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HomeMy WebLinkAboutWS-10149_45292_CA_LSA_20200615PHASE I LIMITED SITE ASSESSMENT REPORT Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Incident No. 45292 Prepared For: Mr. Bobby Page Page Distributing Company, Inc. P.O. Box 25045 Winston-Salem, North Carolina 27114 Prepared By: Progress Environmental Group, Inc. P.O. Box 5884 Winston-Salem, North Carolina 27113 (336) 722-9999 Progress Project No. 1020075.001 June 11, 2020 Phase I Limited Site Assessment Page Distributing Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 i TABLE OF CONTENTS A SITE IDENTIFICATION ....................................................................................................................... 1 B RISK CHARACTERIZATION .............................................................................................................. 2 1 GROUNDWATER/SURFACE WATER/VAPOR IMPACTS .............................................................................. 2 2 LAND USE ............................................................................................................................................... 3 C RECEPTOR INFORMATION ............................................................................................................... 4 1 WATER-SUPPLY WELLS .......................................................................................................................... 4 2 PUBLIC WATER SUPPLIES ....................................................................................................................... 4 3 SURFACE WATER .................................................................................................................................... 4 4 WELLHEAD PROTECTION AREAS ............................................................................................................ 5 5 DEEP AQUIFERS IN THE COASTAL PLAIN PHYSIOGRAPHIC REGION ........................................................ 5 6 SUBSURFACE STRUCTURES ..................................................................................................................... 5 7 PROPERTY OWNERS AND OCCUPANTS .................................................................................................... 5 D SITE GEOLOGY AND HYDROGEOLOGY ....................................................................................... 5 E SAMPLING RESULTS ........................................................................................................................... 6 1 SOIL ........................................................................................................................................................ 6 2 GROUNDWATER ...................................................................................................................................... 6 F CONCLUSIONS AND RECOMMENDATIONS ................................................................................. 6 G FREE PRODUCT INVESTIGATION/RECOVERY ........................................................................... 7 H SITE HISTORY ....................................................................................................................................... 7 I REFERENCES ....................................................................................................................................... 10 FIGURES Figure 1 – Topographic Site Map Figure 2 – Site Map Figure 3 – Surrounding Property Owners Map Figure 4 – Receptor and Areas of Public Assembly Map Figure 5 – Zoning Map TABLES Table B-4 – Summary of Detected Groundwater Analytical Results Table B-6 – Surrounding Property Owners Table B-7 – Well Construction Information APPENDICES Appendix A – Boring Logs and Well Construction Records Appendix B – Standard Sampling Procedures Appendix C – Returned Water-Supply Questionnaires Appendix D – Laboratory Test Reports and Chains-of-Custody Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 2 B RISK CHARACTERIZATION 1 Groundwater/Surface Water/Vapor Impacts High Risk 1. Has the release contaminated any water-supply well including any well used for non- drinking purposes? NO 2.Is a water-supply well used for drinking water located within 1,500 feet of the source area of the discharge or release? NO 3. Is a water-supply well not used for drinking water (e.g. irrigation, washing cars, industrial cooling water, filling swimming pools) located within 250 feet of the source area of the release? NO 4. Does groundwater within 500 feet of the source area of the release have the potential for future use (there is no other source of water supply other than groundwater)? NO Public water is available in the vicinity of the site. 5.Do vapors from the release pose a threat of explosion because of accumulation of the vapors in a confined space or pose any other serious threat to public health, public safety, or the environment? NO 6.Are there any other factors that would cause the release to pose an imminent danger to public health, public safety, or the environment? NO Intermediate Risk 7.Is a surface water body located within 500 feet of the source area of the release? NO If yes, does the maximum groundwater contaminant concentration exceed the surface water quality standards and criteria found in 15A NCAC 2B .0200 by a factor of 10? 