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i . Quarterly Report - Second Quarter 2404 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 arc illustrated on Figure 1, structures and monitoring well locations on the site are illustrated on Figure 2 Background information is summarized in the Preliminary Site Assessment Report - February 1999, prepared by AGE 2.0. PROCEDURES Quarterly ground water monitoring was performed on 11 April 2000 Field work was performed in accordance with the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD)and Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tank (UST) sites 2 1 MONITORING WELL PURGE PROCEDURES On 11 April 2000, a Solinst water Ievel meter was used to measure the depth to ground water in the three wells relative to the tops of the well casings The ground water elevations and 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 10 to 11 gallons of water were removed from each well (approximately 3 standing casing 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 2 2 COLLECTION AND LABORATORY ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers Each water sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 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 transported under chain-of-custody to McCambell Analytical Laboratories, Inc , and were analyzed Advanced GeoEnvironmental,Inc