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1 <br /> . Quarterly Report - Fourth Quarter 2002 <br />' YAMAHA BROTHERS <br /> 15406 South Tracy Boulevard, Stockton, California <br />' 1.0. INTRODUCTION <br />' In accordance with the request of Mr Bob Yamada of Yamada Brothers, Inc , Advanced <br /> Geo Environmental, 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 Appendix A <br /> I <br /> 2.0. PROCEDURES <br />' Quarterly ground water monitoring was performed on 1 I December 2002 The 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 groundwater monitoring wells, <br />' • respectively <br />' 2 1 WELL MONITORING AND EVACUATION <br /> A Solinst water level meter was used to measure the depth to ground water to the nearest 0 01 foot <br />' in the three wells relative to the tops of the well casings (well heads) The ground water elevations <br /> and gradient were determined from this data (Table 1) <br />' After recording water level measurements, disposable plastic bailers were used to purge the <br /> 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 B Purged water was stored on site in labeled, 55-gallon DOT- <br /> approved drums <br />' Domestic well DW-1 was purged by opening the purge valve and allowing the holding tank to be <br /> emptied Following complete discharge of the holding tank the pump was allowed to operate for at <br />' least one minute and a sample was collected from the sampling port located on the supply line <br /> between the well head and the holding tank <br /> 1 <br /> Advanced GeoEnvt ron mental,Inc <br />