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1.0 INTRODUCTION USA Gasoline Corporation (USA) has retained The Park Corporation (Park) to assist them in the environmental assessment and remediation at USA's gasoline retail station#110, located at 2132 East Mariposa Road in Stockton, California, as shown on Figures 1, 2 and 3 Mr Snkanth ' Dasappa of USA authorized Park to prepare this quarterly groundwater monitoring report (QMR) for the site This report has been prepared for submission to the San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD), the lead regulatory agency overseeing environmental issues at the site The PHS/EHD Site Code is #1669 1.1 Scope of Work ' Groundwater monitoring was completed at the site on October 30, 1996 The following is a brief summary of the scope of work authorized by USA ' a Locate and measure �'depths to groundwater in wells MW- through MW-6-P P g and MW-1, ' 0 Purge a minimum of three equivalent well volumes of groundwater from each of the wells and monitor pH, temperature and conductivity, • Collect groundwater samples from the monitoring wells, • Analyze water samples for total petroleum hydrocarbon in the gasoline and diesel range (TPH G and TPH D, EPA Method 8015 modified), benzene, toluene, ' ethylbenzene, and total xylenes (BTEX; EPA Method 8020),xotal lead (EPA Method 239 2), and methyl-tert-butyl-ether (MTBE, EPA Method 8020), and ' Prepare this QMR for submittal to USA and the PHS/EHD 2.0 GROUNDWATER MONITORING The following section discusses field protocol used during data collection for this QMR ' 2.1 Groundwater Elevations Upon gauging depths to groundwater, seven groundwater monitoring wells (MW-1 and MW-1-P through MW-6-P) were checked for the presence of free floating hydrocarbon using an interface probe, MW-1 was dry S-1 and MW-2 were not checked for groundwater or free product 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 presented in Table 1 and shown on Figure 4 Feld data sheets are included in Appendix A 1