8. Is the source area or release located within an approved or planned wellhead protection area as defined in 42 USC 300h-7(e)? NO 9.Is the release located in the Coastal Plain physiographic region as designated on a map entitled “Geology of North Carolina” published by the Department in 1985? NO 10.Do the levels of groundwater contamination for any contaminants exceed the gross contaminant levels (GCL) (see Table 9 of the New Guidelines) established by the Department? NO Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 3 2 Land Use Property Containing Source Area of Release The questions below pertain to the property containing the source area of the release. 1. Does the property contain one or more primary or secondary residences (permanent or temporary)? NO Describe. The property was formerly developed with a bulk oil facility which stored petroleum products in USTs for distribution and retail sale. The site buildings were demolished in December 2019. 2. Does the property contain a school, daycare center, hospital, playground, park, recreation area, church, nursing home, or other place of public assembly? NO Describe. The property was formerly developed with a bulk oil facility which stored petroleum products in USTs for distribution and retail sale. The site buildings were demolished in December 2019. 3. Does the property contain a commercial (e.g., retail, warehouse, office/business space, etc.) or industrial (e.g., manufacturing, utilities, industrial research and development, chemical/petroleum bulk storage, etc.) enterprise, an inactive commercial or industrial enterprise, or is the land undeveloped? NO Describe. The property was formerly developed with a bulk oil facility which stored petroleum products in USTs for distribution and retail sale. The site buildings were demolished in December 2019. 3.Do children visit the property? NO Explain. The property is does not currently include site buildings. 4.Is access to the property reliably restricted consistent with its use (e.g., fences, security personnel or both)? NO Explain. Access restrictions are not deemed necessary. 5.Do pavement, buildings, or other structures cap the contaminated soil? NO If yes, explain what mechanisms are in place or can be put into place to ensure that the contaminated soil will remain capped in the foreseeable future. The contaminated soil is beneath an area that was disturbed by the removal of the USTs. 6. What is the zoning status of the property? The subject site is zoned Highway Business (HB) (Figure 5). 7. Is the use of the property likely to change in the next 20 years? UNKNOWN Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 4 Explain. The property is currently vacant but located in a highly desirable area of Winston- Salem, North Carolina. Progress does not have knowledge of future development plans associated with the site. Property Surrounding Source Area of Release The questions below pertain to the area within 1,500 feet of the source area of the release (excludes property containing source area of the release). 1. What is the distance from the source area of the release to the nearest primary or secondary residence (permanent or temporary)? The nearest off-site residence (apartments) is located approximately 420 feet to the southwest of the source area. 2. What is the distance from the source area of the release to the nearest school, daycare center, hospital, playground, park, recreation area, church, nursing home or other place of public assembly? Progress identified one area of public assembly within 1,000 feet of the source area. The location of the public assembly is depicted on Figure 4. 3. What is the zoning status of properties in the surrounding area? The surrounding properties in the area are predominately zoned as General Business and Residential Multi-family. 