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I , Ground Water Monitoring Report - Third Quarter 2001 I Former Curtiss Pontiac-Buick __P 2 D P;l 2450 Toste Road, Tracy, California I1.0. INTRODUCTION At the request of Mr Joe Toste, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 2450 Toste 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 ISummanes 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 momtonng 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 GLMW-3 had been sampled on 22 June 2001 and was not resampled for this event, although depth to water was remeasured on 27 July 2001 Quarterly monitoring data from February 1998 to the present is summarized in Tables 1 and 2 in this report 2.0. PROCEDURES Field work was conducted and this report was prepared in accordance with guidelines established I by the Central Valley Regional Water Quality Control Board (CVRWQCB) for subsurface investigation of underground storage tank (UST) sites and guidelines established by San Joaquin County Public Health Services -Environmental Health Division (PHS-EHD) for sampling ground water monitoring wells I2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING On 27 July 2001, a Solmst 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, monitonng 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 well IMW-7 The actual purge volumes were as follows I • Four gallons of water were evacuated from wells MW-1B, MW-2B, and MW-3 through MW-6 • 10 5 and 11 5 gallons of water were purged from MW-1A and MW-2A, respectively I Advanced GueEnvironmental Inc