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1 •1 .1 ' Ground Water Monitoring Report - Fourth Quarter 2001 Former Curtiss Pontiac-Buick ' 2450 Toste Road, Tracy, California - ' 1.0. INTRODUCTION ' At the request of Mr Jae Toste of J T Storage, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 2450 Taste Road, Tracy, California (the site) The scope of work included monitoring and sampling nine ground water monitoring wells for laboratory analysis,data ' analysis and preparation of this report The site setting is illustrated in Figure 1 A plan view of the site is Illustrated in Figure 2 I Summaries of previous investigations at the site are included in Preliminary Investigation and Evaluation Report (PIER), prepared by AGE, dated 15 August 1997, and in Quarterly Report, prepared by AGE, dated 18 September 1997 Ground water monitoring data collected from ' monitoring well GLMW-3,which is part of the underground storage tank(UST)release investigation at 2420 Grant Line Road, is included in this investigation to delineate the down gradient extent of the dissolved hydrocarbon plume and to determine ground water flow direction and gradient I GLMW-3 had been sampled on 17 September 2001 and was not resampled for this event, although depth to water was remeasured on 24 October 2001 Quarterly monitoring data from February 1998 to the present is summarized in Tables 1 and 2 in this report I� 2.0. PROCEDURES Field work was conducted and this report was prepared in accordance with guidelines issued by the I Central Valley Regional Water Quality Control Board (CVRWQCB) for subsurface investigation of underground storage tank (UST) sites and guidelines issued by the San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD)for sampling ground water monitoring wells I2 1 WELL MONITORING AND EVACUATION On 24 October 2001, a Solinst water level meter was used to measure the depth to ground water in each well relative to the tops of the well casings After ground water depth measurements were collected,monitoring wells MW-1 through MW-7 were purged using a disposable plastic bailer A minimum of three casing-water volumes of water were purged from each well,excluding monitoring Iwell MW-7 The actual purge volumes were as follows • Three to four gallons of water were evacuated from wells MW-113, MW-2B, and MW-3 through MW-6 • Ten and eleven gallons of water were purged from MW-IA and MW-2A, respectively IAdvanced GeoEnvironmental Inc