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1.0 INTRODUCTION <br /> • USA Gasoline Corporation rp (USA)has retained GHH Engineering, Inc (GHH), formerly The <br /> Park Corporation (Park), to assist them in the environmental assessment at their gasoline station <br /> #110, located at 2132 East Manposa Road, Stockton, California, as shown on Figures 1, 2 and 3 <br />' Mr Snkanth Dasappa of USA authorized GHH to prepare this"Third Quarter, 1997, <br /> Groundwater Monitoring Report" (QMR) for the site This report has been prepared for <br /> submittal to the San Joaquin County Public Health Services, Environmental Health Division <br /> (County), the lead regulatory agency overseeing environmental issues at the site The County Site <br /> Code is #1669 <br /> 1.1 Scope of Work <br /> Groundwater monitoring was conducted at the site on July 30, 1997 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, S- <br /> 1, MW-1, and MW-2 <br /> • Purge a minimum of three equivalent well volumes of groundwater from each of <br /> the wells and monitor pH, temperature and conductivity <br /> • Collect groundwater samples from the monitoring wells <br /> • Analyze water samples for total petroleum hydrocarbon in the gasoline range <br /> (TPH G, EPA Method 8015 modified), benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX, EPA Method 8020) <br /> • Prepare this QMR for submittal to USA and the County <br />' 2.0 GROUNDWATER MONITORING <br /> The following section discusses field protocol used during data collection for this QMR <br /> r <br /> 2.1 Groundwater Elevations <br /> Prior to gauging depths to groundwater, nine groundwater monitoring wells (MW-1, MW-2, S-1, <br /> and MW-1-P through MW-6-P)were checked for the presence of free floating hydrocarbon using <br /> an interface probe, S-1 was dry 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 Field data sheets are included in Appendix A <br />