ML20353A294

Enclosure 17 - Response to Request for Additional Information - 2018/2019 Annual Groundwater Report

ML20353A294
Person / Time
Site:	Westinghouse
Issue date:	12/18/2020
From:	Westinghouse
To:	Office of Nuclear Material Safety and Safeguards
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References
LTR-RAC-20-94, EPID L-201-RNW-0016
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WESTINGHOUSE NON-PROPRIETARY CLASS 3 7 to LTR-RAC-20-94 Date: December 18, 2020 Enclosure 17 Response to Request for Additional Information 2018/2019 Annual Groundwater report

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility Consent Agreement #19-02-HW 5801 Bluff Road Hopkins, South Carolina 29061 September 2019

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility Quality information Prepared by Prepared by Reviewed by Mike Glowacz, P.G. Chuck Suddeth, P.G. Jeremy Grant, P.G.

Sr. Geologist Sr. Project Manager Sr. Project Manager Prepared by:

AECOM 101 Research Drive Columbia, SC 29203 aecom.com AECOM i

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility Table of Contents

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

2. Background ............................................................................................................................................................. 2 2.1 Site Location and Physical Setting ............................................................................................................... 2 2.2 Site Operational Background ....................................................................................................................... 2 2.3 Facility Operational Units (OUs) ................................................................................................................... 2 2.4 Geology/Hydrogeology ................................................................................................................................. 2

3. Groundwater Monitoring ......................................................................................................................................... 4

4. Results .................................................................................................................................................................... 5 4.1 Groundwater Flow ........................................................................................................................................ 5 4.1.1 Upper Surficial Aquifer ................................................................................................................... 5 4.1.2 Lower Surficial Aquifer ................................................................................................................... 5 4.1.3 Black Mingo Aquifer ....................................................................................................................... 5 4.2 Groundwater Quality .................................................................................................................................... 5 4.2.1 Chlorinated Volatile Organic Compounds (CVOC)......................................................................... 5 4.2.1.1 PCE ................................................................................................................................. 6 4.2.1.2 TCE ................................................................................................................................. 6 4.2.1.3 cis-1,2-Dichloroethene ..................................................................................................... 7 4.2.2 SVOCs ........................................................................................................................................... 7 4.2.3 Nitrate ............................................................................................................................................ 7 4.2.4 Fluoride .......................................................................................................................................... 7 4.2.5 Uranium ......................................................................................................................................... 7 4.2.6 Tc-99 .............................................................................................................................................. 8

5. Conclusions and Recommendations ..................................................................................................................... 10 5.1 Conclusions ................................................................................................................................................ 10 5.2 Recommendations ..................................................................................................................................... 11

6. References............................................................................................................................................................ 12 AECOM ii

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility Tables Table 1 Monitoring Well Construction Details Table 2 Groundwater Levels and Elevations Table 3 Summary of Groundwater Field Parameter Data Table 4 Summary of Groundwater Analytical Results Figures Figure 1 Site Location Map Figure 2 Property Map Figure 3 Site Map Figure 4 Operational Units Map Figure 5 Upper Surficial Aquifer Potentiometric Map November 2018 Figure 6 Lower Surficial Aquifer Potentiometric Map November 2018 Figure 7 Black Mingo Aquifer Potentiometric Map November 2018 Figure 8 Upper Surficial Aquifer Potentiometric Map January 2019 Figure 9 Lower Surficial Aquifer Potentiometric Map January 2019 Figure 10 Black Mingo Aquifer Potentiometric Map January 2019 Figure 11 Extent of PCE in Upper Surficial Aquifer November 2018 Figure 12 Extent of PCE in Upper Surficial Aquifer January 2019 Figure 13 Extent of PCE in Lower Surficial Aquifer November 2018 Figure 14 Extent of PCE in Lower Surficial Aquifer January 2019 Figure 15 Extent of TCE in Upper Surficial Aquifer November 2018 Figure 16 Extent of TCE in Upper Surficial Aquifer January 2019 Figure 17 Extent of TCE in Lower Surficial Aquifer November 2018 Figure 18 Extent of TCE in Lower Surficial Aquifer January 2019 Figure 19 Extent of Nitrate in Groundwater November 2018 Figure 20 Extent of Nitrate in Groundwater January 2019 Figure 21 Extent of Fluoride in Groundwater November 2018 Figure 22 Extent of Fluoride in Groundwater January 2019 Figure 23 Extent of Uranium in Groundwater November 2018 Figure 24 Extent of Uranium in Groundwater January 2019 Figure 25 Extent of Technetium 99 in Groundwater November 2018 Figure 26 Extent of Technetium 99 in Groundwater January 2019 Appendices Appendix A Groundwater Field Sampling Records Appendix B Historical Groundwater Monitoring Data Appendix C Laboratory Analytical Reports Appendix D Trend Plots Appendix E DHEC Correspondence AECOM iii

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility List of Acronyms AECOM AECOM Technical Services, Inc.

AOC Area of Concern bgs below ground surface CA Consent Agreement CERCLA Comprehensive Environmental Response, Compensation, and Liability Act CFFF Columbia Fuel Fabrication Facility Cis-1,2 DCE cis-1,2-dichloroethene COPC constituent of potential concern CSM Conceptual Site Model CVOC chlorinated volatile organic compound DHEC South Carolina Department of Health and Environmental Control DOE United States Department of Energy EPA United States Environmental Protection Agency GEL Labs GEL Laboratories, LLC MCL maximum contaminant level MSL mean sea level NPDES National Pollution Discharge Elimination System NPL National Priority List NRC Nuclear Regulatory Commission OU Operational Unit PCE tetrachloroethene pCi/L picocuries per liter Rust Rust Environment and Infrastructure S&ME Soil and Material Engineers SC South Carolina SCRDI South Carolina Recycling and Disposal, Inc.

Shealy Shealy Environmental Services, Inc.

SVOC semivolatile organic compound TCL Target Compound List TAL Target Analyte List Tc-99 Technetium-99 TCE trichloroethene ug/L micrograms per liter VOC volatile organic compound Westinghouse Westinghouse Electric Company, LLC WL2 West Lagoon 2 WWTP wastewater treatment plant AECOM iv

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility

1. Introduction AECOM Technical Services (AECOM) has prepared this 2018/2019 Annual Groundwater Monitoring Report for the Westinghouse Columbia Fuel Fabrication Facility (CFFF). The site is located at 5801 Bluff Road in Hopkins, South Carolina (Figure 1). CFFF manufactures and assembles fuel assemblies and components for the commercial nuclear power industry.

As a result of historical operations and the need to further assess potential environmental impacts, South Carolina Department of Health and Environmental Control (DHEC) and CFFF entered into Consent Agreement (CA) 19 HW on February 26, 2019. The CA requires further assessment and potential remediation of constituents of potential concern (COPC) as outlined in the United States Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA; also known as Superfund) and the South Carolina Hazardous Waste Management Act.

Condition 1 of the CA specifies that CFFF prepare a Remedial Investigation (RI) Work Plan that presents a comprehensive approach for the evaluation of property groundwater, surface water, sediment, and soil quality; sufficient to assess the full nature and extent of COPC. The CA also specifies that the RI Work Plan include a Conceptual Site Model (CSM) reflecting CFFFs current understanding of site hydrogeology, known COPC sources, potential migration pathways, along with a summary of potential risks to human health and the environment. The RI Work Plan was approved by DHEC in June 2019.

The scope of work outlined in the RI Work Plan is currently ongoing. As data from this work is collected, the CSM is updated with geologic and multi-media (i.e. sediment, surface water, groundwater) COPC data. After each phase of work, the data will be evaluated using the CSM to assess where additional data is needed to fully understand the extent of COPC impact from historical operations.

Groundwater sampling was completed during the Fall of 2018 and January of 2019 to meet the ongoing monitoring requirements of the National Pollution Discharge Elimination System (NPDES) Permit SC0001848 and CA between DHEC and CFFF and in accordance with the Remedial Investigation Work Plan (AECOM, 2019a). Details regarding the groundwater sample collection and QA\QC procedures are contained within the AECOM RI Work Plan dated June 2019.

This report provides an overview of the Site (Section 2.0), describes the sampling activities (Section 3.0), and presents the results (Section 4.0). Conclusions and recommendations based on the results are discussed in Section 5.0. Cited references are provided in Section 6.0. This report has been prepared by a technical team consisting of personnel from Westinghouse and AECOM.

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2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility

2. Background 2.1 Site Location and Physical Setting The CFFF property is located on Bluff Road (SC Highway 48) approximately 15 miles southeast of Columbia, SC and includes approximately 1,200 acres. The property is surrounded by rural forested and agricultural property. Figures 1 through 3 illustrate the site features discussed below.

The primary plant building is located approximately 2,700 feet southwest of Bluff Road on the northern portion of the property. The wastewater treatment plant (WWTP) is located near the southwest corner of the plant building. Treated wastewater is piped to the Congaree River where it is discharged under NPDES permit SC0001848 from a diffuser located along the bottom of the river at a location approximately three miles south of the developed portion of the property.

The SCRDI Bluff Road (formerly known as South Carolina Recycling and Disposal, Inc.) site is located across Bluff Road from the northern property boundary. According to information on the internet (Justia US Law - law.justia.com),

hazardous waste storage began on this property in late-1973 or early-1974 and operations ceased in 1982. This property was placed on the United States Environmental Protection Agencys (EPA) Superfund programs National Priority List (NPL) in 1983. Releases at SCRDI are not known to have impacted CFFF at this time.

Based on topographic data depicted on Figure 1 and on-site survey data, the elevation of the developed area of the property is approximately 130-140 feet above mean sea level (MSL). Elevations drop to approximately 110 feet above MSL immediately south of the plant/WWTP area, on the Congaree River floodplain and Mill Creek, a tributary of the Congaree River. The change in elevation occurs abruptly along a bluff that defines the southern edge of the developed portion of the property.

A manmade pond (Gator Pond) that pre-exists CFFF is located approximately 500 feet southwest of the WWTP within a step-down area of the bluff. The pond is fed by a spring and does not have a constructed spillway. Water discharges from the pond through groundwater seepage or overland flow during periods of high precipitation.

Upper and Lower Sunset Lakes are located west and south of the pond and approximately 900 feet southwest of the WWTP. Sunset Lakes are located within a natural oxbow of Mill Creek. A manmade dam approximately 1,700 feet south of the WWTP backs up water in Mill Creek, creating Lower Sunset Lake. A second manmade dam cuts across Mill Creek approximately 1,000 feet southwest of the WWTP, creating Upper Sunset Lake.

The southern portion of the property, including the Gator Pond, Mill Creek, and Sunset Lakes are located within the floodplain of Mill Creek and the Congaree River. Surface drainage at the site flows toward several drainage ditches across the property and surrounding areas. These ditches flow into a stream that flows into upstream areas of Mill Creek/Upper Sunset Lake approximately 3,000 feet west of the plant.

2.2 Site Operational Background The CFFF was constructed in 1969. Prior to construction the property consisted of farmland and woodlands. The main manufacturing activity is the fabrication of low-enriched uranium fuel assemblies and components for the nuclear power industry. The manufacturing process generates multiple wastewater streams which are treated by various physical/chemical/biological processes and in WWTP lagoons prior to discharge to the Congaree River under a NPDES permit issued by DHEC.

Releases of COPC have occurred from the wastewater treatment system, manufacturing operations, and past activities performed since 1969. CFFF has assessed known releases and installed an extensive groundwater monitoring system over multiple decades beginning in the early 1980s. Assessment activities have determined that releases have impacted soil and groundwater in locations largely confined to the immediate plant area. Various remediation efforts have been undertaken in response to the identified releases.

2.3 Facility Operational Units (OUs)

Based upon current and historical operations, the facility has been divided into eight operational units (OUs) illustrated on Figure 4. The OUs are identified as the Northern Storage Area, Mechanical Area of the plant building, AECOM 2

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility Chemical Area of the plant building, West Lagoons Area, Wastewater Treatment Area, Sanitary Lagoon Area, Southern Storage Area, Western Storage Area and Southern Storage Area. One area of concern (AOC), entitled the Western Groundwater AOC, has also been identified. These OUs and AOC are described in detail in the Remedial Investigation Work Plan dated April 2019 (AECOM, 2019a).

2.4 Geology/Hydrogeology The CFFF is located within the Upper Coastal Plain physiographic province. For the purpose of site characterization, the CFFF Site hydrogeology has been subdivided into four hydrogeologic units: surficial aquifer, floodplain sediment aquifer, Black Mingo aquifer, and Middendorf aquifer. The site geology/hydrogeology were described in the Remedial Investigation Work Plan (AECOM, 2019a) and are summarized below.

Surficial aquifer sediment generally occur to a depth of 20 to 40 feet below ground surface (bgs) at the plant site, depending on topography, and can be differentiated into upper surficial aquifer sediments and lower surficial aquifer sediments. The upper surficial aquifer sediments consist of firm clayey, silty sands (10 to 20 feet thick). The Lower Surficial Aquifer consists of loose sands and silty sands (also 10 to 20 feet thick). Floodplain sediment generally occurs to a depth of 25 to 45 feet bgs with one anomalous boring location containing over 80 feet of sediment. These sediments consist of silt to clayey silt (8-11 feet thick) at the surface underlain by alternating sand and silt/clay layers.

The surficial aquifer and Congaree River floodplain sediment is underlain by a confining bed composed of dry silt/clay and brittle shale of the upper Black Mingo Formation. Beneath the clay confining unit is an artesian sand aquifer within the lower Black Mingo Formation known as the Black Mingo aquifer. Previous geologic cross sections (AECOM, 2013) indicate that the Black Mingo confining bed ranges in thickness from 39 to 83 feet.

The Middendorf Formation occurs below the Black Mingo Formation. Sediments of the Middendorf Formation generally consist of multi-colored clay interbedded with fine to coarse grained sand. Previous subsurface investigations have not extended into the Middendorf aquifer.

Groundwater in the surficial aquifer occurs under unconfined (water table) conditions and generally flows from areas of higher topography in the vicinity of the plant building towards areas of lower topography in the floodplain of the Congaree River and its local tributary, Mill Creek. There is a dynamic relationship between surface water in the ditches that transect the site and groundwater in the surficial aquifer. The northern portions of the ditches are often above the water table and thus the ditches at these locations are sometimes dry. Runoff from precipitation that enters the dry portions of the ditches may infiltrate to the water table, temporarily recharging the surficial aquifer. The bottom of the southern portions of the ditches is below the water table and continually receives discharge of groundwater from the surficial aquifer. Middle portions of the ditches may recharge the shallow aquifer during low water table conditions and may receive groundwater discharge during high water table conditions.

Groundwater flow in the Black Mingo aquifer is inferred to the southwest based upon groundwater elevations from the three monitoring wells that are screened within this aquifer.

Based upon previous hydraulic characterization by AECOM and Rust Environment and Infrastructure (Rust), the average linear flow velocity in the surficial aquifer was estimated to be 0.42 feet per day or 153 feet per year. The potential for flow between the surficial aquifer and the Black Mingo aquifer was previously assessed to be downward at vertical hydraulic gradients ranging between 0.04 and 0.1 feet per feet (Rust, 1995 and AECOM, 2013). However, low moisture content and low vertical hydraulic conductivities of less than 10-7 centimeters per second (S&ME, 1982) throughout the 39 to 83 foot thickness of the Black Mingo confining clay preclude significant transfer of fluid between the surficial aquifer and the Black Mingo aquifer.

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2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility

3. Groundwater Monitoring The current existing monitoring well network consists of 60 monitoring wells. The monitoring well construction details are summarized on Table 1. Fall 2018 semi-annual sampling activities were completed by AECOM and CFFF personnel during October-December 2018. Winter 2019 semi-annual sampling activities were completed by AECOM and CFFF personnel during January 2019. Approval was granted by the Department to postpone the June-August 2019 sampling event to October 2019 to coincide with the CA well sampling event which will include all 90 wells (Appendix E). Non-routine groundwater monitoring was conducted several times during 2018-2019. These non-routine groundwater sampling events are described in further detail in Section 4.3. Monitoring activities were conducted in accordance with the requirements of the sites NPDES permit and by the procedures described in the Remedial Investigation Work Plan (AECOM, 2019a).

The depth to water in the monitoring wells was measured using electronic water level meters on November 26, 2018 and January 17, 2019. The water levels were converted to elevations and used to create potentiometric maps of the aquifer zones discussed in Section 4.1 below.

Monitoring wells were purged by low flow methodology using a peristaltic pump and water levels were monitored during purging. Groundwater quality indicator parameters of pH, specific conductance, dissolved oxygen, oxidation-reduction potential (ORP), turbidity, and temperature were monitored during the groundwater purging process and recorded on the Field Data Logs for Groundwater Sampling, which are included in Appendix A. Samples were collected once the parameters had stabilized in accordance with the low-flow sampling procedure in the Remedial Investigation Work Plan (AECOM, 2019a).

Upon collection, all groundwater samples were labeled, preserved on ice, and kept under chain-of-custody protocol until received at the analytical laboratory. The groundwater samples were analyzed by DHEC certified laboratories Shealy Environmental Services, Inc. (Shealy), GEL Laboratories, LLC (GEL Labs), and the Westinghouse Chemical Laboratory as appropriate for the following analyses:

Target compound list (TCL) VOCs by EPA Method 8260B; TCL semi-VOCs by EPA Method 8270D; Target analyte list (TAL) metals by EPA Method 6010D/6020B; Nitrate by EPA Method 353.2; Ammonia by EPA Method 350.1; Fluoride by EPA Method 9056A; Isotopic Uranium by United States Department of Energy (DOE) Environmental Measurements Laboratory Health and Safety Laboratory (EML HASL)-300 (U-02-RC Modified);

Isotopic Uranium by EPA Method 200.8/200.2; and Technetium-99 (Tc-99) via DOE EML HASL-300 (Tc-02-RC Modified).

Laboratory analytical reports and chain-of-custody forms are included in Appendix B.

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2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility

4. Results 4.1 Groundwater Flow The water level measurements on November 26, 2018 and January 17, 2019 were converted to water level elevations using existing monitoring well top-of-casing elevation data and are summarized in Table 2. The water level elevations were used to prepare the potentiometric maps for the upper surficial aquifer, lower surficial aquifer, and Black Mingo aquifer for the Fall 2018 and January 2019 monitoring periods (Figures 5 through 10).

