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Home My WebLink AboutMO-4269_13403_CA_O_20190913_Receptor Survey Update* OT-TTUT DLD ENGINEERING, INC. Via: E-mail September 13, 2019 Ms. Trudy Beverly North Carolina Department of Environmental Quality 610 East Center Street, Suite 301 Mooresville, NC 28115 Subject: Updated Receptor Survey- Carolina Fast Mart #4 Pit Stop 3690 Concord Parkway, Concrod, NC Shield Project No. 1120116 Latitude - North 350 22'14.05"; Longitude - West 80 0 39' 56.88" Dear Ms. Beverly, Thank you for your recent inquiry about the receptor survey in our July 31, 2019 Monitoring Report for the Carolina Fast Mart #4 Pit Stop site. Based on discussions with our field services manager who conducted the last receptor survey in July 2019, Shield Engineering, Inc. (Shield) has since updated the receptor survey using Google Earth instead of the radii drawn on our original 1,500' Radius Map (Figure). Shield also reviewed the analytical data from WSW-1, the supply well approximately 590 feet from the site with previous detections of methyl tertiary butyl ether (MTBE) and diisopropyl ether (IPE). In addition we evaluated the nearby surface water bodies. All of these evaluations or re-evaluations have led to the findings below and a request for the North Carolina Department of Environmental Quality (NCDEQ) to lower the risk of the site to a Low Risk. FINDINGS Receptor Survey - The receptor re-evaluation has caused some revisions to our Table 1: Water Supply Well and Receptor Information and the attached Figure. Please see the attached. There is one possible water supply well (WSW-2 at 60 Pitts School Road) within 500 feet of the nearest source area on site. However, the existence of this well is uncertain. In the past there was a house at 60 Pitts School Road with a possible well house behind it. The house has been torn down and the well may have been abandoned/graded over. There are two water supply wells (WSW-1 and 8) beyond 500 feet but within 1,000 feet of the nearest source area on site. WSW-1 has not been used since 2018; they are connected to municipal water. WSW-8 is used for irrigation only. There are three water supply wells (WSW-3, 4, and 6) just beyond 1,000 feet from the nearest source area on site. WSW-3 is used for washing cars. WSW-4 and 6 are not in use. The next three nearest water supply wells observed are WSW-5, 7, and 9 which are all well beyond 1,000 feet from the nearest source areas at the site. A receptor survey update was performed in 2019 by Shield personnel in order to review the status of known receptors and present information on new receptors, if applicable. Shield personnel drove, walked, and reviewed maps of the area within 1,500 feet of the site. We talked to residents when available. Request for water supply well information surveys were sent to all known properties where water supply wells have been observed. Only four surveys were returned. Regarding the reconnaissance, the interviews, and the survey letter responses, we can only report what was readily Updated Receptor Survey September 13, 2019 Carolina Fast Mart #4, Concord, NC Page 2 visible, distances measured on maps, what the interviewed parties told us, and what was reported on the survey letters; we are not validating whether the information is correct. Figure 3 and Table 1 should not be used separately from this portion of the letter. If any additional information is obtained regarding the water usage within 1,500 feet of the site, Shield reserves the right to update our findings. WSW-1 Findings - Since 2016 the concentrations of MTBE and IPE have been below the 15A North Carolina 2L Groundwater Standards (2L Standards). WSW -I has been showing