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Y • Quarterly Report - First Quarter 2002 " CHEROKEE TRUCK STOP 3535 East Cherokee Road, Stockton, California a ' ' 1.0 INTRODUCTION ; At, the request of Mr Ellis-Cecchini of Cecchini, Cecchini and Giovannoni,' Advanced° T ' GeoEnvironmental, Inc (AGE) has prepared this report for field work performed at 3535 East Cherokee Road, Stockton, California, during the first quarter of 2002 The scope of work included ' conducting a quarterly ground water monitoring event and preparation of this report The site setting is illustrated in Figure 1 Structures, monitoring well and soil boring locations are ' illustrated in Figures 2 and 3 Background information was summarized in the Problem Assessment Report,'dated 16 August 2001, prepared by AGE y > 2.0. PROCEDURES Six ground water monitoring wells and two domestic wells were purged and sampled on 11 February 2002 Field work was performed in accordance with the Central Valley Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Environmental Health Department (EHD) �. guidelines for the investigations ofunderground storage tank(UST)sites and sampling ground water monitoring wells I r 41 2 1 WELL MONITORING AND EVACUATION 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 each well and ground water flow direction for the site were determined from the data collected (Table 1) , ,f I ' After measuring ground water depths, monitoring wells UST-1 through UST-4 and UST-6 were, purged using a 2-inch Grundfos submersible purge pump Monitoring well UST-5 was purged using a new disposable plastic bailer Approximately 82 gallons of water were purged from UST-1 and I approximately 7 to 12 gallons of water were removed from wells UST-2 through UST-6(a minimum of three casing-water volumes per well) Ground water 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 of purged 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 • On 11 February 2002, the small and large domestic wells on-site were sampled for volatile organic compounds To purge the large domestic well, a drain valve was opened on the water storage tank ' Advanced GeoEnvironmental,Inc r