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Home My WebLink AboutMO-29867_48962_CA_SCSC_20230420_Site Cleanup Site ClosureCEDAR ROCK ENVIRONMENTAL, P.C. 107 Pioneer Trail Graham, NC 27253 (336) 684-2734 April 20, 2023 Mr. John Thomson 356 Grove Street Salisbury, NC 28144 RE: Underground Storage Tank (UST) Closure Assessment Report 356 Grove Street, Salisbury, North Carolina Cedar Rock Project Number 363322590 Dear Mr. Thomson: Cedar Rock Environmental, P.C. (Cedar Rock) is pleased to submit this report describing activities and results for the in-place abandonment of the onsite UST located at 356 Grove Street in Salisbury, North Carolina. The UST abandonment was performed on April 20, 2023. Included in this report are project documents consisting of a disposal manifest and photographic documentation. This report should be kept with other documents pertaining to the residential property. Soil contamination was detected beneath the UST during a site inspection performed on April 11, 2023. The release was reported to the Department of Environmental Quality (DEQ) using a UST- 61 form on April 12, 2023. Although the State no longer requires further assessment of the contamination, the State does require the filing of a Notice of Residual Petroleum (NRP) prior to conveying the property to another party. The NRP includes land use restrictions prohibiting any disturbance of site soils within a specified radius of the estimated extent of soil contamination and prohibits the use or installation of any water supply wells on the property. Cedar Rock is in the process of filing the NRP. The DEQ will issue a Conditional Notice of No Further Action (NFA) letter within the next few days. Upon receipt of proof that the local officials and adjacent property owners have been notified of the release by receiving a copy of the Conditional NFA letter, and that the NRP has been filed, the DEQ will reissue the NFA letter with no conditions to officially close out the petroleum release incident. Enclosed is an invoice for this work effort. If you have any questions, please do not hesitate to contact me at 336-684-2734. Thank you for your consideration of Cedar Rock to provide you with this service. Sincerely, Robert A. Payne, L.G. President Attachments Cedar Rock ENVIRONMENTAL UNDERGROUND STORAGE TANK CLOSURE ASSESSMENT REPORT FOR 356 GROVE STREET SALISBURY, NORTH CAROLINA Prepared for: Mr. John Thomson Salisbury, North Carolina Prepared by: Cedar Rock Environmental, P.C. 107 Pioneer Trail Graham, North Carolina _____________________ Robert A. Payne, L.G. President April 20, 2023 CR #363322590 i TABLE OF CONTENTS Section Page No. 1.0 INTRODUCTION 1 2.0 PROJECT 1 FIGURE 1 Site Map APPENDICES A Fluid Disposal Manifest B Photographic Documentation ii I hereby certify this 20th day of April 2023 that this report was prepared by me or under my direct supervision. Robert A. Payne, L.G. Geologist 1 1.0 INTRODUCTION Cedar Rock Environmental, P.C. (Cedar Rock) was contacted by Mr. John Thomson of Salisbury, North Carolina to abandon in-place an underground storage tank (UST) located at 356 Grove Street in Salisbury, North Carolina. The UST was first inspected on April 11, 2023. An inactive UST was observed to be located as shown in the Site Map. Both the fill and vent pipes of the UST were observed to be intact and flush with the ground surface. The depth to the top of the UST is approximately 24 inches below land surface (bls). The UST has a length of about 94 inches with a diameter of approximately 41.25 inches and a capacity of about 560 gallons. The UST was measured to contain approximately 236 gallons of fluid. White flagging was installed to mark both ends of the UST (see Photo 1). No other USTs used for storing heating oil were discovered on the property using a metal detector to survey the outside perimeter of the residence where USTs are usually located. Two copper fuel delivery/return lines were observed extending across the crawlspace and going into the basement. The lines ran along the base of the basement foundation wall and were cut and crimped at the former furnace location. No petroleum odor was observed in the crawlspace or basement. Once the orientation of the UST was determined, two soil borings were performed, one at each end of the tank, using a ¾-inch diameter drill auger. Both borings were advanced to a depth of approximately 5.8 feet bls, about 0.3 feet below the bottom of the tank. No petroleum odor or discoloration was observed in the soils from the boring on the eastern end of the tank, however, a strong petroleum odor and local discoloration was observed in the soils on the western end of the tank from a depth of approximately 5.0 to 5.8 feet bls suggests significant leakage from the UST has occurred. The native soils underlying the tank consist of a grayish brown sandy silt. 2.0 PROJECT The in-place abandonment of the UST was performed on April 20, 2023. The abandonment consisted of the hand excavation of the soils overlying the eastern end of the UST to expose the topside of the tank. A hole approximately 1.5 feet in diameter was then cut on the top of the UST to allow for removal of the tank contents, cleaning and visual inspection of the UST interior, and subsequent filling. The tank was pressure washed to remove all residual petroleum sludge. Residual oil in the fuel lines was also removed by vacuum. The fuel lines were removed from the basement and crawlspace areas. Approximately 266 gallons of fluid and sludge (including rinsate) were removed from the UST. The fluid disposal manifest for the tank contents is included in Appendix A. After the interior of the UST was cleaned, the tank was then entirely filled with an excavatable flowable fill cement slurry. Once filled, the exposed portion of the UST was then covered with site soils (see Appendix B - Photographic Documentation). FIGURE SITE MAP PROJECT: ____________________________CEDAR ROCK ENVIRONMENTAL, P. C.SITE MAP INCIDENT #: __________________________ LOCATION: ___________________________ ___________________________ CRE PROJECT NUMBER: _______________ FILENAME: ____________________ VERSION DATE: ________________ : T1 = 560-Gallon UST John Thomson Property Pending 356 Grove Street Salisbury, Rowan Co. 363322590 3633-Fig1.tcw 4/20/2023 N FIGURE 1 0 5 10 20 1 inch = 10 feet House T1 Covered back porch Front porch APPENDIX A FLUID DISPOSAL MANIFEST APPENDIX B PHOTOGRAPHIC DOCUMENTATION Photo 1. View of the UST site prior to abandonment activities. Photo 2. View of the UST interior prior to the removal of tank contents. Photo 3. View of the UST interior after the removal of UST contents and pressure wash cleaning of the tank interior. Photo 4. View of the UST being filled with flowable fill cement slurry. Photo 5. View of the UST after filling with flowable fill cement slurry. Photo 6. View of the UST site after the completion of abandonment activities.