4.1.1 Upper Surficial Aquifer Based on the upper surficial aquifer potentiometric maps for November 26, 2018 and January 17, 2019 (Figures 5 and 8, respectively), groundwater in the upper surficial aquifer can be inferred to flow radially from the facility toward the southwest, south, and southeast. These upper surficial aquifer potentiometric contours and flow directions are similar to previous results.

4.1.2 Lower Surficial Aquifer Based on the lower surficial aquifer potentiometric maps for November 26, 2018 and January 17, 2019 (Figures 6 and 9, respectively), groundwater flow in the lower surficial aquifer trends to the southwest with components of flow to the west. These lower surficial aquifer potentiometric contours and flow directions are similar to previous results.

4.1.3 Black Mingo Aquifer Based on the Black Mingo Aquifer potentiometric maps for November 26, 2018 and January 17, 2019 (Figures 7 and 10, respectively), groundwater in the Black Mingo aquifer can be inferred to flow toward the southwest in western areas of the site. The Black Mingo aquifer potentiometric contours and flow directions are similar to previous results.

4.2 Groundwater Quality Groundwater quality indicator parameters measured in the field during the well purging and sampling are presented in Table 3. The groundwater sampling logs are included in Appendix A. Laboratory analytical reports are included in Appendix B and the analytical results for the monitoring wells are summarized in Table 4. Historic analytical data is included in Appendix C.

Historic data trends for nitrate, fluoride, gross alpha and gross beta have been included in previous annual reports and updated trend plots are presented in Appendix D. CVOCs, uranium and Tc-99 plots will be included in future reports after concentration data is collected during four monitoring events to allow for trend analysis..

CFFF is transitioning from monitoring groundwater for gross alpha and gross beta to monitoring for isotopic uranium and Tc-99. Gross alpha and gross beta are typically used as screening parameters since they can represent various radionuclide components. In the past, action levels were established for gross alpha and gross beta whereby additional contingent tests were initiated for isotopic uranium and Tc-99 if the action levels were exceeded. Results below the action levels would not have been further speciated, thus calling to question whether the low detection of gross alpha or gross beta was a result of site activities or other circumstances such as natural radionuclide presence.

CFFF has requested that DHEC and NRC allow them to eliminate the screening and contingent tests. Resultantly, the analysis will be accurate representations of the sites environmental impact, irrespective of other elements.

Based on previous groundwater assessment activities, the 2014 Preliminary Baseline Risk Assessment (AECOM, 2014), and the 2019 Preliminary Human Health Risk Assessment (AECOM, 2019a), COPCs in groundwater are tetrachloroethene (PCE), trichloroethene (TCE), cis-1,2-dichloroethene (cis-1,2-DCE), nitrate, fluoride, gross alpha, gross beta, uranium, and technetium-99 (Tc-99).

4.2.1 Chlorinated Volatile Organic Compounds (CVOCs)

Three CVOCs (PCE, TCE, and cis-1,2-DCE) were detected in the upper surficial aquifer and the lower surficial aquifer. TCE and cis-1,2-DCE are daughter products of the dechlorination of PCE. CVOCs were not detected in the AECOM 5

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility groundwater samples collected from the Black Mingo aquifer monitoring wells. There is currently no evidence that there are ongoing releases of CVOCs.

4.2.1.1 PCE PCE was detected in groundwater from 29 of the 60 monitoring wells (Table 4) with PCE exceeding the maximum contaminant level (MCL) of 5.0 micrograms per liter (ug/L) in groundwater samples from 15 monitoring wells.

Upper Surficial Aquifer Figures 11 and 12 illustrate the PCE concentrations in the upper surficial aquifer during the Fall 2018 and January 2019 sampling periods, respectively. Two PCE plumes are present in the upper surficial aquifer, one in west and one south of the facility. The highest PCE concentrations in upper surficial wells were from wells W-39 and W-41R in the western PCE plume at concentrations ranging from 190 ug/L to 310 ug/L. Monitoring well W-39 is screened across both the upper and lower portion of the surficial aquifer. Therefore, data from well W-39 is included in the upper and lower surficial aquifer analysis. The PCE concentrations were approximately an order of magnitude greater in the western PCE plume than the southern PCE plume.

The western PCE plume in the upper surficial aquifer appears to emanate from an area between WL2 and the plant building. Groundwater in this area migrates to the southwest. The southern PCE plume in the upper surficial aquifer emanates from the southern developed areas of the site and extends to the south.

Lower Surficial Aquifer Figures 13 and 14 illustrate the PCE concentrations in the lower surficial aquifer during the Fall 2018 and January 2019 sampling periods, respectively. In the lower surficial aquifer, a PCE plume was observed directly west of the facility in the same area as the PCE plume observed in the upper surficial aquifer, however with a greater aerial extent. The highest PCE concentrations in lower surficial wells were from wells W-33, W-39 W-48, W-68, and RW-2 in the western PCE plume at concentrations ranging from 130 ug/L to 300 ug/L. Monitoring well W-39 is screened across both the upper and lower portion of the surficial aquifer. Therefore, data from well W-39 is included in the upper and lower surficial aquifer analysis. The PCE plume in the lower surficial aquifer appears to emanate from an area between WL2 and the plant building and migrates to the southwest.

4.2.1.2 TCE TCE was detected in groundwater from 18 of the 60 monitoring wells (Table 4) with TCE detected above its MCL of 5.0 ug/L in groundwater samples from 8 monitoring wells. The greatest TCE concentration was observed in the groundwater from W-65 at a concentration of 94 ug/L during the January 2019 sampling event. W-65 is screened in the lower surficial aquifer.

Upper Surficial Aquifer The upper surficial TCE plumes in the western and southern plumes are in the same locations as the PCE plumes but with a smaller aerial extent. Figures 15 and 16 illustrate the TCE concentrations in the upper surficial aquifer during the Fall 2018 and January 2019 sampling periods, respectively. The TCE MCL was exceeded in the western TCE plume, southern TCE plume, and one location near the southwest corner of the plant building (W-38) in the upper surficial aquifer during each monitoring period. TCE exceeded the MCL in groundwater samples from monitoring well W-41R in the western TCE plume, W-14 and W-67 in the southern TCE plume, and monitoring well W-38 near the southwest corner of the plant building.

Lower Surficial Aquifer In the lower surficial aquifer, a TCE plume was observed directly west of the facility extending in a southwestern direction. The TCE plume in the lower surficial aquifer is in the same location as the PCE plume but with a smaller aerial extent. Figures 17 and 18 illustrate the TCE concentrations in the lower surficial aquifer during the Fall 2018 and January 2019 sampling periods, respectively. The TCE MCL was exceeded in the western TCE plume in groundwater from lower surficial aquifer wells W-33, W-65, and RW-2R in the Fall 2018 and W-33, W-48, W-65, and RW-2R in January 2019 at concentrations ranging from 5.1 ug/L to 94 ug/L. The greatest TCE concentration was observed in the groundwater from W-65 at a concentration of 94 ug/L during the January 2019 sampling event.

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2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility 4.2.1.3 cis-1,2-Dichloroethene Cis-1,2-DCE was detected at concentrations ranging from 1.1 ug/L to 46 ug/L in groundwater from 10 monitoring wells. Concentrations of cis-1,2 DCE did not exceed the MCL of 70 ug/L in groundwater from the 60 monitoring wells.

4.2.2 SVOCs Concentrations of SVOCs were not detected in excess of their MDLs.

4.2.3 Nitrate Nitrate was detected in groundwater from the upper and lower surficial aquifer wells and one of the two floodplain wells (Table 4) with nitrate detected above the MCL of 10 milligrams per liter (mg/L) in groundwater from 21 monitoring wells. Figures 19 and 20 illustrate the nitrate concentrations for the Fall 2018 and January 2019 sampling periods, respectively. The highest nitrate concentration was observed in the groundwater collected from upper surficial monitoring well W18R at a concentration of 750 mg/L during the January 2019 sampling event. The aerial extent of the nitrate plume is primarily in the area of the facility WWTP and extends to areas to the west, southwest, and south. Nitrate was not detected in any of the Black Mingo aquifer monitoring wells.

Based on a review of time-series plots from 2013-2019, the site nitrate plume is stable. Figure D1 in Appendix D illustrates nitrate concentration trends for groundwater from twelve monitoring wells. Groundwater from these monitoring wells were selected for trend analysis by including wells that are within the plume and along the edges of the plume. Since 2013, nitrate concentrations have decreased in groundwater from monitoring wells, W-10, W-29, and W-38. Nitrate concentrations in groundwater from monitoring well W-47 has indicated a slow increasing trend since 2014. Monitoring well W-47 is downgradient of the portion of the site with the highest nitrate concentrations (greater than 100 mg/L on Figures 19 and 20) in groundwater. Groundwater trends from the remaining monitoring wells indicate that nitrate concentrations remained stable and within historic ranges over the last six years.

4.2.4 Fluoride Fluoride was detected in groundwater from all 61 monitoring wells (Table 4) with fluoride detected above the MCL of 4 mg/L in groundwater from 12 monitoring wells. Fluoride is a naturally occurring element and many of the concentrations in groundwater were orders of magnitude below the MCL indicating that the detections are not likely due to facility operations. Figures 21 and 22 illustrate the fluoride concentrations for the Fall 2018 and January 2019 sampling events, respectively. The greatest fluoride concentration was observed in the groundwater from upper surficial well W-29 at a concentration of 9.69 mg/L during the January 2019 sampling period. The fluoride plume exceeding the MCL in the surficial aquifer is primarily in the southern area of the WWTP and extends to the south toward the Gator Pond and Lower Sunset Lake.

Based on a review of time-series plots from 2013-2019, the site fluoride plume is stable. Figure D2 in Appendix D illustrates fluoride concentration trends for groundwater from eight monitoring wells. Groundwater from these monitoring wells were selected for trend analysis by including wells that were within the plume and along the edges of the plume. Fluoride concentrations in W-30 decreased significantly from 2013 until July 2017 with a slight increasing trend since July 2017. Fluoride concentrations from monitoring W-29 increased from April 2017 to April 2018 but groundwater from this well has indicated a decreasing trend since the high in April 2018. Fluoride concentrations in groundwater from monitoring wells W-18 and W-47 have indicated an overall decreasing trend. These two monitoring wells are downgradient of monitoring well W-29. Groundwater trends from the remaining monitoring wells indicate that fluoride concentrations remained stable and within historic concentration ranges.

4.2.5 Uranium Uranium was detected in groundwater from 35 of the 61 monitoring wells (Table 4) with total uranium detected above its MCL of 30 ug/L in the groundwater samples collected from monitoring wells W-55, W-56, and W-59. The exceedance of the groundwater MCL for uranium is localized to an area adjacent to the plant building. Additional assessment is ongoing to define the localized extent of the uranium MCL exceedance. Of the 35 monitoring wells with detections of uranium in groundwater, 27 are several orders of magnitude below the MCL. Figures 23 and 24 illustrate the total uranium concentrations detected during the Fall 2018 and the January 2019 sampling periods, respectively. The highest total uranium concentration of 187 ug/L was detected in groundwater from monitoring well W-55 during the Fall 2018 sampling event.

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2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility As previously mentioned, uranium concentration trends will be evaluated when enough data exists to support trend analysis and will replace the trend analysis for gross alpha. Gross alpha detections may include other naturally occurring alpha emitters or may be associated with uranium from facility operations.

Based on a review of gross alpha concentration trends for groundwater in time-series plots from 2013-2019 from eight monitoring wells, the site gross alpha fluctuates over time. Groundwater from these monitoring wells were selected for trend analysis by including wells that are within the area of highest gross alpha concentrations and along the edges of the highest gross alpha detections. Monitoring wells W-55, W-56 and W-59 were installed in September 2018, therefore trend analysis cannot currently be evaluated for gross alpha/uranium concentrations in groundwater from these monitoring wells.

The gross alpha trend plot is included as Figure D3 in Appendix D. Gross alpha concentrations in well W-30 historically exhibited the highest gross alpha concentrations with a maximum gross alpha concentration of 60 pCi/L being measured in groundwater from this well in July 2018. From 2014-2015, groundwater from this well had an overall decreasing trend, from December 2015 through July 2018 an overall increasing trend and an overall decreasing trend from July 2018 to October 2018. Gross alpha concentration in monitoring well W-30 increased in January 2019 when compared to the October 2018 concentration but remains within historic gross alpha concentration ranges. Gross alpha concentrations in groundwater from the remaining monitoring wells also fluctuated since 2013 but remains within historic ranges.

4.2.6 Tc-99 Tc-99 was detected in groundwater from 13 of the 61 monitoring wells (Table 4) with Tc-99 detected above its MCL of 900 picocuries per liter (pCi/L) in the groundwater samples collected from two lower surficial aquifer monitoring wells (W-6 and W-11). Figures 25 and 26 illustrate the Tc-99 concentrations detected during the Fall 2018 and the January 2019 sampling periods, respectively. The highest Tc-99 concentration was detected in groundwater from monitoring well W-11 at a concentration of 4,200 pCi/L in January 2019. Additional assessment is ongoing to define the extent of the Tc-99 MCL exceedance in groundwater.

Tc-99 concentration trends will be evaluated when enough data exists to support trend analysis and will replace trend analysis for gross beta. Tc-99 is the only known beta emitter at CFFF. Based on a review of gross beta concentration trends for groundwater in time-series plots from 2013-2019 for groundwater from ten monitoring wells, the site gross beta concentrations are relatively stable over time with minor fluctuations. Groundwater from these monitoring wells were selected for trend analysis by including wells that are within the area of highest gross beta concentrations and along the edges of the highest gross beta detections. Groundwater from monitoring wells W-6 and W-11 was not previously monitored on a schedule. Therefore, recent data regarding gross beta concentration trends does not exist for these monitoring wells.

The gross beta trend plot is included as Figure D4 in Appendix D. Gross beta concentrations in groundwater from these monitoring wells have fluctuated over time, but have generally decreased or remained stable since April 2017.

Groundwater from monitoring well W-17 historically exhibited the highest gross beta concentrations with a maximum gross beta concentration of 592 pCi/L being measured in groundwater from this well in January 2016. Because this monitoring well was not required to be sampled as part of the sites NPDES permit requirements, monitoring of groundwater from this well ceased after April 2016 but resumed in the Fall of 2018. The gross beta concentrations in groundwater from monitoring well W-17 in October 2018 and January 2019 are less than historical concentrations from October 2013 through April 2016.

4.3 Non-routine Groundwater Sampling During 2018-2019, non-routine groundwater sampling was conducted at CFFF to coincide with additional investigative activities at the site. Groundwater analytical results from non-routine groundwater sampling events are displayed in Table 4.

Monitoring Well W-28 In July of 2018, the site had a leak from HF Spiking Station 2 and subsequently conducted an extensive environmental sampling campaign of the soil underneath the impacted area and excavated 154.13 tons of soil and concrete. To monitor the potential migration of any chemicals in the subsurface prior to completion of the remediation AECOM 8

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility activities, the site has sampled groundwater from the nearest downgradient monitoring well W-28 on a quarterly basis.

Recovery Well RW-1 RW-1 was an existing well at CFFF that was out of service. It was evaluated and determined to be a properly functioning well. It has been added back to the sites monitoring network, redeveloped and subsequently had a groundwater sample collected in April 2019.

Southern Storage Area (SSA) Operable Unit (OU)

On June 18, 2019, Westinghouse submitted a work plan to DHEC to investigate the SSAOU. The SSAOU investigation was submitted as Addendum 1 of the overall Remedial Investigation being performed under the Consent Agreement CA-19-02-HW. The SSAOU, in part, is used for the intermodal storage of materials awaiting uranium (U) recovery. On May 30, 2019, a scheduled inspection of intermodal containers (sea-lands) within the SSAOU was completed and identified impaired roofing and degraded drums due to rainwater intrusion in one sea-land, C-40. The groundwater wells associated with the SSAOU (W-7A, W-10, W-11, W-13R, W-15, W-16, and W-32) were sampled on June 4-5, 2019. The results were received on June 21, 2019, and submitted to the Department on August 1, 2019, in the July 2019 CA Progress Report. These results indicated that the intermodal storage has not contributed to the state of the groundwater beneath the site.

AECOM 9

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility

5. Conclusions and Recommendations 5.1 Conclusions The following conclusions are based upon review of the groundwater monitoring data collected during the Fall 2018 and January 2019 sampling periods:

Groundwater in the upper surficial aquifer flows radially toward the southwest, south, and southeast.

Groundwater flow in the lower surficial aquifer is similar but with a more western component of flow west of the facility area. Groundwater flow in the Black Mingo aquifer is toward the west-southwest. The shape of the potentiometric surfaces and groundwater flow patterns in the surficial and Black Mingo aquifers are similar during the Fall 2018 and January 2019.

CVOCs detected during the Fall 2018 and January 2019 monitoring periods exceeding MCLs were primarily PCE and, to a lesser extent, TCE. One additional daughter product of PCE reductive dechlorination, cis-1,2 DCE, was detected in groundwater at the WCFFF site at concentrations below the MCL. Trans-1,2-Dichloroethene and vinyl chloride were not detected in groundwater from the monitoring wells.

The groundwater analytical results indicate that there are PCE and TCE groundwater plumes in the upper and lower portions of the surficial aquifer west of the plant building and in the upper surficial aquifer south of the plant building.

The plumes in the western CVOC plume appears to emanate from the vicinity of WL2 and from a source(s) between the plant building and WL2. Elevated PCE concentrations in the western CVOC plume extend from the upper surficial aquifer to the lower surficial aquifer. Concentrations of TCE above its MCL occur primarily in the lower surficial aquifer. It is currently not known whether the PCE concentrations in exceedance of its MCL in the groundwater samples from monitoring well W-19B is a result of the plume emanating from the WL2/plant areas or another source.

The southern CVOC plume is located in the southern portion of the developed area of the facility and upgradient of the man-made pond. Elevated PCE concentrations within this plume appear to be within the upper surficial aquifer only, based on previous conclusions (AECOM, 2017). PCE concentrations in this plume are an order of magnitude lower than the PCE concentrations in the western plume and do not appear to be related to a specific potential source area of the WCFFF site. There are no known processes in this area that currently use PCE or used PCE in the past.

