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Home My WebLink AboutWS-8952_44219_CA_NTCP_20240923Speedway, LLC 500 Speedway Drive Enon, Ohio 45323 Phone: (919) 516-8069 New Technology Cleanup Plan Former Speedway Store No. 6953/Former Wilco #154 3030 North Main Street High Point, Guilford County, North Carolina Incident No. 44219 Project No. 60688585 September 23, 2024 AECOM ii Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 Quality Information Prepared by Reviewed by Reviewed by Carter Paradis Geologist II Carter.paradis@aecom.com Adam Lee, PG Project Manager Adam.Lee1@aecom.com Peter Pecora Regional Senior Project Manager Peter.Pecora@aecom.com Prepared for: Speedway, LLC 500 Speedway Drive Enon, Ohio 45323 Phone: (937) 864-3000 Prepared by: AECOM Technical Services of North Carolina, Inc. 5438 Wade Park Boulevard, Suite 200 Raleigh, North Carolina 27607 Phone: (919) 461-1100 aecom.com Copyright © 2024 by AECOM All rights reserved. No part of this copyrighted work may be reproduced, distributed, or transmitted in any form or by any means without the prior written permission of AECOM. AECOM iii Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 Professional Certification Page I, Brett G. Schaefer, a Licensed Engineer for AECOM Technical Services of North Carolina, Inc., do certify that the information contained in this report is correct and accurate to the best of my knowledge. _________________________________ Brett G. Schaefer, PE AECOM Technical Services of North Carolina, Inc. AECOM Technical Services of North Carolina, Inc. is licensed to practice engineering in North Carolina. The certification number of the company or corporation is F-0458. AECOM iv Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 Table of Contents 1 Introduction .................................................................................................................................................. 1 2 Site Background Information......................................................................................................................... 2 2.1 Site Identification ............................................................................................................................... 2 2.2 Contact Information ........................................................................................................................... 2 2.3 Information about the Release ........................................................................................................... 2 3 Site History and Characterization .................................................................................................................. 3 3.1 Underground Storage Tank Systems .................................................................................................. 3 3.2 Aboveground Storage Tank Systems.................................................................................................. 3 3.3 Historical Releases ............................................................................................................................ 3 3.4 Site Characteristics ........................................................................................................................... 3 3.4.1 Zoning/Receptor Information ................................................................................................... 3 3.4.2 Site Geology and Hydrogeology .............................................................................................. 3 4 Receptor Information .................................................................................................................................... 4 4.1 Water Supply Wells ........................................................................................................................... 4 4.1.1 Private Water Supply Wells ..................................................................................................... 4 4.1.2 Public Water Systems ............................................................................................................. 4 4.2 Surface Water ................................................................................................................................... 4 4.3 Wellhead Protection Areas ................................................................................................................. 4 5 Summary of Remedial Activities Performed to Date ....................................................................................... 5 6 Proposed Alternative Remedial Method ........................................................................................................ 6 6.1 Selection of Remedial Technology...................................................................................................... 6 6.2 Applicability of Surfactant Enhanced MMPE Events ............................................................................ 6 7 Implementation of the Proposed Remediation Method ................................................................................... 7 7.1 Underground Injection Control Permit Acquisition ............................................................................... 7 7.2 Performing Surfactant Enhanced MMPE Events ................................................................................. 7 7.3 Costs for Implementation/Schedule .................................................................................................... 7 8 References .................................................................................................................................................. 8 AECOM v Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 Figures Figure 1:Site Location Map Figure 2:Site Plan Figure 3:Benzene Plume – Post-MMPE Event Tables Table 1:Site History – UST System and Other Release Information Table 2:Site History – UST Owner/Operator and Other Responsible Party Information Table 3:Well Construction and Historical Groundwater Elevations Table 4:Summary of Recent and Historical Groundwater Analytical Results Appendices Appendix A:IveySol#103 Brochure/Case Studies AECOM 1 Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 1 Introduction As required by the North Carolina Department of Environmental Quality (NCDEQ), AECOM Technical Services of North Carolina, Inc. (AECOM) on behalf of Speedway LLC (Speedway) has prepared this New Technology Cleanup Plan for former Speedway Store No. 6953 (Site), located at 3010 North Main Street, High Point, Guilford County, North Carolina.Figure 1 shows the Site location and Figure 2 details the site plan. The Speedway No. 6953 / WILCOHESS #154 facility (formerly Spanky’s One Stop) was moved to 3010 North Main Street, approximately 150 feet