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_ PROBLEM ASSESSMENT REPORT <br /> January 1994 <br /> Art & Artists <br /> 204 E. Lodi Ave. <br />' Lodi, CA <br />' EXECUTIVE SUMMARY <br /> A 500-gallon underground storage tank (UST) containing gasoline was located inside a large <br /> commercial building at 204 East Lodi Avenue in Lodi, California until January 23, 1987.The <br /> tank removal was performed by Thorpe Oil Co. of Lodi, and witnessed by Laurie Cotulla <br /> of San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD). <br /> Gasoline contamination was detected in the soil, and PHSIEHD informed the owner of the <br /> property, Mrs. Mary Lelir, that a subsurface investigation was required to determine whether <br /> groundwater beneath the site had been impacted by the hydrocarbon release. <br /> it <br /> Three groundwater monitoring wells were installed by Weiss Associates in July 1987, and <br /> gasoline hydrocarbons were detected in water samples from all three wells. Soil <br /> contamination was detected in the well nearest the location of the UST. No further work <br /> was undertaken until November 1991, when Earth Systems Environmental attempted to <br /> measure the depth to groundwater and collect water samples from each of the monitoring <br /> M wells. However, due to four years of drought, water levels had dropped below the screened <br />'�' interval in two of the wells, and the third well contained free-phase gasoline on the water <br /> table. Therefore, no samples were collected. <br /> PHS%EHD subsequently required further investigation. Between .lune 1992 and April 1993, <br /> five additional monitoring wells were installed by Geological Audit Services (GeoAudit). <br /> Groundwater contamination was detected in two of the five wells. Groundwater quality and <br /> flow direction have been monitored on three occasions since June 1992, and the plume of <br />! contaminated groundwater has now been adequately delineated. No soil contamination was <br /> detected in any of the five wells, limiting the extent of soil contamination to the immediate <br /> vicinity of the former UST. <br /> A remediation well was installed through the plume of contaminated soil in August 1993, <br /> and a vapor extraction pilot test of this well was conducted in December 1993. Results of <br /> this test indicate that contamination levels and soil permeability are sufficient for in-situ <br /> vapor extraction to be an effective remediation technology at the site. In-situ bioremediation <br /> has not been tested, but is also likely to be effective in treating the vadose zone. Ex-situ <br /> j1 techniques are not feasible, because excavation of the contaminated soil would require <br /> demolition of the rear portion of the building. <br /> A <br /> O�,vE As&Servi e.,1w. <br /> A&A PARfl.z&Kn.17 i <br />'i <br />