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Ceolo ical rechlucs lac. <br /> 11617"Street <br /> Modesto,CaHfomia 95354 - <br /> (209)5224119/Fax#522-4227 <br /> Additional Site Characterization Work Plan <br /> Soil.and Groundwater Investigation <br /> Valentine (Castle Motors) <br /> 2315_ N. El Dorado Street <br /> Stockton, CA <br /> Project No. 723.2 <br /> March <br /> 1.0 INTRODUCTION <br /> In April 1987 the site's two 3,000-gallon gasoline underground storage.tanks (UST) and one <br /> 150-gall6n waste oil UST were removed(see,Figure 1: Area Map & Figure 2: Site Map). <br /> Analyses of soil samples from the UST excavations..revealed that a petroleum hydrocarbon <br /> release had occurred. The San Joaquin County.Environmental Health Division (SJC/EHD) <br /> subsequently directed Mr. Valentine to begin an investigation to�determine the extent of the <br /> petroleum release. <br /> The following is a summary of work performed at the site to date: <br /> In October 1993 four boreholes (SB-1 thra:SB-4) were placed around the location of the <br /> former waste oil tank. Results showed that all.soil samples, except for the 36466t sample <br /> from SB-2,were below detection limits for BTEX and TPH-G. <br /> In September 1994 monitoring well MW-I.:was installed at the site. Soil sample <br /> analytical results indicated the presence of BTEX and TPH-G in the soil to.a depth of 56 <br /> feet bgs. Waste oil-was-detected in the shallow soil samples: <br /> • In June 1995 two additional monitoring;wells, MW-2 &MW-3;:were installed at the site., <br /> Results showed the presence of high"levels, of BTEX and TPH-G in the soil and <br /> groundwater. <br /> ® In June 1996 three additional monitoring wells (MW-4;MW-5 &MW-6) and soil boring <br /> "SB-B" were installed at the site: Soil sainple analytical results indicated.the presence of <br /> significant levels of BTEX and TPH-G. The results also indicated that the pump-island <br /> was a major source of contamination. <br />