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uarteffy Report - Second' QuaTter 2003 STRONG PROPERTY - ' 5157 West Business Loop 205, Tracy,;California _ 1:0: INTRODUCTION — At the request of Messrs.-Robert-arid Mike Strong,Advanced GeoEnvironmental,"Inc. (AGE) has ' port for the property located at 5157 West Business Loop L05, .Tracy, Prepared this.quarterly re California. The scope of work included ground water sampling of monitoring wells MW l through MW9 and preparation of this report. The site'and the surrounding area'are illustrated in Figure 1. I ,Structures and monitoring well locations are illustrated on Figures 2 and 3. Quarterly monitoring data from July 1998 to the present is suininarized in Tables 1-and 2 of this report. - - 2:0.. PROCEDURES'' 'Nine monitoring wells were purged and sampled on 17.June 2003. All field work procedures and reporting requirements'are in accordance with guidelines issued by the Central Valley Regional ' Water Quality Control Board (CVRWQCB) for subsurface investigations of underground storage tank (UST);sites and guidelines issued by San Joaquin County Environmental Health Department (EHD) for sampling of ground water monitoring wells: 2.1. WELL MONITORING AND PURGING On 1.7 June 2003, monitoring wells MW 1 'through MW9 were purged and.sampled. Due.'to construction not onitored olrsampl d ..A Solinst water le 11 MW 10'could not be located and'subsequently was ' vel meter.was used.to measure'the depth to ground " water to the nearest 0.01-foot in.the eight monitoring wells relative'to the tops of the well casings. The ground,water elevations and gradient were determined from these data (Table 1): '. After recording v'vaier level measurements, new disposable plastic bailers were used to purge each I monitoring well of 'standing water. Between 6.25 ;and 9.25 gallons of water (a minimum of 3'casing-water volumes per well).were removed from each well. Groundwater temperature,pH.and conductivity were measured,at regular intervals during purging using an Oakton water analyzer. Field sheets and data are included in Appendix A. Purged water was stored on-site in labeled, :55-gallon DPT-approved drums. Advanced GeoEnvirodmental,-Inc.