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Quarterly Report - First Quarter 2003 <br /> YAMADA BROTHERS <br />' 15405 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 /> 1 GeoEnvironmentai, 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 /> 1 <br /> 2.0. PROCEDURES <br />' Quarterly groundwater monitoring was performed on 22 March 2003 The fieldwork was performed <br /> in accordance with the Central Valley Regional Water Quality Control Board(CVRWQCB)and San <br />' Joaquin County Environmental Health Department (EHD) guidelines for investigations of <br /> underground storage tank (UST) sites and sampling ground water monitoring wells, 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 Ol 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 /> ' Advanced GeoEnviraamental,Inc <br /> 1 <br />