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i <br /> Quarterly Report - Third Quarter 2002 <br /> YAMADA BROTHERS <br /> I15406 South Tracy Boulevard, Stockton, California <br /> I1.0. INTRODUCTION <br /> In accordance with the request of Mr Bob Yamada of Yamada Brothers, Inc , Advanced <br /> IGeoEnvironmental, Inc (AGE)has prepared this quarterly report for the property located at 15406 <br /> South Tracy Boulevard, Stockton, California The scope of work Included quarterly ground water <br /> monitoring and preparation of this report The location of the site and the Immediately surrounding <br /> area are Illustrated on Figure 1, structures and monitoring well locations on the site are Illustrated <br /> on Figure 2 Background Information is summarized in Preliminary Site Assessment Report, dated <br /> 12 February 1999, and in Additional Site Assessment Report, dated 12 December 2001, both <br /> prepared by AGE <br /> 2.0. PROCEDURES <br /> I Quarterly ground water monitoring was performed on 27 September 2002 Field work was <br /> performed in accordance with the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) and San Joaquin County Environmental Health Department (EHD) guidelines for <br />� . investigations of underground storage tank(UST)sites and sampling ground water monitoring wells, <br /> respectively <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 27 September 2002, a Solinst water level meter was used to measure the depth to ground water <br /> in the three wells relative to the tops of the well casings (well heads) The ground water elevations <br /> Iand gradient were determined from this data (Table 1) <br /> After recording water level measurements, disposable plastic bailers were used to purge the <br /> I monitoring wells of standing water Approximately ten gallons of water were removed from each <br /> well(approximately 3 casing-water volumes) Groundwater temperature,pH and conductivity were <br /> measured at regular intervals during the purge process using an Oakton water analyzer Field data <br /> sheets are included in Appendix A Purged water was stored on site in labeled, 55-gallon DOT- <br /> approved drums <br /> Domestic well DW-1 was not sampled this quarter <br /> Advanced GeoEnvironmental,Inc <br />