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I <br /> 1.0 INTRODUCTION <br /> • GHH Engineering, Inc (GHH) is currently providing USA Gasoline Corporation(USA) <br /> professional environmental services to conduct groundwater monitoring at their retail gasoline <br /> station#110,located at 2132 East Mariposa Road, Stockton, California,as shown on Figures 1, 2 <br /> and 3 Mr Chuck Miller of USA authorized GHH to prepare this Third Quarter 2002 <br /> Groundwater Monitoring Report(QMR)for the site This report has been prepared for submittal <br /> to the San Joaquin County, Environmental Health Division(County),the lead regulatory agency <br /> overseeing environmental issues at the site The County Site Code is#1669 <br /> 1.1 Scope of Work <br /> Groundwater monitoring was conducted at the site on July 29, 2002 The following is a beef <br /> summary of the scope of work authorized by USA <br /> • Locate and measure depths to groundwater in wells MW-1P through MW-6P,MW-1 <br /> and MW-2 <br /> • Purge a minimum of three equivalent well volumes of groundwater from each of the <br /> wells and monitor pH,temperature and conductivity <br /> • Collect groundwater samples from the monitoring wells <br /> . • Analyze water samples for total petroleum hydrocarbons in the gasoline range(TPH <br /> G),benzene,toluene, ethylbenzene, and xylenes (BTEC, 1,2-dichloroethane (1,2- <br /> DCA), and the oxygenated fuel additives methyl-tertiary-butyl-ether(MTBE), di- <br /> isopropyl ether(RIPE), ethyl tertiary butyl ether (ETBE),tertiary amyl methyl ether <br /> (TAME), and tertiary butyl alcohol(TBA)using EPA Methods 8015 Modified, 8020 <br /> and 8260B,respectively <br /> • Prepare this QMR for submittal to USA and the appropriate regulatory agencies. <br /> 2.0 GROUNDWATER MONITORING <br /> The following section discusses field protocol used during data collection for this QMR <br /> 2.1 Groundwater Elevations <br /> Prior to gauging depths to groundwater,the eight groundwater monitoring wells were checked <br /> for the presence of free floating hydrocarbon compounds using an interface probe No free <br /> product was present in any of the wells Depths to groundwater measurements were then taken <br /> from each well from surveyed marks on the casing using an electric water level sensor <br /> Calculated groundwater elevations are summarized in Table 1, and shown on Figure 4 <br /> • <br /> i <br />