Nitrate concentrations during the Fall 2018 and January 2019 periods exceeding MCLs were in areas west, southwest, and south of the WWTP. The highest nitrate concentrations were observed in the groundwater samples collected from upper surficial monitoring wells south of the SL area of the WWTP.

Fluoride concentrations during the Fall 2018 and January 2019 periods exceeding MCLs were in areas west, southwest, and south of the WWTP. The highest fluoride concentrations were observed in the groundwater samples collected from upper surficial monitoring wells in the area of the southern portion of the WWTP. The aerial extent of the fluoride plume is primarily in the area of the facility WWTP and extending to areas to the west, southwest, and south.

Uranium concentrations exceeded the MCL during the Fall of 2018 and January 2019 in three upper surficial monitoring wells located near the southwest side of the facility building. The exceedance of uranium MCL in groundwater is localized near the plant building and further assessment of groundwater in this area is ongoing.

Tc-99 concentrations exceeded the MCL during the Fall of 2018 and January 2019 in two lower surficial monitoring wells. Additional assessment is ongoing to assess the source of Tc-99 in groundwater.

Based upon historical and current groundwater analytical results, no off-site impacts of COPCs are known or believed to have occurred.

COPCs were not detected in Black Mingo aquifer monitoring wells.

AECOM 10

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility 5.2 Recommendations Westinghouse will continue to perform comprehensive evaluations of groundwater and other environmental media to determine the full nature and extent of impacts from historic operations at the CFFF. Westinghouse has also instituted new programmatic controls to prevent impacts from current operations.

Based upon the above conclusions, continued semiannual monitoring in accordance with the NPDES Permit is recommended. The next groundwater sampling periods are scheduled for the Fall 2019 and Spring 2020.

AECOM 11

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility

6. References AECOM, 2013. Remedial Investigation Report, Westinghouse Electric Company, Columbia Fuel Fabrication Facility, Richland County, South Carolina, December 31.

AECOM, 2014. Preliminary Baseline Risk Assessment, Westinghouse Columbia Fuel Fabrication Facility, 5801 Bluff Road, Hopkins, South Carolina, February 7, 2014.

AECOM, 2019a. Final Remedial Investigation Work Plan, Westinghouse Columbia Fuel Fabrication Facility, 5801 Bluff Road, Hopkins, South Carolina, June 2019.

AECOM, 2019b. Preliminary Human Health Risk Assessment, Westinghouse Columbia Fuel Fabrication Facility, 5801 Bluff Road, Hopkins, South Carolina, March 2019.

JUSTIA US Law website (USA/SCDHEC vs SCRDI et al. lawsuit), http://law.justia.com/cases/federal/district-courts/FSupp/653/984/2400694/, reviewed by Mr. Jeremy Grant of AECOM on September 24, 2017.

Rust, 1995. Conceptual Design Report, Westinghouse Commercial Fuel Division, Columbia, South Carolina, September 8, 1995.

S&ME, 1982. Ground-Water Hydrology of the Westinghouse Electric Corporation Plant, Richland County, South Carolina, March 1, 1982.

AECOM 12

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility Tables AECOM

Table 1 Monitoring Well Construction Details Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Ground Top of Casing Well Screen Screen Date Surface Casing Total Depth Well Number Northing Easting Stickup Diameter Casing Type Length Interval Classification Installed Elevation Elevation (ft bgs)

(ft) (in) (ft) (ft bgs)

(ft msl) (ft msl)

RW-1 NS NS 4/1/1995 NS NS NS 4.0 Steel 30.00 10 19.20-30 Black Mingo W-RW2 745325.1547 2023458.2190 3/10/1995 136.98 139.93 2.95 4.0 Steel 32.30 10 19-29.2 Lower Surficial W-3A 744340.2273 2023926.2926 6/11/1985 117.64 120.08 2.44 2.0 PVC 82.50 10 72.5-82.5 Black Mingo W-4 744343.6686 2023959.5730 1977 116.50 116.09 -0.41 4.0 PVC 12.00 2 10-12 Upper Surficial W-6 744963.2941 2024109.6154 5/15/1980 136.96 136.46 -0.50 2.0 PVC 28.50 5 23.5-28.5 Lower Surficial W-7A 744907.4275 2023872.2237 2/19/1992 132.94 135.06 2.12 2.0 PVC 18.00 5 13-18 Upper Surficial W-10 744897.8502 2023659.8964 5/14/1980 136.89 136.81 -0.08 2.0 PVC 23.50 5 18.5-23.5 Upper Surficial W-11 744743.0468 2023914.5566 5/14/1980 138.45 140.76 2.31 2.0 PVC 28.50 3 25.5-28.5 Lower Surficial W-13R 744648.7070 2024279.2522 10/8/2010 136.38 136.13 -0.25 2.0 PVC 20.00 5 15-20 Upper Surficial W-14A 744603.1956 2024478.6507 5/4/1988 136.22 137.83 1.61 2.0 PVC 28.50 5 23.5-28.5 Upper Surficial W-15 744663.4226 2023716.7929 5/15/1980 126.67 127.90 1.23 2.0 PVC 18.50 5 13.5-18.5 Upper Surficial W-16 744602.3196 2024060.2560 5/15/1980 125.64 124.93 -0.71 2.0 PVC 18.50 3 15.5-18.5 Upper Surficial W-17 745055.2186 2023785.3818 5/30/1980 137.57 139.27 1.70 2.0 PVC 28.00 5 23.5-28 Lower Surficial W-18R 745012.6889 2023939.2527 Unknown 137.15 136.71 -0.44 2.0 PVC 17.50 5 12.5-17.5 Upper Surficial W-19B 746172.6764 2022552.9543 3/17/1995 140.58 142.85 2.27 4.0 PVC 40.50 10 30-40.5 Lower Surficial W-20 743739.6310 2022975.3834 7/10/1980 113.27 116.16 2.89 2.0 PVC 16.30 5 11.5-16.3 Upper Surficial W-22 744960.9243 2024116.3963 7/12/1980 137.08 136.51 -0.57 2.0 PVC 17.80 5 13.4-17.8 Upper Surficial W-23R 744674.7363 2024851.2620 7/22/2011 137.45 140.47 3.02 2.0 PVC 20.50 5 15.5-20.5 Upper Surficial W-24 746742.5552 2027344.7554 7/9/1980 139.83 141.94 2.11 2.0 PVC 15.10 5 10.1-15.1 Upper Surficial W-25 742114.3330 2022728.9859 7/9/1980 114.70 114.70 0.00 2.0 PVC 27.70 5 22.9-27.7 Upper Surficial W-26 744855.2926 2023417.6899 7/11/1980 140.59 142.21 1.62 2.0 PVC 30.50 5 25.5-30.5 Upper Surficial W-27 744383.9028 2023708.2286 7/13/1980 120.22 121.87 1.65 2.0 PVC 18.90 5 14.1-18.9 Upper Surficial W-28 745121.7794 2024317.4127 7/13/1980 136.98 138.88 1.90 2.0 PVC 14.70 5 9.8-14.7 Upper Surficial W-29 745182.7704 2024101.6410 7/12/1980 136.96 138.61 1.65 2.0 PVC 15.10 5 10-15.1 Upper Surficial W-30 745095.1563 2024150.8369 7/11/1980 136.87 138.81 1.94 2.0 PVC 15.20 5 10.2-15.2 Upper Surficial W-32 744742.1011 2023919.8088 7/15/1980 138.33 140.61 2.28 2.0 PVC 22.50 5 17-22.5 Upper Surficial W-33 745402.9946 2023548.6640 7/15/1980 138.06 139.33 1.27 2.0 PVC 20.70 5 15.1-20.7 Lower Surficial W-35 745716.6972 2024227.9328 2/18/1992 136.59 139.07 2.48 2.0 PVC 21.00 5 16-21 Upper Surficial W-36 746084.8252 2024573.1745 2/19/1992 134.16 136.29 2.13 2.0 PVC 20.00 5 15-20 Upper Surficial W-37 745407.3901 2024230.7318 2/11/1992 136.58 139.04 2.46 2.0 PVC 20.50 5 15.5-20.5 Upper Surficial W-38 745250.3065 2024192.9679 2/18/1992 136.71 136.51 -0.20 2.0 PVC 20.00 5 15-20 Upper Surficial W-39 745587.4130 2023656.6724 1/27/1994 139.08 141.15 2.07 2.0 PVC 22.00 10 12-22 Upper/Lower Surficial W-40 745646.5324 2024112.4795 7/18/1984 136.42 139.26 2.84 2.0 PVC 15.00 10 5-15 Upper Surficial W-41R 745372.8885 2023252.5925 Unknown 131.02 133.81 2.79 2.0 PVC 24.00 10 14-24 Upper Surficial W-42 745072.3463 2023203.3177 1/27/1994 137.83 140.96 3.13 2.0 PVC 30.00 10 20-30 Upper Surficial Page 1 of 2

Table 1 Monitoring Well Construction Details Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Ground Top of Casing Well Screen Screen Date Surface Casing Total Depth Well Number Northing Easting Stickup Diameter Casing Type Length Interval Classification Installed Elevation Elevation (ft bgs)

(ft) (in) (ft) (ft bgs)

(ft msl) (ft msl)

W-43 745904.3053 2023600.1186 1/27/1994 138.09 141.33 3.24 2.0 PVC 20.50 10 10.5-20.5 Upper Surficial W-44 745579.8931 2022950.1077 2/1/1994 131.93 134.86 2.93 2.0 PVC 26.00 10 16-26 Lower Surficial W-45 745644.0322 2024296.0965 7/18/1984 137.20 140.02 2.82 2.0 PVC 16.00 10 6-16 Upper Surficial W-46 745154.5936 2023494.4570 3/27/1995 132.39 134.74 2.35 4.0 PVC 25.50 10 15.5-25.5 Upper Surficial W-47 744633.7657 2023515.8706 3/31/1995 140.70 141.90 1.20 4.0 PVC 44.80 10 34.3-44.8 Lower Surficial W-48 744913.2226 2023290.4438 3/30/1995 139.74 142.56 2.82 4.0 PVC 41.30 10 30.7-41.3 Lower Surficial W-49 745073.2286 2023192.6302 3/15/1995 137.82 140.25 2.43 2.0 PVC 115.00 10 105-115 Black Mingo W-50 745637.2219 2024107.3993 3/21/1995 136.79 139.58 2.79 2.0 PVC 124.50 10 114.5-124.5 Black Mingo W-51 745583.8582 2024270.8300 9/19/2018 136.67 136.51 -0.16 2.0 PVC 15.00 5 10-15 Upper Surficial W-52 745542.3624 2024260.1657 9/19/2018 136.71 136.19 -0.52 2.0 PVC 15.00 5 10-15 Upper Surficial W-53 745495.9968 2024247.5619 9/19/2018 136.83 136.54 -0.29 2.0 PVC 15.00 5 10-15 Upper Surficial W-54 745442.5511 2024229.9796 9/19/2018 136.79 136.52 -0.27 2.0 PVC 15.00 5 10-15 Upper Surficial W-55 745397.6509 2024214.0049 9/20/2018 136.90 136.63 -0.27 2.0 PVC 15.00 5 10-15 Upper Surficial W-56 745351.3097 2024203.7460 9/20/2018 136.83 136.68 -0.15 2.0 PVC 15.00 5 10-15 Upper Surficial W-57 745307.4270 2024190.7853 9/20/2018 136.90 136.73 -0.17 2.0 PVC 15.00 5 10-15 Upper Surficial W-58 745254.0864 2024176.3347 9/18/2018 136.85 136.37 -0.48 2.0 PVC 15.00 5 10-15 Upper Surficial W-59 745219.3681 2024165.8802 9/18/2018 136.10 136.42 0.32 2.0 PVC 15.00 5 10-15 Upper Surficial W-60 745835.5835 2023286.8131 10/8/2018 137.25 140.20 2.95 2.0 PVC 37.00 5 32-37 Lower Surficial W-61 745829.2570 2023288.2599 10/9/2018 137.34 140.60 3.26 2.0 PVC 23.00 10 13-23 Upper Surficial W-62 745485.4613 2022726.0792 10/9/2018 125.63 128.38 2.75 2.0 PVC 24.00 5 19-24 Lower Surficial W-63 745098.1342 2023019.4184 10/10/2018 138.78 141.02 2.24 2.0 PVC 42.00 5 37-42 Lower Surficial W-64 744643.8030 2023511.3331 10/10/2018 140.15 142.75 2.60 2.0 PVC 31.00 10 21-31 Upper Surficial W-65 745693.7040 2024027.4543 10/12/2018 138.17 140.95 2.78 2.0 PVC 31.50 5 26.5-31.5 Lower Surficial W-66 745687.8186 2024027.1699 10/12/2018 138.01 140.91 2.90 2.0 PVC 22.00 10 12-22 Upper Surficial W-67 744459.5852 2024485.7938 10/15/2018 132.60 135.26 2.66 2.0 PVC 31.00 10 21-31 Upper Surficial W-68 745329.2457 2022496.217 11/1/2018 113.40 116.53 3.13 2.0 PVC 18.00 5 13-18 Lower Surficial Notes:

ft = feet in = inches ft msl = feet above mean sea level ft bgs = feet below ground surface NS - not surveyed Top of casing and ground surface elevations surveyed by AECOM during November 2018 Horizontal coordinates are referenced to the State Plane Coordinate System and the North American Datum of 1983 (NAD 83).

Vertical locations are referenced to the North American Vertical Datum of 1988 (NAVD 88).

Page 2 of 2

Table 2 Groundwater Levels and Elevations Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Ground Top of Surface Casing Depth to Groundwater Screen Well Date Elevation Elevation Water Elevation Interval Number Measured (ft) (ft ) (ft btoc) (ft) (ft bgs)

RW-1 NM NS NS NM NS 19.2-30 RW-2R 11/26/18 17.91 122.02 136.98 139.93 19.0-29.2 01/17/19 17.86 122.07 W-3A 11/26/18 4.66 115.42 117.64 120.08 72.5-82.5 01/17/19 4.01 116.07 11/26/18 3.41 112.68 W-4 116.50 116.09 10.0-12.0 01/17/19 2.04 114.05 11/26/18 9.65 126.81 W-6 136.96 136.46 23.5-28.5 01/17/19 9.44 127.02 11/26/18 10.58 124.48 W-7A 132.94 135.06 13.0-18.0 01/17/19 10.65 124.41 11/26/18 15.27 121.54 W-10 136.89 136.81 18.5-23.5 01/17/19 14.84 121.97 11/26/18 17.17 123.59 W-11 138.45 140.76 25.5-28.5 01/17/19 17.16 123.60 11/26/18 11.00 125.13 W-13R 136.38 136.13 15.5-18.5 01/17/19 10.81 125.32 11/26/18 15.65 122.18 W-14 136.22 137.83 23.5-28.5 01/17/19 16.13 121.70 11/26/18 11.25 116.65 W-15 126.67 127.90 13.5-18.5 01/17/19 11.24 116.66 11/26/18 3.60 124.30 W-16 125.64 124.93 15.5-18.5 01/17/19 1.73 126.17 11/26/18 13.57 125.70 W-17 137.57 139.27 23.5-28.0 01/17/19 13.51 125.76 11/26/18 10.90 125.81 W-18R 137.15 136.71 12.5-17.5 01/17/19 10.82 125.89 11/26/18 25.72 117.13 W-19B 140.58 142.85 30.0-40.5 01/17/19 24.65 118.20 11/26/18 5.77 110.39 W-20 113.27 116.16 11.5-16.3 01/17/19 6.15 110.01 11/26/18 9.70 126.81 W-22 137.08 136.51 13.4-17.8 01/17/19 9.61 126.90 11/26/18 19.10 121.37 W-23R 137.45 140.47 15.0-20.0 01/17/19 18.08 122.39 11/26/18 7.62 134.32 W-24 139.83 141.94 10.1-15.1 01/17/19 7.30 134.64 11/26/18 5.05 109.65 W-25 114.70 114.70 22.9-27.7 01/17/19 6.58 108.12 11/26/18 24.82 117.39 W-26 140.59 142.21 25.5-30.5 01/17/19 24.46 117.75 11/26/18 9.43 112.44 W-27 120.22 121.87 14.1-18.9 01/17/19 9.46 112.41 Page 1 of 3

Table 2 Groundwater Levels and Elevations Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Ground Top of Surface Casing Depth to Groundwater Screen Well Date Elevation Elevation Water Elevation Interval Number Measured (ft) (ft ) (ft btoc) (ft) (ft bgs) 11/26/18 11.30 127.58 W-28 136.98 138.88 9.8-14.7 01/17/19 11.14 127.74 11/26/18 10.95 127.66 W-29 136.96 138.61 10.0-15.1 01/17/19 10.82 127.79 11/26/18 11.30 127.51 W-30 136.87 138.81 10.2-15.2 01/17/19 11.17 127.64 11/26/18 17.93 122.68 W-32 138.33 140.61 17.0-22.5 01/17/19 17.95 122.66 11/26/18 15.02 124.31 W-33 138.06 139.33 15.1-20.7 01/17/19 14.92 124.41 11/26/18 10.40 128.67 W-35 136.59 139.07 16.0-21.0 01/17/19 9.99 129.08 11/26/18 7.10 129.19 W-36 134.16 136.29 15.0-20.0 01/17/19 6.58 129.71 11/26/18 10.71 128.33 W-37 136.58 139.04 15.5-20.5 01/17/19 10.35 128.69 11/26/18 8.70 127.81 W-38 136.71 136.51 15.0-20.0 01/17/19 8.55 127.96 11/26/18 15.02 126.13 W-39 139.08 141.15 12.0-22.0 01/17/19 14.95 126.20 11/26/18 10.60 128.66 W-40 136.42 139.26 5.0-15.0 01/17/19 10.23 129.03 11/26/18 15.32 118.49 W-41R 131.02 133.81 14.0-24.0 01/17/19 15.05 118.76 11/26/18 24.02 116.94 W-42 137.83 140.96 20.0-30.0 01/17/19 24.44 116.52 11/26/18 12.65 128.68 W-43 138.09 141.33 10.5-20.5 01/17/19 13.14 128.19 11/26/18 18.24 116.62 W-44 131.93 134.86 16.0-26.0 01/17/19 17.62 117.24 11/26/18 11.55 128.47 W-45 137.20 140.02 6.0-16.0 01/17/19 11.09 128.93 11/26/18 13.20 121.54 W-46 132.39 134.74 15.5-25.5 01/17/19 13.32 121.42 11/26/18 25.46 116.44 W-47 140.70 141.90 34.3-44.8 01/17/19 25.11 116.79 11/26/18 25.55 117.01 W-48 139.74 142.56 30.7-41.3 01/17/19 25.38 117.18 11/26/18 26.33 113.92 W-49 137.82 140.25 105.0-115.0 01/17/19 26.16 114.09 11/26/18 21.35 118.23 W-50 136.79 139.58 114.5-124.5 01/17/19 20.93 118.65 Page 2 of 3

