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' EXECUTIVE SUMMARY Interim Remediation Plan Insitu Soil Vapor Extraction System Ultramar Service Station No. 502 35 North Cherokee Lane, Lodi 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. 502 located at 35 North Cherokee Street in Lodi . 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 gasoline storage tanks are lined and have passed tank tightness tests. A former 12,000 gallon diesel tank which failed the tank tightness test was replaced with an upgraded tank. ' 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. Depth to groundwater was approximately 52 feet at the time of the feasibility study. 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 11 October to 8 November 1989 where the vapors were abated with an internal combustion engine. Approximately 1,695 pounds of hydrocarbons were extracted from the soil during this initial operation. Vapors will be vacuum extracted from four existing vapor recovery wells and two monitoring wells. Underground piping connections to these wells ' were made during the initial phase of remediation. The subject operation - i -