decreasing levels of MTBE and IPE since 2014. MTBE was 1 microgram per liter (µg/L) when last sampled in June, 2018. IPE was not detected for the last 4 semi-annual sampling events since 2016. See the "Summary of Historical Analytical Results — Groundwater Samples" in Table 4 attached. Sometime after the June, 2018 sampling event, a pipe in WSW-1 broke, the party(ies) who live at the property disconnected the electricity to the well, and the well is not being used. This was confirmed in July, 2019 by Shield's field services manager. Previous interviews with the owner(s) of the well were not successful in getting them to abandon their well and connect their car washing station to municipal water. We previously advised the property owners of concern relative to drinking water from this well, although the levels of MTBE and IPE are now below the 2L Standards. There are other petroleum fueling stations at this traffic intersection so we have always been uncertain of the true source of the MTBE and IPE in WSW-1. Surface Water - There is one drainage feature or drainage ditch adjacent to the site (and within 500 feet) which collects runoff from the site and perhaps the adjacent farm. It flows northwest under Pitts School Road and then into an unnamed intermittent drainage feature. Historically it appears that the unnamed intermittent drainage feature only contains water during rainy periods. The unnamed intermittent drainage feature ultimately flows into the Rocky River. This is not a blue lined stream on the United States Geological Survey (USGS) Topographical Map for the area. The other nearest surface water body is beyond 500 feet from the site. It is another unnamed intermittent drainage feature approximately 900 feet west of the site that flows into Coddle Creek. CONCLUSIONS Because of previous receptor information and previous groundwater contaminant level(s) being detected in supply well WSW-1, the site has been ranked by the NCDEQ as a "High Risk" site. Since 2016 the concentrations of MTBE and IPE have been below the 2L Standards. With the decreasing trend of the concentrations of MTBE and IPE in WSW-1 in WSW-1 it could easily be below detection levels now. Also, this well is no longer functional and is not being used. None of the other criteria for a High Risk site are present. The only surface water body within 500 feet of the site is an intermittent drainage feature with flowing water seemingly only during rainy events. It is not a blue lined stream on the USGS Topographical Maps. No other criteria would make the site an Intermediate Risk site. Based on these two criteria we respectfully request that the NCDEQ lower the Risk of the site to a Low Risk site. Updated Receptor Survey September 13, 2019 Carolina Fast Mart #4, Concord, NC Page 3 Based on information presented in the Comprehensive Site Assessment (CSA) Addendum, soil contamination in the form of benzene only was found near one former sidewall of the large UST excavation above the Soil -to -Groundwater (STG) Maximum Soil Contaminant Concentrations (MSCCs) but not above the Residential MSCCs. No soil contamination was found near the former diesel UST area above the STG or Residential MSCCs. All four samples collected from around the smaller UST excavation area exceeded the STG MSCCs for gasoline related constituents of concern (COCs) but none of these samples exceeded the Residential MSCCs. MMPE events were conducted in March 2014, April 2015, January 2016, October 2016, June 2017, November 2017, July 2018, and January 2019, which may have lowered the soil contaminant concentrations. If the NCDEQ lowers the Risk of the site to a Low Risk site it could be closed with a Notice of Residual