WESTERN BOUNDARY STUDY AREA

OPERABLE UNIT 1 GROUNDWATER (AAWB01)

2023 ANNUAL REPORT

ABERDEEN PROVING GROUND, MARYLAND

April 2025

Contract No.: W56ZTN-17-D-0009 Delivery Order No.: W56ZTN-21-F-0068

Prepared by:

DISTRIBUTI ON

DISTRIBUTION RESTRICTION STATEMENT APPROVED FOR PUBLIC RELEASE:

DISTRIBUTION RESTRICTION STATEMENT APPROVED FOR PUBLIC RELEASE:

DISTRIBUTION IS UNLIMITED # 241210-02

RENOVA-SOVEREIGN JOINT VENTURE

3417 Sunset Avenue Ocean Township, New Jersey 07712

Western Boundary Study Area Operable Unit 1 Groundwater (AAWB01) 2023 Annual Report Aberdeen Proving Ground, Maryland

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TABLE OF CONTENTS

1.0 INTRODUCTION.......................................................................................................... 1-1

1.1 Purpose and Scope ............................................................................................... 1-1

1.2 Site Description and Background ........................................................................ 1-2

2.0 REMEDIAL ACTION OPERATIONS AND MAINTENANCE .............................. 2-1

2.1 Sampling and Monitoring .................................................................................... 2-1

2.2 Operations and Maintenance................................................................................ 2-2

3.0 PERRYMAN GROUNDWATER PRETREATMENT FACILITY SAMPLING

RESULTS ....................................................................................................................... 3-1

4.0 HARFORD COUNTY PRODUCTION WELL SAMPLING RESULTS ................ 4-1

5.0 LONG-TERM MONITORING/MANAGEMENT..................................................... 5-1

6.0 SUMMARY .................................................................................................................... 6-1

7.0 REFERENCES ............................................................................................................... 7-1

FIGURES

Figure 1 Western Boundary Study Area (WBSA) Operable Unit 1 (OU1) Figure 2 Western Boundary Study Area Operable Unit 1 (AAWB01) Sampling Locations

TABLES

Table 1 Detected VOCs in Harford County Perryman Groundwater Pretreatment Facility

Samples 2023 Table 2 Compounds and Substances Detected in Harford County Production Well Samples

2022 and 2023 Table 3 2023 Operations & Maintenance (O&M) Activities

APPENDICES

Appendix A Laboratory Reports and SOP ii

ACRONYMS AND ABBREVIATONS

6:2 FTS 6:2 Fluorotelomer Sulfonic Acid

AEL Advanced Environmental Laboratories

6:2 Fluorotelomer Sulfonic Acid

Advanced Environmental Laboratories

APG Aberdeen Proving Ground CERCLA Comprehensive Environmental Response, Compensation, and Liability Act DPW-ED Directorate of Public Works-Environmental Division ECC Environmental Chemical Corporation FTA Fire Training Area FYR Five-Year Review HCP Harford County Production IRP Installation Restoration Program LTM Long-Term Monitoring/Management MCL Maximum Contaminant Level μg/L Micrograms per Liter ng/L Nanograms per Liter O&M Operations and Maintenance OU1 Operable Unit 1 PFAS Per- & Polyfluorinated Substances PFBA Perfluorobutanoic Acid PFBS Perfluorobutanesulfonic Acid PFHpA Perfluoroheptanoic acid PFHpS Perfluoroheptanesulfonic acid PFHxA Perfluorohexanoic Acid PFHxS Perfluorohexanesulfonic Acid PFNA Perfluorononanoic Acid PFOA Perfluorooctanoic Acid PFOS Perfluorooctanesulfonic Acid PFPeA Perfluoropentanoic Acid PFPeS Perfluoropentanesulfonic acid QA Quality Assurance QC Quality Control QSM Quality Systems Manual RAO Remedial Actions Operations ROD Record of Decision RSJV Renova-Sovereign Joint Venture RSL Regional Screening Level TCE Trichloroethene TCL Target Compound List U.S. United States USEPA U.S. Environmental Protection Agency VOC Volatile Organic Compound

Aberdeen Proving Ground, Maryland iii

WBSA Western Boundary Study Area

Aberdeen Proving Ground, Maryland

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1.0 INTRODUCTION

The United States (U.S.) Army Garrison Aberdeen Proving Ground (APG), Directorate of Public Works Environmental Division (DPW-ED) has tasked Renova-Sovereign Joint Venture (RSJV) to conduct Remedial Action Operations (RAO) services at APG, Maryland under Contract Number W56ZTN-17-D-0009, Delivery Order Number W56ZTN-21-F-0068. The RSJV assumed control of the RAO in July 2021 and Environmental Chemical Corporation (ECC) oversees the maintenance and monitoring activities associated with Western Boundary Study Area (WBSA) Operable Unit 1 (OU1) Groundwater within the Aberdeen Area of APG. The Headquarters Army Environmental System/Army Environmental Database-Restoration identification for the WBSA OU1 Groundwater is 24015.1188/AAWB01. This annual report summarizes the RAO activities for WBSA OU1 Groundwater and presents the results for the performance monitoring period from January to December 2023.

The WBSA OU1 Groundwater performance monitoring activities and reporting have been part of the Environmental Remediation Services Long-Term Management Sites at APG. With the WBSA OU1 Groundwater incorporated under the APG RAO services, performance monitoring activities will now be included as a separate Annual Report. Maintenance and monitoring of the WBSA OU1 Groundwater are conducted in support of the APG Installation Restoration Program (IRP) and in accordance with the 1990 Federal Facilities Agreement at APG (U.S. Environmental Protection Agency [USEPA] Region III et. al, 1990) under Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) protocols.

1.1 Purpose and Scope

This report is intended to summarize and document the activities conducted by the RAO contractor during 2023 for performance monitoring activities in accordance with project requirements.

Monitoring requirements associated with the WBSA OU1 Groundwater 2000 Record of Decision (ROD) are defined in The Edgewood and Aberdeen Areas. Environmental Remediation Services:

Long-Term Management Sites at Aberdeen Proving Ground, Operations & Management and Long-Term Monitoring Plan, Revision 2 (HGS Engineering, Inc., 2016). Additional periodic monitoring for per- and polyfluoroalkyl substances (PFAS) has been completed by the Army based on recommendations from The Emerging Contaminants Study: Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) at WBSA OU1 (HGS Engineering, Inc., 2016). PFAS groundwater contaminants were identified in the groundwater post ROD and the Army has continued monitoring activities until the contamination is investigated under the CERCLA process. Section 2.0 presents a summary of the RAO activities performed. Section 3.0 discusses the Perryman Groundwater Pretreatment Facility sampling results. Section 4.0 describes the Harford County Production (HCP) Wells sampling results. Section 5.0 presents the Long-Term Monitoring/Management (LTM) summary. Section 6.0 provides an overall RAO activity summary. Finally, Section 7.0 includes references used in this report.

