04 J 1.94 J < 10.0 < 10.0 < 10.0 < 10.0 2.27 J < 10.0 1.07 J 1.96 J < 10.0 1.95 J < 10.0 2.06 J < 10.0 < 10.0 Metals Cobalt ug/L 2.5 J 4.14 J 1.21 J 1.19 J 6.41 7.56 2.26 J 2.53 J 2.05 J 7.87 24 4.38 J 3.32 J 6.53 1.16 J < 5.00 3.69 J 7.89 < 5.00 < 5.00 < 5.00 2.93 J < 5.00 7.88 < 5.00 Metals Copper 1300 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 58.6 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 3.83 J < 20.0 Metals Iron ug/L 134 < 100 562 4930 < 100 < 100 < 100 < 100 < 100 55.1 J 11900 < 100 164 < 100 < 100 < 100 229 65.8 J < 100 626 19700 < 100 29000 56.3 J < 100 Metals Lead 15 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 100 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 4.1 J 4.81 J < 20.0 < 20.0 < 20.0 Metals Magnesium ug/L 1580 3500 251 J 5100 21600 24700 7800 7630 13200 7990 18900 9330 4230 5030 36000 1520 6900 9890 852 2260 5040 5570 13900 995 5250 Metals Manganese ug/L 38 90.3 8.71 J 539 142 824 440 427 83.5 405 3440 230 427 282 229 < 10.0 420 1280 7.36 J 2.37 J 272 239 5370 23 32.7 Metals Mercury 2 ug/L < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.084 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 Metals Nickel ug/L 4480 7.34 1.85 J 2.6 J 6.89 17.5 10.3 10.5 10.8 9.39 2.07 J 5.84 4.08 J 8.33 12 1.95 J 2.29 J 13.4 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 2.72 J < 5.00 Metals Potassium ug/L 1570 2500 664 5990 13400 11500 8800 8700 6280 9980 17500 8550 12900 7440 11400 1510 666 7030 645 934 2500 8010 3850 8120 4500 Metals Selenium 50 ug/L < 30.0 7.61 J < 30.0 6.33 J 12.9 J 14.9 J 9.01 J 7.72 J 8.48 J < 30.0 6.14 J < 30.0 < 30.0 < 30.0 23.7 J < 30.0 < 30.0 9.61 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Silver ug/L 1.14 J < 5.00 1.22 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.6 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.25 J < 5.00 1.56 J 1.68 J 1.02 J < 5.00 < 5.00 Metals Sodium ug/L 5040 19700 2410 45100 124000 447000 79300 78100 36200 50400 15700 38900 20000 35000 948000 7420 8600 159000 8150 2420 8090 21300 22400 137000 32900 Metals Thallium 2 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Vanadium ug/L < 5.00 < 5.00 < 5.00 2.36 J 4.07 J 5.11 2.56 J 2.67 J < 5.00 2.81 J < 5.00 2.03 J 2.69 J 8.37 6.59 < 5.00 < 5.00 1.92 J < 5.00 < 5.00 9.28 1.26 J < 5.00 2.32 J 8.16 SVOCs Zinc ug/L 7.63 J 7.87 J 8.59 J 7.9 J 13.9 J 4.69 J 7.18 J 41.1 45 5.79 J 11.5 J 10.7 J 19.1 J 29 26.4 7J 7.63 J 47 4.69 J 4.23 J 16 J < 20.0 4.96 J 10.3 J 4.5 J SVOCs 1,1'Biphenyl ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4,5Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4,6Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dichlorophenol ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,4Dimethylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dinitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 2,4Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,6Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Chloronaphthalene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Chlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Methylnaphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs 2Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Nitrophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3,3'Dichlorobenzidine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4,6Dinitro2methylphenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 4Bromophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloro3methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Chlorophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Nitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Acenaphthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 Page 1 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W30 W32 W33 W33DUP W35 W36 W37 W38 W39 W40 W41R W42 W43 W44 W45 W46 W47 W48DUP W48 W49DUP W49 W50 W51 W52 W53 Date 10/7/2019 10/8/2019 10/17/2019 10/17/2019 10/2/2019 10/2/2019 10/2/2019 10/4/2019 10/18/2019 10/15/2019 10/14/2019 10/22/2019 10/18/2019 10/14/2019 10/2/2019 10/21/2019 10/17/2019 10/21/2019 10/21/2019 10/24/2019 10/24/2019 10/15/2019 10/3/2019 10/3/2019 10/3/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L 7.57 7.17 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 8.93 < 5.00 < 5.00 < 5.00 4.37 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Radiological Beta particles 50** pCi/L 20.8 175 7.78 5.81 < 5.00 < 5.00 < 5.00 < 5.00 8.84 < 5.00 14.3 < 5.00 < 5.00 < 5.00 16.6 40.4 61.6 7.64 9.32 < 5.00 < 5.00 < 5.00 3.56 < 5.00 < 5.00 Radiological Tritium pCi/L < 700 < 700 < 700 < 700 NA NA NA NA < 700 NA < 700 NA < 700 < 700 NA NA < 700 < 700 < 700 NA NA NA NA NA NA Radiological Technetium99 900 pCi/L 49.7 321 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 62.8 94.2 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Radiological Uranium233/234 pCi/L 11.5 0.322 < 0.500 < 0.500 0.304 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.897 < 0.500 < 0.500 < 0.500 < 0.500 0.432 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 Radiological Uranium235/236 pCi/L 0.914 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.115 < 0.500 Radiological Uranium238 pCi/L 3.31 0.191 < 0.500 < 0.500 0.109 < 0.500 < 0.500 0.128 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.477 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 Radiological Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Radiological Uranium235 ug/L 0.199 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 0.0216 J < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 Radiological Uranium238 ug/L 8.71 0.224 < 0.200 < 0.200 < 0.200 < 0.200 0.0936 J 0.183 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.983 < 0.200 < 0.200 < 0.200 < 0.200 0.0865 J 0.0695 J 0.101 J < 0.200 < 0.200 < 0.200 Chemical Total Uranium Isotopes 30 mg/L 8.91 0.224 < 0.200 < 0.200 < 0.200 < 0.200 0.0936 J 0.183 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 1 < 0.200 < 0.200 < 0.200 < 0.200 0.0865 J 0.0695 J 0.101 J < 0.200 < 0.200 < 0.200 Chemical Fluoride 4 mg/L 8.06 3.66 0.152 0.136 0.025 0.007 0.02 0.176 0.024 0.166 0.03 1.99 0.111 0.023 0.633 0.033 4.45 0.321 0.33 0.053 0.003 0.035 0.215 1.39 0.081 Chemical Nitrate as N 10 mg/L 120 170 13 13 3.2 0.11 3.5 4.3 73 4.3 65 4.7 6.3 2.4 0.093 7.8 42 4.9 5.3 < 0.020 < 0.020 < 0.020 0.11 1.3 0.57 Metals Ammonia as N ug/L 1.83 47.9 0.0134 0.0189 0.0075 0.0089 0.0088 0.0141 0.0218 0.0203 0.0299 0.806 0.0198 0.0186 2.08 0.0129 16.5 0.0422 0.0446 0.0097 0.0151 0.0185 0.256 0.0212 0.0397 Metals Aluminum ug/L 356 < 200 < 200 < 200 < 200 < 200 < 200 80.9 J < 200 < 200 < 200 1150 < 200 < 200 90.5 J < 200 571 87.4 J 70.4 J < 200 < 200 < 200 < 200 < 200 < 200 Metals Antimony 6 ug/L < 20.0 < 20.0 4.02 J < 20.0 < 20.0 < 20.0 3.87 J 4.6 J 8.79 J 8.02 J 6.21 J < 20.0 3.76 J < 20.0 8.1 J < 20.0 5.33 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 7.32 J < 20.0 Metals Arsenic 10 ug/L < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Barium 2000 ug/L 234 484 181 201 62.5 34.9 51.6 96.7 324 16.8 655 101 159 151 28.8 144 260 99.1 97.1 11.6 10.5 8.87 57 59.9 78.2 Metals Beryllium 4 ug/L 1.03 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 3.32 J < 5.00 < 5.00 < 5.00 1.26 J 2.32 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Cadmium 5 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Calcium ug/L 90700 40600 12700 14100 16000 1430 9960 7850 41500 16700 34600 3980 8770 5460 35100 8640 22300 5870 5690 790 729 733 11600 11100 15600 Metals Chromium 100 ug/L < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 4.22 J 4.29 J < 10.0 < 10.0 1.48 J < 10.0 1.28 J 3.15 J < 10.0 < 10.0 1.24 J 1.11 J < 10.0 14.7 9.3 J < 10.0 < 10.0 1.41 J < 10.0 Metals Cobalt ug/L 1.24 J < 5.00 < 5.00 < 5.00 4.39 J < 5.00 < 5.00 1.84 J 1.52 J < 5.00 < 5.00 3.22 J < 5.00 < 5.00 2.04 J 1.16 J 7.85 < 5.00 < 5.00 1.19 J 1.25 J 2.36 J 3.06 J 6.28 10.6 Metals Copper 1300 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 6.02 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 109 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Iron ug/L < 100 < 100 < 100 < 100 < 100 460 < 100 < 100 < 100 < 100 < 100 < 100 < 100 75.8 J 34900 < 100 < 100 < 100 < 100 1010 817 443 40100 2400 5620 Metals Lead 15 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 5.76 J < 20.0 < 20.0 < 20.0 5.46 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Magnesium ug/L 4230 12000 5160 5620 4310 437 5860 4650 7620 2630 11000 1970 3590 3060 7930 4980 8890 2300 2230 333 296 J 335 3830 3740 6580 Metals Manganese ug/L 73.2 363 4.55 J 5.08 J 5.29 J 54.9 < 10.0 48.5 43.4 < 10.0 5.52 J 343 5.24 J 8.67 J 316 8.93 J 986 28.8 26.9 9.89 J 8.85 J 10.4 822 696 376 Metals Mercury 2 ug/L < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.219 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 Metals Nickel ug/L 18.7 4.04 J 4.74 J 5.71 977 < 5.00 < 5.00 271 < 5.00 < 5.00 < 5.00 1.62 J < 5.00 < 5.00 262 6.13 3.35 J < 5.00 < 5.00 3.61 J 3.11 J 3.06 J 28.2 122 2.91 J Metals Potassium ug/L 7800 9130 2780 2970 3320 1190 2230 2640 3230 2820 5240 3690 2650 2850 7530 2670 9220 3030 2940 732 607 670 2700 2430 3570 Metals Selenium 50 ug/L 8.76 J 20.3 J < 30.0 < 30.0 13 J < 30.0 8.99 J 12.8 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 10.5 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 7.27 J 9.06 J Metals Silver ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.15 J < 5.00 < 5.00 < 5.00 1.17 J 1.08 J < 5.00 1.05 J 2.18 J < 5.00 < 5.00 1.53 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Sodium ug/L 147000 221000 14400 15300 8180 5450 13300 21300 106000 2210 66600 3770 3020 5570 390000 18700 53900 10400 10100 3900 3660 3180 8610 30900 10700 Metals Thallium 2 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Vanadium ug/L 2.25 J 2.99 J < 5.00 < 5.00 < 5.00 1.72 J < 5.00 < 5.00 < 5.00 1.25 J < 5.00 < 5.00 < 5.00 < 5.00 1.33 J < 5.00 4.29 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 SVOCs Zinc ug/L 12 J 7.24 J 27.1 28.3 12.2 J 9.36 J 12.9 J 10.9 J 6.41 J < 20.0 7.38 J 4.36 J 4.53 J < 20.0 12.6 J 10.7 J 4.27 J 5.1 J 4.74 J 9.19 J 8.09 J 11.8 J 6.65 J 11.6 J 15.2 J SVOCs 1,1'Biphenyl ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 4.2 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 7.4 < 4.0 4.0 SVOCs 2,4,5Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4,6Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dichlorophenol ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,4Dimethylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dinitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 2,4Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,6Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Chloronaphthalene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Chlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Methylnaphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 12 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs 2Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Nitrophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3,3'Dichlorobenzidine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4,6Dinitro2methylphenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 4Bromophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloro3methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Chlorophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Nitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Acenaphthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 1.5 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 Page 2 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W54 W54DUP W55 W56 W57 W58 W59 W60 W61 W62 W63 W64 W65 W66 W67 W68 W69 W70 W71 W72 W73 W74 W75 W76 W77 Date 10/4/2019 10/4/2019 10/4/2019 10/4/2019 10/3/2019 10/4/2019 10/5/2019 10/17/2019 10/17/2019 10/22/2019 10/21/2019 10/17/2019 10/17/2019 10/17/2019 10/18/2019 10/22/2019 10/23/2019 10/23/2019 10/23/2019 10/4/2019 10/4/2019 10/9/2019 10/9/2019 10/5/2019 10/6/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L < 5.00 < 5.00 438 264 < 5.00 4.21 44.4 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 865 Radiological Beta particles 50** pCi/L < 5.00 < 5.00 77.3 54.5 < 5.00 < 5.00 17.4 < 5.00 < 5.00 4.85 < 5.00 70.3 7.14 < 5.00 65.3 < 5.00 < 5.00 < 5.00 8.11 < 5.00 < 5.00 < 5.00 < 5.00 6.88 111 Radiological Tritium pCi/L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Radiological Technetium99 900 pCi/L < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 81.9 < 50.0 < 50.0 84.3 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 101 Radiological Uranium233/234 pCi/L < 0.500 < 0.500 290 192 < 0.500 2.10 38.0 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.366 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 1.60 511 Radiological Uranium235/236 pCi/L < 0.500 0.0554 16.3 9.18 < 0.500 < 0.500 2.02 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 26.0 Radiological Uranium238 pCi/L < 0.500 < 0.500 60.5 37.9 < 0.500 < 0.500 8.26 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.354 81.0 Radiological Uranium234 ug/L < 0.050 < 0.050 0.052 0.034 J < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 0.089 Radiological Uranium235 ug/L < 0.070 < 0.070 5.79 4.19 < 0.070 0.049 J 0.659 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 0.0308 J 10.1 Radiological Uranium238 ug/L < 0.200 < 0.200 177 130 0.207 1.67 21.6 < 0.200 < 0.200 < 0.200 0.123 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.165 J 0.095 J 0.0831 J < 0.200 < 0.200 0.915 237 Chemical Total Uranium Isotopes 30 mg/L < 0.200 < 0.200 183 134 0.207 1.72 22.2 < 0.200 < 0.200 < 0.200 0.123 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.165 J 0.095 J 0.0831 J < 0.200 < 0.200 0.946 247 Chemical Fluoride 4 mg/L 0.258 0.26 0.062 0.257 0.057 0.18 4.18 0.034 0.036 0.019 0.259 4.27 0.783 0.076 0.01 0.02 0.022 < 0.100 0.084 0.116 0.071 0.019 0.109 1.45 9.21 Chemical Nitrate as N 10 mg/L 2.8 2.8 3.7 4.2 4.6 9.7 14 0.035 2.5 4.0 0.34 42 0.64 1.5 14 3.0 0.16 1.4 0.021 1.5 2.0 4.9 0.063 9.8 12 Metals Ammonia as N ug/L 0.0037 0.0125 0.0108 0.009 0.0155 18.6 12.3 0.0251 0.0274 0.0162 0.023 16 0.0489 0.0336 1.31 0.0143 0.0341 0.0077 0.0149 0.275 0.0167 0.159 0.391 0.0154 7.11 Metals Aluminum ug/L < 200 < 200 < 200 < 200 < 200 < 200 < 200 < 200 < 200 < 200 < 200 785 < 200 < 200 < 200 < 200 < 200 < 200 < 200 < 200 126 J < 200 < 200 894 750 Metals Antimony 6 ug/L 4.12 J < 20.0 < 20.0 7.39 J 4.3 J 7.38 J 4.22 J < 20.0 5.44 J < 20.0 < 20.0 8.91 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 7.15 J 5.12 J 3.54 J 4.18 J 4.12 J 5.99 J 3.53 J Metals Arsenic 10 ug/L < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 5.4 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Barium 2000 ug/L 61.2 61.8 41.6 57.1 73.4 167 210 121 216 75.7 70.9 394 93.7 68.5 306 92.9 68.9 91.2 22 48.9 79 151 104 129 70.9 Metals Beryllium 4 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 2.35 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.17 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.49 J < 5.00 Metals Cadmium 5 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Calcium ug/L 11900 12100 8400 11300 10600 17500 16400 6900 10400 4420 12600 22900 8060 6730 11500 4530 2480 3170 4300 11900 9540 6700 12900 4430 9350 Metals Chromium 100 ug/L 2.36 J 2.48 J 5.03 J 4.16 J 3.38 J < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 1.14 J < 10.0 < 10.0 < 10.0 2.69 J < 10.0 < 10.0 < 10.0 1.59 J 1.66 J < 10.0 < 10.0 1.12 J 2.55 J Metals Cobalt ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.82 J 5.12 < 5.00 < 5.00 14.1 1.19 J < 5.00 4.77 J < 5.00 8.08 9.91 < 5.00 5.27 6.27 3.43 J 29.2 1.41 J 1.27 J Metals Copper 1300 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 9.06 J < 20.0 < 20.0 < 20.0 10 J Metals Iron ug/L 1190 1230 < 100 < 100 30.6 J < 100 < 100 3810 150 < 100 3440 < 100 3680 < 100 < 100 30.1 J 4120 38.5 J 5910 1070 299 44.6 J 4590 < 100 223 Metals Lead 15 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 3.41 J 5.14 J < 20.0 < 20.0 5.51 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 5.18 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Magnesium ug/L 4910 4970 5170 5480 5240 6050 6590 2210 3310 1660 1770 9060 2160 2400 4130 1850 794 1410 745 3760 4600 3050 5220 1510 1970 Metals Manganese ug/L 29.9 32.1 3.76 J 7.66 J 18.9 208 62.8 76.8 330 4.32 J 259 662 193 15.4 16.5 2.94 J 412 90.4 81.6 992 454 134 740 32.9 5.83 J Metals Mercury 2 ug/L < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.284 0.189 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 Metals Nickel ug/L 144 127 17.3 4.73 J 25.6 96.7 10.3 < 5.00 4.81 J 2.04 J < 5.00 3.94 J < 5.00 < 5.00 2.64 J 2.3 J 1.94 J 4.49 J < 5.00 9.31 99.7 21.1 315 1.8 J 8.14 Metals Potassium ug/L 2590 2610 2130 2710 2740 4300 6120 2400 3850 1630 5280 8640 2200 1990 4250 1410 840 2190 7080 3260 2400 3030 3910 3900 6270 Metals Selenium 50 ug/L 13.1 J 15.4 J 9.89 J 8.58 J 11.1 J 9.88 J 8.65 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 12.9 J < 30.0 7.38 J < 30.0 < 30.0 Metals Silver ug/L < 5.00 < 5.00 < 5.00 < 5.00 1.08 J < 5.00 1.08 J < 5.00 1.75 J < 5.00 < 5.00 2.5 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.73 J < 5.00 < 5.00 1.05 J < 5.00 < 5.00 < 5.00 Metals Sodium ug/L 10900 10800 11400 14000 12300 18600 41800 7130 4000 6540 73900 49100 20900 5430 21900 6980 13600 3580 10800 12400 10200 10900 7670 22200 277000 Metals Thallium 2 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Vanadium ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 2.04 J 6.31 < 5.00 < 5.00 < 5.00 < 5.00 1.35 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 11.5 SVOCs Zinc ug/L 6.15 J 6.82 J 7.38 J 6.45 J 9.15 J 5.83 J 7.86 J 4.33 J 6.41 J 6.66 J 4.57 J < 20.0 3.98 J 4.35 J 6.72 J 6.54 J 14.4 J 12.2 J < 20.0 8.31 J 10.8 J 14.5 J 13.3 J 5.89 J 28.5 SVOCs 1,1'Biphenyl ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4,5Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4,6Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dichlorophenol ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,4Dimethylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dinitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 2,4Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,6Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Chloronaphthalene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Chlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Methylnaphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs 2Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Nitrophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3,3'Dichlorobenzidine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4,6Dinitro2methylphenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 4Bromophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloro3methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Chlorophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Nitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Acenaphthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 Page 3 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W78 W79 W80 W81 W82 W83 W84 W85 W86 W87 W88 W89 W90 W92 W93 W94 W95 W96 W97 WSW01* WSW02* WSW03* WSW04*

