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I <br /> 1 <br /> Quarterly Report - Second Quarter 2001 <br /> Former Curtiss Pontiac-Buick <br /> 2350 Toste Road, Tracy, California <br /> 1 0 INTRODUCTION <br /> At the request of Mr Joe Toste, Advanced GeoEnviron rental, Inc (AGE) has prepared this <br /> quarterly report for 2450 Toste Road, Tracy, California (the site) The scope of work included <br /> monitoring and sampling nine ground water monitoring wells for laboratory analysis, data analysis <br /> I and preparation of this report The site setting is illustrated in Figure 1 A plan view of the site is <br /> illustrated in Figure 2 <br /> A summary of previous investigations at the site is included in Preliminary Investigation and <br /> 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 /> GLMW-3,which is part of the underground storage tank (UST) release investigation at 2420 Grant <br /> Line Road, 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 GLMW-3 had been <br />' sampled on 23 March 2001 and was not resampled for this event, although depth to water was <br /> remeasured on 25 April 2001 Quarterly monitoring data from February 1998 to the present is <br /> Isummarized in Tables I and 2 in this report <br /> I2.0 PROCEDURES <br /> Field procedures were performed in accordance with Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental Health <br /> Division (PHS-EHD) guidelines for subsurface investigations of underground storage tank (UST) <br /> sites and sampling ground water monitoring wells <br /> 2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING <br /> On 25 April 2001, a Solinst water level meter was used to measure the depth to ground water in each <br /> well relative to the tops of the well casings After ground water depth measurements were collected, <br /> Imonitoring wells MW-1 through MW-7 were purged using a disposable plastic bailer A minimum <br /> of three casing-water volumes of water were purged from each well, excluding monitoring well <br /> MW-7 The actual purge volumes were as follows <br /> I * Fourallons of water were evacuated from wells MW-1B MW-2B and d MW-3 through <br /> MW-6 <br /> • 10 5 and 11 5 gallons of water were purged from MW-1A and MW-2A, respectively <br /> • Monitoring well MW-7 was pumped dry after six gallons of water had been purged <br /> Advanced GeoEnvironmental Inc <br />