Petroleum (NORP). The NCDEQ could advise us on whether it would be a NORP for groundwater only or soil and groundwater. Please advise us if the site risk can be lowered to a Low Risk site and if so if the NORP would be for soil, or soil and groundwater. If you have any questions regarding the content of this letter, please contact David Stoner of Shield Engineering, Inc. Thank you, Shield Engineering, Inc. ;a=e s ertsfelder Environmental Group Le4a' 't;. IV David A. Stoner, P.G., P Senior Principal i &EAL 1427 9t 0 cc: Mr. Robbie Barbour, Carolina Oil Company — via e-mail H:\Projects\2012\1120116-01 Carolina Fast Mart Pit Stop\Reports\MR July 2019\September, 2019 Receptor Evaluation Letter.doc 0 WSW-% ' 2 LEGEND SITE BUILDING • SOURCE AREAS N WATER SUPPLY WELL - USED FOR NON -POTABLE PURPOSES WATER SUPPLY WELL - IN USE FOR ALL PURPOSES WATER SUPPLY WELL - NOT IN USE CONNECTED TO MUNICIPAL WATER �} POSSIBLE WATER SUPPLY WELL - WELL T MAY BE ABANDONED / GRADED OVER ---------- INTERMITTENT DRAINAGE FEATURE 1\ i \ NOTES: 1. REFERENCE CABARRUS COUNTY GIS. 2. ALL LOCATIONS AND DISTANCES ARE APPROXIMATE. Table 1: Water Supply Well and Receptor Information Carolina Fast Mart #4 Pit Stop Concord, NC Already Distance from Referenced Supply Name Property Address Phone Number connected to Supply Well on Well use Date Depth of Depth of Diameter of Screened Willing to connect source area of Well No. City or County property? Installed Well Casing Well Interval to city water? release water? Not in Use - Kenneth & Donna Previously Irrigation & WSW-1 Blackwelder 3213 Perry Street, Concord NC 704-634-8664 Yes Yes Washing Vehicles, Unk Unk Unk Unk Unk Not in 2017 590 feet 2019 broken pipe & no electricity to well. Possible well Unk - House now torn WSNb'-2 DCF Properties, LLC 60 Pitts School Road NW, Concord NC N/A Yes with house down, well may be N/A N/A N/A N/A N/A N/A 335 feet observed in the abandoned/ graded past. over. WSW-3 Charles Strickland 80 Pitts School Road NW, Concord NC N/A Yes Yes Washing Vehicles Unk Unk Unk Unk Unk Unk 1,050 feet W SNb'-4 Scan, LLC 84, 88 Pitts School Road NW, Concord NC N/A Yes Yes Not in Use Unk Unk Unk Unk Unk Unk 1,060 feet WSW-5 Mark & Melia Gordon 99 Pitts School Road NW, Concord NC N/A Yes Yes Not in Use Mid'40-50's Unk Unk Unk Unk Unk 1,350 feet WSW-6 Charles & Margaret 91 Pitts School Road NW, Concord NC 704-791-0735 Yes Yes Not in Use 1900 30'-40' Unk Unk Unk Unk 1,150 feet Mauney WSW-7 DCCF Properties, LLC 12 Carpenter Court NW, Concord, NC N/A N/A Well House Vacant Property - NotObserved Unk Unk Unk Unk Unk Unk 1,750 feet in Use WSW-8 Leonard & Lurie Dover 3600 Concord Parkway S, Concord NC N/A Yes Yes Irrigation 1/27/2009 270' 46' 6.25" Unk Unk 585 feet WSW-9 Robert Morris 172 Pitts School Road SW, Concord N/A No Yes All Domestic Uses Unk Unk Unk Unk Unk Unk 1,300 feet NA=Not available or not applicable Unk = Unknown HAPmjects11999119900181Table 1 Supply Well Survey Table 9-19 (Autosaved) Page 1 of 1 Table 4: Summary of Historical Analytical Results - Groundwater Samples Carolina Fast Mart #4 Pit Stop Concord, Cabarrus County, NC NCDEQ GWI # 13403 Analytical Method--> EPA Method 6200B a Location Date Sampled ug/L1 ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L 2L Standards' 1 600 600 500 20 70 6 70 70 400 GCL' 5,000 260,000 84,500 85,500 20,000 70,000 6,000 25,000 30,000 28,500 TW-2 6/27/2002 ND ND ND ND ND ND NA NA NA NA 10/31/2012 ND ND ND ND 0.57 ND ND ND ND ND 9/4/2013 NS NS NS NS NS NS NS NS NS NS 4/1/2014 ND ND ND ND ND ND ND ND ND ND 10/21/2014 ND ND ND ND ND ND ND ND ND 6/8/2015 ND ND ND ND ND ND ND ND ND2/17/2016 ND ND ND ND ND ND ND ND ND ril 11/30/2016 ND ND ND ND ND ND ND ND ND 7/19/2017 ND ND ND ND ND ND ND