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S- 04 <br /> �/. Delta <br /> Environmental <br /> Consultants,Inc. <br /> Solving environment-related business problems worldwide www deltaenv com <br /> 3164 Gold Camp Drive • Suite 200 <br /> Rancho Cordova, California 95670 USA <br /> 916 638 2085 800 477 7411 <br /> Fax 916 638 8385 L' [J �t D <br /> February 16, 2006 FE I l L06 <br /> Mr Harlin Knoll E[d4lIRO,`I"JEN F HEALTH <br /> San Joaquin County Environmental Health Department PERI€!r/SERViCES <br /> 404 East Weber Avenue 3rd Floor <br /> Stockton, California 95202 <br /> Subject Well Installation Report <br /> Former E-Z Serve Location No 100966 <br /> 2537 Waterloo Road <br /> Stockton, California <br /> Delta Project No RPMS0966 <br /> Dear Mr Knoll <br /> Delta Envii onmental Consultants, Inc (Delta) has been contracted by Restructure Petroleum Marketing <br /> Services of California, to conduct additional subsurface investigation at the property located at 2537 <br /> Waterloo Road in Stockton, California Delta proposed the scope of work in our Subsurface Soil and <br /> Groundwater Investigation Work Plan, dated November 30, 2004 <br /> The purpose of this investigation is to evaluate the extent of horizontal and vertical petroleum <br /> hydrocarbon impact on groundwater off-site The location of the site is shown on Figure I and the site <br /> features are shown on Figure 2 <br /> Project Background Information <br /> According to ATC Associates, Inc (ATC), the underground storage tank (UST) system was removed in <br /> March 1990 The former UST system consisted of one 8,000-gallon gasoline UST, three 10,000-gallon <br /> gasoline USTs, and one-fuel dispenser island Based on field observations and analytical results it <br /> appears that the USTs were suspected to be the source of the release <br /> In August 1991, Nachant Environmental Inc (NE) conducted an initial phase of assessment as a result of <br /> a suspected fuel system leak The assessment consisted of drilling three soil borings designated as B-1 <br /> through B-3 B-1 was advanced to a depth of 50 fe;,t below surface grade (bsg), and B-2 and B-3 were <br /> each drilled to a total depth of 41 5 feet bsg Elevated levels of fuel hydrocarbon constituents were <br /> detected in the 20 and 40-foot samples obtained from B-1 and the 35-foot sample collected from B-3 <br /> Chemical analyses of all other soil samples showed low concentrations or concentrations below the <br /> laboratory reporting limit <br /> In June and July 1992, Tank Protect Engineering (TPE) performed a subsequent phase of assessment <br /> Five groundwater monitoring wells (MW-1 through MW-5) were installed on site during this <br /> W1RPMS-CAVWoikmgTroaecti'lles1100966 Stockton 2537 Waterloo Road1lnvestigation <br /> A member of <br /> Xlnogeia* <br /> E,, .nmental AlLanc <br />