to the southeast. As part of the site closure activities, the underground storage tanks (USTs), product lines, dispensers, and canopy were removed from May through September 2013. Speedway is the responsible party for the environmental release from Incident No. 44219. On November 9, 2019, the Site was sold by Williams Properties II LLC to MacDonald Ventures, LLC. Currently, MacDonald Auto Sales operates an automotive dealership on-site. The Site is operational with an office building, former car wash, shed, and used car lot. In July 2013, petroleum-impacted soil was identified during the removal of the UST system, prompting a release report to county and state regulatory agencies. An incident number was assigned to the Site (Incident No. 44219). No historical releases or compliance issues are known prior to this release. Five steel USTs were removed from the Site in August 2013 – four 8,000-gallon gasoline USTs from one basin and one 8,000-gallon diesel UST from another basin. Each of the five USTs was 8 feet in diameter and 24 feet in length. A subsequent soil investigation dated August 2013, a Limited site Assessment (LSA) dated April 2015, and two Comprehensive Site Assessments (CSAs) dated August 2014 and April 2015, respectively, were conducted at the Site to confirm the extent of contamination. On May 14, 2015, NCDEQ issued a Notice of Regulatory Requirement (NORR) for a Corrective Action Plan (CAP). In addition, the Guilford County Department of Public Health and Environmental Risk Assessment (HERA) requested a CAP be prepared to evaluate strategies to reduce the petroleum constituent concentrations to below the Gross Contaminant Levels (GCLs) for groundwater. Speedway’s previous consultant, Simon & Associates of North Carolina, Inc. (Simon), prepared the CAP and submitted it to the HERA and NCDEQ on July 8, 2015. On August 10, 2015, NCDEQ issued a NORR approving the CAP that recommended quarterly monitored natural attenuation (MNA) activities be performed at the Site. These activities included monitoring and sampling monitoring wells at the Site to determine if the dissolved phase petroleum constituent concentrations will naturally attenuate over time. A mobile multi-phase extraction (MMPE) event was completed in July 2017 to assist in the reduction of groundwater contaminant concentrations in monitoring wells MW-1 and MW-3. The initial MNA quarterly report was submitted on November 30, 2015. A MMPE event was conducted from August 14 to August 18, 2023, by Advanced Environmental Services, Inc. (Advanced) under the supervision of AECOM field personnel. Monitoring wells MW-1 and MW-3 were used as extraction wells for the event. A total of 4,307 gallons of affected groundwater was recovered during the MMPE event. At the conclusion of the event, no light non-aqueous phase liquid (LNAPL) was measured in any of the vacuum wells or observation wells. Based on mass-removal calculations, an additional 571.88 pounds of vapor (92.96 gallons) phase hydrocarbons were removed during the MMPE event. Additionally, eight monitoring wells (MW-01, MW-02, MW-03, MW-04, MW-05, MW-06, MW-07, and MW-08) were gauged and two monitoring wells (MW-01 and MW-03) sampled by AECOM field staff on August 14 and 18, 2023. All reported contaminant concentrations were below the GCL except for benzene in monitoring well MW-01. LNAPL was not detected in any of the wells gauged on-site. On September 19, 2023, eight monitoring wells (MW-01, MW-02, MW-03, MW-04, MW-05, MW-06, MW-07, and MW- 08) were gauged, purged, and sampled by AECOM field staff. The groundwater samples were analyzed for Volatile Organic Compounds (VOCs) via Environmental Protection Agency (EPA) Method 6200B. All reported contaminant concentrations were below the GCL except for benzene in monitoring well MW-01. LNAPL was not detected in any of the wells gauged on-site. Based on the results, it was determined that there is a significant mass of contamination trapped in the soil and can be observed by quick rebound of detections following the MMPE event. In the 2015 CAP, monitored natural attenuation (MNA) was selected as the most cost-effective remedial option for the Site. It was estimated that within four to six years the concentration of benzene should be reduced below the GCL with this remedy. However, benzene concentrations continue to be detected at concentrations above the GCL in groundwater. In accordance with the CAP, AECOM, on behalf of Speedway, recommended the evaluation of more aggressive treatment options to enhance the MNA remedy. This New Technology Cleanup Plan (NTCP) has been prepared to evaluate a surfactant injection with subsequent MMPE events as an alternative remedial technology for the benzene plume onsite. AECOM 2 Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 2 Site Background Information The following sections provide site background and contact information. 2.1 Site Identification – Date of Incident Report:July 25, 2013 – Facility ID: 0-034426 Incident Number: 44219 – Site Rank:Intermediate – Site Name:Speedway Store No. 6953/Former Wilco #154 – Site Street Address:3030 North Main Street – City/Town: Conover Zip Code: 27265 County: Guilford – Description of Geographical Data Point (e.g., dispenser): Site Property – Location Method (global positioning system, topographical map, other): Google Earth – Latitude (decimal degrees): 35.999982° N, Longitude (decimal degrees): -80.035362° W 2.2 Contact Information UST Owner:Speedway, LLC Telephone: (937) 864-3000 Address:500 Speedway Drive Enon, Ohio 45323 UST Operator:Speedway, LLC Telephone: (937) 864-3000 Address:500 Speedway Drive Enon, Ohio 45323 Property Owner:MacDonald Ventures, LLC Telephone: Unknown Address:3705 Azalea Court High Point, NC Property Occupant:MacDonald Auto Sales Telephone: (336)-875-4074 Address:3030 N. Main Street, High Point, NC Consultant:AECOM Telephone: (919) 461-1100 Address:5438 Wade Park Boulevard, Suite 200 Raleigh, NC Analytical Laboratory: Pace Analytical Telephone: (704) 875-9092 State Certification No. 5342 Address:9800 Kincey Avenue # 100, Huntersville, NC 28078 2.3 Information about the Release On July 25, 2013, a release was discovered during the closure and removal of the UST system at the Site. Five steel underground storage tanks (USTs) were removed from the Site in August 2013 – four 8,000-gallon gasoline USTs from one basin and one 8,000-gallon diesel UST from another basin. Petroleum-impacted soil was identified during the removal of the UST system, prompting a release report to county and state regulatory agencies. The Site was issued Incident No. 44219. AECOM 3 Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 3 Site History and Characterization The following sections provide information on the USTs operated at the Site and follows the general outline established in Guidelines for Assessment and Corrective Action for UST Releases (NCDEQ, 2021a) and Guidelines for Site Checks, Tank Closure, and Initial Response and Abatement for UST Releases (NCDEQ, 2021b) using the Comprehensive Tables for Corrective Action Guidelines Tables (NCDEQ, 2022). 