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' 1.0 INTRODUCTION <br /> GHH Engineering, Inc (GBH) is currently providing USA Gasoline Corporation(USA) <br /> professional environmental services to conduct groundwater monitoring at their retail gasoline <br /> station#I 10, 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"First Quarter, 1998, <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 o Loring was conducted at the site on January 22, 1998 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-1, <br />' MW-1, and MW-2 <br /> • Purge a minimum of three equivalent well volumes of groundwater from each of the wells <br /> tand monitor pH, temperature and conductivity <br /> Collect groundwater samples from the monitoring wells <br />' • 0 Analyze water samples for total petroleum hydrocarbon in theran e asohne H G <br /> g g � , <br /> EPA Method 8015 modified), benzene, toluene, ethylbenzene and total xylenes (BTEX, <br />' EPA Method 8020) <br /> Prepare this QMR for submittal to USA and the County <br /> 1 <br /> 2.4 GROUNDWATER MONITORING <br />' The following section discusses field protocol used duringdata collection for this <br /> QMR- <br /> 2.1 <br /> MR2.1 Groundwater Elevations <br /> Prior to gauging depths to groundwater, seven groundwater morutoring wells (MW-1, MW-2, <br /> MW-1-P through MW-4-P and MW-6-P)were checked for the presence of free floating <br /> hydrocarbon 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 MW-1, MW-5-P and S-1 were damaged during station <br /> retrofit activities MW-1 and MW-5-P were repaired and re-surveyed on January 30, 1998 <br />' These wells will be sampled m the second quarter of 1998 Calculated groundwater elevations are <br /> • summarized in Table 1, and shown on Figure 4 <br /> 1 <br /> 1 <br />