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BRA hydrocarbons(TPH)were detected at 28,000 micrograms per liter(µg/L) in soil vapor collected near the former gasoline USTs The waste oil tank failed the integrity test As a result,the contents of the tank were pumped out and the tank inlets were sealed September 1990, Preliminary Site Assessment- Leedshill-Herkenoff, Inc conducted a preliminary site assessment to evaluate the extent of hydrocarbon contamination of site soil and groundwater Eight soil borings (SBI through SBS) were drilled and three groundwater monitoring wells (MW I through MW3)were installed Significant concentrations of TPH as gasoline(TPHg,at up to 14,000 milligrams per kilogram [mg/kg])were detected in soil from borings MW2,SB3,and S134,all located in the vicinity of the former tank pit The maximum benzene concentration detected was 0 9 mg/kg No hydrocarbons were detected in soil from boring S136, located adjacent to the waste oil tank The maximum TPHg and benzene concentrations detected in site groundwater were 540 parts per billion (ppb) and 100 ppb, respectively, in well MW-3 1991, Groundwater Monitoring Well, Recovery Well, and Soil Vapor Extraction System Installation RESNA Industries, Inc installed groundwater monitoring wells MW-4 and MW-5, recovery wells RW-1 and RW-2, vapor extraction wells VEW-1 through VEW-4, and a soil vapor extraction (SVE) system at the site The SVE system initially utilized an internal combustion (IC) engine In March 1992, the IC engine was replaced by a thermal oxidation unit, which was subsequently replaced by an activated vapor-phase carbon unit in July 1992 During 1992,the SVE system removed approximately 1,615 pounds of TPHg from the site ® September 1992, Evaluation of SVE System RESNA drilled borings CB-1 through CB-9 in the vicinity of the former UST pit Soil samples were analyzed for TPHg and benzene, toluene, ethylbenzene,and total xylenes(BTEX) With the exception of 0 05 parts per million(ppm)of total xylenes detected in soil from CB-7, no hydrocarbons were detected in borings CB-1 through C13-7 Borings CB-8 and CB-9 contained 4,600 ppm and 3,500 ppm of TPHg, although no benzene was detected in either boring March 1993, Groundwater Extraction System Operation• Fugro West, Inc (Fugro) operated a groundwater extraction system that pumped groundwater from recovery wells RW-1 and RW-2 Between March 1993 and October 1995,the system pumped over 5,772,000 gallons of groundwater and removed approximately 5 8 gallons of TPH This recovery ratio indicates that TPH comprised only 0 0001 percent of the total volume of fluids pumped from the site June 199.,; Groundwater Oxidation System Installation•Fugro upgraded the site remediation system in July 1994 by installing a groundwater oxidation(GWO)system Operation of the SVE and G WO systems was terminated on August 21, 1996 The series of SVE systems used at the site removed a total of approximately 3,277 pounds of TPH from soil vapor under the site April 1996, Remedial Action Evaluation Enviros Inc drilled eight soil borings adjacent to previously installed wells and borings The borings were drilled to evaluate the effectiveness of remedial actions at the site Twenty-nine soil samples were collected and analyzed for TPHg,BTEX, and methyl tertiary butyl ether (MtBE) TPHg was detected in only four of the soil samples in concentrations ranging from 1 4 to 970 ppm No BTEX or MtBE were detected in any of the samples