3.1 Underground Storage Tank Systems Five steel USTs were removed from the Site in August 2013 – four 8,000-gallon gasoline USTs from one basin and one 8,000-gallon diesel UST from another basin. The Site is currently in use as a used automotive dealership. UST system and other release information and UST owner/operator and other responsible party information are included in Tables 1 and 2, respectively. 3.2 Aboveground Storage Tank Systems No aboveground storage tank systems (ASTs) are currently present on site. Based on available information, no ASTs have historically been present at the Site. 3.3 Historical Releases No historical releases or compliance issues are known prior to the subject incident. 3.4 Site Characteristics The location of the Site is shown on a portion of the United States Geological Survey High Point West / Kernersville, NC (2022) digital raster graphic file (Figure 1). The layout of the Site Plan is found on Figure 2. The Site is located at 3030 North Main Street, High Point, NC, and is accessed from North Main Street, located west-southwest of the Site, and Northside Court, located east-northeast of the Site. The Site currently operates as a used automotive dealership, MacDonald Auto Sales. The Site is operational with an office building, former car wash, shed, and used car lot. Various commercial and residential properties surround the Site. 3.4.1 Zoning/Receptor Information The Site and adjoining properties are currently zoned Residential and Business (Guilford County GIS Viewer, 2023). An auto mall, a cigar shop, and a church are present west of the Site, across from North Main Street. East and north of the Site, across Northside Court, residential properties are located. A Speedway gas station is located south of the Site. 3.4.2 Site Geology and Hydrogeology Site geology was evaluated based on historic and current investigations completed by previous consultants and AECOM. The Site is located in the Piedmont Physiographic Province of North Carolina. The Site is underlain by crystalline, Paleozoic-age metamorphic rock. The shallow subsurface contains residual soil derived from in-situ weathering of bedrock, and the soil varies in thickness from non-existent at bedrock outcrops to depths of approximately 100 feet below ground surface (bgs) in areas of weathered bedrock. Soils underlying the site range from structureless soils (residuum) to soils with light relict rock features (saprolite), to partially weathered rock (found as a zone immediately above the parent bedrock). Based on past investigations by the previous consultant, soils at the Site consist mainly of brown, red and orange fine sandy and clayey silt. Groundwater is encountered at approximately 28.70 feet below ground surface (bgs). Based on the results of the September 2023 gauging event, groundwater flow is to the west/northwest, which is generally consistent with historical groundwater flow. Historical groundwater elevations are summarized on Table 3. AECOM 4 Former Speedway 6953 High Point, NCNew Technology Cleanup Plan September 2024 4 Receptor Information 4.1 Water Supply Wells A previous consultant, Simon, conducted a receptor survey in January 2015 as part of a LSA to identify the presence of water supply wells within a 1,500-foot radius from the Site. Within the LSA, the receptor survey is cited in the CSA report dated April 2015. 4.1.1 Private Water Supply Wells All residents of the City of High Point are required by law to be serviced by municipal water and are prohibited from using any pre-existing domestic water supply well according to a CSA report dated April 2015. All streets within 1,500 feet of the Site were field verified during the receptor survey as being serviced with public water utilities. 4.1.2 Public Water Systems The Site obtains water from the City of High Point, which gets its water supply from High Point Lake (also known as Oak Hollow Lake), approximately 1.5 miles east and topographically downgradient from the Site (High Point, 2021). 4.2 Surface Water No surface water was observed on the Site. No surface water bodies have been identified within 500 feet of the Site. The closest surface water bodies to the Site are Oak Hollow Lake – approximately 1.5 miles east of the Site – and several small tributaries to Rich Fork Creek, approximately 0.25 to 0.5 miles to the west of the Site. 4.3 Wellhead Protection Areas According to the NCDEQ Well Head Protection website (NCDEQ, 2023), last updated in October 2023, there are no approved wellhead protection plans located in Guilford County AECOM 5 5 Summary of Remedial Activities Performed to Date In July 2013, petroleum-impacted soil was identified during the removal of the UST system, prompting a release report to county and state regulatory agencies. An incident number was assigned to the Site (Incident No. 44219). No historical releases or compliance issues are known prior to this release. Five steel USTs were removed from the Site in August 2013 – four 8,000-gallon gasoline USTs from one basin and one 8,000-gallon diesel UST from another basin. Each of the five USTs was 8 feet in diameter and 24 feet in length. A subsequent soil investigation dated August 2013, a LSA dated April 2015, and two CSAs dated August 2014 and April 2015, respectively, were conducted at the Site to confirm the extent of contamination. On May 14, 2015, NCDEQ issued a NORR for a CAP. Speedway’s previous consultant, Simon, prepared the CAP recommending quarterly MNA activities and submitted it to the HERA and NCDEQ on July 8, 2015. These activities included monitoring and sampling monitoring wells at the Site to determine if the dissolved phase petroleum constituent concentrations will naturally attenuate over time. A mobile multi-phase extraction (MMPE) event was completed in July 2017 to assist in the reduction of groundwater contaminant concentrations in monitoring wells MW-1 and MW-3. The MMPE lasted 96 hours and generated 1,441 gallons of petroleum impacted groundwater. In addition, an estimated 32.25 pounds (5.16 gallons) of petroleum hydrocarbons were recovered as vapor during the MMPE event. Subsequent groundwater sampling indicated little to no reduction in benzene concentrations. In August 2023, Advanced Environmental Services Inc. (Advanced) was contracted by AECOM to conduct a 96-hour MMPE event to extract petroleum-impacted groundwater from monitoring wells MW-01 and MW-03. The stingers were set to a