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[1 <br /> 1.0 INTRODUCTION <br /> • 650 Management Corporation (Client) has retained Park Environmental Corporation (Park) to <br /> perform quarterly groundwater monitoring at 151 South Main Street in Manteca, California A <br /> Site Location Map and Site Plan, showing the location of the various wells, are shown on Figures <br /> 1 and 2 The work performed and described in this report has been mandated by the lead agency, <br /> the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), and <br /> was performed in accordance with the workplan dated May 24, 1994 and supplemented January <br /> 1 13, 1995, which was approved by PHS/EHD <br /> ' 1.1 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 /> • Purge a minimum of three well volumes of groundwater from each of the wells <br /> (BEI-MW-1, BEI-MW-2, BEI-MW3, SRK-MW1, SRK-MW2, and SRK-MW3) <br /> until pH, temperature and electrical conductivity values were within 10 percent, <br /> • Collect groundwater samples from all existing wells, <br /> • Field filter samples for lead analysis, <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 /> ' a Prepare this Quarterly Groundwater Monitoring Report for presentation to the <br /> PHS\EHD <br /> ' The PHS/EHD was notified that the sampling p g date was September 22, 1995 Ms Margaret <br /> Lagono from PHS/EHD was present to observe the sampling <br /> ' 2.0 GROUNDWATER MONITORING WELL SAMPLING METHODOLOGY <br /> 2.1 Groundwater Elevations <br /> ' Prior to obtaining depth to groundwater measurements, the wells were checked for the presence <br /> of free product using a new disposable bailer for each well Depth to groundwater measurements <br /> 1 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 1 <br /> 1 <br />