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' 1.0 INTRODUCTION <br /> • USA Gasoline Corporation(USA)has retained The Park Corporation(Park)to assist them in the <br /> environmental assessment and remediation at USA's gasoline retail station#110, located at 2132 <br /> East Manposa Road in Stockton, California, as shown on Figures 1 and 2 (Site Location and <br />' Vicinity Maps) Mr Snkanth Dasappa of USA authorized Park to prepare this quarterly <br /> groundwater monitoring report (QMR) for the site This report has been prepared for submission <br /> to the San Joaquin County Public Health Services, Environmental Health Division(PHS/EHD), <br /> the lead regulatory agency overseeing environmental issues at the site The PHS/EHD Site Code <br /> is#1669 <br />' 1.1 Scope of Work <br /> The 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 as <br /> shown on Figure 3, <br /> ' 0 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 /> P g , <br /> • Analyze water samples for total petroleum hydrocarbon in the gasoline and diesel <br /> range (TPH G and TPH D, EPA Method 8015 modified), benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX, EPA Method 8020), total lead (EPA <br /> ' method 239 2), and methyl tertiary butyl ether(MTBE, EPA Method 8020), and <br /> ' Prepare this QMR for submittal to USA and the PHS/EHD <br /> ' 2.0 GROUNDWATER MONITORING <br /> The following section discusses field protocol used during data collection for this QMR <br /> ' 2.1 Groundwater Elevations <br /> ' Upon gauging depths to groundwater, the six groundwater monitoring wells were checked for the <br /> presence of free floating hydrocarbon using an interface probe No free product was present in <br /> any of the wells Depths to groundwater measurements were then taken from each well from <br /> ' surveyed marks on the casing usmg an electric water level sensor Calculated groundwater <br /> elevations are presented in Table 1 Field data sheets are included in Appendix A <br /> 1 <br />