depth of 30 feet bgs in MW-01 and a depth of 29 feet bgs in monitoring well MW-03. The results of the MMPE event indicate that a total of 4,307 gallons of liquids were removed during the event. Of the total liquids extracted, no measurable LNAPL was recovered as liquid. Based on the mass removal calculations, an additional 571.88 pounds or 92.96 gallons of vapor phase hydrocarbons were removed. Semi-annual sampling was conducted following the August 2023 MMPE event. The results of the groundwater sampling indicated with there was little to no reduction in benzene concentrations. In a groundwater monitoring report submitted by AECOM on November 11, 2023, AECOM, on the behalf of Speedway, recommended the development of a new technology plan to enhance the reduction of benzene concentrations in groundwater. On May 15, 2024, Gene Mao of the Guilford County Health Department along with the NCDEQ Trust Fund approved the development of a new technology plan. AECOM 6 6 Proposed Alternative Remedial Method The benzene plume in the former gasoline USTs areas continue to impact the site with the most recent concentrations detected at 13,800 micrograms-per-liter (µg/L) during the September 19, 2023, groundwater sampling event. These measurements were collected 30 days following the MMPE on MW-1 and MW-3. Pre-MMPE LNAPL gauging from those wells indicated no detected LNAPL. The rebound detected following completion of the MMPE event indicated that MMPE alone is not a cost-effective form of remediation for the Site. Adding surfactant to the MMPE can aid with the recovery of benzene by making the dissolved benzene more miscible with the groundwater for ease of extraction. Figure 3 details the benzene plume 30 days after the August 2023 MMPE event and table 4 shows historical analytical at the Site and the rebound that occurred post MMPE. Further evaluation of the proposed remedy is discussed in the following sections. 6.1 Selection of Remedial Technology AECOM proposes using surfactant enhanced MMPE events to target each well containing measurable benzene above GCLs (MW-01). The proposed surfactant will be IveySol#103 which will be used in conjunction with MMPE events to increase benzene recovery by making the contaminant plume more readily available from sorbed material within the subsurface. By injecting the IveySol#103 directly into MW-01 and allowing a minimum of 12 hours of contact time. The contact time between the dissolved benzene and IveySol#103 will make the contaminants of concern more hydrophilic, thus allowing for easier recovery of dissolved benzene during the MMPE phase of the remediation event. Additional information related to IveySol#13 technology along with case studies is included as Appendix A. 6.2 Applicability of Surfactant Enhanced MMPE Events During the August 2023 MMPE event, 4,307 gallons of petroleum contact water and 0 gallons of LNAPL were recovered as liquid in 96 hours of operation. The addition of surfactant will increase the dissolved benzene miscibility allowing it to flow with the groundwater for easier recovery by vacuum extraction. The increased miscibility of the dissolved benzene within the smear zone and groundwater table may reduce the potential for rebound after the MMPE event is complete. Subsequent groundwater sampling events will monitor potential benzene rebound. Analysis of the data following the injection/MMPE activities will determine the need for additional enhanced or solo MMPE events. The advantages of performing Surfactant Enhanced MMPE Events:  IveySol#103 can increase the miscibility of trapped and free contaminants of concern for ease of recovery by vacuum extraction  The IveySol#103 injectate increases biodegradation of contaminants of concern within the groundwater, thus increasing in-situ biological remediation following injection activities.  MMPEs simultaneously remediate soil and groundwater within a monitoring well’s immediate vicinity reducing chances for benzene rebound.  Recovery of contaminants of concern may be greatly increased with the surfactant/MMPE combination. AECOM 7 7 Implementation of the Proposed Remediation Method 7.1 Underground Injection Control Permit Acquisition Upon approval of this NTCP AECOM, on behalf of Speedway, will request an Underground Injection Control (UIC) Permit and complete all required steps to receive the necessary approvals for injection of the IveySol#103 in the targeted monitoring wells. This will be required prior to the start of the proposed remediation activities. 7.2 Performing Surfactant Enhanced MMPE Events AECOM, on behalf of Speedway, and its subcontractor propose the following approach to addressing the LNAPL plumes onsite and will occur over a one-week period. Benzene Area Plume: Advanced will perform the IveySol#3 injection and the MMPE event on MW-1 and MW-3 over a four-day period. On day one Advanced with perform a MMPE event at MW-1 and MW-3. Prior to and following the initial MMPE, Advanced personnel will collect headspace readings and water levels at the extraction points. During MMPE activities, Advanced will isolate each extraction point to determine individual well volatile organic compound (VOC) yield. The goal is to regulate recovery to dewater the well point partially or completely (if groundwater or perched water is present) while maintaining vacuum and groundwater recovery from other extraction points (MW-1 primarily and MW-3 secondarily), while also maintaining maximum VOC recovery. On day two, IveySol#3 will be injected into monitoring wells MW-1 and MW-3. Approximately 1,250 gallons of 4 percent solution will be injected. An estimated 650 gallons into MW-1 and 600 gallons into MW-3. Following injection, Advanced will collect headspace readings. On day three, Advanced will conduct the second day of MMPE events concentrating efforts on the extraction points with the highest headspace measurements and highest VOC yield measured during the earlier MMPE activities. The MMPE will be run overnight. On the fourth day, Advanced will collected another round of VOC and ROI measurements from each extraction point. Following this, Advanced personnel will shut down the MMPE system and collect final water level and headspace measurements. Post-MMPE Event Comprehensive Groundwater Sampling Event: AECOM will perform a comprehensive groundwater sampling event approximately 30 days after the conclusion of the surfactant enhanced MMPE event. Data from all events will be evaluated, and analysis of the site activities will be provided in a groundwater monitoring report. 