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1.2 Site Description and Background

The Western Boundary (Perryman) Study Area is located within the Aberdeen Area of APG (Figure 1). WBSA OU1 refers to groundwater under the southwestern two-thirds of the WBSA near the Perryman Well Field, along the Installation boundary of the Aberdeen Area of APG.

Previous military and industrial activities in the WBSA have contributed to groundwater contamination. Volatile organic compounds (VOCs) and PFAS contamination from the former Aberdeen Fire Training Area (FTA) was identified in the upper aquifer. A trichloroethene (TCE) plume in groundwater was reported to extend from the former FTA to HCP wells HCP-5 and HCP-

6. A ROD was issued in July 2000 and specified a fixed-bed granular activated carbon system at the Perryman Groundwater Pretreatment Facility (APG, 2000).

The groundwater monitoring plan was developed in December 2000 and revised in 2004 and 2008.

The 2008 revision required quarterly sampling of the treatment system and annual sampling of HCP wells and monitoring wells for Target Compound List (TCL) VOCs. In 2012 the monitoring well sampling frequency was changed to every five (5) years. Annual monitoring of explosives and 1,4-dioxane concentrations in the Facility’s influent was required for five (5) years until 2013.

Provided that no explosives and 1,4-dioxane were detected, the monitoring frequency was reduced to every five (5) years after 2013 (HGS Engineering, Inc., 2016). The Perryman Groundwater Pretreatment Facility is operated under an agreement between Harford County and the U.S. Army.

Harford County monitors water treatment plant operations on a regular basis and performs routine preventative maintenance. Environmental monitoring activities are shared between Harford County and the U.S. Army (APG, 2019).

An emerging contaminants study was conducted in 2012 and 2013 that focused on determining the presence of PFAS, such as PFOA and PFOS, in WBSA OU1 groundwater. The study determined that groundwater contained PFOA, PFOS, and other PFAS. The highest concentrations were observed in the vicinity of the former Aberdeen FTA (APG, 2019).

According to the Aberdeen Proving Ground, Aberdeen Area Fourth Five-Year Review Report (APG, 2019), the remedy is performing as designed and meets all remedial objectives. However, the protectiveness determination was deferred because PFAS has been detected in groundwater and the potential for future risk to human health has not been evaluated. The Five-Year Review noted that treated water had not been found to contain PFOA or PFOS above the then relevant USEPA lifetime health advisories. The Five-Year Review recommended that an evaluation be conducted to determine the effectiveness of existing production well systems for PFOS/PFOA groundwater plume containment and hydraulic control. This evaluation is ongoing under a separate contract (APG, 2019; EA Engineering, Science, and Technology, Inc. PBC, 2021

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2.0 REMEDIAL ACTION OPERATIONS AND MAINTENANCE

2.1 Sampling and Monitoring

During 2023 the RAO sampling activities included:

• Semi-annual sampling of the Perryman Groundwater Pretreatment Facility influent, effluent, and finished water for analysis of TCL VOCs.

• Five-year sampling of the Perryman Groundwater Pretreatment Facility influent for analysis of 1,4-dioxane and explosives.

• Annual sampling of the HCP wells for analysis of TCL VOCs and PFAS.

Harford County samples the plant and the two major production wells (i.e. HCP-5 and HCP 6) quarterly for PFAS as part of the Unregulated Contaminant Monitoring Regulation (UCMR) under CFR 141.40. The finish water is also sampled and analyzed by the county for 21 regulated VOCs.

Results of these sampling efforts are summarized in the 2023 Water Quality Report Public Water System Identification Number (PWSID) #012-0016 (Harford County Public Works, 2023).

Figure 2 shows the WBSA OU1 HCP wells and groundwater monitoring well sampling locations.

All chemical analyses and field quality control (QC) sampling were performed according to USEPA Analytical Level II data quality objectives. Quality Assurance (QA)/QC requirements for analyses were performed on all collected samples. Eurofins Lancaster Laboratories Environmental, LLC analyzed the Facility’s water, HCP wells, and QA/QC samples for VOCs by USEPA Method 524.2. Advanced Environmental Laboratories, Inc analyzed the HCP wells and QA/QC samples for PFAS by USEPA Method 533 and PFAS Compliant with Table B-15, Department of Defense (DoD), Quality Systems Manual (QSM), Version 5.3 Requirements, and analyzed the Facility’s water for 1,4-dioxane by USEPA Method SW-846 8270D SIM and explosives by USEPA Method 8330B.

Table 1 presents the VOCs detected in the Facility’s influent, effluent, and finished water samples for 2023. Table 2 presents the VOCs and PFAS detected in the HCP well samples for 2022 and 2023. Quality control blank results are also included in Table 2.

Appendix A includes all the laboratory reports for the sample results documented in this report, as well as the AEL PFAS SOP (USEPA Method 533 and PFAS Compliant with Table B-15, DoD, QSM, Version 5.3 Requirements).

Sampling of the 41 monitoring wells occurs every five (5) years during the site’s CERCLA Five- Year Review (FYR) for analysis of TCL VOCs and PFAS. Sampling was completed in 2012, 2017, and 2021. The next FYR sampling event is tentatively scheduled for 2026.

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2.2 Operations and Maintenance

Operations and Maintenance (O&M) activities completed during 2023 included carbon vessel changeouts and refurbishments. Table 3 presents the details of the O&M activities completed during the reporting period.

Table 3 2023 Operations & Maintenance (O&M) Activities

Date O&M Activity Vessel Number

Replacement Carbon

Total Weight1 (pounds)

02/09/2023 Carbon Vessel Changeouts 3 & 4 40,000

04/20/2023 Carbon Vessel Changeouts 2 & 5 40,000

05/31/2023 Carbon Vessel

Refurbishments and Changeouts

9, 10 & 11 60,000

11/14/2023 Carbon Vessel

Refurbishments and Changeouts

6, 7 & 8 60,000

12/28/2023 Carbon Vessel Changeout 1 20,000

Note:

1 Each carbon vessel was filled with 20,000 pounds of virgin carbon.

Aberdeen Proving Ground, Maryland

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3.0 PERRYMAN GROUNDWATER PRETREATMENT FACILITY SAMPLING

RESULTS

The Harford County Perryman Groundwater Pretreatment Facility consists of groundwater production wells and a pipeline system to transport extracted groundwater to the facility. The treatment plant employs metals removal and organic compound destruction and removal processes. Two semi-annual sampling events were conducted during calendar year 2023 to monitor contaminant concentrations in the Facility’s influent, effluent, and finished water. The finished water sample refers to the combined effluent after it passes through the granular activated carbon pretreatment system. Influent and effluent ports 1 are associated with carbon vessels 1-5 and influent and effluent ports 2 are associated with carbon vessels 6-11.

