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1 <br /> 1 0 INTRODUCTION <br /> ' 650 Management Corporation (Client) has retained Park Environmental Corporation (Park) to <br /> r 1 perform quarterly groundwater monitoring at 151 South Main Street in Manteca, California A <br /> vicinity map and site plan, showing the location of the various wells, are shown on Figures 1 and <br /> 2 in Appendix A The work performed and described in this report has been mandated by the <br /> lead agency, the San Joaquin County Public Health Services, Environmental Health Division <br /> ' (PHS/EHD), and was performed in accordance with the workplan dated May 24, 1994 and <br /> supplemented January 13, 1995, which was approved by PHS/EHD <br /> t1.1 Scope of Work <br /> Specific tasks completed by Park during the groundwater monitoring program included the <br /> ' following <br /> • Locate and measure depth to groundwater in all the wells, <br /> ' 0 Purge a minimum of three well volumes g e o umes of groundwater from each of the wells <br /> (BEI-MW-1—BEI-MW3, SRK-MWI, SRK-MW2, and SRK-MW3) until pH, <br /> rtemperature and electrical conductivity values were within 10 percent, <br /> • Collect groundwater samples from all existing wells, except BEI-MW2, which <br /> could not be purged or sampled due to standing water from heavy rains <br /> • Analyze water samples for total petroleum hydrocarbons as gasoline (TPH G) and <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX), and total lead (TPb) <br /> using EPA methods 8015 Modified, 602 and 200 7, respectively, and <br /> ' 0 Prepare this Quarterly Groundwater Morutoring Report for presentation to the <br /> PHSIEHD <br /> tThe work described in this report was performed at the site on March 14, 1995 Ms Margaret <br /> Lagorno from the PHS/EHD was present to observe the sampling <br /> 1 <br /> 2 0 GROUNDWATER MONITORING WELL SAMPLING METHODOLOGY <br /> 2.1 Groundwater Elevations <br /> ' Prior to obtaining depth to groundwater measurements, the "ells were checked for the presence <br /> of free product using a new disposable bailer for each well Depth to groundwater measurements <br /> were made using a Slope Indicator The depths were measured from the top of the surveyed well <br /> casings Groundwater level data collected from the site to date are presented in Table I, in <br /> Appendix B <br /> 4' <br />