ND ND 12/13/2017 ND ND ND ND ND ND ND ND ND ND 6/26/2018 ND ND ND ND ND ND ND ND ND ND 1/3/2019 ND ND ND ND ND ND ND ND ND ND 7/2/2019 ND ND ND ND ND ND ND ND ND ND WSW-1 4/1/2014 ND ND ND ND 29.9 0.87 ND ND ND ND 10/21/2014 ND ND ND ND 27.9 0.99 ND ND ND ND 6/8/2015 ND ND ND ND 40 0.57 ND ND ND ND 2/17/2016 ND ND ND ND 10.5 0.55 ND ND ND ND 11/30/2016 ND ND ND ND 9 ND ND ND ND ND 7/19/2017 ND ND ND ND 1.1 ND ND ND ND ND 12/13/2017 ND ND ND ND 1.4 ND ND ND ND ND 6/26/2018 ND ND ND ND 1 ND ND ND ND ND 1/3/2019 NS - No power to well; Owner states Were is a leak in well piping that will need to be repaired. 7/2/2019 NS - No power to well; Owner not at home. WIP14edW120120116Table 4 SummaryolHls(otical MaINlcal Resutls-Carolina Fa Mart PR Slop Page 5 of Beverly, Trudy From: David Stoner <dstoner@shieldengineering.com> Sent: Tuesday, September 17, 2019 2:19 PM To: Beverly, Trudy Cc: Danny Hefner; James Gamertsfelder; RobbieBarbourl3@gmail.com Subject: [External] RE: Pitt Stop BP - Incident #13403 Attachments: Updated Receptor Evaluation Letter.pdf external email. Do not click links or open attachments unless you verify. Send all sus Thank you Trudy for the reminder. Please find attached our Updated Receptor Survey. Please review the letter because in it we have requested the NCDEQ to lower the risk of the site to Low Risk so that hopefully we can close the site with a Notice of Residual Petroleum. Best regards, David David A. Stoner, P.G., P.E. Sr. Principal/Vice President Shield Engineering, Inc.'s Risk Management Group 4301Taggart Creek Rd. Charlotte, NC 28208 ph. (704) 394-6913 fax (704) 394-6968 e-mail DStonerPShieldEngineeringcom Shield Engineering's Action Environmental Group is now Shield Engineering's Risk Management Group with additional expertise and service lines! �1HLD EN6INEERiNU.. 10C. www.ShieldEngineering.com This message is intended only for the use of the addressee and may contain information that is PRIVILEGED and CONFIDENTIAL, and/or may contain ATTORNEY WORK PRODUCT. If you are not the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please erase all copies of the message and its attachments and notify us immediately. Thank you. From: Beverly, Trudy [mailto:trudy.beverly@ncdenr.gov] Sent: Tuesday, September 17, 2019 1:42 PM To: David Stoner Cc: Danny Hefner; James Gamertsfelder Subject: RE: [External] FW: Pitt Stop BP - Incident #13403 David, Are the revised receptor table and map completed for Pitt Stop BP in Concord? Thanks, Trudy Trudy Beverly, L.G. Hydrogeologist, Division of Waste Management moo D, E Q North Carolina Department of Environmental Quality UST Section, Mooresville Regional Office 704.235.2182 (Office) Trudy. B everly&ncdenr. gov Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Office Mailing Address: 610 East Center Avenue, Suite 301 Mooresville, NC 28115 Branch's Underground Storage Tanks Website Address: https://deq.nc.gov/about/divisions/waste-management/ust Branch's Above Ground Storage Tanks Website Address: h_ptt s://deg.nc.gov/about/divisions/waste-management/ust/ast-program INTERACTIVE MAPS WITH DWM SITES AND PERMITTED FACILITIES: hops://deg.nc.gov/about/divisions/waste-management/waste-management-rules-data/waste-mana eg ment ig s=maps File Review Procedures: hops://deg.nc. gov/about/divisions/waste-management/ust/file-review-procedures#mooresville-regional-office ONLINE ACCESS TO UST SECTION DOCUMENTS (Laserfiche): hi!ps://edoes.deq.nc.gov/WasteManaaement/Search.asox Document Submittal & UST File Names for Laserfiche Policies: hops://files.nc. gov/ncdeq/Waste%20Management/D WMJUST/Corrective%2OAction/Electronic%2ODocument%2OSubmittal%2OMemo%2OUpdate.pdf