Samples of influent, effluent, and finished water were collected at the Facility on 31 January 2023 and 29 November 2023. The samples were analyzed for TCL VOCs. The influent was also analyzed for 1,4-dioxane and explosives in November 2023. Table 1 presents the VOCs detected in Facility’s influent, effluent, and finished water in 2023. Samples were not collected from the influent and effluent ports 2 during the January 2023 sampling event due to the carbon vessels being offline for refurbishments and changeouts.

Chloroform was detected in the finish water samples during both 2023 events. These detected chloroform concentrations are less than the USEPA tap water regional screening level (RSL) of

0.22 micrograms/Liter (µg/L). Chloroform was detected with a J qualifier in the effluent sample during November 2023 at 0.22 J µg/L. This detection was reported at the RSL of 0.22 µg/L.

Styrene was detected below the RSL (120 µg/L) in the effluent samples during both 2023 events (0.2 J µg/L and 0.25 J µg/L, respectively).

Consistent with previous years of plant sampling, the detected TCE concentration in the influent ranged from 0.91 µg/L to 1 µg/L during both 2023 events. The January and November 2023 influent samples contained estimated detections of chloroform.

None of the VOCs detected in the 2023 Facility’s influent, effluent, and finished water samples exceeded their respective Maximum Contaminant Levels (MCLs) for drinking water.

In accordance with the five (5) year sampling, influent was sampled during November 2023 for 1,4-dixoane and explosives. There were no detections reported.

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4.0 HARFORD COUNTY PRODUCTION WELL SAMPLING RESULTS

Five (5) HCP wells (HCP-02, -04, -05, -06, and -09) were sampled in November 2023. Figure 2 displays the locations of the HCP wells. Table 2 presents the compounds and substances detected in HCP well samples for 2023 and the previous annual sampling event in 2022. Groundwater samples were not collected from HCP-01 and -08 in 2023 as the wells were offline. HCP-01 was out of service due to a disabled pump and HCP-08 was offline due to the need for level sensor and pump motor repairs. HCP-03 well was decommissioned and there is not an HCP-07 well designation.

The five (5) production wells were sampled on 29 November 2023 for TCL VOCs and PFAS analysis. All the laboratory reports are included in Appendix A.

During 2023, VOCs were not detected above the MCLs in the five (5) HCP wells sampled and VOCs were not detected in HCP-09. Below is a summary of the 2023 VOC results:

• Primary contaminant TCE was detected in HCP-05 (1.4 µg/L) and HCP-06 (1.2 µg/L) above the RSL of 0.28 µg/L, but below the MCL of 5 µg/L. None of the other three (3) production wells contained detectable TCE concentrations.

• HCP-06 contained detected concentrations of 1,1-dichloroethene at 0.15 J µg/L, cis-1,2-dichloroethene at 0.19 J µg/L, and tetrachloroethene at 0.13 J µg/L. All three VOCs were below their respective RSLs.

• Chloroform was detected in HCP-02 at 0.29 J µg/L and in HCP-04 at 0.76 µg/L. These concentrations are above the RSL of 0.22 µg/L, but below the MCL of 80 µg/L.

PFOA was detected in all five (5) HCP wells sampled in 2023. PFOS was detected in four (4) HCP wells sampled in 2023. For PFOA, the MCL is 4 nanograms/Liter (ng/L) and the RSL is 0.0027 ng/L. For PFOS, the MCL is 4 ng/L and the RSL is 0.2 ng/L (USEPA, 2024). Below is a summary of the PFOA and PFOS 2023 results:

• PFOA ranged from 2.2 J ng/L at HCP-09 to 420 ng/L at HCP-06.

• Detected concentrations of PFOA exceeded the MCL and RSL at four (4) HCP wells

(HCP-02, HCP-04, HCP-05, and HCP-06).

• PFOA concentrations increased from 2022 to 2023 in HCP-05. The four (4) other well concentrations decreased from 2022 to 2023.

• PFOS ranged from 3.1 J ng/L at HCP-04 to 120 ng/L at HCP-06.

• Detected concentration of PFOS exceeded the MCL and RSL at three (3) of the HCP wells

(HCP-02, HCP-05, and HCP-06) and exceeded the RSL at HCP-04.

• PFOS concentrations increased from 2022 to 2023 in HCP-02 and -05. The remaining three

(3) wells concentrations decreased from 2022 to 2023.

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Ten (10) additional PFAS contaminants were detected in one or more of the five (5) HCP wells in 2023. Results show detections of perfluorobutanoic acid (PFBA), perfluorobutanesulfonic acid (PFBS), perfluoroheptanoic acid (PFHpA), perfluorohexanoic acid (PFHxA), perfluorohexanesulfonic acid (PFHxS), perfluorononanoic Acid (PFNA), perfluoropentanoic acid (PFPeA), perfluoropentanesulfonic acid (PFPeS), perfluoroheptanesulfonic acid (PFHpS), and 6:2 fluorotelomer sulfonic acid (6:2 FTS). Below is a summary of the 2023 additional PFAS detections for substances with a MCL and/or RSL value.

• PFBA was detected in all five (5) HCP wells with concentrations ranging from 2 J ng/L at HCP-04 to 15 ng/L at HCP-06. None of the detections exceed the RSL of 1,800 ng/L.

• PFBS was detected in four (4) HCP wells with concentrations ranging from 1.7 J ng/L at HCP-04 to 22 ng/L at HCP-06. None of the detections exceed the RSL of 600 ng/L.

• PFHxA was detected in five (5) HCP wells with concentrations ranging from 1.7 J ng/L at HCP-09 to 79 ng/L at HCP-06. None of the detections exceeded the RSL of 990 ng/L.

• PFHxS was detected in four (4) HCP wells with concentrations ranging from 2.5 J ng/L at HCP-04 to 260 ng/L at HCP-06. PFHxS concentrations at HCP-05 (74 ng/L) and HCP-06 (260 ng/L) exceeded exceeded both the MCL (10 ng/L) and RSL (39 ng/L). HCP-02 (21 ng/L) PFHxS detection exceeded the MCL but was below the RSL.

• PFNA was detected in two (2) HCP wells: HCP-05 (2.9 J ng/L) and HCP-06 (8.9 ng/L).

PFNA exceeded the RSL of 5.9 ng/L at HCP-06 but was reported below the MCL (10 ng/L).

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5.0 LONG-TERM MONITORING/MANAGEMENT

Forty-one (41) monitoring wells are sampled as part of the site’s CERCLA FYR events. All well samples are analyzed for TCL VOCs and PFAS. Previous FYR sampling events for the WBSA OU1 monitoring wells occurred in 2012, 2017, and 2021.

Overall, concentrations of PFOA have shown some reductions in concentrations between 2012 and 2021 as the contaminant is drawn towards the active production system. Concentrations of PFOS have increased from 2012 to 2021 expanding out laterally and vertically as it is drawn toward the production system. The differences in distribution of PFOA and PFOS indicates that PFOS appears to move slower toward the production system than PFOA. Lateral expansion of the PFAS plume toward the active production system is evident as wells that were non detect in 2012 have detections of PFAS contaminants in 2021. The results from the 2021 sampling event are further discussed in the 2022 Annual Report (RSJV, 2024).

