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r <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone (209)838-9888 RECE8YED Faesuntle (209) 838-9883 <br /> SEP 13 2002 <br /> September 12, 2002 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr Michael Inf lima <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , 3rd Fl <br /> Stockton, CA 95202 <br /> Subject Groundwater Monitoring Well Installation Report <br /> Woolsey Oil, Inc - Cardlock Facility <br /> 1501 W Charter, Stockton, California (Site Code 508175) <br /> Dear Mr Infuma <br /> Ground Zero Analysis, Inc (Ground Zero) is submitting this report to summarize the installation of <br /> two groundwater monitoring wells and analytical results of soil and groundwater sampling at the <br /> subject site The work was conducted at the request of the San Joaquin County Public Health <br /> Services, Environmental Health Department (EHD) to further evaluate the nature and extent of <br /> groundwater impact on the property <br /> SITE BACKGROUND <br /> The location of the facility is shown on Figure 1 The site is an operating automated refueling facility with <br /> existing underground storage tanks (USTs) Prior to the installation of the current tanks, the business had <br /> utilized two 4,000-gallon UST's containing diesel fuel and one 4,000-gallon UST containing unleaded <br /> gasoline <br /> On October 9, 1998, Wallace Kuhl & Associates supervised the drilling and sampling of two soil borings <br /> at the site Elevated levels of petroleum hydrocarbons were detected in the soil samples collected near the <br /> UST's and the dispenser island Subsequently, the UST's along with product dispensers and associated <br /> piping were removed Analytical results of the soil samples collected from beneath the UST's and the <br /> former dispenser island indicated petroleum hydrocarbon contamination <br /> On April 19 and April 20, 1999, Ground Zero advanced eight soil borings at the site to investigate the <br /> lateral and vertical extent of residual soil contamination, as well as the potential impact to groundwater <br /> �1 The data obtained from this investigation defined the lateral and vertical extent of soil contamination <br /> Source removal excavation was proposed in the Corrective Action Workplan dated June 2, 1999 <br /> G TaWGROUNDMWOOLSEY CH nReportslWELLRPT_MW4_MW5 doe <br />