Date 10/5/2019 10/7/2019 10/6/2019 10/8/2019 10/8/2019 10/8/2019 10/8/2019 10/23/2019 10/23/2019 10/2/2019 10/22/2019 10/22/2019 10/22/2019 10/10/2019 10/6/2019 10/15/2019 10/15/2019 10/11/2019 10/11/2019 10/15/2019 10/22/2019 10/24/2019 10/24/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Alpha particles 15** pCi/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 3.06 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 3.63 7.11 Radiological Beta particles 50** pCi/L < 5.00 5.90 7.29 < 5.00 4.82 < 5.00 < 5.00 < 5.00 7.12 4.92 < 5.00 < 5.00 23.1 < 5.00 8.18 < 5.00 < 5.00 4.36 11.0 < 5.00 8.80 < 5.00 < 5.00 Radiological Tritium pCi/L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Radiological Technetium99 900 pCi/L < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Radiological Uranium233/234 pCi/L < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.603 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 Radiological Uranium235/236 pCi/L < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 Radiological Uranium238 pCi/L < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 0.788 0.342 Radiological Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Radiological Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 < 0.070 Radiological Uranium238 ug/L 0.0933 J 0.0892 J 0.151 J 0.0728 J 0.151 J < 0.200 0.0704 J < 0.200 < 0.200 0.457 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.114 J < 0.200 < 0.200 0.272 < 0.200 0.776 0.482 Chemical Total Uranium Isotopes 30 mg/L 0.0933 J 0.0892 J 0.151 J 0.0728 J 0.151 J < 0.200 0.0704 J < 0.200 < 0.200 0.457 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 0.114 J < 0.200 < 0.200 0.272 < 0.200 0.776 0.482 Chemical Fluoride 4 mg/L 13.4 2.4 1.57 0.042 0.046 0.079 0.087 0.23 0.511 0.278 0.012 0.011 0.039 0.099 0.043 0.043 0.077 0.111 0.375 0.023 0.103 0.013 0.013 Chemical Nitrate as N 10 mg/L 3.5 4.0 8.3 3.1 0.99 0.76 < 0.020 0.039 < 0.020 0.055 4.5 2.5 2.3 0.029 5.3 < 0.020 0.024 0.054 3.4 0.020 < 0.020 < 0.020 0.067 Metals Ammonia as N ug/L 0.0271 0.0146 0.0927 0.0762 0.0275 0.0099 0.0119 0.03 0.0073 0.0127 0.0127 0.0132 0.0147 3.19 0.0324 0.246 0.145 0.228 4.89 0.0639 0.0273 0.0655 0.0166 Metals Aluminum ug/L 1320 878 1210 < 200 107 J < 200 < 200 < 200 419 382 < 200 < 200 < 200 < 200 < 200 < 200 < 200 < 200 82.7 J < 200 < 200 < 200 78.3 J Metals Antimony 6 ug/L 3.58 J 5.15 J 5.32 J < 20.0 7.19 J < 20.0 < 20.0 6.48 J < 20.0 5.21 J < 20.0 < 20.0 < 20.0 < 20.0 4.77 J < 20.0 < 20.0 < 20.0 3.97 J < 20.0 5.89 J < 20.0 < 20.0 Metals Arsenic 10 ug/L < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 7.94 J 5.58 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Barium 2000 ug/L 54.4 75.4 124 266 162 114 215 236 101 89.8 90.5 94 101 165 91.2 114 120 128 155 3.87 J 27.1 2.78 J 7.43 Metals Beryllium 4 ug/L < 5.00 1.41 J 1.59 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.26 J < 5.00 < 5.00 Metals Cadmium 5 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Calcium ug/L 7500 11200 17000 6000 1520 4120 5960 9410 2060 5440 5450 4380 3540 6100 5470 5440 6230 8750 7250 380 1990 330 288 Metals Chromium 100 ug/L < 10.0 1.86 J < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 1.02 J < 10.0 2.85 J < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 Metals Cobalt ug/L < 5.00 < 5.00 6.06 10.3 17.3 10 19 2.69 J 3.99 J 4.87 J 1.08 J 1.08 J 1.62 J < 5.00 3.97 J 1.3 J 2.24 J 3.35 J 1.05 J 1.99 J < 5.00 4.45 J 3.66 J Metals Copper 1300 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 26.3 22.2 33.2 Metals Iron ug/L < 100 < 100 230 18800 3030 226 2710 23900 7810 3160 < 100 < 100 < 100 21200 < 100 20900 42900 32300 492 < 100 7050 < 100 < 100 Metals Lead 15 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 7.16 J < 20.0 < 20.0 < 20.0 < 20.0 4.88 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 3.91 J 5.63 J 5.14 J Metals Magnesium ug/L 1420 5490 5240 1930 902 2200 2390 3970 1180 1770 1840 1940 1300 4490 3060 2490 3880 4150 3420 184 J 970 157 J 190 J Metals Manganese ug/L 2.83 J 12.8 118 385 227 170 1060 242 39.6 386 6.1 J 7.45 J 16.5 687 171 431 538 880 98.9 3.99 J 106 3.95 J 4.84 J Metals Mercury 2 ug/L < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 Metals Nickel ug/L < 5.00 < 5.00 1.88 J 2.31 J 2.93 J 2.44 J 2.19 J < 5.00 1.64 J < 5.00 1.54 J < 5.00 < 5.00 < 5.00 2.76 J 1.94 J 2.33 J < 5.00 3.18 J 2.09 J 1.74 J 5.23 5.64 Metals Potassium ug/L 4090 4490 7300 4760 1830 1360 1720 1620 174 2250 2010 1680 1710 1630 2830 1110 1190 2020 3780 687 1020 582 879 Metals Selenium 50 ug/L 8.62 J 8.57 J 12.2 J < 30.0 < 30.0 6.14 J 9.95 J < 30.0 < 30.0 6.47 J < 30.0 < 30.0 < 30.0 < 30.0 15.3 J < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Silver ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 1.54 J 1.23 J < 5.00 1.44 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Sodium ug/L 45500 11500 53600 16800 25600 23200 25600 46200 51000 32500 6330 3430 6810 15800 11700 8060 9960 18300 20800 1620 5130 1740 1140 Metals Thallium 2 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Vanadium ug/L 7.88 < 5.00 < 5.00 1.25 J < 5.00 < 5.00 < 5.00 1.57 J 1.1 J 2.74 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 SVOCs Zinc ug/L 8.47 J 4.87 J 8.47 J 4.59 J 13.1 J 8.73 J 13.9 J 3.73 J 3.59 J 7.31 J 10.3 J < 20.0 6.93 J 3.97 J 12 J 4.18 J < 20.0 6J 9.02 J 5.83 J 13.4 J 37 116 SVOCs 1,1'Biphenyl ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4,5Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4,6Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dichlorophenol ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,4Dimethylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2,4Dinitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 2,4Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2,6Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Chloronaphthalene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Chlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Methylnaphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs 2Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 2Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 2Nitrophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3,3'Dichlorobenzidine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 3Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4,6Dinitro2methylphenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 4Bromophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloro3methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Chloroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Chlorophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs 4Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs 4Nitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Acenaphthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 Page 4 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well WRW1 WRW2 W3A W4 W6 W7A W10 W10DUP W11 W13R W14 W15 W16 W17 W18R W19B W20 W22 W23R W24 W25 W26 W27 W28 W29 Date 10/3/2019 10/11/2019 10/10/2019 10/10/2019 10/7/2019 10/9/2019 10/9/2019 10/9/2019 10/8/2019 10/8/2019 10/18/2019 10/21/2019 10/21/2019 10/21/2019 10/7/2019 10/21/2019 10/15/2019 10/7/2019 10/18/2019 10/11/2019 10/16/2019 10/14/2019 10/10/2019 10/7/2019 10/7/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Acenaphthylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Acetophenone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Atrazine 3 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Benz(a)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzaldehyde ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Benzo(a)pyrene 0.2 ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(b)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(g,h,i)perylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(k)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Bis(2chloroethoxy)methane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroethyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroisopropyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2ethylhexyl)phthalate 6 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Butyl benzyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Caprolactam ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Carbazole ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Chrysene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dinbutyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dinoctyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dibenz(a,h)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dibenzofuran ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Diethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dimethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Fluorene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Hexachlorobenzene 1 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorobutadiene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorocyclopentadiene 50 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Hexachloroethane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Indeno(1,2,3cd)pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Isophorone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodinpropylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodiphenylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Naphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Nitrobenzene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Pentachlorophenol 1 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Phenanthrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Phenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 VOCs Pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 VOCs (1Methylethyl)Benzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,1Trichloroethane 200 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2,2Tetrachloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2,4Trichlorobenzene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromo3chloropropane 0.2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromoethane 0.05 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichlorobenzene 600 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloropropane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,3Dichlorobenzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,4Dichlorobenzene 75 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 2Butanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 2Hexanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 4Methyl2pentanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs Acetone ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 VOCs Benzene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromodichloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromoform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromomethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Carbon disulfide ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Carbon tetrachloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 5 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W30 W32 W33 W33DUP W35 W36 W37 W38 W39 W40 W41R W42 W43 W44 W45 W46 W47 W48DUP W48 W49DUP W49 W50 W51 W52 W53 Date 10/7/2019 10/8/2019 10/17/2019 10/17/2019 10/2/2019 10/2/2019 10/2/2019 10/4/2019 10/18/2019 10/15/2019 10/14/2019 10/22/2019 10/18/2019 10/14/2019 10/2/2019 10/21/2019 10/17/2019 10/21/2019 10/21/2019 10/24/2019 10/24/2019 10/15/2019 10/3/2019 10/3/2019 10/3/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Acenaphthylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Acetophenone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Atrazine 3 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Benz(a)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzaldehyde ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Benzo(a)pyrene 0.2 ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(b)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(g,h,i)perylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(k)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Bis(2chloroethoxy)methane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroethyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroisopropyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2ethylhexyl)phthalate 6 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Butyl benzyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Caprolactam ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Carbazole ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 4.4 SVOCs Chrysene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dinbutyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dinoctyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dibenz(a,h)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dibenzofuran ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Diethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dimethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Fluorene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 1.7 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 1.0 SVOCs Hexachlorobenzene 1 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorobutadiene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorocyclopentadiene 50 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Hexachloroethane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Indeno(1,2,3cd)pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Isophorone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodinpropylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodiphenylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Naphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 15 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Nitrobenzene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Pentachlorophenol 1 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Phenanthrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 1.1 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 5.2 SVOCs Phenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 VOCs Pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 VOCs (1Methylethyl)Benzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.5 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,1Trichloroethane 200 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2,2Tetrachloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2,4Trichlorobenzene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromo3chloropropane 0.2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromoethane 0.05 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichlorobenzene 600 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloropropane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,3Dichlorobenzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,4Dichlorobenzene 75 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 2Butanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 50 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 2Hexanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 50 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 4Methyl2pentanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 50 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs Acetone ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 100 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 VOCs Benzene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.2 < 1.0 < 1.0 VOCs Bromodichloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromoform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromomethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 10 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Carbon disulfide ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Carbon tetrachloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 6 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W54 W54DUP W55 W56 W57 W58 W59 W60 W61 W62 W63 W64 W65 W66 W67 W68 W69 W70 W71 W72 W73 W74 W75 W76 W77 Date 10/4/2019 10/4/2019 10/4/2019 10/4/2019 10/3/2019 10/4/2019 10/5/2019 10/17/2019 10/17/2019 10/22/2019 10/21/2019 10/17/2019 10/17/2019 10/17/2019 10/18/2019 10/22/2019 10/23/2019 10/23/2019 10/23/2019 10/4/2019 10/4/2019 10/9/2019 10/9/2019 10/5/2019 10/6/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Acenaphthylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Acetophenone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Atrazine 3 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Benz(a)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzaldehyde ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Benzo(a)pyrene 0.2 ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(b)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(g,h,i)perylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(k)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Bis(2chloroethoxy)methane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroethyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroisopropyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2ethylhexyl)phthalate 6 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Butyl benzyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Caprolactam ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Carbazole ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Chrysene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dinbutyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dinoctyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dibenz(a,h)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dibenzofuran ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Diethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dimethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Fluorene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Hexachlorobenzene 1 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorobutadiene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorocyclopentadiene 50 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Hexachloroethane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Indeno(1,2,3cd)pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Isophorone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodinpropylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodiphenylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Naphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Nitrobenzene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Pentachlorophenol 1 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Phenanthrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Phenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 VOCs Pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 VOCs (1Methylethyl)Benzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,1Trichloroethane 200 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2,2Tetrachloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2,4Trichlorobenzene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromo3chloropropane 0.2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromoethane 0.05 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichlorobenzene 600 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloropropane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,3Dichlorobenzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,4Dichlorobenzene 75 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 2Butanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 50 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 2Hexanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 50 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 4Methyl2pentanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 50 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs Acetone ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 100 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 VOCs Benzene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.2 < 1.0 < 1.0 VOCs Bromodichloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 3.4 VOCs Bromoform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 11 VOCs Bromomethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 10 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Carbon disulfide ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Carbon tetrachloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 7 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W78 W79 W80 W81 W82 W83 W84 W85 W86 W87 W88 W89 W90 W92 W93 W94 W95 W96 W97 WSW01* WSW02* WSW03* WSW04*

Date 10/5/2019 10/7/2019 10/6/2019 10/8/2019 10/8/2019 10/8/2019 10/8/2019 10/23/2019 10/23/2019 10/2/2019 10/22/2019 10/22/2019 10/22/2019 10/10/2019 10/6/2019 10/15/2019 10/15/2019 10/11/2019 10/11/2019 10/15/2019 10/22/2019 10/24/2019 10/24/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Acenaphthylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Acetophenone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Atrazine 3 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Benz(a)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzaldehyde ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Benzo(a)pyrene 0.2 ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(b)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(g,h,i)perylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Benzo(k)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Bis(2chloroethoxy)methane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroethyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2chloroisopropyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Bis(2ethylhexyl)phthalate 6 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Butyl benzyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Caprolactam ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 SVOCs Carbazole ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Chrysene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dinbutyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dinoctyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dibenz(a,h)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Dibenzofuran ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Diethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Dimethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Fluorene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Hexachlorobenzene 1 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorobutadiene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Hexachlorocyclopentadiene 50 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Hexachloroethane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Indeno(1,2,3cd)pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Isophorone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodinpropylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs NNitrosodiphenylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Naphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Nitrobenzene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 SVOCs Pentachlorophenol 1 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Phenanthrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 SVOCs Phenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 VOCs Pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 VOCs (1Methylethyl)Benzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,1Trichloroethane 200 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2,2Tetrachloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1,2Trichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2,4Trichlorobenzene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromo3chloropropane 0.2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dibromoethane 0.05 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichlorobenzene 600 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,2Dichloropropane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,3Dichlorobenzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 1,4Dichlorobenzene 75 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs 2Butanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 2Hexanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 4Methyl2pentanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs Acetone ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 VOCs Benzene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromodichloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromoform ug/L < 1.0 < 1.0 3.9 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Bromomethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Carbon disulfide ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 2.1 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Carbon tetrachloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 8 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well WRW1 WRW2 W3A W4 W6 W7A W10 W10DUP W11 W13R W14 W15 W16 W17 W18R W19B W20 W22 W23R W24 W25 W26 W27 W28 W29 Date 10/3/2019 10/11/2019 10/10/2019 10/10/2019 10/7/2019 10/9/2019 10/9/2019 10/9/2019 10/8/2019 10/8/2019 10/18/2019 10/21/2019 10/21/2019 10/21/2019 10/7/2019 10/21/2019 10/15/2019 10/7/2019 10/18/2019 10/11/2019 10/16/2019 10/14/2019 10/10/2019 10/7/2019 10/7/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chlorobenzene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Chloroethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Chloroform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.1 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.9 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 VOCs Chloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 2.8 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.3 1.5 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 3.7 < 1.0 < 1.0 < 1.0 VOCs cis1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Cyclohexane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Dibromochloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Dichlorodifluoromethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Ethylbenzene 700 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl acetate ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl tertbutyl ether ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methylcyclohexane ug/L < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 VOCs Methylene chloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Styrene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Tetrachloroethene 5 ug/L 1.4 140 < 1.0 < 1.0 16 1.9 < 1.0 < 1.0 1.4 15 1.1 12 7.8 4.3 3.5 150 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Toluene 1000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Trichloroethene 5 ug/L < 1.0 8.3 < 1.0 < 1.0 2.5 < 1.0 < 1.0 < 1.0 < 1.0 1.4 < 1.0 2.0 2.2 < 1.0 < 1.0 2.5 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Trichlorofluoromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Xylenes, Total 10000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 9 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W30 W32 W33 W33DUP W35 W36 W37 W38 W39 W40 W41R W42 W43 W44 W45 W46 W47 W48DUP W48 W49DUP W49 W50 W51 W52 W53 Date 10/7/2019 10/8/2019 10/17/2019 10/17/2019 10/2/2019 10/2/2019 10/2/2019 10/4/2019 10/18/2019 10/15/2019 10/14/2019 10/22/2019 10/18/2019 10/14/2019 10/2/2019 10/21/2019 10/17/2019 10/21/2019 10/21/2019 10/24/2019 10/24/2019 10/15/2019 10/3/2019 10/3/2019 10/3/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chlorobenzene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Chloroethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 10 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Chloroform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Chloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 13 < 1.0 4.4 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 2.0 2.1 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs cis1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Cyclohexane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Dibromochloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Dichlorodifluoromethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 10 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Ethylbenzene 700 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 2.3 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl acetate ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl tertbutyl ether ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methylcyclohexane ug/L < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 25 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 VOCs Methylene chloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Styrene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Tetrachloroethene 5 ug/L < 1.0 1.4 300 330 2.6 < 1.0 < 1.0 1.8 290 < 1.0 190 < 1.0 < 1.0 < 1.0 < 1.0 2.5 1.6 200 200 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Toluene 1000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Trichloroethene 5 ug/L < 1.0 < 1.0 38 24 < 1.0 < 1.0 < 1.0 11 5.2 < 1.0 14 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 4.7 4.9 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Trichlorofluoromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Xylenes, Total 10000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 10 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W54 W54DUP W55 W56 W57 W58 W59 W60 W61 W62 W63 W64 W65 W66 W67 W68 W69 W70 W71 W72 W73 W74 W75 W76 W77 Date 10/4/2019 10/4/2019 10/4/2019 10/4/2019 10/3/2019 10/4/2019 10/5/2019 10/17/2019 10/17/2019 10/22/2019 10/21/2019 10/17/2019 10/17/2019 10/17/2019 10/18/2019 10/22/2019 10/23/2019 10/23/2019 10/23/2019 10/4/2019 10/4/2019 10/9/2019 10/9/2019 10/5/2019 10/6/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chlorobenzene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Chloroethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 10 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Chloroform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 11 VOCs Chloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 13 22 1.5 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 1.9 < 1.0 < 1.0 < 1.0 VOCs cis1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Cyclohexane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Dibromochloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 3.6 VOCs Dichlorodifluoromethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 10 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Ethylbenzene 700 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl acetate ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl tertbutyl ether ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methylcyclohexane ug/L < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 25 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 VOCs Methylene chloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Styrene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 42 1.0 1.3 220 480 49 110 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 19 < 1.0 < 1.0 < 1.0 VOCs Toluene 1000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.1 < 1.0 84 8.5 8.4 1.8 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 4.5 < 1.0 63 < 1.0 VOCs Trichlorofluoromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Xylenes, Total 10000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 5.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Page 11 of 12

