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All . Quarterly Report - First Quarter 2004 CHEROKEE TRUCK STOP 3535 East Cherokee Road, Stockton, California 1.0. INTRODUCTION At the request of Mr Ellis Cecchini of Cecchim, Cecchini and Giovannom, Advanced GeoEnvironmental, Inc (AGE) has prepared this report for field work performed at 3535 East Cherokee Road, Stockton, California, during the first quarter of 2004 The scope of work included conducting a quarterly ground water monitoring event and preparation of this report The site setting is illustrated in Figure i Structures, monitoring wells and soil boring locations are illustrated in Figure 2 Background information was summarized In the AGE-prepared Problem Assessment Report, dated 16 August 2001 At the request ofthe San Joaquin County Environmental Health Department(EHD),Cherokee Truck Stop quarterly ground water monitoring events are coordinated to occur concurrently with ground water monitoring activities at the adjacent Moore Truck Lines property(3400 Newton Road) 2.0. PROCEDURES On 12 March 2004, six ground water monitoring wells and the large on-site domestic well were purged and sampled Field work was performed in accordance with the Central Valley Regional Water Quality Control Board (CVRWQCB) and EHD guidelines for the investigations of underground storage tank (UST) sites and sampling ground water monitoring wells, respectively 2 1 WELL MONITORING AND EVACUATION On 12 March 2004, a Solinst water level meter was used to measure the depth to ground water relative to the tops of the well casings in six monitoring wells in the area of the former UST locations The ground water elevation in wells UST-2 through UST-6 and ground water flow direction for the site were determined from the data collected (Table 1) After measuring ground water depths, monitoring wells UST-2 through UST-7 were purged using a Waterra inertial pump Between 6 and 14 gallons of water were removed from wells UST-2 through UST-7(a minimum of three casing-water volumes per well) Groundwater was purged from near the top of the water column to remove water trapped within the unscreened interval of the well casings Temperature,pH and conductivity ofpurged water were measured at regular intervals during purging using an Oakton water analyzer The recorded field data and logs are included in Appendix A Purged water was stored on-site in 55-gallon DOT-approved drums pending laboratory . analysis Advanced GeoEnviron mental,Inc