4.Briefly characterize the use and activities of the land in the surrounding area. Land uses in the surrounding area are primarily commercial and also include apartments. C RECEPTOR INFORMATION 1 Water-Supply Wells Progress mailed 17 water-supply well questionnaires to the property owners within a 500- foot radius of the site. Eight of the questionnaires have been completed and returned at the time of this report. Progress also completed a visual reconnaissance within 1,500 feet of the site. The water-supply well questionnaire process did not reveal any water-supply wells within 1,500 feet of the source area. Progress did not identify evidence of water-supply wells during the vehicular reconnaissance of accessible properties within 1,500 feet of the site. Municipal water is available from the City of Winston-Salem in the vicinity of the site. Copies of the returned water-supply well questionnaires are included in Appendix C. 2 Public Water Supplies Are public water supplies available within 1,500 feet of the source are of the release? YES If yes, where is the location of the nearest public water line and the source(s) of the public water supply? The site is serviced by municipal water from the City of Winston-Salem. 3 Surface Water Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 5 According to the USGS topographic map, Little Creek is located approximately 1,400 feet to the northwest. 4 Wellhead Protection Areas The source area is not located within an established wellhead protection area. 5 Deep Aquifers in the Coastal Plain Physiographic Region The subject site is not located in the Coastal Plain Physiographic Province. 6 Subsurface Structures Overhead electrical and phone utility lines are located at the subject site. Subsurface water and sewer lines are at the site and along the Stratford Court right-of-way. Subsurface utilities were not identified in the location of the former UST systems. 7 Property Owners and Occupants Carol Page Armstrong Revocable Trust currently owns the subject property. Adjacent parcels are developed with commercial use properties. The names and addresses of the adjacent property owners are provided in Table B-6 and referenced on Figure 3. D SITE GEOLOGY AND HYDROGEOLOGY According to the Geologic Map of North Carolina (1985), the subject property is situated in the Milton Belt of the Piedmont Physiographic Province of North Carolina. The site is located in an area underlain by biotite gneiss and schist. In the Piedmont Physiographic Province, groundwater generally occurs under water-table conditions and is stored in the pore space between individual grains of residual soil and in the fractures within the underlying parent rock. Due to the intense shearing associated with the thrust faulting in the area, it can be expected that the fractures play a major role in the flow of groundwater in the subsurface. Recharge to the water table is primarily by precipitation infiltrating the upper soils and percolating downward, under the influence of gravity, to the groundwater table. Typically, the water table is not a level surface, but a subdued reflection of the land surface. However, the depth to the water table is not constant, and depends on many factors, which include the amount of rainfall, the permeability of the soil, and the amount of groundwater being pumped in the area. Based on our review of the topographic map and on-site observation, the site slopes gently to the south-southeast. Groundwater generally flows in directions sub-parallel to the ground surface slopes and under the influence of gravity toward points of discharge such as creeks, swamps, drainage swales, or pumped groundwater wells. Based on topographic inference, groundwater beneath the site most likely flows to the south-southeast toward a railroad right- of-way. Little Creek is located approximately 1,400 feet to the northwest of the source area (Figure 1). Note that the area is highly developed and influenced by various stormwater management structures. Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 6 E SAMPLING RESULTS 1 Soil Groundwater was encountered during the over-excavation activities and, therefore, soil samples were not collected during the assessment. Note that groundwater levels within the site monitoring wells ranged from approximately 22 – 23 feet bls. 2 Groundwater Two Type II permanent monitoring wells were installed during the LSA activities using a truck-mounted drill rig and hollow-stem augers on May 18, 2020 by 3D Environmental Investigations, LLC (3D). 