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1.0 INTRODUCTION GHH Engineering, Inc (GHH) is currently providing USA Gasoline Corporation (USA) professional environmental services to conduct groundwater monitoring at their retail gasoline station 9110 located at 2132 East Manposa Road, Stockton, California, as shown on Figures 1, 2 I and 3 Mr Snkanth Dasappa of USA authorized GHH to prepare this "Second Quarter, 1999, Groundwater Monitoring Report"(QMR) for the site This report has been prepared for submittal to the San Joaquin County Public Health Services, Environmental Health Division (County), the lead regulatory agency overseeing environmental issues at the site The County Site Code is #1669 1.1 Scope of Work Groundwater monitoring was conducted at the site on April 30, 1999 The following is a brief summary of the scope of work authorized by USA • Locate and measure depths to groundwater in wells MW-1-P through MW-6-P, MW-1, and MW-2 • Purge a minimum of three equivalent well volumes of groundwater from each of the wells and monitor pH and conductivity • Collect groundwater samples from the monitoring wells Analyze water samples for total petroleum hydrocarbon in the gasoline range (TPH G, EPA Method 8015 modified),benzene, toluene, ethylbenzene and total xylenes (BTEX, EPA Method 8020) • Prepare this QMR for submittal to USA and the County 20 GROUNDWATER MONITORING ' The following section discusses field protocol used during data collection for this QMR 2.1 Groundwater Elevations Prior to gauging depths to groundwater, seven groundwater monitoring wells (MW-1, MW-2, MW-1-P through MW-6-P) were checked for the presence of free floating hydrocarbon compounds using an interface probe No free product was present in any of the wells Depths to groundwater measurements were then taken from each well from surveyed marks on the casing ' using an electric water level sensor Calculated groundwater elevations are summarized in Table 1, and shown on Figure 4