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Home My WebLink AboutWS-2804_6769_CA_MRP_202303162401 Brentwood Road, Suite 107 Raleigh, NC 27604 P (919) 873-2211 F (919) 873-9555 Terracon.com March 16, 2023 Ms. Linda Blalock North Carolina Department of Environmental Quality Division of Waste Management 1646 Mail Service Center Raleigh, North Carolina 27699-1646 Email:linda.blalock@ncdenr.gov Re: Annual Monitoring Report Former Erect Grocery 7816 Erect Road Seagrove, Randolph County, North Carolina UST Incident Number: 6769 Terracon Project No. 70207596 Dear Ms. Blalock: Terracon Consultants, Inc. is pleased to submit this Annual Monitoring Report for the above-referenced property. This report has been prepared in general accordance with North Carolina Department of Environmental Quality, Underground Storage Tank (UST) Section Assessment Guidelines and Corrective Action Guidelines for Petroleum and Hazardous Substance UST Releases / Petroleum Non-UST Releases,dated January 19, 2021, and Task Authorization No. 05 approved on January 24, 2023. If you have any questions regarding this report or the assessment activities, please contact us at 919-873-2211. Sincerely, Terracon Consultants, Inc. Alexander Manolukas Ethan C. Dinwiddie, PG Field Scientist Senior Staff Geologist Justin F. Fabriziani, RSM Environmental Department Manager Enclosures ANNUAL MONITORING REPORT Former Erect Grocery (Incident #6769) 7816 Erect Road Seagrove, Randolph County, North Carolina March 16, 2023 Terracon Project No. 70207596 Prepared for: North Carolina Department of Environmental Quality Division of Waste Management Raleigh, North Carolina Prepared by: Terracon Consultants, Inc. Raleigh, North Carolina Explore with us ii TABLE OF CONTENTS A.SITE INFORMATION .................................................................................................... 1 B.EXECUTIVE SUMMARY ............................................................................................... 2 C.SITE HISTORY AND CHARACTERIZATION ................................................... 3 C.1 Site Setting ........................................................................................................................................ 4 C.2 Release Summary .......................................................................................................................... 4 C.3 Previous Investigations .............................................................................................................. 6 C.4 Potential Receptors ....................................................................................................................... 7 D.ASSESSMENT INFORMATION ................................................................................ 8 D.1 Assessment Activities .................................................................................................................. 8 D.1.1 Free Product Evaluation .............................................................................................................. 8 D.1.2 Groundwater Sampling Activities........................................................................................... 8 D.2 Groundwater Analytical Results ............................................................................................. 9 E.CONCLUSIONS AND RECOMMENDATIONS ................................................. 10 REFERENCES .............................................................................................................................. 12 EXHIBITS Exhibit 1: Topographic Vicinity Map Exhibit 2: Site Diagram Exhibit 3: Water Supply Well Location Map Exhibit 4: Groundwater Elevation Map (February 2023) Exhibit 5: Groundwater Analytical Results Map (February 2023) Exhibit 6: Benzene Isoconcentration Map (February 2023) Exhibit 7: 1,2-Dichloroethane Isoconcentration Map (February 2023) Exhibit 8: Diisopropyl Ether Isoconcentration Map (February 2023) Exhibit 9: Methyl tert-Butyl Ether (MTBE) Isoconcentration Map (February 2023) Exhibit 10: Naphthalene Isoconcentration Map (February 2023) Explore with us ii TABLE OF CONTENTS (CONTINUED) TABLES Table 1: Conceptual Site Model Table 2: Water Supply Well Information Table 3: Monitoring Well Construction Information and Historical Groundwater Elevations Table 4: Summary of Groundwater Analytical Results APPENDIX Appendix A: Photographs and Field Notes Appendix B: Laboratory Analytical Results and Chain-of-Custody Form Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 1 ANNUAL MONITORING REPORT A.SITE INFORMATION Date of Report:March 16, 2023 UST Number:RA-2804 NCDEQ Incident No: 6769 Facility ID:00-0-0000030709 Site Name:Former Erect Grocery Site Location:7816 Erect Road, Seagrove, North Carolina Latitude/Longitude: N 35.559046 W 79.659466 UST Owner/Operator: N/A Current Property Charles and Harold Teague Owner:7711 Erect Road Seagrove, North Carolina 27341 (336) 879-5157 Current Property Teague Store Occupant: Consultant:Terracon Consultants, Inc. (Contact: Justin L. Fabriziani) 2401 Brentwood Road, Suite 107 Raleigh, North Carolina 27604 919-873-2211 Laboratory(s):Pace Analytical Services, LLC. (NCDEQ No. 329) 106 Vantage Point Drive West Columbia, South Carolina 29712 803-227-2704 Release Information:Release Discovery Date: June 1990 Estimated Quantity: Unknown Cause of Release: Two 2,000-gallon gasoline underground storage tanks (USTs), possible additional USTs include one 2,000-gallon gasoline UST and one 550-gallon gasoline UST Currently Active Tanks: Four above ground storage tanks (ASTs) Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 2 I, Ethan C. Dinwiddie, a Licensed Geologist for Terracon Consultants, Inc. (Terracon), do certify that the information contained in this report is correct and accurate to the best of my knowledge. Ethan C. Dinwiddie NC License No. 2801 Terracon is licensed to practice geology and engineering in North Carolina. The certification numbers of the corporation are C-367 and F-0869, respectively. B.EXECUTIVE SUMMARY The Former Erect Grocery site has operated as a gas station from at least the 1990s to the present. The site currently operates as a gas station known as the Teague Store. A release from two former 2,000-gallon gasoline underground storage tanks (USTs) located on the site was initially discovered in May 1990, when laboratory analyses revealed petroleum contaminants in soil surrounding the UST basin. The USTs were subsequently removed in November 1990 and closure soil samples indicated concentrations of total petroleum hydrocarbons (TPH) above North Carolina Department of Environmental Quality (NCDEQ) Action Levels. Subsequent site investigations have included soil borings, monitoring well installations, and two Mobile Multi-Phase Extraction (MMPE) events. At the direction of NCDEQ, Terracon mobilized to the site on February 7, 2023 to sample groundwater from four on-site monitoring wells (RW-1 and MW-1 through MW-3) and one water supply well (WSW-1) for analysis of volatile organic compounds (VOCs). Based on information obtained during the completion of the groundwater monitoring activities, Terracon provides the following conclusions and findings: n Groundwater depths in the monitoring wells ranged from 22.50 to 23.23 feet below top of casing (bTOC) and groundwater is estimated to flow to the northwest. Based on the results from the August 2022 gauging event; however, the direction of groundwater flow was to the southeast. The direction of Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 3 groundwater flow is possibly not known with certainty due to the relatively close spacing of the monitoring wells. The direction also may be seasonably variable due to the location of the site near to a groundwater divide. n Measurable thicknesses of free product were not detected in the monitoring wells during the February 2023 monitoring event; however, 0.02 feet of free product was detected in MW-3 during the April 2022 aquifer slug testing event. Free product thicknesses have also historically been observed in MW-1 and MW-2. n Benzene; 1,2-dichloroethane (1,2-DCA); diisopropyl ether (IPE); methyl tert- butyl ether (MTBE); naphthalene; n-propylbenzene; and total xylenes were detected in monitoring wells RW-1, MW-1, MW-2, and/or MW-3 at concentrations exceeding the North Carolina Administrative Code 2L Groundwater Quality Standards (2L standards). n Exceedances of the North Carolina Gross Contamination Levels (GCLs) were not identified in the monitoring wells. However, benzene was detected in RW-1 in April 2019 and 1,2-DCA detected in MW-3 in April 2019 at concentrations that exceeded the GCLs. n The contaminant plume has not been delineated and may extend off the site. The contaminant plume is not delineated vertically, and vertical delineation may be necessary due to nearby water supply wells. n Three active water supply wells were identified within 1,000 feet of the source area. WSW-1 (hydraulically downgradient) and WSW-2 (hydraulically cross- gradient) are the closest water supply wells to the source area and are situated approximately 300 feet northwest and 650 feet northeast of the source area, respectively. The site is served by WSW-1, which has been sampled periodically since at least July 2005 and has not contained detectable concentrations of petroleum constituents. Municipal water is reportedly not available to the site and surrounding properties. n VOCs were not detected above the laboratory reporting limits in the sample collected from WSW-1 during this sampling event. C.SITE HISTORY AND CHARACTERIZATION The purpose of this report is to evaluate the current groundwater quality at the site. Terracon completed this report to summarize the findings of assessment activities performed in February 2023 at the Former Erect Grocery site located at 7816 Erect Road in Seagrove, Randolph County, North Carolina. This Annual Monitoring Report Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 4 was prepared for the site in response to a request by Ms. Linda Blalock, Engineer with the NCDEQ Division of Waste Management, State Lead Program. The Annual Monitoring Report was prepared in general accordance with the 15A North Carolina Administrative Code 2L.0115 regulations and the NCDEQ UST Section Assessment Guidelines and Corrective Action Guidelines for Petroleum and Hazardous Substance UST Releases / Petroleum Non-UST Releases, dated January 19, 2021, under the supervision of Mr. Ethan C. Dinwiddie, a North Carolina Licensed Geologist (North Carolina License No. 2801). C.1 Site Setting The Former Erect Grocery site is comprised of 0.92 acres and contains a single-story commercial building that currently operates as a gas station known as Teague Store. The remainder of the site consists of three dispenser islands supplied by four on-site above ground storage tanks (located on the western portion of the site), and paved, gravel, and grassy areas. The surrounding properties primarily consist of agricultural fields with residences to the east. The Coleridge Volunteer Fire Department (Station No. 10) is located to the north. The site and surrounding properties are depicted on Exhibit 1 and Exhibit 2. C.2 Release Summary The release at the site was discovered in May 1990, when laboratory analyses of soil samples collected prior to UST excavations revealed a TPH concentration of 5,050 parts per million (ppm). Two 2,000-gallon gasoline USTs were removed in November 1990. A composite soil sample collected from each corner of the excavation at a depth of 9 feet below land surface (bls) indicated a concentration of 410 ppm of TPH remaining in the surrounding soil. On May 6, 2022, Linda Blalock, the NCDEQ Project Manager provided information via email from the NCDEQ UST Section Permits and Inspections Branch database that indicates an additional 2,000-gallon gasoline UST and 550-gallon gasoline UST were removed from the site in 1990. Supporting this information is a Notification of Tank Closure dated May 3, 1990 that lists four USTs to be removed; however, removal documentation of the additional USTs was unavailable for review including the location of the USTs. In May 2022, Terracon contacted the descendants of the former site owner (Mr. Lewis Teague) for potential information about the additional USTs. Mr. George Teague, Lewis’ son, reported that to his knowledge there were four USTs and that they were removed in 1990. Mr. George Teague forwarded copies of his records Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 5 pertaining the USTs to Terracon in May 2022. Upon review, Mr. Teague’s files did indicate the removal of four USTs; however, location and other closure documentation were not available. In September 2022, Terracon contacted the NCDEQ UST Section Raleigh and Winston- Salem Regional Offices and the Permits and Inspections Branch for additional files related to the removal of the four USTs from the site in 1990. Ms. Mindy Lepard with the Winston-Salem Regional Office (WSRO) reported that related files could be found on the NCDEQ Laserfiche database and that the WSRO did not have physical copies of the incident files. Mr. Mickey Roberts with the Raleigh Regional Office reported similarly to Ms. Mindy Lepard regarding the incident files. Ms. Ruth Strauss with the Permits and Inspections Branch provided documentation of UST notification and fee payment forms and reported that available documentation had been electronically uploaded to the Permits and Inspections Branch database. The UST notification form indicates the 2,000-gallon USTs contained gasoline and the 550-gallon UST contained diesel. The payment forms indicate the USTs were removed in January 1990. Additional documentation, including closure reports and location information, was unavailable for review. In September 2022, Terracon contacted Mr. George Teague again for potential anecdotal knowledge of the former UST locations. A follow-up response from Mr. George Teague was not received at the issuance of this report. Supporting information provided for the additional USTs is provided in Terracon’s Annual Monitoring Report dated September 29, 2022 (Terracon, 2022b). The following table summarizes the reported operation and abandonment of the USTs and ASTs: ID Type Contents Volume (gallons)Installed Abandoned Method 1 UST Gasoline 2,000 09/29/1959 01/1990 Removal 2 UST Gasoline 2,000 09/29/1959 01/1990 Removal 3 UST Gasoline 2,000 09/29/1959 01/1990 Removal 4 UST Diesel 550 09/29/1959 01/1990 Removal 5 AST Gasoline 10,000 Unknown N/A - Active N/A 6 AST Multi- compartment (Gasoline / Diesel) 6,000 Gasoline / 4,000 Diesel Unknown N/A - Active N/A 7 AST Diesel 4,000 Unknown N/A - Active N/A 8 AST Kerosene 550 Unknown N/A - Active N/A Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 6 C.3 Previous Investigations In June and July 2005, Pyramid Environmental & Engineering, P.C. completed a Phase I Limited Site Assessment to assess soil and groundwater conditions as well as sample supply wells within 500 feet of the source area. During this time, MW-1 was installed in the immediate vicinity of the two former 2,000-gallon gasoline USTs. Samples collected from MW-1 indicated several petroleum constituents were present above their respective 2L standards. Nearby water supply wells did not indicate contamination exceeding laboratory reporting limits (Pyramid, 2005). In January 2018, Terracon installed two groundwater monitoring wells (MW-2 and MW- 3) along the western and southern sides of the dispenser island canopy. Free product was measured at a thickness of 0.51 feet in monitoring well MW-1. Terracon then installed a recovery well (RW-1) in the former UST basin and collected groundwater samples from MW-2 and MW-3. Analysis of the groundwater samples collected from MW-2 and MW-3 