Table 2 Groundwater Levels and Elevations Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Ground Top of Surface Casing Depth to Groundwater Screen Well Date Elevation Elevation Water Elevation Interval Number Measured (ft) (ft ) (ft btoc) (ft) (ft bgs) 11/26/18 7.97 128.54 W-51 136.67 136.51 10.0-15.0 01/17/19 7.53 128.98 11/26/18 7.80 128.39 W-52 136.71 136.19 10.0-15.0 01/17/19 7.39 128.80 11/26/18 8.13 128.41 W-53 136.83 136.54 10.0-15.0 01/17/19 7.76 128.78 11/26/18 8.20 128.32 W-54 136.79 136.52 10.0-15.0 01/17/19 7.83 128.69 11/26/18 8.38 128.25 W-55 136.90 136.63 10.0-15.0 01/17/19 8.01 128.62 11/26/18 8.50 128.18 W-56 136.83 136.68 10.0-15.0 01/17/19 8.02 128.66 11/26/18 8.74 127.99 W-57 136.90 136.73 10.0-15.0 01/17/19 8.31 128.42 11/26/18 8.92 127.45 W-58 136.85 136.37 10.0-15.0 01/17/19 8.52 127.85 11/26/18 8.70 127.72 W-59 136.10 136.42 10.0-15.0 01/17/19 8.64 127.78 11/26/18 22.46 117.74 W-60 137.25 140.20 32.0-37.0 01/17/19 21.49 118.71 11/26/18 17.39 123.21 W-61 137.34 140.60 13.0-23.0 01/17/19 16.72 123.88 11/26/18 13.49 114.89 W-62 125.63 128.38 19.0-24.0 01/17/19 12.92 115.46 11/26/18 25.85 115.17 W-63 138.78 141.02 37.0-42.0 01/17/19 26.04 114.98 11/26/18 25.76 116.99 W-64 140.15 142.75 21.0-31.0 01/17/19 25.39 117.36 11/26/18 12.59 128.36 W-65 138.17 140.95 26.5-31.5 01/17/19 12.30 128.65 11/26/18 12.36 128.55 W-66 138.01 140.91 12.0-22.0 01/17/19 11.98 128.93 11/26/18 16.76 118.50 W-67 132.60 135.26 21.0-31.0 01/17/19 16.39 118.87 11/26/18 5.36 111.17 W-68 113.40 116.53 13.0-18.0 01/17/19 5.33 111.20 Notes:

ft bgs = feet below ground surface ft btoc = feet below top of casing ft = elevations are in feet above mean sea level based on the North American Vertical Datum of 1988 (NAVD-88)

NS - not surveyed NM = not measured Page 3 of 3

Table 3 Summary of Groundwater Field Parameter Data Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Field Field pH Field Sp Cond DO ORP Well Sample Date Turbidity (S.U.) (µS/cm) (mg/L) (mV)

(NTU)

RW-1 4/16/2019 5.18 89 5.77 310.4 17.36 10/16/18 4.55 196 1.12 327 2.26 WRW-2 01/22/19 4.86 151 1.24 304 1.39 10/29/18 4.50 25 0.94 200 5.93 W-3A 11/29/18 4.55 26 0.65 203 1.26 01/29/19 4.75 23 1.33 165 2.40 Oct/Dec-18 Dry Dry Dry Dry Dry W-4 01/28/19 6.50 227 1.07 92 18.91 11/05/18 5.90 920 1.29 163 9.14 W-6 01/15/19 5.98 1350 0.64 292 4.95 10/19/18 6.86 329 0.44 215 1.94 W-7A 01/14/19 6.96 3270 0.31 209 0.49 06/04/19 6.98 3186 2.00 190 1.29 10/19/18 5.89 488 0.40 215 0.68 W-10 01/14/19 6.18 436 0.44 193 0.63 06/04/19 6.26 584 2.70 187 0.43 11/05/18 5.37 560 0.65 262 8.70 12/5/2018 5.45 610 0.73 259 5.43 W-11 01/11/19 5.35 585 1.00 248 25.63 06/05/19 4.98 478 4.80 257 7.58 10/19/18 6.12 760 0.49 184 6.63 W-13R 01/10/19 6.31 790 0.48 133 4.32 06/06/19 6.00 600 2.10 196 7.47 10/18/18 5.76 82 2.04 201 8.00 W-14 01/25/19 6.06 330 0.83 126 5.50 10/17/18 5.75 590 0.24 226 5.12 W-15 01/23/19 6.07 51 0.55 202 3.20 06/04/19 6.03 543 3.30 203 4.60 10/18/18 6.14 412 0.37 139 1.26 W-16 01/28/19 6.04 267 0.47 166 10.03 06/04/19 6.26 386 1.50 39 7.97 10/25/18 6.59 417 0.69 228 2.21 W-17 01/25/19 6.15 330 0.46 108 0.50 10/23/18 7.51 5050 1.69 163 6.53 W-18R 01/15/19 7.60 4520 2.16 239 1.26 11/04/18 5.00 85 4.79 284 1.29 W-19B 01/23/19 5.27 66 3.64 241 1.79 10/30/18 5.36 109 0.40 183 5.75 W-20 01/29/19 5.22 95 1.82 169 2.77 10/23/18 5.51 950 0.35 256 8.32 W-22 01/15/19 5.60 760 0.46 271 17.72 01/22/19 5.59 830 0.32 272 8.18 10/18/18 4.93 55 3.79 311 0.53 W-23R 01/28/19 4.85 51 3.48 203 3.45 10/16/18 5.11 52 0.50 114 7.83 W-24 01/25/19 4.99 39 0.94 145 9.01 Oct/Dec-18 NS NS NS NS NS W-25 01/30/19 6.26 116 0.20 79 54.45 Page 1 of 3

Table 3 Summary of Groundwater Field Parameter Data Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Field Field pH Field Sp Cond DO ORP Well Sample Date Turbidity (S.U.) (µS/cm) (mg/L) (mV)

(NTU) 10/16/18 5.42 216 0.66 264 12.54 W-26 01/24/19 5.59 199 0.58 198 2.13 10/29/18 6.25 377 0.44 -88 3.29 W-27 11/28/18 6.53 397 0.73 -80 4.19 01/29/19 6.28 336 0.40 -55 9.00 10/23/18 5.63 1020 0.46 246 3.35 01/18/19 5.91 880 0.54 238 2.76 W-28 04/16/19 6.12 732 0.90 277 2.40 07/11/19 6.15 721 10.60 270 1.24 10/23/18 8.57 550 0.44 147 1.85 W-29 01/10/19 8.76 492 0.36 148 0.31 10/23/18 6.39 650 0.66 171 2.68 W-30 01/15/19 6.54 650 0.40 186 1.31 10/19/18 6.83 2370 0.38 231.3 3.2 W-32 01/11/19 6.77 2220 0.60 217.3 8.08 06/05/19 6.84 2141 3.2 233.2 1.9 10/16/18 5.32 182 0.94 234 1.84 W-33 01/22/19 5.57 141 1.49 151 0.64 11/01/18 5.55 184 1.70 261 5.05 W-35 01/22/19 5.65 165 2.91 165 4.40 11/01/18 5.22 40 0.55 203.2 7.8 W-36 01/18/19 5.69 38 0.88 237.5 9.14 10/18/18 5.69 201 2.49 268 3.42 W-37 01/14/19 5.74 168 3.07 236 8.13 10/18/18 4.88 217 1.41 327 3.94 W-38 01/09/19 4.84 215 1.10 284 1.80 10/25/18 5.56 1090 2.41 255 2.81 W-39 01/21/19 5.41 71 2.11 185 3.83 11/29/19 6.23 102 6.72 222 9.13 W-40 01/24/19 6.38 80 8.86 143 42.60 10/18/18 5.23 580 3.17 273 3.03 W-41R 01/23/19 5.47 383 5.25 217 2.32 11/04/18 4.93 83 0.87 317 7.10 W-42 01/25/19 4.81 53 0.82 232 4.31 10/29/18 5.06 101 3.97 299 4.83 W-43 11/28/18 5.36 113 4.43 251 3.51 01/21/19 5.30 97 3.46 123 2.42 10/17/18 4.83 94 4.12 307 2.81 W-44 01/23/19 4.92 69 3.92 247 1.45 11/04/18 5.11 114 0.84 180 9.99 W-45 01/18/19 6.64 256 0.26 52 8.00 11/04/18 5.54 200 0.48 271 1.63 W-46 01/22/19 5.84 150 2.57 401 1.22 10/25/18 5.98 870 1.10 195 4.70 W-47 01/24/19 5.75 69 0.89 211 1.41 10/25/18 5.47 131 1.11 242 3.50 W-48 01/24/19 5.02 97 2.00 225 1.48 12/13/2018 4.26 32 0.51 169 6.90 W-49 01/29/19 4.94 29 2.29 145 9.20 Page 2 of 3

Table 3 Summary of Groundwater Field Parameter Data Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 Field Field pH Field Sp Cond DO ORP Well Sample Date Turbidity (S.U.) (µS/cm) (mg/L) (mV)

(NTU)

Oct/Dec-18 NS NS NS NS NS W-50 01/24/19 4.59 29 1.82 139 1.00 10/28/18 6.70 206 0.29 -142 8.86 W-51 01/25/19 6.67 195 0.25 -138 8.30 10/28/18 6.22 232 0.56 18 3.27 W-52 01/26/19 5.62 239 1.60 100 9.60 10/28/18 7.28 243 0.65 184 2.66 W-53 01/26/19 5.96 183 0.70 29 4.10 10/28/18 5.90 180 3.24 118 5.20 W-54 01/26/19 5.62 148 3.72 133 5.40 10/27/18 5.75 204 2.93 170 8.87 W-55 01/26/19 5.64 165 4.32 136 7.00 10/27/18 5.37 215 3.14 277 6.66 W-56 01/26/19 5.36 173 3.17 173 3.60 10/27/18 5.52 198 2.73 264 2.23 W-57 01/27/19 5.23 178 3.02 175 2.50 10/27/18 6.67 436 0.46 179 1.72 W-58 01/27/19 6.45 364 0.43 169 1.10 10/27/18 6.58 454 1.84 196 2.24 W-59 01/27/19 6.40 416 0.49 160 1.20 10/30/18 5.44 110 0.54 20 10.20 W-60 01/17/19 5.56 92 1.04 68 5.74 10/30/18 6.10 174 4.33 100 4.50 W-61 01/17/19 5.98 137 2.15 137 7.91 11/01/18 5.35 90 1.15 182 9.80 W-62 01/18/19 5.25 71 2.15 167 10.24 10/31/18 6.86 1267 0.29 -130 30.10 W-63 10/31/18 6.66 913 0.27 -104 13.80 01/17/19 7.33 78 0.81 -155 9.94 11/01/18 6.05 749 0.56 152 3.24 W-64 01/18/19 5.86 61 1.20 168 2.30 10/31/18 5.36 85 1.94 -24 0.00 W-65 01/21/19 6.82 359 0.75 -84 4.32 10/31/18 5.70 141 0.33 72 4.73 W-66 01/21/19 5.58 65 1.15 168 2.64 11/01/18 5.48 254 1.43 173 1.34 W-67 01/18/19 5.49 205 0.78 154 2.52 11/06/18 5.27 99 3.66 7 3.53 W-68 01/31/19 5.15 76 5.55 176 6.30 Notes:

S.U. = Standard Units

µS/cm = microSiemens per centimeter mg/L = milligrams per liter ORP = Oxidation Reduction Potential mV = millivolts Page 3 of 3

Table 4 Summary of Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 VOCs SVOCs Inorganics Radionuclides Carbon Disulfide cis-1,2-Dichloroethene Tetrachloroethene 2-Methylnaphthalene Ammonia NH3(N)

Ethylbenzene Trichloroethene Vinlyl Chloride 1,1-Biphenyl m Acenaphthene Naphthalene Phenanthrene Gross Alpha Isotopic U233/234 Isotopic U235/236 Isotopic U238 Isotopic U234 Isotopic U235 Isotopic U238 Chloroform Carbazole Nitrate NO3 Gross Beta Fluorene Well Sample Date Benzene Fluoride Total U Tc-99

