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the building to the former dispenser, was properly abandoned on April 17, 1998 On April 16, 1998, two 1-inch diameter direct-push probeholes were driven beneath the former UST to collect soil and groundwater samples for ' laboratory analysis Analytical results, summarized in the June 2, 1998 Preliminary Subsurface Site Investigation Results and Product Piping Abandonment Completion report, indicated potential benzene, toluene, ' ethylbenzene, and xylenes (BTEX) impact to subsurface soil and groundwater The soil and groundwater samples did not contain detectable oxygenate compounds In July 1999, Ground Zero Analysis, Inc (GZA) of Escalon, California, performed a subsequent subsurface investigation GZA drilled three soil borings, completed them as groundwater-monitoring wells (MW-1, MW-2, and MW-3), and collected soil and groundwater samples for laboratory analysis GZA's investigation, summarized in their July 28, 1999 ' Groundwater Monitoring Well Installation Report, detected BTEX and total petroleum hydrocarbon as gasoline (TPH-G) impact in soil and groundwater samples collected at the MW-2 location Samples collected from MW-1 and ' MW-3, placed in hydraulically upgradient positions relative to the former UST, did not contain detectable petroleum hydrocarbons The San Joaquin County Environmental Health Department (SJCEHD) required quarterly groundwater monitoring be performed to assess evolving conditions, which included the oxygenate analytes tert-butanol (TBA), ' methyl-tert-butyl ether (MTBE), di-isopropyl ether(DIPS), ethyl-tert-butyl ether (ETBE), and tert-amylmethyl ether (TAME) After several t uarterly events, the laboratory analytical data indicated that higher petroleum concentrations were measured in samples collected at MW-2 and non- detectable or lower concentrations were measured at the upgradient locations SJCEHD requested that additional investigation be performed to assess the extent of petroleum impact PSC submitted a September 24, 2001 Subsurface Site Investigation Workplan to SJCEHD, which proposed further assessment SJCEHD approved this work plan in a letter dated October 16, 2001 PSC performed an investigation in March 2002 Six probeholes (PH-3 through PH-8) were driven, one groundwater-monitoring well (MW-4)was installed, one air sparging well (SP-1) was constructed, one soil vapor extraction well (VW-1) was constructed, and soil and groundwater samples ' were collected for laboratory analysis Investigation findings were submitted r 5 August 2004 Quarterly Groundwater Monitoring Report Earthgrams Baking Companies,Inc (Former Kilpatrick s BakerleS,Inc} 1717 South Center Street Stockton,California Prepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp H\F-NV1624001721121382EG1ProjectslStocktonLenter SAlnvesngative and QuarterlyReportslQuarterry Report 10_2004 doc January 18,2005