indicated concentrations of petroleum contaminants exceeding the 2L standards. Additionally, four soil borings (SB-1, SB-2, SB-3, SB-4) along the former UST basin perimeter were advanced to approximately 30 feet bls. Analysis of the soil samples indicated concentrations of petroleum constituents exceeding Soil-to-Water (STW) Maximum Soil Contaminant Concentrations (MSCCs) in all of the soil samples and a concentration of C9-C22 aromatics exceeding the Residential MSCC in SB-3 (Terracon, 2020). In March 2019, Advanced Environmental Services (AES) at Terracon’s direction, performed a 96-hour Mobile Multi-Phase Extraction (MMPE) event at wells MW-1 and RW-1. Prior to conducting the MMPE event, 0.19 feet of free product was measured in monitoring well MW-1 (Terracon, 2019). According to the AES field report dated April 2, 2019, a total of 3,343 gallons of a product/water mixture was recovered from the two wells. Mass balance calculations indicated total VOC emissions removed from the wells was approximately 2 gallons (Terracon, 2020). In April 2019, Terracon advanced four more soil borings near the main fuel dispenser island and collected groundwater samples from the on-site monitoring wells. Multiple petroleum constituents were recovered in soil samples at concentrations exceeding the STW MSCCs. Additionally, various petroleum constituents were detected in groundwater samples at concentrations exceeding the 2L standards. Benzene and 1,2- DCA were detected above the GCLs in RW-1 and MW-3 (Terracon, 2019). In January 2020, AES at Terracon’s direction, conducted another 96-hour MMPE event at wells MW-1 and RW-1. Free product was not detected in any of the wells prior to the Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 7 event. According to the AES field report dated February 3, 2020, a total of 3,389 gallons of a product/water mixture was recovered from the two wells. Mass balance calculations indicated total VOC emissions removed from the wells was approximately 2 gallons (Terracon, 2020). Terracon returned to the site in February 2020 to collect groundwater samples. Free product was not detected in any of the wells prior to sampling. Analytical results revealed several petroleum constituents at concentrations exceeding the 2L standards (Terracon, 2020). Contaminants were not detected in water supply well WSW-1. In March 2021, Terracon performed a groundwater monitoring event that identified similar concentrations of petroleum constituent concentrations in the monitoring wells (Terracon, 2021). A Conceptual Site Model is presented in Table 1 that summarizes the site information and historical investigation results. Terracon returned to the site in April 2022 and performed sampling and an aquifer testing event. Terracon conducted a fate and transport model. Results of the BIOSCREEN modeling work indicated that the dissolved-phase petroleum contaminants should naturally degrade and are unlikely to impact WSW-1 in a 30-year time horizon if degradation follows the “no degradation” model (Air Force Center for Environmental Excellence and Groundwater Services, Inc., 1997). BIOSCREEN modeling results should be used cautiously because of the newly discovered free product in MW-3, and other remaining data gaps (Terracon, 2022a). In August 2022, Terracon returned to the site to collect groundwater samples. Free product was not detected in any of the wells prior to sampling. Analytical results revealed several petroleum constituents at concentrations exceeding the 2L standards (Terracon, 2022b). Acetone was detected in water supply well WSW-1 below the 2L Standard. Terracon returned to the site in November 2022 to collect soil vapor samples. Analytical results revealed 1,3-butadiene and ethylbenzene were detected in SV-01 at concentrations above the NCDEQ Residential Soil Gas Screening Levels (SGSLs), but below NCDEQ Non-Residential SGSLs. Other VOCs were detected in SV-01 below the NCDEQ Residential and Non-Residential SGSLs (Terracon, 2022c). C.4 Potential Receptors Three active water supply wells were identified within 1,000 feet of the source area. One of these wells, WSW-1, is situated within 500 feet of the source area. WSW-1 (hydraulically downgradient) and WSW-2 (hydraulically cross-gradient) are the closest Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 8 water supply wells to the source area and are situated approximately 300 feet northwest and 650 feet northeast of the source area, respectively. The site is served by WSW-1, which has been sampled periodically since at least July 2005 and has not contained detectable concentrations of petroleum constituents. According to Jared Byrd with Coleridge Volunteer Fire Department, WSW-1 also supplies water to the current Station 10 fire department and has historically supplied water to the site, a former school located on the same parcel as the current Station 10, and the former Station 10 located at 5085 Fork Creek Mill Creek Road. Municipal water was reportedly not available to the site and surrounding properties. According to aerial photographs and the applicable topographic map for the site, the nearest surface water feature is a pond located approximately 480 feet southwest of the site. Water supply well information is presented in Table 2 and well locations and nearby surface water features are depicted on Exhibit 3. Other ponds are present in Exhibit 3 that appear to be closer to the site than the pond to the east; however, those ponds are likely intermittent because they don’t appear in aerial photographs of the site. D.ASSESSMENT INFORMATION D.1 Assessment Activities Terracon mobilized to the site on February 7, 2023 to sample groundwater from four on-site monitoring wells (RW-1, and MW-1 through MW-3) and one water supply well (WSW-1) for analysis of VOCs. D.1.1 Free Product Evaluation Free product was not encountered in the monitoring wells during the February 2023 monitoring event; however, 0.02 feet of free product was detected in MW-3 during the April 2022 aquifer slug testing event. Free product has historically been observed in MW-1 in April 2019 and in MW-2 in January 2018. D.1.2 Groundwater Sampling Activities Prior to sample collection, Terracon gauged the depth to groundwater in the four on-site monitoring wells. Depth-to-groundwater measurements ranged from approximately 22.50 to 23.23 feet bTOC in February 2023. The approximate locations of the wells are shown on the Site Diagram (Exhibit 2). Groundwater elevations were calculated using the measured depths to groundwater and the TOC elevations that are based on an arbitrary datum of 100 feet with a benchmark. Current and historical Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 9 groundwater elevation measurements are provided in Table 3. Groundwater flow was estimated to be toward the northwest during the February 2023 gauging event, although the groundwater elevation for MW-1 was excluded for groundwater flow determination due to its difference in the screened interval compared to the other monitoring wells. The direction of groundwater flow is possibly not known with certainty due to the relatively close spacing of the monitoring wells. The direction also may be seasonably variable due to the location of the site near a groundwater divide. Groundwater elevations and groundwater elevation contours are depicted on Exhibit 4. Photographs and copies of field notes are provided in Appendix A. RW-1 and MW-1 through MW-3 were purged with a peristaltic pump using low-flow sampling techniques (i.e., less than 200 milliliters per minute) prior to sampling. Field parameters of pH, temperature, oxidation-reduction potential, dissolved oxygen, and conductivity were measured at each of the well locations. After stabilization of pH and conductivity, a groundwater sample was collected directly into laboratory-supplied containers at low-flow sampling rates. The groundwater samples were placed in laboratory-supplied glassware, labeled, and stored in an ice-packed cooler. The samples, along with chain-of-custody documentation, were delivered to Pace Analytical Services, LLC. in West Columbia, South Carolina for analysis of VOCs by United States Environmental Protection Agency Method 6200B including MTBE, ethylene dibromide, and IPE. D.2 Groundwater Analytical Results Based on the laboratory analytical report, benzene; 1,2-DCA; IPE; MTBE; naphthalene; n-propylbenzene; and total xylenes were detected in monitoring wells RW-1, MW-1, MW-2, and/or MW-3 at concentrations above the 2L standards. GCL exceedances were not identified in the monitoring wells; however, the concentrations of benzene detected at concentrations at least 10 times greater than the 2L standard in RW-1, MW-1, MW-2, and/or MW-3. Several petroleum constituents were detected above the laboratory reporting limit but below the 2L standards in the monitoring wells. A summary of groundwater analytical results is included on Table 4 and Exhibit 5. A copy of the laboratory analytical report is in Appendix B. Isoconcentration maps for benzene, 1,2-DCA, IPE, MTBE, and naphthalene are provided as Exhibits 6,7, 8, 9, and 10, respectively. These maps depict the approximate lateral extents of benzene and MTBE in the groundwater; however, the contaminants are not delineated in any direction. Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 10 E.CONCLUSIONS AND RECOMMENDATIONS Based on information obtained during the completion of groundwater monitoring activities, Terracon provides the following conclusions: n Groundwater depths in the monitoring wells ranged from 22.50 to 23.23 feet bTOC and groundwater is estimated to flow to the northwest. Based on the results from the August 2022 gauging event; however, the direction of groundwater flow was to the southeast. The direction of groundwater flow is possibly not known with certainty due to the relatively close spacing of the monitoring wells. The direction also may be seasonably variable due to the location of the site near to a groundwater divide. n Measurable thicknesses of free product were not detected in the monitoring wells during the February 2023 monitoring event; however, 0.02 feet of free product was detected in MW-3 during the April 2022 aquifer slug testing event. Free product thicknesses have also historically been observed in MW-1 and MW-2. n Benzene; 1,2-DCA; IPE; MTBE; naphthalene; n-propylbenzene; and total xylenes were detected in monitoring wells RW-1, MW-1, MW-2, and/or MW-3 at concentrations exceeding the 2L standards. n Exceedances of the North Carolina GCLs were not identified in the monitoring wells. However, benzene was detected in RW-1 in April 2019 and 1,2-DCA detected in MW-3 in April 2019 at concentrations that exceeded the GCLs. n The contaminant plume has not been delineated and may extend off the site. The contaminant plume is not delineated vertically, and vertical delineation may be necessary due to nearby water supply wells. n Three active water supply wells were identified within 1,000 feet of the source area. WSW-1 (hydraulically downgradient) and WSW-2 (hydraulically cross- gradient) are the closest water supply wells to the source area and are situated approximately 300 feet northwest and 650 feet northeast of the source area, respectively. The site is served by WSW-1, which has been sampled periodically since at least July 2005 and has not contained detectable concentrations of petroleum constituents. Municipal water is reportedly not available to the site and surrounding properties. n VOCs were not detected above the laboratory reporting limits in the sample collected from WSW-1 during this sampling event. Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 11 Based on the data presented in this Annual Monitoring Report, Terracon recommends the following activities be completed at the site due to the detection of free product in MW-3 in April 2022 and the February 2023 groundwater data. n Conduct a groundwater monitoring event in August 2023 that includes gauging and sampling monitoring wells (MW-1, MW-2, MW-3, and RW-1) and WSW-1. n If free product continues to be detected in the on-site monitoring wells and indications of a recent release are not identified, high-resolution site characterization could be performed consisting of the following: o Collecting additional data in the source area near monitoring wells MW-1, MW-2, and MW-3 using a Geoprobe® equipped with Optical Imaging Profiler (OIP) and/or Membrane Interface Probe (MIP). This investigation would further assess the distribution of residual petroleum hydrocarbons beneath the site. o Collecting soil core samples using a Macro-Core® sampler to determine whether the residual petroleum hydrocarbons in the vicinity of MW-1, MW-2, and MW-3 have similar composition, and thus are caused by the same release sources and thus continue to spread. o Using a Geoprobe® drill rig equipped with OIP/MIP detectors to assess the potential for dissolved and/or free-phase hydrocarbons to migrate to the southwest (toward the pond) and/or northwest (toward water supply well WSW-1). o Using a Geoprobe® drill rig to collect temporary grab samples using either a Screen Point Sampler or temporary monitoring wells. Former Erect Grocery Seagrove, North Carolina Terracon Project No. 70207596 Incident No. 6769 March 16, 2023 Explore with us 12 REFERENCES n Air Force Center for Environmental Excellence and Groundwater Services, Inc., 1997, BIOSCREEN Natural Attenuation Decision Support System, Version 1.4 Revisions, July. n Interstate Technology Regulatory Council, 2014, Petroleum Vapor Intrusion: Fundamentals of Screening, Investigation, and Management, October. n North Carolina Department of Environmental Quality (NCDEQ), 2022. 15A NCAC 02L .0202 Groundwater Standards. April 1. n NCDEQ, Division of Waste Management, 2023. Vapor Intrusion Screening Levels Guidance Document. January. n NCDEQ, 2021a. Corrective Action Guidelines for Petroleum and Hazardous Substance UST Releases / Petroleum Non-UST Releases, January 19. n NCDEQ, 2021b. Assessment Guidelines for Petroleum and Hazardous Substance UST Releases / Petroleum Non-UST Releases, January 19. n Pyramid Environmental & Engineering, P.C. (Pyramid), 2005. Limited Site Investigation, Erect Grocery. September 9. n Terracon Consultants, Inc. (Terracon), 2018. Federal/State-Lead Monitoring Report, Former Erect Grocery. March 29. n Terracon, 2019. Subsequent Monitoring Report, Former Erect Grocery. July 9. n Terracon, 2020. Subsequent Monitoring Report, Former Erect Grocery. April 27. n Terracon, 2021. Annual Monitoring Report, Former Erect Grocery. April 28. n Terracon, 2022a. Annual Monitoring Report, Former Erect Grocery. May 12. n Terracon, 2022b. Annual Monitoring Report, Former Erect Grocery. September 29. n Terracon, 2022c. Soil Vapor Sampling Event Letter Report, Former Erect Grocery. December 29. EXHIBITS N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprx0 2,000 4,0001,000 Feet Legend Site Boundary DATA SOURCES:USGS Topo tile base map service of The Nattional Map(TNM), data refreshed May 2020; Site Boundary basedon Randolph County Parcel Data. Topographic Vicinity Map EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date:March 2023 Site Diagram.mxd 70207596 1 ³ 1:24,000 MW-3 MW-2 MW-1 RW-1 Erect RdBen n e t t R d Fork C r e e k M i l l R d Spigot N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprx0 80 16040 Feet Legend ASTs in Secondary Containment Monitoring Well Propane AST Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Parcels Spigot Location DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Site Diagram EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date:February 2023 Site Diagram.mxd 70207596 2 1:960 SF-1 Erect RdBennett Rd Fork Cree k M i l l R d WSW-7 WSW-4 WSW-3 WSW-1 WSW-9 WSW-2 WSW-10 WSW-6 WSW-5 WSW-11 WSW-8 N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprx0 500 1,000250 Feet Legend Water Supply Well 500 FT Buffers Lake/Pond Intermittent Stream Site Boundary Randolph County Parcel Boundary DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Water Supply Well Location Map EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date:February 2023 ErectGroceryMaps.mxd 70207596 3 500' 1000' 1500' 500' 1000' 1500' 1:6,000 @A@A @A @A "! "! "!"