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Executive Summary Ex-situ Bioremediation 3437 Newton Road, Stockton, California Two underground fuel storage tanks were removed from the Thomas Yard site, 3437 Newton Road, Stockton in January of 1989 by Jim Thorpe Oil. Soil samples were collected from beneath the tanks and piping,in accordance with permit requirements for underground tank removal in San Joaquin County. Soil sample analyses reported Total Petroleum Hydrocarbons, as diesel concentrations at a maximum of 5,500 parts per million. Two soil samples reported detectable Total PetroleuHydrocarbons as gasoline at concentrations of 12 and 2,200 parts per million. Bem nzene was not detected in any of the samples and the analytical results are interpreted as diesel fuel. Ethylene dibromide was analyzed for and reported as nondetectable in all samples. Lead was also analyzed for and reported at or below 9 parts per million. This lead concentration is well below the state designated Total Threshold Limit Concentration of 1,000 parts per million. The excavation at the site remained open from January 1989 through November 1990. In November 1990 Environmental Science & Engineering, Inc. (ESE) was retained by the owner, Delta Truck Sales, to investigate the former underground tank site by drilling and remove impacted soil by excavation. In October 1990 ESE drilled soil borings to define the limits of impacted soil. Impacted soil was removed by excavation and stockpiled on site. All soil containing elevated concentrations of hydrocarbons was removed from the subsurface. Approximately 800 cubic yards of soil was added to the stockpiled soil at the site. A report of the drilling and excavation activities entitled "Report of Soil Investigation and Overexcavation Around Former Underground Tanks at Thomas Yard, 3437 Newton Road, San Joaquin County, Stockton, California", was issued November 8, 1990 by ESE. In this report ESE recommended closure of the subsurface underground tank area. In July of 1992, Cecchini, Cecchini& Giovannoni took on ownership of the property. These new owners, are actively seeking to clean the site. ESE, on behalf of Cecchini, Cecchini, and Giovannoni have proposed onsite remediation of the stockpiled soil from the former Thomas Yard underground tank area. The stockpiled soil was sampled by ESE in August of 1992 in order to determine the current concentrations of hydrocarbons in the stockpile soil and formulate a remedial plan. Soil samples were analyzed for TPH as gasoline, diesel, BTEY, metals and bioassay. Analytical results for the composite soil samples analysis showed nondetectable TPH concentrations as gasoline and TPH as diesel ranging from 24 to 1,900 milligrams per Kilogram (mg/kg). Metals analyses were all below regulatory limits and the fish bioassay showed the material to be nonhazardous. These analyses verified that the soil does not contain volatile fuel components. The soil can be classified as nonhazardous.