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Quarterly Report - Second Quarter 2002 Former Fisco Warehouse (Howard Lenz Property) I1648 Shaw Road, Stockton, California I1.0. INTRODUCTION At the request of Mr.Peter Lenz of Innovative Beverage Brokers,Advanced GeoEnvironmental,Inc. (AGE) has prepared this quarterly report for the property located at 1648 Shaw Road, Stockton, California. The site and the surrounding area are illustrated in Figure 1. Structures,boring and well locations are illustrated on Figure 2. Background information is summarized in the AGE-prepared Preliminary Site Investigation Report, dated 30 December 1997. 2.0. PROCEDURES ' Field work was performed in accordance with guidelines issued by San Joaquin County Environmental Health Department (EHD) for the sampling of ground water monitoring wells and Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for investigation of underground storage tank (UST) sites. • 2.1. WELL MONITORING AND EVACUATION Ground water sampling of monitoring wells MW 1 through MW7 was conducted on 31 May 2002. A Solinst water level meter was used to measure the depth to ground water in the seven wells relative to the tops of the well casings. The ground water elevations and gradient were determined from these data (Table 1). After recording water level measurements disposable plastic bailers were used to purge wells MW4 through MW7 of standing water. There was an insufficient amount of ground water in wells MW 1, MW2 and MW3; subsequently these wells were not purged or sampled. Approximately 3 to 4 gallons of water (a minimum of 3 casing-water volumes) were purged from MW4 through MW7. Ground water temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer.Purged water was stored on-site in labeled, I55-gallon DOT-approved drums. Field sheets and data are included in Appendix A. 2.2. COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers. Each water sample was transferred into three 40-m1 VOA vials containing 0.5 ml 18%hydrochloric acid • as a sample preservative and into one 1-liter amber bottle without added preservative. After collection, the samples were properly labeled, placed in a chilled container and transported under Advanced GcoEnvironmental,Inc. I