µg/L

µg/L pCi/L ug/L µg/L mg/L *

µg/L µg/L µg/L mg/L pCi/L pCi/L ug/L µg/L ug/L µg/L µg/L pCi/L µg/L µg/L

µg/L µg/L mg/L pCi/L pCi/L

µg/L µg/L USEPA MCL 5 80 70 5 5 2 4 10 84~ 84~ 84~ 30 30 30 30 900 Action Level 15 50 RW-1 04/16/19 <1 <1 <1 <1 <1 1.3 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.104 0.044 2.5 <3.59 <0.396 <0.307 <0.401 <0.010 <0.010 <0.067 <0.067 5.56 <38.7 10/16/18 <1 <1 <1 <1 <1 190 7.0 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.098 0.0192 14 <3.35 NA NA NA <0.010 <0.010 <0.067 <0.067 7.07 NA WRW-2 01/22/19 <1 <1 <1 <1 <1 150 12 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.104 0.044 14 <3.77 0.323 0.366 0.495 <0.010 <0.010 0.079 J 0.079 J 9.11 <40 10/29/18 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Not Analyzed 0.0322 <0.020 <4.21 0.385 0.312 0.318 <0.010 <0.010 <0.067 <0.067 <4.81 <44.3 W3A 11/29/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.067 0.0241 NS NS NS NS NS NS NS NS NS NS NS 01/29/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.038 0.028 <0.020 <3.82 <0.306 <0.240 <0.194 <0.010 <0.010 <0.067 <0.067 <4.96 <29.4 Oct/Dec-18 Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry Dry W4 01/28/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.56 0.0269 8.4 <4.54 0.541 0.318 <0.158 <0.010 <0.010 0.143 J 0.143 J 28.6 <45.4 11/05/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.058 6.16 14 8.41 1.00 <0.344 <0.332 <0.01 <0.010 0.409 0.420 765 861 W6 01/15/19 <1 <1 <1 1.9 <1 10 1.8 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.136 60.5 150 34.6 0.397 <0.267 0.327 <0.010 <0.010 0.200 0.200 1,615 2370 10/19/18 <1 <1 <1 <1 <1 1.8 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 6.86 65 370 <3.38 *** Not Analyzed Not Analyzed Not Analyzed <0.010 <0.010 0.691 0.691 110 *** 175 W7A 01/14/19 <1 <1 <1 <1 <1 1.7 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 6.6 62.5 350 <8.92 0.559 <0.264 0.558 <0.010 <0.010 0.719 0.719 122.5 160 06/04/19 <1 <1 <1 <1 <1 2.1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 6.49 65.5 350 13.3 0.378 <0.343 <0.319 <0.010 <0.010 0.812 0.812 141.5 176 10/19/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.46 2.21 21 <4.78 NA NA NA <0.010 <0.010 0.0841 J 0.0841 J 68.7 90.0 W10 01/14/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.42 4.62 15 <4.64 <0.399 <0.322 <0.364 <0.010 <0.010 0.0854 J 0.0854 J 50.9 80.9 06/04/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.59 7.41 22 4.50 <0.384 <0.309 <0.275 <0.010 <0.010 0.114 J 0.114 J 66.4 88.7 11/05/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.01 4.59 57 7.82 <0.315 <0.153 <0.198 <0.010 <0.010 <0.067 <0.067 2,160 3570 12/05/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.00 6.4 63 14.2 <0.272 <0.34 <0.275 <0.010 <0.010 <0.067 <0.067 2,450 3640 W11 01/11/19 <1 <1 1.1 <1 <1 2.0 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.018 6.42 64 17.0 <0.497 <0.260 <0.368 <0.010 <0.010 0.192 J 0.192 J 1,810 4200 06/05/19 <1 <1 1.2 <1 <1 1.9 1.3 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.005 4.37 50 20.9 <0.177 <0.156 <0.126 <0.010 <0.010 0.0696 J 0.0696 J 2,060 2660 10/19/18 <1 <1 <1 1.4 <1 39 3.1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 8.79 38.8 24 <4.87 NA NA NA <0.010 <0.010 0.131 J 0.131 J 97.6 *** 149 W13R 01/10/19 <1 <1 <1 1.3 <1 46 3.7 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 8.29 31.8 21 <4.28 <0.387 <0.288 <0.211 <0.010 <0.010 0.149 J 0.149 J 73.5 111 06/06/19 <1 <1 <1 <1 <1 14 1.3 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 7.95 28.1 16 <4.65 <0.337 <0.284 <0.18 <0.010 <0.010 0.128 J 0.128 J 48.9 60.9 10/18/18 <1 <1 <1 <1 <1 35 5.3 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.025 0.175 3.3 <4.01 NA NA NA <0.010 <0.010 <0.067 <0.067 <3.62 NA W14 01/25/19 <1 <1 <1 <1 <1 9.9 2.1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.066 1.64 0.50 <4.05 <0.378 <0.382 <0.375 <0.010 <0.010 0.104 J 0.104 J 11.3 <31.0 10/17/18 <1 <1 <1 1.2 <1 11 2.0 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.86 13.1 44 <4.99 NA NA NA <0.010 <0.010 <0.067 <0.067 194.5 *** 265 W15 01/23/19 <1 <1 <1 <1 <1 8.4 1.6 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 2.26 18.4 49 4.48 *** <0.304 <0.287 <0.296 <0.010 <0.010 <0.067 <0.067 145.5 *** 233 06/04/19 <1 <1 <1 1.2 <1 13 2.3 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.92 13.4 44 <4.99 <0.337 <0.258 <0.113 <0.010 <0.010 0.103 J 0.103 J 186 281 10/18/18 <1 <1 <1 3.2 <1 11 2.9 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 8.62 18.2 4.6 <4.97 NA NA NA <0.010 <0.010 <0.067 <0.067 17.2 NA W16 01/28/19 <1 <1 <1 1.2 <1 6.4 1.7 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 7.61 15.3 3.0 5.21 <0.401 <0.305 <0.380 <0.010 <0.010 0.113 J 0.113 J 15.4 <30.5 06/04/19 <1 <1 <1 1.5 <1 9.6 2.4 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 8.36 17.1 3.8 <4.47 <0.412 <0.346 <0.243 <0.010 <0.010 0.0846 J 0.0846 J 18.3 <35.9 10/25/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.02 12.9 4.5 <4.87 NA NA NA <0.010 <0.010 0.157 J 0.157 J 254 *** 348 W17 01/25/19 <1 <1 <1 <1 <1 1.7 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 2.44 5.58 12 <3.84 <0.336 <0.321 <0.287 <0.010 <0.010 0.0939 J 0.0939 J 308 476 10/23/18 <1 <1 1.6 <1 <1 2.8 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.8 86.5 710 14.3 *** 1.85 <0.303 1.19 <0.010 0.0453 J 4.42 4.47 131 *** 208 W18R 01/15/19 <1 <1 1.4 <1 <1 2.2 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 5.56 95.0 750 <17.65 4.62 0.528 2.07 <0.010 0.062 J 5.03 5.09 123.5 168 11/04/18 <5 <5 <5 <5 <5 120 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.016 0.0202 4.3 <3.69 <0.311 <0.278 <0.268 <0.010 <0.010 <0.067 <0.067 <3.68 <45.7 W19B 01/23/19 <1 <1 <1 <1 <1 92 1.9 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.024 0.0839 3.8 4.23 0.525 0.138 0.297 <0.010 <0.010 <0.067 <0.067 <4.77 <39.8 10/30/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.048 0.027 <0.020 <3.86 NA NA NA <0.010 <0.010 <0.067 <0.067 <3.55 NA W20 01/29/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.049 0.0396 0.035 <4.55 <0.374 <0.333 <0.287 <0.010 <0.010 <0.067 <0.067 <4.49 <32.2 10/23/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.59 35.1 71 <4.81 NA NA NA <0.010 0.0128 J 0.698 0.711 17.1 NA W22 1/15/2019 - 1/22/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 5.16 27.4 59 <4.99 1.18 0.437 0.672 <0.010 0.0138 J 0.696 0.710 18.2 <28.8 10/18/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.139 0.0612 0.81 <4.13 NA NA NA <0.010 <0.010 <0.067 <0.067 <4.43 NA W23R 01/28/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.011 0.0191 1.2 <4.09 <0.280 <0.305 <0.284 <0.010 <0.010 <0.067 <0.067 <3.48 <30.2 10/16/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.025 0.0182 0.042 <4.32 NA NA NA <0.010 <0.010 <0.067 <0.067 <4.85 NA W24 01/25/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.026 0.0207 0.13 <4.30 <0.252 <0.290 <0.171 <0.010 <0.010 <0.067 <0.067 <3.28 <29.7 Oct/Dec-18 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS W25 01/30/19 <5 <5 <5 <5 <5 <5 <5 <5 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.101 1.14 <0.020 <4.43 0.640 <0.376 0.466 <0.010 <0.010 0.419 0.419 5.32 <47.6 10/16/18 <1 <1 <1 1.1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.63 1.24 3.5 <4.92 NA NA NA <0.010 <0.010 0.0947 J 0.0947 J 12.5 NA W26 01/24/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.59 1.53 3.3 <4.49 <0.373 <0.241 <0.301 <0.010 <0.010 <0.067 <0.067 13.4 <34.7 11/28/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.65 8.43 0.037 4.36 0.268 0.243 0.262 <0.010 <0.010 <0.067 <0.067 8.85 <40 W27 01/29/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.33 6.96 0.029 <4.88 <0.337 <0.279 <0.288 <0.010 <0.010 <0.067 <0.067 6.18 <35.5 10/23/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.63 0.721 7.8 <4.97 NA NA NA <0.010 0.0106 J 0.531 0.541 7.30 NA 01/18/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 5.16 0.442 7.2 <6.04 0.369 <0.243 <0.304 <0.010 <0.010 0.456 0.456 7.28 <30.9 W28 04/16/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 5.16 0.442 7.4 <6.04 0.369 <0.243 <0.304 <0.010 0.013 J 0.491 0.504 7.28 <30.9 07/11/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 5.16 0.442 7.4 <4.77 0.806 <0.368 0.295 <0.010 0.0117 J 0.573 0.585 8.47 <42.9 10/23/18 <1 <1 <1 <1 <1 1.5 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 9.69 29 7.3 <4.69 NA NA NA <0.010 0.0385 J 2.24 2.28 3.98 NA W29 01/10/19 <1 <1 <1 <1 <1 1.6 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 7.94 22 6.4 5.04 1.38 <0.319 0.746 <0.010 0.0333 J 2.17 2.21 <3.96 <29.8 10/23/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 8.94 1.49 47 23.7 *** 15.0 0.509 4.40 <0.010 0.298 12.4 12.7 26.5 *** NA W30 01/15/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 9.06 0.956 45 38.6 29.3 2.83 10.1 <0.010 0.533 22.4 22.9 30.8 <33.8 10/19/18 <1 <1 <1 <1 <1 1.5 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.61 62.5 240 4.23 *** NA NA NA <0.010 <0.010 0.223 0.223 127 *** 259 W32 01/11/19 <1 <1 <1 <1 <1 1.3 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.26 54.5 210 8.41 0.360 <0.210 <0.307 <0.010 <0.010 0.296 0.296 176 307 06/05/16 <1 <1 <1 <1 <1 1.6 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.56 53.5 210 8.88 0.325 <0.158 <0.261 <0.010 <0.010 0.310 0.310 206 273 10/16/18 <1 <1 <1 2.0 <1 190 17 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.187 0.0112 10 <4.81 NA NA NA <0.010 <0.010 <0.067 <0.067 5.22 NA W33 01/22/19 <1 <1 <1 <1 <1 140 18 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.193 0.054 10 <2.30 <0.307 <0.289 <0.234 <0.010 <0.010 <0.067 <0.067 <3.32 <29.4 AECOM Page 1 of 3

Table 4 Summary of Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 VOCs SVOCs Inorganics Radionuclides Carbon Disulfide cis-1,2-Dichloroethene Tetrachloroethene 2-Methylnaphthalene Ammonia NH3(N)

Ethylbenzene Trichloroethene Vinlyl Chloride 1,1-Biphenyl m Acenaphthene Naphthalene Phenanthrene Gross Alpha Isotopic U233/234 Isotopic U235/236 Isotopic U238 Isotopic U234 Isotopic U235 Isotopic U238 Chloroform Carbazole Nitrate NO3 Gross Beta Fluorene Well Sample Date Benzene Fluoride Total U Tc-99

µg/L

µg/L pCi/L ug/L µg/L mg/L *

µg/L µg/L µg/L mg/L pCi/L pCi/L ug/L µg/L ug/L µg/L µg/L pCi/L µg/L µg/L

µg/L µg/L mg/L pCi/L pCi/L

µg/L µg/L USEPA MCL 5 80 70 5 5 2 4 10 84~ 84~ 84~ 30 30 30 30 900 Action Level 15 50 11/01/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.026 0.0147 5.5 <3.51 <0.304 <0.307 <0.249 <0.010 <0.010 <0.067 <0.067 <4.35 <39 W35 01/22/19 <1 <1 <1 <1 <1 2.1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.007 0.0449 4.2 <3.71 <0.272 <0.240 0.489 <0.010 <0.010 <0.067 <0.067 <4.97 <40.2 11/01/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.005 0.0527 0.27 <3.71 <0.357 <0.267 <0.35 <0.010 <0.010 <0.067 <0.067 <3.4 <39.5 W36 01/18/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.005 0.0408 0.055 <3.46 0.433 0.240 <0.222 <0.010 <0.010 <0.067 <0.067 <4.52 <42.2 W37 10/18/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.03 0.0268 2.8 <4.37 NA NA NA <0.010 <0.010 <0.067 <0.067 <3.57 NA 01/14/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.01 0.0218 3.6 <2.99 <0.280 <0.260 0.238 <0.010 <0.010 <0.067 <0.067 <4.69 <43.6 10/18/18 <1 <1 <1 <1 <1 3.6 11 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.127 0.0268 5.6 <3.77 NA NA NA <0.010 <0.010 0.196 J 0.196 J <2.94 NA W38 01/09/19 <1 <1 <1 <1 <1 3.2 9.5 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.104 0.0321 5.0 <3.63 0.606 0.210 0.309 <0.010 <0.010 0.197 0.197 <4.49 <42.4 10/25/18 <5 <5 <5 <5 <5 300 <5 <5 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.099 0.0318 120 <4.90 NA NA NA <0.010 <0.010 <0.067 <0.067 12.1 NA W39 01/21/19 <1 <1 <1 3.8 <1 190 3.5 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.009 0.067 96 <4.86 0.367 0.340 <0.234 <0.010 <0.010 <0.067 <0.067 12.6 <42.7 11/29/19 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.124 0.0203 4.6 6.93 <0.225 <0.198 <0.16 <0.010 <0.010 0.067 0.067 5.20 <36.4 W40 01/24/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.164 0.0552 2.6 3.21 0.519 <0.302 0.409 <0.010 <0.010 0.142 J 0.142 J <4.66 <48.4 10/17/18 <5 <5 <5 <5 <5 310 23 <5 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.041 0.033 55 <4.89 NA NA NA <0.010 <0.010 <0.067 <0.067 12.1 NA W41R 01/23/19 <1 <1 <1 5.0 <1 200 6.9 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.056 0.0777 44 <4.32 0.281 <0.300 <0.182 <0.010 <0.010 <0.067 <0.067 8.44 <41.1 11/04/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.49 0.429 4.0 <3.5 <0.329 <0.271 <0.339 <0.010 <0.010 <0.067 <0.067 <2.98 <40.6 W42 01/25/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.51 0.153 3.6 <3.39 0.376 0.420 0.280 <0.010 <0.010 <0.067 <0.067 8.61 <41.4 11/28/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.020 0.0196 7.1 <3.97 0.331 0.280 0.274 <0.010 <0.010 <0.067 <0.067 <4.79 <38.5 W43 01/21/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.008 0.0316 9.0 <4.53 0.727 0.443 0.246 <0.010 <0.010 <0.067 <0.067 3.36 <41.4 10/17/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.019 0.017 3.5 <4.65 NA NA NA <0.010 <0.010 <0.067 <0.067 <4.87 NA W44 01/23/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.046 0.091 2.9 <4.22 <0.379 <0.342 <0.287 <0.010 <0.010 <0.067 <0.067 4.49 <42.1 W45 11/04/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 0.9 <0.8 0.861 0.409 0.95 4.47 3.55 0.371 0.907 <0.010 0.0586 2.53 2.59 <4.69 <39.2 01/18/19 2.8 <1 <1 <1 6.6 <1 <1 <1 7.2 7.2 1.5 6.6 2.4 18 1.4 0.614 1.390 0.74 5.34 1.35 0.351 0.541 <0.010 0.0244 J 1.02 1.05 <4.96 <43.5 11/04/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.033 0.0144 7.6 <3.57 <0.306 <0.268 <0.255 <0.010 <0.010 <0.067 <0.067 48.6 49.7 W46 01/22/19 <1 <1 <1 <1 <1 1.7 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.015 0.0569 7.6 <4.75 <0.386 0.270 0.362 <0.010 <0.010 <0.067 <0.067 41.3 <41.4 10/25/18 <1 <1 <1 <1 <1 3.1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4 22.9 84 <4.75 NA NA NA <0.010 <0.010 0.0797 J 0.0797 J 105 *** 113 W47 01/24/19 <1 <1 <1 <1 <1 2.4 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.23 20 71 5.21 *** 0.382 <0.256 0.283 <0.010 <0.010 <0.067 <0.067 91.2 *** 97.8 10/25/18 <1 <1 <1 2.2 <1 150 4.9 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.529 0.0322 5.3 <4.09 NA NA NA <0.010 <0.010 0.0922 J 0.0922 J 14.8 NA W48 01/24/19 <1 <1 <1 2.1 <1 180 5.1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.341 0.0678 5.0 3.90 0.294 0.425 <0.195 <0.010 <0.010 <0.067 <0.067 15.7 <39.7 12/13/18 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.011 0.0235 <0.020 <4.6 <0.382 <0.488 <0.418 <0.010 <0.010 0.104 J 0.104 J <4.57 <41.6 W49 01/29/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.003 0.0152 <0.020 3.87 <0.361 <0.270 <0.260 <0.010 <0.010 0.0731 J 0.0731 J <3.28 <41.8 Oct/Dec-18 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS W50 01/24/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.006 0.0609 <0.020 <3.17 0.685 0.265 <0.245 <0.010 <0.010 0.0876 J 0.0876 J <4.23 <39.9 W51 10/28/18 <5 <5 <5 <5 <5 <5 <5 <2 13 <0.8 <0.8 4.5 <0.8 <0.8 1.8 0.304 0.274 0.030 <3.85 0.161 <0.105 <0.150 <0.010 <0.010 <0.067 <0.067 4.67 <43.5 01/25/19 <1 <1 <1 <1 2.7 <1 <1 <1 12 <0.8 <0.8 4.9 1.3 4.2 1.8 0.258 0.1 0.023 <3.97 <0.294 <0.319 <0.193 <0.010 <0.010 <0.067 <0.067 <4.45 <43.5 10/28/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.957 0.0476 2.3 <4.57 0.146 <0.0895 <0.105 <0.010 <0.010 <0.067 <0.067 6.58 <42.3 W52 01/26/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.08 0.0342 2.4 <3.14 0.368 <0.211 <0.197 <0.010 <0.010 <0.067 <0.067 <4.17 <42.2 10/28/18 <5 <5 <5 19 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.262 0.0611 0.67 4.68 0.199 <0.172 <0.130 <0.010 <0.010 0.0784 J 0.0784 J 7.06 <41.0 W53 01/26/19 <1 <1 <1 46 <1 4.6 <1 2.1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.069 0.0412 0.063 <3.2 0.376 <0.215 <0.232 <0.010 <0.010 <0.067 <0.067 <4.09 <39.7 10/28/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.264 0.0198 2.9 <3.31 <0.201 <0.0862 0.118 <0.010 <0.010 <0.067 <0.067 <4.46 <41.9 W54 01/26/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.153 0.0083 3.0 <3.47 0.779 0.286 0.405 <0.010 <0.010 <0.067 <0.067 <4.04 <37.2 10/27/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.06 0.0342 3.3 425 *** 308 15.4 64.8 0.0519 6.07 181 187 64.2 *** <40.9 W55 01/26/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.065 0.0059 3.5 466 *** 283 19.1 69.4 0.0459 J 5.60 172 178 84 *** <39 10/27/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.135 0.0213 6.5 342 *** 274 13.5 58.8 0.0452 J 5.02 153 158 57.4 *** <42.4 W56 01/26/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.152 0.0078 4.1 257 *** 176 12.1 43.7 0.0343 J 4.05 128 132 57.1 *** <41.4 W57 10/27/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.068 0.0144 6.6 4.13 0.856 0.125 0.354 <0.010 0.019 J 0.591 0.610 <4.84 <43.5 01/27/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.0 0.0739 5.7 <3.39 0.570 <0.246 0.304 <0.010 <0.010 0.247 0.247 <3.67 <39.7 W58 10/27/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.117 14.8 16 <4.16 1.28 0.159 0.399 <0.010 0.0218 J 0.776 0.798 11.2 <41.1 01/27/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.1 17.9 11 7.03 3.04 0.500 1.17 <0.010 0.0444 J 1.51 1.55 5.66 <42.2 10/27/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.08 6.69 21 71.1 *** 51.7 2.70 11.1 <0.010 0.919 30.2 31.1 17.1 *** <41.4 W59 01/27/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.08 9.29 21 80.7 *** 42.7 3.19 10.1 <0.010 0.856 28.4 29.2 16.8 *** <37.8 10/30/18 <5 9.4 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.11 <3.45 <0.286 <3.45 <0.286 <0.144 <0.215 <0.010 <0.010 <0.067 <0.067 <3.55 <37.6 W60 01/17/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.007 0.0798 0.020 <3.47 0.409 0.290 0.452 <0.010 <0.010 <0.067 <0.067 <3.93 <37.2 10/30/18 <5 <5 5.2 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.086 0.0206 0.051 <3.49 <0.288 <0.287 <0.294 <0.010 <0.010 <0.067 <0.067 3.82 <38 W61 01/17/19 <1 <1 <1 <1 <1 <1 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.075 0.0408 0.48 <3.39 0.557 0.359 0.365 <0.010 <0.010 <0.067 <0.067 5.01 <42.8 11/01/18 <1 <1 <1 <1 <1 48 1.9 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.02 0.0177 3.6 <3.36 <0.322 <0.289 <0.278 <0.010 <0.010 0.0843 0.0843 <2.65 <42.2 W62 01/18/19 <1 <1 <1 <1 <1 51 1.9 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.01 0.0375 3.9 <3.44 <0.428 <0.347 <0.334 <0.010 <0.010 0.0831 J 0.0831 J <3.9 <36.8 10/31/18 <5 <5 <5 <5 <5 <5 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.474 0.0647 0.86 <4.99 0.755 <0.126 0.669 <0.010 <0.010 1.02 1.02 5.84 <40.6 W63 01/17/19 <1 <1 <1 <1 <1 1.4 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.502 0.0632 0.16 <4.68 0.669 <0.321 1.02 <0.010 <0.010 0.891 0.891 <4.35 <35.5 11/01/18 <1 <1 <1 <1 <1 1.5 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.26 20.7 49 <4.94 <0.292 <0.247 <0.199 <0.010 <0.010 0.140 0.140 76.3 74.7 W64 01/18/19 <1 <1 <1 <1 <1 1.8 <1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 4.32 21.9 61 <4.65 *** 0.516 0.261 0.211 <0.010 <0.010 <0.067 <0.067 88.5 *** 118 10/31/18 <25 25 25 25 <25 210 93 <10 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 3.08 0.0185 0.39 <3.57 <0.325 <0.268 <0.334 <0.010 <0.010 <0.067 <0.067 <3.61 <37.6 W65 01/21/19 <5 <5 <5 <5 <5 230 94 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.48 0.0329 0.40 <4.00 <0.389 <0.253 0.236 <0.010 <0.010 <0.067 <0.067 <4.00 <39.3 10/31/18 <5 5.0 <5 <5 <5 66 <5 <2 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 1.19 0.0687 18 <3.42 <0.288 <0.281 <0.261 <0.010 <0.010 <0.067 <0.067 <3.79 <38.4 W66 01/21/19 <5 <5 <5 <5 <5 200 11 <5 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.162 0.0231 2.0 <3.97 <0.454 <0.333 0.331 <0.010 <0.010 <0.067 <0.067 <3.60 <44.7 AECOM Page 2 of 3

