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1 ! • <br /> 1 <br /> • qe0togicat rechn cs Ina <br /> 1 10 1 71h Street <br /> Modesto, California 95354 <br /> 1 (209)522-4119/Fax#522-4227 <br /> Additional Site Characterization Work Plan <br /> Monitoring Well Installation <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado Street <br /> Stockton, CA <br /> Project No 723 2 <br /> June 27, 2002 <br /> 1 <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 Vicinity 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 worked performed at the site to date <br /> • 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- <br /> foot sample from SB-2, were below detection limits for BTEX and TPH-G <br /> • 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 <br /> of 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 <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 <br />