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t <br /> 1 <br /> 1.0 INTRODUCTION <br /> P GHH Engineering, Inc. (GH <br /> H) is currently providing USA Gasoline Corporation (USA) <br /> professional environmental services to conduct groundwater monitoring at their retail gasoline ' <br /> station#110 Iocated at 2132 East Mariposa Road, Stockton, California, as shown on Figures 1, ? <br /> and 3. Mr. Srikanth Dasappa of USA authorized GHH to prepare this Fourth Quarter, 2000. <br /> Groundwater Monitoring Report(QMR) for the site. This report has been prepared for submittal ' <br /> to the San Joaquin County Public Health Services, Environmental Health Division(County), the <br /> lead regulatory agency overseeing environmental issues at the site. The County Site Code is <br /> #1669. ' <br /> 1.1 Scope of Work <br /> Groundwater monitoring was conducted at the site on O t <br /> ctober 31, 2000. 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-1-P through MW-6-P, MW-1, <br /> and MW-2. <br /> Purge a minimum of three equivalent well volumes of groundwater from each of the wells <br /> and monitor pH, temperature and conductivity. <br /> 1 <br /> • Collect groundwater samples from the monitoring wells. <br /> • Analyze water samples for total petroleum hydrocarbons in the gasoline range (TPH G), <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX); 1,2-dichloroethane (1,2-DCA); and <br /> the oxygenated fuel additives methyl-tert-butyl-ether (MTBE), di-isopropyl ether (DIPE), ' <br /> ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), and tertiary butyl <br /> alcohol (TBA) using EPA Methods 8015 Modified, 8020 and 826013, respectively. <br /> Prepare this QMR for submittal to USA and the , <br /> ' 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 welts. 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 /> t <br />