Table A1 October 2019 Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Well W78 W79 W80 W81 W82 W83 W84 W85 W86 W87 W88 W89 W90 W92 W93 W94 W95 W96 W97 WSW01* WSW02* WSW03* WSW04*

Date 10/5/2019 10/7/2019 10/6/2019 10/8/2019 10/8/2019 10/8/2019 10/8/2019 10/23/2019 10/23/2019 10/2/2019 10/22/2019 10/22/2019 10/22/2019 10/10/2019 10/6/2019 10/15/2019 10/15/2019 10/11/2019 10/11/2019 10/15/2019 10/22/2019 10/24/2019 10/24/2019 Group Analyte MCL Units Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chlorobenzene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Chloroethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Chloroform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.3 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Chloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 2.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 5.3 4.3 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs cis1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Cyclohexane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Dibromochloromethane ug/L < 1.0 < 1.0 1.8 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Dichlorodifluoromethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 VOCs Ethylbenzene 700 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl acetate ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methyl tertbutyl ether ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Methylcyclohexane ug/L < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 VOCs Methylene chloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Styrene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 38 4.1 2.1 < 1.0 < 1.0 24 < 1.0 < 1.0 < 1.0 4.3 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Toluene 1000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs trans1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 11 < 1.0 < 1.0 < 1.0 < 1.0 2.8 < 1.0 < 1.0 < 1.0 1.2 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Trichlorofluoromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 2.9 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 VOCs Xylenes, Total 10000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 Notes: DUP field duplicate sample

• private water supply well groundwater sample MCL Maximum Contaminant Level

• • sitespecific action level pCi/L picocuries per liter ug/L micrograms per liter mg/L milligrams per liter SVOCs semivolatile organic compounds VOCs volatile organic compounds NA not analyzed Bold concentrations indicate detections Concentrations in shaded cells exceed their MCL Page 12 of 12

Table A2 Surface Water Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Location SW11 SW12 SW13 SW14 SW16 SW17DUP SW17 SW18 SW19 SW20 SW21 SW22 SW23 Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 Group Analyte MCL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 900 pci/L < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 < 50.0 Radiological Uranium233/234 pci/L 0.296 < 0.500 < 0.500 0.575 3.34 < 0.500 < 0.500 < 0.500 0.587 2.35 < 0.500 < 0.500 < 0.500 Radiological Uranium235/236 pci/L < 0.500 < 0.500 < 0.500 < 0.500 0.145 < 0.500 < 0.500 < 0.500 < 0.500 0.123 < 0.500 < 0.500 < 0.500 Radiological Uranium238 pci/L < 0.500 < 0.500 < 0.500 < 0.500 0.710 < 0.500 < 0.500 < 0.500 < 0.500 0.626 < 0.500 < 0.500 < 0.500 Radiological Uranium234 ug/L < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 < 0.050 Radiological Uranium235 ug/L < 0.070 < 0.070 < 0.070 < 0.070 0.0682 J < 0.070 < 0.070 < 0.070 0.0174 J 0.0274 J < 0.070 < 0.070 < 0.070 Radiological Uranium238 ug/L 0.365 < 0.200 0.134 J 0.297 1.71 0.229 0.246 0.304 0.507 1.11 0.16 J 0.199 J 0.0673 J Radiological Total Uranium 30 ug/L 0.365 < 0.2 0.134 0.297 1.78 0.229 0.246 0.304 0.524 1.14 0.160 0.199 0.0673 Chemical Fluoride 4 mg/L 0.546 0.228 0.249 0.233 4.35 0.290 0.290 0.208 0.376 0.640 0.244 0.187 0.459 Chemical Nitrate as N 10 mg/L 0.146 0.296 0.226 0.234 1.69 0.471 0.460 0.309 0.154 0.494 0.433 0.432 4.94 Chemical Ammonia mg/L < 0.020 < 0.020 < 0.020 0.63 0.48 3.8 3.8 5.7 < 0.020 < 0.020 < 0.02 < 0.02 7.3 Metals Aluminum ug/L 634 118 J 212 91.3 J 155 J 141 J 144 J 721 337 234 116 J 102 J 203 Metals Antimony 6 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Arsenic 10 ug/L < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Barium 2000 ug/L 113 52.2 101 66 12.3 81.8 85.3 91.8 67.1 66.3 28.3 34.5 84.4 Metals Beryllium 4 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Cadmium 5 ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Calcium ug/L 3380 6540 7900 6570 4690 9770 10000 8150 4010 7450 3480 3760 16400 Metals Chromium 100 ug/L 1.47 J < 10.0 1.25 J < 10.0 2.64 J < 10.0 < 10.0 1.19 J < 10.0 < 10.0 < 10.0 < 10.0 < 10.0 Metals Cobalt ug/L 3.96 J 1.01 J 2.35 J < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 5.38 2.24 J < 5.00 < 5.00 < 5.00 Metals Copper 1300 ug/L 3.37 J < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Iron ug/L 2410 1110 3820 1180 614 682 715 1260 3890 4710 612 844 69.7 J Metals Lead 15 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Magnesium ug/L 1030 1340 1490 1240 326 2130 2280 2140 1270 1720 1020 1110 4800 Metals Manganese ug/L 944 1320 1860 275 26.8 82.9 86.5 41 528 642 107 189 73.3 Metals Mercury 2 ug/L 0.081 J < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 < 0.200 Metals Nickel ug/L 1.82 J < 5.00 < 5.00 < 5.00 3.5 J 31.4 33.4 14.8 3.17 J 1.7 J 1.86 J 1.83 J 1.68 J Metals Potassium ug/L 1920 1690 1850 1620 816 2640 2710 2280 3010 3780 1310 1420 6320 Metals Selenium 50 ug/L < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 < 30.0 Metals Silver ug/L < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 < 5.00 Metals Sodium ug/L 1980 4860 3780 4530 1090 11200 11300 9550 918 4200 3590 3810 48900 Metals Thallium 2 ug/L < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 < 20.0 Metals Vanadium ug/L 4.62 J < 5.00 1.79 J < 5.00 < 5.00 < 5.00 < 5.00 1.84 J 2.25 J 1.57 J < 5.00 < 5.00 1.03 J Metals Zinc ug/L 15.2 J 5.55 J 11.4 J 13 J 44.6 14.7 J 15.6 J 15.3 J 8.82 J 7.65 J 5.61 J 6.12 J 4.54 J SVOCs 1,1'Biphenyl ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 2,4,5Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 2,4,6Trichlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 2,4Dichlorophenol ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs 2,4Dimethylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 2,4Dinitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 2,4Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs 2,6Dinitrotoluene ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs 2Chloronaphthalene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 2Chlorophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 2Methylnaphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs 2Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 2Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs 2Nitrophenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 3,3'Dichlorobenzidine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 3Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs 4,6Dinitro2methylphenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs 4Bromophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 4Chloro3methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 4Chloroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs 4Chlorophenyl phenyl ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 4Methylphenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs 4Nitroaniline ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs 4Nitrophenol ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Acenaphthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Acenaphthylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Acetophenone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 Page 1 of 3

Table A2 Surface Water Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Location SW11 SW12 SW13 SW14 SW16 SW17DUP SW17 SW18 SW19 SW20 SW21 SW22 SW23 Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 Group Analyte MCL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Atrazine 3 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Benz(a)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Benzaldehyde ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs Benzo(a)pyrene 0.2 ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Benzo(b)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Benzo(g,h,i)perylene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Benzo(k)fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Bis(2chloroethoxy)methane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Bis(2chloroethyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Bis(2chloroisopropyl)ether ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Bis(2ethylhexyl)phthalate 6 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Butyl benzyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Caprolactam ug/L < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 < 8.0 <8 <8 < 8.0 SVOCs Carbazole ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Chrysene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Dibenz(a,h)anthracene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Dibenzofuran ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Diethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Dimethyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Dinbutyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Dinoctyl phthalate ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Fluoranthene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Fluorene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Hexachlorobenzene 1 ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Hexachlorobutadiene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Hexachlorocyclopentadiene 50 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Hexachloroethane ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Indeno(1,2,3cd)pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Isophorone ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Naphthalene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Nitrobenzene ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs NNitrosodinpropylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs NNitrosodiphenylamine ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Pentachlorophenol 1 ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 SVOCs Phenanthrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 SVOCs Phenol ug/L < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 < 4.0 <4 <4 < 4.0 SVOCs Pyrene ug/L < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.80 < 0.8 < 0.8 < 0.80 VOCs (1Methylethyl)Benzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,1,1Trichloroethane 200 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,1,2,2Tetrachloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,1,2Trichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,1Dichloroethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,1Dichloroethene 7 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,2,4Trichlorobenzene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,2Dibromo3chloropropane 0.2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,2Dibromoethane 0.05 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,2Dichlorobenzene 600 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,2Dichloroethane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,2Dichloropropane 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,3Dichlorobenzene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 1,4Dichlorobenzene 75 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs 2Butanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 2Hexanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs 4Methyl2pentanone ug/L < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 VOCs Acetone ug/L < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 VOCs Benzene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Bromodichloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Bromoform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Bromomethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 <2 <2 < 2.0 VOCs Carbon disulfide ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Carbon tetrachloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Chlorobenzene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Chloroethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 <2 <2 < 2.0 VOCs Chloroform ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 Page 2 of 3

Table A2 Surface Water Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Location SW11 SW12 SW13 SW14 SW16 SW17DUP SW17 SW18 SW19 SW20 SW21 SW22 SW23 Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 Group Analyte MCL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs cis1,2Dichloroethene 70 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs cis1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Cyclohexane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Dibromochloromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Dichlorodifluoromethane ug/L < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 < 2.0 <2 <2 < 2.0 VOCs Ethylbenzene 700 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Methyl acetate ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Methyl tertbutyl ether ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Methylcyclohexane ug/L < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 < 5.0 <5 <5 < 5.0 VOCs Methylene chloride 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Styrene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Tetrachloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 16 16 14 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Toluene 1000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs trans1,2Dichloroethene 100 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs trans1,3Dichloropropene ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Trichloroethene 5 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 1.0 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Trichlorofluoromethane ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Vinyl chloride 2 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 VOCs Xylenes, Total 10000 ug/L < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 < 1.0 <1 <1 < 1.0 Notes: DUP field duplicate sample MCL Maximum Contaminant Level pCi/L picocuries per liter ug/L micrograms per liter mg/L milligrams per liter SVOCs semivolatile organic compounds VOCs volatile organic compounds Bold concentrations indicate detections Concentrations in shaded cells exceed their MCL Page 3 of 3

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED11 SED12 SED13 SED14 SED15 SED16 SED17 SED17DUP SED18 SED19 SED20 SED21 SED22 SED23 SED24 SED25* SED26*

Depth 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/16/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 7/16/2019 7/18/2019 7/18/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89400 pCi/g 0.00 # 0.00 # 0.00 # 0.0243 ## 5.62 ## 4.94 ## 7.50 ## 0.00 # 0.00 # 6.28 ## 0.00 # 4.12 ## 0.00 # 50.8 35.8 8.55 ## 1.68 ##

Radiological Uranium233/234 13 3310 pCi/g 1.14 0.925 1.67 1.42 2.58 14.9 0.658 1.07 0.219 32.5 62.5 1.86 117 1.35 1.14 907 222 Radiological Uranium235/236 8 39 pCi/g 0.00159 ## 0.0647 ## 0.156 ## 0.025 ## 0.181 0.678 0.0235 ## 0.104 ## 0.0173 ## 2.30 3.12 0.104 ## 4.98 0.00261 ## 0.0608 ## 41.1 11.0 Radiological Uranium238 14 179 pCi/g 0.742 1.17 1.33 0.389 2.05 2.77 0.302 0.354 0.298 8.18 14.9 1.96 28.0 1.69 0.944 149 46.9 Radiological Uranium234 ug/kg < 25.7 < 25.6 < 15.4 < 12.1 < 12.4 < 12.0 < 11.0 < 11.8 < 12.0 4.27 J 12.7 J < 30.8 22 J < 14.4 < 15.9 225 129 Radiological Uranium235 ug/kg 11.5 J 16 J 13.8 J 5.32 J 51.2 114 6.57 J 2.9 J 5J 451 1310 27.8 J 2230 18.3 J 15.9 J 27100 14200 Radiological Uranium238 ug/kg 1320 1700 1360 260 5790 3310 401 140 265 16200 49700 2840 80700 2250 1680 646000 487000 Radiological Total Uranium ug/kg 1330 1720 1370 265 5840 3420 408 143 270 16700 51000 2870 83000 2270 1700 673000 501000 Chemical Fluoride mg/kg 723 560 98.5 6.43 49.0 13.5 4.15 3.66 3.48 401 1600 532 978 214 70.5 2270 167 Chemical Nitrate as N mg/kg 0.33 0.24 0.2 < 0.2 < 0.20 2.7 2.1 0.95 < 0.20 1.2 < 0.20 < 0.2 < 0.2 < 0.20 0.20 0.27 1.4 Chemical Ammonia mg/kg 1.35 J 2.26 J 1.45 J < 1.21 2.09 8.73 0.908 J 0.814 J < 1.22 3.51 15.7 2.17 J 4.64 38.1 49.2 53.3 4.61 Metals Aluminum ug/kg 10400 10300 8230 502 3510 682 459 340 401 3600 11000 31200 25800 19800 10500 6570 5540 Metals Antimony ug/kg < 5.29 < 4.93 <3 0.511 J < 2.42 0.447 J 0.482 J 0.512 J < 2.53 < 3.75 < 11.7 <6 < 6.26 < 2.87 < 2.94 5.01 J 1.22 J Metals Arsenic ug/kg < 7.94 < 7.39 2.14 J < 3.61 < 3.63 < 3.69 < 3.46 < 3.35 < 3.8 < 5.63 4.21 J 6.38 J 4.62 J 3.36 J < 4.4 < 26.7 0.795 J Metals Barium ug/kg 126 118 131 5.16 15.9 5.1 4.92 4.61 4.9 50.2 140 250 209 127 76.8 103 56 Metals Beryllium ug/kg 0.718 J 1.13 J 1.02 < 0.601 0.258 J < 0.614 < 0.577 < 0.558 < 0.634 0.361 J 1.14 J 2.39 2.02 2.09 0.896 < 4.44 0.253 J Metals Cadmium ug/kg < 1.32 < 1.23 < 0.751 < 0.601 0.14 J < 0.614 < 0.577 < 0.558 < 0.634 < 0.939 < 2.92 < 1.5 0.374 J 0.209 J < 0.734 2J 0.61 J Metals Calcium ug/kg 1110 1020 620 142 452 117 48.5 32.9 21.7 J 375 3550 484 872 770 606 10500 3950 Metals Chromium ug/kg 9.99 8.34 18.4 1.24 6.91 1.77 1.02 J 0.576 J 0.606 J 5.32 13.6 40 35.1 29.3 15.2 35.7 49.6 Metals Cobalt ug/kg 4.34 2.97 11.6 0.269 J 1.52 < 0.614 0.175 J 0.326 J < 0.634 3.92 6.31 18.9 16.6 11.8 5 8.69 2.95 Metals Copper ug/kg 7.14 5.39 8.83 0.386 J 2.75 1J < 2.31 < 2.23 < 2.53 5.33 19.5 29.8 33.1 18.5 7.79 418 116 Metals Iron ug/kg 7610 4320 15000 581 4630 1070 257 217 217 3770 10200 25900 32500 29500 10100 12300 2840 Metals Lead ug/kg 24 28 13.9 0.865 J 3.74 1.26 J 0.439 J 0.42 J 0.476 J 8.3 25.5 25 37.4 14.4 8.69 45.9 29.3 Metals Magnesium ug/kg 481 279 1240 91.5 194 22.3 J 35.7 14.4 J 15 J 238 751 3320 2180 2980 1220 1180 679 Metals Manganese ug/kg 230 150 332 15.6 54.8 3.72 18 11.9 12.3 123 246 345 389 268 123 97.2 23 Metals Mercury ug/kg 62.3 56.8 15.7 J < 12.7 5.46 J < 14.9 < 14.2 < 13.3 < 13.1 34.6 121 75.8 113 40.3 25.8 407 576 Metals Nickel ug/kg 4.13 3.51 7.33 0.341 J 2.21 0.568 J 0.773 0.442 J 0.492 J 8.68 15.5 18.7 43.3 11.5 5.45 86.7 75.1 Metals Potassium ug/kg 300 263 538 84.4 200 139 87.4 95.4 90.7 205 664 1890 1410 2010 846 798 170 Metals Selenium ug/kg 2.38 J < 7.39 < 4.51 < 3.61 < 3.63 < 3.69 < 3.46 < 3.35 < 3.8 < 5.63 < 17.5 1.51 J 3.29 J < 4.31 0.885 J 4.72 J 0.72 J Metals Silver ug/kg < 1.32 < 1.23 < 0.751 < 0.601 < 0.606 < 0.614 < 0.577 < 0.558 < 0.634 < 0.939 < 2.92 < 1.5 < 1.56 < 0.718 < 0.734 323 544 Metals Sodium ug/kg 34.8 J 42 J 32.5 J 18.8 J 41.4 12.9 J 14.1 J 17.1 J 13.5 J 19.9 J 109 J 119 69.7 J 130 94.7 919 90.4 Metals Thallium ug/kg < 5.29 < 4.93 < 30 < 2.4 < 2.42 < 2.46 < 2.31 < 2.23 < 2.53 < 3.75 < 11.7 < 60 < 62.6 < 28.7 < 29.4 < 17.8 < 2.6 Metals Vanadium ug/kg 25.9 21.6 36.5 1.74 10.5 2.81 1.18 1.43 1.6 13.3 41 100 73.7 70.5 33.5 22.2 7.25 Metals Zinc ug/kg 38.2 23 33.8 5.64 50.8 6.09 2.42 1.24 J 1J 32.4 63.8 73.1 138 46 22.8 9070 229 SVOCs 1,1'Biphenyl ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2,4,5Trichlorophenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2,4,6Trichlorophenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2,4Dichlorophenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2,4Dimethylphenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2,4Dinitrophenol ug/kg < 320 < 330 < 320 < 310 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 320 < 310 < 320 < 1600 SVOCs 2,4Dinitrotoluene ug/kg < 130 < 130 < 130 < 120 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 120 < 120 < 630 SVOCs 2,6Dinitrotoluene ug/kg < 130 < 130 < 130 < 120 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 120 < 120 < 630 SVOCs 2Chloronaphthalene ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2Chlorophenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2Methylnaphthalene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs 2Methylphenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 2Nitroaniline ug/kg < 130 < 130 < 130 < 120 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 120 < 120 < 630 SVOCs 2Nitrophenol ug/kg < 130 < 130 < 130 < 120 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 120 < 120 < 630 SVOCs 3,3'Dichlorobenzidine ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 3Nitroaniline ug/kg < 130 < 130 < 130 < 120 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 120 < 120 < 630 SVOCs 4,6Dinitro2methylphenol ug/kg < 320 < 330 < 320 < 310 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 320 < 310 < 320 < 1600 SVOCs 4Bromophenyl phenyl ether ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 4Chloro3methylphenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 4Chloroaniline ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 4Chlorophenyl phenyl ether ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs 4Methylphenol ug/kg < 130 < 130 < 130 < 120 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 120 < 120 < 630 SVOCs 4Nitroaniline ug/kg < 130 < 130 < 130 < 120 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 130 < 120 < 120 < 630 SVOCs 4Nitrophenol ug/kg < 320 < 330 < 320 < 310 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 320 < 310 < 320 < 1600 SVOCs Acenaphthene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Acenaphthylene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Acetophenone ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 Page 1 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED27** SED28** SED29 SED29 SED29 SED30 SED30 SED31 SED31 SED32 SED32 SED33 SED33 SED33 SED34 SED34 SED35 Depth 0 6 in 0 6 in 0 6 in 6 12 in 12 16 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 1216 in 12 16 in 0 6 in 0 6 in Date 7/18/2019 7/18/2019 11/20/2019 11/20/2019 11/20/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/22/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89400 pCi/g 0.00 # 5.75 U 0.00 # 0.00 # 0.00 # 2.43 ## 0.00 # 0.959 ## 0.00 # 5.06 ## 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 0.00 #

