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1.0 INTRODUCTION <br /> 650 Management Corporation (Client) has retained The Park Corporation (Park) to perform <br /> quarterly groundwater monitoring at 151 South Main Street, Manteca, California The location <br /> of the site and the various wells locations, are shown on Figures 1 and 2 (Site Location Map and <br /> Site Plan) The work performed and described in this report has been mandated by the lead <br /> agency, the San Joaquin County Public Health Services, Environmental Health Division (County), <br /> and was performed m accordance with the workplan dated May 24, 1994 and supplemented <br /> ' January 13, 1995, which was approved by the County <br /> I <br /> 1.1 Scope of Work <br /> Specific tasks completed by Park during the groundwater momtonng program included the <br /> following <br /> • Locate and measure depths to groundwater in all the wells, <br /> ' Purge a minimum of three well volumes of groundwater from each of the wells <br /> (BEI-MW1, BEI-MW2, BEI-MW3, SRK-MW1, SRK-MW2, SRK-MW3, MW-7, <br /> ' and MW-8) until pH, temperature and electrical conductivity values were within <br /> 10 percent, <br /> rj Collect groundwater samples from all existing wells, <br /> Analyze water samples for total petroleum hydrocarbons as gasoline (TPH G), <br /> methyl-tert-butyl-ether (MTBE) and benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX), using EPA Methods 8015 Modified and 602, respectively, and <br /> t Prepare this "Quarterly Groundwater Monitoring Report" (QMR) for presentation <br /> to the County <br /> ' The County was notified that the sampling date was September 24, 1996 Ms Margaret Lagorio <br /> from the County was present to observe the sampling <br /> 2.4 GROUNDWATER MONITORING WELL SAMPLING METHODOLOGY <br /> ' 2.1 Groundwater Elevations <br /> ' Prior to obtaining depths to groundwater measurements. the wells were checked for the presence <br /> of free product using an interface probe Depths to groundwater measurements were made using <br /> an electric water level indicator The depths were measured from the top of the surveyed well <br /> ' casings Groundwater level data collected to date from the site are presented in Table 1, and a <br /> copy of the field notes are included in Appendix A <br /> ' 1 <br />