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i <br /> Quarterly Report - Third Quarter 2003 <br /> YAMADA 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 /> GeoEnvironmental, Inc (AGE)has prepared this quarterly report for the property located at 15406 <br /> South Tracy Boulevard, Stockton, California (site) The scope of work included quarterly ground <br /> I water monitoring and preparation of this report The location of the site and the immediately <br /> surrounding area are Illustrated on Figure 1 Structures and monitoring well locations on the site are <br /> illustrated on Figure 2 Background Information is summarized in Appendix A <br /> 20 PROCEDURES <br /> Quarterly ground water monitoring was performed on 11 September 2003 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 ofunderground storage tank(UST)sites and sampling ground water monitoring wells, <br /> respectively <br /> I � <br /> 2 1 WELL MONITORING AND EVACUATION <br />' A Soiinst 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 /> Iand gradient were determined from this data (Table 1) <br /> I After recording water level measurements, disposable plastic bailers were used to purge the <br /> monitoring wells of standing water Approximately nine to ten gallons of water were removed from <br /> each well(approximately 3 casing-water volumes) Ground water temperature,pH and conductivity <br /> I were measured at regular intervals during the purge process using an Oakton water analyzer Field <br /> data 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 /> Advanced GeoEnvironmental,Inc <br />