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t . <br /> i � g ��recces lac. <br /> 017"Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 . <br /> REPORT <br /> Dual Phase'Pilot Test <br /> S <br /> Soil Vapor & Groundwater Extraction <br /> J . <br /> Valentine(Castle Motors) <br /> 2315 N.El Dorado Street <br /> Stockton, CA , <br /> Project No. 723.2 ' <br /> November 5, 2004 <br /> J <br /> .1..0 INTRODUCTION <br /> In April 1987 the site's two 3,000-gallon gasoline underground storage tanks (UST) and one <br /> 150-gallon 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 /> Ly; • In October 1993 four boreholes (SB-1 thru SB-4) were placed around the location of <br /> - � the former waste oil tank. Results showed that all soil samples, except for the 36-foot <br /> i sample from SB-2, were below detection limits for BTEX and TPH-G. <br /> V� • <br /> i In September 1994 monitoring well MW-1 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 <br /> 56 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 <br /> site. Results showed the presence of high levels of BTEX and TPH-G in the soil and <br /> groundwater. F <br /> • In June 1996 three additional monitoring wells (MW-4, MW-5 & MW-6) and soil { <br /> boring `B" were installed at the site. Soil sample analytical results indicated the f <br />