Radiological Uranium233/234 13 3310 pCi/g 225 254 6.23 1.81 1.23 5.71 1.41 2.81 2.96 3.71 10.0 5.06 1.27 1.06 3.13 2.93 2.26 Radiological Uranium235/236 8 39 pCi/g 11.9 12.4 0.313 0.208 0.175 0.191 0.0337 ## 0.0669 ## 0.110 ## 0.097 ## 0.469 0.394 0.0959 ## 0.0461 ## 0.131 ## 0.0487 ## 0.179 Radiological Uranium238 14 179 pCi/g 37.4 44.6 2.51 1.55 1.16 2.51 1.28 1.75 1.69 2.00 3.28 2.52 1.56 1.09 1.81 1.73 1.59 Radiological Uranium234 ug/kg 38.9 J 57.2 J < 24.3 < 18.4 < 15.1 < 20.4 < 21.1 < 14.5 < 12.4 < 19.9 < 18.4 < 16.5 < 14.7 < 14.1 < 17.6 < 16.3 < 14.0 Radiological Uranium235 ug/kg 3970 6770 86.4 21.4 J 17.6 J 85.9 21 J 45.6 18.1 72.9 195 305 21.8 16.5 J 44.9 36.3 36.8 Radiological Uranium238 ug/kg 90900 161000 6030 2490 2490 5410 2690 3400 2220 4280 8370 14200 2750 2230 3650 3770 3920 Radiological Total Uranium ug/kg 94900 168000 6120 2510 2510 5500 2710 3450 2240 4350 8570 14500 2770 2250 3690 3810 3960 Chemical Fluoride mg/kg 395 1560 455 287 230 394 392 286 118 480 576 248 117 67.3 397 336 158 Chemical Nitrate as N mg/kg 0.30 < 0.20 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 1.1 < 0.50 < 0.50 < 0.50 0.62 < 0.50 < 0.50 Chemical Ammonia mg/kg 171 39.3 1.14 J 2.56 2.61 2.26 3.43 3.13 3.07 3.88 4.21 1.57 J 1.56 6.63 2.20 4.26 2.09 Metals Aluminum ug/kg 1860 5790 25900 19800 17000 24000 21700 20400 15500 15200 17600 23200 18200 15500 23600 24200 24800 Metals Antimony ug/kg 4.79 J 6.81 J < 4.85 < 3.53 < 2.97 < 4.08 < 4.41 < 28.4 < 25.6 < 4.15 < 3.44 < 35.6 < 30.3 < 2.73 < 3.59 < 32.8 < 29.9 Metals Arsenic ug/kg < 15.4 < 19.7 4.24 J 2.31 J 2.45 J 3.6 J 2.49 J 4.51 2.85 J 2.47 J 3.35 J 5.43 3.27 J 3.14 J 4.41 J 4.44 J 3.07 J Metals Barium ug/kg 723 1220 207 157 147 174 140 213 239 168 203 167 163 135 174 170 203 Metals Beryllium ug/kg < 2.57 < 3.28 1.83 1.86 2.13 1.99 2.32 1.69 1.67 1.35 1.53 1.83 2.07 1.63 1.96 2.7 2.05 Metals Cadmium ug/kg < 2.57 < 3.28 < 1.21 < 0.884 < 0.743 < 1.02 < 1.1 < 0.709 < 0.641 < 1.04 < 0.86 < 0.89 < 0.756 < 0.682 < 0.898 < 0.82 < 0.747 Metals Calcium ug/kg 253000 284000 809 441 272 424 448 796 679 1140 742 292 182 150 843 762 490 Metals Chromium ug/kg 78.9 75.3 33.8 28.3 25.3 32.3 28.3 26.4 22.8 22.6 25.9 28.3 25.6 23.4 28.7 32.7 33.5 Metals Cobalt ug/kg 2J 2.91 J 8.36 5.92 3.7 8.26 4.64 14.3 16.4 9.95 10 11.4 13.8 6.84 15.9 17.5 17.4 Metals Copper ug/kg 20.9 36.4 27.9 17.6 13.1 24.1 17 20.5 17.3 19.6 22.3 21.9 19.3 12.9 26.3 24.8 23.2 Metals Iron ug/kg 4310 29100 17600 12400 9170 15100 10000 28600 30000 18600 21300 29300 29100 16700 32800 32200 30300 Metals Lead ug/kg 18.5 91.7 28.2 15.2 11.3 41.8 13.4 22.9 14.1 24.1 40 20.1 11.7 11.8 31.3 22.3 12.2 Metals Magnesium ug/kg 17200 16500 2800 2180 971 3240 1400 3080 3110 2440 2570 3060 3590 1370 3110 4000 4450 Metals Manganese ug/kg 102 149 223 128 66.2 207 122 788 1090 410 323 295 281 176 906 1020 461 Metals Mercury ug/kg 287 526 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Metals Nickel ug/kg 255 143 15.2 10.8 8.4 13.4 9.48 12.2 10.7 11.2 13.9 12.9 12.1 7.21 13.2 14.2 14.7 Metals Potassium ug/kg 308 3650 1400 1060 297 1580 509 1760 1610 1090 1090 1460 1700 443 1320 1290 2130 Metals Selenium ug/kg 2.58 J 3.69 J < 7.27 < 5.3 < 4.46 < 6.12 < 6.61 < 4.26 < 3.84 1.17 J 0.904 J < 5.34 < 4.54 < 4.09 1.05 J 1.23 J < 4.48 Metals Silver ug/kg 10.5 27.6 < 12.1 < 8.84 < 7.43 < 10.2 < 11 < 7.09 < 6.41 < 10.4 < 8.6 < 8.9 < 7.56 < 6.82 < 8.98 < 8.2 < 7.47 Metals Sodium ug/kg 6330 7260 125 97.1 77.7 95.9 110 52.7 52.6 68.2 89.1 85.7 59.7 48.8 64.9 62.5 59.2 Metals Thallium ug/kg < 10.3 < 13.1 < 48.5 < 35.3 < 29.7 < 40.8 < 44.1 < 28.4 < 25.6 < 41.5 < 34.4 < 35.6 < 30.3 < 27.3 < 35.9 < 32.8 < 29.9 Metals Vanadium ug/kg 5.71 5.67 85.6 58.6 40.3 71.9 51.2 73.4 61.9 53.5 64.3 81.1 74.4 56.4 86.1 89.1 74.1 Metals Zinc ug/kg 523 403 69.1 43.5 29.8 68.8 31.5 56.2 45.9 62.4 60.7 56.8 52.6 27.6 56.5 60.9 53.1 SVOCs 1,1'Biphenyl ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2,4,5Trichlorophenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2,4,6Trichlorophenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2,4Dichlorophenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2,4Dimethylphenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2,4Dinitrophenol ug/kg < 320 < 320 < 1600 < 320 NA < 1600 < 1600 < 320 < 310 < 1600 < 1600 < 320 < 320 NA < 1600 < 310 < 320 SVOCs 2,4Dinitrotoluene ug/kg < 130 < 130 < 640 < 130 NA < 620 < 620 < 130 < 120 < 640 < 620 < 130 < 130 NA < 630 < 120 < 130 SVOCs 2,6Dinitrotoluene ug/kg < 130 < 130 < 640 < 130 NA < 620 < 620 < 130 < 120 < 640 < 620 < 130 < 130 NA < 630 < 120 < 130 SVOCs 2Chloronaphthalene ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2Chlorophenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2Methylnaphthalene ug/kg < 13 < 13 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs 2Methylphenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 2Nitroaniline ug/kg < 130 < 130 < 640 < 130 NA < 620 < 620 < 130 < 120 < 640 < 620 < 130 < 130 NA < 630 < 120 < 130 SVOCs 2Nitrophenol ug/kg < 130 < 130 < 640 < 130 NA < 620 < 620 < 130 < 120 < 640 < 620 < 130 < 130 NA < 630 < 120 < 130 SVOCs 3,3'Dichlorobenzidine ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 3Nitroaniline ug/kg < 130 < 130 < 640 < 130 NA < 620 < 620 < 130 < 120 < 640 < 620 < 130 < 130 NA < 630 < 120 < 130 SVOCs 4,6Dinitro2methylphenol ug/kg < 320 < 320 < 1600 < 320 NA < 1600 < 1600 < 320 < 310 < 1600 < 1600 < 320 < 320 NA < 1600 < 310 < 320 SVOCs 4Bromophenyl phenyl ether ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 4Chloro3methylphenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 4Chloroaniline ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 4Chlorophenyl phenyl ether ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs 4Methylphenol ug/kg < 130 < 130 < 640 < 130 NA < 620 < 620 < 130 < 120 < 640 < 620 < 130 < 130 NA < 630 < 120 < 130 SVOCs 4Nitroaniline ug/kg < 130 < 130 < 640 < 130 NA < 620 < 620 < 130 < 120 < 640 < 620 < 130 < 130 NA < 630 < 120 < 130 SVOCs 4Nitrophenol ug/kg < 320 < 320 < 1600 < 320 NA < 1600 < 1600 < 320 < 310 < 1600 < 1600 < 320 < 320 NA < 1600 < 310 < 320 SVOCs Acenaphthene ug/kg < 13 < 13 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Acenaphthylene ug/kg < 13 < 13 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Acetophenone ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 Page 2 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED35 SED36 SED36 SED37 SED37 SED37DUP SED38 SED39 SED39 SED40 SED41 SED42 SED43 SED44 SED45 SED46 SED47 Depth 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 6 12 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/26/2019 11/26/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89400 pCi/g 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 0.00 # 16.5 ## 0.00 # 0.00 # 0.995 ## 5.94 ## 0.00 # 6.23 ## 2.83 ## 0.00 # 0.00 # 0.00 #

Radiological Uranium233/234 13 3310 pCi/g 1.59 4.40 1.50 4.88 2.04 2.33 3.26 1.86 1.90 1.72 6.12 47.5 8.86 5.86 4.02 3.18 2.57 Radiological Uranium235/236 8 39 pCi/g 0.0433 ## 0.210 0.0881 0.254 0.149 0.0456 ## 0.204 0.0122 ## 0.131 0.0394 ## 0.285 2.32 0.377 0.268 0.179 0.232 0.091 ##