The next CERCLA FYR sampling event is tentatively scheduled for 2026.

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6.0 SUMMARY

RAO activities for WBSA OU1 Groundwater from January to December 2023 involved semi-annual sampling of the Perryman Groundwater Pretreatment Facility influent, effluent, and finished water; five (5) year sampling of influent water for 1,4-dioxane and explosives; annual sampling of the HCP wells; and carbon vessel changeouts and refurbishments.

Samples of influent, effluent, and finished water were collected at the Perryman Groundwater Pretreatment Facility on 31 January 2023 and 29 November 2023. Detected VOCs in the influent samples were below the MCLs for drinking water supplies and are comparable to the previous year’s detections. In accordance with the five (5) year sampling, influent was sampled during November 2023 for 1,4-dixoane and explosives. There were no detections reported. Chloroform was detected with a J qualifier in the effluent sample during November 2023 at the RSL of 0.22 µg/L. VOCs detected in the plant effluent and finish water were below the MCLs for drinking water supplies. As noted below PFAS was detected in the HCP wells during 2023.

VOCs were not detected above MCLs for drinking water supplies in the five (5) HCP wells sampled in 2023. Production well HCP-05 contained the highest TCE concentration at 1.4 µg/L in November 2023. PFOA were detected in all five (5) HCP wells sampled in 2023. PFOA ranged from 2.2 J ng/L at HCP-09 to 420 ng/L at HCP-06. Detected concentrations of PFOA exceeded both the MCL (4 ng/L) and RSL (0.0027 ng/L) at four (4) HCP wells. PFOA concentrations increased from 2022 to 2023 in HCP-05. PFOS was detected in four (4) HCP wells sampled in 2023. PFOS ranged from 3.1 ng/L at HCP-04 to 120 ng/L at HCP-06. Detected concentration of PFOS exceeded both the MCL (4 ng/L) and RSL (0.2 ng/L) at three (3) of the HCP wells sampled and exceeded the RSL at HCP-04. PFOS concentrations increased from 2022 to 2023 in HCP-02 and -05. Ten (10) additional PFAS contaminants were detected in one or more of the five (5) HCP wells during 2023. Five (5) of the ten (10) additional PFAS contaminants have RSLs. PFHxS and PFNA have an MCL of 10 ng/L. Detected PFHxS concentrations exceeded both the MCL and RSL (39 ng/L) at HCP-05 and HCP-06. HCP-02 PFHxS detection exceeded the MCL but was below the RSL. PFNA exceeded the RSL (5.9 ng/L) at HCP-06 but was reported below the MCL. There were no other reported exceedances of the RSLs.

Operations and Maintenance (O&M) activities completed during 2023 included carbon vessel changeouts and refurbishments at all 11 vessels; totaling 220,000 pounds of carbon.

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7.0 REFERENCES

EA Engineering, Science and Technology, Inc., PBC. 2021. Edgewood and Aberdeen Areas.

Environmental Remediation Services: Long-Term Management Sites at Aberdeen Proving Ground, Annual LTM Report, Year 9 (2019-2020). APG, MD: Directorate of Public Works-Environmental Division (DPW-ED). May.

Harford County Public Works. 2023. 2023 Harford County Water Quality Report.

https://mde.maryland.gov/programs/water/water_supply/ConsumerConfidenceReports/D ocuments/CCR/Harford/0120016-%20Harford-County-DPW.pdf

HGS Engineering, Inc. 2016. Edgewood and Aberdeen Areas. Environmental Remediation Services: Long-Term Management Sites at Aberdeen Proving Ground, Operations & Management and Long-Term Monitoring Plan, Revision 2. APG, MD: DPW-ED. January.

Renova-Sovereign Joint Venture (RSJV). 2024. Western Boundary Study Area Operable Unit 1 Groundwater (AAWB01) 2022 Annual Report. APG, MD: Directorate of Public Works- Environmental Division (DPW-ED). May.

U.S. Army Garrison Aberdeen Proving Ground (APG). 2000. Western Boundary Study Area Operable Unit 1, Aberdeen Area, Aberdeen Proving Ground, Record of Decision. APG, MD: Directorate of Safety, Health and Environment. Final. July.

_____. 2019. Aberdeen Proving Ground, Aberdeen Area Fourth Five-Year Review Report. APG, MD: U.S. Army Environmental Command. Final. November.

U.S. Environmental Protection Agency (USEPA). 2024. Regional Screening Level Summary Table (Target Risk = 1E-06, Hazard Quotient = 0.1). https://www.epa.gov/risk/regional-screening-levels-rsls

USEPA Region III, APG, and U.S. Department of the Army, 1990. Federal Facility Agreement Under CERCLA Section 120, Aberdeen Proving Ground, Maryland. Administrative Docket Number III-FCA-CERC-004. USEPA Region III and U.S. Department of the Army. 27 March 1990.

https://mde.maryland.gov/programs/water/water_supply/ConsumerConfidenceReports/Documents/CCR/Harford/0120016-%20Harford-County-DPW.pdf https://mde.maryland.gov/programs/water/water_supply/ConsumerConfidenceReports/Documents/CCR/Harford/0120016-%20Harford-County-DPW.pdf https://www.epa.gov/risk/regional-screening-levels-rsls https://www.epa.gov/risk/regional-screening-levels-rsls

Title:

By: JKim

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Western Boundary

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Operable Unit 1 (OU1)

Aberdeen Area, APG

Notes:

Coordinate Projection: UTM Zone 18N (units: feet), Datum: WGS 84

Figure 1

Last Revised: 4/16/2025

Key Map

Michaelsville Landfill NPL Site

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Legend Monitoring Well Harford County Production Well Installation Boundary Buildings Streams Paving Wetland

Coordinate Projection:

UTM Zone 18 (feet), NAD 83

Figure 2 Western Boundary

Study Area Operable Unit 1 (AAWB01)

Sampling Locations Aberdeen Proving Ground

Maryland

Key Map

Map Area

0 900 1,800450 Feet

Five-year location samples in red

Western Boundary Study Area Operable Unit 1, 2023 Annual Report, APG, MD

Well sampled in 2023

Jennifer Schaefer Oval

Jennifer Schaefer Oval

Jennifer Schaefer Oval

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TABLES

Table 1. Detected VOCs in Harford County Perryman Groundwater Pretreatment Facility Samples 2023

Influent Port 1 Influent Port 2 Effluent Port 1 Effluent Port 2 Finish Water MCL RSL INF01-013123 Not Sampled EFF01-013123 Not Sampled FW-013123

80 0.22 0.33 J -- ND -- 0.21 J

5 0.28 1 -- ND -- ND

Influent Port 1 Influent Port 2 Effluent Port 1 Effluent Port 2a Finish Water

MCL RSL INF01-112923 INF02-112923 EFF01-112923 EFF02-112923 FW-112923

80 0.22 0.16 JM 0.16 J 0.22 J ND 0.11 J

100 120 ND ND 0.2 J 0.25 J ND

5 0.28 0.91 0.93 ND ND ND

a - Influent Port 2 and Effluent Port 2 were not sampled during the first semi-annual sampling due to the shutdown of granular activated carbon vessels 6 through 11 for carbon vessel refurbishments and changeouts.

