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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 "Second 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 /> 1 #1669 <br /> 1.1 Scope of Work <br />' <br /> Groundwater monitoring was conducted at the site on April 6, 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 /> - Collect groundwater samples from the monitoring wells. <br /> - Analyze water samples for total petroleum hydrocarbons in the gasoline G TPH range , <br /> ( ) <br /> benzene, toluene, ethylbenzene, and xylenes(BTEX), 1,2-Dichloroethane (1,2-DCA), and <br />' oxygenated fuel additives including methyl-tett-butyl-ether (MTBE), di-isopropyl ether <br /> (RIPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether(TAME), tertiary <br /> butyl alcohol(TBA), and ethanol using EPA Methods 8015 Modified, 8020 and 8260B, <br /> 1 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 m Table 1, and shown on Figure 4 <br />