Radiological Uranium238 14 179 pCi/g 1.66 2.38 1.05 1.78 1.62 1.38 1.68 1.70 1.24 1.41 2.23 12.1 2.62 2.20 2.15 1.46 1.98 Radiological Uranium234 ug/kg < 13.2 < 14.2 < 13.5 < 15.9 < 14.5 < 15.0 < 34.6 < 15.9 NA < 17.4 < 26.9 < 52.5 < 55.9 < 32.5 < 34.5 < 30.6 < 41.0 Radiological Uranium235 ug/kg 28.9 70.2 19.1 102 67.4 31.7 31.8 J 26.4 NA 28.4 17.8 J 156 862 238 100 48.9 44 J Radiological Uranium238 ug/kg 3630 3970 1990 4850 3930 2910 3380 3040 NA 3020 2390 7220 31300 9690 4920 3190 2560 Radiological Total Uranium ug/kg 3660 4040 2010 4950 4000 2940 3410 3070 NA 3050 2410 7380 32200 9930 5020 3240 2600 Chemical Fluoride mg/kg 80.1 153 99.1 451 127 178 576 222 NA 242 466 928 774 389 586 371 1540 Chemical Nitrate as N mg/kg < 0.50 < 0.50 0.55 < 0.50 < 0.50 < 0.50 0.66 < 0.50 < 0.5 < 0.50 0.63 0.83 0.50 < 0.50 0.82 0.62 0.59 Chemical Ammonia mg/kg 4.29 < 1.44 < 1.32 1.35 J 1.60 0.858 J 5.17 1.90 NA 1.65 J 2.68 J 5.15 J 14.9 3.04 J 7.90 3.41 6.02 Metals Aluminum ug/kg 22100 15300 16100 14800 18700 19000 23200 30400 NA 20800 27100 27500 15200 27000 19500 25100 22000 Metals Antimony ug/kg < 28 < 2.89 < 26.9 < 3.27 < 28.3 < 30 < 6.96 < 3.32 NA < 3.48 < 5.62 < 10.3 < 11.5 < 7.06 < 6.5 < 6.1 < 8.72 Metals Arsenic ug/kg 3.65 J 2.9 J 3.85 J 3.34 J 3.7 J 3.88 J 4.3 J 4.05 J NA 3.47 J 4.25 J 6.15 J 3.57 J 4.38 J 2.38 J 3.99 J 4.19 J Metals Barium ug/kg 178 106 123 122 134 142 206 167 NA 137 214 220 105 207 150 103 188 Metals Beryllium ug/kg 2.38 1.08 1.43 1.06 1.38 1.5 2.39 3 NA 1.47 2.01 1.67 J 0.858 J 2.32 1.32 J 1.29 J 1.32 J Metals Cadmium ug/kg < 0.701 < 0.723 < 0.673 < 0.817 < 0.706 < 0.749 < 1.74 < 0.83 NA < 0.87 < 1.4 < 2.58 < 2.87 < 1.76 < 1.62 < 1.53 < 2.18 Metals Calcium ug/kg 542 256 158 394 346 335 914 297 NA 429 754 1520 813 679 1170 620 737 Metals Chromium ug/kg 27.3 19.3 19.7 18.5 22.6 23 24.9 35.4 NA 26.5 29.4 31.4 15.6 29.5 23.6 26 27 Metals Cobalt ug/kg 19.1 9.08 11.7 6.86 8.53 8.88 14.3 13 NA 10 26.7 17.8 4.78 10.2 7.42 5.51 7.78 Metals Copper ug/kg 24.3 14.9 17.1 14.7 18.2 19.4 22.1 24.6 NA 19.6 25.8 30.9 16.7 21.7 18.9 19.6 22.3 Metals Iron ug/kg 35600 22000 30400 20500 25700 26800 18400 19900 NA 16100 24300 25100 8080 17100 11900 12100 13200 Metals Lead ug/kg 13.6 17.5 20.5 30.1 20.7 22 13.6 21.1 NA 20.4 21.9 105 16 18.8 40.4 33.8 43.1 Metals Magnesium ug/kg 4410 2320 2840 2010 2560 2640 2260 3330 NA 2700 2610 1910 1200 2080 2030 1620 1980 Metals Manganese ug/kg 819 260 322 215 219 230 498 210 NA 250 395 463 131 254 224 104 242 Metals Mercury ug/kg NA NA NA NA NA NA 72.9 J 56.8 J NA 55.5 J 72.4 J 119 J < 273 69.9 J 107 J < 141 106 J Metals Nickel ug/kg 13.7 8.87 9.48 8.54 10 10.2 13.9 16.9 NA 11.3 16.9 16.8 10.2 17.5 11.8 10.6 12.9 Metals Potassium ug/kg 2050 1200 1400 1050 1130 1160 1210 1400 NA 1420 1580 1150 684 1230 1010 946 1080 Metals Selenium ug/kg < 4.2 < 4.34 < 4.04 0.899 J < 4.24 < 4.5 < 10.4 < 4.98 NA < 5.22 < 8.43 < 15.5 < 17.2 < 10.6 < 9.74 < 9.15 < 13.1 Metals Silver ug/kg < 7.01 < 7.23 < 6.73 < 8.17 < 7.06 < 7.49 < 17.4 < 8.3 NA < 8.7 < 14 < 25.8 < 2.87 < 17.6 < 16.2 < 15.3 < 2.18 Metals Sodium ug/kg 58.9 50.9 57.9 47 51 60.2 83.1 J 59.9 NA 48.5 69 J 88.6 J 83.9 J 80.7 J 126 105 129 Metals Thallium ug/kg < 28 < 28.9 < 26.9 < 32.7 < 28.3 < 30 < 69.6 < 33.2 NA < 34.8 < 56.2 < 103 < 11.5 < 70.6 < 65 < 61 < 87.2 Metals Vanadium ug/kg 82.1 50.3 60.2 48.5 67.2 67.9 54.3 71.2 NA 62.7 85.8 95.1 36.5 68.8 49.9 68.1 50.3 Metals Zinc ug/kg 51.3 39 40.7 37.2 41.1 42 54.5 72.1 NA 49.2 68.9 81 53 56.1 49.1 38.6 49.6 SVOCs 1,1'Biphenyl ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2,4,5Trichlorophenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2,4,6Trichlorophenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2,4Dichlorophenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2,4Dimethylphenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2,4Dinitrophenol ug/kg < 320 < 320 < 320 < 320 < 320 < 310 < 1600 < 330 < 330 < 1600 < 330 < 320 < 310 < 320 < 320 < 320 < 320 SVOCs 2,4Dinitrotoluene ug/kg < 130 < 120 < 130 < 130 < 130 < 120 < 640 < 130 < 130 < 630 < 130 < 130 < 120 < 130 < 130 < 130 < 120 SVOCs 2,6Dinitrotoluene ug/kg < 130 < 120 < 130 < 130 < 130 < 120 < 640 < 130 < 130 < 630 < 130 < 130 < 120 < 130 < 130 < 130 < 120 SVOCs 2Chloronaphthalene ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2Chlorophenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2Methylnaphthalene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs 2Methylphenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 2Nitroaniline ug/kg < 130 < 120 < 130 < 130 < 130 < 120 < 640 < 130 < 130 < 630 < 130 < 130 < 120 < 130 < 130 < 130 < 120 SVOCs 2Nitrophenol ug/kg < 130 < 120 < 130 < 130 < 130 < 120 < 640 < 130 < 130 < 630 < 130 < 130 < 120 < 130 < 130 < 130 < 120 SVOCs 3,3'Dichlorobenzidine ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 3Nitroaniline ug/kg < 130 < 120 < 130 < 130 < 130 < 120 < 640 < 130 < 130 < 630 < 130 < 130 < 120 < 130 < 130 < 130 < 120 SVOCs 4,6Dinitro2methylphenol ug/kg < 320 < 320 < 320 < 320 < 320 < 310 < 1600 < 330 < 330 < 1600 < 330 < 320 < 310 < 320 < 320 < 320 < 320 SVOCs 4Bromophenyl phenyl ether ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 4Chloro3methylphenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 4Chloroaniline ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 4Chlorophenyl phenyl ether ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs 4Methylphenol ug/kg < 130 < 120 < 130 < 130 < 130 < 120 < 640 < 130 < 130 < 630 < 130 < 130 < 120 < 130 < 130 < 130 < 120 SVOCs 4Nitroaniline ug/kg < 130 < 120 < 130 < 130 < 130 < 120 < 640 < 130 < 130 < 630 < 130 < 130 < 120 < 130 < 130 < 130 < 120 SVOCs 4Nitrophenol ug/kg < 320 < 320 < 320 < 320 < 320 < 310 < 1600 < 330 < 330 < 1600 < 330 < 320 < 310 < 320 < 320 < 320 < 320 SVOCs Acenaphthene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Acenaphthylene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Acetophenone ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 Page 3 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED48 SED48DUP SED49 SED50 SED51 SED51 SED52 SED52 SED53 SED53 SED54 SED54 SED55 SED55 SED56 SED56DUP SED56 Depth 0 6 in 0 6 in 0 6 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 0 6 in 0 6 in 6 12 in Date 11/26/2019 11/26/2019 11/26/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Radiological Technetium99 19 89400 pCi/g 0.00 # 0.00 # 0.910 ## 0.00 # 4.89 ## 0.00 # 0.00 # 0.00 # 0.00 # 1.51 ## 0.00 # 6.19 ## 0.00 # 2.53 ## 0.00 # 0.00 # < 50.0 Radiological Uranium233/234 13 3310 pCi/g 2.43 4.59 3.64 2.10 1.27 1.77 1.88 2.15 2.06 1.78 1.48 2.05 1.62 2.02 2.82 1.89 1.89 Radiological Uranium235/236 8 39 pCi/g 0.0144 ## 0.215 0.104 ## 0.178 ## 0.0695 ## 0.308 ## 0.0494 ## 0.194 0.0708 ## 0.119 ## 0.120 ## 0.00 # 0.155 0.214 0.115 ## 0.0276 ## < 0.500 Radiological Uranium238 14 179 pCi/g 1.62 2.11 1.86 1.42 1.15 1.72 1.45 1.45 2.34 1.36 1.87 1.74 1.62 1.40 2.11 1.72 1.72 Radiological Uranium234 ug/kg < 25.8 < 29.6 < 37.2 < 31.4 < 31.2 < 28.9 < 21.8 < 23.3 < 17.3 < 14.1 < 37.1 < 25.3 < 18.3 < 16.0 < 17.2 < 18.8 < 16.4 Radiological Uranium235 ug/kg 40.3 37.4 J 81.9 72.1 28.2 J 20.6 J 26.8 J 29.5 J 29.2 24.7 22.6 J 26 J 25.4 J 23.2 23 J 24.5 J 21.7 J Radiological Uranium238 ug/kg 3140 2650 4840 4470 2610 2450 2530 2690 3200 3290 2870 2990 3450 3230 3100 3440 2970 Radiological Total Uranium ug/kg 3180 2690 4920 4540 2640 2470 2560 2720 3230 3310 2890 3020 3480 3250 3120 3460 2990 Chemical Fluoride mg/kg 806 1080 209 750 692 401 465 271 387 196 854 536 321 223 449 325 244 Chemical Nitrate as N mg/kg 0.63 0.70 0.58 0.53 0.72 0.51 < 0.50 0.61 < 0.50 < 0.50 0.63 0.68 < 0.50 < 0.50 0.52 0.74 < 0.50 Chemical Ammonia mg/kg 2.94 3.46 5.44 4.67 2.77 J 2.96 1.48 J 1.69 J 0.838 J 0.607 J 1.93 J 1.01 J < 1.88 < 1.76 < 1.89 < 1.96 0.690 J Metals Aluminum ug/kg 26400 20300 14300 22500 20300 19900 24300 23900 23100 24100 27300 26800 29400 29300 27000 27200 27300 Metals Antimony ug/kg < 5.01 < 5.68 < 7.62 < 6.52 < 5.8 < 5.66 < 4.58 < 4.27 < 3.46 < 31.3 < 7.44 < 5.3 < 3.66 < 3.04 < 3.6 < 3.47 < 3.26 Metals Arsenic ug/kg 3.85 J 3.38 J 2.12 J 3.64 J 2.25 J 3.3 J 4.4 J 3.09 J 3.44 J 3.75 J 6.54 J 4.47 J 4.6 J 4.56 4.54 J 4.87 J 5.26 Metals Barium ug/kg 154 146 69.2 178 98 191 144 146 146 151 144 124 153 159 166 170 190 Metals Beryllium ug/kg 1.35 1.19 J 0.727 J 1.62 J 1.17 J 1.93 1.6 1.93 1.77 2.52 1.61 J 1.64 1.88 3.39 2.21 2.28 4.25 Metals Cadmium ug/kg < 1.25 < 1.42 < 1.9 < 1.63 < 1.45 < 1.41 < 1.15 < 1.07 < 0.865 < 0.782 < 1.86 < 1.32 < 0.914 < 0.759 < 0.899 < 0.867 < 0.815 Metals Calcium ug/kg 408 435 258 1120 335 304 452 317 523 337 348 187 191 190 289 297 202 Metals Chromium ug/kg 26.9 23 13.9 25.7 25.1 26.1 29.7 34.6 30.2 32.5 34.5 33.4 36.4 35.9 33.4 34.1 33 Metals Cobalt ug/kg 7.53 6.39 3.57 10.5 5.3 11.5 7.14 10.3 8.5 13.7 6.78 7.1 8.47 15.6 8.86 9.36 13.4 Metals Copper ug/kg 26.4 26.1 11.3 25.8 19 20.8 20 19.6 23.5 21.8 25.6 21.1 24.3 26.8 25.4 26.4 28.6 Metals Iron ug/kg 12400 9320 6750 15300 9550 16100 17000 18500 15400 25200 18100 15800 19100 21900 17100 18700 21400 Metals Lead ug/kg 37.4 80 11.5 32.1 24.2 17 23.9 23.4 26.9 16.9 29.8 25.9 33.9 17 31.5 30 18.5 Metals Magnesium ug/kg 1670 1250 1040 2440 1940 2810 2700 3020 2760 3810 2390 2700 2920 3650 2740 3040 3960 Metals Manganese ug/kg 249 286 75.9 368 128 261 156 186 258 281 127 114 175 264 173 194 250 Metals Mercury ug/kg 107 J 118 J 87.2 J 108 J < 148 < 130 57.1 J 58.5 J 82.5 J 48.3 J 104 J 65.2 J 76.6 J 54.2 J 74.6 J 83.7 41 J Metals Nickel ug/kg 11.6 9.87 6.89 13.8 9.14 12 11.9 11.6 11.6 13.2 12.1 12.6 13.5 15.5 13.5 13.9 17.5 Metals Potassium ug/kg 929 708 621 1060 1120 1560 1500 850 1350 1150 1310 1410 1370 834 1170 1280 1150 Metals Selenium ug/kg < 7.51 < 8.51 < 11.4 < 9.78 2J < 8.48 < 6.87 < 6.4 1.26 J 1.2 J < 11.2 1.34 J < 5.48 1.24 J 1.3 J < 5.2 < 4.89 Metals Silver ug/kg < 12.5 < 1.42 < 1.9 < 16.3 < 1.45 < 14.1 < 11.5 < 10.7 < 8.65 < 7.82 < 18.6 < 13.2 < 9.14 < 7.59 < 8.99 < 8.67 < 8.15 Metals Sodium ug/kg 93.6 112 78.4 J 71.5 J 91.1 82.4 71.9 76.6 53.8 52.9 88 J 70.6 84.1 87 63.2 71.3 69.8 Metals Thallium ug/kg < 50.1 < 56.8 < 7.62 < 65.2 < 58 < 56.6 < 45.8 < 42.7 < 3.46 < 31.3 < 74.4 < 53 < 36.6 < 30.4 < 36 < 34.7 < 3.26 Metals Vanadium ug/kg 65.9 57.7 32.4 62.1 54.3 64.8 71.2 81 71 87.6 77.1 78.9 93.2 86.2 81.8 86.9 79.8 Metals Zinc ug/kg 46.4 42.1 27 67.3 34.7 55.7 51.5 54.7 52.7 63.9 54.1 53.4 56.1 70.8 55.6 59.1 83.5 SVOCs 1,1'Biphenyl ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2,4,5Trichlorophenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2,4,6Trichlorophenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2,4Dichlorophenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2,4Dimethylphenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2,4Dinitrophenol ug/kg < 320 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 SVOCs 2,4Dinitrotoluene ug/kg < 130 < 630 < 630 < 640 < 620 < 630 < 640 < 620 < 640 < 630 < 630 < 620 < 630 < 640 < 640 < 640 < 640 SVOCs 2,6Dinitrotoluene ug/kg < 130 < 630 < 630 < 640 < 620 < 630 < 640 < 620 < 640 < 630 < 630 < 620 < 630 < 640 < 640 < 640 < 640 SVOCs 2Chloronaphthalene ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2Chlorophenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2Methylnaphthalene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs 2Methylphenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 2Nitroaniline ug/kg < 130 < 630 < 630 < 640 < 620 < 630 < 640 < 620 < 640 < 630 < 630 < 620 < 630 < 640 < 640 < 640 < 640 SVOCs 2Nitrophenol ug/kg < 130 < 630 < 630 < 640 < 620 < 630 < 640 < 620 < 640 < 630 < 630 < 620 < 630 < 640 < 640 < 640 < 640 SVOCs 3,3'Dichlorobenzidine ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 3Nitroaniline ug/kg < 130 < 630 < 630 < 640 < 620 < 630 < 640 < 620 < 640 < 630 < 630 < 620 < 630 < 640 < 640 < 640 < 640 SVOCs 4,6Dinitro2methylphenol ug/kg < 320 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 SVOCs 4Bromophenyl phenyl ether ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 4Chloro3methylphenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 4Chloroaniline ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 4Chlorophenyl phenyl ether ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs 4Methylphenol ug/kg < 130 < 630 < 630 < 640 < 620 < 630 < 640 < 620 < 640 < 630 < 630 < 620 < 630 < 640 < 640 < 640 < 640 SVOCs 4Nitroaniline ug/kg < 130 < 630 < 630 < 640 < 620 < 630 < 640 < 620 < 640 < 630 < 630 < 620 < 630 < 640 < 640 < 640 < 640 SVOCs 4Nitrophenol ug/kg < 320 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 SVOCs Acenaphthene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Acenaphthylene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Acetophenone ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 Page 4 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED11 SED12 SED13 SED14 SED15 SED16 SED17 SED17DUP SED18 SED19 SED20 SED21 SED22 SED23 SED24 SED25* SED26*

