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r <br /> r1.0 INTRODUCTION <br /> • GHH Engineering, Inc (GRIT) is currently providing USA Gasoline Corporation (USA) <br /> ' professional engineering services to conduct environmental momtornng 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 Snkanth Dasappa of USA authorized GHH to prepare this"Fourth 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 /> rGroundwater monitoring was conducted at the site on October 31, 1997 The following is a beef <br /> summary of the scope of work authorized by USA <br /> ' 9 Locate an <br /> d 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 theran asoline e <br /> g g <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 /> 1 <br /> 2.0 GROUNDWATER MONITORING <br /> rThe following section discusses field protocol used during data collection for <br /> this QMR <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 and MW-2 were dry No free product was present in any of the wells <br /> Depths to groundwater measurements were then taken from each well from surveyed marks on <br /> the casing using an electric water level sensor Calculated groundwater elevations are <br /> summarized in Table 1, and shown on Figure 4 Field data sheets are included in Appendix A. <br /> r <br /> • <br /> I <br /> r <br /> 5 <br />