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3.0 FACILITY BACKGROUND/WORK PLAN <br /> 3.1 SITE HISTORY <br /> The project site is currenr-1v vacant lot situated on the <br /> northeast corner California. Formerly, the <br /> r <br /> subject property ueveloped as a Chevron Service Station facility. The <br /> facility consisted of a service station building and canopy, underground fuel and <br /> waste oil storage tanks, product and vent piping, dispenser islands, planter beds <br /> and surface pavement. <br /> formed us that the service station facility was demolished <br /> in august of iytsy, and that the underground tanks and product piping were removed <br /> at the time. Prior to the site demolition, retained EA Engineering, <br /> Science, and Technology, Inc. (EA) to conduct a soli vapor survey. A report was <br /> issued which identified three underground tanks which were abandoned in place <br /> with sand and water. Also a cluster of three active underground tanks was <br /> r <br /> identified at a separate location on the subject property. <br /> Several additional environmental investigations were performed at the <br /> subject site. Petroleum hydrocarbons were found to be present in the contents <br /> of the abandoned tanks that were removed in June 1989. Contamination was also <br /> reported to exist in subsoils beneath one of the abandoned in-place tanks, <br /> beneath the southern dispenser island, and product piping associated with the <br /> southern dispenser island. <br /> Dames & Moore conducted a preliminary site characterization at the subject <br /> property which included performance of exploratory soil borings, subsoil <br /> sampling, installation of five groundwater monitoring wells, and chemical <br /> analysis of subsoil and groundwater samples. <br /> Dames & Moore found concentrations of petroleum hydrocarbons is subsoils <br /> ranging from non-detected to 640 parts per million (ppm) and concentrations in <br /> groundwater ranging from non-detected to 500 parts per billion (ppb) , with only <br /> one detection of benzene at 2 ppb. <br /> 3.2 PURPOSE AND SCOPE OF WORK <br /> The purpose of this investigation is to evaluate the subsurface <br /> hydrocarbons in subsoil and groundwater at the subject property in accordance <br /> with the criteria specified in the Regional Board Staff Recommendations for <br /> u <br /> 4 <br /> u <br />