Depth 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/16/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 7/16/2019 7/18/2019 7/18/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Anthracene ug/kg < 13 < 13 14 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Atrazine ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Benz(a)anthracene ug/kg < 13 < 13 170 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Benzaldehyde ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Benzo(a)pyrene ug/kg < 13 < 13 290 20 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 79 SVOCs Benzo(b)fluoranthene ug/kg < 13 < 13 630 37 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 150 SVOCs Benzo(g,h,i)perylene ug/kg < 13 < 13 190 18 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Benzo(k)fluoranthene ug/kg < 13 < 13 200 16 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Bis(2chloroethoxy)methane ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Bis(2chloroethyl)ether ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Bis(2chloroisopropyl)ether ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Bis(2ethylhexyl)phthalate ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Butyl benzyl phthalate ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Caprolactam ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Carbazole ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Chrysene ug/kg < 13 < 13 310 21 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Dibenz(a,h)anthracene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Dibenzofuran ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Diethyl phthalate ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Dimethyl phthalate ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Dinbutyl phthalate ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Dinoctyl phthalate ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Fluoranthene ug/kg < 13 < 13 570 36 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 81 SVOCs Fluorene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Hexachlorobenzene ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Hexachlorobutadiene ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Hexachlorocyclopentadiene ug/kg < 320 < 330 < 320 < 310 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 320 < 310 < 320 < 1600 SVOCs Hexachloroethane ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Indeno(1,2,3cd)pyrene ug/kg < 13 < 13 170 15 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Isophorone ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Naphthalene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Nitrobenzene ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs NNitrosodinpropylamine ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs NNitrosodiphenylamine ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Pentachlorophenol ug/kg < 320 < 330 < 320 < 310 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 320 < 310 < 320 < 1600 SVOCs Phenanthrene ug/kg < 13 < 13 130 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 64 SVOCs Phenol ug/kg < 66 < 67 < 64 < 64 < 67 < 65 < 67 < 64 < 66 < 67 < 66 < 66 < 66 < 65 < 64 < 64 < 320 SVOCs Pyrene ug/kg < 13 < 13 450 28 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 82 VOCs (1Methylethyl)Benzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,1,1Trichloroethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,1,2,2Tetrachloroethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,1,2Trichloroethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,1Dichloroethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,1Dichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,2,4Trichlorobenzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,2Dibromo3chloropropane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,2Dibromoethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,2Dichlorobenzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,2Dichloroethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,2Dichloropropane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,3Dichlorobenzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 1,4Dichlorobenzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs 2Butanone ug/kg < 25 180 < 24 < 17 < 15 < 16 < 19 < 19 < 18 45 45 < 25 32 < 28 < 17 NA NA VOCs 2Hexanone ug/kg < 13 < 11 < 12 < 8.7 < 7.6 < 8.2 < 9.6 < 9.5 < 8.9 < 10 < 13 < 12 < 12 < 14 < 8.3 NA NA VOCs 4Methyl2pentanone ug/kg < 13 < 11 < 12 < 8.7 < 7.6 < 8.2 < 9.6 < 9.5 < 8.9 < 10 < 13 < 12 < 12 < 14 < 8.3 NA NA VOCs Acetone ug/kg 32 110 30 28 < 15 < 16 < 19 < 19 < 18 48 110 67 88 91 25 NA NA VOCs Benzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Bromodichloromethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Bromoform ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Bromomethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Carbon disulfide ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Carbon tetrachloride ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Chlorobenzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Chloroethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA Page 5 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED27** SED28** SED29 SED29 SED29 SED30 SED30 SED31 SED31 SED32 SED32 SED33 SED33 SED33 SED34 SED34 SED35 Depth 0 6 in 0 6 in 0 6 in 6 12 in 12 16 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 1216 in 12 16 in 0 6 in 0 6 in Date 7/18/2019 7/18/2019 11/20/2019 11/20/2019 11/20/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/22/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Anthracene ug/kg < 13 110 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Atrazine ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Benz(a)anthracene ug/kg < 13 3400 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Benzaldehyde ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Benzo(a)pyrene ug/kg < 13 3000 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Benzo(b)fluoranthene ug/kg < 13 4600 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Benzo(g,h,i)perylene ug/kg < 13 1800 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Benzo(k)fluoranthene ug/kg < 13 1900 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Bis(2chloroethoxy)methane ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Bis(2chloroethyl)ether ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Bis(2chloroisopropyl)ether ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Bis(2ethylhexyl)phthalate ug/kg 91 270 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Butyl benzyl phthalate ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Caprolactam ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Carbazole ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Chrysene ug/kg < 13 3200 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Dibenz(a,h)anthracene ug/kg < 13 < 13 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Dibenzofuran ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Diethyl phthalate ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Dimethyl phthalate ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Dinbutyl phthalate ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Dinoctyl phthalate ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Fluoranthene ug/kg < 13 7100 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Fluorene ug/kg < 13 < 13 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Hexachlorobenzene ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Hexachlorobutadiene ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Hexachlorocyclopentadiene ug/kg < 320 < 320 < 1600 < 320 NA < 1600 < 1600 < 320 < 310 < 1600 < 1600 < 320 < 320 NA < 1600 < 310 < 320 SVOCs Hexachloroethane ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Indeno(1,2,3cd)pyrene ug/kg < 13 1600 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Isophorone ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Naphthalene ug/kg < 13 < 13 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Nitrobenzene ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs NNitrosodinpropylamine ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs NNitrosodiphenylamine ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Pentachlorophenol ug/kg < 320 < 320 < 1600 < 320 NA < 1600 < 1600 < 320 < 310 < 1600 < 1600 < 320 < 320 NA < 1600 < 310 < 320 SVOCs Phenanthrene ug/kg < 13 440 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 SVOCs Phenol ug/kg < 64 < 65 < 330 < 65 NA < 320 < 320 < 66 < 63 < 330 < 320 < 66 < 65 NA < 330 < 64 < 65 SVOCs Pyrene ug/kg < 13 5600 < 65 < 13 NA < 63 < 64 < 13 < 13 < 65 < 63 < 13 < 13 NA < 65 < 13 < 13 VOCs (1Methylethyl)Benzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,1,1Trichloroethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,1,2,2Tetrachloroethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,1,2Trichloroethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,1Dichloroethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,1Dichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,2,4Trichlorobenzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,2Dibromo3chloropropane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,2Dibromoethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,2Dichlorobenzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,2Dichloroethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,2Dichloropropane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,3Dichlorobenzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 1,4Dichlorobenzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs 2Butanone ug/kg NA NA < 21 < 18 < 24 26 25 < 16 < 17 38 76 < 20 45 NA 28 28 < 18 VOCs 2Hexanone ug/kg NA NA < 10 < 8.9 < 12 < 11 < 12 < 8.0 < 8.3 < 12 < 11 < 10 < 11 NA < 12 < 10 < 8.9 VOCs 4Methyl2pentanone ug/kg NA NA < 10 < 8.9 < 12 < 11 < 12 < 8.0 < 8.3 < 12 < 11 < 10 < 11 NA < 12 < 10 < 8.9 VOCs Acetone ug/kg NA NA 410 420 370 380 530 410 440 450 440 490 400 NA 200 180 390 VOCs Benzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Bromodichloromethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Bromoform ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Bromomethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Carbon disulfide ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Carbon tetrachloride ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Chlorobenzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Chloroethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 Page 6 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED35 SED36 SED36 SED37 SED37 SED37DUP SED38 SED39 SED39 SED40 SED41 SED42 SED43 SED44 SED45 SED46 SED47 Depth 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 6 12 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/26/2019 11/26/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Anthracene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Atrazine ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Benz(a)anthracene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 19 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Benzaldehyde ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 76 < 64 < 64 SVOCs Benzo(a)pyrene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 21 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Benzo(b)fluoranthene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 28 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Benzo(g,h,i)perylene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Benzo(k)fluoranthene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Bis(2chloroethoxy)methane ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Bis(2chloroethyl)ether ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Bis(2chloroisopropyl)ether ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Bis(2ethylhexyl)phthalate ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Butyl benzyl phthalate ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Caprolactam ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Carbazole ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Chrysene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 17 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Dibenz(a,h)anthracene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Dibenzofuran ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Diethyl phthalate ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Dimethyl phthalate ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Dinbutyl phthalate ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Dinoctyl phthalate ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Fluoranthene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 28 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Fluorene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Hexachlorobenzene ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Hexachlorobutadiene ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Hexachlorocyclopentadiene ug/kg < 320 < 320 < 320 < 320 < 320 < 310 < 1600 < 330 < 330 < 1600 < 330 < 320 < 310 < 320 < 320 < 320 < 320 SVOCs Hexachloroethane ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Indeno(1,2,3cd)pyrene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Isophorone ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Naphthalene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Nitrobenzene ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs NNitrosodinpropylamine ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs NNitrosodiphenylamine ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Pentachlorophenol ug/kg < 320 < 320 < 320 < 320 < 320 < 310 < 1600 < 330 < 330 < 1600 < 330 < 320 < 310 < 320 < 320 < 320 < 320 SVOCs Phenanthrene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 < 13 < 13 < 13 < 13 < 13 < 13 < 13 SVOCs Phenol ug/kg < 65 < 64 < 66 < 65 < 65 < 64 < 330 < 66 < 66 < 320 < 66 < 66 < 63 < 66 < 65 < 64 < 64 SVOCs Pyrene ug/kg < 13 < 13 < 13 < 13 < 13 < 13 < 65 < 13 < 13 < 64 27 < 13 < 13 < 13 < 13 < 13 < 13 VOCs (1Methylethyl)Benzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,1,1Trichloroethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,1,2,2Tetrachloroethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,1,2Trichloroethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,1Dichloroethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,1Dichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,2,4Trichlorobenzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,2Dibromo3chloropropane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,2Dibromoethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,2Dichlorobenzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,2Dichloroethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,2Dichloropropane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,3Dichlorobenzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 1,4Dichlorobenzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs 2Butanone ug/kg < 17 < 18 < 20 < 20 < 18 < 18 < 24 < 19 < 19 < 21 < 26 < 27 < 29 < 29 29 < 26 160 VOCs 2Hexanone ug/kg < 8.5 < 8.8 < 10 < 9.8 < 8.9 < 8.9 < 12 < 9.7 < 9.7 < 11 < 13 < 14 < 14 < 14 < 12 < 13 < 14 VOCs 4Methyl2pentanone ug/kg < 8.5 < 8.8 < 10 < 9.8 < 8.9 < 8.9 < 12 < 9.7 < 9.7 < 11 < 13 < 14 < 14 < 14 < 12 < 13 < 14 VOCs Acetone ug/kg 310 370 350 300 350 360 400 < 19 < 19 260 96 59 79 57 130 110 410 VOCs Benzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Bromodichloromethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Bromoform ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Bromomethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Carbon disulfide ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Carbon tetrachloride ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Chlorobenzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Chloroethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 Page 7 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED48 SED48DUP SED49 SED50 SED51 SED51 SED52 SED52 SED53 SED53 SED54 SED54 SED55 SED55 SED56 SED56DUP SED56 Depth 0 6 in 0 6 in 0 6 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 0 6 in 0 6 in 6 12 in Date 11/26/2019 11/26/2019 11/26/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result SVOCs Anthracene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Atrazine ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Benz(a)anthracene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Benzaldehyde ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Benzo(a)pyrene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Benzo(b)fluoranthene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Benzo(g,h,i)perylene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Benzo(k)fluoranthene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Bis(2chloroethoxy)methane ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Bis(2chloroethyl)ether ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Bis(2chloroisopropyl)ether ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Bis(2ethylhexyl)phthalate ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Butyl benzyl phthalate ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Caprolactam ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Carbazole ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Chrysene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Dibenz(a,h)anthracene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Dibenzofuran ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Diethyl phthalate ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Dimethyl phthalate ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Dinbutyl phthalate ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Dinoctyl phthalate ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Fluoranthene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Fluorene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Hexachlorobenzene ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Hexachlorobutadiene ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Hexachlorocyclopentadiene ug/kg < 320 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 SVOCs Hexachloroethane ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Indeno(1,2,3cd)pyrene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Isophorone ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Naphthalene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Nitrobenzene ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs NNitrosodinpropylamine ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs NNitrosodiphenylamine ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Pentachlorophenol ug/kg < 320 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 < 1600 SVOCs Phenanthrene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 SVOCs Phenol ug/kg < 65 < 330 < 320 < 330 < 320 < 320 < 330 < 320 < 330 < 330 < 330 < 320 < 320 < 330 < 330 < 330 < 330 SVOCs Pyrene ug/kg < 13 < 65 < 64 < 66 < 63 < 64 < 66 < 64 < 65 < 65 < 65 < 63 < 64 < 65 < 66 < 65 < 66 VOCs (1Methylethyl)Benzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,1,1Trichloroethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,1,2,2Tetrachloroethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,1,2Trichlor1,2,2trifluoroethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,1,2Trichloroethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,1Dichloroethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,1Dichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,2,4Trichlorobenzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,2Dibromo3chloropropane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,2Dibromoethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,2Dichlorobenzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,2Dichloroethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,2Dichloropropane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,3Dichlorobenzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 1,4Dichlorobenzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs 2Butanone ug/kg 39 23 < 28 190 43 < 27 31 < 26 < 22 < 21 42 < 25 < 19 < 20 < 21 < 19 < 14 VOCs 2Hexanone ug/kg < 11 < 10 < 14 < 13 < 13 < 13 < 12 < 13 < 11 < 10 < 13 < 13 < 9.7 < 9.8 < 10 < 9.7 < 7.1 VOCs 4Methyl2pentanone ug/kg < 11 < 10 < 14 < 13 < 13 < 13 < 12 < 13 < 11 < 10 < 13 < 13 < 9.7 < 9.8 < 10 < 9.7 < 7.1 VOCs Acetone ug/kg 220 280 300 370 330 180 100 < 26 < 22 170 330 39 < 19 200 220 23 < 14 VOCs Benzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Bromodichloromethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Bromoform ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Bromomethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Carbon disulfide ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Carbon tetrachloride ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Chlorobenzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Chloroethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 Page 8 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED11 SED12 SED13 SED14 SED15 SED16 SED17 SED17DUP SED18 SED19 SED20 SED21 SED22 SED23 SED24 SED25* SED26*

Depth 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 7/17/2019 7/17/2019 7/17/2019 7/17/2019 7/16/2019 7/17/2019 7/18/2019 7/18/2019 7/16/2019 7/17/2019 7/16/2019 7/15/2019 7/15/2019 7/16/2019 7/16/2019 7/18/2019 7/18/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chloroform ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Chloromethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs cis1,2Dichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs cis1,3Dichloropropene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Cyclohexane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Dibromochloromethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Dichlorodifluoromethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Ethylbenzene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Methyl acetate ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Methyl tertbutyl ether ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Methylcyclohexane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Methylene chloride ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Styrene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Tetrachloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 5.5 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Toluene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs trans1,2Dichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs trans1,3Dichloropropene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Trichloroethene ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Trichlorofluoromethane ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Vinyl chloride ug/kg < 6.3 < 5.6 < 6.1 < 4.4 < 3.8 < 4.1 < 4.8 < 4.8 < 4.5 < 5.2 < 6.5 < 6.2 < 6.1 < 7.1 < 4.2 NA NA VOCs Xylenes, Total ug/kg < 13 < 11 < 12 < 8.7 < 7.6 < 8.2 < 9.6 < 9.5 < 8.9 < 10 < 13 < 12 < 12 < 14 < 8.3 NA NA Page 9 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED27** SED28** SED29 SED29 SED29 SED30 SED30 SED31 SED31 SED32 SED32 SED33 SED33 SED33 SED34 SED34 SED35 Depth 0 6 in 0 6 in 0 6 in 6 12 in 12 16 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 1216 in 12 16 in 0 6 in 0 6 in Date 7/18/2019 7/18/2019 11/20/2019 11/20/2019 11/20/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/21/2019 11/22/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chloroform ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Chloromethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs cis1,2Dichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs cis1,3Dichloropropene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Cyclohexane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Dibromochloromethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Dichlorodifluoromethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Ethylbenzene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Methyl acetate ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Methyl tertbutyl ether ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Methylcyclohexane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Methylene chloride ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Styrene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Tetrachloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Toluene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs trans1,2Dichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs trans1,3Dichloropropene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Trichloroethene ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Trichlorofluoromethane ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Vinyl chloride ug/kg NA NA < 5.1 < 4.5 < 6.0 < 5.3 < 6.1 < 4.0 < 4.2 < 5.9 < 5.4 < 5.0 < 5.6 NA < 5.9 < 5.2 < 4.4 VOCs Xylenes, Total ug/kg NA NA < 10 < 8.9 < 12 < 11 < 12 < 8.0 < 8.3 < 12 < 11 < 10 < 11 NA < 12 < 10 < 8.9 Page 10 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED35 SED36 SED36 SED37 SED37 SED37DUP SED38 SED39 SED39 SED40 SED41 SED42 SED43 SED44 SED45 SED46 SED47 Depth 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 6 12 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in 0 6 in Date 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/22/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/25/2019 11/26/2019 11/26/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chloroform ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Chloromethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs cis1,2Dichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs cis1,3Dichloropropene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Cyclohexane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Dibromochloromethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Dichlorodifluoromethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Ethylbenzene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Methyl acetate ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Methyl tertbutyl ether ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Methylcyclohexane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Methylene chloride ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Styrene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Tetrachloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Toluene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs trans1,2Dichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs trans1,3Dichloropropene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Trichloroethene ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Trichlorofluoromethane ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Vinyl chloride ug/kg < 4.3 < 4.4 < 5.0 < 4.9 < 4.5 < 4.4 <6 < 4.9 < 4.9 < 5.3 < 6.5 < 6.8 < 7.2 < 7.2 < 6.1 < 6.5 < 6.9 VOCs Xylenes, Total ug/kg < 8.5 < 8.8 < 10 < 9.8 < 8.9 < 8.9 < 12 < 9.7 < 9.7 < 11 < 13 < 14 < 14 < 14 < 12 < 13 < 14 Page 11 of 12

Table A3 Sediment Analytical Results Westinghouse Columbia Fuel Fabrication Facility Hopkins, SC Sample ID SED48 SED48DUP SED49 SED50 SED51 SED51 SED52 SED52 SED53 SED53 SED54 SED54 SED55 SED55 SED56 SED56DUP SED56 Depth 0 6 in 0 6 in 0 6 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 6 12 in 0 6 in 0 6 in 0 6 in 6 12 in Date 11/26/2019 11/26/2019 11/26/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 11/27/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 12/2/2019 Group Analyte RUSL IUSL Unit Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result Result VOCs Chloroform ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Chloromethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs cis1,2Dichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs cis1,3Dichloropropene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Cyclohexane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Dibromochloromethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Dichlorodifluoromethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Ethylbenzene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Methyl acetate ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 12 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Methyl tertbutyl ether ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Methylcyclohexane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Methylene chloride ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Styrene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Tetrachloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Toluene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 8.7 < 6.7 10 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs trans1,2Dichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs trans1,3Dichloropropene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Trichloroethene ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Trichlorofluoromethane ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Vinyl chloride ug/kg < 5.3 < 5.2 < 7.1 < 6.3 < 6.6 < 6.7 < 6.2 < 6.4 < 5.4 < 5.2 < 6.6 < 6.3 < 4.9 < 4.9 < 5.2 < 4.8 < 3.5 VOCs Xylenes, Total ug/kg < 11 < 10 < 14 < 13 < 13 < 13 < 12 < 13 < 11 < 10 < 13 < 13 < 9.7 < 9.8 < 10 < 9.7 < 7.1 Notes: DUP field duplicate sample

• sludge sample collected from the Sanitary Lagoon

• • sludge sample collected from the East Lagoon RUSL Residential Use Screening Level (NUREG 1757, Appendix H)

IUSL Industrial Use Screening Level (NUREG 1757, Appendix H) pCi/g picocuires per gram

1. value is reported as a negative number

1. 1. value is below minimum detectable concentration Bold concentrations indicate detections Concentrations in shaded cells exceed their RUSL/IUSL ug/kg micrograms per kilogram NA not analyzed mg/kg milligrams per kilogram SVOCs semivolatile organic compounds VOCs volatile organic compounds Page 12 of 12

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Appendix B Leidos Technical Basis Document AECOM

=

Background===

In July of 2019, the Westinghouse Columbia Fuel Fabrication Facility (WCFFF) collected 18 surficial (top six inches) sediment samples from areas of the site, including the on-site ditches, Sanitary Lagoon, East Lagoon, and Mill Creek. It was expected that samples from the Sanitary Lagoon, and East Lagoon would contain uranium (U), as these are active work areas within the WCFFF, and are known to be impacted. Additionally, one location within a storm water ditch, two locations in Upper Sunset Lake and one location in Lower Sunset Lake were identified to contain U concentrations above the residential use screening level (NUREG 1757, Vol. 2, Rev. 1, Appendix H), but below industrial use screening levels. These samples were collected from locations on the WCFFF property; therefore, the identification of U concentrations in the sediment does not pose any undue risk to public health and safety.

A follow up sediment sampling campaign was conducted in November of 2019. Westinghouse collected sediment samples from Mill Creek along ten transects with an additional 28 sediment sampling locations, to obtain additional sediment quality data. Generally, there were three sample locations per transect; two within a few feet of the edges of the Mill Creek floodplain and one in the presumed middle of the flow channel. In cases where Mill Creek is significantly wider due to impoundment, four sediment sample locations were collected along the transect. Sediment samples above the Entrance Dike (SED 51 through SED-56) and below the Lower Sunset Lake Dike (SED-29 through SED-37) were collected to a total depth of 12 inches. In a few locations, the sample core was up to 16 inches in length.

The sediment transect sampling locations are shown on Figure 16 from the Final Remedial Investigation (RI) Data Summary Report (LTR-RAC-20-62), and are presented in Figure 1 of this report.

Upstream Areas Sediment samples were collected at eight locations to assess background sediment quality. These sediment samples were collected at locations that are upstream of the surface water flow from the site, where only naturally occurring radioactivity is expected to be present in the sediment.

Locations SED-11 and SED-12 were each collected from a storm water ditch and are representative of the naturally occurring sediment within the storm water ditches as it enters the WCFFF site boundary.

Locations SED-51, SED-52, and SED-53 were collected just upstream of the site Entrance Dike, and locations SED-54, SED-55, and SED-56 were collected well upstream within the flow path of Mill Creek. These six sediment sampling locations are representative of the naturally occurring background sediment within Mill Creek, which Upper and Lower Sunset Lakes are part of.

2

FIGURE 1 - Sediment Transect Sampling Locations 3

Site Features of Interest Sediment samples were collected from eight locations across the site in storm water ditches. These locations were selected as they best represent the initial areas where contaminants from the site could potentially migrate. Sediment sample locations SED-13 through SED-18 are representative of the flow path of storm water across the site as it travels towards Mill Creek. Sediment samples SED-23 and SED-24 were collected from a surface water body known as the Gator Pond.

Sludge from the Sanitary Lagoon (SED-25 and SED-26), and the East Lagoon (SED-27 and SED-

28) were also sampled; however these areas are known to be impacted and represent active wastewater treatment areas of the site.

Upper and Lower Sunset Lakes Water depths in Upper and Lower Sunset Lakes are more profound than the non-impounded sections of Mill Creek. In the case of Lower Sunset Lake, a boat was the primary method used to reach each sampling location. In cases where water is shallow (i.e. SED-34, Figure 1) and not accessible by boat, hip waders were used to access the sediment sampling location. Previously collected sediment samples (SED-19 through SED-22) from this area of the site were surficial collections only.