µg/L - micrograms per liter MCL - U.S. Environmental Protection Agency Maximum Contaminant Levels (2024) RSL - U.S. Environmental Protection Agency Regional Screening Levels for Tap Water (Target Risk = 1E-06, Hazard Quotient of 0.1) (November 2024) J - Reported value is estimated because the value falls between the method detection limit and the quantitation limit M - Manual integrated compound Compounds not analyzed during a sampling round are designated with a -- Concentrations exceeding their respective MCL are listed in Bold text Concentrations exceeding their respective RSL are listed in Italicized text

First Semi-Annual 2023 VOC Concentrations (Method EPA 524.2)a

Second Semi-Annual 2023 VOC Concentrations (Method EPA 524.2)

Chloroform

Trichloroethene

Volatile Organic Compounds - µg/L

Volatile Organic Compounds - µg/L

Trichloroethene

Styrene

Chloroform

Table 2. Compounds and Substances Detected in Harford County Production Well Samples 2022 and 2023

HCP02 HCP02 HCP04 HCP04 HCP05 HCP05 HCP06 HCP06 HCP08 HCP08** HCP09 HCP09 TB FRB

8/17/2022 11/29/2023 8/17/2022 11/29/2023 8/17/2022 11/29/2023 8/17/2022 11/29/2023 8/17/2022 -- 8/17/2022 11/29/2023 11/29/2023 11/29/2023

9/27/2022* -- 9/27/2022* -- 9/27/2022* -- 9/27/2022* -- 9/27/2022* -- 9/27/2022* -- -- -- MCL RSL Sample Sample Sample Sample Sample Sample Sample Sample Sample Not Sampled Sample Sample Sample Sample

7 28 ND ND ND ND ND ND 0.16 J 0.15 J ND -- ND ND ND --

80 0.22 0.24 J 0.29 J 0.93 J 0.76 ND ND ND ND ND -- ND ND ND --

70 2.5 ND ND ND ND ND ND 0.18 J 0.19 J ND -- ND ND ND --

5 4.1 ND ND ND ND ND ND 0.15 J 0.13 J ND -- ND ND ND --

5 0.28 ND ND ND ND 1.7 1.4 1.7 1.2 ND -- ND ND ND --

-- -- 0.24 J ND 0.93 J 0.76 J ND ND 0.6 J ND ND -- ND ND ND --

-- 600 4.6 3.9 2.3 J 1.7 J 1.5 J 6.2 22 22 1.9 J -- ND ND -- ND

-- 1,800 2.3 J 2.3 J 2.3 J 2 J 1.9 J 6.2 16 15 2.6 J -- 4 2.7 J -- ND

-- -- 2.5 J 2 J 1.8 J 1.2 J 1.4 J 5.3 21 22 2 J -- 1.7 J 0.89 J -- ND

10 39 16 21 3.7 J 2.5 J 10 74 260 260 24 -- ND ND -- ND

-- 990 5.1 4.6 3.8 3.3 J 2.9 J 20 93 79 3.3 J -- 3.4 J 1.7 J -- ND

4 0.0027 11 7 8.8 5.3 6.9 85 470 420 5.3 -- 2.5 J 2.2 J -- ND

10 5.9 ND ND ND ND ND 2.9 J 9.9 8.9 1.1 J -- ND ND -- ND

4 0.2 28 42 4.4 3.1 J 12 61 170 120 21 -- 1.2 J ND -- ND

-- -- 3.4 J 3.1 J 3.4 J 2.6 J 2.4 J 15 48 44 3 J -- 2.8 J 1.6 J -- ND

-- -- ND ND ND ND ND 1.2 J 5.9 7.3 ND -- ND ND -- ND

-- -- ND ND ND ND ND 11 31 38 ND -- ND ND -- ND

-- -- 1.22 J 1.9 J ND ND ND 4.5 21.19 21 ND -- ND ND -- ND

* Production wells were sampled on 17 August 2022. PFAS data from that event was unusable due to laboratory cross contamination. The production wells were resampled on 27 September 2022.

** Samples were not collected from production well HCP-08 during 2023 because it was offline.

MCL - U.S. Environmental Protection Agency Maximum Contaminant Levels (2024)

RSL - U.S. Environmental Protection Agency Regional Screening Levels for Tap Water (Target Risk = 1E-06, Hazard Quotient of 0.1) (November 2024) Compounds without an MCL or RSL are designated with a -- in the criteria column µg/L - micrograms per liter ng/L - nanograms per liter TB- Trip Blank FRB - Field Reagent Blank ND - Non-detect, compound not detected above the method detection limit J - Reported value is estimated because the value falls between the method detection limit and the quantitation limit Compounds not analyzed during a sampling round are designated with a -- Concentrations exceeding their respective MCL are listed in Bold text Concentrations exceeding their respective RSL are listed in Italicized text

Perfluoropentanesulfonic acid (PFPeS)

Perfluoropentanoic Acid (PFPeA) Perfluoroheptanesulfonic Acid (PFHpS) 6:2 Fluorotelomer sulfonic acid (6:2 FTS)

Perfluoroheptanoic Acid (PFHpA) Perfluorohexanesulfonic Acid (PFHxS) Perfluorohexanoic Acid (PFHxA) Perfluorooctanoic Acid (PFOA) Perfluorononanoic Acid (PFNA)

Analyte Volatile Organic Compounds (µg/L)

Per- & Polyfluoroalkyl Substances (ng/L)

Perfluorooctanesulfonic Acid (PFOS)

Tetrachloroethene Trichloroethene Trihalomethanes (total)

Perfluorobutanesulfonic acid (PFBS) Perfluorobutanoic Acid (PFBA)

1,1-dichloroethene Chloroform cis-1,2-dichloroethene

APPENDICES

APPENDIX A

Laboratory Reports and SOP

Craig Myers

Sincerely, CMyers@aellab.com

February 08, 2023

Tara Weeks Environmental Chemical Corporation (ECC) 1304 Governor Ct Suite 101 Abingdon, MD 21009

RE: Workorder: J2301755 Perryman Treatment Plant

Dear Tara Weeks:

Enclosed are the analytical results for sample(s) received by the laboratory on Wednesday February 1, 2023. Results reported herein conform to the most current NELAC standards, where applicable, unless otherwise narrated in the body of the report. The analytical results for the samples contained in this report were submitted for analysis as outlined by the Chain of Custody and results pertain only to these samples.

If you have any questions concerning this report, please feel free to contact me.