3D installed two, two-inch monitoring wells (MW-1 and MW-2) to approximate depths of 35 and 30 feet bls, respectively, with 15 feet of 0.01 slotted Schedule 40 PVC screen using the hollow stem auger drilling method. Progress developed and sampled the monitoring wells on May 18, 2020 following installation. The groundwater samples were collected using a disposable bailer and new length of cord and transferred to laboratory containers. The groundwater samples collected from monitoring wells MW-1 and MW-2 were analyzed for volatile organic compounds (VOCs) using EPA Method 602, for sei-volatile organic compounds (SVOCs using EPA Method 625, and for volatile and extractable petroleum hydrocarbons (VPH and EPH) using the Massachusetts Department of Environmental Quality (MADEP) Method. Laboratory analysis of the groundwater sample collected from monitoring well MW-1 detected naphthalene (78.2 µg/L), 2-methylnaphthalene (359 µg/L), 1-methylnaphthalene (312 µg/L), C9-C18 Aliphatics (50,280 µg/L), and C9-C22 Aromatics (18,130 µg/L) at concentrations exceeding their respective North Carolina 2L Groundwater Quality Standards (NC2LGWQS). None of the concentrations of targeted compounds detected exceed the applicable applicable Gross Contamination Level (GCL). Laboratory analysis of the groundwater sample collected from monitoring well MW-2 detected naphthalene (82.0 µg/L), 1-methylnaphthalene (99.8 µg/L), 2-methylnaphthalene (139 µg/L), C9-C18 Aliphatics (2,470 µg/L), and C9-C22 Aromatics (1,647 µg/L) at concentrations exceeding their respective NC2LGWQS. None of the concentrations of targeted compounds detected exceed the applicable GCL. A summary of the groundwater analytical results is included in Table B-4. Copies of the laboratory data sheets and chain-of-custody record are included in the Appendix D. The groundwater sample was collected using the methods described in Appendix B. F CONCLUSIONS AND RECOMMENDATIONS Based on the results of the receptor survey and groundwater sampling activities, Progress makes the following conclusions and recommendations: 1.The site meets the criteria for an Low Risk site based on the absence of detected concentrations of targeted petroleum compounds exceeding the applicable Gross Contamination Level, a surface water feature not being identified within 500 feet, and water- Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 7 supply wells not being identified within 1,000 feet of the source area. The site is not located within a wellhead protection area. 2.Laboratory analysis of the groundwater sample collected from monitoring well MW-1 and MW-2 detected targeted petroleum hydrocarbons at concentrations exceeding their respective NC2LGWQS. Please note that concentrations of detected targeted compounds did not exceed the applicable GCLs. 3.Progress recommends that a copy of this report be submitted to the Winston-Salem Regional Office of the North Carolina Department of Environmental Quality (NCDEQ), Division of Waste Management, UST Section. G FREE PRODUCT INVESTIGATION/RECOVERY Free product was not detected in the monitoring wells during the May 2020 sampling event. H SITE HISTORY Progress Environmental Group, Inc. (Progress) was contracted by Page Distributing Company, Inc. to conduct underground storage tank (UST) closure activities at the Page Distributing Company Site located at 150 Stratford Court in Winston-Salem, Forsyth County, North Carolina (Figure 1). The site consists of a former bulk oil facility which stored petroleum products in USTs for distribution and retail sale. At the time of the removal the site was not an operating facility. The site is located in a generally commercial area of Winston-Salem.It is likely that the surrounding properties are served by the Winston-Salem municipal water-supply system. The closure activities included the removal of three gasoline USTs, two new oil USTs, one diesel fuel UST, one waste oil UST, associated piping, and fuel dispensers. The site is depicted on Figure 2. On September 30, 2019 through October 4, 2019 Stewarts Grading and Hauling excavated the overburden soil from the vicinity of the USTs using a trackhoe. Progress personnel provided oversight during excavation activities. The USTs were encountered approximately three to four feet below land surface (bls). Stewarts Grading and Hauling evacuated the fluids (approximately 1,525 gallons) via a vacuum truck and tanker prior to the UST removals. Progress did not note significant damage or perforations on the USTs. The USTs were transported off-site via flatbed trailer to a metal recycling facility. The excavation for the gasoline USTs was approximately 36 feet by 27 feet by 13 feet deep. Petroleum odors were noted in the vicinity of the fillports at the time of removal. The excavation for the new oil USTs was approximately 22 feet by 25 feet by 13 feet deep. The excavation for the diesel fuel UST was approximately 25 feet by 12 feet by 13 feet deep. Noticeable petroleum odors were noted during the excavation of the diesel fuel UST. The excavation of the waste oil UST was approximately 21 feet by 9 feet by 9 feet deep. A total of nine soil samples were obtained beneath the gasoline