Downstream Areas Three of the sediment sampling transects (Figure 1) are downstream of the Lower Sunset Lake dike. This portion of Mill Creek is heavily forested, lowland swamp with minimal flow. The majority of the flow in Mill Creek through the Westinghouse property is by way of the diversion canal along the southern property boundary.

The Exit Dike (Figure 1) is located just north of the diversion canal and contains a drainage pipe that connects the water flowing from the section of Mill Creek that flows through Upper and Lower Sunset Lakes to the water flowing down the man-made diversion canal. Although not fully impounding, the depth of the surface water in Mill Creek appears to increase downstream closer to the Exit Dike.

Sampling Results Sediment samples were sent to an off-site laboratory for analysis of U, Tc-99, Fluoride, and Nitrate. Reported Fluoride and Nitrate results were below the EPA Regional Screening Levels for residential use, therefore comparisons to industrial screening levels was not necessary.

The radiological screening levels in Table 1 are based on single contaminant concentrations for each isotope. When multiple radionuclides are present a sum of fractions (SOF) approach should be used to assess compliance with the concentration limit. The SOF for each unique sample is calculated using the following equation:

234 235 238 99

= + + +

,234 ,235 ,238 ,99 4

The values in Table 1 represent soil concentrations of individual radionuclides, using generally accepted exposure parameters, that would be deemed in compliance with the dose limits specified in 10 CFR 20.1402 (e.g. equivalent to 25 mrem/year under Residential Use).

Table 1: Residential and Industrial Use Screening Levels Contaminant Residential Screening Level Industrial Screening Level Basis of Screening Level NUREG 1757, Vol. 1-2 ,

Uranium - 234 13 pCi/g (0.002 mg/Kg) 3,310 pCi/g (0.5 mg/kg)

Appendix H1 NUREG 1757, Vol. 1-2 ,

Uranium - 235 8 pCi/g (3.704 mg/Kg) 39 pCi/g (18 mg/kg)

Appendix H1 NUREG 1757, Vol. 1-2 ,

Uranium - 238 14 pCi/g (41.667 mg/Kg) 179 pCi/g (533 mg/kg)

Appendix H1 Calculated based on NUREG Total Uranium 12.69 pCi/g (5.320 mg/Kg) 2,933 pCi/g (1,230 mg/kg) 1757, Vol. 2, Rev. 1-2, Appendix H2 NUREG 1757 Vol. 1-2 ,

Technetium - 99 19 pCi/g (1.110 E -03 mg/Kg) 89,400 pCi/g (5.2 mg/Kg)

Appendix H1 The Residential Use Screening Levels (RUSLs) were determined using highly conservative assumptions to develop an exposure scenario where it is assumed that a person would construct a house on the property, live on the property, drink the groundwater, and eat produce farmed on the property. For this reason, the RUSLs are provided for reference, but samples collected from within the CFFF property boundary will ultimately be compared to the Industrial Use Screening Level (IUSL), which is representative of the current and future use of the property.

The IUSLs are also based on conservative assumptions, but these assumptions better represent the current and future use of the WCFFF, as it is assumed that the industrial worker will not live on the property, or engage in the consumption of any food or water produced on the facility property.

The sediment sample analytical results from the July 2019 sampling event are provided for reference in Table 2, along with the calculated SOF for both Residential and Industrial use scenarios.

5

Table 2: June 2019 Sediment Sampling Results Analyte (pCi/g) SOF SOF Sample ID U-234 U-235 U-238 Tc-99 Resid. Ind.

SED-11 1.14 0.00 0.74 0.002 0.14 0.00 SED-12 0.93 0.061 1.17 0.002 0.16 0.01 SED-13 1.67 0.161 1.33 0.002 0.24 0.01 SED-14 1.42 0.031 0.39 0.02 0.14 0.00 SED-15 2.58 0.18 2.05 5.62 0.66 0.02 SED-16 14.90 0.68 2.77 4.94 1.69 0.04 SED-17 0.66 0.02 0.30 7.50 0.47 0.00 SED-18 0.22 0.021 0.30 0.002 0.04 0.00 SED-19 32.50 2.30 8.18 6.28 3.70 0.11 SED-20 62.50 3.12 14.90 0.00 2 6.26 0.18 SED-21 1.86 0.10 1 1.96 4.12 0.51 0.01 SED-22 117.00 4.98 28.00 0.00 2 11.62 0.32 SED-23 1.35 0.001 1.69 50.80 2.90 0.01 SED-24 1.14 0.06 1 0.94 35.80 2.05 0.01 SED-25 907.00 41.10 149.00 8.55 86.00 2.16 SED-26 222.00 11.00 46.90 1.68 21.89 0.61 SED-27 225.00 11.90 37.40 0.00 2 21.47 0.58 SED-28 254.00 12.40 44.60 5.75 24.58 0.64 1

Value is estimated, result below detection limit 2

Negative values below lab bkg, set to zero The sediment samples that were collected are below the applicable IUSLs, with the exception of SED-25, which was collected from the Sanitary Lagoon, an area of the site that is known to be impacted. The Sanitary Lagoon is an earthen lagoon within a controlled and fenced area of the facility, and further investigation is planned under the DHEC Consent Agreement and associated Remedial Investigation Work. Public access to this area of the site is restricted. In addition, the sample location itself represents an inaccessible area as it is located in the Sanitary Lagoon sludge that is covered by several feet of treated sanitary wastewater awaiting chlorine disinfection. This sample does not represent undue risk to the workforce at this time, but routine dose monitoring should be performed for personnel who work in this area.

Samples SED-23 and SED-24 (both collected from the Gator Pond) were identified to be above the RUSL due to Tc-99. Sediment sample locations SED-26 (also collected from the Sanitary 6

Lagoon), SED-27 and SED-28 (both collected from the East Lagoon) were also identified to contain concentrations of U above the RUSL, as expected.

Sediment sampling location SED-16 was identified to be above the RUSL, however this area is below the applicable IUSL, and appears to be isolated, as U concentration in downstream sediment samples SED-17, and SED-18 were below RUSL.

Three samples from Mill Creek were found to be above the RUSL; SED-19 and SED-20 were collected in Upper Sunset Lake upstream of the Upper Sunset Lake Dike, and sediment sample SED-22 was collected from Lower Sunset Lake upstream of the Lower Sunset Lake Dike. It is important to note that these samples represent sediment that is contained on the WCFFF property and the RUSL is used for reference only. The sample results are below the IUSL, which is a more appropriate comparison as these samples are representative of an industrial use area. However, out of prudence to public and environmental health and safety, additional investigations were performed within Mill Creek, both up and down stream. The sediment sample analytical results from the November 2019 sampling event are provided in Table 3.

7

Table 3: November 2019 Sediment Transect Sampling Results Analyte (pCi/g) SOF SOF Sample ID U-234 U-235 U-238 Tc-99 Resid. Ind.

SED-29-0-6 6.23 0.31 2.51 0.00 2 0.70 0.02 SED-29-06-12 1.81 0.21 1.55 0.002 0.28 0.01 SED-29-12-16 1.23 0.18 1.16 0.002 0.20 0.01 SED-30-0-6 5.71 0.19 2.51 2.431 0.77 0.02 SED-30-6-12 1.41 0.031 1.28 0.002 0.20 0.01 SED-31-0-6 2.81 0.071 1.75 0.961 0.40 0.01 SED-31-6-12 2.96 0.111 1.69 0.002 0.36 0.01 SED-32-0-6 3.71 0.101 2.00 5.061 0.71 0.01 SED-32-6-12 10.00 0.47 3.28 0.002 1.06 0.03 SED-33-0-6 5.06 0.39 2.52 0.002 0.62 0.03 SED-33-6-12 1.27 0.101 1.56 0.002 0.22 0.01 SED-33-12-16 1.06 0.051 1.09 0.002 0.17 0.01 SED-34-0-6 3.13 0.131 1.81 0.002 0.39 0.01 SED-34-6-12 2.93 0.051 1.73 0.002 0.36 0.01 SED-35-0-6 2.26 0.18 1.59 0.002 0.31 0.01 SED-35-6-12 1.59 0.041 1.66 0.002 0.25 0.01 SED-36-0-6 4.40 0.21 2.38 0.002 0.53 0.02 SED-36-6-12 1.50 0.09 1.05 0.002 0.20 0.01 SED-37-0-6 4.88 0.25 1.78 0.002 0.53 0.02 SED-37-6-12 2.04 0.15 1.62 0.002 0.29 0.01 SED-38 0 3.26 0.20 1.68 16.501 1.26 0.02 SED-39 0"-6" 1.86 0.011 1.70 0.002 0.27 0.01 SED-40 0"-6" 1.90 0.13 1.24 0.002 0.25 0.01 SED-41 0"-6" 1.72 0.041 1.41 1.001 0.29 0.01 SED-42 0"-6" 6.12 0.29 2.23 5.941 0.98 0.02 SED-43 0"-6" 47.50 2.32 12.10 0.002 4.81 0.14 SED-44 0"-6" 8.86 0.38 2.62 6.231 1.24 0.03 SED-45 0"-6" 5.86 0.27 2.20 2.831 0.79 0.02 SED-46 0"-6" 4.02 0.18 2.15 0.002 0.49 0.02 SED-47 0"-6" 3.18 0.23 1.46 0.002 0.38 0.02 SED-48 0"-6" 2.57 0.091 1.98 0.002 0.35 0.01 SED-48-DUP 0"-6" 2.43 0.011 1.62 0.002 0.30 0.01 SED-49 0"-6" 4.59 0.22 2.11 0.002 0.53 0.02 SED-50 0"-6" 3.64 0.101 1.86 0.911 0.47 0.01 1

Value is estimated, result below minimum detectable concentration 2

Negative values below laboratory analytical background are set to zero Sediment samples SED-38, SED-43, and SED-44 (Figure 1) from the November 2019 sediment sampling event also contained U concentrations above the RUSL. As can be seen in Figure 1, SED-19 is located near the flow path of storm water runoff from the facility. SED-20, SED-43, 8

and SED-44 are just upstream of the Upper Sunset Lake Dike, and SED-22 and SED-38 are just upstream of the Lower Sunset Lake Dike. These results seem to indicate that the dikes are serving as effective impounding barriers. The samples containing uranium (U) noted above were located near the northern edges of Upper and Lower Sunset Lakes closest to the facility. Samples collected farther from the edge of the lakes contained lower or non-detectable U concentrations. This observation coupled with the lack of U within the upper surficial groundwater immediately up-gradient of Upper Sunset Lake and Lower Sunset Lake indicates that the U was transported to the lakes via overland flow. Concentrations above the residential-use screening level (RUSL) were not detected in samples collected up-gradient of the entrance dike nor down-gradient of the Lower Sunset Lake Dike, indicating that the extent of the elevated U is confined between these structures.

The dikes restrict the flow of surface water causing a pooling effect, which would encourage any suspended solids to settle out upstream of the dikes.

As there are no current activities that would be a likely source of the detected U, transport of impacted soil and sediments from historical events are the likely source of radiological impacts.

The only known historical event that may have resulted in U being transported to the on-site Upper and Lower Sunset Lake sediments is the West Lagoon 1 release which occurred in October 1971 and was documented in the 1977 NRC Environmental Impact Appraisal (EIA). The 1977 NRC EIA also concluded that the causeway/dike structures restricted the potential impact of the West Lagoon 1 release.

Sample location SED-32 was sampled at both the surface (top 6 inches) and subsurface interval (6-12 inches below the surface). The surface interval contained radiological concentrations below the RUSL, but the subsurface interval contained radiological concentrations above the RUSL.

While this location is still on the WCFFF property and is representative of an industrial use area, it is important to note that subtraction of naturally occurring, background radiation has not been performed. If background radioactivity is subtracted from the sample, it falls below the RUSL.

In order to establish the level of naturally occurring, background radioactivity in the sediment of Mill Creek, sediment samples from two transects were collected upstream of the WCFFF from areas that have not been influenced by activities at the facility. Sediment sample locations SED-51 through SED-56 were selected as areas representative of background conditions within Mill Creek. These locations are protected from potential back flow by the Entrance Dike and are representative of the naturally occurring levels of U found in the surrounding soil of the area. The results of these background sediment sample locations are provided in Table 4.

9

Table 4: Background Sediment Sampling Results Analyte (pCi/g) SOF SOF Sample ID U-234 U-235 U-238 Resid. Ind.

SED-51 0"-6" 2.1 ND 1.42 0.26 0.01 SED-51 6"-12" 1.27 ND 1.15 0.18 0.01 SED-52 0"-6" 1.77 ND 1.72 0.26 0.01 SED-52 6"-12" 1.88 ND 1.45 0.25 0.01 SED-53 0"-6" 2.15 0.194 1.45 0.29 0.01 SED-53 6"-12" 2.06 ND 2.34 0.33 0.01 SED-54 0"-6" 1.78 ND 1.36 0.23 0.01 SED-54 6"-12" 1.48 ND 1.87 0.25 0.01 SED-55 0"-6" 2.05 ND 1.74 0.28 0.01 SED-55 6"-12" 1.62 0.155 1.62 0.26 0.01 SED-56 0"-6" 2.02 0.214 1.4 0.28 0.01 SED-56 6"-12" 1.89 ND 1.72 0.27 0.01 SED-56-DUP 0"-6" 2.82 ND 2.11 0.37 0.01 Ave Surface 1.98 0.07 1.52 0.27 Ave Sub-Surface 1.70 0.03 1.69 0.25 Total Average 1.84 0.05 1.60 0.26 As can be seen from Table 4 above, the naturally occurring background levels of U in the sediment represent approximately 1/4 of the RUSL. Tc-99 is not a naturally occurring nuclide; therefore it is not expected to be found in background samples. Tc-99 concentrations within the sediment sample analytical results from these locations were below the Minimum Detectable Concentration (MDC).

Since U background represents a significant portion of the RUSL, background subtraction is warranted. For the sediment samples with analytical results above the RUSL, the average U background value was subtracted to produce a net sample result. The net sample result, and corresponding SOF values are presented in Table 5.

10

Table 5: RSL Exceedances With Adjustments to Account for Natural Background Concentrations of U Analyte (pCi/g) SOF SOF Sample ID U-234 U-235 U-238 Tc-99 Resid. Ind.

SED-19 30.66 2.25 6.58 6.28 1 3.44 0.10 SED-20 60.66 3.07 13.30 0.002 6.00 0.17 SED-22 115.16 4.93 26.40 0.002 11.36 0.31 SED-32-6-12 8.16 0.42 1.68 0.002 0.80 0.02 SED-38 0 1.42 0.16 0.08 16.501 1.00 0.01 SED-43 0"-6" 45.66 2.27 10.50 0.002 4.55 0.13 SED-44 0"-6" 7.02 0.33 1.02 6.231 0.98 0.02 1

Value is estimated, result below minimum detectable concentration 2

Negative values below laboratory analytical background are set to zero As can be seen from Table 5 above, sediment sample locations SED-32 and SED-44 net sample results are found to be below the RUSL when adjusted for background U concentrations in the sediment.

Sediment sample locations SED-19, SED-20, SED-22, SED-38, and SED-43 while above RUSL, do not exceed the IUSL. The IUSL is an appropriate screening level for areas of the WCFFF that are representative of industrial use.

It is also important to note that all sediment samples collected downstream of the Lower Sunset Lake Dike are below the RUSL when adjusted for background. Sediment sample locations SED-29 through SED-31 represent the area just upstream of the Exit Dike and the WCFFF boundary.

It would be expected that if impacted sediment were to migrate out of Lower Sunset Lake that the area upstream of the Exit Dike would be a likely settling point. The average Residential SOF of these three samples is 0.42 and the background adjusted net Residential SOF is 0.15, indicating that there is no concern for the potential migration of impacted sediment from the WCFFF.

Conclusions In total, 63 unique sediment samples were collected from 46 locations across the WCFFF and within Mill Creek crossing the Southern portion of the WCFFF. Several upstream areas were sampled to establish the naturally occurring background U concentrations that would be expected in every sample. Sediment samples were collected from multiple transects in Upper and Lower Sunset Lake where migration of contamination may occur in the sediment. Sediment samples were also collected from several sections of Mill Creek downstream of the Lower Sunset Lake Dike where no migration of impacted sediment was expected to be observed.

A review of the sediment analytical results concludes that naturally occurring U is expected to be present in the sediment samples and that the background levels are significant enough to warrant background subtraction. Areas of U impact above the RUSL were observed in Upper and Lower Sunset Lake, but the detected levels of sediment impact do not pose a risk to public health and safety, the environment, or to the workers at the WCFFF. The sediment impacts above RUSL 11

were located just upstream of the dikes in both Upper and Lower Sunset Lakes. This supports the conclusion that the dikes are functioning as effective impounding barriers. Fast moving water can carry solids downstream in a suspended form. Restricting the flow of surface water causes pooling, which encourages suspended solids to settle out of the water. Therefore, it is expected that the sediment analytical results upstream of the Lower Sunset Lake Dike represents the furthest downstream extent of sediment impact from the WCFFF.

Most importantly, no contamination above the RUSL was identified downstream of the Lower Sunset Lake Dike. Sediment samples collected upstream of the Exit Dike, and subsequently the WCFFF property boundary, indicate that there is no concern for the potential migration of impacted sediment from the facility. Should elevated sample results be identified in the future, or isolated incidents such as environmental releases raise the potential for the migration of contamination, additional monitoring and potentially remedial action may be necessary. However, the only action that is required at this time is the continued environmental monitoring of Mill Creek as part of the WCFFF periodic environmental monitoring program, and the continued implementation of the DHEC Consent Agreement and associated Remedial Investigation Work.

References NRC 2006. Consolidated Decommissioning Guidance: Decommissioning Process for Materials Licensees, NUREG-1757, Vol. 1, Rev. 2.

NRC 2006. Consolidated Decommissioning Guidance: Characterization, Survey, and Determination of Radiological Criteria, NUREG-1757, Vol. 2, Rev. 1.

12

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Appendix C Hydraulic Characterization Results AECOM

10.

1.

Displacement (ft) 0.1 0.01 0.001

0. 30. 60. 90. 120. 150.

Time (sec)

W-13R FALLING HEAD Data Set: O:\...\W-13R_cks_Falling.aqt Date: 02/14/20 Time: 10:55:47 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-13R AQUIFER DATA Saturated Thickness: 21.71 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-13R)

Initial Displacement: 4.4 ft Static Water Column Height: 8.71 ft Total Well Penetration Depth: 8.46 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 9.804 ft/day y0 = 2.157 ft

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1.