Advanced Environmental Laboratories, Inc 6681 Southpoint Pkwy Jacksonville, FL 32216

Payments: P.O. Box 551580 Jacksonville, FL 32255-1580 Phone: (904) 363-9350

Fax: (904) 363-9354

Workorder:

FINAL

Perryman Treatment Plant (J2301755)

Wednesday, February 8, 2023 1:51:00 PM Dates and times are displayed using (-05:00)

POWERED BY

v.13.0.0

Certificate of Analysis This report shall not be reproduced, except in full, without the written consent of Advanced Environmental Laboratories, Inc.

NELAP Accredited E82574 www.aellab.com www.chemware.com

Sample Summary

Lab ID Sample ID Matrix Method Date Collected Date Received Analytes Reported Basis

J2301755001 EFF01-013123 WA 01/31/2023 09:07 02/01/2023 10:26 0 NA

J2301755002 INF01-013123 WA 01/31/2023 09:15 02/01/2023 10:26 0 NA

J2301755003 FW-013123 WA 01/31/2023 09:26 02/01/2023 10:26 0 NA

J2301755004 TB-013123 WA 01/31/2023 09:07 02/01/2023 10:26 0 NA

Advanced Environmental Laboratories, Inc 6681 Southpoint Pkwy Jacksonville, FL 32216

Payments: P.O. Box 551580 Jacksonville, FL 32255-1580 Phone: (904) 363-9350

Fax: (904) 363-9354

Workorder:

FINAL

Perryman Treatment Plant (J2301755)

Wednesday, February 8, 2023 1:51:00 PM Dates and times are displayed using (-05:00)

POWERED BY

v.13.0.0

Certificate of Analysis This report shall not be reproduced, except in full, without the written consent of Advanced Environmental Laboratories, Inc.

NELAP Accredited E82574

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ANALYTICAL REPORT

PREPARED FOR

Attn: Steve Warren

Advanced Environmental Laboratory Inc 6681 Southpoint Pkwy

Jacksonville, Florida 32216 Generated 2/6/2023 12:52:45 PM

JOB DESCRIPTION

Perryman Treatment Plant

JOB NUMBER

410-113932-1

See page two for job notes and contact information.

Lancaster PA 17601 2425 New Holland Pike Eurofins Lancaster Laboratories Environment Testing, LLC https://eol.et.eurofinsus.com/myEOL/

Eurofins Lancaster Laboratories Environment Testing, LLC

Eurofins Lancaster Laboratories is a laboratory within Eurofins Lancaster Laboratories Environment Testing, LLC, a company within Eurofins Environment Testing Group of Companies

Job Notes

Analytical test results meet all requirements of the associated regulatory program (i.e., NELAC (TNI), DoD, and ISO 17025) unless otherwise noted under the individual analysis.

Authorization

Generated

2/6/2023 12:52:45 PM

Authorized for release by Amanda Barnhart, Project Manager Amanda.Barnhart@et.eurofinsus.com (717)556-3860

Page 2 of 25 2/6/2023

Eurofins Lancaster Laboratories Environment Testing, LLC

Compliance Statement Analytical test results meet all requirements of the associated regulatory program (e.g., NELAC (TNI), DoD, and ISO 17025) unless otherwise noted under the individual analysis. Data qualifiers are applied to note exceptions. Noncompliant quality control (QC) is further explained in narrative comments.

· QC results that exceed the upper limits and are associated with non-detect samples are qualified but further narration is not required since the bias is high and does not change a non-detect result. Further narration is also not required with QC blank detection when the associated sample concentration is non-detect or more than ten times the level in the blank.

· Matrix QC may not be reported if insufficient sample or site-specific QC samples were not submitted. In these situations, to demonstrate precision and accuracy at a batch level, a LCS/LCSD is performed, unless otherwise specified in the method.

· Surrogate and/or isotope dilution analyte recoveries (if applicable) which are outside of the QC window are confirmed unless attributed to a dilution or otherwise noted in the narrative.

Regulated compliance samples (e.g. SDWA, NPDES) must comply with the associated agency requirements/permits.

Measurement uncertainty values, as applicable, are available upon request.

Test results relate only to the sample tested. Clients should be aware that a critical step in a chemical or microbiological analysis is the collection of the sample. Unless the sample analyzed is truly representative of the bulk of material involved, the test results will be meaningless. If you have questions regarding the proper techniques of collecting samples, please contact us. We cannot be held responsible for sample integrity, however, unless sampling has been performed by a member of our staff. Times are local to the area of activity. Parameters listed in the 40 CFR Part 136 Table II as "analyze immediately" and tested in the laboratory are not performed within 15 minutes of collection.

This report shall not be reproduced except in full, without the written approval of the laboratory.

WARRANTY AND LIMITS OF LIABILITY - In accepting analytical work, we warrant the accuracy of test results for the sample as submitted. The foregoing express warranty is exclusive and is given in lieu of all other warranties, expressed or implied, except as otherwise agreed. We disclaim any other warranties, expressed or implied, including a warranty of fitness for particular purpose and warranty of merchantability. In no event shall Eurofins Lancaster Laboratories Environmental, LLC be liable for indirect, special, consequential, or incidental damages including, but not limited to, damages for loss of profit or goodwill regardless of (A) the negligence (either sole or concurrent) of Eurofins Lancaster Laboratories Environmental and

(B) whether Eurofins Lancaster Laboratories Environmental has been informed of the possibility of such damages. We accept no legal responsibility for the purposes for which the client uses the test results. Except as otherwise agreed, no purchase order or other order for work shall be accepted by Eurofins Lancaster Laboratories Environmental which includes any conditions that vary from the Standard Terms and Conditions, and Eurofins Lancaster Laboratories Environmental hereby objects to any conflicting terms contained in any acceptance or order submitted by client.

Page 3 of 25 2/6/2023

Table of Contents

Client: Advanced Environmental Laboratory Inc Project/Site: Perryman Treatment Plant

Laboratory Job ID: 410-113932-1

Eurofins Lancaster Laboratories Environment Testing, LLC

2/6/2023

Cover Page

Table of Contents

Definitions/Glossary

Case Narrative

Detection Summary

Client Sample Results

Surrogate Summary

QC Sample Results

QC Association Summary

Lab Chronicle

Certification Summary

Method Summary

Sample Summary

Chain of Custody

Receipt Checklists

Definitions/Glossary Job ID: 410-113932-1Client: Advanced Environmental Laboratory Inc

Project/Site: Perryman Treatment Plant

Qualifiers

GC/MS VOA

Qualifier Description

J Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.

Qualifier

M Manual integrated compound.

U Indicates the analyte was analyzed for but not detected.

Glossary

These commonly used abbreviations may or may not be present in this report.