7.3 Costs for Implementation/Schedule AECOM has received a quote from Advanced Environmental Services, Inc. for the injection of IveySol#103 and MMPE event. Estimated costs for the Surfactant Enhanced MMPE event (including UIC Notice of Injection costs and a Corrective Action Performance Report) are $19,197. Subsequent post injection groundwater sampling activities are estimated to be $3,000. The total estimated cost to perform the above referenced work is $22,000. Upon approval of this NTCP AECOM, on behalf of Speedway, will complete a Pre-Approval Authorization Form for all costs associated with the proposed remediation event including costs for the UIC permit, subcontractor costs, and subsequent groundwater monitoring activities. AECOM will schedule the proposed remediation activities as soon as possible upon NC Trust Fund approval of this NTCP and acquisition of the UIC permit. The Guilford County Health Department Incident Manager shall be notified of the schedule of all activities. AECOM 8 8 References Conover, 2021. 2021 Annual Drinking Water Quality Report, City of Conover, https://www.conovernc.gov/vertical/sites/%7BBAB0D760-E669-4331-9C22- 9FB14833B6B9%7D/uploads/2021_Annual_Drinking_Water_Quality_Report_-_____.pdf, accessed September 29, 2022. Mid-Atlantic Associates, 2008. Phase II LSA Report. May 15, 2008. Mid-Atlantic Associates, 2015. New Technology Cleanup Plan. December 22, 20215. Mid-Atlantic Associates, 2018. Corrective Action Plan. September 25, 2018. Mid-Atlantic Associates, 2022. Groundwater Monitoring Report. February 27, 2022. NCDEQ, 2021a. UST Section Assessment Guidelines. effective January 19, 2021. NCDEQ, 2021b. UST Section Corrective Action Guidelines. effective January 19, 2021. NCDEQ, 2021c. Guidelines for Site Checks, Tank Closure, and Initial Response and Abatement for UST Releases. Change 11, effective May 17, 2021. NCDEQ, 2022. Comprehensive Tables for Corrective Action Guidelines Tables. Effective September 7, 2022. Figures 2,0002,000 N SITE LOCATION I. DUMITRU 60688585 FIGURE 1SITE LOCATION MAP Source: Topo USGS 7.5 Minute Topographic Map Quadrangles: High Point West / Kernersville, NC Copyright: 2022 National Geographic Society DATE:DRAWN BY:REVIEWED BY:PROJECT NO.:Fil e : C : \ C o n f i d e n t i a l \ A E C O M \ 7 - E l e v e n \ S i t e s F o l d e r s \ N o r t h C a r o l i n a \ 6 9 5 3 H i g h P o i n t \ 6 9 5 3 H i g h P o i n t . d w g L a y o u t : S i t e L o c a t i o n M a p D a t e : 0 8 D e c , 2 0 2 2 X r e f s : 00 SCALE IN FEET: NOTE: ALL MAP FEATURES ARE APPROXIMATE IN SCALE AND LOCATION. NOVEMBER 2023 A. LEE Former Speedway Store #6953 3030 North Main Street High Point, North Carolina Speedway LLC. © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS MW-1 Former Speedway Store #6953 Former Car Wash Former Canopy & Dispenser Islands Former Diesel UST Area Former Gasoline USTs Area MW-2 MW-3 MW-6 MW-4 MW-5 MW-8 MW-7 Residential Residential Residential Commercial Commercial Sh e d N o r t h M a i n S t r e e t N o r t h s i d e C o u r t SCALE IN FEET: 30 300 DATE:DRAWN BY:REVIEWED BY:PROJECT NO.: C: \ U s e r s \ A l e x a n d r u I o n u t . D u m i t \ A E C O M \ C o n v e n i e n c e S t o r e - 7 - E l e v e n \ N o r t h C a r o l i n a \ 6 9 5 3 H i g h P o i n t \ 6 9 5 3 H i g h P o i n t . d w g , 2/ 7 / 2 0 2 3 4 : 5 9 P M , Du m i t r u , I o n u t , PD F 9 9 5 . p c 3 , Us e r 3 2 7 6 7 , 1'- 0 " = 1 ' - 0 " N NOVEMBER 2023 I. DUMITRU A. LEE FIGURE 2 SITE PLAN LEGEND NOTE: ALL MAP FEATURES ARE APPROXIMATE IN SCALE AND LOCATION. Former Speedway Store #6953 3030 North Main Street High Point, North Carolina 60688585 Speedway LLC. Approximate Property Boundary Former Product Dispenser Former Underground Storage Tank Utility Pole / Power Pole Light Post / Traffic Light Catch Basin / Stormwater Inlet Overhead Wire Monitoring Well Former Speedway Store #6953 Former Car Wash Former Canopy & Dispenser Islands Former Diesel UST Area Former Gasoline USTs Area N o r t h M a i n S t r e e t N o r t h s i d e C o u r t MW-1 MW-6 MW-4 MW-5 MW-8 MW-7 Residential Residential Residential Commercial Commercial Sh e d MW-2 MW-3 SCALE IN FEET: 30 300 DATE:DRAWN BY:REVIEWED BY:PROJECT NO.:C: \ U s e r s \ A l e x a n d r u I o n u t . D u m i t \ A E C O M \ C o n v e n i e n c e S t o r e - 7 - E l e v e n \ N o r t h C a r o l i n a \ 6 9 5 3 H i g h P o i n t \ 6 9 5 3 H i g h P o i n t . d w g , 9/ 1 7 / 2 0 2 4 4 : 0 9 P M , Du m i t r u , I o n u t , PD F 9 9 5 . p c 3 , Us e r 3 2 7 6 7 , 1'- 0 " = 1 ' - 0 " N I. DUMITRUSEPTEMBER 2024 M. LINK FIGURE 3 BENZENE PLUME - POST-MMPE EVENT LEGEND NOTE: ALL MAP FEATURES ARE APPROXIMATE IN SCALE AND LOCATION. Former Speedway Store #6953 3030 North Main Street High Point, North Carolina 60688585 Speedway LLC. Approximate Property Boundary Former Product Dispenser Former Underground Storage Tank Utility Pole / Power Pole Light Post / Traffic Light Catch Basin / Stormwater Inlet Overhead Wire Monitoring Well 13,800<0.50 2.8 1,800 <6.2 <0.50 <0.50 0.59 10,0 0 0 5,0 0 0 Benzene Isoconcentration (µg/L)13,800 Benzene Isoconcentration Contour in µg/L (Dashed Where Inferred) 1,000 µg/L Micrograms per Liter Tables UST ID Number Capacity (gallons)Date Installed Construction Details Tank Dimensions Status of UST Release associated with the UST System Incident Number Material Released Date of Incident Date Reported 44219 Unknown 7/25/2013 7/25/2013 Description of Release(s) Release discovered during UST closure/removal onsite. No historical releases or compliance issues known prior to Incident 44219. Permanently Closed as of 8/2/2013 Yes 5 Diesel 8,000 1/1/1984 Single Wall Steel/FRP 8 feet diameter X 24 feet length Permanently Closed as of 8/2/2013 Yes 4 Non-Ethanol Gasoline 8,000 1/1/1977 Single Wall Steel/FRP 8 feet diameter X 24 feet length Yes 3 Premium Unleaded Gasoline 8,000 1/1/1977 Single Wall Steel/FRP 8 feet diameter X 24 feet length Permanently Closed as of 8/2/2013 Yes 8 feet diameter X 24 feet length Permanently Closed as of 8/2/2013 Yes 2 Regular Unleaded Gasoline 8,000 1/1/1977 Single Wall Steel/FRP 8 feet diameter X 24 feet length Permanently Closed as of 8/2/2013 Single Wall Steel/FRP Current 1 Regular Unleaded Gasoline 8,000 1/1/1977 INCIDENT NO. 44219 TABLE 1 SITE HISTORY - UST SYSTEM AND OTHER RELEASE INFORMATION SPEEDWAY #6953 / FORMER WILCOHESS #154 3030 NORTH MAIN STREET HIGH POINT, GUILFORD COUNTY, NORTH CAROLINA Page 1 of 1 UST ID Number 0-032388 Facility ID Number 00-0-000-017899* City State Zip Telephone Number Enon Ohio 45323 (800) 643-1948 City State Zip Telephone Number Winston-Salem NC 27105 (336) 767-6280 Incident Number NA Date Incident Occurred NA Date Incident Reported NA Date Incident Closed NA City State Zip Telephone Number NA NA NA NA Notes: * Facility ID number from NCDEQ Incident Map NA - Not Applicable, no other release of incident is associated with this UST system prior to Incident No. 44219 Other Incidents Onsite or Comingled/In Close Proximity Name of Responsible