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r <br /> r1.0 INTRODUCTION <br /> • <br /> rGHH 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 Mariposa Road, Stockton, California, as shown on Figures 1, 2 <br /> and 3 Mr Srnkanth Dasappa of USA authorized GHH to prepare this "Third and Fourth <br /> Quarter, 1999, Groundwater Monitoring Report" (QMR) for the site This report has been <br />' prepared for subrnrttal to the San Joaquin County Public Health Services, Environmental Health <br /> Division(County), the lead regulatory agency overseeing environmental issues at the site The <br /> County Site Code is #1669 <br /> 1.1 Scope of Work <br /> Groundwater monitoring was conducted at the site on July 7, 1999 and October 21, 1999 The <br /> following is a brief 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 /> MCollect groundwater samples from the monitoring wells <br /> • Analyze water samples for total petroleum hydrocarbon in the gasoline range (TPH G, <br /> r EPA Method 80j iduumm=ftna toluene, ethylbenzene, total xylenes, and MTBE <br /> (BTEX andS-- <br /> EPA Method 8020) <br /> Prepare this r su mi t e regulatory agencies <br /> 2.0 GROUNDWATER MONITORING <br /> rThe following section discusses field protocol used during data collection for this QMR <br /> r2.1 Groundwater Elevations <br /> Prior to gauging depths to groundwater, the eight groundwater monitoring wells (MW-1, MW-2, <br /> MW-1-P through MW-6-P) were checked for the presence of free floating hydrocarbon <br /> compounds using an interface probe No free product was present in any of the wells Depths to <br /> ' groundwater measurements were then taken from each well from surveyed marks on the casing <br /> using an electric water level sensor Calculated groundwater elevations are summarized in Table <br /> 1, and shown on Figure 4 and 5 <br /> i <br /> r <br />�r <br />