¤ Listed under the "D" column to designate that the result is reported on a dry weight basis

Abbreviation

%R Percent Recovery

CFL Contains Free Liquid

CFU Colony Forming Unit

CNF Contains No Free Liquid

DER Duplicate Error Ratio (normalized absolute difference)

Dil Fac Dilution Factor

DL Detection Limit (DoD/DOE)

DL, RA, RE, IN Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample

DLC Decision Level Concentration (Radiochemistry)

EDL Estimated Detection Limit (Dioxin)

LOD Limit of Detection (DoD/DOE)

LOQ Limit of Quantitation (DoD/DOE)

MCL EPA recommended "Maximum Contaminant Level"

MDA Minimum Detectable Activity (Radiochemistry)

MDC Minimum Detectable Concentration (Radiochemistry)

MDL Method Detection Limit

ML Minimum Level (Dioxin)

MPN Most Probable Number

MQL Method Quantitation Limit

NC Not Calculated

ND Not Detected at the reporting limit (or MDL or EDL if shown)

NEG Negative / Absent

POS Positive / Present

PQL Practical Quantitation Limit

PRES Presumptive

QC Quality Control

RER Relative Error Ratio (Radiochemistry)

RL Reporting Limit or Requested Limit (Radiochemistry)

RPD Relative Percent Difference, a measure of the relative difference between two points

TEF Toxicity Equivalent Factor (Dioxin)

TEQ Toxicity Equivalent Quotient (Dioxin)

TNTC Too Numerous To Count

Eurofins Lancaster Laboratories Environment Testing, LLC

Page 5 of 25 2/6/2023

Case Narrative Client: Advanced Environmental Laboratory Inc Job ID: 410-113932-1

Project/Site: Perryman Treatment Plant

Job ID: 410-113932-1

Laboratory: Eurofins Lancaster Laboratories Environment Testing, LLC

Narrative

Job Narrative

410-113932-1

Receipt

The samples were received on 2/1/2023 10:26 AM. Unless otherwise noted below, the samples arrived in good condition, and, where required, properly preserved and on ice. The temperature of the cooler at receipt time was 0.8°C

GC/MS VOA

No additional analytical or quality issues were noted, other than those described above or in the Definitions/ Glossary page.

Eurofins Lancaster Laboratories Environment Testing, LLC Page 6 of 25 2/6/2023

Detection Summary

Project/Site: Perryman Treatment Plant

Client Sample ID: EFF01-013123 Lab Sample ID: 410-113932-1

No Detections.

Client Sample ID: INF01-013123 Lab Sample ID: 410-113932-2

DLLOQ

ug/L0.100.50Chloroform

LOD

0.40

Analyte Result Qualifier Unit Dil Fac D Method Prep Type

Total/NA1J0.33 524.2 ug/L0.50 0.10Trichloroethene 0.40 Total/NA11.0 524.2

Client Sample ID: FW-013123 Lab Sample ID: 410-113932-3

DLLOQ

ug/L0.100.50Chloroform

LOD

0.40

Analyte Result Qualifier Unit Dil Fac D Method Prep Type

Total/NA1J0.21 524.2

Client Sample ID: TB-013123 Lab Sample ID: 410-113932-4

No Detections.

Eurofins Lancaster Laboratories Environment Testing, LLC

This Detection Summary does not include radiochemical test results.

Page 7 of 25 2/6/2023

Client Sample Results

Project/Site: Perryman Treatment Plant

Lab Sample ID: 410-113932-1Client Sample ID: EFF01-013123 Matrix: WaterDate Collected: 01/31/23 09:07

Date Received: 02/01/23 10:26

Method: EPA-DW 524.2 - Volatile Organic Compounds (GC/MS)