Party for Other Incident NA Street Address NA 5446 University Parkway (Former) UST Owner Name (and Contact)Dates of Ownership / Operation Speedway, LLC 1975 to August 2013 Street Address 500 Speedway Drive Operator Name (and Contact)Dates of Operation WilcoHess, LLC January 1975 to August 2013 Street Address INCIDENT NO. 44219 TABLE 2 SITE HISTORY - UST OWNER/OPERATOR AND OTHER RESPONSIBLE PARTY INFORMATION SPEEDWAY #6953 / FORMER WILCOHESS #154 3030 NORTH MAIN STREET HIGH POINT, GUILFORD COUNTY, NORTH CAROLINA Page 1 of 1 Well ID Measured Total Well Depth (feet bgs) Screened Interval (feet bgs) Top of Casing Elevation (feet bgs) Depth to Groundwater (feet bgs) LNAPL Thickness (feet) Groundwater Elevation (feet bgs) Comments 1/8/2014 29.44 ND 965.57 6/6/2014 27.27 ND 967.74 10/13/2015 29.65 ND 965.36 3/9/2016 28.07 ND 966.94 5/24/2016 27.68 ND 967.33 9/1/2016 27.62 ND 967.39 3/15/2017 29.48 ND 965.53 7/17/2017 28.99 ND 966.02 7/21/2017 30.91 ND 964.10 10/9/2017 29.60 ND 965.41 4/4/2018 29.90 ND 965.11 10/3/2018 29.53 ND 965.48 9/9/2019 26.45 ND 968.56 10/3/2019 27.23 ND 967.78 3/4/2021 24.81 ND 970.20 11/4/2021 26.70 ND 968.31 4/28/2022 26.90 ND 968.11 11/14/2022 28.35 ND 966.66 8/14/2023 26.85 ND 968.16 Prior to MMPE 8/18/2023 29.74 ND 965.27 Last day of MMPE 9/19/2023 28.49 ND 966.52 GW Sampling 6/6/2014 27.41 ND 966.75 10/13/2015 29.09 ND 965.07 3/9/2016 27.38 ND 966.78 5/24/2016 26.99 ND 967.17 9/1/2016 26.96 ND 967.20 3/15/2017 28.77 ND 965.39 7/17/2017 28.85 ND 965.31 7/21/2017 28.99 ND 965.17 10/9/2017 28.90 ND 965.26 4/4/2018 29.24 ND 964.92 10/3/2018 28.87 ND 965.29 9/9/2019 26.14 ND 968.02 10/3/2019 26.47 ND 967.69 3/4/2021 24.13 ND 970.03 11/4/2021 25.85 ND 968.31 4/28/2022 26.15 ND 968.01 11/14/2022 27.30 ND 966.86 8/14/2023 26.15 ND 968.01 Prior to MMPE 8/18/2023 27.33 ND 966.83 Last day of MMPE 9/19/2023 27.83 ND 966.33 GW Sampling 6/6/2014 27.77 ND 967.57 10/13/2015 28.13 ND 967.21 3/9/2016 26.55 ND 968.79 5/24/2016 26.14 ND 969.20 9/1/2016 26.08 ND 969.26 3/15/2017 27.89 ND 967.45 7/17/2017 27.40 ND 967.94 7/21/2017 29.73 ND 965.61 10/9/2017 28.00 ND 967.34 4/4/2018 28.39 ND 966.95 10/3/2018 29.97 ND 965.37 9/9/2019 25.30 ND 970.04 10/3/2019 25.60 ND 969.74 3/4/2021 23.70 ND 971.64 11/4/2021 24.70 ND 970.64 4/28/2022 25.20 ND 970.14 11/14/2022 26.80 ND 968.54 8/14/2023 25.17 ND 970.17 Prior to MMPE 8/18/2023 27.88 ND 967.46 Last day of MMPE 9/19/2023 25.89 ND 969.45 GW Sampling INCIDENT NO. 44219 TABLE 3 WELL CONSTRUCTION AND HISTORICAL GROUNDWATER ELEVATIONS SPEEDWAY #6953 / FORMER WILCOHESS #154 3030 NORTH MAIN STREET HIGH POINT, GUILFORD COUNTY, NORTH CAROLINA MW-01 40 15-40 995.01 MW-02 40 15-40 994.16 MW-03 40 15-40 995.34 Page 1 of 3 Well ID Measured Total Well Depth (feet bgs) Screened Interval (feet bgs) Top of Casing Elevation (feet bgs) Depth to Groundwater (feet bgs) LNAPL Thickness (feet) Groundwater Elevation (feet bgs) Comments HIGH POINT, GUILFORD COUNTY, NORTH CAROLINA 6/6/2014 30.12 ND 965.64 10/13/2015 31.64 ND 964.12 3/9/2016 30.49 ND 965.27 5/24/2016 30.03 ND 965.73 9/1/2016 30.09 ND 965.67 3/15/2017 32.00 ND 963.76 7/17/2017 31.29 ND 964.47 7/21/2017 31.40 ND 964.36 10/9/2017 32.21 ND 963.55 4/4/2018 32.52 ND 963.24 10/3/2018 32.33 ND 963.43 9/9/2019 29.59 ND 966.17 10/3/2019 29.87 ND 965.89 3/4/2021 27.71 ND 968.05 11/4/2021 29.30 ND 966.46 4/28/2022 29.60 ND 966.16 11/14/2022 31.05 ND 964.71 8/14/2023 29.62 ND 966.14 Prior to MMPE 8/18/2023 30.10 ND 965.66 Last day of MMPE 9/19/2023 30.18 ND 965.58 GW Sampling 6/6/2014 29.56 ND 965.35 10/13/2015 31.30 ND 963.61 3/9/2016 29.97 ND 964.94 5/24/2016 29.56 ND 965.35 9/1/2016 29.52 ND 965.39 3/15/2017 31.33 ND 963.58 7/17/2017 30.84 ND 964.07 7/21/2017 30.86 ND 964.05 10/9/2017 31.52 ND 963.39 4/4/2018 31.84 ND 963.07 10/3/2018 31.63 ND 963.28 9/9/2019 28.98 ND 965.93 10/3/2019 29.28 ND 965.63 3/4/2021 26.91 ND 968.00 11/4/2021 28.70 ND 966.21 4/28/2022 28.85 ND 966.06 11/14/2022 NM ND NM 8/14/2023 28.99 ND 965.92 Prior to MMPE 8/18/2023 29.11 ND 965.80 Last day of MMPE 9/19/2023 29.63 ND 965.28 GW Sampling 4/3/2015 28.64 ND 966.16 10/13/2015 30.00 ND 964.80 3/9/2016 28.59 ND 966.21 5/24/2016 NM ND NM 9/1/2016 28.18 ND 966.62 3/15/2017 29.77 ND 965.03 7/17/2017 29.53 ND 965.27 7/21/2017 30.00 ND 964.80 10/9/2017 30.13 ND 964.67 4/4/2018 30.44 ND 964.36 10/3/2018 30.14 ND 964.66 9/9/2019 27.46 ND 967.34 10/3/2019 27.82 ND 966.98 3/4/2021 25.65 ND 969.15 11/4/2021 28.70 ND 966.10 4/28/2022 27.50 ND 967.30 11/14/2022 NM ND NM 8/14/2023 27.55 ND 967.25 Prior to MMPE 8/18/2023 28.24 ND 966.56 Last day of MMPE 9/19/2023 28.20 ND 966.60 GW Sampling MW-04 40 15-40 995.76 MW-05 40 15-40 994.91 MW-06 60 50-60 994.80 Page 2 of 3 Well ID Measured Total Well Depth (feet bgs) Screened Interval (feet bgs) Top of Casing Elevation (feet bgs) Depth to Groundwater (feet bgs) LNAPL Thickness (feet) Groundwater Elevation (feet bgs) Comments HIGH POINT, GUILFORD COUNTY, NORTH CAROLINA 4/3/2015 34.01 ND 961.03 10/13/2015 32.20 ND 962.84 3/9/2016 30.91 ND 964.13 5/24/2016 NM ND NM 9/1/2016 30.48 ND 964.56 3/15/2017 32.19 ND 962.85 7/17/2017 31.88 ND 963.16 7/21/2017 31.82 ND 963.22 10/9/2017 32.34 ND 962.70 4/4/2018 32.70 ND 962.34 10/3/2018 32.51 ND 962.53 9/9/2019 30.16 ND 964.88 10/3/2019 30.13 ND 964.91 3/4/2021 27.80 ND 967.24 11/4/2021 29.49 ND 965.55 4/28/2022 29.65 ND 965.39 11/14/2022 NM ND NM 8/14/2023 29.85 ND 965.19 Prior to MMPE 8/18/2023 30.17 ND 964.87 Last day of MMPE 9/19/2023 29.39 ND 965.65 GW Sampling 4/3/2015 31.62 ND 962.84 10/13/2015 31.81 ND 962.65 3/9/2016 30.50 ND 963.96 5/24/2016 NM ND NM 9/1/2016 30.10 ND 964.36 3/15/2017 31.80 ND 962.66 7/17/2017 31.39 ND 963.07 7/21/2017 31.40 ND 963.06 10/9/2017 32.00 ND 962.46 4/4/2018 32.31 ND 962.15 10/3/2018 32.07 ND 962.39 9/9/2019 29.62 ND 964.84 10/3/2019 29.75 ND 964.71 3/4/2021 27.41 ND 967.05 11/4/2021 28.85 ND 965.61 4/28/2022 29.23 ND 965.23 11/14/2022 NM ND NM 8/14/2023 29.63 ND 964.83 Prior to MMPE 8/18/2023 39.88 ND 954.58 Last day of MMPE 9/19/2023 29.99 ND 964.47 GW Sampling Notes: bgs - below ground surface GW - Groundwater MMPE - Mobile Multi-Phase Extraction NM - Not Measured Recent Data - Highlighted in Blue Groundwater Elevation Data dated prior to the November 14, 2022 sampling event comes from Monitored Natural Attenuation Report No. 12, ATC Associates of North Carolina, Dated June 1, 2022 ND - Not detected MW-07 50 40-50 995.04 MW-08 40 30-40 994.46 Page 3 of 3 5,000 260,000 80,000 50,000 NE 20,000 6,000 400 50 70,000 5,900 70,000 30,500 26,100 70,000 28,500 24,100 1/8/2014 24,400 18,100 2,980 16,300 61,780 15,100 818 364 231 969 NR NR NR NR NR NR NR 6/6/2014 23,800 18,200 3,280 18,070 63,350 10,300 821 167 258 806 NR NR NR NR NR NR NR 4/3/2015 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/13/2015 16,500 9,930 2,730 15,910 