Table 4 Summary of Groundwater Analytical Results Westinghouse Columbia Fuel Fabrication Facility AECOM Project No. 60595649 VOCs SVOCs Inorganics Radionuclides Carbon Disulfide cis-1,2-Dichloroethene Tetrachloroethene 2-Methylnaphthalene Ammonia NH3(N)

Ethylbenzene Trichloroethene Vinlyl Chloride 1,1-Biphenyl m Acenaphthene Naphthalene Phenanthrene Gross Alpha Isotopic U233/234 Isotopic U235/236 Isotopic U238 Isotopic U234 Isotopic U235 Isotopic U238 Chloroform Carbazole Nitrate NO3 Gross Beta Fluorene Well Sample Date Benzene Fluoride Total U Tc-99

µg/L

µg/L pCi/L ug/L µg/L mg/L *

µg/L µg/L µg/L mg/L pCi/L pCi/L ug/L µg/L ug/L µg/L µg/L pCi/L µg/L µg/L

µg/L µg/L mg/L pCi/L pCi/L

µg/L µg/L USEPA MCL 5 80 70 5 5 2 4 10 84~ 84~ 84~ 30 30 30 30 900 Action Level 15 50 11/01/18 <1 <1 <1 1.7 <1 41 8.4 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.063 1.26 17 <4.1 <0.306 <0.325 0.239 <0.010 <0.010 <0.067 <0.067 73.4 82.9 W67 01/18/19 <1 <1 <1 1.6 <1 38 8.1 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.008 1.41 17 <4.04 <0.397 0.314 0.410 <0.010 <0.010 <0.067 <0.067 67.5 114 11/06/18 <1 <1 <1 <1 <1 130 2.7 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.047 0.0264 3.4 <3.51 <0.328 <0.244 <0.289 <0.010 <0.010 0.0802 0.0802 <3.38 <37.4 W68 01/31/19 <1 <1 <1 <1 <1 150 2.5 <1 <4 <0.8 <0.8 <4 <0.8 <0.8 <0.8 0.009 0.0219 3.3 <3.42 0.440 0.368 0.398 <0.010 <0.010 <0.067 <0.067 <3.75 <45.0 Notes:

µg/L - Micrograms per liter

~ - Calculated value for comparison based on the site's specific uranium enrichment

• - PQL= 0.5 before May 2018 and 0.1 since

• • - PQL= 1.0 before May 2018 and 0.1 since LOQ - Limit of Quantification MCL - Maximum contaminent level MDC - Minimum detectable concentration mg/L - Milligrams per liter pCi/L - Picocuries per liter PQL - Practical Quantitation Limit RL - Reporting (Requested) Limit SCDHEC - South Carolina Department of Health and Environment Control USEPA - United States Environmental Protection Agency Beginning July 2018, Westinghouse procedure is to analyze Tc-99 for all samples with >50 pCi/L gross beta results.

J value is estimated, usually because it is above the detection limit but below the reporting limit

• • • - indicates an average of two analyses AECOM Page 3 of 3

2018/2019 Annual Groundwater Monitoring Report Westinghouse Columbia Fuel Fabrication Facility Figures AECOM

Legend 1 Mile Buffer of Facility Property Boundary 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 WWTP Discharge Location 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 LJG September 2019 FIGURE 1 Path: M:\EnvDataViz\Westinghouse\mxd\2019_WCFFF_RI_Work_Plan\sitelocationmap.mxd

Bl uf fR Legend oa d( Mill Creek Flow Direction SC Ditch Hw

?

y 48 Culvert

) Property Line k Culvert SCRDI Bluff Road (Superfund Site) ree Dominion Energy ll C Mill Creek Mi Substation Dike Location Culvert Eastern Ditch Western Ditch Middle Ditch Plant Building Wastewater Treatment Plant Mill Cre ek Gator Pond Upper Sunset Lake Lower Sunset Lake q

0 500 1,000 Feet 1:12,000 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 Man-Made Canal 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Property Map WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA FIGURE 2 PROJECT NO. PREPARED BY: DATE:

60595649 LJG August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\PropertyMap.mxd

?

Dominion Energy Substation Legend W-24 A  ?  ? Ditch

?

Culvert Culvert Mill Creek Flow Direction

?

Eastern Ditch

? EL East Lagoon

?  ??

NL North Lagoon

?  ?

?  ? SL South Lagoon

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

?

WL2 West Lagoon II

?

?

Groundwater Monitoring Wells Middle Ditch W-36 A  ?  ? @

A Upper Surficial Aquifer

? W-35 @

A Lower Surficial Aquifer RW-1

? Plant  ?

W-45 Building W-19B W-43 W-50 W-51 @

A Black Mingo Aquifer A A WL2 W-65 A W-52 W-60 W-66 @@ @

A@

A A @

A @ W-53 W-54  ? @

A Floodplain Well W-61 @ A A W-39 W-40 A @

A @

A A @

A W-37 W-55 A W-56 @ @

A A W-57 Mill Creek A W-58

?

W-33 W-59 @

A W-38 Property Line WL1 A W-44 A W-41R @ A W-29 @

A A@

A W-28 W-62 @ SCRDI Bluff Road (Superfund Site)

A A A W-30

@ SAN NL A A W-RW2 W-46 W-18R SL EL A  ? @ Dike Location

?  ? W-23R A W-17 @

@ A @ AW-6@

A@A W-22 W-68 W-63 W-7A  ? @

A A

AW-42 W-10 A@

AW-49 A

W-32 W-13R A W-14A W-48 @

A @ W-11@

A@

A W-16 @

A @

A A

W-26 W-15 @

A W-67 A @

A  ?

W-64@

A@ Gator  ?  ?

Upper Sunset A  ?

W-47 Pond W-4 Lake W-27 @

A W-3A A@

@A

?  ?

Lower Sunset  ?

Lake

?

W-20  ?

A q

0 300 600

? Feet 1:7,200 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet

? Datum: North American 1983 Mill Creek 101 Research Drive Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676

? Site Map

? WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY W-25 @ HOPKINS, SOUTH CAROLINA A

FIGURE 3 PROJECT NO. PREPARED BY: DATE:

60595649 LJG August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\SiteMap.mxd

?

?  ??

?

?

?

Legend Eastern Ditch  ? Ditch Culvert

?

Mill Creek Flow Direction

? EL East Lagoon

?

NL North Lagoon

?

SL South Lagoon SAN Sanitary Lagoon

? Northern  ? WL1 West Lagoon I Storage Area

?

Middle Ditch WL2 West Lagoon II Mill Creek

? Dike Location Operable Units

?

Plant Former Oil House Building Chemical Area Mechanical Mechanical Area Area Northern Storage Area Sanitary Lagoon Area West WL2  ?

Western  ?  ?

GW AOC Lagoons Southern Storage Area Area Wastewater Treatment Area Western Storage Area West Lagoons Area

?

Eastern Ditch Western Storage Area Chemical Area WL1 Western GW AOC Wastewater Treatment

?  ?

SAN Area NL

? Sanitary

?  ? Lagoon SL EL Area

?  ? Southern Storage Area

?

q 0 150 300

? Feet  ?

?  ? 1:3,600 GATOR

?  ?

Upper Sunset Lake POND Map Projection: NAD 1983, South Carolina State Plane,

? FIPS 3900, Feet Datum: North American 1983 101 Research Drive Columbia, SC 29203 Lower Sunset Lake

? T: (803) 254-4400 F: (803) 771-6676 Operational Units Map

? WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY HOPKINS, SOUTH CAROLINA FIGURE 4 PROJECT NO. PREPARED BY: DATE:

60595649 LJG August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\OperationUnitsMap.mxd

?

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location Potentiometric Line (C.I. = 4 feet, dashed where inferred)

W-19B Direction of Groundwater Flow A W-36 129.19  ? Ditch A Culvert W-43 129.19 Groundwater Elevation 128.68 EL East Lagoon A

W-60 NL North Lagoon A W-40 128.66 W-35 Plan SL South Lagoon W-61 128.67 Build t W-65 WL2 123.21 @

A ing SAN Sanitary Lagoon RW-1 W-39*

A W-66 @

A WL1 West Lagoon 1 W-44 126.13 128.55 @

A A @ W-45 A

W-51 W-50 128.54 128.47 WL2 West Lagoon 2 A @

A @

A W-62 W-53 A@ W-52 128.41 A @ 128.39 A

W-54 128 Note:

W-41R W-33 W-55 A @ 128.32 118.49 128.25 A W-37 A A@@ Based upon data collected on November 26, 2018 W-68 @

A WL1 128.33 RW-2R @

A W-56 W-57

• : Monitoring well W-39 is screened within the upper A @

A 128.18 W-58 127.99 A@

127.45 W-38 and lower surficial aquifer W-46 A@ 127.81 A

W-29 @

A 121.54 SAN 127.66 A W-59 W-42 @

A 127.72 q

W-49 116.94 W-30 NL @

A A W-17 W-18R @ 127.51 A W-28 W-63 @

A A 127.58 A 125.81 SL A EL W-10 W-6 W-48 121.54 @

A A W-22 W-26 W-7A A 117.39 126.81 A @

A 124.48 A 124 12 W-32 0

W-11 122.68 W-64 W-15 @

A

@ W-23R A W-13R 121.37 116.99 116.65 W-16 125.13 W-14 A @

A A NM @

A 122.18 A

W-47 @

A @

A Upper 116 W-67 Sunset Lake Pond 118.50 W-27 @

A 0 150 300 112.44 W-4 Feet A W-3A 112.68 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Upper Surficial Aquifer Potentiometric Map November 2018 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 5 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F5 UpperSurfical_Pot-Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location Potentiometric Line (C.I. = 4 feet)

W-19B 117.13 Direction of Groundwater Flow A  ? Ditch W-36 Culvert A

128.36 Groundwater Elevation W-43 EL East Lagoon W-60 @

A NL North Lagoon 117.74 A SL South Lagoon W-65 Plan W-61 W-35 SAN Sanitary Lagoon RW-1 Build t 128.36 WL2 128 @

A NM ing WL1 West Lagoon 1 A W-40 W-44 W-39* W-66 @

A W-45 116.62 126.13 @

A A @

A WL2 West Lagoon 2 A @

A W-50 @ W-51 A

W-62 W-52 A 114.89 @

Note:

A W-33 @ W-53 A

124.31 W-54 Based upon data collected on November 26, 2018 W-41R A

W-68 RW-2R @

A W-55 A

@ @ W-37 A

111.17

• : Monitoring well W-39 is screened within the upper A 122.02 WL1

@ W-56 A

A @

A W-57 and lower surficial aquifer 112 124 @

A q

116 W-58 A@ W-38 120 @A W-46 A

SAN W-29 W-59 W-28 W-63 @

A 115.17 @

A W-17 W-42 NL @

A A W-49 125.70 @ W-30 A

A A @

A W-18R SL W-48 A EL 117.01 W-10 W-7A @

A A

W-6 W-22 A W-26 @

A @

A 126.81 A

W-11 123.59 W-32 A

A W-23R W-64 W-15 W-13R A @

A A W-16 @

A W-14 A

Upper W-47 @

A @

A Sunset Lake 116.44 Pond W-67 A 0 150 300 W-27 Feet A W-3A W-4 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Lower Surficial Aquifer Potentiometric Map November 2018 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 6 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F6 LowerSurfical_Pot-Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location Potentiometric Line (C.I. = 2 feet)

W-19B @

A Direction of Groundwater Flow A W-36  ? Ditch Culvert 118.23 Groundwater Elevation A W-43 W-60 EL East Lagoon A W-61 NL North Lagoon Plan WL2 Build t W-35 SL South Lagoon W-65 ing A

W-66 @

A W-40 A

@ SAN Sanitary Lagoon W-50 @ RW-1 A A @ W-45 W-44 A WL1 West Lagoon 1 W-39 118.23 A @

A @ W-51 A WL2 West Lagoon 2 8 W-52 A 11 A @ W-53 A

W-62 W-54 A

@ W-37 Note:

A W-33 @

AA A W-41R WL1 W-55 Based upon data collected on November 26, 2018 W-RW2

@ W-56 A

W-68 A A W-57 A * : Monitoring well W-39 is screened within the upper W-58 W-38 W-59 @

A @

A and lower surficial aquifer A

W-29 A q

SAN W-46 A NL W-28 W-63 W-30 A

A W-42 @

A W-49 A A W-17 A

113.92 SL 114 A EL 116 W-18R W-6 @

A A W-22 W-48 @

A W-10 W-7A @

A A

A W-26 W-11 A

A W-64 W-32 W-15 @

A W-23R A

A @

A W-13R A W-47 W-16 W-14A Upper @

A @

A Sunset Lake Pond A W-67 0 150 300 W-3A Feet W-27 @

A 115.42 W-4 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Black Mingo Aquifer Potentiometric Map November 2018 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A W-20 HOPKINS, SOUTH CAROLINA FIGURE 7 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F7 BlackMingo_Pot-Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Potentiometric Line (C.I. = 4 feet, dashed where inferred)

A W-19B Direction of Groundwater Flow W-36

@ 129.71 A  ? Ditch Culvert W-43 129.71 Groundwater Elevation

@ 128.19 A

EL East Lagoon W-60 @

A W-61 123.88 W-35 NL North Lagoon W-40 129.08 Plan WL2 W-65 129.03 Build t ing SL South Lagoon A W-45 W-66 @

A RW-1 A 128.93 SAN Sanitary Lagoon 128.93 @

W-50 @

A A @ W-51 A

W-39 128.98 WL1 West Lagoon 1 A W-44 @ 126.20 A @ W-52 A

W-53 @ 128.80 WL2 West Lagoon 2 128.78 A

128 A W-62 @ W-54 A

W-55 128.69 A

128.62

@ W-37 Note:

W-41R @

A W-33 @A WL1 A 128.69

@ 118.76 A W-57 W-68 W-RW2

@ W-56 A Based upon data collected on January 17, 2019 A 128.42 A

W-58 @ 128.66 A * : Monitoring well W-39 is screened within the upper 127.85 A W-38

@@ 127.96 A and lower surficial aquifer W-29 A

SAN W-59 W-46 127.79 A 127.78

@ 121.42 A W-28 q

NL @ 127.74 A

W-63 @

A W-49 W-42 @ W-30 A 127.64 A

A 116.52 W-17 @

A W-18R SL 125.89 A

@ EL W-6 @ W-22 A

A W-48 W-10 W-7A 126.90 A @ 121.97 A @ 124.41 A

W-26

@ 117.75 A

W-32 W-64 W-11 @

A

@ 122.66 A

117.36 12 W-23R 11 W-15 4 W-13R @ 122.39 6 @ 116.66 A A A W-47 @ 125.32 A W-14 A W-16 Upper 0 @ NM A @

A 121.70 12 Sunset Lake Pond W-67

@ 118.87 A 0 150 300 W-27 Feet

@ 112.41 A 1:3,600

@ W-4

@A A

114.05 Map Projection: NAD 1983, South Carolina State Plane, W-3A FIPS 3900, Feet Datum: North American 1983 w

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Upper Surficial Aquifer Potentiometric Map January 2019 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A W-20 HOPKINS, SOUTH CAROLINA FIGURE 8 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F8 UpperSurfical_Pot-Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location W-19B Potentiometric Line (C.I. = 4 feet)

W-19B @

A 118.20 Direction of Groundwater Flow A W-36  ? Ditch Culvert 128.65 Groundwater Elevation W-60 @

A W-43 118.71 EL East Lagoon A W-61 NL North Lagoon W-35 Plan WL2 128 W-65 Build t SL South Lagoon 128.65 @

A RW-1 ing W-66 @

A W-40 NM SAN Sanitary Lagoon A

W-44 W-39 A

A @ W-45 A

117.24 WL1 West Lagoon 1 126.20 W-50 A @

A @ W-51 A WL2 West Lagoon 2 W-52 A W-62 @ W-53 A

115.46 @

A 124 W-54 W-33 @

A

@ W-37 Note:

A 124.41 W-55 A@A A W-41R WL1 W-RW2 @ W-56 A Based upon data collected on January 17, 2019 W-68 A@ @

A W-57 122.07 @

A 111.20

• : Monitoring well W-39 is screened within the upper 120 W-58 A

@ @ W-38 A and lower surficial aquifer A

W-29 A

@ W-59 q

SAN A W-46 W-63 116 NL @

A W-28 114.98 W-30 A W-49 W-42 W-17 @

A A

A 125.76 @

A SL A EL W-18R W-6 A@ W-22 A

W-48 127.02 117.18 @

A W-10 W-7A @

A A

A W-26 W-11 123.60 A

A W-32 W-15 A @

A W-23R W-64 @

A W-13R A

A W-47 @

A W-16 @

A W-14A Upper 116.79 Sunset Lake Pond A W-67 0 150 300 Feet W-27 @

A W-3A W-4 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Lower Surficial Aquifer Potentiometric Map January 2019 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A W-20 HOPKINS, SOUTH CAROLINA FIGURE 9 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F9 LowerSurfical_Pot-Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location Potentiometric Line (C.I. = 2 feet)

W-19B @

A Direction of Groundwater Flow A W-36  ? Ditch Culvert 118.65 Groundwater Elevation A W-43 W-60 EL East Lagoon A W-61 NL North Lagoon Plan WL2 Build t W-35 SL South Lagoon W-65 ing A

