Commercial UST Removal, Pitt County

One 8000-gallon, one 6000-gallon, and four 3000-gallon gasoline underground storage tanks (USTs) were removed from a service station in May of 2008.  GMA supervised removal of the UST system, and we performed all required environmental assessment.  Approximately 582 tons of contaminated soil were excavated from the tank basins and the fuel dispenser island. Some inaccessible soil contamination remained above the water table at approximately 10 feet below grade adjacent to the excavation areas. A 2-Day Report was submitted to DENR in July of 2008.  In August of 2008, GMA installed and sampled permanent monitoring wells at the former UST basin, along the product lines trench, and at the former dispenser island.  Multiple petroleum-related contaminants were detected in the monitoring well samples at concentrations exceeding the 15A NCAC 2L Groundwater Quality Standards.  An Initial Abatement Action Report was completed in early September of 2008, and a Phase I LSA was submitted on September 30, 2008.  The DENR ranked the site as Low Risk (L135D) in October of 2008 and suspended additional site activities. DENR reactivated the incident in March of 2012 and requested completion of a Notice of Residual Petroleum (NORP). GMA completed all NORP requirements, filed public notification, abandoned the groundwater monitoring wells, and mailed final copies to NCDENR and our client.  NCDENR issued a Notice of No Further Action for the incident in May of 2012, and a final reimbursement claim was submitted to DENR’s Leaking UST Trust Fund in June of 2012.  GMA performed all required activities as quickly as the regulatory system allowed.