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TECHNOLOGIES,INC. � <br /> 269 Mount Hermon Rd. <br /> Suite 101 <br /> Scotts Valley,CA 95066 <br />! (408)438.7511 <br /> FAX(408)438.7515 <br /> j <br /> I, <br /> F 11 February 1991 <br /> I <br /> 'i. <br /> Mr. Glenn Dembroff <br /> k <br /> Ultramar Inc. p <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> SUBJECT: Beacon Station #0502, 35 North Cherokee Lane, <br /> Lodi , California <br /> 'i <br /> Dear Mr. Dembroff: <br /> 'i <br /> EVAX Technologies, Inc. EVAX is { <br /> (EVAX) pleased to submit this summation of <br /> remediation efforts performed by EVAX at the request of Ultramar Inc. <br /> (Ultramar) at the subject site. This report provides an overview of <br /> remediation efforts, a description of the system equipment, its operation <br /> and maintenance, and the system monitoring prgram. <br /> F <br /> OVERVIEW <br /> The subject site is an operating Beacon service station located at the <br /> corner of North Cherokee Lane and Elm Streetlin Lodi , California. A Soil <br /> Gas Survey and Performance Test were conducted by EVAX on 8 August 1989. <br /> Hydrocarbon concentration as vapor was recorded at the five wells used in <br /> the subsurface investigation. The results of the Performance Test <br /> indicated that the soil conditions were amenable to vapor extraction. <br /> The vapor extraction system installation was completed in August 1989. <br /> Operation began on 11 October 1989. The iditial influent concentration l 1 <br /> of total hydrocarbon concentration as vapor (TVH) was 22,500 parts per <br /> million (ppm) or 85 pounds per day. The combustion unit operated <br /> continuously for 29 days, 24 hours per day J A summary of the monitoring <br /> data is enclosed. A final reading was taken at the site on 8 November <br /> 1989. Influent concentration was 2,500 ppm1,or 23.7 pounds per day. The <br /> combustion unit was removed on 8 November 1989. Approximately 1,700 <br /> pounds of hydrocarbons were extracted and abated during the remediation <br /> project. <br /> 'i. <br /> SYSTEM EQUIPMENT <br /> i <br /> The system equipment includes an internal combustion engine and pump <br /> unit, collectively referred to as the ,i combustor unit, and an <br /> i <br />