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QUARTERLY REPORT <br /> April 1994 <br /> Yellow Submarine <br /> 140 West Harding Way <br /> Stockton, California <br /> 1.0 INTRODUCTION <br /> Geological Audit Services, Inc. (GeoAudit) has been retained by Ms. Deborah Reade, on <br /> behalf of the Campodonico and Tiscornia Trusts, to monitor groundwater conditions at the <br />' site of a former Exxon gasoline station. The station was located at the intersection of <br /> Harding Way and Madison Street in Stockton, California (the Site). Following the <br /> recommendation of Mr.Michael Infurna of the San Joaquin County Public Health Services - <br />' Environmental Health Division (PHS/EHj3), groundwater depths are monitored! onthly <br /> or bi-monthly and samplesf re collected''quarterly. The location of the site is illustrated in <br /> Figure 1. A plan of the site is illustrated in Figure 2. <br /> Also at the direction of the PHS/EHD, three additional groundwater monitoring wells were <br /> installed at or near the site in March 1994. This report details the monitoring well <br /> installation and soil and groundwater sampling procedures, and presents results of the <br /> groundwater monitorings. <br /> 2.0 BACKGROUND <br /> 2.1 Initial Investigations, 1990 - 1993 <br /> Investigation of the soil and groupc�vater conditions at the site have been ongoing since <br /> 1990. Between 1990 and 1993, four groundwater monitoring wells (MW-1 through MW-4) <br /> and numerous borings were drilled, and trenches or excavations were dug in several areas <br /> of the site. Petroleum hydrocarbon impacted soil was encountered in several of the <br /> excavations and orings, removed stockpiled on-site. Petroleum hydrocarbons were also <br /> detected in soil samples from MW-4 at depths of 21, 31 and 36 feet. However, no petroleum <br /> ' hydrocarbons were detected in the five sets of groundwater samples collected during this <br /> period. Based on these results, the previous consultant recommended that the site be closed <br /> without further assessment or remediation. <br /> d her assessment of the soil in the vicinity of - <br /> However, the PHS/EHD requested further ty MW 4. <br /> Additionally,.because of poor install ation/completion and unreliable groundwater depth data, <br /> the PHS/EHD also requested that MW-3 be destroyed and replaced by a new well. <br /> O"J.,"l A.&ServGm•I" 1 <br /> 67!-SRR+4VYrhw b.bxrirs <br /> r <br /> 1 <br />