USTs from the bucket of the trackhoe for analysis for gasoline range total petroleum hydrocarbons (TPH-G) (T-1-1, T-1-2, T-1-3, T-2-1, T- 2-2, T-2-3, T-3-1, T-3-2, and T-3-3). Progress collected a total of six soil samples beneath the two 8,000-gallon new oil USTs (T-4-1, T-4-2, T-4-3, T-5-1, T-5-2, and T-5-3) from the bucket of the trackhoe for analysis for diesel range total petroleum hydrocarbons (TPH-D). Progress collected a total of three soil samples beneath the 8,000-gallon diesel UST (T-6-1, T-6-2, T-6-3) from the bucket of the Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 8 trackhoe for analysis for total petroleum hydrocarbons as TPH-G and TPH-D. Progress collected a total of two soil samples beneath the 2,000-gallon waste oil UST (T-7-1 and T-7-2) from the bucket of the trackhoe for analysis for volatile organic compounds, semi-volatile organic compounds, volatile and extractable petroleum hydrocarbons, and lead and chromium. Progress collected a total of 13 soil samples beneath the fuel distribution lines (L-1 through L-13) from the bucket of the trackhoe for analysis for TPH-G, with samples collected from beneath distribution lines associated with the diesel fuel UST also analyzed for TPH-D. Progress collected a total of 4 soil samples beneath the dispensers (D-1 through D-4) from the bucket of the trackhoe for analysis for TPH-G, with samples collected from beneath the dispensers associated with the diesel fuel UST also analyzed for TPH-D. After obtaining each soil sample, the soil samples were transferred to laboratory-prepared containers and immediately placed on ice. A label with the facility name, soil sample number, date and time of sampling, and parameter to be analyzed was affixed to each container for identification. New disposable latex gloves were used to maintain sample integrity during the sampling process. Proper preservation methods and chain-of-custody procedures were followed throughout the sampling process. Progress supervised soil excavation activities on November 11 through 14, 2019 following removal of the UST system. Soil excavation activities were completed by Stewarts Grading and Hauling utilizing a trackhoe. Accessible contaminated soil was loaded into awaiting dump trucks and transported to the AES, Inc. facility in Thomasville, North Carolina. Approximately 624.24 tons of contaminated soil were excavated in an effort to remove the impacted soil. The over-excavation of contaminated soil proximal to the diesel fuel UST was an irregularly shaped polygon, with a larger area in the vicinity of the southern end of the UST and former dispenser location. The excavation of the former UST area had an approximate width of 16 feet on the northern end and 20 feet on the southern end, an approximate length of 31 feet, and a depth of approximately 20 feet bls. The over- excavation proximal to the release identified along the diesel fuel dispensing line was approximately 15 feet by four feet and extended less than a foot beneath the former product line. The over- excavation in the area of the former diesel fuel dispenser area had an approximate width of 15 feet by 15 feet and a depth of approximately 25 feet bls. Progress collected soil samples from the sidewalls of the excavations (SW-1 through SW-10) and from the base of the over-excavation proximal to the diesel fuel UST (B-1) to be analyzed for volatile organic compounds (VOCs) by EPA Method 8260/5035, for semi-volatile organic compounds using EPA Method 8270, and for volatile and extractable petroleum hydrocarbons (VPH and EPH) by the Massachusetts Department of Environmental Protection (MADEP) Methods. The sidewall soil samples were collected from an approximate depth of 14 feet bls. The soil sample collected from the base of the excavation in the areas of the identified soil contamination at the time of the UST Closure were collected from an approximate depth of 20 feet bls. Progress collected soil samples Truck 1 through Truck 39 from the excavated soil for disposal purposes. The disposal soil samples were analyzed for TPH-G and TPH-D using the UVF Method by Redlabs mobile laboratory. The soil samples were collected using the bucket of the trackhoe from soil being excavated for off-site disposal. The confirmation soil samples were appropriately packaged and delivered to Research and Analytical Laboratories, Inc. (R&A) in Kernersville, North Carolina. Proper chain-of-custody procedures were maintained throughout the sample collection and transportation process. Following the collection of soil samples, Stewarts Grading and Hauling backfilled the excavation with imported fill material from a nearby quarry. Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 9 Laboratory analysis of soil sample L-10 collected beneath the product line and soil sample T-6-1 collected beneath the diesel fuel UST detected TPH-G above the North Carolina Action Level of 50 mg/Kg. Laboratory analysis of soil samples T-6-1, T-6-2, and T-6-3 collected beneath the diesel fuel UST detected TPH-D above the North Carolina Action Level of 100 mg/Kg. Laboratory analysis of soil samples D-1 and D-2 collected beneath the diesel fuel dispensers detected TPH-D above the North Carolina Action Level of 100 mg/Kg. Laboratory analysis of the remaining soil samples collected from beneath the fuel distribution lines and dispensers did not exhibit concentrations above the applicable standards. Laboratory analysis of soil samples SW-1 and SW-6 collected from the sidewalls of the over- excavation did not detect targeted compounds above their respective Soil-to-Groundwater Maximum Soil Contaminant Concentrations (MSCCs) or Residential Soil Cleanup Levels. Laboratory analysis of soil samples SW-7, SW-8, and SW-10 from the sidewalls and B-1 from the base of the over- excavation of contaminated soil proximal to the former diesel fuel dispensing island detected at least one targeted compound above its respective Soil-to-Groundwater MSCC and/or Residential Soil Cleanup Level. Groundwater was encountered in the over-excavation in the vicinity of the former diesel fuel dispensers at a depth of approximately 24 feet bls in the open excavation. Therefore, a soil sample was not collected from the base of the excavation in the vicinity of the former diesel fuel dispensers. Free product was not observed during the UST removal activities. Following the completion of the initial abatement activities, Progress concluded the following: Progress supervised the removal of a total of seven USTs, associated fuel dispensing lines, and fuel dispensers from the subject site. Progress collected a total of nine soil samples beneath the three gasoline USTs (T-1-1, T-1-2, T-1- 3, T-2-1, T-2-2, T-2-3, T-3-1, T-3-2, and T-3-3). Progress collected a total of six soil samples beneath the two 8,000-gallon new oil USTs (T-4-1, T-4-2, T-4-3, T-5-1, T-5-2, and T-5-3). Progress collected a total of three soil samples beneath the 8,000-gallon diesel UST (T-6-1, T-6-2, T-6-3). Progress collected two soil samples beneath the 3,000-gallon waste oil UST (T-7-1 and T- 7-2). Laboratory analysis of the soil samples T-6-1 (18,500 mg/Kg), T-6-2 (14,700 mg/Kg), and T-6-3 (667 mg/Kg) collected beneath the diesel fuel UST indicated TPH-D concentrations in excess of the North Carolina Action Level. Additionally, laboratory analysis of soil sample T-6-1 (82.0 mg/Kg) collected beneath the diesel fuel UST indicated a TPH-G concentration in excess of the North Carolina Action Level. Progress collected a total of 13 soil samples beneath the fuel distribution lines (L-1 through L-13). Laboratory analysis of the soil samples collected from beneath the fuel distribution lines did not exhibit detectable concentrations of TPH-G and/or TPH-D, except for line sample L-10 (94.1 mg/Kg TPH-G and 221 mg/Kg TPH-D). Progress collected a total of 4 soil samples beneath the dispensers (D-1 through D-4). Laboratory analysis of the soil samples D-3 and D-4 collected from beneath the gasoline dispensers did not exhibit detectable concentrations of TPH-G. Laboratory analysis of the soil samples D-1 (22,300 mg/Kg) and D-2 (22,700 mg/Kg) collected beneath the diesel fuel dispensers indicated TPH-D concentrations in excess of the North Carolina Action Level. Based on the presence of notably contaminated soil, Progress supervised the over-excavation of contaminated soil beneath the diesel fuel UST, fuel distribution lines, and former diesel dispensers. Phase I Limited Site Assessment Page Distributing Company Site 150 Stratford Court Winston-Salem, Forsyth County, North Carolina Progress Project No. 1020075.001 June 11, 2020 10 Soil samples were screened using Redlabs mobile laboratory to complete the guided excavation. Approximately 624.24 tons of petroleum-impacted soil were excavated from the site and transported to an off-site permitted disposal facility. Following the over-excavation of the contaminated soil, Progress screened the soil samples from the sidewalls of the excavation via Redlabs mobile laboratory. Each of the soil samples selected for laboratory analysis did not exhibit TPH as gasoline at concentrations exceeding the North Carolina Action Level when analyzed using the UVF Method. Progress collected conformation soil samples from the sidewalls and base of the over-excavations. Prior to collecting the soil samples for confirmation sampling, Progress utilized the Redlabs mobile laboratory to screen the soil samples for TPH-G