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t <br />' Quarterly Report - First Quarter 2001 <br /> . YAMADA BROTHERS <br /> 15406 South Tracy Boulevard, Stockton, California <br /> 1 <br /> Z.O. 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 The scope of work included quarterly ground water <br /> monitoring and pi eparation 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 the Preliminary Site Assessment Report - <br /> February 1999, prepared by AGE <br /> 1 <br /> 2.0. PROCEDURES <br />' Quarterly ground water monitoring was performed on 20 March 2001 Field work was performed <br /> in accordance with the Central Valley Regional Water Quality Control Board(CVRWQCB) and San <br /> I Joaquin County Public Health Services -Environmental Health Division(PHS-EHD) guidelines for <br /> the investigation of underground storage tank (UST) sites and sampling ground water monitoring <br /> lie wells <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> On 20 March 2001, a S olinst water level meter was used to measure the depth to groundwater in the <br /> three wells relative to the tops of the well casings (well heads) The ground water elevations and <br /> Igradient were determined from this data(Table 1) <br />' After recording water level measurements, a two-stage submersible pump was used to purge each <br /> monitoring well of standing water Approximately 7 5 to 10 gallons of water were removed from <br /> each well(approximately 3 casing-water volumes) Ground water temperature,pH and conductivity <br /> were measured at regular intervals during the purge process using a Hydac 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 /> IDomestic 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 /> I 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 /> I <br /> • <br /> I <br /> Advanced GeoRavironmentai,Inc <br /> I , <br />