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r <br /> H <br /> r <br /> r� Quarterly Report - Second Quarter 2000 <br /> r Former Curtiss Pontiac-Black <br /> 2450 Toste Road, Tracy, California <br /> r1.0. INTRODUCTION <br /> r At the request of Mr Joe Taste, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Quarterly Report for 2450 Toste Road,Tracy, California (the site) The scope of work included the <br /> sampling of ten ground water monitoring wells The site setting is illustrated in Figure 1 A plan <br /> rview of the site is illustrated in Figure 2 <br /> A summary of previous investigations at the site is included in the Preliminary Investigation and <br /> r Evaluation Report(PIER),prepared by AGE, dated 15 August 1997 and Quarterly Report, prepared <br /> by AGE, dated 18 September 1997 Ground water monitoring data collected from monitoring well <br /> MW-3,which is part of the underground storage tank(UST)release investigation at 2420 Grant Line <br /> rRoad, is included in this investigation to delineate the down gradient extent of the dissolved <br /> hydrocarbon plume and to determine ground water flow direction and gradient Quarterly monitoring <br /> data from February 1998 to the present is summarized in Tables 1 and 2 in this report <br /> IThis report is prepared in accordance with Central Valley Regional Water QualityControl Board and <br /> I• San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) <br /> guidelines <br /> 2.0. PROCEDURES <br /> I2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING <br /> On 17 July 2000, a Solinst water level meter was used to measure the depth to ground water in each <br /> I well relative to the top of the well casing After ground water depth measurements were collected, <br /> monitoring wells MW-1 through MW-7 were purged using a two-stage submersible pump A <br /> minimum of three well volumes of water were purged from each well, excluding monitoring well <br /> rMW-7 The actual purge volumes are as follows <br /> • Five to six gallons of water were evacuated from wells MW-1B, MW-2B, and MW-3 <br /> Ithrough MW-6 <br /> • Twelve gallons of water were purged from MW-IA and MW-2A <br /> r • Monitoring well MW-7 was pumped dry after three gallons of water had been purged <br /> ITemperature, pH and conductivity were measured at one or two-gallon intervals in wells MW-IA, <br /> . MW-IB, MW-2B, and MW-3 through MW-7, and at three-gallon intervals in well MW-2A The <br />' Advanced GeoEnvironmental Inc <br /> r <br />