! "!Erect RdFork C r e e k M i l l R d RW-1 76.57 MW-1 77.12MW-2 76.19 MW-3 76.92 Gravel Asphalt Teague Store Grass Wooded Asphalt Drive N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprx@A Monitoring Well "!ASTs in Secondary Containment "!Propane AST Groundwater Elevation Contour (inferred) Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Randolph County Parcel Boundary Groundwater Flow Direction DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Groundwater Elevation Map (February 2023)EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date:March 2023 GWelevation.mxd 70207596 4 ³ 0 40 8020 Feet 1:480 76.50 77.00 Note: RW-1 not used for groundwater elevation contouring. Erect RdFork C r e e k M i l l R d N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprxLegend Monitoring Well ASTs in Secondary Containment Propane AST Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Randolph County Parcel Boundary DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Groundwater Analytical Results Map (February 2023)EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF DRM Project No: Scale: Filename: Date:March 2023 GWanalytical.mxd 70207596 5 0 40 8020 Feet MW-3 Benzene - 2,200 1,2-Dichloroethane - 99 Diisopropyl ether - 2,400 Ethylbenzene - 280 Isopropylbenzne - 30 MTBE - 1,500 Naphthalene - 130 n-Propylbenzene - 57 Toluene - 53 1,3,5-Trimethylbenzene - 78 1,2,4-Trimethylbenzene - 210 Xylenes (Total) - 260 1:480 MW-1 Benzene - 510 n-Butylbenzene - 8.8 Diisopropyl ether - 15 Ethylbenzene - 37 Isopropylbenzne - 7.5 MTBE - 42 Naphthalene - 35 n-Propylbenzene - 18 Toluene - 18 1,3,5-Trimethylbenzene - 4.6 J 1,2,4-Trimethylbenzene - 15 Xylenes (Total) - 42 MW-2 Benzene - 130 n-Butylbenzene - 5.3 sec-Butylbenzene - 3.4 tert-Butlbenzene - 0.92 Chloroethane - 0.48 J 1,2-Dichloroethane - 4.3 Diisopropyl ether - 92 Ethylbenzene - 43 Isopropylbenzene - 24 p-Isopropyltoluene - 1.5 MTBE - 44 Naphthalene - 35 n-Propylbenzene - 26 Toluene - 7.9 1,3,5-Trimethylbenzene - 1.1 1,2,4-Trimethylbenzene - 1.4 Xylenes (Total) - 14.7 RW-1 Benzene - 4,500 1,2-Dichloroethane - 58 Diisopropyl ether - 970 Ethylbenzene - 590 Isopropylbenzene - 41 J MTBE - 1,200 Naphthalene - 180 n-Propylbenzene - 91 Toluene - 520 1,3,5-Trimethylbenzene - 110 1,2,4-Trimethylbenzene - 370 Xylenes (Total) - 1,810 Concentrations reported in micrograms per liter (µg/L).Bolded concentrations exceed the 2L Standard.J - estimated value below laboratory reporting limit and above method detection limit.MTBE - Methyl tert-Butyl Ether @A@A @A @A "! "! "!"! "!Erect RdFork C r e e k M i l l R d RW-1 4500 MW-1 510MW-2 130 MW-3 2200 N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprxLegend Benzene Isoconcentration Contour (inferred) @A Monitoring Well "!ASTs in Secondary Containment "!Propane AST Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Randolph County Parcel Boundary ED Water Supply Well DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Benzene Isoconcentration Map (February 2023)EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date:March 2023 BenzeneIso.mxd 70207596 6 ³ Concentrations reported in micrograms per liter (µg/L).2L Standard for benzene is 1 µg/L.Note: MW-1 not used for isocontouring.0 40 8020 Feet 1:480 1,000 µg/L1,000 µg/L100 µg/L @A@A @A @A "! "! "!"! "!Erect RdFork C r e e k M i l l R d RW-1 58 MW-1 <5.0MW-2 4.3 MW-3 99 N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprxLegend 1,2-Dichloroethane Isoconcentration Contour(inferred) @A Monitoring Well "!ASTs in Secondary Containment "!Propane AST Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Randolph County Parcel Boundary ED Water Supply Well DATA SOURCES: Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. 1,2-Dichloroethane Isoconcentration Map (February 2023)EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date:March 2023 1,2-Dichloroethane.mxd 70207596 7 ³ 0 40 8020 Feet 1:480 Concentrations reported in micrograms per liter (µg/L).2L Standard for 1,2-Dichloroethane is 0.4 µg/LNote: MW-1 not used for isocontouring40 µg/L40 µg/L0.4 µg/L @A@A @A @A "! "! "!"! "!Erect RdFork C r e e k M i l l R d RW-1 970 MW-1 15MW-2 92 MW-3 2,400 N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprxLegend Diisopropyl Ether Isoconcentration Contour(inferred) @A Monitoring Well "!ASTs in Secondary Containment "!Propane AST Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Randolph County Parcel Boundary ED Water Supply Well DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Diisopropyl Ether Isoconcentration Map (February 2023)EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date:March 2023 DIPEIso.mxd 70207596 8 ³ 0 40 8020 Feet 1:480 Concentrations reported in micrograms per liter (µg/L).2L Standard for diisopropyl ether is 70 µg/L.Note: MW-1 not used for isocontouring70 µg/L700 µg/L700 µg/L @A@A @A @A "! "! "!"! "!Erect RdFork C r e e k M i l l R d RW-1 1,200 MW-1 42MW-2 44 MW-3 1,500 N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprxLegend MTBE Isoconcentration Contour (inferred) @A Monitoring Well "!ASTs in Secondary Containment "!Propane AST Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Randolph County Parcel Boundary ED Water Supply Well DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Methyl tert-Butyl Ether (MTBE) Isoconcentration Map (February 2023)EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date: March 2023 MTBEIso.mxd 70207596 9 ³ 0 40 8020 Feet 1:480 Concentrations reported in micrograms per liter (µg/L).2L Standard for MTBE is 20 µg/L.Note: MW-1 not used for isocontouring200 µg/L200 µg/L20 µg/L @A@A @A @A "! "! "!"! "!Erect RdFork C r e e k M i l l R d RW-1 180 MW-1 32MW-2 35 MW-3 130 N:\GIS\2020\70207596_ErectRoad\Maps\TA-05\ErectGroceryMaps\ErectGroceryMaps.aprxLegend Naphthalene Isoconcentration Contour (inferred) @A Monitoring Well "!ASTs in Secondary Containment "!Propane AST Approximate Former UST Pit Location Concrete Pad Dispenser Island Off-Road Diesel Dispensers Site Boundary Randolph County Parcel Boundary ED Water Supply Well DATA SOURCES:Latest High-Resolution NC Statewide Orthoimagery, NCOneMap Server; 2018; Site Boundary based onRandolph County Parcel Data. Naphthalene Isoconcentration Map (February 2023)EXHIBIT NO. Former Erect Grocery (Incident No. 6769) 7816 Erect Road Seagrove, Randolph County, North Carolina2401 Brentwood Road, Suite 107 Raleigh, NC 27604 Phone: (919) 873-2211 Fax: (919) 873-9555 PM: Drawn By: Checked By: Approved By: ECD AIM JLF JLF Project No: Scale: Filename: Date: March 2023 MTBEIso.mxd 70207596 10 ³ 0 40 8020 Feet 1:480 Concentrations reported in micrograms per liter (µg/L).2L Standard for naphthalene is 6 µg/L.Note: MW-1 not used for isocontouring60 µg/L60 µg/L6 µg/L TABLES Table 1 Conceptual Site Model Erect Grocery (Incident #6769) 7816 Erect Road, Seagrove, North Carolina Terracon Project Number: 70207596 Three 2,000-gallon gasoline USTs and one 550-gallon diesel UST Unknown - soil borings around current on-site dispensers identified concentrations of petroleum compounds above STW MSCCs in soil. Unknown Unknown Residual Impacts Extent Contaminants of Concern Concentrations Soil Type Residual Impacts Yes Extent Vicinity of former UST basin and current dispenser island Contaminants of Concern Petroleum VOCs & SVOCs including benzene, naphthalene, and C9-C22 aromatics Concentrations Above STW MSCCS and C9-C22 above residential MSCCs in at least 1 location Soil Type Sandy silt Source to GW?Yes - soil concentrations greater than STW MSCCs NAPL Present? Residual or Mobile?Historically in MW-1, MW-2, and MW-3; last observed in April 2022 in MW-3. Depth to Groundwater 15 to 20 feet below land surface Hydraulic Conductivity Unknown Delineated? If so, extent?Not delineated in all direction or vertically Extend Off-Site?Likely extends off-site to south and east Contaminants of Concern Benzene, 1,2-DCA, IPE, MTBE, naphthalene, and other petroleum compounds Concentrations Benzene (RW-1) and 1,2-DCA (MW-3) historically above GCL, other VOCs (IPE, MTBE, and naphthalene) >10x the 2L Standard Trends Concentrations slightly increasing or generally stable since 2010 Horizontal Gradient Approximately 0.02 ft/ft Vertical Gradient Unknown Depth to Groundwater Delineated? If so, extent? Extends Off-Site? Hydraulic Conductivity Contaminants of Concern Concentrations Trends Horizontal Gradient Approximately 480 feet southwest Lateral Distance from Impacts to Building 10 feet - contaminant plume likely extends beneath building Depth to GW 15 to 20 feet below land surface Precluding Factors Present? Specify.1,2-DCA (lead scavenger) detections in groundwater GW Concentrations > VISLs?Yes Exterior Soil Gas Concentrations >VISLs?Concentrations below Non-Residential SGSLs in sample SV-01 collected in November 2022. Sub-Slab/Crawlspace Concentrations > VISLs? Indoor Air Concentrations > VISLs? Is the VI Pathway Complete? Soil over excavation during UST closure in 1990. Confirmation soil samples indicated TPH concentration above NCDEQ Action Levels. 2 MMPE events - recovered approximately 4.66 gallons of total VOC emissions Number within 250 feet None Number within 250-500 feet 1 active (WSW-1) - supplies water to site and Coleridge Fire Department (7718 Erect Road) Number within 500-1,000 feet 2 active (WSW-2 and WSW-6) Approximately 480 feet southwest On-site store employees Non-Residential - currently retail (Teague Store) Concentrations above STW and Residential MSCCs - close with deed restriction NAPL and/or >GCLs Residual NAPL present in MW-3 (April 2022) and historically in MW-1 and MW-2. GCL exceedances historically present; reduce concentrations (potentially via excavation or active remediation) Water Supply Wells Contaminant fate and transport modeling indicates WSW-1 will not be impacted on a 30-year timeframe. Intermiediate risk based on distance <500 ft (NCDEQ UST Guidance) Further evaluation of VI Pathway necessary Notes: MSCC: NCDEQ maximum soil contaminant concentrations UST: underground storage tank STW: soil-to-groundwater NA: not applicable 2L Standard: 15A NCAC 2L groundwater quality standards VI: Vapor Intrusion GCL: NCDEQ gross contamination levels GW: groundwater VISL: NCDEQ vapor intrusion screening levels VOC: volatile organic compound NAPL: non-aqueous phase liquid SVOC: semi-volatile organic compound NCDEQ UST Guidance: NCDEQ UST SectionGuidelines for Assessment BTEX: benzene, toluene, ethylbenzene, xylenes and Corrective Action for UST Releases DCA: dichloroethane SGSL: Soil gas screen level TPH: Total petroleum hydrocarbons Not Sampled ReceptorsWSWsSurface Water (Modeling/Screening or Empirical) Vapor Intrusion (Modeling/Screening or Empirical)Closure PathwayCurrent/Proposed Property Use Soil GWSurface Water Vapor IntrusionSoil VaporScreeningAssessmentRemediationSoil (Type, When, Successful?) Groundwater (Type, When, Successful?)SurfaceWaterDistance from Source Contaminants of Concern Not SampledConcentrations Groundwater or Surficial Source? Source Areas UST(s) Dispensers Piping Other SubsurfaceGroundwaterSurficialNot Sampled BedrockSoilPhysiographic Province SurficialNot Sampled Table 2 Water Supply Well Information Erect Grocery (Incident #6769) 7816 Erect Road, Seagrove, North Carolina Terracon Project Number: 70207596 WSW-1 Coleridge Fire Department 4495 NC HWY 22 South Ramseur, NC 27316 7718 Erect Road Seagrove, NC 27341 300 feet / Northwest Potable 8605397302 Supplies water to site WSW-2 Charles & Mary Jane Teague 7711 Erect Road Seagrove, NC 27341 7815 Erect Road Seagrove, NC 27341 650 feet / Northeast Potable 8605491470 WSW-3 George Teague 4951 Fork Creek Mill Road Seagrove, NC 27341 4951 Fork Creek Mill Road Seagrove, NC 27341 1,390 feet / West-Northwest Potable 8605296375 WSW-4 George Teague 4951 Fork Creek Mill Road Seagrove, NC 27341 4951 Fork Creek Mill Road Seagrove, NC 27341 1,450 feet / West-Northwest Potable 8605296375 WSW-5 Jeffery & Leah Sugg PO Box 4730 Asheboro, NC 27240 7978 Erect Road Seagrove, NC 27341 975 feet / South-Southwest Potable 8605385162 WSW-6 Jeffery & Leah Sugg PO Box 4730 Asheboro, NC 27240 7978 Erect Road Seagrove, NC 27341 1,050 feet / South-Southwest Potable 8605385162 WSW-7 Shirley King Gillispie Life Estate 4968 Fork Creek Mill Road Seagrove, NC 27341 4968 Fork Creek Mill Road Seagrove, NC 27341 1,225 feet / West Potable 8605286936 WSW-8 Merritt E Teague 7630 Erect Road Seagrove, NC 27341 7630 Erect Road Seagrove, NC 27341 1,300 feet / North Potable 8606305285 WSW-9 Derek & Amanda Johnson 7660 Erect Road Seagrove, NC 27341 7660 Erect Road Seagrove, NC 27341 1,180 feet / North-Northwest Potable 860595980 WSW-10 Charles and Harold Teague 7711 Erect Road Seagrove, NC 27341 No address 1,020 feet / North-Northeast Potable 8605691794 WSW-11 Jeffrey Sugg & Kathy Fleetwood (Co-Trustees) PO Box 4730 Asheboro, NC 27204 8010 Erect Road Seagrove, NC 27341 1,210 feet / South-Southwest Potable 8605379465 Well Status/Use Parcel ID NotesWell No.Property Owner Mailing Address Property Address Distance/Directions from source area Table 3 Monitoring Well Construction Information and Historical Groundwater Elevations Erect Grocery (Incident #6769) 7816 Erect Road, Seagrove, North Carolina Terracon Project Number: 70207596 Well ID Date Water Level Measured Well Casing Depth (ft. BGS) Screened Interval (x to y ft. BGS) Bottom of Well (ft. BGS) Top of Casing Elevation (ft.) Depth to Water from Top of Casing (ft.) Free Product Thickness (ft.) Groundwater Elevation (ft.)Comments 07/20/05 21.25 0.11 78.45 01/25/18 32.23 0.51 67.76 03/25/19 19.10 0.19 80.66 04/16/19 16.30 -83.32 02/03/20 18.40 -81.22 03/19/21 14.75 -84.87 03/22/22 20.24 -79.38 04/05/22 19.16 -80.46 08/16/22 24.05 -75.57 02/07/23 22.50 -77.12 01/25/18 31.15 0.30 68.13 04/16/19 16.92 -82.36 02/03/20 19.14 -80.14 03/19/21 16.23 -83.05 03/22/22 19.19 -80.09 04/05/22 19.04 -80.24 08/16/22 24.15 -75.13 02/07/23 23.09 -76.19 01/25/18 31.10 -68.90 04/16/19 15.73 -84.27 02/03/20 19.43 -80.57 03/19/21 16.60 -83.40 03/22/22 19.24 -80.76 04/05/22 19.48 0.02 80.53 08/16/22 25.41 -74.59 02/07/23 23.08 -76.92 03/25/19 18.31 -81.49 04/16/19 15.84 -83.96 02/03/20 19.01 -80.79 03/19/21 17.24 -82.56 03/22/22 19.20 -80.60 04/05/22 19.33 -80.47 08/16/22 24.55 -75.25 02/07/23 23.23 -76.57 Notes: "-" indicates a measurable amount of free product was not detected Groundwater elevations adjusted for measurable free product by using the following calculation: (TOC Elevation - Depth to water) + (FP thickness * 0.729) 0.729 is the specific gravity for automotive gasoline Elevations based on an arbitrary datum of 100.00 feet with a benchmark. MW-2 MW-3 99.62 2-inch Type II 30.0 30-50 15-50 50.0 RW-1 15.0 50.0 99.28 2-inch Type II 100.00 30.0 30-50 50.0 99.80 2-inch Type II 4-inch Extraction Well 30.0 30-45 45.0 MW-1 Table 4 Summary of Groundwater Analytical Results Erect Grocery (Incident #6769) 7816 Erect Road, Seagrove, North Carolina Terracon Project Number: 70207596 Well/Sample I.D. Date Collected (mm/dd/yy) 6,000 1 70 70 70 3,000 3 0.02 0.4 70 600 70 25 40 100 20 6 70 600 400 400 500 6,000,000 5,000 5,900 8,800 14,750 NE 3,000 50 400 70,000 80,000 30,500 11,700 40,000 100,000 20,000 6,000 26,100 260,000 24,100 28,500 50,000 NE 6.9 NE NE NE 7,700 220 0.77 9.8 5,900 15 750 NE 6,900 470,000 2,000 20 2,000 16,000 150 210 320 7/20/2005 -1,170 ND 5.42 ND 3.48 -2.82 79.9 279 107 38 3.9 ND ND 820 46.6 86 1,520 26.8 212 972 1/25/2018 