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w./ V <br /> SUM1%1ARY OF <br /> SOIL AND GROUNDWATER INVESTIGATIONS <br /> 200 N. BECKMAN STREET <br /> LODI, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This report presents a summary of all soil and groundwater investigations conducted at the San <br /> Joaquin County Mosquito and Vector Control District (SJCMVCD) facility at 200 North <br /> Beckman Street in Lodi, California. The details of each of these investigations has been <br /> presented in previous reports. The summary will be used by Roy F. Weston (WESTON) to <br /> develop a Corrective Action Plan for residual petroleum impacted soil at the site. <br /> 2.0 1986-1987 Investigation <br /> In 1986, the SJCMVCD removed three underground storage tanks (USTs) from the site and <br /> excavated soil beneath the gasoline UST to a depth of 31 feet below ground surface (bgs). A <br /> soil and groundwater investigation conducted by Weiss Associates on behalf of the SJCMVCD <br /> in 1987 consisted of completion of six soil borings and the installation of three groundwater <br /> monitor wells (MW-1, MW-2 and MW-3) to a depth of approximately 50 feet (See Figure 1). <br /> The soil and groundwater analytical results from the 1986 tank removals and additional <br /> investigations completed in 1987 are included in Tables 1 and 2. Soil and groundwater samples <br /> were analyzed for total fuel hydrocarbons MHC), benzene, toluene, ethylbenzene, xylene <br /> (BTEX), and lead. While the investigation identified the presence of petroleum hydrocarbon <br /> compounds in soil to a depth of 31 ft. bgs. beneath the location of the former gasoline UST, <br /> petroleum hydrocarbon compounds were not detected in groundwater samples from the three <br /> monitor wells. Analytical data from soil samples collected from boring locations B-3 and B-4, <br /> as well as Organic Vapor Analyzer data from MW-2 soils were non-detect for BTEX and TFHC <br /> at the 41 ft. depth. <br /> Note that fuel contaminated soils associated with the former USTs have been removed to a depth <br /> of 31 feet below grade, therefore, the shaded results in Table 1 are for soils that are no longer <br /> present at the site. <br /> 3.0 1991-4993_Quarlerly_Monitoring <br /> WESTON began a quarterly groundwater monitoring program on behalf of the SJCMVCD in <br /> December 1991. Only one of the three existing monitor wells at the site was found to have <br /> enough water to sample in December 1991. Consequently, the EHD requested that an additional <br /> 1 <br />