45,070 1,660 <1,250 <250 <250 <294 NR NR NR NR NR NR NR 3/9/2016 19,600 14,300 3,480 17,260 54,640 1,550 706 <50 242 364 NR NR NR NR NR NR NR 5/24/2016 18,000 15,400 3,130 17,720 54,250 1,280 626 <100 210 324 NR NR NR NR NR NR NR 9/1/2016 18,800 13,900 4,090 21,600 58,390 867 855 <20 NR 150 NR NR NR NR NR NR NR 3/15/2017 17,200 10,200 3,070 16,000 46,470 1,730 845 <100 NR 298 NR NR NR NR NR NR NR 10/9/2017 22,200 14,600 4,120 21,800 62,720 1,600 <1,250 <250 NR 339 NR NR NR NR NR NR NR 4/4/2018 29,100 15,100 3,780 21,100 69,080 2,490 1,330 <250 NR 511 NR NR NR NR NR NR NR 10/3/2018 19,200 10,000 3,750 20,600 53,550 1,910 1,010 <90.2 NR 280 NR NR NR NR NR NR NR 9/9/2019 15,600 4,870 3,710 19,800 43,980 1,980 837J <90.2 NR 327 NR NR NR NR NR NR NR 3/4/2021 11,400 4,110 1,850 8,370 25,730 793 461J 50.6J NR 241 NR NR NR NR NR NR NR 11/4/2021 15,200 4,370 2,810 16,000 38,380 1,010 712 <100 NR 291 NR NR NR NR NR NR NR 4/28/2022 18,300 6,520 3,270 16,900 44,990 1,020 644 62 103 265 NR NR NR NR NR NR NR 11/14/2022 17,800 6,990 2,970 15,700 43,460 994 758 <62.5 <62.5 284 73 89.4 112 301 65.7 2,360 516 8/14/2023 16,700 7,250 2,760 14,200 40,910 814 719 < 62.5 < 62.5 260 < 62.5 75 105 270 < 62.5 2,030 492 8/18/2023 8,590 732 1,150 3,370 13,842 1,700 455 < 50.0 < 50.0 349 < 50.0 < 50.0 102 150 < 50.0 722 187 9/19/2023 13,800 5,250 2,830 15,910 37,790 892 738 < 50.0 < 50.0 230 < 50.0 52.5 124 303 91.5 2,550 570 1/8/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 6/6/2014 4,860 297 281 1,099 6,537 2,540 26.6 90.9 <0.50 254 NR NR NR NR NR NR NR 4/3/2015 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/13/2015 5,710 1,560 1,870 5,790 14,930 1,700 411 42.6 15.6 188 NR NR NR NR NR NR NR 3/9/2016 3,390 775 1,190 4,521 9,876 1,030 <250 <1.0 15.2 132 NR NR NR NR NR NR NR 5/24/2016 3,750 793 1,450 5,750 11,743 981 257 28.5 <25 133 NR NR NR NR NR NR NR 9/1/2016 3,780 886 1,480 5,150 11,296 722 310 <5 NR 87 NR NR NR NR NR NR NR 3/15/2017 2,640 639 1,030 3,530 7,839 1,000 320 27 NR 116 NR NR NR NR NR NR NR 10/9/2017 3,600 459 1,610 3,750 9,419 1,000 287 30.5 NR 128 NR NR NR NR NR NR NR 4/4/2018 3,180 459 1,610 3,750 8,999 1,000 287 30.5 NR 128 NR NR NR NR NR NR NR 10/3/2018 3,050 83 1,210 728 5,071 850 276 23.2 NR 114 NR NR NR NR NR NR NR 9/9/2019 377 <20.6 181 <53 558 284 <50 <18 NR 58.5 NR NR NR NR NR NR NR 3/4/2021 18.9 8.46 7.79 20.3 55.45 50.7 14.2 2.8 NR 19 NR NR NR NR NR NR NR 11/4/2021 5.08 0.588 J 8.25 0.808 J 14.726 111 <5 5.51 NR 32.5 NR NR NR NR NR NR NR 4/28/2022 4 <1.0 9.44 0.316 J 13.756 164 <5 6.4 0.0334 25 NR NR NR NR NR NR NR 11/14/2022 3.7 <0.50 7.7 <1.0 11.4 157 <2.0 5.3 <0.50 30.2 4.1 1.2 27.3 7.4 <0.50 <0.50 <0.50 9/19/2023 2.8 < 0.50 1.5 < 1.5 4.3 59.7 < 2.0 2.3 < 0.50 14.9 2.3 < 0.50 16 3.9 < 0.50 < 0.50 < 0.50 MT B E N a p h t h a l e n e Be n z e n e To l u e n e Eth y l b e n z e n e To t a l X y l e n e s To t a l B T E X n- P r o p y l b e n z e n e St y r e n e 1,2 , 4 - Tr i m e t h y l b e n z e n e 1,3 , 5 - Tr i m e t h y l b e n z e n e GCL (μg/l) 1,2 - D i c h l o r o e t h a n e (D C A ) 1,2 - D i b r o m o e t h a n e (E D B ) Is o p r o p y l e t h e r ( I P E ) n-B u t y l b e n z e n e Ch l o r o f o r m Is o p r o p y l b e n z e n e (c u m e n e ) Well ID Date Sampled Chemicals of Concern (μg/l) MW-01 MW-02 Page 1 of 4 5,000 260,000 80,000 50,000 NE 20,000 6,000 400 50 70,000 5,900 70,000 30,500 26,100 70,000 28,500 24,100 MT B E N a p h t h a l e n e Be n z e n e To l u e n e Eth y l b e n z e n e To t a l X y l e n e s To t a l B T E X n- P r o p y l b e n z e n e St y r e n e 1,2 , 4 - Tr i m e t h y l b e n z e n e 1,3 , 5 - Tr i m e t h y l b e n z e n e GCL (μg/l) 1,2 - D i c h l o r o e t h a n e (D C A ) 1,2 - D i b r o m o e t h a n e (E D B ) Is o p r o p y l e t h e r ( I P E ) n-B u t y l b e n z e n e Ch l o r o f o r m Is o p r o p y l b e n z e n e (c u m e n e ) Well ID Date Sampled Chemicals of Concern (μg/l) 1/8/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 6/6/2014 7,000 589 376 645 8,610 20,000 89.7 141 <0.50 641 NR NR NR NR NR NR NR 4/3/2015 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/13/2015 8,520 6,050 1,750 8,910 25,230 26.2 <1,250 <250 <250 918 NR NR NR NR NR NR NR 3/9/2016 10,900 7,070 1,940 9,800 29,710 24,900 <1,250 <250 <250 1,090 NR NR NR NR NR NR NR 5/24/2016 9,080 10,900 1,910 13,060 34,950 18,700 <1,000 <200 <200 828 NR NR NR NR NR NR NR 9/1/2016 10,100 12,100 2,390 12,900 37,490 16,300 887 <20 NR 569 NR NR NR NR NR NR NR 3/15/2017 8,610 7,440 1,890 10,600 28,540 13,200 795 <100 NR 686 NR NR NR NR NR NR NR 10/9/2017 10,200 3,290 2,040 9,590 25,120 15,600 1,170 103 NR 731 NR NR NR NR NR NR NR 4/4/2018 9,640 814 1,260 4,380 16,094 21,500 <2,500 <500 NR 868 NR NR NR NR NR NR NR 10/3/2018 7,990 311 1,590 4,880 14,771 13,600 808 <180 NR 577 NR NR NR NR NR NR NR 9/9/2019 2,200 30.1 85.1 J 2,640 4,955.2 6,830 200 J 46.5 NR 306 NR NR NR NR NR NR NR 3/4/2021 4,690 427 1,110 1,290 7,517 12,100 697 82.5 J NR 466 NR NR NR NR NR NR NR 11/4/2021 3,950 <100 1,110 575 5,635 9,170 595 69.5 J NR 463 NR NR NR NR NR NR NR 4/28/2022 2,630 <100 992 225 J 3,847 11,900 355 J <100 0.331 358 NR NR NR NR NR NR NR 11/14/2022 1,550 <50 794 138 2,482 10,800 392 <50.0 <50.0 411 <50.0 <50.0 67.7 129 <50.0 253 109 8/14/2023 1,610 < 25.0 966 218 2,794 8,730 552 58.8 < 25.0 400 35.1 < 25.0 80.6 151 < 25.0 244 116 8/18/2023 878 16.8 391 215.5 1,501.3 4,240 220 47.2 < 12.5 223 < 12.5 < 12.5 45.8 60.3 < 12.5 67.7 20.2 9/19/2023 1,800 26.3 860 538 3,224.3 4,710 356 40.9 < 20.0 221 23.9 < 20.0 59.7 112 < 20.0 277 93.6 1/8/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 6/6/2014 3 <1.0 <1.0 <2.0 3 183 <2.0 1.5 <1.0 38.6 NR NR NR NR NR NR NR 4/3/2015 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/13/2015 <1.0 <5.0 <1.0 <2.0 NE <1.0 <5.0 <1.0 <1.0 1.83 NR NR NR NR NR NR NR 3/9/2016 <1.0 <5.0 <1.0 <2.0 NE <1.0 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 5/24/2016 <1.0 <5.0 <1.0 <2.0 NE <1.0 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 9/1/2016 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/15/2017 <1 <1 <1 <3 NE <1 <5 <1 NR <1 NR NR NR NR NR NR NR 10/9/2017 <1 <1 <1 <3 NE <1 <5 <1 NR <1 NR NR NR NR NR NR NR 4/4/2018 <1 <1 <1 <3 NE <1 <5 <1 NR <1 NR NR NR NR NR NR NR 10/3/2018 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/9/2019 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/4/2021 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/4/2021 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/28/2022 0.393 J <1.0 <1.0 0.201 J 0.594 J 0.185 J <5.0 0.419 J <0.02 1.08 NR NR NR NR NR NR NR 11/14/2022 <0.50 <0.50 <0.50 <1.0 NE 0.65 <2.0 <0.50 <0.50 2.2 <0.50 <0.50 <0.50 <0.50 <0.50 0.54 <0.50 9/19/2023 < 0.50 < 0.50 < 0.50 < 1.5 NE < 0.50 < 2.0 < 0.50 < 0.50 3.5 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 