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1 <br /> the building to the former dispenser, was properly abandoned on April 17, <br /> 1998 <br /> On April 16, 1998, two 1-inch diameter direct push probeholes were driven <br /> beneath the former UST to collect soil and groundwater samples for <br /> ' laboratory analysis Analytical results, summarized in the June 2, 1998 <br /> Preliminary Subsurface Site Investigation Results and Product Piping <br /> Abandonment Completion report, indicated potential benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) impact to subsurface soil and <br /> groundwater The soil and groundwater samples dial not contain detectable <br /> ' oxygenate compounds <br /> In July 1999, Ground Zero Analysis, Inc (GZA) of Escalon, California, <br /> ' performed a subsequent subsurface investigation GZA drilled three soil <br /> borings, completed them as groundwater monitoring wells (MW-1, MW-2, <br /> and MW-3), and collected soil and groundwater samples for laboratory <br /> ' analysis GZA's investigation, summarized in their July 28, 1999 <br /> Groundwater Monitoring Well Installation Report, detected BTEX and total <br /> petroleum hydrocarbon as gasoline (TPH-G) impact in soil and groundwater <br /> samples collected at the MW-2 location Samples collected from MW-1 and <br /> MW-3, placed in hydraulically upgradient positions relative to the former <br /> UST, did not contain detectable petroleum hydrocarbons <br /> The San Joaquin County Environmental Health Department (SJCEHD) <br /> required quarterly groundwater monitoring be performed to assess evolving <br /> ' conditions, which included the oxygenate analytes tert-butanol (TBA), <br /> methyl-tert-butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl-tert-butyl <br /> ether(ETBE), and tert-amylmethyl ether (TAME) After several quarterly <br /> ' events, the laboratory analytical data indicated that higher petroleum <br /> concentrations were measured in samples collected at MW-2 and non- <br /> detectable or lower concentrations were measured at the upgradient locations <br /> ' SJCEHD requested that additional investigation be performed to assess the <br /> extent of petroleum impact PSC submitted a September 24, 2001 Subsurface <br /> ' Site Investigation Workplan to SJCEHD, which proposed further assessment <br /> SJCEHD approved this work plan in a letter dated October 16, 2001 <br /> PSC performed an investigation in March 2002 Six probeholes (PH-3 <br /> through PH-8) were driven, one groundwater monitoring well (MW-4) was <br /> installed, one air sparging well (SP-1) was constructed, one soil vapor <br /> extraction well (VW-1) was constructed, and soil and groundwater samples <br /> were collected for laboratory analysis Investigation findings were submitted <br /> 5 <br /> April 2004 <br /> j Quarterly Groundwater Monitoring Report <br /> Earthgrams Baking Companies,Inc <br /> {Former Kilpatrick's Bakeries,Inc) <br /> 1717 South Center Street <br /> Stockton,CaliforniaPrepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp <br /> H 1ENV\62400172U 21362EG\ProjectsNStockton Center Stllnvestigatrve and Quanerly ReporOQuartaly Repon 04_2004 doc January 18,2005 <br />