4/16/2019 -3,900 22 10 <0.88 <2.2 -<0.51 37 480 940 48 6.6 <0.065 56 1,300 490 150 3,500 360 1,600 5,500 2/3/2020 -690 5.0 2.6 J <1.7 <3.5 -<1.9 49 620 70 13 <2.0 <15 <17 1,000 74 21 190 45 170 530 3/19/2021 -4,800 <25 <25 <25 <25 -<25 51 600 910 51 <25 --1,100 270 110 2,300 210 840 3,740 3/22/2022 -1,530 <20.0 <20.0 <20.0 <100 -<20.0 <20.0 86.4 120 <20.0 <20.0 --220 115 53.1 49.9 36.8 215 209 8/16/2022 <200 2,200 17 <10 <10 <10 <10 <10 21 250 550 47 <10 <200 <200 330 150 110 390 71 300 1,220 2/7/2023 <100 510 8.8 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 15 37 7.5 <5.0 <100 <100 42 32 18 18 4.6 J 15 42 1/25/2018 -530 3.1 1.9 1.7 <0.50 -<0.50 37 750 60 7.5 1.8 ND ND 630 32 13 64 11 44 160 4/16/2019 -840 11 6.0 1.5 <2.2 -<0.051 33 430 81 42 4.1 <0.065 3.5 160 77 36 44 19 76 130 2/3/2020 -130 4.6 2.8 0.98 <0.35 -<0.19 6.3 110 2.6 13 3.5 <1.5 <1.7 23 22 8.9 10 16 57 91.1 3/19/2021 -140 3.0 <2.5 <2.5 <2.5 -<2.5 13 210 16 10 <2.5 --140 22 10 4.4 <2.5 3.3 8.0 3/22/2022 -151 5.3 3.92 <1.00 <5.00 -<1.00 5.88 145 89.7 28.8 1.93 --90.5 55.4 40.4 11.2 1.81 5.61 32.4 8/16/2022 33 190 4.1 2.9 0.78 0.41 J 0.71 <0.50 5.9 120 55 23 1.1 <10 <10 74 27 28 9.9 0.74 1.3 15.7 2/7/2023 <10 130 5.3 3.4 0.92 0.48 J <10 <10 4.3 92 43 24 1.5 <10 <10 44 35 26 7.9 1.1 1.4 14.7 1/25/2018 -4,800 40 20 16 <0.50 -<0.50 270 4,400 990 74 20 ND ND 4,300 460 190 910 290 1,100 4,600 4/16/2019 -2,500 11 8 <0.88 <2.2 -<0.51 400 5,400 210 36 7.7 <0.65 56 4,200 260 66 130 220 680 1,500 2/3/2020 -1,600 12 J <8.0 <8.5 <18 -<9.5 240 3,600 380 42 <10 <76 <84 2,500 330 74 150 190 520 1,390 3/19/2021 -3,300 <25 <25 <25 <25 -<25 180 2,600 400 44 <25 --1,300 190 87 100 150 520 784 3/22/2022 -2,440 <100 <100 <100 <500 -<100 <100 2,360 575 <100 <100 --1,300 <500 154 138 198 579 932 8/16/2022 <200 2,700 8.2 J <10 <10 <10 <10 <10 100 1,500 340 32 <10 <200 <200 760 130 63 97 92 290 447 2/7/2023 <500 2,200 <25 <25 <25 <25 <25 <25 99 2,400 280 30 <25 <500 <500 1,500 130 57 53 78 210 260 4/16/2019 -7,500 12 7.2 <0.88 <2.2 -3.1 J 76 910 1,400 55 4.6 J 13 74 1,700 420 140 6,900 260 1,200 6,800 2/3/2020 3/19/2021 -2,500 <25 <25 <25 <25 -<25 44 500 530 35 <25 --1,100 180 88 130 140 560 1,581 3/22/2022 8/16/2022 <200 2,200 9.7 J <10 <10 <10 <10 <10 27 370 250 26 <10 <200 <200 940 120 56 64 24 130 260 2/7/2023 <1000 4,500 <50 <50 <50 <50 <50 <50 58 970 590 41 J <50 <1000 <1000 1,200 180 91 520 110 370 1,810 2/3/2020 -<0.18 <2.1 <0.16 <0.17 <0.35 -<0.19 <0.41 <0.17 <0.13 <0.17 <0.20 <1.5 <1.7 <0.25 <0.31 <0.13 <0.14 <0.14 <0.18 <0.17 3/19/2021 8/16/2022 8.6 J <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 2/7/2023 <10 <0.50 <0.50 <0.50 <0.50 <0.50 --<0.50 <0.50 <0.50 <0.50 <0.50 <10 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 WSW-2 3/19/2021 -<0.50 <0.50 <0.50 <0.50 <0.50 -<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 --2.1 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 Notes: Results in micrograms per liter (µg/L).J - estimated value below laboratory reporting limit and above method detection limit. Petroleum compounds detected in one or more samples are shown.ND - Not detected. Gray shading denotes concentrations above 15A NCAC 2L groundwater standard (2L standard).- : Not analyzed or detected Yellow shading denotes concentrations above Gross Contamination Levels (GCLs).Methyl Isobutyl KetoneDiisopropyl ether (IPE)Methyl Butyl KetoneAnalytical Method Contaminant of Concern→p-IsopropyltolueneBenzeneEthylbenzeneIsopropylbenzenesec-Butylbenzenen-Butylbenzene1,2-Dichloroethane1,2-Dibromoethane(EDB)tert-ButylbenzeneChloroethaneVOCs by EPA Method 6200B including MTBE, IPE, and EDB Xylenes (Total)1,3,5-TrimethylbenzeneTolueneNaphthaleneMethyl tert-Butyl Ether(MTBE)1,2,4-TrimethylbenzeneWSW-1 n-PropylbenzeneMW-1 RW-1 MW-3 MW-2 Not Sampled - Access Not Granted Not SampledAcetoneChloromethaneNot Sampled Not Sampled - Free Product Detected 2L Standard (µg/L) GCL (µg/L) Non-Residential GW-VISLs (µg/L)NE APPENDIX A PHOTOGRAPHS AND FIELD NOTES Groundwater Sampling Event Erect Grocery (Incident No. 6769) ■ Seagrove, North Carolina Photos Taken: February 7, 2023 ■ Terracon Project No. 70207596 Photo #1 View of the on-site Teague Store (7816 Erect Rd); facing north. Photo #2 View MW-1; facing north. Groundwater Sampling Event Erect Grocery (Incident No. 6769) ■ Seagrove, North Carolina Photos Taken: February 7, 2023 ■ Terracon Project No. 70207596 Photo #3 View MW-2; facing west. Photo #4 View MW-3; facing northeast. Groundwater Sampling Event Erect Grocery (Incident No. 6769) ■ Seagrove, North Carolina Photos Taken: February 7, 2023 ■ Terracon Project No. 70207596 Photo #5 View RW-1; facing west. Photo # View of spigot off main site building, facing north. APPENDIX B LABORATORY ANALYTICAL RESULTS AND CHAIN-OF-CUSTODY FORM The electronic signature above is the equivalent of a handwritten signature. This report shall not be reproduced,except in its entirety,without the written approval of Pace Analytical Services,LLC. Pace Analytical Services,LLC (formerly Shealy Environmental Services,Inc.) 106 Vantage Point Drive West Columbia,SC 29172 Tel:803-791-9700 Fax:803-791-9111 www.pacelabs.com Report of Analysis Terracon Consultants,Inc. 2401 Brentwood Road Suite 107 I Raleigh,NC 27604 Attention:Ethan Dinwiddie Project Name:Erect Grocery Project Number:70207596 Lot Number:YB08028 Date Completed:02/23/2023 02/23/2023 9:40 PM Approved and released by: Project Manager II:Cathy S.Dover Page 1 of 41 PACE ANALYTICAL SERVICES,LLC SC DHEC No:32010001 NELAC No:E87653 NC DENR No:329 NC Field Parameters No:5639 Pace Analytical Services,LLC (formerly Shealy Environmetal Services,Inc.) 106 Vantage Point Drive West Columbia,SC 29172 (803)791-9700 Fax (803)791-9111 www.pacelabs.com Case Narrative Terracon Consultants,Inc. Lot Number:YB08028 This Report of Analysis contains the analytical result(s)for the sample(s)listed on the Sample Summary following this Case Narrative.The sample receiving date is documented in the header information associated with each sample. All results listed in this report relate only to the samples that are contained within this report.Where sampling is conducted by the client,results relate to the accuracy of the information provided,and as the samples are received. Sample receipt,sample analysis,and data review have been performed in accordance with the most current approved The NELAC Institute (TNI)standards,the Pace Analytical Services,LLC ("Pace") Laboratory Quality Manual,standard operating procedures (SOPs),and Pace policies.Any exceptions to the TNI standards,the Laboratory Quality Manual,SOPs or policies are qualified on the results page or discussed below. Pace is a TNI accredited laboratory;however,the following analyses are currently not listed on our TNI scope of accreditation:Drinking Water:VOC (excluding BTEX,MTBE,Naphthalene,&1,2- dichloroethane)EPA 524.2,E.coli and Total coliforms SM 9223 B-2004,Solid Chemical Material:TOC Walkley-Black,Biological Tissue:All,Non-Potable Water:SGT-HEM EPA 1664B,Silica EPA 200.7, Boron,Calcium,Silicon,Strontium EPA 200.8,Bicarbonate,Carbonate,and Hydroxide Alkalinity SM 2320 B-2011,SM 9221 C E-2006 &SM 9222D-2006,Strontium SW-846 6010D,VOC SM 6200 B-2011,Fecal Coliform Colilert-18. VOA 6200B The laboratory control sample (LCS)for analytical batch 68047 exceeded acceptance criteria for the following analytes:Dichlorodifluoromethane,Chloromethane,Acetone.No more unused vials available for re-analysis for sample YB08028-003 (MW-2).Sample YB08028-006 (WSW-1)was reanalyzed for Run 2 one day outside holding time and both runs have been reported.These analytes for Run 1 were biased high and were not detected in the associated samples. YB08028-003 (MW-2)(Run 2)(Analysis Batch 68047)North Carolina UST 6200B List YB08028-006 (WSW-1)(Run 1)(Analysis Batch 68047)North Carolina UST 6200B List The method blank associated with batch 68276 had Hexachlorobutadiene detected at a concentration that was above the LOQ. The sample (YB08028-006)associated with this method blank was non-detect for Hexachlorobutadiene;therefore the data has been reported. The method blank associated with batch 68276 had Naphthalene detected at a concentration that was above the DL,but below the LOQ. The sample (YB08028-006)associated with this method blank was non-detect for Naphthalene;therefore the data has been reported. The MSD for batch 67751 and parent sample YB08028-002 (MW-1),recovered marginally outside the upper control limit.The associated LCS and MS passed acceptance criteria. If you have any questions regarding this report,please contact the Pace Project Manager listed on the cover page. Page 2 of 41 PACE ANALYTICAL SERVICES, LLC Sample Summary Terracon Consultants, Inc. Lot Number: YB08028 Project Name: Erect Grocery Project Number: 70207596 Sample Number Sample ID Matrix Date Sampled Date Received 001 02/07/2023 1000RW-1 Aqueous 02/08/2023 002 02/07/2023 1030MW-1 Aqueous 02/08/2023 003 02/07/2023 1105MW-2 Aqueous 02/08/2023 004 02/07/2023 1135MW-3 Aqueous 02/08/2023 005 02/07/2023 1145FB-01 Aqueous 02/08/2023 006 02/07/2023 1200WSW-1 Aqueous 02/08/2023 007 02/07/2023TB-01 Aqueous 02/08/2023 (7 samples) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 3 of 41 PACE ANALYTICAL SERVICES, LLC Detection Summary Terracon Consultants, Inc. Lot Number: YB08028 Project Name: Erect Grocery Project Number: 70207596 Sample Sample ID Matrix Parameter Method Result Q Units Page 001 RW-1 Aqueous Benzene SM 6200B-4500 ug/L 6 001 RW-1 Aqueous 1,2-Dichloroethane SM 6200B-58 ug/L 6 001 RW-1 Aqueous Diisopropyl ether (IPE)SM 6200B-970 ug/L 6 001 RW-1 Aqueous Ethylbenzene SM 6200B-590 ug/L 6 001 RW-1 Aqueous Isopropylbenzene SM 6200B-41 J ug/L 6 001 RW-1 Aqueous Methyl tertiary butyl ether SM 6200B-1200 ug/L 6 001 RW-1 Aqueous Naphthalene SM 6200B-180 ug/L 7 001 RW-1 Aqueous n-Propylbenzene SM 6200B-91 ug/L 7 001 RW-1 Aqueous Toluene SM 6200B-520 ug/L 7 001 RW-1 Aqueous 1,3,5-Trimethylbenzene SM 6200B-110 ug/L 7 001 RW-1 Aqueous 1,2,4-Trimethylbenzene SM 6200B-370 ug/L 7 001 RW-1 Aqueous m+p - Xylenes SM 6200B-1500 ug/L 7 001 RW-1 Aqueous o - Xylenes SM 6200B-310 ug/L 7 002 MW-1 Aqueous Benzene SM 6200B-510 ug/L 8 002 MW-1 Aqueous n-Butylbenzene SM 6200B-8.8 ug/L 8 002 MW-1 Aqueous Diisopropyl ether (IPE)SM 6200B-15 ug/L 8 002 MW-1 Aqueous Ethylbenzene SM 6200B-37 ug/L 8 002 MW-1 Aqueous Isopropylbenzene SM 6200B-7.5 ug/L 8 002 MW-1 Aqueous Methyl tertiary butyl ether SM 6200B-42 ug/L 8 002 MW-1 Aqueous Naphthalene SM 6200B-32 ug/L 9 002 MW-1 Aqueous n-Propylbenzene SM 6200B-18 ug/L 9 002 MW-1 Aqueous Toluene SM 6200B-18 ug/L 9 002 MW-1 Aqueous 1,3,5-Trimethylbenzene SM 6200B-4.6 J ug/L 9 002 MW-1 Aqueous 1,2,4-Trimethylbenzene SM 6200B-15 ug/L 9 002 MW-1 Aqueous m+p - Xylenes SM 6200B-42 ug/L 9 003 MW-2 Aqueous Benzene SM 6200B-130 ug/L 10 003 MW-2 Aqueous n-Butylbenzene SM 6200B-5.3 ug/L 10 003 MW-2 Aqueous sec-Butylbenzene SM 6200B-3.4 ug/L 10 003 MW-2 Aqueous tert-Butylbenzene SM 6200B-0.92 ug/L 10 003 MW-2 Aqueous Chloroethane SM 6200B-0.48 J ug/L 10 003 MW-2 Aqueous 1,2-Dichloroethane SM 6200B-4.3 ug/L 10 003 MW-2 Aqueous Diisopropyl ether (IPE)SM 6200B-92 ug/L 10 003 MW-2 Aqueous Ethylbenzene SM 6200B-43 ug/L 10 003 MW-2 Aqueous Isopropylbenzene SM 6200B-24 ug/L 10 003 MW-2 Aqueous p-Isopropyltoluene (p-SM 6200B-1.5 ug/L 10 003 MW-2 Aqueous Methyl tertiary butyl ether SM 6200B-44 ug/L 10 003 MW-2 Aqueous Naphthalene SM 6200B-35 ug/L 11 003 MW-2 Aqueous n-Propylbenzene SM 6200B-26 ug/L 11 003 MW-2 Aqueous Toluene SM 6200B-7.9 ug/L 11 003 MW-2 Aqueous 1,3,5-Trimethylbenzene SM 6200B-1.1 ug/L 11 003 MW-2 Aqueous 1,2,4-Trimethylbenzene SM 6200B-1.4 ug/L 11 003 MW-2 Aqueous m+p - Xylenes SM 6200B-13 ug/L 11 003 MW-2 Aqueous o - Xylenes SM 6200B-1.7 ug/L 11 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 4 of 41 Detection Summary (Continued) Lot Number: YB08028 Sample Sample ID Matrix Parameter Method Result Q Units Page 004 MW-3 Aqueous Benzene SM 6200B-2200 ug/L 12 004 MW-3 Aqueous 1,2-Dichloroethane SM 6200B-99 ug/L 12 004 MW-3 Aqueous Diisopropyl ether (IPE)SM 6200B-2400 ug/L 12 004 MW-3 Aqueous Ethylbenzene SM 6200B-280 ug/L 12 004 MW-3 Aqueous Isopropylbenzene SM 6200B-30 ug/L 12 004 MW-3 Aqueous Methyl tertiary butyl ether SM 6200B-1500 ug/L 12 004 MW-3 Aqueous Naphthalene SM 6200B-130 ug/L 13 004 MW-3 Aqueous n-Propylbenzene SM 6200B-57 ug/L 13 004 MW-3 Aqueous Toluene SM 6200B-53 ug/L 13 004 MW-3 Aqueous 1,3,5-Trimethylbenzene SM 6200B-78 ug/L 13 004 MW-3 Aqueous 1,2,4-Trimethylbenzene SM 6200B-210 ug/L 13 004 MW-3 Aqueous m+p - Xylenes SM 6200B-260 ug/L 13 005 FB-01 Aqueous Acetone SM 6200B-14 ug/L 14 005 FB-01 Aqueous Methylene chloride SM 6200B-2.5 ug/L 15 (57 detections) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 5 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. RW-1 YB08028-001 02/07/2023 1000 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 100 02/16/2023 1934 JWO 67751 2 SM 6200B-SM 6200B-2011 100 02/20/2023 0223 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Acetone 67-64-1 SM 6200B-2011 ND 1ug/L4001000 Benzene 71-43-2 SM 6200B-2011 4500 1ug/L4050 Bromobenzene 108-86-1 SM 6200B-2011 ND 1ug/L4050 Bromochloromethane 74-97-5 SM 6200B-2011 ND 1ug/L4050 Bromodichloromethane 75-27-4 SM 6200B-2011 ND 1ug/L4050 Bromoform 75-25-2 SM 6200B-2011 ND 1ug/L4050 Bromomethane (Methyl bromide)74-83-9 SM 6200B-2011 ND 1ug/L4050 2-Butanone (MEK)78-93-3 SM 6200B-2011 ND 1ug/L2001000 n-Butylbenzene 104-51-8 SM 6200B-2011 ND 1ug/L4050 sec-Butylbenzene 135-98-8 SM 6200B-2011 ND 1ug/L4050 tert-Butylbenzene 98-06-6 SM 6200B-2011 ND 1ug/L4050 Carbon tetrachloride 56-23-5 SM 6200B-2011 ND 1ug/L4050 Chlorobenzene 108-90-7 SM 6200B-2011 ND 1ug/L4050 Chloroethane 75-00-3 SM 6200B-2011 ND 1ug/L4050 Chloroform 67-66-3 SM 6200B-2011 ND 1ug/L4050 Chloromethane (Methyl chloride)74-87-3 SM 6200B-2011 ND 2ug/L4050 2-Chlorotoluene 95-49-8 SM 6200B-2011 ND 1ug/L4050 4-Chlorotoluene 106-43-4 SM 6200B-2011 ND 1ug/L4050 Dibromochloromethane 124-48-1 SM 6200B-2011 ND 1ug/L4050 1,2-Dibromoethane (EDB)106-93-4 SM 6200B-2011 ND 1ug/L4050 Dibromomethane (Methylene bromide)74-95-3 SM 6200B-2011 ND 1ug/L4050 1,2-Dichlorobenzene 95-50-1 SM 6200B-2011 ND 1ug/L4050 1,3-Dichlorobenzene 541-73-1 SM 6200B-2011 ND 1ug/L4050 1,4-Dichlorobenzene 106-46-7 SM 6200B-2011 ND 1ug/L4050 Dichlorodifluoromethane 75-71-8 SM 6200B-2011 ND 2ug/L4050 1,1-Dichloroethane 75-34-3 SM 6200B-2011 ND 1ug/L4050 1,2-Dichloroethane 107-06-2 SM 6200B-2011 58 1ug/L4050 1,1-Dichloroethene 75-35-4 SM 6200B-2011 ND 1ug/L4050 cis-1,2-Dichloroethene 156-59-2 SM 6200B-2011 ND 1ug/L4050 trans-1,2-Dichloroethene 156-60-5 SM 6200B-2011 ND 1ug/L4050 1,2-Dichloropropane 78-87-5 SM 6200B-2011 ND 1ug/L4050 1,3-Dichloropropane 142-28-9 SM 6200B-2011 ND 1ug/L4050 2,2-Dichloropropane 594-20-7 SM 6200B-2011 ND 1ug/L4050 1,1-Dichloropropene 563-58-6 SM 6200B-2011 ND 1ug/L4050 cis-1,3-Dichloropropene 10061-01-5 SM 6200B-2011 ND 1ug/L4050 trans-1,3-Dichloropropene 10061-02-6 SM 6200B-2011 ND 1ug/L4050 Diisopropyl ether (IPE)108-20-3 SM 6200B-2011 970 1ug/L4050 Ethylbenzene 100-41-4 SM 6200B-2011 590 1ug/L4050 Hexachlorobutadiene 87-68-3 SM 6200B-2011 ND 1ug/L4050 2-Hexanone 591-78-6 SM 6200B-2011 ND 1ug/L2001000 Isopropylbenzene (Cumene)98-82-8 SM 6200B-2011 41 J 1ug/L4050 p-Isopropyltoluene (p-Cymene)99-87-6 SM 6200B-2011 ND 1ug/L4050 Methyl tertiary butyl ether (MTBE)1634-04-4 SM 6200B-2011 1200 1ug/L4050 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 6 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. RW-1 YB08028-001 02/07/2023 1000 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 100 02/16/2023 1934 JWO 67751 2 SM 6200B-SM 6200B-2011 100 02/20/2023 0223 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL 4-Methyl-2-pentanone 108-10-1 SM 6200B-2011 ND 1ug/L2001000 Methylene chloride 75-09-2 SM 6200B-2011 ND 1ug/L4050 Naphthalene 