and TPH-D. Laboratory analysis of soil samples SW-1 and SW-6 collected from the sidewalls of the over-excavation did not detect targeted compounds above their respective Soil-to-Groundwater Maximum Soil Contaminant Concentrations (MSCCs) or Residential Soil Cleanup Levels. Laboratory analysis of soil samples SW-7, SW-8, and SW-10 from the sidewalls of the over-excavation of contaminated soil proximal to the former diesel fuel dispensing island detected at least one targeted compound above its respective Soil-to-Groundwater MSCC and/or Residential Soil Cleanup Level. Groundwater was encountered in the over-excavation in the vicinity of the former diesel fuel dispensers at a depth of approximately 24 feet bls in the open excavation. Therefore, a soil sample was not collected from the base of the excavation in the vicinity of the former diesel fuel dispensers. Progress recommended submitting a copy of this report to the Winston-Salem Regional Office of the NCDEQ. I REFERENCES North Carolina Department of Natural Resources and Community Development Geologic Map of North Carolina published 1985. Underground Storage Tank Section, North Carolina Department of Environment and Natural Resources, Guidelines for Assessment and Corrective Action for UST Releases, Effective December 1, 2013. UST Closure and Initial Abatement Action Report, prepared by Progress Environmental Group, Inc. and dated December 12, 2019. FIGURES Figure 1 Topographic Site Map Page Distributing Company Site 150 Stratford Court Winston-Salem, North Carolina P.O. Box 5884 Winston-Salem, NC 27113 Telephone: (336) 722-9999 Fax: (336) 722-9998 www.progressenvironmental.com Winston-Salem West, N.C. United States Department of the Interior United States Geological Survey 7.5 Minute Series Topographic Map Contour Interval: 10 feet Scale: 1”=2000’ Date: 2016 Project: Page Distributing Client: Page Distributing Progress Job #: 1020075.001 Date: June 2020 SITE Site ProgressENVIRONMENTAL GROUP, INC.JSLJUNE 2020JABAS SHOWNJUNE 2020Figure 2.SKFP.O. Box 5884WINSTON-SALEM, NORTH CAROLINA 27113PHONE 336.722.9999 FAX 336.722.9998FIGURE 2SITE MAPPAGE DISTRIBUTING COMPANY SITE150 STRATFORD COURTWINSTON-SALEM, NORTH CAROLINAPROJECTGASGASGASDI ESELNEW OI LNEW OI LU S ED O I L 11020075.001MW-1MW-2 Figure 3 Surrounding Property Owners Map Page Distributing Company Site 150 Stratford Court Winston-Salem, North Carolina P.O. Box 5884 Winston-Salem, NC 27113 Telephone: (336) 722-9999 Fax: (336) 722-9998 www.progressenvironmental.com Winston-Salem, N.C. Aerial Date: 2018 Forsyth County Tax Parcel Viewer https://mapf.maps.arcgis.com/apps/we bappviewer/index.html?id=1a9685359 8c3460191ca465834b3456d Scale: As Shown Project: Page Distributing Client: Page Distributing Progress Job #: 1020075.001 Date: June 2020 Site 1 2 4 3 LEGEND AREA OF PUBLIC ASSEMBLY ProgressENVIRONMENTAL GROUP, INC.JSLJUNE 2020JABSHOWNJUNE 2020Figure 4.SKFP.O. Box 5884WINSTON-SALEM, NORTH CAROLINA 27113PHONE 336.722.9999 FAX 336.722.9998FIGURE 4RECEPTOR AND AREAS OF PUBLIC ASSEMBLY MAPPAGE DISTRIBUTING COMPANY SITE150 STRATFORD COURT WINSTON-SALEM, NORTH CAROLINA%db("MAG-DATE")PROJECT1,000' FEET 1020075.001 Figure 5 Zoning Map Page Distributing Company Site 150 Stratford Court Winston-Salem, North Carolina HB = Highway Business P.O. Box 5884 Winston-Salem, NC 27113 Telephone: (336) 722-9999 Fax: (336) 722-9998 www.progressenvironmental.com Winston-Salem, N.C. Forsyth County Planning & Development Viewer https://mapf.maps.arcgis.com/apps/webap pviewer/index.html?id=ff6a9860507f4979 83bcbea3dabde48c Scale: As Shown Project: Page Distributing Client: Page Distributing Progress Job #: 1020075.001 Date: June 2020 Site TABLES Well Number Sampling Date Depth to Water MW-1 05/18/20 23.28 BQL 28.5 6.50 89.0 78.2 93.0 312 359 BQL 50,280 18,130 7,930 MW-2 05/18/20 21.91 BQL 3.20 BQL 3.64 82.0 BQL 99.8 139 BQL 2,470 1,647 BQL 1 600 600 500 6 200 1 30 400 700 200 10,000 5,000 84,500 260,000 85,500 6,000 410 1,000 12,500 NS NS NS NS Notes: = Exceeds North Carolina 2L Groundwater Quality Standards (NC2LGWQS) = Exceeds Gross Contamination Levels (GCLs) Contaminant concentrations are reported in micrograms per liter (µg/L) NE = Not Established BQL = Below Quantitation Limts NS No Standard C19-C36 AliphaticsTolueneNaphthaleneC9-C18 AliphaticsC9-C22 AromaticsTotal Xylenes1-MethylnaphthaleneC5-C8 Aliphatics2-MethylnaphthalenePhenanthareneGCLs BenzeneContaminant of Concern NC2LGWQS EthylbenzeneAnalytical Method USEPA Method 625 TABLE B-4 SUMMARY OF DETECTED GROUNDWATER ANALYTICAL RESULTS PHASE I LIMITED SITE ASSESSMENT REPORT PAGE DISTRIBUTING COMPANY SITE 150 STRATFORD COURT WINSTON-SALEM, FORSYTH COUNTY, NORTH CAROLINA NCDEQ INCIDENT NO. 45292 USEPA 602 MADEP Method VPH/EPH