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Home My WebLink AboutWS-3706_12017_CA_MRP_20151214An Equal Opportunity Employer December 14, 2015 Mr. Gene Mao, L.G. Guilford County Dept. of Health and Human Services Division of Environmental Health Health, Environment, and Risk Assessment Unit 400 W. Market Street, Suite 300 Greensboro, NC 27401 Reference: MONITORING REPORT SPEEDWAY #6952 (FORMER WILCO #151) 2201 N. MAIN STREET HIGH POINT, GUILFORD COUNTY, NORTH CAROLINA INCIDENT NO. 12017 SITE RANKING: INTERMEDIATE RISK Dear Mr. Mao: Enclosed is a copy of a Monitoring Report for soil and groundwater for the above-referenced site. This site appears to be eligible for risk downgrade to “low” and subsequent closure through the filing of a Notice of Residual Petroleum. Should you have any questions or require additional information, please contact me at (937) 863-7642 or Trey Marchant at Mid- Atlantic Associates at (919) 250-9918. Sincerely, SPEEDWAY, LLC Keith A. Hughes Adv Environmental Representative Speedway LLC Speedway Office P.O. Box 1500 Springfield, OH 45501 Telephone 937-864-3000 MONITORING REPORT SPEEDWAY #6952 (FORMER WILCO #151) 2201 NORTH MAIN STREET HIGH POINT, NORTH CAROLINA INCIDENT NO.: 12017 FACILITY I.D. NO.: 00-0-0000017900 MID-ATLANTIC JOB NO. 000R1200.11 Source of Release: 12,000-gallon fuel oil UST and 12,000-gallon kerosene UST Date Release Discovered: March 17, 1994 Latitude: 35.983931° Longitude: 80.024105° Prepared For: Speedway LLC 500 Speedway Drive Enon, Ohio 45323 (937) 863-7642 Prepared By: Mid-Atlantic Associates, Inc. 409 Rogers View Court Raleigh, North Carolina 27610 (919) 250-9918 December 14, 2015 TABLE OF CONTENTS 1.0. INTRODUCTION ................................................................................................. 1 2.0 ASSESSMENT INFORMATION ............................................................................ 1 2.1 Soil Sample Collection .............................................................................. 1 2.2 Liquid Level Measurements ...................................................................... 2 2.3 Groundwater Sample Collection ............................................................... 2 3.0 DISCUSSION OF SAMPLING RESULTS .......................................................... 2 3.1 Summary of Soil Sampling Results .......................................................... 2 3.2 Summary of Groundwater Sampling Results ............................................ 2 4.0 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS ................................ 3 DRAWINGS Drawing 1.1 Topographic Site Map Drawing 1.2 Site Map TABLES Table 2.1 Summary of Depth-to-Water Measurements Table 3.1 Summary of Chemical Constituents Detected in Soil Table 3.2 Summary of Chemical Constituents Detected in Groundwater APPENDICES Appendix A Soil Boring Log Appendix B Laboratory Analytical Report and Chain of Custody Record Appendix C Mid-Atlantic Field Procedures 1.0. INTRODUCTION The subject site is the Speedway Store #6952 (former Wilco #151) located at 2201 North Main Street in High Point, North Carolina (Drawings 1.1 and 1.2). Please note that on October 1, 2014, Speedway, LLC acquired this site from Hess Corporation, who had previously acquired it from WilcoHess, LLC. According to Legacy Environmental Services, Inc. (Legacy), one 12,000 gallon fuel oil UST and one 12,000 kerosene UST were removed from the site on March 17, 1994. Following removal and site assessment activities, soil and groundwater contamination were found to exist at this facility. On April 21, 1994, 0.03 feet of free product was discovered in monitoring well MW-1. Legacy performed a comprehensive site assessment (CSA) and submitted a report dated October 28, 1994. In addition, Legacy conducted pre-CAP monitoring activities at the site in order to determine the effect of natural attenuation processes on the contaminant plume over time. A pre-CAP monitoring report was submitted and dated March 13, 1996. The free product recovery activities conducted at this site have included hand bailing of free product prior to 1998 and the recovery and disposal of free product through Aggressive Fluid Vapor Recovery (AFVR). Four previous AFVR events have been performed by Legacy at the former Wilco #151 from 1998 to 