MW-03 MW-04 Page 2 of 4 5,000 260,000 80,000 50,000 NE 20,000 6,000 400 50 70,000 5,900 70,000 30,500 26,100 70,000 28,500 24,100 MT B E N a p h t h a l e n e Be n z e n e To l u e n e Eth y l b e n z e n e To t a l X y l e n e s To t a l B T E X n- P r o p y l b e n z e n e St y r e n e 1,2 , 4 - Tr i m e t h y l b e n z e n e 1,3 , 5 - Tr i m e t h y l b e n z e n e GCL (μg/l) 1,2 - D i c h l o r o e t h a n e (D C A ) 1,2 - D i b r o m o e t h a n e (E D B ) Is o p r o p y l e t h e r ( I P E ) n-B u t y l b e n z e n e Ch l o r o f o r m Is o p r o p y l b e n z e n e (c u m e n e ) Well ID Date Sampled Chemicals of Concern (μg/l) 1/8/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 6/6/2014 2.3 <2.5 <2.4 <5.0 2.3 353 <5.0 5.1 <1.2 160 NR NR NR NR NR NR NR 4/3/2015 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/13/2015 <1.0 <5.0 <1.0 <2.0 NE 422 <5.0 <1.0 <1.0 184 NR NR NR NR NR NR NR 3/9/2016 5.96 <5.0 6.82 3.41 16.19 302 <5.0 3.96 <1.0 128 NR NR NR NR NR NR NR 5/24/2016 6.16 <2.5 <5.0 <10 6.16 297 <2.5 <5.0 <5.0 149 NR NR NR NR NR NR NR 9/1/2016 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/15/2017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/9/2017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/4/2018 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/3/2018 0.947 J <0.412 <0.384 <1.06 0.947 J 169 <1.0 2.25 NR 123 NR NR NR NR NR NR NR 9/9/2019 4.08 <0.412 1.67 <1.06 5.75 224 <1.0 <0.361 NR 125 NR NR NR NR NR NR NR 3/4/2021 3.66 1.79 1.41 4.35 11.21 170 2.20 J 2.09 NR 90.4 NR NR NR NR NR NR NR 11/4/2021 2.25 <1 0.847 J <3 3.097 173 <5 <1 NR 141 NR NR NR NR NR NR NR 4/28/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/14/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/19/2023 0.59 < 0.50 < 0.50 < 1.5 0.59 150 < 2.0 1.4 < 0.50 114 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 1/8/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 6/6/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/3/2015 51 <1.0 <1.0 <2.0 51 38 <5.0 5.3 <1.0 9.2 NS NS NS NS NS NS NS 10/13/2015 <1.0 <5.0 <1.0 <5.0 NE <1.0 16 <1.0 <2.0 2.64 NR NR NR NR NR NR NR 3/9/2016 <1.0 <5.0 <1.0 <3.0 NE 19 <5.0 2.45 <1.0 5.11 NR NR NR NR NR NR NR 5/24/2016 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/1/2016 1.35 <5.0 <1.0 <3.0 1.35 174 1.47 J 5.38 NR 17.9 NS NS NS NS NS NS NS 3/15/2017 1.31 <1 <1 <3 1.31 463 <5 10.2 NR 32.0 NS NS NS NS NS NS NS 10/9/2017 <1 <1 <1 <3 NE 1,430 <5 19.9 NR 83.1 NS NS NS NS NS NS NS 4/4/2018 <1 <1 <1 <3 NE 4,500 <5 <50 NR 166 NS NS NS NS NS NS NS 10/3/2018 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/9/2019 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/4/2021 1.71 1.04 0.678 J 2.63 J 6.058 3,810 <1.00 18.3 NR 126 NR NR NR NR NR NR NR 11/4/2021 <50 <50 <50 <50 NE 3,830 <250 19 NR 145 NR NR NR NR NR NR NR 4/28/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/14/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/19/2023 < 6.2 < 6.2 < 6.2 < 18.7 NE 1,620 < 25.0 6.3 < 6.2 61.6 < 6.2 < 6.2 < 6.2 < 6.2 < 6.2 11.5 < 6.2 MW-06 MW-05 Page 3 of 4 5,000 260,000 80,000 50,000 NE 20,000 6,000 400 50 70,000 5,900 70,000 30,500 26,100 70,000 28,500 24,100 MT B E N a p h t h a l e n e Be n z e n e To l u e n e Eth y l b e n z e n e To t a l X y l e n e s To t a l B T E X n- P r o p y l b e n z e n e St y r e n e 1,2 , 4 - Tr i m e t h y l b e n z e n e 1,3 , 5 - Tr i m e t h y l b e n z e n e GCL (μg/l) 1,2 - D i c h l o r o e t h a n e (D C A ) 1,2 - D i b r o m o e t h a n e (E D B ) Is o p r o p y l e t h e r ( I P E ) n-B u t y l b e n z e n e Ch l o r o f o r m Is o p r o p y l b e n z e n e (c u m e n e ) Well ID Date Sampled Chemicals of Concern (μg/l) 1/8/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 6/6/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/3/2015 <1.0 <1.0 <1.0 <2.0 NE <1.0 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 10/13/2015 <1.0 <5.0 <1.0 <2.0 NE <1.0 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 3/9/2016 <1.0 <5.0 <1.0 <3.0 NE <1.0 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 5/24/2016 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/1/2016 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/15/2017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/9/2017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/4/2018 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/3/2018 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/9/2019 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/4/2021 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/4/2021 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/28/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/14/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/19/2023 < 0.50 < 0.50 < 0.50 < 1.5 NE 3.0 < 2.0 < 0.50 < 0.50 0.58 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 1/8/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 6/6/2014 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/3/2015 <1.0 <1.0 <1.0 <2.0 NE 1.4 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 10/13/2015 <1.0 <5.0 <1.0 <2.0 NE 1.29 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 3/9/2016 <1.0 <5.0 <1.0 <3.0 NE 1.23 <5.0 <1.0 <1.0 <1.0 NR NR NR NR NR NR NR 5/24/2016 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/1/2016 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/15/2017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/9/2017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/4/2018 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/3/2018 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/9/2019 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 3/4/2021 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/4/2021 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/28/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/14/2022 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 9/19/2023 < 0.50 < 0.50 < 0.50 < 1.5 NE < 0.50 < 2.0 < 0.50 < 0.50 < 0.50 < 0.50 0.87 < 0.50 < 0.50 < 0.50 < 0.50 < 0.50 Notes: 2L - Maximum allowable concentrations as specified in T15A NCAC 2L.0202 < - Less than the Method Detection Limit GCL - Gross contamination level Recent Data - Highlighted in Blue Bold - Reported concentration exceeds 2L Italics/Bold - Reported concentrations exceeds GCL J - Estimated value NE - Not established NR - Not Reported NS - Not Sampled MW-07 MW-08 Historical Groundwater Analytical Data dated prior to the November 14, 2022 sampling event comes from Monitored Natural Attenuation Report No. 12, ATC Associates of North Carolina, Dated June 1, 2022. Concentrations reported in micrograms per liter (µg/l). Page 4 of 4 Appendix A IveySol#103 Brochure/Case Studies +1 604-538-1168 info@iveyinternational.com +1 604-538-1168