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V 19 October 2012 AGE-NC Project No. 97-0312 Page 3 of 22 2.3. UNDERGROUND STORAGE TANK REMOVAL Three 500-gallon waste oil tanks were removed from the site prior to 1990. Details of the waste oil UST removals were not readily available to AGE. Unauthorized releases of hydrocarbons were reported from fuel piping at the site on three occasions in 1988 and 1989. The EHD subsequently required investigation of the extent of impacted soil and groundwater. On 18 September 1997, six product USTs were removed from the site. A total of nine UST soil samples and thirteen piping/dispenser soil samples were collected and analyzed.Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) were detected in the samples collected beneath the USTs at concentrations as high as 2,500 milligrams per kilogram (mg/kg) and 32,000 mg/kg, respectively. TPH-g and TPH-d were detected in piping/dispenser samples at concentrations as high as 1,200 mg/kg and 16,000 mg/kg, respectively. Excavation of approximately 400 cubic yards of hydrocarbon-impacted soil was performed after removal of the USTs. Excavated soil was stockpiled on site. On 16 March 1998, approximately 180 cubic yards of impacted soil was disposed; the remaining clean soil was used as backfill. The average hydrocarbon concentration of the disposed soil was 293 mg/kg of gasoline and 2,529 mg/kg of diesel. Approximately 141 pounds, or 23 gallons of gasoline and approximately 1,219 pounds, or 174 gallons of diesel were removed through soil excavation. The mass calculation was presented in the AGE prepared Quarterly Report- ,,� Fourth Quarter 1999, dated 10 March 2000. 6«1'44rcd' +/cd N /yi W 76fi �✓ /, Zl t1 & e<% 2.4. PREVIOUS SITE INVESTIGATIONS Site assessment activities summarized below were originally reported in quarterly reports prepared by Environmental Science & Engineering, Inc. (ESE) between June 1990 and February 1997 and by AGE between March 1997 and May 2001. A list of historical reports referenced in preparing this summary was presented in Appendix A of the AGE-prepared Problem Assessment Report, dated 16 August 2001. Soil and grab groundwater analytical tables are presented in Appendix C. The following is a summary of significant assessment activities conducted to date at the Cherokee Truck Stop site: • May 1990 - Review of EHD files for the site indicated fourteen soil borings (131 through B13, HA-1) were advanced near the UST, piping and dispenser areas to assess the lateral and vertical extent of impacted soil. Petroleum hydrocarbon compounds were detected in 15 of the 20 samples collected from the borings. TPH-g and TPH-d were detected at concentrations as high as 5,800 mg/kg and Advanced GeoEnvironmental,Inc.