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Ile Quarterly Report - Fourth Quarter 2000 YAMADA BROTHERS 15406 South Tracy Boulevard, Stockton, California 1.0. INTRODUCTION ' In accordance with the request of Mr Bob Yamada of Yamada Brothers, Inc , Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for the property located at 15406 South Tracy Boulevard, Stockton, California The scope of work included quarterly ground water monitoring and preparation of this report The location of the site and the immediately surrounding area are illustrated on Figure 1, structures and monitoring well locations on the site are illustrated on Figure 2 Background information is summarized m the Preliminary Site Assessment Report February 1999, prepared by AGE I 2.0. PROCEDURES Quarterly groundwater monitoring was performed on 11 December 2000 Fieldwork was performed in accordance with the Central Valley Regional Water Quality Control Board(CVRWQCB) and San Joaquin County Public Health Services -Environmental Health Division(PHS-EHD) guidelines for the investigation of underground storage tank (UST) sites and sampling ground water monitoring . wells I 2 1 MONITORING WELL PURGE PROCEDURES IOn 11 December 2000, a Solinst water level meter was used to measure the depth to ground water in the three wells relative to the tops of the well casings (well heads) The ground water elevations Iand gradient were determined from this data (Table 1) After recording water level measurements, a two-stage submersible pump was used to purge each monitoring well of standing water Approximately 7 to 9 gallons of water were removed from each well(approximately 3 casing water volumes) Ground water temperature, pH and conductivity were measured at regular intervals during the purge process using a Hydac water analyzer Field data sheets are included in Appendix A Purged water was stored on site in labeled, 55-gallon DOT- approved drums I 22 COLLECTION AND LABORATORY ANALYSIS OF GROUND WATER SAMPLES ' Following purging and allowing a minimum of 80% recovery of initial water volume in the wells, water samples were collected from each purged well using new disposable plastic bailers Each water I sample was transferred into laboratory-supplied 40-m1 VOA vials containing 05 ml 18% hydrochloric acid as a sample preservative, and into 1-liter glass amber bottles without a preservative After collection, the samples were properly labeled, placed in a chilled container and Advanced GeoEnvuonmental,inc I