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.. .. .. .. . ..... .. ... Quarterly Report - First Quarter 2003 ENTERPRISE INVESTMENTS (Former J.B. Murphy Trucking) 355 Enterprise Place, Tracy, California 1.0. INTRODUCTION At the request of Mr. Monty Warren of Enterprise Investments,Advanced GeoEnvironrnental,Inc. (AGE) has prepared this quarterly report for 355 Enterprise Place, Tracy, California. The site and the surrounding area are illustrated on Figure 1. Structures,boring and well locations are illustrated =i on Figure 2. Site background information is provided in Appendix A 2.0. PROCEDURES Five ground water monitoring wells (MWI through MW5) and one ground water extraction well (EW1) were monitored and sampled on 21 March 2003. 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 PURGING 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). j 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 6 gallons of water(a minimum of 3 casing water- volumes per well)were removed from MWl,MW3,MW4 and MW5, approximately 13 gallons of water were removed from MW2 and approximately 60 gallons of water were removed from EW1. 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. it - 2.2. COLLECTION OF GROUND WATER SAMPLES Water samples were collected from purged wells MWl, 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 m118%hydrochloric acid as a sample preservative and into one 1-liter amber bottle without sample preservative. After I Advanced CeoE+nvironmental,Inc.