https://files.nc. gov/ncdeq/Waste%2OManagement/DWMfUST/Corrective%2OAction/UST%20file%20names%20for%2OLaserfiche.docx Beverly, Trudy From: Beverly, Trudy Sent: Thursday, September 5, 2019 1:53 PM To: David Stoner Cc: Danny Hefner; James Gamertsfelder Subject: RE: [External] FW: Pitt Stop BP - Incident #13403 Thanks David. Trudy From: David Stoner [mailto:dstoner@shieldengineering.com] Sent: Thursday, September 5, 2019 1:05 PM To: Beverly, Trudy <trudy.beverly@ncdenr.gov> Cc: Danny Hefner <dhefner@shieldengineering.com>; James Gamertsfelder <jamertsfelder@shieldengineering.com> Subject: [External] FW: Pitt Stop BP - Incident #13403 External email. Do not click link ^r ^non �tt�rhmcntc i�nlccc vni� vnri chment to report.spam@nc.gov Good afternoon Trudy, Matt Smith isn't with Shield anymore. I'll get back to you regarding your question when the Technician that did the recent receptor survey at PT Stop BP gets back from the field and I can review it with him. The table has at least 2 typographical errors including the one you noticed. We'll revise it and possibly the associated figure and send the revised back to you asap. Best regards, David David A. Stoner, P.G., P.E. Sr. Principal/Vice President Shield Engineering, Inc.'s Risk Management Group 4301Taggart Creek Rd. Charlotte, NC 28208 ph. (704) 394-6913 fax (704) 394-6968 e-mail DStonergShieldEn in_ e�ering com Shield Engineering's Action Environmental Group is now Shield Engineering's Risk Management Group with additional expertise and service lines! ANIELD EI www.ShieldEnaineerina.com This message is intended only for the use of the addressee and may contain information that is PRIVILEGED and CONFIDENTIAL, and/or may contain ATTORNEY WORK PRODUCT. If you are not the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please erase all copies of the message and its attachments and notify us immediately. Thank you. From: Beverly, Trudy <trudy.beverly@ncdenr.gov> Sent: Wednesday, September 4, 2019 2:56 PM To: Matthew Smith <MSmith@shieldengineering.com> Subject: Pitt Stop BP - Incident #13403 Hey Matt, I'm reviewing the July 31, 2019 Monitoring report for Pitt Stop BP located at 3609 Highway 29 S., Concord, Cabarrus County, NC (Incident #13403). WSW-8 is listed on the Water Supply Well and Receptor Information table (Table 1) as being 50 feet from the source area. This does not match the location on the 1,500' Radius Map (Figure 3) of the report. Please check these and get back with me. Thanks, Trudy Trudy Beverly, L.G. Hydrogeologist, Division of Waste Management North Carolina Department of Environmental Quality Q �� " `ry UST Section, Mooresville Regional Office 704.235.2182 (Office) Trudy. B everlygncdenr. gov Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Office Mailing Address: 610 East Center Avenue, Suite 301 Mooresville, NC 28115 Branch's Underground Storage Tanks Website Address: https://deq.nc.gov/about/divisions/waste-management/ust Branch's Above Ground Storage Tanks Website Address: htt2s:Hdeq.nc.gov/about/divisions/waste-mana2ement/ust/ast-prog INTERACTIVE MAPS WITH DWM SITES AND PERMITTED FACILITIES: httDs:Hdeu.nc. eov/about/divisions/waste-manaeement/waste-manaeement-rules-data/waste-manaeement-ais-mans File Review Procedures: https://dca. nc.,ov/about/divisions/waste-manaeement/ust/file-review-procedures#mooresville-regional-office ONLINE ACCESS TO UST SECTION DOCUMENTS (Laserfiche): httos://cdocs.dcq.nc.gov/WastcManagcmcnt/Scarch.aspx Document Submittal & UST File Names for Laserfiche Policies: https:Hfiles.nc. gov/ncdeq/Waste%2OManagement/DWM/UST/Corrective%2OAction/Electronic%2ODocument%2OSubmittal%2OMemo%2OUpdate.pdf https:Hfiles.nc. gov/ncdeq/Waste%20Management/DWM/UST/Corrective%2OAction/UST%2Ofile%20names%20for%2OLaserfiche.docx