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iEXECUTIVE SUMMARY Interim Remediation Plan Insitu Soil Vapor Extraction System Ultramar Service Station No. 492 470 North Main Street, Manteca 6 February 1992 EVAX Technologies, Inc. (EVAX) has been retained by Ultramar Inc. (Ultramar) for soil remediation services as part of a continuing clean-up effort at Ultramar Station No. 492 located at 470 North Main Street in Manteca. The subject program represents the second phase of clean-up of fuel contaminated soils at this site. The fuel contamination apparently originated from tank overfill (s) from the gasoline retail operation conducted at this site. All underground fuel storage tanks are lined and have passed tank tightness tests. Several site characterization studies have been undertaken. These studies indicated that the contaminant plume is centered in the area of the underground fuel storage tanks. Site investigations also determined that remediation through insitu vapor extraction would be feasible in the soil at the site. The subject program represents an interim phase of remediation whereby extracted vapors will be destroyed with a catalytic incinerator. An initial phase of remediation was undertaken from 13 October to 17 November 1989 where the vapors were abated with an internal combustion engine. Approximately 1,950 pounds of hydrocarbons were extracted from the soil during this initial operation. Vapors will be vacuum extracted from four existing vapor recovery wells and one monitoring well . Underground piping connections to these wells were made during the initial phase of remediation. The subject operation involves reinstating remediation through this existing system with no new underground construction. Extracted vapors will be abated with a catalytic incinerator rather than the internal combustion engine used originally. - i -