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s. <br /> t� <br /> i <br /> ft <br /> r.* <br /> EXECUTIVE SUHRARY <br /> Interim Remediation Plan <br /> -� Insitu Soil Vapor Extraction System <br /> Ultramar Service Station No. 502 <br /> 35 North Cherokee Lane, Lodi <br /> 6 February 1992 <br /> EVAX Technologies, Inc. (EVAX) has been retained by Ultramar Inc. <br /> (Ultramar) for soil remediation services as part of a continuing clean-up <br /> 4 effort at Ultramar Station No. 502 located at 35 North Cherokee Street in <br /> Lodi. The subject program represents the second phase of clean-up of <br /> fuel contaminated soils at this site. <br /> The fuel contamination apparently originated from tank overfill(s) from <br /> the gasoline retail operation conducted at this site. All underground <br /> ` gasoline storage tanks are lined and have passed tank tightness tests, A <br /> former 12,000 gallon diesel tank which failed the tank tightness <br /> replaced with art upgraded tank. test was <br /> =y Several site characterization studies have been undertaken. These <br /> studies indicated that the contaminant plume is centered in the area of <br /> the underground fuel storage tanks. Site investigations also determined <br /> that remediation through insitu vapor extraction would be feasible in the <br /> soil at the site. Depth to groundwater was approximately 52 feet at the <br /> time of the feasibility study. <br /> The subject program represents an interim phase of remediation whereby <br /> extracted vapors will be destroyed with a catalytic incinerator. An <br /> x initial phase of remediation was undertaken from 11 October to 8 November <br /> 1989 where the vapors were abated with an internal combustion engine. <br /> Approximately 1,695 pounds of hydrocarbons were extracted from the soil <br /> during this initial operation. <br /> ---- - - ------- ----- apors--wi 11--be- <br /> existing vapor recovery wails <br /> And two monitoring wells. Underground piping connections to these wells <br /> were made during the initial phase of remediation. The subject operation <br /> _ i , <br />