2000; the latest was performed on December 12, 2000. On December 141, 2001, a Mid-Atlantic representative gauged monitoring well MW-1 for free product and measured approximately 2.9 feet of free product within the well. As a result, Mid- Atlantic was granted pre-approval by Mr. Mao to perform two AFVR events; one in April 2002, and one in October 2002. Mid-Atlantic submitted a report, Free Product Recovery Report, dated May 17, 2002, for the first event. The report for the second event, also performed by Mid-Atlantic was submitted on October 10, 2002. The assessment work included in this report was performed in response to a request from Gene Mao of the Guilford County Division of Environmental Health (who administers the UST rules in Guilford County on behalf of the North Carolina Department of Environmental Quality, or NCDEQ), Incident Manager for this site. Mr. Mao requested gauging of free product, sampling of the wells, and soil sample collection in the area of previously-identified impacted soil. The purpose of this work is to determine if the site meets the requirements for regulatory closure under risk-based rules. 2.0 ASSESSMENT INFORMATION 2.1 Soil Sample Collection On October 16, 2015, Mid-Atlantic advanced one soil boring (HA-1) in the vicinity of RW-1, located approximately four feet from the western wall of the Speedway #6952 building. In 1994 a soil sample collected at approximately 9 feet below land surface (BLS) from the boring for RW-1 exhibited a Total Petroleum Hydrocarbon (TPH) reading of 54,300 milligrams per kilogram (mg/Kg). Soil boring HA-1 was advanced with a hand-auger to approximately 10 feet Site Check Report December 14, 2015 Speedway #6952 (Former Wilco #151) Page 2 High Point, North Carolina BLS. A soil boring log is attached in Appendix A. A sample was collected from 10 BLS and sent to ESC Lab Sciences in Mt. Juliet, Tennessee for analysis by the methods shown in the chain-of-custody provided in Appendix B. 2.2 Liquid Level Measurements Mid-Atlantic personnel collected liquid level measurements from selected site monitoring wells on October 16, 2015, using an oil/water interface probe. Depth-to-groundwater and/or depth-to-free product measurements were collected from existing monitoring wells MW-1, MW-4, and RW-1. The results are shown on Table 2.1. Liquid level measurements were collected using the procedures outlined in Appendix C. 2.3 Groundwater Sample Collection Mid-Atlantic personnel collected groundwater samples from existing monitoring wells MW-1 and MW-4 on October 16, 2015. Groundwater samples were collected using the procedures described in Appendix C. Samples were sent to ESC Lab Sciences in Mt. Juliet, Tennessee for analysis by the methods shown in the chain-of-custody provided in Appendix B. 3.0 DISCUSSION OF SAMPLING RESULTS 3.1 Summary of Soil Sampling Results The laboratory analytical report and chain-of-custody record for the soil sample collected on October 16, 2015 are provided in Appendix B and the results of selected contaminants of concern (COCs) are summarized in Table 3.1. Benzene was detected at a concentration of 0.0218 milligrams per kilogram (mg/Kg) which exceeds the Soil-to-Water Maximum Soil Contaminant Concentration (MSCC) of 0.0056 mg/Kg. Several other compounds were detected above the laboratory detection limit but below the Soil-to-Water MSCC. No target compounds exceeded the Residential MSCCs. 3.2 Summary of Groundwater Sampling Results Free Product Free product was not encountered in MW-1, RW-1, or MW-4 during the October 16, 2015 assessment activities. Previous gauging of MW-1 on February 16, 2011 did not reveal the presence of free product either. Dissolved Phase The laboratory analytical report and chain-of-custody record for groundwater samples collected on October 16, 2015 are provided in Appendix B and the results of selected COCs are summarized in Table 3.2. As summarized, the groundwater sample collected from well MW-1 Site Check Report December 14, 2015 Speedway #6952 (Former Wilco #151) Page 3 High Point, North Carolina exhibited a concentration of bis (2-ethylhexyl) phthalate which exceeded the NCGQS. Benzene, di-isopropyl ether, methyl tert-butyl ether, and C5-C8 aliphatics were detected in the groundwater sample collected from MW-4 at concentrations exceeding the NCGQS but below gross contamination levels (GCL). Ethylbenzene and C9-C18 aliphatics were detected in the groundwater sample from MW-4 at concentrations which did not exceed the NCGQS. 