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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 Manposa Road, Stockton, California, as shown on Figures 1, 2 <br /> and 3 Mr Chuck Miller of USA authorized GHH to prepare this Second 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 April 12, 2002 The following is a brief <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(BTEX), 1,2-dichloroethane(1,2- <br /> DCA),and the oxygenated fuel additives methyl-tertiary-butyl-ether(MTBE),di- <br /> isopropyI 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 No <br /> groundwater measurement could be taken in MW-1 due to a problem with the sounder <br /> Calculated groundwater elevations are summarized in Table 1, and shown on Figure 4 <br />