91-20-3 SM 6200B-2011 180 1ug/L4050 n-Propylbenzene 103-65-1 SM 6200B-2011 91 1ug/L4050 Styrene 100-42-5 SM 6200B-2011 ND 1ug/L4050 1,1,1,2-Tetrachloroethane 630-20-6 SM 6200B-2011 ND 1ug/L4050 1,1,2,2-Tetrachloroethane 79-34-5 SM 6200B-2011 ND 1ug/L4050 Tetrachloroethene 127-18-4 SM 6200B-2011 ND 1ug/L4050 Toluene 108-88-3 SM 6200B-2011 520 1ug/L4050 1,1,2-Trichloro-1,2,2-Trifluoroethane 76-13-1 SM 6200B-2011 ND 1ug/L4050 1,2,3-Trichlorobenzene 87-61-6 SM 6200B-2011 ND 1ug/L4050 1,2,4-Trichlorobenzene 120-82-1 SM 6200B-2011 ND 1ug/L4050 1,1,1-Trichloroethane 71-55-6 SM 6200B-2011 ND 1ug/L4050 1,1,2-Trichloroethane 79-00-5 SM 6200B-2011 ND 1ug/L4050 Trichloroethene 79-01-6 SM 6200B-2011 ND 1ug/L4050 Trichlorofluoromethane 75-69-4 SM 6200B-2011 ND 1ug/L4050 1,2,3-Trichloropropane 96-18-4 SM 6200B-2011 ND 1ug/L4050 1,3,5-Trimethylbenzene (Mesitylene)108-67-8 SM 6200B-2011 110 1ug/L4050 1,2,4-Trimethylbenzene 95-63-6 SM 6200B-2011 370 1ug/L4050 Vinyl chloride 75-01-4 SM 6200B-2011 ND 2ug/L4050 m+p - Xylenes 179601-23-1 SM 6200B-2011 1500 1ug/L4050 o - Xylenes 95-47-6 SM 6200B-2011 310 1ug/L4050 AcceptanceAcceptanceRun 2Run 1 Surrogate Q % Recovery Limits % Recovery LimitsQ 1,2-Dichloroethane-d4 100 70-130 113 70-130 Bromofluorobenzene 101 70-130 103 70-130 Toluene-d8 100 70-130 107 70-130 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 7 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. MW-1 YB08028-002 02/07/2023 1030 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 10 02/16/2023 1826 JWO 67751 2 SM 6200B-SM 6200B-2011 10 02/20/2023 0134 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Acetone 67-64-1 SM 6200B-2011 ND 1ug/L40100 Benzene 71-43-2 SM 6200B-2011 510 1ug/L4.05.0 Bromobenzene 108-86-1 SM 6200B-2011 ND 1ug/L4.05.0 Bromochloromethane 74-97-5 SM 6200B-2011 ND 1ug/L4.05.0 Bromodichloromethane 75-27-4 SM 6200B-2011 ND 1ug/L4.05.0 Bromoform 75-25-2 SM 6200B-2011 ND 1ug/L4.05.0 Bromomethane (Methyl bromide)74-83-9 SM 6200B-2011 ND S 1ug/L4.05.0 2-Butanone (MEK)78-93-3 SM 6200B-2011 ND 1ug/L20100 n-Butylbenzene 104-51-8 SM 6200B-2011 8.8 1ug/L4.05.0 sec-Butylbenzene 135-98-8 SM 6200B-2011 ND 1ug/L4.05.0 tert-Butylbenzene 98-06-6 SM 6200B-2011 ND 1ug/L4.05.0 Carbon tetrachloride 56-23-5 SM 6200B-2011 ND 1ug/L4.05.0 Chlorobenzene 108-90-7 SM 6200B-2011 ND 1ug/L4.05.0 Chloroethane 75-00-3 SM 6200B-2011 ND 1ug/L4.05.0 Chloroform 67-66-3 SM 6200B-2011 ND 1ug/L4.05.0 Chloromethane (Methyl chloride)74-87-3 SM 6200B-2011 ND 2ug/L4.05.0 2-Chlorotoluene 95-49-8 SM 6200B-2011 ND 1ug/L4.05.0 4-Chlorotoluene 106-43-4 SM 6200B-2011 ND 1ug/L4.05.0 Dibromochloromethane 124-48-1 SM 6200B-2011 ND 1ug/L4.05.0 1,2-Dibromoethane (EDB)106-93-4 SM 6200B-2011 ND 1ug/L4.05.0 Dibromomethane (Methylene bromide)74-95-3 SM 6200B-2011 ND 1ug/L4.05.0 1,2-Dichlorobenzene 95-50-1 SM 6200B-2011 ND 1ug/L4.05.0 1,3-Dichlorobenzene 541-73-1 SM 6200B-2011 ND 1ug/L4.05.0 1,4-Dichlorobenzene 106-46-7 SM 6200B-2011 ND 1ug/L4.05.0 Dichlorodifluoromethane 75-71-8 SM 6200B-2011 ND 2ug/L4.05.0 1,1-Dichloroethane 75-34-3 SM 6200B-2011 ND 1ug/L4.05.0 1,2-Dichloroethane 107-06-2 SM 6200B-2011 ND 1ug/L4.05.0 1,1-Dichloroethene 75-35-4 SM 6200B-2011 ND 1ug/L4.05.0 cis-1,2-Dichloroethene 156-59-2 SM 6200B-2011 ND 1ug/L4.05.0 trans-1,2-Dichloroethene 156-60-5 SM 6200B-2011 ND 1ug/L4.05.0 1,2-Dichloropropane 78-87-5 SM 6200B-2011 ND 1ug/L4.05.0 1,3-Dichloropropane 142-28-9 SM 6200B-2011 ND 1ug/L4.05.0 2,2-Dichloropropane 594-20-7 SM 6200B-2011 ND 1ug/L4.05.0 1,1-Dichloropropene 563-58-6 SM 6200B-2011 ND 1ug/L4.05.0 cis-1,3-Dichloropropene 10061-01-5 SM 6200B-2011 ND 1ug/L4.05.0 trans-1,3-Dichloropropene 10061-02-6 SM 6200B-2011 ND 1ug/L4.05.0 Diisopropyl ether (IPE)108-20-3 SM 6200B-2011 15 1ug/L4.05.0 Ethylbenzene 100-41-4 SM 6200B-2011 37 1ug/L4.05.0 Hexachlorobutadiene 87-68-3 SM 6200B-2011 ND 1ug/L4.05.0 2-Hexanone 591-78-6 SM 6200B-2011 ND 1ug/L20100 Isopropylbenzene (Cumene)98-82-8 SM 6200B-2011 7.5 1ug/L4.05.0 p-Isopropyltoluene (p-Cymene)99-87-6 SM 6200B-2011 ND 1ug/L4.05.0 Methyl tertiary butyl ether (MTBE)1634-04-4 SM 6200B-2011 42 1ug/L4.05.0 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 8 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. MW-1 YB08028-002 02/07/2023 1030 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 10 02/16/2023 1826 JWO 67751 2 SM 6200B-SM 6200B-2011 10 02/20/2023 0134 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL 4-Methyl-2-pentanone 108-10-1 SM 6200B-2011 ND 1ug/L20100 Methylene chloride 75-09-2 SM 6200B-2011 ND 1ug/L4.05.0 Naphthalene 91-20-3 SM 6200B-2011 32 1ug/L4.05.0 n-Propylbenzene 103-65-1 SM 6200B-2011 18 1ug/L4.05.0 Styrene 100-42-5 SM 6200B-2011 ND 1ug/L4.05.0 1,1,1,2-Tetrachloroethane 630-20-6 SM 6200B-2011 ND 1ug/L4.05.0 1,1,2,2-Tetrachloroethane 79-34-5 SM 6200B-2011 ND 1ug/L4.05.0 Tetrachloroethene 127-18-4 SM 6200B-2011 ND 1ug/L4.05.0 Toluene 108-88-3 SM 6200B-2011 18 1ug/L4.05.0 1,1,2-Trichloro-1,2,2-Trifluoroethane 76-13-1 SM 6200B-2011 ND 1ug/L4.05.0 1,2,3-Trichlorobenzene 87-61-6 SM 6200B-2011 ND 1ug/L4.05.0 1,2,4-Trichlorobenzene 120-82-1 SM 6200B-2011 ND 1ug/L4.05.0 1,1,1-Trichloroethane 71-55-6 SM 6200B-2011 ND 1ug/L4.05.0 1,1,2-Trichloroethane 79-00-5 SM 6200B-2011 ND 1ug/L4.05.0 Trichloroethene 79-01-6 SM 6200B-2011 ND 1ug/L4.05.0 Trichlorofluoromethane 75-69-4 SM 6200B-2011 ND S 1ug/L4.05.0 1,2,3-Trichloropropane 96-18-4 SM 6200B-2011 ND 1ug/L4.05.0 1,3,5-Trimethylbenzene (Mesitylene)108-67-8 SM 6200B-2011 4.6 J 1ug/L4.05.0 1,2,4-Trimethylbenzene 95-63-6 SM 6200B-2011 15 1ug/L4.05.0 Vinyl chloride 75-01-4 SM 6200B-2011 ND 2ug/L4.05.0 m+p - Xylenes 179601-23-1 SM 6200B-2011 42 1ug/L4.05.0 o - Xylenes 95-47-6 SM 6200B-2011 ND 1ug/L4.05.0 AcceptanceAcceptanceRun 2Run 1 Surrogate Q % Recovery Limits % Recovery LimitsQ 1,2-Dichloroethane-d4 98 70-130 114 70-130 Bromofluorobenzene 103 70-130 106 70-130 Toluene-d8 103 70-130 111 70-130 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 9 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. MW-2 YB08028-003 02/07/2023 1105 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 2 SM 6200B-SM 6200B-2011 1 02/20/2023 2302 CDA 68047 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Acetone 67-64-1 SM 6200B-2011 ND L 2ug/L4.010 Benzene 71-43-2 SM 6200B-2011 130 2ug/L0.400.50 Bromobenzene 108-86-1 SM 6200B-2011 ND 2ug/L0.400.50 Bromochloromethane 74-97-5 SM 6200B-2011 ND 2ug/L0.400.50 Bromodichloromethane 75-27-4 SM 6200B-2011 ND 2ug/L0.400.50 Bromoform 75-25-2 SM 6200B-2011 ND 2ug/L0.400.50 Bromomethane (Methyl bromide)74-83-9 SM 6200B-2011 ND 2ug/L0.400.50 2-Butanone (MEK)78-93-3 SM 6200B-2011 ND 2ug/L2.010 n-Butylbenzene 104-51-8 SM 6200B-2011 5.3 2ug/L0.400.50 sec-Butylbenzene 135-98-8 SM 6200B-2011 3.4 2ug/L0.400.50 tert-Butylbenzene 98-06-6 SM 6200B-2011 0.92 2ug/L0.400.50 Carbon tetrachloride 56-23-5 SM 6200B-2011 ND 2ug/L0.400.50 Chlorobenzene 108-90-7 SM 6200B-2011 ND 2ug/L0.400.50 Chloroethane 75-00-3 SM 6200B-2011 0.48 J 2ug/L0.400.50 Chloroform 67-66-3 SM 6200B-2011 ND 2ug/L0.400.50 Chloromethane (Methyl chloride)74-87-3 SM 6200B-2011 ND L 2ug/L0.400.50 2-Chlorotoluene 95-49-8 SM 6200B-2011 ND 2ug/L0.400.50 4-Chlorotoluene 106-43-4 SM 6200B-2011 ND 2ug/L0.400.50 Dibromochloromethane 124-48-1 SM 6200B-2011 ND 2ug/L0.400.50 1,2-Dibromoethane (EDB)106-93-4 SM 6200B-2011 ND 2ug/L0.400.50 Dibromomethane (Methylene bromide)74-95-3 SM 6200B-2011 ND 2ug/L0.400.50 1,2-Dichlorobenzene 95-50-1 SM 6200B-2011 ND 2ug/L0.400.50 1,3-Dichlorobenzene 541-73-1 SM 6200B-2011 ND 2ug/L0.400.50 1,4-Dichlorobenzene 106-46-7 SM 6200B-2011 ND 2ug/L0.400.50 Dichlorodifluoromethane 75-71-8 SM 6200B-2011 ND L 2ug/L0.400.50 1,1-Dichloroethane 75-34-3 SM 6200B-2011 ND 2ug/L0.400.50 1,2-Dichloroethane 107-06-2 SM 6200B-2011 4.3 2ug/L0.400.50 1,1-Dichloroethene 75-35-4 SM 6200B-2011 ND 2ug/L0.400.50 cis-1,2-Dichloroethene 156-59-2 SM 6200B-2011 ND 2ug/L0.400.50 trans-1,2-Dichloroethene 156-60-5 SM 6200B-2011 ND 2ug/L0.400.50 1,2-Dichloropropane 78-87-5 SM 6200B-2011 ND 2ug/L0.400.50 1,3-Dichloropropane 142-28-9 SM 6200B-2011 ND 2ug/L0.400.50 2,2-Dichloropropane 594-20-7 SM 6200B-2011 ND 2ug/L0.400.50 1,1-Dichloropropene 563-58-6 SM 6200B-2011 ND 2ug/L0.400.50 cis-1,3-Dichloropropene 10061-01-5 SM 6200B-2011 ND 2ug/L0.400.50 trans-1,3-Dichloropropene 10061-02-6 SM 6200B-2011 ND 2ug/L0.400.50 Diisopropyl ether (IPE)108-20-3 SM 6200B-2011 92 2ug/L0.400.50 Ethylbenzene 100-41-4 SM 6200B-2011 43 2ug/L0.400.50 Hexachlorobutadiene 87-68-3 SM 6200B-2011 ND 2ug/L0.400.50 2-Hexanone 591-78-6 SM 6200B-2011 ND 2ug/L2.010 Isopropylbenzene (Cumene)98-82-8 SM 6200B-2011 24 2ug/L0.400.50 p-Isopropyltoluene (p-Cymene)99-87-6 SM 6200B-2011 1.5 2ug/L0.400.50 Methyl tertiary butyl ether (MTBE)1634-04-4 SM 6200B-2011 44 2ug/L0.400.50 4-Methyl-2-pentanone 108-10-1 SM 6200B-2011 ND 2ug/L2.010 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 10 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. MW-2 YB08028-003 02/07/2023 1105 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 2 SM 6200B-SM 6200B-2011 1 02/20/2023 2302 CDA 68047 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Methylene chloride 75-09-2 SM 6200B-2011 ND 2ug/L0.400.50 Naphthalene 91-20-3 SM 6200B-2011 35 2ug/L0.400.50 n-Propylbenzene 103-65-1 SM 6200B-2011 26 2ug/L0.400.50 Styrene 100-42-5 SM 6200B-2011 ND 2ug/L0.400.50 1,1,1,2-Tetrachloroethane 630-20-6 SM 6200B-2011 ND 2ug/L0.400.50 1,1,2,2-Tetrachloroethane 79-34-5 SM 6200B-2011 ND 2ug/L0.400.50 Tetrachloroethene 127-18-4 SM 6200B-2011 ND 2ug/L0.400.50 Toluene 108-88-3 SM 6200B-2011 7.9 2ug/L0.400.50 1,1,2-Trichloro-1,2,2-Trifluoroethane 76-13-1 SM 6200B-2011 ND 2ug/L0.400.50 1,2,3-Trichlorobenzene 87-61-6 SM 6200B-2011 ND 2ug/L0.400.50 1,2,4-Trichlorobenzene 120-82-1 SM 6200B-2011 ND 2ug/L0.400.50 1,1,1-Trichloroethane 71-55-6 SM 6200B-2011 ND 2ug/L0.400.50 1,1,2-Trichloroethane 79-00-5 SM 6200B-2011 ND 2ug/L0.400.50 Trichloroethene 79-01-6 SM 6200B-2011 ND 2ug/L0.400.50 Trichlorofluoromethane 75-69-4 SM 6200B-2011 ND 2ug/L0.400.50 1,2,3-Trichloropropane 96-18-4 SM 6200B-2011 ND 2ug/L0.400.50 1,3,5-Trimethylbenzene (Mesitylene)108-67-8 SM 6200B-2011 1.1 2ug/L0.400.50 1,2,4-Trimethylbenzene 95-63-6 SM 6200B-2011 1.4 2ug/L0.400.50 Vinyl chloride 75-01-4 SM 6200B-2011 ND 2ug/L0.400.50 m+p - Xylenes 179601-23-1 SM 6200B-2011 13 2ug/L0.400.50 o - Xylenes 95-47-6 SM 6200B-2011 1.7 2ug/L0.400.50 AcceptanceRun 2 Surrogate Q % Recovery Limits 1,2-Dichloroethane-d4 91 70-130 Bromofluorobenzene 106 70-130 Toluene-d8 105 70-130 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 11 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. MW-3 YB08028-004 02/07/2023 1135 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 50 02/16/2023 1912 JWO 67751 2 SM 6200B-SM 6200B-2011 50 02/20/2023 0158 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Acetone 67-64-1 SM 6200B-2011 ND 1ug/L200500 Benzene 71-43-2 SM 6200B-2011 2200 1ug/L2025 Bromobenzene 108-86-1 SM 6200B-2011 ND 1ug/L2025 Bromochloromethane 74-97-5 SM 6200B-2011 ND 1ug/L2025 Bromodichloromethane 75-27-4 SM 6200B-2011 ND 1ug/L2025 Bromoform 75-25-2 SM 6200B-2011 ND 1ug/L2025 Bromomethane (Methyl bromide)74-83-9 SM 6200B-2011 ND 1ug/L2025 2-Butanone (MEK)78-93-3 SM 6200B-2011 ND 1ug/L100500 n-Butylbenzene 104-51-8 SM 6200B-2011 ND 1ug/L2025 sec-Butylbenzene 135-98-8 SM 6200B-2011 ND 1ug/L2025 tert-Butylbenzene 98-06-6 SM 6200B-2011 ND 1ug/L2025 Carbon tetrachloride 56-23-5 SM 6200B-2011 ND 1ug/L2025 Chlorobenzene 108-90-7 SM 6200B-2011 ND 1ug/L2025 Chloroethane 75-00-3 SM 6200B-2011 ND 1ug/L2025 Chloroform 67-66-3 SM 6200B-2011 ND 1ug/L2025 Chloromethane (Methyl chloride)74-87-3 SM 6200B-2011 ND 2ug/L2025 2-Chlorotoluene 95-49-8 SM 6200B-2011 ND 1ug/L2025 4-Chlorotoluene 106-43-4 SM 6200B-2011 ND 1ug/L2025 Dibromochloromethane 124-48-1 SM 6200B-2011 ND 1ug/L2025 1,2-Dibromoethane (EDB)106-93-4 SM 6200B-2011 ND 1ug/L2025 Dibromomethane (Methylene bromide)74-95-3 SM 6200B-2011 ND 1ug/L2025 1,2-Dichlorobenzene 95-50-1 SM 6200B-2011 ND 1ug/L2025 1,3-Dichlorobenzene 541-73-1 SM 6200B-2011 ND 1ug/L2025 1,4-Dichlorobenzene 106-46-7 SM 6200B-2011 ND 1ug/L2025 Dichlorodifluoromethane 75-71-8 SM 6200B-2011 ND 2ug/L2025 1,1-Dichloroethane 75-34-3 SM 6200B-2011 ND 1ug/L2025 1,2-Dichloroethane 107-06-2 SM 6200B-2011 99 1ug/L2025 1,1-Dichloroethene 75-35-4 SM 6200B-2011 ND 1ug/L2025 cis-1,2-Dichloroethene 156-59-2 SM 6200B-2011 ND 1ug/L2025 trans-1,2-Dichloroethene 156-60-5 SM 6200B-2011 ND 1ug/L2025 1,2-Dichloropropane 78-87-5 SM 6200B-2011 ND 1ug/L2025 1,3-Dichloropropane 142-28-9 SM 6200B-2011 ND 1ug/L2025 2,2-Dichloropropane 594-20-7 SM 6200B-2011 ND 1ug/L2025 1,1-Dichloropropene 563-58-6 SM 6200B-2011 ND 1ug/L2025 cis-1,3-Dichloropropene 10061-01-5 SM 6200B-2011 ND 1ug/L2025 trans-1,3-Dichloropropene 10061-02-6 SM 6200B-2011 ND 1ug/L2025 Diisopropyl ether (IPE)108-20-3 SM 6200B-2011 2400 1ug/L2025 Ethylbenzene 100-41-4 SM 6200B-2011 280 1ug/L2025 Hexachlorobutadiene 87-68-3 SM 6200B-2011 ND 1ug/L2025 2-Hexanone 591-78-6 SM 6200B-2011 ND 1ug/L100500 Isopropylbenzene (Cumene)98-82-8 SM 6200B-2011 30 1ug/L2025 p-Isopropyltoluene (p-Cymene)99-87-6 SM 6200B-2011 ND 1ug/L2025 Methyl tertiary butyl ether (MTBE)1634-04-4 SM 6200B-2011 1500 1ug/L2025 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 12 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. MW-3 YB08028-004 02/07/2023 1135 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 50 02/16/2023 1912 JWO 67751 2 SM 6200B-SM 6200B-2011 50 02/20/2023 0158 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL 4-Methyl-2-pentanone 108-10-1 SM 6200B-2011 ND 1ug/L100500 Methylene chloride 75-09-2 SM 6200B-2011 ND 1ug/L2025 Naphthalene 91-20-3 SM 6200B-2011 130 1ug/L2025 n-Propylbenzene 103-65-1 SM 6200B-2011 57 1ug/L2025 Styrene 100-42-5 SM 6200B-2011 ND 1ug/L2025 1,1,1,2-Tetrachloroethane 630-20-6 SM 6200B-2011 ND 1ug/L2025 1,1,2,2-Tetrachloroethane 79-34-5 SM 6200B-2011 ND 1ug/L2025 Tetrachloroethene 127-18-4 SM 6200B-2011 ND 1ug/L2025 Toluene 108-88-3 SM 6200B-2011 53 1ug/L2025 1,1,2-Trichloro-1,2,2-Trifluoroethane 76-13-1 SM 6200B-2011 ND 1ug/L2025 1,2,3-Trichlorobenzene 87-61-6 SM 6200B-2011 ND 1ug/L2025 1,2,4-Trichlorobenzene 120-82-1 SM 6200B-2011 ND 1ug/L2025 1,1,1-Trichloroethane 71-55-6 SM 6200B-2011 ND 1ug/L2025 1,1,2-Trichloroethane 79-00-5 SM 6200B-2011 ND 1ug/L2025 Trichloroethene 79-01-6 SM 6200B-2011 ND 1ug/L2025 Trichlorofluoromethane 75-69-4 SM 6200B-2011 ND 1ug/L2025 1,2,3-Trichloropropane 96-18-4 SM 6200B-2011 ND 1ug/L2025 1,3,5-Trimethylbenzene (Mesitylene)108-67-8 SM 6200B-2011 78 1ug/L2025 1,2,4-Trimethylbenzene 95-63-6 SM 6200B-2011 210 1ug/L2025 Vinyl chloride 75-01-4 SM 6200B-2011 ND 2ug/L2025 m+p - Xylenes 179601-23-1 SM 6200B-2011 260 1ug/L2025 o - Xylenes 95-47-6 SM 6200B-2011 ND 1ug/L2025 AcceptanceAcceptanceRun 2Run 1 Surrogate Q % Recovery Limits % Recovery LimitsQ 1,2-Dichloroethane-d4 95 70-130 111 70-130 Bromofluorobenzene 101 70-130 102 70-130 Toluene-d8 102 70-130 106 70-130 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 13 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. FB-01 YB08028-005 02/07/2023 1145 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 1 02/16/2023 1417 JWO 67751 2 SM 6200B-SM 6200B-2011 1 02/19/2023 2127 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Acetone 67-64-1 SM 6200B-2011 14 1ug/L4.010 Benzene 71-43-2 SM 6200B-2011 ND 1ug/L0.400.50 Bromobenzene 108-86-1 SM 6200B-2011 ND 1ug/L0.400.50 Bromochloromethane 74-97-5 SM 6200B-2011 ND 1ug/L0.400.50 Bromodichloromethane 75-27-4 SM 6200B-2011 ND 1ug/L0.400.50 Bromoform 75-25-2 SM 6200B-2011 ND 1ug/L0.400.50 Bromomethane (Methyl bromide)74-83-9 SM 6200B-2011 ND 1ug/L0.400.50 2-Butanone (MEK)78-93-3 SM 6200B-2011 ND 1ug/L2.010 n-Butylbenzene 104-51-8 SM 6200B-2011 ND 1ug/L0.400.50 sec-Butylbenzene 135-98-8 SM 6200B-2011 ND 1ug/L0.400.50 tert-Butylbenzene 98-06-6 SM 6200B-2011 