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1.0 INTRODUCTION <br /> GHH Engineering, Inc (GHH) is currently providing USA Gasoline Corporation(USA) <br /> 1 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 Srnkanth Dasappa of USA authorized GHH to prepare this "Third 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 July 11, 2000 The following is a brief <br /> summary of the scope of work authorized by USA <br /> • Locate and measure groundwaterto de the m wells MW- throeMW-6-P, MW-1, <br /> P � <br /> and MW-2 <br /> • <br /> Purge a minimum of three equivalent well v num groundwater gvolumes of gro d iter 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 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 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 />