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HomeMy WebLinkAboutWS-29702_48827_CA_TCR_20230120CEDAR ROCK ENVIRONMENTAL, P.C. 107 Pioneer Trail Graham, NC 27253 (336) 376-0394 January 20, 2023 Mr. Richard Needham P. O. Box 10241 Greensboro, NC 27404 RE: Underground Storage Tank (UST) Closure Assessment Report 1126 Westridge Road, Greensboro, North Carolina Cedar Rock Project Number 354122590 Dear Mr. Needham: 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 1126 Westridge Road in Greensboro, North Carolina. The UST abandonment was performed on January 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 November 2, 2022. The release was reported to the Department of Environmental Quality (DEQ) using a UST-61 form on January 10, 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 filed the NRP on January 13, 2023. The DEQ issued a Conditional Notice of No Further Action (NFA) letter on January 13, 2023. 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 336-376-0394. 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 1126 WESTRIDGE ROAD GREENSBORO, NORTH CAROLINA Prepared for: Mr. Richard Needham Greensboro, North Carolina Prepared by: Cedar Rock Environmental, P.C. 107 Pioneer Trail Graham, North Carolina _____________________ Robert A. Payne, L.G. President January 20, 2023 CR #354122590 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 January 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. Richard Needham of Greensboro, North Carolina to abandon in-place an underground storage tank (UST) located at 1126 Westridge Road in Greensboro, North Carolina. The UST was first inspected on November 2, 2022. An inactive UST was discovered to be located as shown in the Site Map. Neither the fill nor vent pipes to the UST were observed. The depth to the top of the UST is approximately 16 inches below land surface (bls). The UST has a length of about 74 inches with a diameter of approximately 46 inches and a capacity of about 550 gallons. The contents of the UST could not be determined as there was no access available to the interior of the tank, however, based on sounding with a probing rod, the tank does not appear to be full. 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 in the basement extending up from the concrete floor about 4 feet. One of the lines was open-ended and the other valved closed. No petroleum odor or staining was observed in the basement. Once the orientation of the UST was determined, a soil boring was performed at the northeastern end of the tank using a 3.25-inch diameter stainless steel hand auger. The boring was advanced to a depth of approximately 5.25 feet bls, about the bottom of the UST. A strong petroleum odor was observed in the soils from a depth of approximately 4.0 to 5.25 feet bls suggesting significant leakage from the UST has occurred. The soils at the base of the boring consist of a reddish orange silt. 2.0 PROJECT The in-place abandonment of the UST was performed on January 20, 2023. The abandonment consisted of the hand excavation of the soils overlying the center 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 UST was measured to contain approximately 124 gallons of fluids. The tank was pressure washed to remove all residual petroleum sludge. Vacuum was applied to the fuel lines in an attempt to remove residual fuel. The fuel lines were removed from the basement area. Approximately 154 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 = 550-Gallon UST Ethel C. Fulton Revocable Trust Property 48827 1126 Westridge Road Greensboro, Guilford Co. 354122590 3541-Fig1.tcw N FIGURE 1 0 5 10 20 1 inch = 10 feet T1 House Porch Deck 1/20/2023 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.