ND 1ug/L0.400.50 Carbon tetrachloride 56-23-5 SM 6200B-2011 ND 1ug/L0.400.50 Chlorobenzene 108-90-7 SM 6200B-2011 ND 1ug/L0.400.50 Chloroethane 75-00-3 SM 6200B-2011 ND 1ug/L0.400.50 Chloroform 67-66-3 SM 6200B-2011 ND 1ug/L0.400.50 Chloromethane (Methyl chloride)74-87-3 SM 6200B-2011 ND 2ug/L0.400.50 2-Chlorotoluene 95-49-8 SM 6200B-2011 ND 1ug/L0.400.50 4-Chlorotoluene 106-43-4 SM 6200B-2011 ND 1ug/L0.400.50 Dibromochloromethane 124-48-1 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dibromoethane (EDB)106-93-4 SM 6200B-2011 ND 1ug/L0.400.50 Dibromomethane (Methylene bromide)74-95-3 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dichlorobenzene 95-50-1 SM 6200B-2011 ND 1ug/L0.400.50 1,3-Dichlorobenzene 541-73-1 SM 6200B-2011 ND 1ug/L0.400.50 1,4-Dichlorobenzene 106-46-7 SM 6200B-2011 ND 1ug/L0.400.50 Dichlorodifluoromethane 75-71-8 SM 6200B-2011 ND 2ug/L0.400.50 1,1-Dichloroethane 75-34-3 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dichloroethane 107-06-2 SM 6200B-2011 ND 1ug/L0.400.50 1,1-Dichloroethene 75-35-4 SM 6200B-2011 ND 1ug/L0.400.50 cis-1,2-Dichloroethene 156-59-2 SM 6200B-2011 ND 1ug/L0.400.50 trans-1,2-Dichloroethene 156-60-5 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dichloropropane 78-87-5 SM 6200B-2011 ND 1ug/L0.400.50 1,3-Dichloropropane 142-28-9 SM 6200B-2011 ND 1ug/L0.400.50 2,2-Dichloropropane 594-20-7 SM 6200B-2011 ND 1ug/L0.400.50 1,1-Dichloropropene 563-58-6 SM 6200B-2011 ND 1ug/L0.400.50 cis-1,3-Dichloropropene 10061-01-5 SM 6200B-2011 ND 1ug/L0.400.50 trans-1,3-Dichloropropene 10061-02-6 SM 6200B-2011 ND 1ug/L0.400.50 Diisopropyl ether (IPE)108-20-3 SM 6200B-2011 ND 1ug/L0.400.50 Ethylbenzene 100-41-4 SM 6200B-2011 ND 1ug/L0.400.50 Hexachlorobutadiene 87-68-3 SM 6200B-2011 ND 1ug/L0.400.50 2-Hexanone 591-78-6 SM 6200B-2011 ND 1ug/L2.010 Isopropylbenzene (Cumene)98-82-8 SM 6200B-2011 ND 1ug/L0.400.50 p-Isopropyltoluene (p-Cymene)99-87-6 SM 6200B-2011 ND 1ug/L0.400.50 Methyl tertiary butyl ether (MTBE)1634-04-4 SM 6200B-2011 ND 1ug/L0.400.50 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 14 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. FB-01 YB08028-005 02/07/2023 1145 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 1 02/16/2023 1417 JWO 67751 2 SM 6200B-SM 6200B-2011 1 02/19/2023 2127 JMM2 67950 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL 4-Methyl-2-pentanone 108-10-1 SM 6200B-2011 ND 1ug/L2.010 Methylene chloride 75-09-2 SM 6200B-2011 2.5 1ug/L0.400.50 Naphthalene 91-20-3 SM 6200B-2011 ND 1ug/L0.400.50 n-Propylbenzene 103-65-1 SM 6200B-2011 ND 1ug/L0.400.50 Styrene 100-42-5 SM 6200B-2011 ND 1ug/L0.400.50 1,1,1,2-Tetrachloroethane 630-20-6 SM 6200B-2011 ND 1ug/L0.400.50 1,1,2,2-Tetrachloroethane 79-34-5 SM 6200B-2011 ND 1ug/L0.400.50 Tetrachloroethene 127-18-4 SM 6200B-2011 ND 1ug/L0.400.50 Toluene 108-88-3 SM 6200B-2011 ND 1ug/L0.400.50 1,1,2-Trichloro-1,2,2-Trifluoroethane 76-13-1 SM 6200B-2011 ND 1ug/L0.400.50 1,2,3-Trichlorobenzene 87-61-6 SM 6200B-2011 ND 1ug/L0.400.50 1,2,4-Trichlorobenzene 120-82-1 SM 6200B-2011 ND 1ug/L0.400.50 1,1,1-Trichloroethane 71-55-6 SM 6200B-2011 ND 1ug/L0.400.50 1,1,2-Trichloroethane 79-00-5 SM 6200B-2011 ND 1ug/L0.400.50 Trichloroethene 79-01-6 SM 6200B-2011 ND 1ug/L0.400.50 Trichlorofluoromethane 75-69-4 SM 6200B-2011 ND 1ug/L0.400.50 1,2,3-Trichloropropane 96-18-4 SM 6200B-2011 ND 1ug/L0.400.50 1,3,5-Trimethylbenzene (Mesitylene)108-67-8 SM 6200B-2011 ND 1ug/L0.400.50 1,2,4-Trimethylbenzene 95-63-6 SM 6200B-2011 ND 1ug/L0.400.50 Vinyl chloride 75-01-4 SM 6200B-2011 ND 2ug/L0.400.50 m+p - Xylenes 179601-23-1 SM 6200B-2011 ND 1ug/L0.400.50 o - Xylenes 95-47-6 SM 6200B-2011 ND 1ug/L0.400.50 AcceptanceAcceptanceRun 2Run 1 Surrogate Q % Recovery Limits % Recovery LimitsQ 1,2-Dichloroethane-d4 99 70-130 115 70-130 Bromofluorobenzene 97 70-130 102 70-130 Toluene-d8 101 70-130 105 70-130 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 15 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. WSW-1 YB08028-006 02/07/2023 1200 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 1 02/20/2023 2326 CDA 68047 2 SM 6200B-SM 6200B-2011 1 02/22/2023 2156 JMM2 68276 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Acetone 67-64-1 SM 6200B-2011 ND L 1ug/L4.010 Benzene 71-43-2 SM 6200B-2011 ND 1ug/L0.400.50 Bromobenzene 108-86-1 SM 6200B-2011 ND 1ug/L0.400.50 Bromochloromethane 74-97-5 SM 6200B-2011 ND 1ug/L0.400.50 Bromodichloromethane 75-27-4 SM 6200B-2011 ND 1ug/L0.400.50 Bromoform 75-25-2 SM 6200B-2011 ND 1ug/L0.400.50 Bromomethane (Methyl bromide)74-83-9 SM 6200B-2011 ND 1ug/L0.400.50 2-Butanone (MEK)78-93-3 SM 6200B-2011 ND 1ug/L2.010 n-Butylbenzene 104-51-8 SM 6200B-2011 ND 1ug/L0.400.50 sec-Butylbenzene 135-98-8 SM 6200B-2011 ND 1ug/L0.400.50 tert-Butylbenzene 98-06-6 SM 6200B-2011 ND 1ug/L0.400.50 Carbon tetrachloride 56-23-5 SM 6200B-2011 ND 1ug/L0.400.50 Chlorobenzene 108-90-7 SM 6200B-2011 ND 1ug/L0.400.50 Chloroethane 75-00-3 SM 6200B-2011 ND 1ug/L0.400.50 Chloroform 67-66-3 SM 6200B-2011 ND 1ug/L0.400.50 Chloromethane (Methyl chloride)74-87-3 SM 6200B-2011 ND L 1ug/L0.400.50 2-Chlorotoluene 95-49-8 SM 6200B-2011 ND 1ug/L0.400.50 4-Chlorotoluene 106-43-4 SM 6200B-2011 ND 1ug/L0.400.50 Dibromochloromethane 124-48-1 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dibromoethane (EDB)106-93-4 SM 6200B-2011 ND 1ug/L0.400.50 Dibromomethane (Methylene bromide)74-95-3 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dichlorobenzene 95-50-1 SM 6200B-2011 ND 1ug/L0.400.50 1,3-Dichlorobenzene 541-73-1 SM 6200B-2011 ND 1ug/L0.400.50 1,4-Dichlorobenzene 106-46-7 SM 6200B-2011 ND 1ug/L0.400.50 Dichlorodifluoromethane 75-71-8 SM 6200B-2011 ND L 1ug/L0.400.50 1,1-Dichloroethane 75-34-3 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dichloroethane 107-06-2 SM 6200B-2011 ND 1ug/L0.400.50 1,1-Dichloroethene 75-35-4 SM 6200B-2011 ND 1ug/L0.400.50 cis-1,2-Dichloroethene 156-59-2 SM 6200B-2011 ND 1ug/L0.400.50 trans-1,2-Dichloroethene 156-60-5 SM 6200B-2011 ND 1ug/L0.400.50 1,2-Dichloropropane 78-87-5 SM 6200B-2011 ND 1ug/L0.400.50 1,3-Dichloropropane 142-28-9 SM 6200B-2011 ND 1ug/L0.400.50 2,2-Dichloropropane 594-20-7 SM 6200B-2011 ND 1ug/L0.400.50 1,1-Dichloropropene 563-58-6 SM 6200B-2011 ND 1ug/L0.400.50 cis-1,3-Dichloropropene 10061-01-5 SM 6200B-2011 ND 1ug/L0.400.50 trans-1,3-Dichloropropene 10061-02-6 SM 6200B-2011 ND 1ug/L0.400.50 Diisopropyl ether (IPE)108-20-3 SM 6200B-2011 ND 1ug/L0.400.50 Ethylbenzene 100-41-4 SM 6200B-2011 ND 1ug/L0.400.50 Hexachlorobutadiene 87-68-3 SM 6200B-2011 ND 1ug/L0.400.50 2-Hexanone 591-78-6 SM 6200B-2011 ND 1ug/L2.010 Isopropylbenzene (Cumene)98-82-8 SM 6200B-2011 ND 1ug/L0.400.50 p-Isopropyltoluene (p-Cymene)99-87-6 SM 6200B-2011 ND 1ug/L0.400.50 Methyl tertiary butyl ether (MTBE)1634-04-4 SM 6200B-2011 ND 1ug/L0.400.50 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 16 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. WSW-1 YB08028-006 02/07/2023 1200 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 1 02/20/2023 2326 CDA 68047 2 SM 6200B-SM 6200B-2011 1 02/22/2023 2156 JMM2 68276 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL 4-Methyl-2-pentanone 108-10-1 SM 6200B-2011 ND 1ug/L2.010 Methylene chloride 75-09-2 SM 6200B-2011 ND 1ug/L0.400.50 Naphthalene 91-20-3 SM 6200B-2011 ND 1ug/L0.400.50 n-Propylbenzene 103-65-1 SM 6200B-2011 ND 1ug/L0.400.50 Styrene 100-42-5 SM 6200B-2011 ND 1ug/L0.400.50 1,1,1,2-Tetrachloroethane 630-20-6 SM 6200B-2011 ND 1ug/L0.400.50 1,1,2,2-Tetrachloroethane 79-34-5 SM 6200B-2011 ND 1ug/L0.400.50 Tetrachloroethene 127-18-4 SM 6200B-2011 ND 1ug/L0.400.50 Toluene 108-88-3 SM 6200B-2011 ND 1ug/L0.400.50 1,1,2-Trichloro-1,2,2-Trifluoroethane 76-13-1 SM 6200B-2011 ND 1ug/L0.400.50 1,2,3-Trichlorobenzene 87-61-6 SM 6200B-2011 ND 1ug/L0.400.50 1,2,4-Trichlorobenzene 120-82-1 SM 6200B-2011 ND 1ug/L0.400.50 1,1,1-Trichloroethane 71-55-6 SM 6200B-2011 ND 1ug/L0.400.50 1,1,2-Trichloroethane 79-00-5 SM 6200B-2011 ND 1ug/L0.400.50 Trichloroethene 79-01-6 SM 6200B-2011 ND 1ug/L0.400.50 Trichlorofluoromethane 75-69-4 SM 6200B-2011 ND 1ug/L0.400.50 1,2,3-Trichloropropane 96-18-4 SM 6200B-2011 ND 1ug/L0.400.50 1,3,5-Trimethylbenzene (Mesitylene)108-67-8 SM 6200B-2011 ND 1ug/L0.400.50 1,2,4-Trimethylbenzene 95-63-6 SM 6200B-2011 ND 1ug/L0.400.50 Vinyl chloride 75-01-4 SM 6200B-2011 ND 1ug/L0.400.50 m+p - Xylenes 179601-23-1 SM 6200B-2011 ND 1ug/L0.400.50 o - Xylenes 95-47-6 SM 6200B-2011 ND 1ug/L0.400.50 AcceptanceAcceptanceRun 2Run 1 Surrogate Q % Recovery Limits % Recovery LimitsQ 1,2-Dichloroethane-d4 96 70-130 H 99 70-130 Bromofluorobenzene 96 70-130 H 99 70-130 Toluene-d8 101 70-130 H 98 70-130 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 17 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. WSW-1 YB08028-006 02/07/2023 1200 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 1 02/20/2023 2326 CDA 68047 2 SM 6200B-SM 6200B-2011 1 02/22/2023 2156 JMM2 68276 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL Acetone 67-64-1 SM 6200B-2011 ND H 2ug/L4.010 Benzene 71-43-2 SM 6200B-2011 ND H 2ug/L0.400.50 Bromobenzene 108-86-1 SM 6200B-2011 ND H 2ug/L0.400.50 Bromochloromethane 74-97-5 SM 6200B-2011 ND H 2ug/L0.400.50 Bromodichloromethane 75-27-4 SM 6200B-2011 ND H 2ug/L0.400.50 Bromoform 75-25-2 SM 6200B-2011 ND H 2ug/L0.400.50 Bromomethane (Methyl bromide)74-83-9 SM 6200B-2011 ND H 2ug/L0.400.50 2-Butanone (MEK)78-93-3 SM 6200B-2011 ND H 2ug/L2.010 n-Butylbenzene 104-51-8 SM 6200B-2011 ND H 2ug/L0.400.50 sec-Butylbenzene 135-98-8 SM 6200B-2011 ND H 2ug/L0.400.50 tert-Butylbenzene 98-06-6 SM 6200B-2011 ND H 2ug/L0.400.50 Carbon tetrachloride 56-23-5 SM 6200B-2011 ND H 2ug/L0.400.50 Chlorobenzene 108-90-7 SM 6200B-2011 ND H 2ug/L0.400.50 Chloroethane 75-00-3 SM 6200B-2011 ND H 2ug/L0.400.50 Chloroform 67-66-3 SM 6200B-2011 ND H 2ug/L0.400.50 Chloromethane (Methyl chloride)74-87-3 SM 6200B-2011 ND H 2ug/L0.400.50 2-Chlorotoluene 95-49-8 SM 6200B-2011 ND H 2ug/L0.400.50 4-Chlorotoluene 106-43-4 SM 6200B-2011 ND H 2ug/L0.400.50 Dibromochloromethane 124-48-1 SM 6200B-2011 ND H 2ug/L0.400.50 1,2-Dibromoethane (EDB)106-93-4 SM 6200B-2011 ND H 2ug/L0.400.50 Dibromomethane (Methylene bromide)74-95-3 SM 6200B-2011 ND H 2ug/L0.400.50 1,2-Dichlorobenzene 95-50-1 SM 6200B-2011 ND H 2ug/L0.400.50 1,3-Dichlorobenzene 541-73-1 SM 6200B-2011 ND H 2ug/L0.400.50 1,4-Dichlorobenzene 106-46-7 SM 6200B-2011 ND H 2ug/L0.400.50 Dichlorodifluoromethane 75-71-8 SM 6200B-2011 ND H 2ug/L0.400.50 1,1-Dichloroethane 75-34-3 SM 6200B-2011 ND H 2ug/L0.400.50 1,2-Dichloroethane 107-06-2 SM 6200B-2011 ND H 2ug/L0.400.50 1,1-Dichloroethene 75-35-4 SM 6200B-2011 ND H 2ug/L0.400.50 cis-1,2-Dichloroethene 156-59-2 SM 6200B-2011 ND H 2ug/L0.400.50 trans-1,2-Dichloroethene 156-60-5 SM 6200B-2011 ND H 2ug/L0.400.50 1,2-Dichloropropane 78-87-5 SM 6200B-2011 ND H 2ug/L0.400.50 1,3-Dichloropropane 142-28-9 SM 6200B-2011 ND H 2ug/L0.400.50 2,2-Dichloropropane 594-20-7 SM 6200B-2011 ND H 2ug/L0.400.50 1,1-Dichloropropene 563-58-6 SM 6200B-2011 ND H 2ug/L0.400.50 cis-1,3-Dichloropropene 10061-01-5 SM 6200B-2011 ND H 2ug/L0.400.50 trans-1,3-Dichloropropene 10061-02-6 SM 6200B-2011 ND H 2ug/L0.400.50 Diisopropyl ether (IPE)108-20-3 SM 6200B-2011 ND H 2ug/L0.400.50 Ethylbenzene 100-41-4 SM 6200B-2011 ND H 2ug/L0.400.50 Hexachlorobutadiene 87-68-3 SM 6200B-2011 ND H 2ug/L0.400.50 2-Hexanone 591-78-6 SM 6200B-2011 ND H 2ug/L2.010 Isopropylbenzene (Cumene)98-82-8 SM 6200B-2011 ND H 2ug/L0.400.50 p-Isopropyltoluene (p-Cymene)99-87-6 SM 6200B-2011 ND H 2ug/L0.400.50 Methyl tertiary butyl ether (MTBE)1634-04-4 SM 6200B-2011 ND H 2ug/L0.400.50 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 18 of 41 Volatile Organic Compounds by GC/MS Description:Matrix: Date Received: Client:Laboratory ID: Date Sampled: Terracon Consultants, Inc. WSW-1 YB08028-006 02/07/2023 1200 02/08/2023 Aqueous Project Name: Erect Grocery Project Number: 70207596 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 SM 6200B-SM 6200B-2011 1 02/20/2023 2326 CDA 68047 2 SM 6200B-SM 6200B-2011 1 02/22/2023 2156 JMM2 68276 AnalyticalCAS Parameter Number Method Result Q LOQ Units Run DL 4-Methyl-2-pentanone 108-10-1 SM 6200B-2011 ND H 2ug/L2.010 Methylene chloride 75-09-2 SM 6200B-2011 ND H 2ug/L0.400.50 Naphthalene 91-20-3 SM 6200B-2011 ND H 2ug/L0.400.50 n-Propylbenzene 103-65-1 SM 6200B-2011 ND H 2ug/L0.400.50 Styrene 100-42-5 SM 6200B-2011 ND H 2ug/L0.400.50 1,1,1,2-Tetrachloroethane 630-20-6 SM 6200B-2011 ND H 2ug/L0.400.50 1,1,2,2-Tetrachloroethane 79-34-5 SM 6200B-2011 ND H 2ug/L0.400.50 Tetrachloroethene 127-18-4 SM 6200B-2011 ND H 2ug/L0.400.50 Toluene 108-88-3 SM 6200B-2011 ND H 2ug/L0.400.50 1,1,2-Trichloro-1,2,2-Trifluoroethane 76-13-1 SM 6200B-2011 ND H 2ug/L0.400.50 1,2,3-Trichlorobenzene 87-61-6 SM 6200B-2011 ND H 2ug/L0.400.50 1,2,4-Trichlorobenzene 120-82-1 SM 6200B-2011 ND H 2ug/L0.400.50 1,1,1-Trichloroethane 71-55-6 SM 6200B-2011 ND H 2ug/L0.400.50 1,1,2-Trichloroethane 79-00-5 SM 6200B-2011 ND H 2ug/L0.400.50 Trichloroethene 79-01-6 SM 6200B-2011 ND H 2ug/L0.400.50 Trichlorofluoromethane 75-69-4 SM 6200B-2011 ND H 2ug/L0.400.50 1,2,3-Trichloropropane 96-18-4 SM 6200B-2011 ND H 2ug/L0.400.50 1,3,5-Trimethylbenzene (Mesitylene)108-67-8 SM 6200B-2011 ND H 2ug/L0.400.50 1,2,4-Trimethylbenzene 95-63-6 SM 6200B-2011 ND H 2ug/L0.400.50 Vinyl chloride 75-01-4 SM 6200B-2011 ND H 2ug/L0.400.50 m+p - Xylenes 179601-23-1 SM 6200B-2011 ND H 2ug/L0.400.50 o - Xylenes 95-47-6 SM 6200B-2011 ND H 2ug/L0.400.50 AcceptanceAcceptanceRun 2Run 1 Surrogate Q % Recovery Limits % Recovery LimitsQ 1,2-Dichloroethane-d4 96 70-130 H 99 70-130 Bromofluorobenzene 96 70-130 H 99 70-130 Toluene-d8 101 70-130 H 98 70-130 J = Estimated result < LOQ and > DL_ LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria H = Out of holding time Q = Surrogate failure L = LCS/LCSD failure S = MS/MSD failure DL = Detection Limit W = Reported on wet weight basis 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 19 of 41 QC Summary QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 20 of 41 Volatile Organic Compounds by GC/MS - MB Batch:Prep Method: Sample ID:YQ67751-001 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q LOQ DL Units Analysis DateDil Acetone ND 02/16/2023 1333104.0 ug/L1 Benzene ND 02/16/2023 13330.50 0.40 ug/L1 Bromobenzene ND 02/16/2023 13330.50 0.40 ug/L1 Bromochloromethane ND 02/16/2023 13330.50 0.40 ug/L1 Bromodichloromethane ND 02/16/2023 13330.50 0.40 ug/L1 Bromoform ND 02/16/2023 13330.50 0.40 ug/L1 Bromomethane (Methyl bromide)ND 02/16/2023 13330.50 0.40 ug/L1 2-Butanone (MEK)ND 02/16/2023 1333102.0 ug/L1 n-Butylbenzene ND 02/16/2023 13330.50 0.40 ug/L1 sec-Butylbenzene ND 02/16/2023 13330.50 0.40 ug/L1 tert-Butylbenzene ND 02/16/2023 13330.50 0.40 ug/L1 Carbon tetrachloride ND 02/16/2023 13330.50 0.40 ug/L1 Chlorobenzene ND 02/16/2023 13330.50 0.40 ug/L1 Chloroethane ND 02/16/2023 13330.50 0.40 ug/L1 Chloroform ND 02/16/2023 13330.50 0.40 ug/L1 2-Chlorotoluene ND 02/16/2023 13330.50 0.40 ug/L1 4-Chlorotoluene ND 02/16/2023 13330.50 0.40 ug/L1 Dibromochloromethane ND 02/16/2023 13330.50 0.40 ug/L1 1,2-Dibromoethane (EDB)ND 02/16/2023 13330.50 0.40 ug/L1 Dibromomethane (Methylene bromide)ND 02/16/2023 13330.50 0.40 ug/L1 1,2-Dichlorobenzene ND 02/16/2023 13330.50 0.40 ug/L1 1,3-Dichlorobenzene ND 02/16/2023 13330.50 0.40 ug/L1 1,4-Dichlorobenzene ND 02/16/2023 13330.50 0.40 ug/L1 1,1-Dichloroethane ND 02/16/2023 13330.50 0.40 ug/L1 1,2-Dichloroethane ND 02/16/2023 13330.50 0.40 ug/L1 1,1-Dichloroethene ND 02/16/2023 13330.50 0.40 ug/L1 cis-1,2-Dichloroethene ND 02/16/2023 13330.50 0.40 ug/L1 trans-1,2-Dichloroethene ND 02/16/2023 13330.50 0.40 ug/L1 1,2-Dichloropropane ND 02/16/2023 13330.50 0.40 ug/L1 1,3-Dichloropropane ND 02/16/2023 13330.50 0.40 ug/L1 2,2-Dichloropropane ND 02/16/2023 13330.50 0.40 ug/L1 1,1-Dichloropropene ND 