Displacement (ft) 0.1 0.01

0. 30. 60. 90. 120.

Time (sec)

W-13R RISING HEAD Data Set: O:\...\W-13R_cks_Rising.aqt Date: 02/14/20 Time: 10:56:09 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-13R AQUIFER DATA Saturated Thickness: 21.71 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-13R)

Initial Displacement: 4.4 ft Static Water Column Height: 8.71 ft Total Well Penetration Depth: 8.46 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 10.09 ft/day y0 = 2.224 ft

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1.

Displacement (ft) 0.1 0.01

0. 30. 60. 90. 120. 150. 180.

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W-15 FALLING HEAD Data Set: O:\...\W-15_cks_Falling.aqt Date: 02/14/20 Time: 10:56:32 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-15 AQUIFER DATA Saturated Thickness: 18.33 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-15)

Initial Displacement: 4.4 ft Static Water Column Height: 8.99 ft Total Well Penetration Depth: 8.74 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 5.56 ft/day y0 = 2.475 ft

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1.

Displacement (ft) 0.1 0.01

0. 30. 60. 90. 120. 150. 180. 210. 240.

Time (sec)

W-15 RISING HEAD Data Set: O:\...\W-15_cks_Rising.aqt Date: 02/14/20 Time: 10:56:47 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-15 AQUIFER DATA Saturated Thickness: 18.33 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-15)

Initial Displacement: 4.4 ft Static Water Column Height: 8.99 ft Total Well Penetration Depth: 8.74 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 5.527 ft/day y0 = 1.938 ft

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W-39 FALLING HEAD Data Set: O:\...\W-39_cks_Falling.aqt Date: 02/14/20 Time: 10:57:25 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-39 AQUIFER DATA Saturated Thickness: 16.82 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-39)

Initial Displacement: 4.4 ft Static Water Column Height: 9. ft Total Well Penetration Depth: 9. ft Screen Length: 9. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 3.329 ft/day y0 = 0.275 ft

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Displacement (ft) 0.1 0.01

0. 30. 60. 90. 120. 150. 180.

Time (sec)

W-39 RISING HEAD Data Set: O:\...\W-39_cks_Rising.aqt Date: 02/14/20 Time: 10:58:40 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-39 AQUIFER DATA Saturated Thickness: 16.82 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-39)

Initial Displacement: 4.4 ft Static Water Column Height: 9. ft Total Well Penetration Depth: 9. ft Screen Length: 9. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 2.784 ft/day y0 = 0.1843 ft

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Displacement (ft) 0.1 0.01

0. 60. 120. 180. 240. 300. 360. 420. 480. 540. 600.

Time (sec)

W-48 FALLING HEAD Data Set: O:\...\W-48_cks_Falling.aqt Date: 02/14/20 Time: 10:59:17 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-48 AQUIFER DATA Saturated Thickness: 17.61 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-48)

Initial Displacement: 4.4 ft Static Water Column Height: 17.14 ft Total Well Penetration Depth: 16.89 ft Screen Length: 10. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 0.6033 ft/day y0 = 0.4654 ft

1.

Displacement (ft) 0.1 0.01

0. 60. 120. 180. 240. 300. 360. 420. 480. 540. 600.

Time (sec)

W-48 RISING HEAD Data Set: O:\...\W-48_cks_Rising.aqt Date: 02/14/20 Time: 11:00:08 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-48 AQUIFER DATA Saturated Thickness: 17.61 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-48)

Initial Displacement: 4.4 ft Static Water Column Height: 17.14 ft Total Well Penetration Depth: 16.89 ft Screen Length: 10. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 0.5169 ft/day y0 = 0.4119 ft

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0.1 Displacement (ft) 0.01 0.001

0. 13.3 26.7 40.

Time (sec)

W-60 FALLING HEAD Data Set: O:\...\W-60_cks_Falling_early data.aqt Date: 02/14/20 Time: 11:00:39 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-60 AQUIFER DATA Saturated Thickness: 17.83 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-60)

Initial Displacement: 4.4 ft Static Water Column Height: 17.83 ft Total Well Penetration Depth: 18.35 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 133.7 ft/day y0 = 1.161 ft

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Displacement (ft) 0.1 0.01 0.001

0. 15. 30.

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W-60 RISING HEAD Data Set: O:\...\W-60_cks_Rising.aqt Date: 02/14/20 Time: 11:01:05 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-60 AQUIFER DATA Saturated Thickness: 17.83 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-60)

Initial Displacement: 4.4 ft Static Water Column Height: 17.83 ft Total Well Penetration Depth: 18.35 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 116.7 ft/day y0 = 1.25 ft

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0.1

0. 30. 60. 90.

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W-61 FALLING HEAD Data Set: O:\...\W-61_cks_Falling.aqt Date: 02/14/20 Time: 11:01:29 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-61 AQUIFER DATA Saturated Thickness: 21.3 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-61)

Initial Displacement: 4.4 ft Static Water Column Height: 7.73 ft Total Well Penetration Depth: 17.73 ft Screen Length: 10. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 5.085 ft/day y0 = 3.203 ft

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Displacement (ft) 1.

0.1

0. 45. 90.

Time (sec)

W-61 RISING HEAD Data Set: O:\...\W-61_cks_Rising.aqt Date: 02/14/20 Time: 11:01:56 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-61 AQUIFER DATA Saturated Thickness: 21.3 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-61)

Initial Displacement: 4.4 ft Static Water Column Height: 7.73 ft Total Well Penetration Depth: 17.73 ft Screen Length: 10. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 5.153 ft/day y0 = 2.29 ft

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W-94 FALLING HEAD Data Set: O:\...\W-94_cks_Falling.aqt Date: 02/14/20 Time: 10:52:19 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-94 AQUIFER DATA Saturated Thickness: 19.62 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-94)

Initial Displacement: 4.4 ft Static Water Column Height: 20.02 ft Total Well Penetration Depth: 19.77 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 4.667 ft/day y0 = 2.516 ft

10.

1.

Displacement (ft) 0.1 0.01

0. 60. 120. 180. 240.

Time (sec)

W-94 RISING HEAD Data Set: O:\...\W-94_cks_Rising.aqt Date: 02/14/20 Time: 10:52:37 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-94 AQUIFER DATA Saturated Thickness: 19.62 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-94)

Initial Displacement: 4.4 ft Static Water Column Height: 20.02 ft Total Well Penetration Depth: 19.77 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 5.937 ft/day y0 = 2.773 ft

10.

1.

Displacement (ft) 0.1 0.01

0. 30. 60.

Time (sec)

W-95 FALLING HEAD Data Set: O:\...\W-95_cks_Falling.aqt Date: 02/14/20 Time: 10:53:03 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-95 AQUIFER DATA Saturated Thickness: 75.15 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-95)

Initial Displacement: 4.4 ft Static Water Column Height: 25.49 ft Total Well Penetration Depth: 25.24 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 59.84 ft/day y0 = 0.4406 ft

10.

1.

Displacement (ft) 0.1 0.01 0.001

0. 30. 60.

Time (sec)

W-95 RISING HEAD Data Set: O:\...\W-95_cks_Rising.aqt Date: 02/14/20 Time: 10:53:23 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-95 AQUIFER DATA Saturated Thickness: 75.15 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-95)

Initial Displacement: 4.4 ft Static Water Column Height: 25.49 ft Total Well Penetration Depth: 25.24 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 26.05 ft/day y0 = 0.1468 ft

10.

1.

Displacement (ft) 0.1 0.01

0. 30. 60.

Time (sec)

W-96 FALLING HEAD Data Set: O:\...\W-96_cks_Falling.aqt Date: 02/14/20 Time: 10:53:44 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-96 AQUIFER DATA Saturated Thickness: 37.73 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-96)

Initial Displacement: 4.4 ft Static Water Column Height: 21.7 ft Total Well Penetration Depth: 21.45 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 41.19 ft/day y0 = 0.666 ft

10.

1.

Displacement (ft) 0.1 0.01 0.001

0. 30. 60.

Time (sec)

W-96 RISING HEAD Data Set: O:\...\W-96_cks_Rising.aqt Date: 02/14/20 Time: 10:54:02 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-96 AQUIFER DATA Saturated Thickness: 37.73 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-96)

Initial Displacement: 4.4 ft Static Water Column Height: 21.7 ft Total Well Penetration Depth: 21.45 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 75.97 ft/day y0 = 1.283 ft

10.

1.

Displacement (ft) 0.1 0.01

0. 15. 30.

Time (sec)

W-97 FALLING HEAD Data Set: O:\...\W-97_cks_Falling.aqt Date: 02/14/20 Time: 10:51:45 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-97 AQUIFER DATA Saturated Thickness: 33.08 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-97)

Initial Displacement: 4.4 ft Static Water Column Height: 14.46 ft Total Well Penetration Depth: 14.21 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 78. ft/day y0 = 1.279 ft

10.

1.

Displacement (ft) 0.1 0.01

0. 30.

Time (sec)

W-97 RISING HEAD Data Set: O:\...\W-97_cks_Rising.aqt Date: 02/14/20 Time: 10:50:56 PROJECT INFORMATION Company: AECOM Client: Westinghouse Location: Hopkins, SC Test Well: W-97 AQUIFER DATA Saturated Thickness: 33.08 ft Anisotropy Ratio (Kz/Kr): 1.

WELL DATA (W-97)

Initial Displacement: 4.4 ft Static Water Column Height: 14.46 ft Total Well Penetration Depth: 14.21 ft Screen Length: 5. ft Casing Radius: 0.083 ft Well Radius: 0.083 ft Gravel Pack Porosity: 0.3 SOLUTION Aquifer Model: Unconfined Solution Method: Bouwer-Rice K = 82.89 ft/day y0 = 1.05 ft

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Appendix D Conceptual Site Model AECOM

Conceptual Site Model Rev. 1a Westinghouse Columbia

Site CSM Block Diagram - Known Spills 2.5X Vertical Exaggeration Flow of Mill Creek Conceptual Site Model Rev. 1a

Site CSM Block Diagram -

Transect Reference North Conceptual Site Model Rev. 1a

Site CSM Block Diagram - Geology 2.5X Vertical Exaggeration Conceptual Site Model Rev. 1a

Site CSM Cross Sections 2.5X Vertical Exaggeration 15X Vertical Exaggeration Wells up to 75' away from the transect are projected onto the cross sections.

Wells that are >20 ft and less than 75 ft are indicated with an asterisk (*).

Legend Potentiometric Surface (2019)

Well Riser Mechanical Area OU Well Screen Surface Water Lithology Clay Silt Sand Black Mingo Conceptual Site Model Rev. 1a Black Mingo Aquifer

Site CSM Cross Sections 2.5X Vertical Exaggeration 15X Vertical Exaggeration Wells up to 75' away from the transect are projected onto the cross sections.

Wells that are >20 ft and less than 75 ft are indicated with an asterisk (*).

Legend Potentiometric Surface (2019)

Well Riser Mechanical Area OU Well Screen Surface Water Lithology Clay Silt Sand Black Mingo Conceptual Site Model Rev. 1a Black Mingo Aquifer

Site CSM Cross Sections 2.5X Vertical Exaggeration 15X Vertical Exaggeration Wells up to 75' away from the transect are projected onto the cross sections.

Wells that are >20 ft and less than 75 ft are indicated with an asterisk (*).

Legend Potentiometric Surface (2019)

Well Riser Mechanical Area OU Well Screen Chemical Area OU Surface Water Lithology Clay Silt Sand Black Mingo Black Mingo Aquifer Conceptual Site Model Rev. 1a

Site CSM Cross Sections 2.5X Vertical Exaggeration 15X Vertical Exaggeration Wells up to 75' away from the transect are projected onto the cross sections.

Wells that are >20 ft and less than 75 ft are indicated with an asterisk (*).

Legend Potentiometric Surface (2019)

Well Riser Chemical Area OU Well Screen Surface Water Lithology Clay Silt Sand Black Mingo Black Mingo Aquifer Conceptual Site Model Rev. 1a

Site CSM Cross Sections 2.5X Vertical Exaggeration 15X Vertical Exaggeration Wells up to 75' away from the transect are projected onto the cross sections.

Wells that are >20 ft and less than 75 ft are indicated with an asterisk (*).

Legend Potentiometric Surface (2019)

Well Riser Surface Water Well Screen Lithology Clay Silt Sand Black Mingo Black Mingo Aquifer Conceptual Site Model Rev. 1a

Site CSM Block - PCE 2.5X Vertical Exaggeration Conceptual Site Model Rev. 1a

Site CSM Block - TCE 2.5X Vertical Exaggeration Conceptual Site Model Rev. 1a

Site CSM Block -Uranium Sources 2.5X Vertical Exaggeration Conceptual Site Model Rev. 1a

Site CSM Block -Tc-99 Sources 2.5X Vertical Exaggeration Note: Most recent groundwater result used from 2018 through and including October 2019 groundwater results. Conceptual Site Model Rev. 1a

Site CSM Block -NO3 Sources 2.5X Vertical Exaggeration Conceptual Site Model Rev. 1a Note: Most recent groundwater result used from 2018 through and including October 2019 groundwater results.

Site CSM Block -Fluoride Sources Flow of Mill Creek 2.5X Vertical Exaggeration Conceptual Site Model Rev. 1a Note: Most recent groundwater result used from 2018 through and including October 2019 groundwater results.

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Appendix E Laboratory Analytical Data (on CD)

AECOM

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility Appendix F Additional Figures AECOM

Legend EL East Lagoon NL North Lagoon SL South Lagoon SAN Sanitary Lagoon WL1 West Lagoon I WL2 West Lagoon II Mill Creek

(

! Black Mingo Clay Elevation (ft-msl)

El ev.Cont ourofTopofBl ackMi ngo( ft-ms l )

Depression Normal q

0 162.5 325 Feet 1:3,898 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 St r uct ur eCont ourMap-Topoft heBl ackMi ngoConf ini ngCl ay WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA PROJECT NO. PREPARED BY: DATE:

60595649 RGM July 2020 FI GUREA Path: C:\Users\mckinneyr\Documents\Westinghouse\mxd\Top of Black Mingo 20200702.mxd

Legend Groundwater Monitoring Wells A Upper Surficial Aquifer A Lower Surficial Aquifer A Black Mingo Aquifer W-89 @

A Upper Floodplain Well W-88 @

A < 5.00

< 5.00 @

A Lower Floodplain Well

? Ditch Culvert Dike Location W-19B

@ < 5.00 A Mill Creek Flow Direction W-36 A < 5.00 Mill Creek W-90 W-91 23.1 @

A <5.00 W-87 Top of Bluff W-43 @

A 4.92 W-40 Inferred Top of Bluff W-60 A < 5.00 < 5.00 10 < 5.00 W-50 W-35 Bottom of Bluff A < 5.00 Plan A WL2 < 5.00 B t W-69 W-61 W-65 W-RW1 uilding W-71 < 5.00 Inferred Bottom of Bluff

< 5.00 7.14 A @@ 3.98 W-45 A 8.11 @

A A

@ A W-70 Secondary Bluff Area W-44 W-39 W-66 A @ A @ W-51 A@ 16.6 W-52 < 5.00 < 5.00

< 5.00 < 5.00 @ 3.56 A

A @ 8.84 A W-72 @

A W-54 Gross Beta Isoconcentration Contours (pCi/L)

W-62 W-53 A W-37

@ < 5.00 4.85 < 5.00 < 5.00 A

@ < 5.00 Gross Beta Inferred Isoconcentration Contours (pCi/L)

A W-73 W-33 @

A W-55 Gross Beta Isoconcentration Contour Less than the W-41R 7.78 < 5.00 @

A W-68 14.3 @

A WL1 W-57 @ 50 A 77.3 Action Level (pCi/L)

@W-RW2 A W-74 < 5.00 A

@ 0 W-56 57.4 Gross Beta Concentration in pCi/L

@ 1

@ < 5.00 11.9 @

A A A @

A < 5.00 W-75 @ A A 54.5

< 5.00 @

A@

A NS Not Sampled SAN @

A W-84 W-86 W-49 @

A W-63 < 5.00 A @

A @

A < 5.00 7.12 EL East Lagoon A NL A@

@A

< 5.00 W-42 @

A W-85 A @

A @ < 5.00 NL North Lagoon A@

@A < 5.00 @

A SL A A

EL @

A W-83 A < 5.00 SL South Lagoon W-48 @A A@ @

A 9.32 @

A SAN Sanitary Lagoon A @

A @

A @ W-82 A

A 100 W-81 4.82 WL1 West Lagoon 1 0

10 50 90 < 5.00 q

W-94 WL2 West Lagoon 2

@A A@ W-23R A < 5.00

< 5.00 @

A A @

A W-14 @A A @ @

A A Note:

Upper Sunset A @

A 35.6 @

W-58 AW-57 A @

A < 5.00 Gator < 5.00 Lake @ @ W-38 W-79 Based upon data collected in Oct 2019 W-59 A SAN A

Pond W-29 17.4 A 5.90 W-46 @ < 5.00 10 50 0 W-27 W-92 @

A 40.4 7.67 W-93 @

A 10 W-95 W-67 @

A @ 8.18 A W-77 NL

< 5.00 5.10 < 5.00 W-76 A

A W-04 65.3 @

A @ 111 A

6.88 10 A A

W-03A @

@A A 19.4

< 5.00 A

W-78 Upper Sunset W-97 W-17 @

A W-28 SL A 11.0 538 W-30 8.26 < 5.00 0 200 400 Dike A 20.8 50 W-18RA

@ EL W-80 A Feet 150 7.29 1:4,800

@A A @

W-10 W-22 W-6 A Map Projection: NAD 1983, South Carolina State Plane, 81.3 @

A 29.6 W-81 FIPS 3900, Feet A 1,370 W-26 < 5.00 Lower Sunset 12.5 W-7A 0 Datum: North American 1983 90 A 114 W-20 Lake W-96 4.36 @

A W-11 W-32 A < 5.00 2,450 50

@A A @ 175 101 Research Drive W-64 Columbia, SC 29203 70.3 T: (803) 254-4400 F: (803) 771-6676 100 A W-15 @

A 50 W-13R 174 @

A Extent of Gross Beta W-47 A W-16 53.2 @

A 61.6 @

A Gator 10.6 in Groundwater W-14 Lower Sunset 35.6 Dike Pond WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY Mill @

A HOPKINS, SOUTH CAROLINA Creek PROJECT NO.

60595649 PREPARED BY:

RGM DATE:

June 2020 FIGURE B Path: M:\EnvDataViz\Westinghouse\mxd\202005_JeremyGrantRequest\fig_B GrossBeta_Oct2019.mxd

Final Interim Remedial Investigation Data Summary Report Westinghouse Columbia Fuel Fabrication Facility AECOM 101 Research Drive Columbia, SC 29203 aecom.com AECOM