4.0 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS The activities conducted during the assessment activities are summarized as follows: • Two wells, MW-1 and RW-1 were gauged for free product; • Groundwater samples were collected from MW-1 and MW-4; and • A soil sample was collected from one hand auger boring which was advanced in the vicinity of RW-1. Based on the results of data collected during this assessment, Mid-Atlantic concludes the following: • The soil sample collected from HA-1, which is located in an area that historically contained high concentrations of TPH, exhibited a concentration of one COC (benzene) which exceeds the Soil-to-Water MSCC but is less than the Residential MSCC. Therefore, it appears that soil does not exceed the health-based (unrestricted use) standards for this site; • The groundwater sample collected from monitoring well MW-4 exhibited concentrations of several COCs above the NCGQS; however, only one COC exceeding its NCGQS was detected in the sample collected from MW-1. Neither of the samples exhibited target compound concentrations that exceed the GCLs. Therefore, it appears that groundwater at this site exceeds the health-based (NCGQS) standards, but does not exceed the RBCA cleanup standards; and • Since soil and groundwater do not exceed the RBCA cleanup standards, it appears that this site meets the criteria for a “low risk” classification. The incident should be eligible for closure through the filing of a Notice of Residual Petroleum (NRP) with the property deed. The NRP will place a restriction on the use of groundwater beneath the site. Based on these conclusions, Mid-Atlantic recommends the following: • Site closure through the filing of a NRP with the property deed; and • Submittal of this report to the Guilford County Division of Environmental Health (who will review on behalf of NCDEQ) for review and comment. DRAWINGS TABLES WELL ID DEPTH TO WATER, 10/16/2015 (FEET BELOW TOC) MW-1 16.58 MW-4 22.18 RW-1 24.12 Notes: TOC - Top of Casing TABLE 2.1 2201 NORTH MAIN STREET HIGH POINT, NORTH CAROLINA MID-ATLANTIC JOB NO. 000R1200.11 SUMMARY OF DEPTH-TO-WATER MEASUREMENTS SPEEDWAY #6952 HA-1 10' 10/16/2015 1,2,4-Trimethylbenzene 8260B 0.004 8.5 782 20,440 2-Butanone (MEK) 8260B 0.0214 16 9,385 245,280 Benzene 8260B 0.0218 0.0056 18 164 Ethylbenzene 8260B 0.00184 4.9 1,560 40,000 Methyl tert-butyl ether (MTBE) 8260B 0.00619 0.091 350 3,100 Naphthalene 8260B 0.00864 0.16 313 8,176 n-Propylbenzene 8260B 0.00128 1.7 626 16,350 sec-Butylbenzene 8260B 0.00152 3.3 626 16,350 Fluoranthene 8270D 0.0422 290 620 16,400 Naphthalene 8270D 0.0424 0.16 313 8,176 Phenanthrene 8270D 0.0853 56 469 12,264 C9-C18 Aliphatics MADEP VPH/EPH 13.2 540 1,500 40,000 C9-C22 Aromatics MADEP VPH/EPH 8.58 31 469 12,614 mg/Kg - Milligrams per Kilogram MSCC - Maximum Soil Contaminant Concentration Level Bold - Concentration exceeds Soil-to-Water MSCC Industrial / Commercial Soil MSCC TABLE 3.1 SUMMARY OF CHEMICAL CONSTITUENTS DETECTED IN SOIL SPEEDWAY #6952 HIGH POINT, NORTH CAROLINA MID-ATLANTIC JOB NO. R1200.11 CHEMICAL CONSTITUENT ANALYSIS METHOD CONCENTRATION (mg/kg) Soil-to-Water MSCC Residential Soil MSCC 2201 NORTH MAIN STREET MW-1 MW-4 10/16/2015 10/16/2015 Benzene BDL 12 1 5000 Di-isoprpyl ether BDL 136 70 25000 Ethylbenzene BDL 4.19 600 84500 Methyl tert-butyl ether BDL 646 20 20000 Bis (2-ethylhexyl) phthalate 5.52 BDL 3 170 C5-C8 Aliphatics BDL 2270 400 NL C9-C18 Aliphatics BDL 212 700 NL Notes: BDL - Below laboratory detection limit Volatile Organic Compounds -EPA Method 602MS Semi-Volatile Organic Compounds - EPA Method 625 MADEP EPH and VPH Bold values denote that analyte was detected above its 2L North Carolina Groundwater Quality Standard TABLE 3.2 SUMMARY OF CHEMICAL CONSTITUENTS DETECTED IN GROUNDWATER SPEEDWAY #6952 HIGH POINT, NORTH CAROLINA MID-ATLANTIC JOB NO. R1200.11 CHEMICAL CONSTITUENT CONCENTRATION (µg/L) NC Groundwater Quality Standards Gross Contamination Levels for Groundwater 2201 NORTH MAIN STREET APPENDIX A Soil Boring Log APPENDIX B Laboratory Analytical Report and Chain of Custody Record APPENDIX C Mid-Atlantic Field Procedures