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1 <br /> 1.0 INTRODUCTION <br /> GHH Engineering, Inc. (GRIT) 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. Srikanth Dasappa of USA authorized GHH to prepare this First Quarter, 2001, <br /> 1 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 January 11, 2001. The following is a brief <br /> summary of the scope of work authorized by USA: <br />' 0 Locate and measure depths to groundwater in wells MW-1-P through MW-6-P, MW-1, <br /> P <br /> and MW-2. <br /> ' Pure a minimum of three equivalent well volumes of groundwater from each of the wells <br /> • g q <br /> 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 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 (RIPE), <br /> ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), and tertiary butyl <br /> alcohol(TBA) using EPA Methods 8015 Modified, 8020 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 /> 1 <br /> 1 <br />