02/16/2023 13330.50 0.40 ug/L1 cis-1,3-Dichloropropene ND 02/16/2023 13330.50 0.40 ug/L1 trans-1,3-Dichloropropene ND 02/16/2023 13330.50 0.40 ug/L1 Diisopropyl ether (IPE)ND 02/16/2023 13330.50 0.40 ug/L1 Ethylbenzene ND 02/16/2023 13330.50 0.40 ug/L1 Hexachlorobutadiene ND 02/16/2023 13330.50 0.40 ug/L1 2-Hexanone ND 02/16/2023 1333102.0 ug/L1 Isopropylbenzene (Cumene)ND 02/16/2023 13330.50 0.40 ug/L1 p-Isopropyltoluene (p-Cymene)ND 02/16/2023 13330.50 0.40 ug/L1 Methyl tertiary butyl ether (MTBE)ND 02/16/2023 13330.50 0.40 ug/L1 4-Methyl-2-pentanone ND 02/16/2023 1333102.0 ug/L1 Methylene chloride ND 02/16/2023 13330.50 0.40 ug/L1 Naphthalene ND 02/16/2023 13330.50 0.40 ug/L1 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 21 of 41 Volatile Organic Compounds by GC/MS - MB Batch:Prep Method: Sample ID:YQ67751-001 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q LOQ DL Units Analysis DateDil n-Propylbenzene ND 02/16/2023 13330.50 0.40 ug/L1 Styrene ND 02/16/2023 13330.50 0.40 ug/L1 1,1,1,2-Tetrachloroethane ND 02/16/2023 13330.50 0.40 ug/L1 1,1,2,2-Tetrachloroethane ND 02/16/2023 13330.50 0.40 ug/L1 Tetrachloroethene ND 02/16/2023 13330.50 0.40 ug/L1 Toluene ND 02/16/2023 13330.50 0.40 ug/L1 1,1,2-Trichloro-1,2,2-Trifluoroethane ND 02/16/2023 13330.50 0.40 ug/L1 1,2,3-Trichlorobenzene ND 02/16/2023 13330.50 0.40 ug/L1 1,2,4-Trichlorobenzene ND 02/16/2023 13330.50 0.40 ug/L1 1,1,1-Trichloroethane ND 02/16/2023 13330.50 0.40 ug/L1 1,1,2-Trichloroethane ND 02/16/2023 13330.50 0.40 ug/L1 Trichloroethene ND 02/16/2023 13330.50 0.40 ug/L1 Trichlorofluoromethane ND 02/16/2023 13330.50 0.40 ug/L1 1,2,3-Trichloropropane ND 02/16/2023 13330.50 0.40 ug/L1 1,3,5-Trimethylbenzene (Mesitylene)ND 02/16/2023 13330.50 0.40 ug/L1 1,2,4-Trimethylbenzene ND 02/16/2023 13330.50 0.40 ug/L1 m+p - Xylenes ND 02/16/2023 13330.50 0.40 ug/L1 o - Xylenes ND 02/16/2023 13330.50 0.40 ug/L1 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 96 70-130 Bromofluorobenzene 99 70-130 Toluene-d8 104 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 22 of 41 Volatile Organic Compounds by GC/MS - LCS Batch:Prep Method: Sample ID:YQ67751-002 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec LimitDil(ug/L)(ug/L) Acetone 89 02/16/2023 10018910070-1301 Benzene 45 02/16/2023 1001895070-1301 Bromobenzene 47 02/16/2023 1001955070-1301 Bromochloromethane 49 02/16/2023 1001975070-1301 Bromodichloromethane 45 02/16/2023 1001915070-1301 Bromoform 47 02/16/2023 1001945070-1301 Bromomethane (Methyl bromide)63 02/16/2023 10011255060-1401 2-Butanone (MEK)94 02/16/2023 10019410070-1301 n-Butylbenzene 50 02/16/2023 10011015070-1301 sec-Butylbenzene 52 02/16/2023 10011045070-1301 tert-Butylbenzene 52 02/16/2023 10011045070-1301 Carbon tetrachloride 46 02/16/2023 1001935070-1301 Chlorobenzene 46 02/16/2023 1001925070-1301 Chloroethane 59 02/16/2023 10011195060-1401 Chloroform 42 02/16/2023 1001845070-1301 2-Chlorotoluene 47 02/16/2023 1001945070-1301 4-Chlorotoluene 48 02/16/2023 1001975070-1301 Dibromochloromethane 47 02/16/2023 1001935070-1301 1,2-Dibromoethane (EDB)47 02/16/2023 1001955070-1301 Dibromomethane (Methylene bromide)46 02/16/2023 1001935070-1301 1,2-Dichlorobenzene 46 02/16/2023 1001915070-1301 1,3-Dichlorobenzene 45 02/16/2023 1001915070-1301 1,4-Dichlorobenzene 44 02/16/2023 1001875070-1301 1,1-Dichloroethane 44 02/16/2023 1001885070-1301 1,2-Dichloroethane 46 02/16/2023 1001925070-1301 1,1-Dichloroethene 46 02/16/2023 1001925070-1301 cis-1,2-Dichloroethene 46 02/16/2023 1001915070-1301 trans-1,2-Dichloroethene 45 02/16/2023 1001905070-1301 1,2-Dichloropropane 44 02/16/2023 1001895070-1301 1,3-Dichloropropane 46 02/16/2023 1001915070-1301 2,2-Dichloropropane 49 02/16/2023 1001985070-1301 1,1-Dichloropropene 45 02/16/2023 1001905070-1301 cis-1,3-Dichloropropene 50 02/16/2023 10011015070-1301 trans-1,3-Dichloropropene 43 02/16/2023 1001865070-1301 Diisopropyl ether (IPE)49 02/16/2023 1001985070-1301 Ethylbenzene 49 02/16/2023 1001975070-1301 Hexachlorobutadiene 47 02/16/2023 1001935070-1301 2-Hexanone 87 02/16/2023 10018710070-1301 Isopropylbenzene (Cumene)51 02/16/2023 10011015070-1301 p-Isopropyltoluene (p-Cymene)52 02/16/2023 10011045070-1301 Methyl tertiary butyl ether (MTBE)47 02/16/2023 1001955070-1301 4-Methyl-2-pentanone 95 02/16/2023 10019510070-1301 Methylene chloride 43 02/16/2023 1001865070-1301 Naphthalene 55 02/16/2023 10011105070-1301 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 23 of 41 Volatile Organic Compounds by GC/MS - LCS Batch:Prep Method: Sample ID:YQ67751-002 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec LimitDil(ug/L)(ug/L) n-Propylbenzene 51 02/16/2023 10011015070-1301 Styrene 46 02/16/2023 1001935070-1301 1,1,1,2-Tetrachloroethane 46 02/16/2023 1001925070-1301 1,1,2,2-Tetrachloroethane 45 02/16/2023 1001905070-1301 Tetrachloroethene 47 02/16/2023 1001945070-1301 Toluene 46 02/16/2023 1001935070-1301 1,1,2-Trichloro-1,2,2-Trifluoroethane 46 02/16/2023 1001925070-1301 1,2,3-Trichlorobenzene 48 02/16/2023 1001955070-1301 1,2,4-Trichlorobenzene 49 02/16/2023 1001985070-1301 1,1,1-Trichloroethane 45 02/16/2023 1001905070-1301 1,1,2-Trichloroethane 46 02/16/2023 1001915070-1301 Trichloroethene 46 02/16/2023 1001925070-1301 Trichlorofluoromethane 60 02/16/2023 10011205060-1401 1,2,3-Trichloropropane 48 02/16/2023 1001965070-1301 1,3,5-Trimethylbenzene (Mesitylene)53 02/16/2023 10011055070-1301 1,2,4-Trimethylbenzene 52 02/16/2023 10011045070-1301 m+p - Xylenes 51 02/16/2023 10011015070-1301 o - Xylenes 50 02/16/2023 1001995070-1301 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 86 70-130 Bromofluorobenzene 95 70-130 Toluene-d8 94 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 24 of 41 Volatile Organic Compounds by GC/MS - MS Batch:Prep Method: Sample ID:YB08028-002MS 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec Limit Sample Amount Dil(ug/L)(ug/L)(ug/L) Acetone 1200 02/16/2023 1957120100070-130ND10 Benzene 1000 02/16/2023 19579750070-13051010 Bromobenzene 510 02/16/2023 195710250070-130ND10 Bromochloromethane 530 02/16/2023 195710650070-130ND10 Bromodichloromethane 490 02/16/2023 19579850070-130ND10 Bromoform 460 02/16/2023 19579250070-130ND10 Bromomethane (Methyl bromide)690 02/16/2023 195713850060-140ND10 2-Butanone (MEK)1000 02/16/2023 1957101100070-130ND10 n-Butylbenzene 570 02/16/2023 195711250070-1308.8 10 sec-Butylbenzene 580 02/16/2023 195711750070-130ND10 tert-Butylbenzene 580 02/16/2023 195711650070-130ND10 Carbon tetrachloride 520 02/16/2023 195710450070-130ND10 Chlorobenzene 500 02/16/2023 195710050070-130ND10 Chloroethane 650 02/16/2023 195713050060-140ND10 Chloroform 470 02/16/2023 19579450070-130ND10 2-Chlorotoluene 510 02/16/2023 195710250070-130ND10 4-Chlorotoluene 520 02/16/2023 195710350070-130ND10 Dibromochloromethane 490 02/16/2023 19579750070-130ND10 1,2-Dibromoethane (EDB)510 02/16/2023 195710150070-130ND10 Dibromomethane (Methylene bromide)510 02/16/2023 195710250070-130ND10 1,2-Dichlorobenzene 490 02/16/2023 19579950070-130ND10 1,3-Dichlorobenzene 490 02/16/2023 19579750070-130ND10 1,4-Dichlorobenzene 460 02/16/2023 19579350070-130ND10 1,1-Dichloroethane 490 02/16/2023 19579850070-130ND10 1,2-Dichloroethane 500 02/16/2023 195710050070-130ND10 1,1-Dichloroethene 520 02/16/2023 195710550070-130ND10 cis-1,2-Dichloroethene 510 02/16/2023 195710150070-130ND10 trans-1,2-Dichloroethene 510 02/16/2023 195710250070-130ND10 1,2-Dichloropropane 500 02/16/2023 19579950070-130ND10 1,3-Dichloropropane 490 02/16/2023 19579950070-130ND10 2,2-Dichloropropane 470 02/16/2023 19579450070-130ND10 1,1-Dichloropropene 520 02/16/2023 195710450070-130ND10 cis-1,3-Dichloropropene 510 02/16/2023 195710350070-130ND10 trans-1,3-Dichloropropene 440 02/16/2023 19578850070-130ND10 Diisopropyl ether (IPE)540 02/16/2023 195710650070-1301510 Ethylbenzene 580 02/16/2023 195710850070-1303710 Hexachlorobutadiene 530 02/16/2023 195710650070-130ND10 2-Hexanone 920 02/16/2023 195792100070-130ND10 Isopropylbenzene (Cumene)580 02/16/2023 195711450070-1307.5 10 p-Isopropyltoluene (p-Cymene)580 02/16/2023 195711750070-130ND10 Methyl tertiary butyl ether (MTBE)560 02/16/2023 195710350070-1304210 4-Methyl-2-pentanone 1000 02/16/2023 1957101100070-130ND10 Methylene chloride 470 02/16/2023 19579450070-130ND10 Naphthalene 640 02/16/2023 195712150070-1303210 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 25 of 41 Volatile Organic Compounds by GC/MS - MS Batch:Prep Method: Sample ID:YB08028-002MS 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec Limit Sample Amount Dil(ug/L)(ug/L)(ug/L) n-Propylbenzene 570 02/16/2023 195711150070-1301810 Styrene 500 02/16/2023 195710150070-130ND10 1,1,1,2-Tetrachloroethane 500 02/16/2023 195710150070-130ND10 1,1,2,2-Tetrachloroethane 480 02/16/2023 19579650070-130ND10 Tetrachloroethene 530 02/16/2023 195710650070-130ND10 Toluene 540 02/16/2023 195710550070-1301810 1,1,2-Trichloro-1,2,2-Trifluoroethane 530 02/16/2023 195710650070-130ND10 1,2,3-Trichlorobenzene 510 02/16/2023 195710250070-130ND10 1,2,4-Trichlorobenzene 540 02/16/2023 195710850070-130ND10 1,1,1-Trichloroethane 510 02/16/2023 195710250070-130ND10 1,1,2-Trichloroethane 500 02/16/2023 195710050070-130ND10 Trichloroethene 520 02/16/2023 195710450070-130ND10 Trichlorofluoromethane 680 02/16/2023 195713650060-140ND10 1,2,3-Trichloropropane 500 02/16/2023 195710050070-130ND10 1,3,5-Trimethylbenzene (Mesitylene)590 02/16/2023 195711750070-1304.6 10 1,2,4-Trimethylbenzene 590 02/16/2023 195711450070-1301510 m+p - Xylenes 600 02/16/2023 195711350070-1304210 o - Xylenes 550 02/16/2023 195710950070-130ND10 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 93 70-130 Bromofluorobenzene 104 70-130 Toluene-d8 103 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 26 of 41 Volatile Organic Compounds by GC/MS - MSD Batch:Prep Method: Sample ID:YB08028-002MD 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date% RPD %Rec Limit % RPD Limit Sample Amount Dil(ug/L)(ug/L)(ug/L) Acetone 980 02/16/2023 202098100070-13020 20ND10 Benzene 1000 02/16/2023 20209750070-1300.046 2051010 Bromobenzene 520 02/16/2023 202010550070-1303.0 20ND10 Bromochloromethane 510 02/16/2023 202010250070-1303.5 20ND10 Bromodichloromethane 500 02/16/2023 202010050070-1302.0 20ND10 Bromoform 460 02/16/2023 20209150070-1300.47 20ND10 Bromomethane (Methyl bromide)710 02/16/2023 2020N14250060-1402.5 20ND10 2-Butanone (MEK)990 02/16/2023 202099100070-1302.0 20ND10 n-Butylbenzene 570 02/16/2023 202011150070-1300.31 208.8 10 sec-Butylbenzene 570 02/16/2023 202011350070-1302.7 20ND10 tert-Butylbenzene 570 02/16/2023 202011450070-1301.9 20ND10 Carbon tetrachloride 530 02/16/2023 202010650070-1301.9 20ND10 Chlorobenzene 510 02/16/2023 202010250070-1301.3 20ND10 Chloroethane 690 02/16/2023 202013850060-1406.1 20ND10 Chloroform 460 02/16/2023 20209350070-1300.94 20ND10 2-Chlorotoluene 520 02/16/2023 202010550070-1302.6 20ND10 4-Chlorotoluene 540 02/16/2023 202010850070-1304.9 20ND10 Dibromochloromethane 480 02/16/2023 20209750070-1300.31 20ND10 1,2-Dibromoethane (EDB)510 02/16/2023 202010350070-1301.7 20ND10 Dibromomethane (Methylene bromide)510 02/16/2023 202010250070-1300.21 20ND10 1,2-Dichlorobenzene 490 02/16/2023 20209750070-1301.6 20ND10 1,3-Dichlorobenzene 500 02/16/2023 202010050070-1302.8 20ND10 1,4-Dichlorobenzene 470 02/16/2023 20209550070-1302.1 20ND10 1,1-Dichloroethane 490 02/16/2023 20209850070-1300.075 20ND10 1,2-Dichloroethane 510 02/16/2023 202010150070-1301.3 20ND10 1,1-Dichloroethene 550 02/16/2023 202011050070-1305.2 20ND10 cis-1,2-Dichloroethene 510 02/16/2023 202010350070-1301.6 20ND10 trans-1,2-Dichloroethene 510 02/16/2023 202010250070-1300.42 20ND10 1,2-Dichloropropane 510 02/16/2023 202010150070-1302.1 20ND10 1,3-Dichloropropane 500 02/16/2023 202010150070-1302.2 20ND10 2,2-Dichloropropane 510 02/16/2023 202010250070-1307.8 20ND10 1,1-Dichloropropene 520 02/16/2023 202010550070-1300.53 20ND10 cis-1,3-Dichloropropene 540 02/16/2023 202010850070-1304.4 20ND10 trans-1,3-Dichloropropene 460 02/16/2023 20209250070-1303.6 20ND10 Diisopropyl ether (IPE)550 02/16/2023 202010850070-1301.7 201510 Ethylbenzene 590 02/16/2023 202011050070-1301.9 203710 Hexachlorobutadiene 530 02/16/2023 202010550070-1300.64 20ND10 2-Hexanone 930 02/16/2023 202093100070-1301.6 20ND10 Isopropylbenzene (Cumene)570 02/16/2023 202011350070-1301.5 207.5 10 p-Isopropyltoluene (p-Cymene)570 02/16/2023 202011350070-1303.0 20ND10 Methyl tertiary butyl ether (MTBE)530 02/16/2023 20209950070-1304.0 204210 4-Methyl-2-pentanone 1000 02/16/2023 2020101100070-1300.53 20ND10 Methylene chloride 480 02/16/2023 20209750070-1303.1 20ND10 Naphthalene 610 02/16/2023 202011650070-1304.1 203210 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 27 of 41 Volatile Organic Compounds by GC/MS - MSD Batch:Prep Method: Sample ID:YB08028-002MD 67751 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date% RPD %Rec Limit % RPD Limit Sample Amount Dil(ug/L)(ug/L)(ug/L) n-Propylbenzene 590 02/16/2023 202011450070-1302.6 201810 Styrene 510 02/16/2023 202010250070-1301.0 20ND10 1,1,1,2-Tetrachloroethane 490 02/16/2023 20209950070-1301.9 20ND10 1,1,2,2-Tetrachloroethane 480 02/16/2023 20209650070-1300.14 20ND10 Tetrachloroethene 530 02/16/2023 202010650070-1300.24 20ND10 Toluene 560 02/16/2023 202010850070-1302.6 201810 1,1,2-Trichloro-1,2,2-Trifluoroethane 560 02/16/2023 202011250070-1305.3 20ND10 1,2,3-Trichlorobenzene 490 02/16/2023 20209850070-1303.7 20ND10 1,2,4-Trichlorobenzene 510 02/16/2023 202010250070-1305.1 20ND10 1,1,1-Trichloroethane 520 02/16/2023 202010450070-1301.2 20ND10 1,1,2-Trichloroethane 500 02/16/2023 20209950070-1300.47 20ND10 Trichloroethene 530 02/16/2023 202010550070-1301.3 20ND10 Trichlorofluoromethane 720 02/16/2023 2020N14350060-1405.4 20ND10 1,2,3-Trichloropropane 510 02/16/2023 202010150070-1301.5 20ND10 1,3,5-Trimethylbenzene (Mesitylene)580 02/16/2023 202011550070-1301.1 204.6 10 1,2,4-Trimethylbenzene 590 02/16/2023 202011450070-1300.061 201510 m+p - Xylenes 620 02/16/2023 202011550070-1301.9 204210 o - Xylenes 550 02/16/2023 202011050070-1301.4 20ND10 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 94 70-130 Bromofluorobenzene 106 70-130 Toluene-d8 106 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 28 of 41 Volatile Organic Compounds by GC/MS - MB Batch:Prep Method: Sample ID:YQ67950-001 67950 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q LOQ DL Units Analysis DateDil Chloromethane (Methyl chloride)ND 02/19/2023 19480.50 0.40 ug/L1 Dichlorodifluoromethane ND 02/19/2023 19480.50 0.40 ug/L1 Vinyl chloride ND 02/19/2023 19480.50 0.40 ug/L1 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 111 70-130 Bromofluorobenzene 104 70-130 Toluene-d8 108 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 29 of 41 Volatile Organic Compounds by GC/MS - LCS Batch:Prep Method: Sample ID:YQ67950-002 67950 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec LimitDil(ug/L)(ug/L) Chloromethane (Methyl chloride)58 02/19/2023 18441155060-1401 Dichlorodifluoromethane 60 02/19/2023 18441205060-1401 Vinyl chloride 54 02/19/2023 18441085060-1401 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 95 70-130 Bromofluorobenzene 102 70-130 Toluene-d8 102 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 30 of 41 Volatile Organic Compounds by GC/MS - MB Batch:Prep Method: Sample ID:YQ68047-001 68047 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q LOQ DL Units Analysis DateDil Acetone ND 02/20/2023 2117104.0 ug/L1 Benzene ND 02/20/2023 21170.50 0.40 ug/L1 Bromobenzene ND 02/20/2023 21170.50 0.40 ug/L1 Bromochloromethane ND 02/20/2023 21170.50 0.40 ug/L1 Bromodichloromethane ND 02/20/2023 21170.50 0.40 ug/L1 Bromoform ND 02/20/2023 21170.50 0.40 ug/L1 Bromomethane (Methyl bromide)ND 02/20/2023 21170.50 0.40 ug/L1 2-Butanone (MEK)ND 02/20/2023 2117102.0 ug/L1 n-Butylbenzene ND 02/20/2023 