W-66 @

A W-40 A

@ SAN Sanitary Lagoon W-50 @ RW-1 A A @ W-45 W-44 A WL1 West Lagoon 1 W-39 118.65 A @

A @ W-51 A WL2 West Lagoon 2 W-52 A A 118 @ W-53 A

W-62 W-54 A

@ W-37 Note:

A W-33 W-55 A

@A A W-41R WL1 W-RW2

@ W-56 A Based upon data collected on January 17, 2019 W-68 A A W-57 A * : Monitoring well W-39 is screened within the upper W-58 W-38 W-59 A@ @

A and lower surficial aquifer A

W-29 A q

SAN W-46 A NL W-28 W-63 W-30 A

A W-42 @

A W-49 A A W-17 A

114.09 SL A EL W-18R W-6 @

A A W-22 W-48 @

A W-10 W-7A @

A A

A W-26 116 114 W-11 A

A W-32 W-15 @

A W-23R W-64 @

A @

A W-13R A

A W-47 A W-16 @

A W-14A Upper Sunset Lake Pond A W-67 0 150 300 W-3A Feet W-27 @

A 116.07 W-4 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Black Mingo Aquifer Potentiometric Map January 2019 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A W-20 HOPKINS, SOUTH CAROLINA FIGURE 10 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F10 BlackMingo_Pot-Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location PCE Isoconcentration Contours (µg/L)

W-19B

? Ditch A W-36

< 5.0 Culvert A

300 PCE Concentration in µg/L W-43 EL East Lagoon

< 5.0 NL North Lagoon W-60 @

A W-61 SL South Lagoon

< 5.0 A 5 W-35 SAN Sanitary Lagoon Plan

< 5.0 Build t W-65 WL2 W-40 @

A ing WL1 West Lagoon 1 A < 5.0 W-39* @

A W-45 West Lagoon 2 W-51 WL2 W-44 300 W-66 @

A A @ < 5.0 A

< 5.0

@ 66 A A W-53 @

A 0

10 W-62 W-50 < 5.0 A @ W-52

@ < 5.0 Note:

A MW-37 A NS W-54 W-41R W-33 W-55 < 5.0 A Based upon data collected from October-December, 2018 310 < 5.0 @ W-37 A @

AA W-68 < 1.0

• : Monitoring well W-39 is screened within the upper A RW-2R WL1 W-57

< 5.0

@ W-56 A

A @

A and lower surficial aquifer W-58 @ < 5.0 A

q

< 5.0 A @

W-46 A W-38

< 5.0 SAN W-29 @ W-59 3.6 A

1.5 A @ < 5.0 W-63 W-42 @

A W-49 < 5.0 NL @

A W-17 W-30 W-28 A W-18R @

A A

A < 1.0 < 1.0 A 2.8 SL A EL W-10 W-7A W-48 < 1.0 1.8 @

A A

W-26 W-22 A < 1.0 @

A @

A W-6 < 1.0 A

W-32 W-11 1.5 W-64 W-15 @

A

@ W-23R A W-13R < 1.0 1.5 11 5 W-16 39 W-14 A

A 10 11 @

A 35 A

A Upper @

A @

A W-47 W-67 Sunset Lake Pond 41 W-27 @

A 0 150 300

< 5.0 W-3A W-4 Feet A < 5.0 NS 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of PCE in Upper Surficial W-20 Aquifer October - December 2018

< 5.0 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 11 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F11 PCE_UpperSurf_Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location PCE Isoconcentration Contours (µg/L)

A W-19B  ? Ditch W-36 Culvert

<1.0 A

300 PCE Concentration in µg/L EL East Lagoon W-43 A <1.0 5 NL North Lagoon W-61 W-60 <1.0 SL South Lagoon A

W-35 W-40 Plan SAN Sanitary Lagoon 2.1 Build t WL2 W-66 W-65 <1.0

@ RW-1 ing West Lagoon 1 200 WL1 A W-45 A @

A <1.0 WL2 West Lagoon 2 W-39

@ W-50 A

@ @ W-51 A

0 A

A W-44 @

A 190 10 W-53 A <1.0 W-52 4.6 @

A <1.0 Note:

A W-62 A@ W-54 W-41R W-55 @ <1.0 A Based upon data collected January 2019 200 W-33 <1.0 @

A W-37 A W-56 A <1.0 WL1 * : Monitoring well W-39 is screened within the upper A

W-68 <1.0 @ W-57 A

A @

A W-RW2 and lower surficial aquifer W-58 @ <1.0 A

q

<1.0 @

A @ W-38 A

W-29 @

A 3.2 W-46 W-59 1.6 A SAN 1.7 @ <1.0 5 W-42 A NL @

A W-63 <1.0 W-30 W-28 A W-49 W-18R @

A A

A W-17 <1.0 <1.0 A 2.2 SL A EL W-6 W-22 W-10 @

A A

@ W-48 W-26 <1.0 W-7A <1.0 A @

A @

A 1.7

<1.0 A

W-32 5 W-11 @

A A 1.3 W-15 W-23R W-64 W-13R 8.4 @

A <1.0 1.8 @

A @ 46 A

A W-47 A W-14A Upper @ W-16 A 6.4 A 9.9 Sunset Lake 10 0 W-67 Pond W-27 @

A 38 0 150 300

<1.0 Feet A W-4 W-3A A 1:3,600

@ <1.0

@A Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 w

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of PCE in Upper Surficial Aquifer January 2019 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ W-20 A HOPKINS, SOUTH CAROLINA FIGURE 12 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F12 PCE_UpperSurf_Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location W-19B  ? Ditch 120 A Culvert W-36 100 5 PCE Isoconcentration Contours (µg/L) 5 @

A 210 PCE Concentration in µg/L EL East Lagoon W-43 W-60 NL North Lagoon A

< 5.0 SL South Lagoon A

SAN Sanitary Lagoon W-61 W-65 Plan W-35 Build t 210 WL2 ing WL1 West Lagoon 1 A

W-45 W-44 5 W-39*

A @

A WL2 West Lagoon 2 300 W-66 @ W-40 A @

A

< 1.0 @

A A @

A W-50 @ W-51 A

W-62 W-52 A 48 @

Note:

0 @ W-53 10 A W-33 A 190 W-54 Based upon data collected from October-December, 2018 W-41R A

W-68 RW-2R @ W-37 A

A W-55 A 130

• : Monitoring well W-39 is screened within the upper A 190 WL1

@ W-56 A

A @

A W-57 and lower surficial aquifer A

100 q

W-58 A

@@ W-38 A

W-46 A

5 W-29 10 0 SAN W-59 W-28 W-63 @

A

< 5.0 @

A W-17 W-42 NL @

A A < 1.0 @ W-30 A

A A @

A W-18R W-49 SL W-48 5 @

A EL 150 W-10 W-7A @

A A

W-6 W-22 A W-26 @

A @

A < 5.0 A

W-11

< 5.0 W-32 A

A W-23R W-64 W-15 W-13R A @

A A W-16 @

A W-14 A

Upper W-47 @

A @

A Sunset Lake 3.1 Pond W-67 A 0 150 300 W-27 Feet A W-3A W-4 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of PCE in Lower Surficial Aquifer October - December 2018 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 13 PROJECT NO. PREPARED BY: DATE:

60585917 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F13 PCE_LowerSurf_Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location

? Ditch W-19B Culvert

@ 92 A

5 W-36 PCE Isoconcentration Contours (µg/L) 5 @

A 230 PCE Concentration in µg/L EL East Lagoon W-43 W-60 @

A NL North Lagoon

<1.0 W-61 SL South Lagoon A

Plan SAN Sanitary Lagoon W-35 Build t WL2 W-65 ing 230 WL1 West Lagoon 1 5 W-40 A W-45 A @

A West Lagoon 2 W-66 WL2 A

A RW-1 @

A W-39 W-44 W-50

@ <1.0 A @

A 190 @ W-51 W-52 A 0

10 A

W-62 @ W-53 Note:

@ 51 A A W-33 W-54 Based upon data collected from January 2019 W-41R A

@ 140 A WL1 W-55 A@@ W-37 A * : Monitoring well W-39 is screened within the upper W-68 A

W-RW2 @ W-56 A

@ 150 A @ 150 A W-57 and lower surficial aquifer A

W-38 q

W-58 10 A@

A 5 0 W-46 SAN W-29 A W-59 A W-28 A 10 W-63 0 NL W-30 @

A

@ 1.4 A W-42 @

A W-17 A

A @ 1.7 A W-18R S W-49 L A W-22 EL W-10 W-7A W-6 A A

W-48 10

@ 180 A W-26 @

A @

A A

W-11 2.0 W-32 A

A W-23R W-15 W-13R W-64 A W-16 W-14A A

A A @

A Upper W-47 @

A @

A 2.4 Sunset Lake Pond W-67 A 0 150 300 W-27 W-4 Feet A W-3A 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of PCE in Lower Surficial Aquifer January 2019 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 14 PROJECT NO. PREPARED BY: DATE:

60585917 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F14 PCE_LowerSurf_Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location

? Ditch W-19B Culvert A W-36

< 5.0 TCE Isoconcentration Contours (µg/L)

A 5.3 TCE Concentration in µg/L W-43 EL East Lagoon

< 5.0 NL North Lagoon W-60 @

A W-61 SL South Lagoon A

< 5.0 W-35 SAN Sanitary Lagoon Plan

< 5.0 Build t W-65 WL2 W-40 @

A ing WL1 West Lagoon 1 A < 5.0 W-39* W-66 @

A WL2 West Lagoon 2 W-44 < 5.0 < 5.0 W-51 A @

A A@ W-45

< 5.0 < 5.0 A @

A W-50 @

A W-53 W-62 < 5.0 A @ W-52

@ < 5.0 Note:

W-54 A A 5 < 5.0 W-41R W-33 W-55 @ W-37 A Based upon data collected from October-December, 2018 23 A < 5.0 @

A@ < 1.0 A

W-68 WL1 * : Monitoring well W-39 is screened within the upper A W-57 A W-56 RW-2R @

< 5.0

@ W-38 < 5.0 A @

A and lower surficial aquifer A

W-58 q

< 5.0 A @@ 11

@ 5 W-46 A W-29 A

< 5.0 < 1.0 W-59 SAN A

W-63 W-42 @

A < 5.0 W-49 < 5.0 NL @ W-28 A

A W-17 W-18R @ W-30 A < 1.0

< 1.0 A

A @

A < 1.0 S L A EL W-10 W-7A W-6 W-48 < 1.0 @

A A W-22 W-26 < 1.0

< 1.0 A < 1.0 @

A @

A A

W-32 W-11 < 1.0 W-64 W-15 @

A

@ W-23R A W-13R < 1.0

< 1.0 2.0 W-16 3.1 W-14 A @

A A 2.9 @

A 5.3 A

Upper W-47 @

A @

A W-67 Sunset Lake Pond 8.4 W-27 5 @

A 0 150 300

< 5.0 W-4 Feet A W-3A NS 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of TCE in Upper Surficial W-20 Aquifer October - December 2018

< 5.0 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 15 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F15 TCE_UpperSurf_Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location

? Ditch A W-19B Culvert W-36 TCE Isoconcentration Contours (µg/L)

@ <1.0 A

8.1 TCE Concentration in µg/L EL East Lagoon W-43 NL North Lagoon

@ <1.0 A

W-60 SL South Lagoon A W-61

<1.0 Plan SAN Sanitary Lagoon W-40 W-35 Build t WL2 W-65 <1.0 <1.0 W-45 ing W-66 WL1 West Lagoon 1 A

11 @

A <1.0 RW-1 A

@ WL2 West Lagoon 2 W-50 @

A A @ W-51 A

W-39 <1.0 W-44 @ 3.5 A W-52 A @

A <1.0 A W-53 W-54 <1.0 Note:

W-62 @

A A 5 <1.0 W-55 @ W-37 A Based upon data collected from January 2019 W-41R @

A W-33 <1.0 @

A@ <1.0 A

W-56 WL1 * : Monitoring well W-39 is screened within the upper

@ 6.9 A

W-68 W-RW2 W-57 @ <1.0 A

A @

A <1.0 A and lower surficial aquifer

@ W-38 W-58 5

<1.0 @

A@ 9.5 A

W-29 A W-59 q

SAN W-46 <1.0 A

@ <1.0

@ <1.0 A NL W-28

@ <1.0 A

W-63 @

A W-49 A W-42 @ W-30 A

@ <1.0 A W-17 <1.0 A W-18R SL

<1.0 A

@ EL W-6 @

A A W-22 W-48 W-10 W-7A <1.0 A @ <1.0 A @ <1.0 A

W-26

@ <1.0 A

W-32 W-11 @ <1.0 A

A W-15 W-23R W-64 @ 1.6 A W-13R @ <1.0 A

<1.0 @

A W-47 @ 3.7 A W-14A A W-16 Upper @ 1.7 A @ 2.1 A

Sunset Lake 5 Pond W-67

@ 8.1 A 0 150 300 W-27 Feet

@ <1.0 A W-4 1:3,600

@A A @ <1.0 W-3A Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 w

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of TCE in Upper Surficial Aquifer January 2019 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ W-20 A HOPKINS, SOUTH CAROLINA FIGURE 16 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F16 TCE_UpperSurf_Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location W-19B  ? Ditch

< 5.0 A Culvert W-36 TCE Isoconcentration Contours (µg/L)

A 93 TCE Concentration in µg/L EL East Lagoon W-43 W-60

< 5.0 @

A NL North Lagoon A SL South Lagoon W-65 Plan W-61 Sanitary Lagoon W-35 SAN RW-1 Build t 93 WL2 ing A NS WL1 West Lagoon 1

@ W-40 5 A W-39* W-66 A @

A W-44

< 1.0 <5.0 A A @ W-45 WL2 West Lagoon 2 A W-50 @ W-51 A NS Not Sampled W-62 @

A W-52 A 1.9 @

A W-33 @ W-53 A Note:

17 W-54 A

W-68 W-41R @ W-37 Based upon data collected from October-December, 2018 RW-2R @

A W-55 A

@ A 2.7 7.0 10 A WL1

@ W-56 A * : Monitoring well W-39 is screened within the upper A @

A W-57 A and lower surficial aquifer W-58 A

@@ W-38 A

W-46 A

W-29 q

W-63 SAN A W-59 W-28

< 5.0 @

A W-17 W-42 NL @

A A < 1.0 @ W-30 A

A A @

A W-18R W-49 5 SL W-48 A EL 4.9 W-10 W-7A @

A A

W-6 W-22 A W-26 @

A @

A < 5.0 A

W-11

< 5.0 W-32 A

A W-64 W-15 W-23R W-47 W-13R A @

A

< 1.0 A

@ W-16 @

A W-14 A

Upper @

A @

A Sunset Lake Pond W-67 A 0 150 300 W-27 Feet A W-3A W-4 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of TCE in Lower Surficial Aquifer October - December 2018 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 17 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F17 TCE_LowerSurf_Nov2018.mxd

?  ?  ?

? Legend

? @

A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location

? Ditch W-19B Culvert

@ 1.9 A  ?

? W-36 TCE Isoconcentration Contours (µg/L)

A

?  ? 94 TCE Concentration in µg/L

?

W-43 EL East Lagoon A North Lagoon W-61 NL W-60

<1.0 @

A SL South Lagoon W-65 Plan 94 W-35 Build t SAN Sanitary Lagoon WL2 RW-1 ing W-66 @

A NS A W-40 WL1 West Lagoon 1 W-39

? @

A 3.5 @

A @

A W-45 WL2 West Lagoon 2 A

W-44 10 W-50

@ <1.0 A @

A @ W-51 W-52 A NS Not Sampled 5 W-53 A

W-62 @

@ 1.9 A A  ?

W-33 W-54 W-41R A

@ 18 Note:

? A W-55 A@@ W-37 A

A WL1 W-68  ? Based upon data collected from January 2019 W-RW2 @ W-56 A

@ 2.5 A @ 12 A W-57 A  ?  ? * : Monitoring well W-39 is screened within the upper W-38

?  ? W-58 AA@ and lower surficial aquifer

? W-46 W-29 A W-59 q

SAN A W-28 A

W-63 NL W-30 @

A

@ <1.0 A W-42 @

A  ?

W-17 A

A @ <1.0 A W-18R W-49 SL

? @

A W-22 EL W-7A W-6 @

A A

W-48 W-10 1.8  ?

@ 5.1 A W-26 @

A @

A  ?

A W-11

<1.0 W-32 A

A W-23R W-15 W-13R W-64 A W-16 W-14A A

A A W-47 @

A Upper <1.0 @

A @

A Sunset Lake Pond W-67 A 0 150 300 W-27 W-4 Feet A W-3A

@A

? 1:3,600 A

? Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet w  ? Datum: North American 1983 Lo ke  ?