LOQ DLLOD

0.40 U 0.50 0.10 ug/L 102/03/23 17:440.40

Analyte Dil FacAnalyzedUnit DResult Qualifier

1,1,1,2-Tetrachloroethane

102/03/23 17:44ug/L0.100.400.50U0.401,1,1-Trichloroethane

102/03/23 17:44ug/L0.100.400.50U0.401,1,2,2-Tetrachloroethane

102/03/23 17:44ug/L0.100.400.50U0.401,1,2-Trichloroethane

102/03/23 17:44ug/L0.100.400.50U0.401,1-Dichloroethane

102/03/23 17:44ug/L0.100.400.50U0.401,1-Dichloroethene

102/03/23 17:44ug/L0.100.400.50U0.401,1-Dichloropropene

102/03/23 17:44ug/L0.200.400.50U0.401,2,3-Trichlorobenzene

102/03/23 17:44ug/L0.200.400.50U0.401,2,3-Trichloropropane

102/03/23 17:44ug/L0.200.400.50U0.401,2,4-Trichlorobenzene

102/03/23 17:44ug/L0.100.400.50U0.401,2,4-Trimethylbenzene

102/03/23 17:44ug/L0.100.400.50U0.401,2-Dichlorobenzene

102/03/23 17:44ug/L0.100.400.50U0.401,2-Dichloroethane

102/03/23 17:44ug/L0.100.400.50U0.401,2-Dichloropropane

102/03/23 17:44ug/L0.100.400.50U0.401,3,5-Trimethylbenzene

102/03/23 17:44ug/L0.100.400.50U0.401,3-Dichlorobenzene

102/03/23 17:44ug/L0.100.400.50U0.401,3-Dichloropropane

102/03/23 17:44ug/L0.100.400.50U0.401,4-Dichlorobenzene

102/03/23 17:44ug/L0.200.400.50U0.402,2-Dichloropropane

102/03/23 17:44ug/L0.200.400.50U0.401-Chlorobutane

102/03/23 17:44ug/L0.100.400.50U0.402-Chlorotoluene

102/03/23 17:44ug/L0.200.400.50U0.404-Chlorotoluene

102/03/23 17:44ug/L0.100.400.50U0.40Benzene

102/03/23 17:44ug/L0.100.400.50U0.40Bromobenzene

102/03/23 17:44ug/L0.100.400.50U0.40Bromochloromethane

102/03/23 17:44ug/L0.100.400.50U0.40Bromodichloromethane

102/03/23 17:44ug/L0.200.400.50U0.40Bromoform

102/03/23 17:44ug/L0.100.400.50U0.40Bromomethane

102/03/23 17:44ug/L0.100.400.50U0.40Carbon tetrachloride

102/03/23 17:44ug/L0.100.400.50U0.40Chlorobenzene

102/03/23 17:44ug/L0.200.400.50U0.40Chloroethane

102/03/23 17:44ug/L0.100.400.50U0.40Chloroform

102/03/23 17:44ug/L0.200.400.50U0.40Chloromethane

102/03/23 17:44ug/L0.100.400.50U0.40cis-1,2-Dichloroethene

102/03/23 17:44ug/L0.100.400.50U0.40cis-1,3-Dichloropropene

102/03/23 17:44ug/L0.100.400.50U0.40Dibromochloromethane

102/03/23 17:44ug/L0.100.400.50U0.40Dibromomethane

102/03/23 17:44ug/L0.200.400.50U0.40Dichlorodifluoromethane

102/03/23 17:44ug/L0.100.400.50U0.40Ethylbenzene

102/03/23 17:44ug/L0.200.400.50U0.40Hexachlorobutadiene

102/03/23 17:44ug/L0.100.400.50U0.40Isopropylbenzene

102/03/23 17:44ug/L0.200.401.0U0.40m&p-Xylene

102/03/23 17:44ug/L0.200.400.50U0.40Methylene Chloride

102/03/23 17:44ug/L0.200.400.50U0.40n-Butylbenzene

102/03/23 17:44ug/L0.100.400.50U0.40N-Propylbenzene

102/03/23 17:44ug/L0.200.400.50U0.40Naphthalene

102/03/23 17:44ug/L0.100.400.50U0.40o-Xylene

102/03/23 17:44ug/L0.100.400.50U0.40p-Isopropyltoluene

102/03/23 17:44ug/L0.100.400.50U0.40sec-Butylbenzene

Eurofins Lancaster Laboratories Environment Testing, LLC

Page 8 of 25 2/6/2023

Project/Site: Perryman Treatment Plant

Lab Sample ID: 410-113932-1Client Sample ID: EFF01-013123 Matrix: WaterDate Collected: 01/31/23 09:07

Date Received: 02/01/23 10:26

Method: EPA-DW 524.2 - Volatile Organic Compounds (GC/MS) (Continued)

LOQ DLLOD

0.40 U 0.50 0.10 ug/L 102/03/23 17:440.40

Analyte Dil FacAnalyzedUnit DResult Qualifier

Styrene

102/03/23 17:44ug/L0.100.400.50U0.40tert-Butylbenzene

102/03/23 17:44ug/L0.100.400.50U0.40Tetrachloroethene

102/03/23 17:44ug/L0.100.400.50U0.40Ethyl methacrylate

102/03/23 17:44ug/L0.100.400.50U0.40Toluene

102/03/23 17:44ug/L0.100.400.50U0.40trans-1,2-Dichloroethene

102/03/23 17:44ug/L0.100.400.50U0.40trans-1,3-Dichloropropene

102/03/23 17:44ug/L0.100.400.50U M0.40Trichloroethene

102/03/23 17:44ug/L0.200.400.50U0.40Trichlorofluoromethane

102/03/23 17:44ug/L0.100.400.50U0.40Vinyl chloride

102/03/23 17:44ug/L0.100.400.50U0.40Methyl tertiary butyl ether

102/03/23 17:44ug/L0.501.02.0U1.0Trihalomethanes (total)

102/03/23 17:44ug/L0.100.400.50U0.40Xylene (total)

4-Bromofluorobenzene (Surr) 88 80 - 120 02/03/23 17:44 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

1,2-Dichlorobenzene-d4 (Surr) 93 02/03/23 17:44 180 - 120

Lab Sample ID: 410-113932-2Client Sample ID: INF01-013123 Matrix: WaterDate Collected: 01/31/23 09:15

Date Received: 02/01/23 10:26

Method: EPA-DW 524.2 - Volatile Organic Compounds (GC/MS)

LOQ DLLOD

0.40 U 0.50 0.10 ug/L 102/03/23 18:080.40

Analyte Dil FacAnalyzedUnit DResult Qualifier

1,1,1,2-Tetrachloroethane

102/03/23 18:08ug/L0.100.400.50U0.401,1,1-Trichloroethane

102/03/23 18:08ug/L0.100.400.50U0.401,1,2,2-Tetrachloroethane

102/03/23 18:08ug/L0.100.400.50U0.401,1,2-Trichloroethane

102/03/23 18:08ug/L0.100.400.50U0.401,1-Dichloroethane

102/03/23 18:08ug/L0.100.400.50U0.401,1-Dichloroethene

102/03/23 18:08ug/L0.100.400.50U0.401,1-Dichloropropene

102/03/23 18:08ug/L0.200.400.50U0.401,2,3-Trichlorobenzene

102/03/23 18:08ug/L0.200.400.50U0.401,2,3-Trichloropropane

102/03/23 18:08ug/L0.200.400.50U0.401,2,4-Trichlorobenzene

102/03/23 18:08ug/L0.100.400.50U0.401,2,4-Trimethylbenzene

102/03/23 18:08ug/L0.100.400.50U0.401,2-Dichlorobenzene

102/03/23 18:08ug/L0.100.400.50U0.401,2-Dichloroethane

102/03/23 18:08ug/L0.100.400.50U0.401,2-Dichloropropane

102/03/23 18:08ug/L0.100.400.50U0.401,3,5-Trimethylbenzene

102/03/23 18:08ug/L0.100.400.50U0.401,3-Dichlorobenzene

102/03/23 18:08ug/L0.100.400.50U0.401,3-Dichloropropane

102/03/23 18:08ug/L0.100.400.50U0.401,4-Dichlorobenzene

102/03/23 18:08ug/L0.200.400.50U0.402,2-Dichloropropane

102/03/23 18:08ug/L0.200.400.50U0.401-Chlorobutane

102/03/23 18:08ug/L0.100.400.50U0.402-Chlorotoluene

102/03/23 18:08ug/L0.200.400.50U0.404-Chlorotoluene

102/03/23 18:08ug/L0.100.400.50U0.40Benzene

102/03/23 18:08ug/L0.100.400.50U0.40Bromobenzene

102/03/23 18:08ug/L0.100.400.50U0.40Bromochloromethane

102/03/23 18:08ug/L0.100.400.50U0.40Bromodichloromethane

Eurofins Lancaster Laboratories Environment Testing, LLC

Page 9 of 25 2/6/2023

Project/Site: Perryman Treatment Plant

Lab Sample ID: 410-113932-2Client Sample ID: INF01-013123 Matrix: WaterDate Collected: 01/31/23 09:15

Date Received: 02/01/23 10:26

Method: EPA-DW 524.2 - Volatile Organic Compounds (GC/MS) (Continued)

LOQ DLLOD

0.40 U 0.50 0.20 ug/L 102/03/23 18:080.40

Analyte Dil FacAnalyzedUnit DResult Qualifier

Bromoform

102/03/23 18:08ug/L0.100.400.50U0.40Bromomethane

102/03/23 18:08ug/L0.100.400.50U0.40Carbon tetrachloride

102/03/23 18:08ug/L0.100.400.50U0.40Chlorobenzene

102/03/23 18:08ug/L0.200.400.50U0.40Chloroethane

102/03/23 18:08ug/L0.100.400.50J0.33Chloroform

102/03/23 18:08ug/L0.200.400.50U0.40Chloromethane

102/03/23 18:08ug/L0.100.400.50U0.40cis-1,2-Dichloroethene

102/03/23 18:08ug/L0.100.400.50U0.40cis-1,3-Dichloropropene

102/03/23 18:08ug/L0.100.400.50U0.40Dibromochloromethane

102/03/23 18:08ug/L0.100.400.50U0.40Dibromomethane

102/03/23 18:08ug/L0.200.400.50U0.40Dichlorodifluoromethane

102/03/23 18:08ug/L0.