Map ID Name Property Address Mailing Address 163 Stratford Court P.O. Box 38638 Winston-Salem, North Carolina 27103 Greensboro, NC 27438 120 Miller Street Medical Center Boulevard Winston-Salem, North Carolina 27103 Winston Salem, NC 27157 140 Stratford Court 112 Brandon Place Winston-Salem, North Carolina 27103 Winston Salem, NC 27104 165 Stratford Court 112 Brandon Place Winston-Salem, North Carolina 27103 Winston Salem, NC 27104 Map ID numbers are referenced to Figure 3 1 Green Valley Office Suites, LLC INCIDENT NO. 45292 TABLE B-6 SURROUNDING PROPERTY OWNERS PHASE I LIMITED SITE ASSESSMENT REPORT PAGE DISTRIBUTING COMPANY SITE 150 STRATFORD COURT WINSTON-SALEM, FORSYTH COUNTY, NORTH CAROLINA 2 WFU Health Sciences Frank and Lynda Morris3 4 Morris LP Company Well Screened Total Depth to Relative Groundwater Monitoring Well Installation Diameter Interval Depth to Water Elevation Elevation ID Date (inches)(feet)(feet)(feet TOC) (feet TOC )**(feet) 5/18/2020 MW-1 5/18/2020 2 20-35 35 23.28 NM NM MW-2 5/18/2020 2 15-30 30 21.91 NM NM TABLE B-7 WELL CONSTRUCTION INFORMATION PAGE DISTRIBUTING COMPANY SITE NCDEQ INCIDENT NO.: 45292 PHASE I LIMITED SITE ASSESSMENT APPENDIX A BORING LOGS AND WELL CONSTRUCTION RECORDS Remarks: Total Depth: 35.0' Project Manager: J. Ballsieper Casing Diameter: Hole Diameter: 6.25"Start Date: 5/18/20 Date: May 2020 Location: Winston-Salem, NC Page Dist Co Site Job No.: 1020075.001 Boring/Well ID: Geologist: 60 50 40 30 Drilling Method: Geoprobe - SSA 20 10 Sample ID Complete Date: 5/18/20 (feet)DepthRec/Adv(ppm)Blows (in)PIDGeologic Description LithologyWater TablePage 1 of 1 30 40 20 10 Well Diagram MW-1 60 50 Monitoring Well Installed to 35 feet bls 120 Fayette StreetWinston-Salem, North Carolina 27101(336) 722-9999 Concrete Ground Surface (17.0') #2Quartz Sand (15.0') 2"PVC Screen (20.0') 2"PVC Casing (4.0') GroutFill Material (14.0') Bentonite Light brown to light gray fine sand(Petroleum Odors) Remarks: Total Depth: 30.0' Project Manager: J. Ballsieper Casing Diameter: Hole Diameter: 6.25"Start Date: 5/18/20 Date: May 2020 Location: Winston-Salem, NC Project: Page Dist Co Site Job No.: 1020075.001 Boring/Well ID: Geologist: 60 50 40 30 Drilling Method: Geoprobe - SSA 20 10 Sample ID Complete Date: 5/18/20 (feet)DepthRec/Adv(ppm)Blows (in)PIDGeologic Description LithologyWater TablePage 1 of 1 30 40 20 10 Well Diagram MW-2 60 50 Monitoring Well Installed to 30 feet bls 120 Fayette StreetWinston-Salem, North Carolina 27101(336) 722-9999 Gravel Ground Surface (17.0') #2Quartz Sand (15.0') 2"PVC Screen (15.0') 2"PVC Casing (4.0') GroutFill material (14.0') Bentonite Light brown to light gray fine sand(Petroleum Odors) APPENDIX B STANDARD SAMPLING PROCEDURES EXHIBIT A Procedures for Developing the Monitoring Wells Well development will be performed no sooner than 24 hours after well construction is completed. Wells will be developed by bailing or pumping a minimum of five well-volumes of groundwater from the well. The turbidity, pH, specific conductivity, dissolved oxygen and temperature of the development water will be measured and recorded, and used as an indicator parameter to determine the completion of the development process. EXHIBIT B Procedures for Collecting Groundwater Samples Each well will be purged of three standing well volumes prior to sample collection to remove stagnant water from the well and well bore in an effort to collect samples that are representative of the water quality in the formation surrounding each well. Chemical preservatives, if applicable, will be added to sample bottles by the laboratory. Sample bottles will be labeled prior to sample collection. Sample bottles will be filled directly from the Teflon or disposable bailer. Volatile organic samples will be collected first. The pH, temperature, and specific conductance of the sample will be measured and recorded. These measurements will be taken from a sample deposited in a separate container. Visual characteristics of the sample, including insoluble materials, will be recorded. Caps will be secured on bottles, bottle will be placed in plastic bags and the bags will be sealed. Documentation, including Chain-of-Custody Record and laboratory analytical request form, will be completed for all samples. Samples will be packed in coolers with "bubble wrap" and ice packs for shipment. Chain-of-Custody Record and analytical request form will be placed inside cooler sealed with security tape. Samples will be shipped via overnight express to the analytical laboratory within 24 hours following collection. Laboratory will be advised of each sample shipment. APPENDIX C RETURNED WATER-SUPPLY QUESTIONNAIRES APPENDIX D LABORATORY TEST REPORTS AND CHAINS-OF-CUSTODY