La  ?

et ns Su  ? 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of TCE in Lower Surficial Aquifer January 2019 W-20

? WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 18 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F18 TCE_LowerSurf_Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location W-19B  ? Ditch 4.3 Culvert A W-36 0.27 Nitrate Isoconcentration Contours (mg/L)

A 7.8 Nitrate Concentration in µg/L W-43 EL East Lagoon 7.15 North Lagoon W-60 NL A

<0.286 SL South Lagoon W-61 A 10 W-35 SAN Sanitary Lagoon 0.051 W-65 Plan 5.5 Build t WL2 0.39 RW-1 W-40 ing WL1 West Lagoon 1 A NS A 4.6 W-44 W-39* @

A WL2 West Lagoon 2 W-66 @

A @ W-45 3.5 120 @

A W-51 A 18 0.95 0.03 NS Not Sampled W-62 @

A @

A W-50 @

A NS W-53 A W-52 3.6 @ 2.3 0.67 A W-33 @

A W-54 Note:

W-41R 10 W-55 @

A 2.9 W-68 55 W-37 RW-2R @

A 3.3 A@@

A Based upon data collected from October-December, 2018 3.4 @

A 14 WL1 W-56 2.8 W-57 A @ 6.5

• : Monitoring well W-39 is screened within the upper A @

A 6.6 W-58 @

A 16 and lower surficial aquifer A @

A W-38 q

W-46 7.6 SAN W-29 @ W-59 5.6 A

W-63 7.3 @

A 21 0.86 W-49 W-42 @

A W-28 W-17

<0.02 4 NL 4.5 A 7.8 A W-18R @

W-30A A

A 710 A SL 47 W-48 A EL W-10 W-7A 5.3 21 370 @

A A

W-26 W-6 W-22 A 3.5 @

A @

A 14 71 A

100 W-11 W-32 57 240 W-64 W-15 @

A

@ W-23R A W-13R 0.81 49 44 W-16 24 W-14 @

A 10 A 4.6 @

A 3.3 A

A Upper W-47 @

A @

A 84 W-67 Sunset Lake Pond 17 W-27 @

A 0 150 300 0.039 W-3A W-4 Feet A <0.20 DRY 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Nitrate in Groundwater W-20 October - December 2018

<0.20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 19 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F19 Nitrate_Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well

? Ditch W-19B Culvert

@ 3.8 A

W-36 Nitrate Isoconcentration Contours (mg/L)

@ 0.055 A

7.2 Nitrate Concentration in µg/L EL East Lagoon W-60 W-43 0.020 @ 9.0 A NL North Lagoon A W-61 SL South Lagoon W-65 W-40 W-35 0.48 4.2 RW-1 Plan 0.40 2.6 Build t SAN Sanitary Lagoon WL2 NS ing W-66 @

A W-45 WL1 West Lagoon 1 2.0 @

A @

A 0.74 A

A @ W-51 A WL2 West Lagoon 2 W-44 W-39 W-50

@ 2.9 A @ 96 A <0.020 W-53A@ 0.023 NS Not Sampled

@ W-52 0.063 A 2.4 W-62 W-54 @

@ 3.9 A A 3.0 W-37 Note:

W-33 @ 3.6 W-55 A 10 @ W-56 W-41R @

A 3.5 @

AA Based upon data collected from January 2019

@ 44 A WL1 W-57 A 4.1 W-68 W-RW2 @ * : Monitoring well W-39 is screened within the upper

@ 3.3 A @ 14 A 5.7 W-58

@ W-38 A and lower surficial aquifer 11 @

A @ 5.0 A

SAN 10 W-29 A@ W-59 W-46 6.4 @

A 21 W-28 q

@ 7.6 A W-30 W-63 NL @ 7.2 A

0.16 A

@ W-49 W-42 W-17

@ 45 A

<0.020 A

@ 3.6 A

12 A

@ SL W-18R 100 750 A EL W-6 W-22 150 @

A A

W-48 W-7A 59

@ 5.0 A W-10

@ 15 A @ 350 A

W-26

@ 3.3 A

W-32 W-11

@64 210A A

W-23R W-15 W-13R W-64 @ 1.2 10 W-47 @

A A 49 @ 21 A

61 A

@ 71 A W-16 W-14A Upper @ 3.0 A @ 0.50 A

Sunset Lake Pond W-67

@ 17 A 0 150 300 W-27 Feet 0.029 @

A W-4 W-3A A @ 8.4

@A 1:3,600

<0.020 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 w

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Nitrate in Groundwater January 2019 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ 0.035 A HOPKINS, SOUTH CAROLINA FIGURE 20 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F20 Nitrate_Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location W-19B  ? Ditch 0.016 Culvert A W-36 0.005 Fluoride Isoconcentration Contours (mg/L)

A 1.19 Fluoride Concentration in µg/L W-43 0.02 EL East Lagoon W-60 0.11 @

A NL North Lagoon A SL South Lagoon W-61 W-35 W-65 Plan 0.026 RW-1 Build t SAN Sanitary Lagoon 0.086 WL2 3.08 W-40 A NS ing 0.124 WL1 West Lagoon 1 W-39 A

W-44 W-66 @

A 0.019 0.099 1.19 @ W-45 A @

A A W-51 WL2 West Lagoon 2 0.861 0.304 W-62 @

A @

A W-50 @

A NS Not Sampled 0.02 NS W-53 A

@ W-52 0.262 A W-33 @ 0.957W-54 A

W-41R 0.187 W-55 A @ 0.264 W-68 0.041 0.06 A Note:

RW-2R @

A A@@ W-37 0.047 @

A 0.098 WL1 0.03 W-57 A @ W-56 Based upon data collected from October-December, 2018 A @

A 0.068 0.135 A * : Monitoring well W-39 is screened within the upper W-58 W-38 W-46 4 W-29 0.117 A A@ 0.127 A and lower surficial aquifer 0.033 9.69 A q

W-63 SAN

@ W-59 0.474 W-49 W-42 @

A 1.08 W-17 0.011 1.49 NL @

A A 4.02 W-18R @

A W-28 A 4.63 SL W-30 A @

A 4.8 8.94 W-48 A EL W-10 W-7A 0.529 3.46 6.86 @

A A

W-26 W-6 W-22 A 1.63 @

A @

A 0.058 4.59 A

W-11 W-32 0.01 3.61 W-64 W-15 @

A

@ W-23R A W-13R 0.139 3.26 1.86 W-16 8.79 W-14 A @

A A 8.62 @

A 0.025 A 4 Upper W-47 @

A @

A 4

Sunset Lake W-67 Pond 0.063 W-27 @

A 0 150 300 4.65 W-3A W-4 Feet A 0.067 DRY 1:3,600

@A A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Fluoride in Groundwater W-20 October - December 2018 0.048 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY A HOPKINS, SOUTH CAROLINA FIGURE 21 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F21 Flouride_Nov2018.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location

? Ditch W-19B Culvert

@ 0.024 A

W-36 Fluoride Isoconcentration Contours (mg/L)

@ 0.005 A

1.19 Fluoride Concentration in µg/L EL East Lagoon W-43 NL North Lagoon

@ 0.008 A

W-60 SL South Lagoon W-61 @

A 0.007 0.075 W-35 Sanitary Lagoon W-65 Plan SAN WL2 1.48 0.007 Build t

@ RW-1 ing W-45 WL1 West Lagoon 1 A

W-66 @

A @ 0.614 0.162 A WL2 West Lagoon 2 A W-51 W-40 @

A @

A W-44 W-39 0.258 0.164 NS Not Sampled

@ 0.046 A @ 0.009 A W-53 @

A W-52 W-50 0.069 A @ 1.08 W-62 0.006 W-54

@ 0.01 A @ W-37 A

0.153 Note:

W-33 @

A 0.012 0.193 W-55 W-41R 0.065 A @ W-56 A

A @ Based upon data collected from January 2019

@ 0.056 WL1

@ 0.152 W-68 A W-57 A W-RW2 * : Monitoring well W-39 is screened within the upper

@ 0.009 A @ 0.104 A 0.0 A W-38 W-58 0.104 and lower surficial aquifer 0.1 @

A@

A A W-59 W-29 1.08 q

SAN W-46 7.94 A

@ 0.015 A W-30 W-28 W-63 NL 9.06 @ 5.16 A

4 0.502 A

@ W-49 W-42 @

A W-17 0.003 A

@ 1.51 A

2.44 A

@ W-18R SL 5.56 A

@ EL W-6 @ W-22 A

A W-48 W-10 W-7A 0.136 5.16

@ 0.341 A @ 3.42 A @ 6.6 A

W-26

@ 1.59 A

W-32 W-11 4 @0.018 3.26A A

W-23R W-15 W-13R W-64 W-47 @ 2.26 A @ 0.011 A

4.32 A

@ @ 8.29 A W-14A

@ 4.23 A W-16 Upper @ 7.61 A @ 0.066 A

Sunset Lake Pond W-67

@ 0.008 A 0 150 300 W-27 Feet

@ 4.33 A

W-4 W-3A A 1:3,600

@ 4.56

@A 0.038 Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 w

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Fluoride in Groundwater January 2019 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ 0.049 A HOPKINS, SOUTH CAROLINA FIGURE 22 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F22 Flouride_Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location

? Ditch W-19B

@ <0.067 A Culvert W-36 Shoreline

@ <0.067 A

Uranium - t oMCLof30pCi /

L (October-November2018)

W-43 30 Uranium Concentration in pCi/L W-60 @ <0.067 A

<0.067 East Lagoon W-35 EL W-61 A

W-40 <0.067

<0.067 W-65

<0.067 Plan NL North Lagoon WL2 <0.067 Build t W-45

@RW-1 ing W-66 A SL South Lagoon

@ 2.58

<0.067 A @

A SAN Sanitary Lagoon A

A@ @ W-51 A

W-44 W-39 W-50 W-52 <0.067 West Lagoon 1 Not Sampled

@ <0.067 A WL1

@ <0.067 A <0.067 A@

W-53 W-54

@ 0.0784 A WL2 West Lagoon 2 W-62

@ 0.0843 A <0.067 @

A W-37 W-33 W-55 187 A@ <0.067

@ <0.067 Note:

W-41R A WL1 A@@

A W-56 W-68

@ <0.067 A 158 W-RW2 Based upon data collected from October-December, 2018

@ 0.0802 A @ <0.067 A 30 A

@ W-57 W-58 A 0.610 * : Monitoring well W-39 is screened within the upper W-38 0.798 @

A@ 0.196 A and lower surficial aquifer W-29 @

A W-59 W-46 SAN

@ 30 2.28 A 31.1

@ <0.067 W-28 q

W-63 A NL @ 0.541

@ W-30 1.02 A

A W-42 W-18R A

@ <0.067 A

A W-17 12.7 W-49 0.157 A

@ 4.47 SL Not Sampled @

A EL W-6 @

A W-22 0.420 A

W-48 W-7A 0.711

@ 0.0922 A W-10

@ 0.0841 A @ 0.691 A

W-26

@ 0.0947 A

W-32 W-11

@<0.067 0.223A A

W-23R W-64 @W-15 W-13R @ <0.067 A

W-47 A @ 0.131 A

0.140 A

@ 0.0797 A <0.067 W-16 W-14A Upper @ <0.067 A @ <0.067 A

Sunset Lake Pond W-67

@ <0.067 A 0 150 300 W-27 Feet

<0.067 A W-3A @ W-4 1:3,600

@A A Dry - Not

<0.067 Map Projection: NAD 1983, South Carolina State Plane, Sampled FIPS 3900, Feet Datum: North American 1983 w

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Uranium in Groundwater November 2018 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ <0.067 A HOPKINS, SOUTH CAROLINA FIGURE 23 PROJECT NO. PREPARED BY: DATE:

60585917 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F23 Uranium_Nov2018.mxd

?  ?  ?

Legend

?

? @

A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location

? Ditch W-19B

@ <0.067 A  ? Culvert

?

W-36 Shoreline

@ <0.067 A

?  ? Urani um - t oMCLof30pCi

/L

? (J anuary2019)

W-43 30 Uranium Concentration in pCi/L W-60

@ <0.067 A

<0.067 EL East Lagoon W-61 @

A W-65

<0.067 <0.067 W-35 Plan NL North Lagoon WL2 <0.067 Build t W-66 @ RW-1 A W-45 ing SL South Lagoon

<0.067 @

A  ? 1.05 A

W-40 SAN Sanitary Lagoon A

A @

A W-51 W-44 W-39 E0.142 <0.067

@ <0.067 A W-50 W-53 WL1 West Lagoon 1

@ <0.067 A E0.0876 A W-52

<0.067@

A <0.067 WL2 West Lagoon 2 W-62

@ E0.0831 A @

A W-54 W-33 <0.067  ?

A

@ <0.067 30A Note:

? W-41R A @@

A W-37

@ <0.067 A WL1 W-55 <0.067 W-56 W-68  ? W-RW2 @

A Based upon data collected from January 2019 178 132

@ <0.067 A @ E0.079 A W-57 A

W-38 0.247 W-58

?  ? * : Monitoring well W-39 is screened within the upper

?  ?

1.55 @

A@ E0.197 A and lower surficial aquifer

? SAN W-29 @ W-59 A

W-46 2.21 A

@ 29.2

@ <0.067 W-28 q

A W-63 NL @ 0.456 A

0.891 A

@ W-49 W-42 W-17

@ W-30 A  ?

E0.0731 A

@ <0.067 A 22.9 E0.0939 A

@ SL

? W-18R A@ EL 5.09 W-22 W-6 @

A A

W-48 0.200 0.710

@ <0.067 A W-10 W-7A

?

@ E0.0854 A @

A  ?

W-26 0.719

@ <0.067 A

W-11 A W-32 W-15

@ 0.296 A

E0.192

<0.067 W-23R W-64 @

A W-13R @ <0.067 A

<0.067 @

A W-47

@ E0.149 A

A W-16 W-14A Upper <0.067 @ E0.113 A @ E0.104 A

Sunset Lake Pond W-67

@ <0.067 A 0 150 300 W-27 Feet

<0.067 A

@ W-3A W-4  ? 1:3,600

<0.067 @

@A A E0.143

? Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet w  ? Datum: North American 1983 Lo ke  ?

La  ?

et ns Su  ? 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Uranium in Groundwater January 2019

? W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ <0.067 A HOPKINS, SOUTH CAROLINA FIGURE 24 PROJECT NO. PREPARED BY: DATE:

60585917 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F24 Uranium_Jan2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location A Floodplain Aquifer Monitoring Well Location W-19B

@ <45.7 A  ? Ditch W-36 Culvert

@ <39.5 A

Technetium-99 Isoconcentration Contours (pCi/L) 861 Technetium-99 Concentration in pCi/L W-43

@ <38.5 A

W-60 EL East Lagoon

<37.6 W-35 W-61 @

A <39.0 NL North Lagoon

<38.0 RW-1 Plan W-65 W-40 Build t NA WL2 SL South Lagoon

<37.6 <36.4 W-45 ing A <39.2 SAN Sanitary Lagoon W-66 @

A @

A

<38.4 @

A A W-52

@ W-51 A WL1 West Lagoon 1 W-50 <43.5

@ W-44 A @ W-39 A NS

<42.3

@ W-53 A

NA NA WL2 West Lagoon 2 W-54 @ <41.0 A

W-62 <41.9 A@ W-37 NA Not Analyzed

@ <42.2 A W-33 NA W-55 @

A NA A <40.9 @

A W-56 A Note:

W-41R @

A WL1 W-57 <42.4 W-68 @

@ <37.4 A NA @ W-RW2 A <43.5 A Based upon data collected from October-December, 2019 NA W-58 @

A

<41.1 A W-38 * : Monitoring well W-39 is screened within the upper A NA

@ W-59 A and lower surficial aquifer W-29 SAN W-46 @

A <41.4 W-63 @ 49.7 A NA

@ W-28 q

NL A

<40.6 W-42 @ W-30 NA A W-17 W-18R A

@ <40.6 A

A 208 NA W-49 348 A

@ SL

<41.6 @

A EL W-6 @

A A

W-10 W-7A 861 W-22 A @ 90.0 A @ 175 A NA W-48 NA @ W-26 A W-11 NA 3570 A

A W-32 259 W-64 W-13R @ W-23R A

74.7 W-47 @

A W-15 @ 149 A NA A

A 113 265 @ W-16 @ W-14A A

A NA NA Upper Sunset Lake Pond W-67

@ 82.9 A 0 150 300 W-27 Feet

<40.0 A

@ W-3A W-4 1:3,600

<44.3 @

@A A

Dry - NS Map Projection: NAD 1983, South Carolina State Plane, FIPS 3900, Feet Datum: North American 1983 w

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Technetium 99 in Groundwater October - December 2018 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ Not A HOPKINS, SOUTH CAROLINA Analyzed FIGURE 25 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F25 Tech99_Nov2019.mxd

Legend A Black Mingo Monitoring Well Location A Lower Surficial Monitoring Well Location A Upper Surficial Monitoring Well Location W-19B @

A Floodplain Aquifer Monitoring Well Location

@ <39.8 A

? Ditch W-36

@ <42.2 A Culvert Technetium-99 Isoconcentration Contours (pCi/L)

W-43 2370 Technetium-99 Concentration in pCi/L W-60 @ <41.4 A

<37.2 EL East Lagoon W-61 A W-35

<42.8 <40.2 NL North Lagoon W-40 Plan W-65 RW-1 Build t WL2 <48.4

<39.3 NA ing SL South Lagoon A W-45 W-66 @

A @

A <43.5 SAN Sanitary Lagoon

<44.7 @

A @ W-51 A

A W-44 W-39 W-50 WL1 West Lagoon 1

@ <42.1 A @ <42.7 A <39.9 W-53 @ <43.5 A

<39.7

@ W-52 A WL2 West Lagoon 2 W-54 W-62

@ <36.8 A <37.2 @ <42.2 A NA Not Analyzed W-33 W-55 @ W-37 A

W-41R @

A <29.4

<39.0 @

A @ <43.6 A

@ <41.1 A WL1 W-56 W-68 W-RW2 W-57 A @ <41.4 Note:

@ <45.0 A @ <40.0 A <39.7 A@ W-38 W-58 Based upon data collected from January 2019

<42.2 A @

A@ <42.4 W-29 @ W-59 A * : Monitoring well W-39 is screened within the upper

<37.8 SAN W-46 <29.8 A@

@ <41.4 W-28 A and lower surficial aquifer W-63 NL W-30 @ <30.9 A

<35.5 A

@ W-49 W-42 @

A W-17 W-18R <33.8 q

<41.8 A

@ <41.4 A

476 A

@ 168 SL A EL W-6 W-22 W-7A 2370 @

A A <28.8 W-48 W-10

@ <39.7 A 80.9 A

@ 160 @

A W-26 0

90

@ <34.7 A 90 W-32 0 W-11 307 4200 @

A A

W-23R W-64 W-47 @ W-15 A 233 W-13R @ <30.2 A

118 @

A @ 111 A W-14A A 97.8 W-16 Upper @ <30.5 A @ <31.0 A

Sunset Lake Pond W-67

@ 114 A 0 150 300 W-27 Feet

<35.5 A W-3A A W-4 1:3,600

<29.4

@@ <45.4 A

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

Lo ke La et ns Su 101 Research Drive er Columbia, SC 29203 T: (803) 254-4400 F: (803) 771-6676 Extent of Technetium 99 in Groundwater January 2019 W-20 WESTINGHOUSE COLUMBIA FUEL FABRICATION FACILITY

@ <32.2 A HOPKINS, SOUTH CAROLINA FIGURE 26 PROJECT NO. PREPARED BY: DATE:

60595649 CCS August 2019 Path: M:\EnvDataViz\Westinghouse\mxd\GW_Report 2018-2019\F26 Tech99_Jan2019.mxd