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i • Quarterly Report - Third Quarter 2002 STRONG PROPERTY 5157 West Business Loop 205, Tracy, California 1.0. INTRODUCTION ' At the request of Messrs. Robert and Mike Strong,Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for the property located at 5157 West Business Loop 205, Tracy, California. The scope of work included ground water monitoring and sampling of monitoring wells MW 1 through MW6 and preparation of this report. The site and the surrounding area are illustrated in Figure 1. Structures and monitoring well locations are illustrated on Figures 2 and 3. Background information for the site is summarized in the AGE-prepared document titled Additional Site Assessment Work Plan Addendum, dated 01 July 1999. Quarterly monitoring data from July 1998 to the present is summarized in Tables 1 and 2 of this report. 2.0. PROCEDURES Sampling of ground water monitoring wells MW 1 through MW6 occurred on 25 September 2002. • All field work procedures and reporting requirements are in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for subsurface investigations of underground storage tank(UST)sites and guidelines issued by San Joaquin County Environmental Health Department (EHD) for sampling of ground water monitoring wells. 2.1. WELL MONITORING AND EVACUATION A Solinst water level meter was used to measure the depth to ground water to the nearest 0.01-foot in the six monitoring 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, new disposable plastic bailers were used to purge each monitoring well of standing water. Between six and nine gallons of water (a minimum of 3 casing-water volumes per well)were removed from each well. Ground water temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer. Field sheets and data are included in Appendix A. Purged water was stored on-site in labeled, 55-gallon Department of Transportation (DOT)-approved drums. Advanced GeoEnvironmental,Inc.