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Geological Audit Services, Inc. <br /> 22911 Savi Ranch Parkway•Yorba Linda, CA 92687• (714) 283-0130• FAX (714) 283-0258 <br /> 21 March 1991 <br /> (GeoAudit CV 4304.1 1) <br /> Ms. Margaret Lagori.o, REHS MAR 2 7 1991 <br /> Public Health Services - San Joaquin County <br /> Environmental Health Division ENVIRONMENTAL HEALTH <br /> 1601 East Hazelton Avenue PERMIT/SERVICES <br /> Stockton, California 95201 <br /> Subject: Work Plan for Installation of Extraction Well at <br /> Genova Bakery - <br /> 749 North Sierra Nevada, Stockton, California <br /> Dear Ms. Lagorio: <br /> In accordance with the request of our client, the Estate of Angelo <br /> Rolleri, we have prepared this work plan to install a vapor <br /> extraction well at the referenced facility. <br /> BACKGROUND <br /> The site is located in a relatively flat commercial/residential <br /> area (Figure 1 - Location Map, 7 . 5 Minute Stockton West Quadrangle, <br /> USGS Topographic Series, 1976) . The depth to ground water was <br /> approximately 45 feet in mid-year 1989; however, by the end of <br /> 1989 , 55-foot deep wells at the subject site were dry. It is our <br /> understanding that the wells are still dry and that the current <br /> depth to ground water is approximately 60 feet. <br /> The fueling facility at the site consisted of a single 350 gallon <br /> underground storage tank and its associated fuel dispenser (Figure <br /> 2 - Site Plan) . This system was removed in 1987 . An unauthorized <br /> release of hydrocarbons was discovered during the tank removal. The <br /> impact of this release on the vadose and saturated zones was <br /> investigated by Groundwater Technology, Inc. (GTI) . In conjunction <br /> with this investigation GTT drilled seven soil borings and <br /> subsequently converted these borings to ground water monitoring <br /> wells MW--1 through MW--7 (Figure 2) . Vadose zone contamination is <br /> restricted to the immediate area below the former tank location <br /> (MW-2) . Free product was encountered in two wells (MW-1 and MW-2) . <br /> Water samples from the remaining wells did not indicate the <br /> presence of free product or dissolved hydrocarbon contamination <br /> (GTI project no. 202/799-5005. 01., report dated 21 November 1988) . <br /> It is our understanding that the San Joaquin County - Environmental <br /> Health Division (SJEHD) is requiring an active remedial action. <br /> Based upon operational considerations and soil type, an in--situ <br /> vacuum extraction appears to be the most cost-effective method. The <br /> current monitoring wells were designed to access only the saturated <br /> Environmental Services•Hydrogeology•Geotechnical Services <br />