21170.50 0.40 ug/L1 sec-Butylbenzene ND 02/20/2023 21170.50 0.40 ug/L1 tert-Butylbenzene ND 02/20/2023 21170.50 0.40 ug/L1 Carbon tetrachloride ND 02/20/2023 21170.50 0.40 ug/L1 Chlorobenzene ND 02/20/2023 21170.50 0.40 ug/L1 Chloroethane ND 02/20/2023 21170.50 0.40 ug/L1 Chloroform ND 02/20/2023 21170.50 0.40 ug/L1 Chloromethane (Methyl chloride)ND 02/20/2023 21170.50 0.40 ug/L1 2-Chlorotoluene ND 02/20/2023 21170.50 0.40 ug/L1 4-Chlorotoluene ND 02/20/2023 21170.50 0.40 ug/L1 Dibromochloromethane ND 02/20/2023 21170.50 0.40 ug/L1 1,2-Dibromoethane (EDB)ND 02/20/2023 21170.50 0.40 ug/L1 Dibromomethane (Methylene bromide)ND 02/20/2023 21170.50 0.40 ug/L1 1,2-Dichlorobenzene ND 02/20/2023 21170.50 0.40 ug/L1 1,3-Dichlorobenzene ND 02/20/2023 21170.50 0.40 ug/L1 1,4-Dichlorobenzene ND 02/20/2023 21170.50 0.40 ug/L1 Dichlorodifluoromethane ND 02/20/2023 21170.50 0.40 ug/L1 1,1-Dichloroethane ND 02/20/2023 21170.50 0.40 ug/L1 1,2-Dichloroethane ND 02/20/2023 21170.50 0.40 ug/L1 1,1-Dichloroethene ND 02/20/2023 21170.50 0.40 ug/L1 cis-1,2-Dichloroethene ND 02/20/2023 21170.50 0.40 ug/L1 trans-1,2-Dichloroethene ND 02/20/2023 21170.50 0.40 ug/L1 1,2-Dichloropropane ND 02/20/2023 21170.50 0.40 ug/L1 1,3-Dichloropropane ND 02/20/2023 21170.50 0.40 ug/L1 2,2-Dichloropropane ND 02/20/2023 21170.50 0.40 ug/L1 1,1-Dichloropropene ND 02/20/2023 21170.50 0.40 ug/L1 cis-1,3-Dichloropropene ND 02/20/2023 21170.50 0.40 ug/L1 trans-1,3-Dichloropropene ND 02/20/2023 21170.50 0.40 ug/L1 Diisopropyl ether (IPE)ND 02/20/2023 21170.50 0.40 ug/L1 Ethylbenzene ND 02/20/2023 21170.50 0.40 ug/L1 Hexachlorobutadiene ND 02/20/2023 21170.50 0.40 ug/L1 2-Hexanone ND 02/20/2023 2117102.0 ug/L1 Isopropylbenzene (Cumene)ND 02/20/2023 21170.50 0.40 ug/L1 p-Isopropyltoluene (p-Cymene)ND 02/20/2023 21170.50 0.40 ug/L1 Methyl tertiary butyl ether (MTBE)ND 02/20/2023 21170.50 0.40 ug/L1 4-Methyl-2-pentanone ND 02/20/2023 2117102.0 ug/L1 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 31 of 41 Volatile Organic Compounds by GC/MS - MB Batch:Prep Method: Sample ID:YQ68047-001 68047 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q LOQ DL Units Analysis DateDil Methylene chloride ND 02/20/2023 21170.50 0.40 ug/L1 Naphthalene ND 02/20/2023 21170.50 0.40 ug/L1 n-Propylbenzene ND 02/20/2023 21170.50 0.40 ug/L1 Styrene ND 02/20/2023 21170.50 0.40 ug/L1 1,1,1,2-Tetrachloroethane ND 02/20/2023 21170.50 0.40 ug/L1 1,1,2,2-Tetrachloroethane ND 02/20/2023 21170.50 0.40 ug/L1 Tetrachloroethene ND 02/20/2023 21170.50 0.40 ug/L1 Toluene ND 02/20/2023 21170.50 0.40 ug/L1 1,1,2-Trichloro-1,2,2-Trifluoroethane ND 02/20/2023 21170.50 0.40 ug/L1 1,2,3-Trichlorobenzene ND 02/20/2023 21170.50 0.40 ug/L1 1,2,4-Trichlorobenzene ND 02/20/2023 21170.50 0.40 ug/L1 1,1,1-Trichloroethane ND 02/20/2023 21170.50 0.40 ug/L1 1,1,2-Trichloroethane ND 02/20/2023 21170.50 0.40 ug/L1 Trichloroethene ND 02/20/2023 21170.50 0.40 ug/L1 Trichlorofluoromethane ND 02/20/2023 21170.50 0.40 ug/L1 1,2,3-Trichloropropane ND 02/20/2023 21170.50 0.40 ug/L1 1,3,5-Trimethylbenzene (Mesitylene)ND 02/20/2023 21170.50 0.40 ug/L1 1,2,4-Trimethylbenzene ND 02/20/2023 21170.50 0.40 ug/L1 Vinyl chloride ND 02/20/2023 21170.50 0.40 ug/L1 m+p - Xylenes ND 02/20/2023 21170.50 0.40 ug/L1 o - Xylenes ND 02/20/2023 21170.50 0.40 ug/L1 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 95 70-130 Bromofluorobenzene 101 70-130 Toluene-d8 104 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 32 of 41 Volatile Organic Compounds by GC/MS - LCS Batch:Prep Method: Sample ID:YQ68047-002 68047 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec LimitDil(ug/L)(ug/L) Acetone 160 02/20/2023 1809N15910070-1301 Benzene 48 02/20/2023 1809975070-1301 Bromobenzene 53 02/20/2023 18091055070-1301 Bromochloromethane 49 02/20/2023 1809985070-1301 Bromodichloromethane 48 02/20/2023 1809965070-1301 Bromoform 47 02/20/2023 1809945070-1301 Bromomethane (Methyl bromide)55 02/20/2023 18091095060-1401 2-Butanone (MEK)120 02/20/2023 180911910070-1301 n-Butylbenzene 57 02/20/2023 18091155070-1301 sec-Butylbenzene 59 02/20/2023 18091175070-1301 tert-Butylbenzene 59 02/20/2023 18091185070-1301 Carbon tetrachloride 48 02/20/2023 1809965070-1301 Chlorobenzene 50 02/20/2023 1809995070-1301 Chloroethane 58 02/20/2023 18091165060-1401 Chloroform 44 02/20/2023 1809885070-1301 Chloromethane (Methyl chloride)72 02/20/2023 1809N1445060-1401 2-Chlorotoluene 53 02/20/2023 18091065070-1301 4-Chlorotoluene 53 02/20/2023 18091075070-1301 Dibromochloromethane 50 02/20/2023 1809995070-1301 1,2-Dibromoethane (EDB)52 02/20/2023 18091035070-1301 Dibromomethane (Methylene bromide)50 02/20/2023 1809995070-1301 1,2-Dichlorobenzene 50 02/20/2023 1809995070-1301 1,3-Dichlorobenzene 50 02/20/2023 18091005070-1301 1,4-Dichlorobenzene 48 02/20/2023 1809965070-1301 Dichlorodifluoromethane 120 02/20/2023 1809N2405060-1401 1,1-Dichloroethane 47 02/20/2023 1809945070-1301 1,2-Dichloroethane 50 02/20/2023 1809995070-1301 1,1-Dichloroethene 51 02/20/2023 18091025070-1301 cis-1,2-Dichloroethene 47 02/20/2023 1809955070-1301 trans-1,2-Dichloroethene 47 02/20/2023 1809955070-1301 1,2-Dichloropropane 48 02/20/2023 1809975070-1301 1,3-Dichloropropane 51 02/20/2023 18091035070-1301 2,2-Dichloropropane 55 02/20/2023 18091105070-1301 1,1-Dichloropropene 49 02/20/2023 1809985070-1301 cis-1,3-Dichloropropene 53 02/20/2023 18091065070-1301 trans-1,3-Dichloropropene 48 02/20/2023 1809965070-1301 Diisopropyl ether (IPE)48 02/20/2023 1809965070-1301 Ethylbenzene 53 02/20/2023 18091055070-1301 Hexachlorobutadiene 58 02/20/2023 18091155070-1301 2-Hexanone 98 02/20/2023 18099810070-1301 Isopropylbenzene (Cumene)55 02/20/2023 18091105070-1301 p-Isopropyltoluene (p-Cymene)58 02/20/2023 18091175070-1301 Methyl tertiary butyl ether (MTBE)49 02/20/2023 1809985070-1301 4-Methyl-2-pentanone 100 02/20/2023 180910210070-1301 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 33 of 41 Volatile Organic Compounds by GC/MS - LCS Batch:Prep Method: Sample ID:YQ68047-002 68047 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec LimitDil(ug/L)(ug/L) Methylene chloride 45 02/20/2023 1809915070-1301 Naphthalene 62 02/20/2023 18091235070-1301 n-Propylbenzene 56 02/20/2023 18091135070-1301 Styrene 50 02/20/2023 18091005070-1301 1,1,1,2-Tetrachloroethane 50 02/20/2023 1809995070-1301 1,1,2,2-Tetrachloroethane 51 02/20/2023 18091015070-1301 Tetrachloroethene 51 02/20/2023 18091015070-1301 Toluene 53 02/20/2023 18091055070-1301 1,1,2-Trichloro-1,2,2-Trifluoroethane 52 02/20/2023 18091045070-1301 1,2,3-Trichlorobenzene 53 02/20/2023 18091065070-1301 1,2,4-Trichlorobenzene 54 02/20/2023 18091095070-1301 1,1,1-Trichloroethane 48 02/20/2023 1809965070-1301 1,1,2-Trichloroethane 49 02/20/2023 1809995070-1301 Trichloroethene 49 02/20/2023 1809985070-1301 Trichlorofluoromethane 60 02/20/2023 18091215060-1401 1,2,3-Trichloropropane 53 02/20/2023 18091075070-1301 1,3,5-Trimethylbenzene (Mesitylene)59 02/20/2023 18091185070-1301 1,2,4-Trimethylbenzene 58 02/20/2023 18091175070-1301 Vinyl chloride 67 02/20/2023 18091345060-1401 m+p - Xylenes 55 02/20/2023 18091095070-1301 o - Xylenes 55 02/20/2023 18091095070-1301 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 89 70-130 Bromofluorobenzene 101 70-130 Toluene-d8 100 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 34 of 41 Volatile Organic Compounds by GC/MS - MB Batch:Prep Method: Sample ID:YQ68276-001 68276 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q LOQ DL Units Analysis DateDil Acetone ND 02/22/2023 2044104.0 ug/L1 Benzene ND 02/22/2023 20440.50 0.40 ug/L1 Bromobenzene ND 02/22/2023 20440.50 0.40 ug/L1 Bromochloromethane ND 02/22/2023 20440.50 0.40 ug/L1 Bromodichloromethane ND 02/22/2023 20440.50 0.40 ug/L1 Bromoform ND 02/22/2023 20440.50 0.40 ug/L1 Bromomethane (Methyl bromide)ND 02/22/2023 20440.50 0.40 ug/L1 2-Butanone (MEK)ND 02/22/2023 2044102.0 ug/L1 n-Butylbenzene ND 02/22/2023 20440.50 0.40 ug/L1 sec-Butylbenzene ND 02/22/2023 20440.50 0.40 ug/L1 tert-Butylbenzene ND 02/22/2023 20440.50 0.40 ug/L1 Carbon tetrachloride ND 02/22/2023 20440.50 0.40 ug/L1 Chlorobenzene ND 02/22/2023 20440.50 0.40 ug/L1 Chloroethane ND 02/22/2023 20440.50 0.40 ug/L1 Chloroform ND 02/22/2023 20440.50 0.40 ug/L1 Chloromethane (Methyl chloride)ND 02/22/2023 20440.50 0.40 ug/L1 2-Chlorotoluene ND 02/22/2023 20440.50 0.40 ug/L1 4-Chlorotoluene ND 02/22/2023 20440.50 0.40 ug/L1 Dibromochloromethane ND 02/22/2023 20440.50 0.40 ug/L1 1,2-Dibromoethane (EDB)ND 02/22/2023 20440.50 0.40 ug/L1 Dibromomethane (Methylene bromide)ND 02/22/2023 20440.50 0.40 ug/L1 1,2-Dichlorobenzene ND 02/22/2023 20440.50 0.40 ug/L1 1,3-Dichlorobenzene ND 02/22/2023 20440.50 0.40 ug/L1 1,4-Dichlorobenzene ND 02/22/2023 20440.50 0.40 ug/L1 Dichlorodifluoromethane ND 02/22/2023 20440.50 0.40 ug/L1 1,1-Dichloroethane ND 02/22/2023 20440.50 0.40 ug/L1 1,2-Dichloroethane ND 02/22/2023 20440.50 0.40 ug/L1 1,1-Dichloroethene ND 02/22/2023 20440.50 0.40 ug/L1 cis-1,2-Dichloroethene ND 02/22/2023 20440.50 0.40 ug/L1 trans-1,2-Dichloroethene ND 02/22/2023 20440.50 0.40 ug/L1 1,2-Dichloropropane ND 02/22/2023 20440.50 0.40 ug/L1 1,3-Dichloropropane ND 02/22/2023 20440.50 0.40 ug/L1 2,2-Dichloropropane ND 02/22/2023 20440.50 0.40 ug/L1 1,1-Dichloropropene ND 02/22/2023 20440.50 0.40 ug/L1 cis-1,3-Dichloropropene ND 02/22/2023 20440.50 0.40 ug/L1 trans-1,3-Dichloropropene ND 02/22/2023 20440.50 0.40 ug/L1 Diisopropyl ether (IPE)ND 02/22/2023 20440.50 0.40 ug/L1 Ethylbenzene ND 02/22/2023 20440.50 0.40 ug/L1 Hexachlorobutadiene 0.98 02/22/2023 20440.50 0.40 ug/L1 2-Hexanone ND 02/22/2023 2044102.0 ug/L1 Isopropylbenzene (Cumene)ND 02/22/2023 20440.50 0.40 ug/L1 p-Isopropyltoluene (p-Cymene)ND 02/22/2023 20440.50 0.40 ug/L1 Methyl tertiary butyl ether (MTBE)ND 02/22/2023 20440.50 0.40 ug/L1 4-Methyl-2-pentanone ND 02/22/2023 2044102.0 ug/L1 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 35 of 41 Volatile Organic Compounds by GC/MS - MB Batch:Prep Method: Sample ID:YQ68276-001 68276 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q LOQ DL Units Analysis DateDil Methylene chloride ND 02/22/2023 20440.50 0.40 ug/L1 Naphthalene 0.44 02/22/2023 2044J0.50 0.40 ug/L1 n-Propylbenzene ND 02/22/2023 20440.50 0.40 ug/L1 Styrene ND 02/22/2023 20440.50 0.40 ug/L1 1,1,1,2-Tetrachloroethane ND 02/22/2023 20440.50 0.40 ug/L1 1,1,2,2-Tetrachloroethane ND 02/22/2023 20440.50 0.40 ug/L1 Tetrachloroethene ND 02/22/2023 20440.50 0.40 ug/L1 Toluene ND 02/22/2023 20440.50 0.40 ug/L1 1,1,2-Trichloro-1,2,2-Trifluoroethane ND 02/22/2023 20440.50 0.40 ug/L1 1,2,3-Trichlorobenzene ND 02/22/2023 20440.50 0.40 ug/L1 1,2,4-Trichlorobenzene ND 02/22/2023 20440.50 0.40 ug/L1 1,1,1-Trichloroethane ND 02/22/2023 20440.50 0.40 ug/L1 1,1,2-Trichloroethane ND 02/22/2023 20440.50 0.40 ug/L1 Trichloroethene ND 02/22/2023 20440.50 0.40 ug/L1 Trichlorofluoromethane ND 02/22/2023 20440.50 0.40 ug/L1 1,2,3-Trichloropropane ND 02/22/2023 20440.50 0.40 ug/L1 1,3,5-Trimethylbenzene (Mesitylene)ND 02/22/2023 20440.50 0.40 ug/L1 1,2,4-Trimethylbenzene ND 02/22/2023 20440.50 0.40 ug/L1 Vinyl chloride ND 02/22/2023 20440.50 0.40 ug/L1 m+p - Xylenes ND 02/22/2023 20440.50 0.40 ug/L1 o - Xylenes ND 02/22/2023 20440.50 0.40 ug/L1 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 97 70-130 Bromofluorobenzene 97 70-130 Toluene-d8 97 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 36 of 41 Volatile Organic Compounds by GC/MS - LCS Batch:Prep Method: Sample ID:YQ68276-002 68276 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec LimitDil(ug/L)(ug/L) Acetone 110 02/22/2023 193610610070-1301 Benzene 47 02/22/2023 1936945070-1301 Bromobenzene 51 02/22/2023 19361025070-1301 Bromochloromethane 48 02/22/2023 1936965070-1301 Bromodichloromethane 47 02/22/2023 1936945070-1301 Bromoform 52 02/22/2023 19361045070-1301 Bromomethane (Methyl bromide)48 02/22/2023 1936975060-1401 2-Butanone (MEK)100 02/22/2023 193610510070-1301 n-Butylbenzene 53 02/22/2023 19361075070-1301 sec-Butylbenzene 54 02/22/2023 19361085070-1301 tert-Butylbenzene 55 02/22/2023 19361095070-1301 Carbon tetrachloride 47 02/22/2023 1936935070-1301 Chlorobenzene 47 02/22/2023 1936945070-1301 Chloroethane 45 02/22/2023 1936905060-1401 Chloroform 44 02/22/2023 1936885070-1301 Chloromethane (Methyl chloride)46 02/22/2023 1936935060-1401 2-Chlorotoluene 49 02/22/2023 1936995070-1301 4-Chlorotoluene 52 02/22/2023 19361045070-1301 Dibromochloromethane 50 02/22/2023 19361005070-1301 1,2-Dibromoethane (EDB)51 02/22/2023 19361025070-1301 Dibromomethane (Methylene bromide)47 02/22/2023 1936945070-1301 1,2-Dichlorobenzene 49 02/22/2023 1936975070-1301 1,3-Dichlorobenzene 50 02/22/2023 19361015070-1301 1,4-Dichlorobenzene 46 02/22/2023 1936935070-1301 Dichlorodifluoromethane 51 02/22/2023 19361025060-1401 1,1-Dichloroethane 45 02/22/2023 1936915070-1301 1,2-Dichloroethane 46 02/22/2023 1936935070-1301 1,1-Dichloroethene 45 02/22/2023 1936915070-1301 cis-1,2-Dichloroethene 47 02/22/2023 1936945070-1301 trans-1,2-Dichloroethene 46 02/22/2023 1936935070-1301 1,2-Dichloropropane 47 02/22/2023 1936955070-1301 1,3-Dichloropropane 48 02/22/2023 1936965070-1301 2,2-Dichloropropane 46 02/22/2023 1936925070-1301 1,1-Dichloropropene 46 02/22/2023 1936925070-1301 cis-1,3-Dichloropropene 46 02/22/2023 1936935070-1301 trans-1,3-Dichloropropene 45 02/22/2023 1936905070-1301 Diisopropyl ether (IPE)50 02/22/2023 19361015070-1301 Ethylbenzene 51 02/22/2023 19361035070-1301 Hexachlorobutadiene 49 02/22/2023 1936985070-1301 2-Hexanone 96 02/22/2023 19369610070-1301 Isopropylbenzene (Cumene)53 02/22/2023 19361055070-1301 p-Isopropyltoluene (p-Cymene)55 02/22/2023 19361105070-1301 Methyl tertiary butyl ether (MTBE)49 02/22/2023 1936985070-1301 4-Methyl-2-pentanone 100 02/22/2023 193610410070-1301 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 37 of 41 Volatile Organic Compounds by GC/MS - LCS Batch:Prep Method: Sample ID:YQ68276-002 68276 SM 6200B-2011 Analytical Method:SM 6200B-2011 Matrix:Aqueous Parameter Result Q % Rec Spike Amount Analysis Date %Rec LimitDil(ug/L)(ug/L) Methylene chloride 43 02/22/2023 1936865070-1301 Naphthalene 45 02/22/2023 1936895070-1301 n-Propylbenzene 54 02/22/2023 19361085070-1301 Styrene 53 02/22/2023 19361055070-1301 1,1,1,2-Tetrachloroethane 49 02/22/2023 1936985070-1301 1,1,2,2-Tetrachloroethane 47 02/22/2023 1936945070-1301 Tetrachloroethene 50 02/22/2023 1936995070-1301 Toluene 50 02/22/2023 19361005070-1301 1,1,2-Trichloro-1,2,2-Trifluoroethane 45 02/22/2023 1936905070-1301 1,2,3-Trichlorobenzene 49 02/22/2023 1936985070-1301 1,2,4-Trichlorobenzene 51 02/22/2023 19361025070-1301 1,1,1-Trichloroethane 47 02/22/2023 1936945070-1301 1,1,2-Trichloroethane 47 02/22/2023 1936945070-1301 Trichloroethene 49 02/22/2023 1936985070-1301 Trichlorofluoromethane 49 02/22/2023 1936985060-1401 1,2,3-Trichloropropane 49 02/22/2023 1936975070-1301 1,3,5-Trimethylbenzene (Mesitylene)55 02/22/2023 19361105070-1301 1,2,4-Trimethylbenzene 55 02/22/2023 19361105070-1301 Vinyl chloride 46 02/22/2023 1936925060-1401 m+p - Xylenes 52 02/22/2023 19361035070-1301 o - Xylenes 53 02/22/2023 19361055070-1301 Surrogate Q % Rec Acceptance Limit 1,2-Dichloroethane-d4 90 70-130 Bromofluorobenzene 101 70-130 Toluene-d8 96 70-130 Note:Calculations are performed before rounding to avoid round-off errors in calculated results LOQ = Limit of Quantitation ND = Not detected at or above the DL J = Estimated result < LOQ and > DL N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40% + = RPD is out of criteria _DL = Detection Limit * = RSD is out of criteria QC Data for Lot Number: YB08028 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 38 of 41 Chain of Custody and Miscellaneous Documents 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 39 of 41 PACE ANALYTICAL SERVICES, LLC 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) Page 41 of 41