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Quarterly Report - Fourth Quarter 2002 ENTERPRISE INVESTMENTS (Former J.B. Murphy Trucking) 355 Enterprise Place, Tracy, California o� 1.0. INTRODUCTION � bx At there nest of Mr. Monty Warren of -- Ente Investments,Advanced GeoEnvironmental,Inc. (AGE) has prepared this quarterlyreport f 355 Enterprise Place, Tracy, California. The site and the surrounding area are illustrated on Figure 1. Structures,boring and well locations are illustrated on Figure 2. Site Background Information is provided in Appendix A ' 2.0. PROCEDURES Five ground water monitoring wells (MW1 through MW5) and one ground water extraction well '(EW1) were monitored and sampled on 19 November 2002. Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tanks (UST) sites. 2.1. WELL MONITORING AND EVACUATION A Solinst water level meter was used to measure the depth to ground water in the 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 MW 1, MW3, MW4 and MW5 of standing water and a Watera Hydrolift pump was used to purge wells MW2 and EW 1 of standing water. Approximately 5.5 gallons of water (a minimum of 3 casing water-volumes per well) were removed from MWI, MW3,'MW4 and MW5, approximately 13 j gallons of water were removed from MW2 and approximately 56 gallons of water were removed from EW L Ground water temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer.Purged ground water was containerized in properly labeled DOT-approved model 17H 55-gallon drums and was stored on-site.Field sheets and data are included in Appendix B. 2.2. COLLECTION OF GROUND WATER SAMPLES Water samples were collected from purged wells MW 1, MW3, MW4 and MW5 using new disposable plastic bailers while samples from wells MW2 and EW 1 were collected with a hose bailer after allowing all wells to achieve a minimum 80%recovery of the pre-purge water volume. 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 sample preservative. After Advanced GeoEnvironmental,Inc.