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l t Quarterly Report - Third Quarter 2001 Former CHASE CHEVROLET (Van Buren) Facility 424 North Van Buren Street, Stockton, California I1.0. INTRODUCTION At the request of Mr Jeffery B Setness, Esq , attorney for the former owners of the property at the address above, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report sumnianzing field activities performed during the third quarter of 2001 at 424 North Van Buren I Street(the site), Stockton, California(Figure 1) The scope ofwork performed on the site during the quarter included performance of a 24-hour aquifer pumping test, conducting a quarterly ground water monitoring event and preparation of this report Procedures and results of the agwfer pumping test will be presented in a report currently in preparation Structures and monitoring well locations on the site and adjacent area are illustrated in Figure 2 Background information was summarized in Corrective Action Plan-December 1996, dated 27 December 1996 and in Quarterly Report-May 1999, dated 30 July 1999, both prepared by AGE I2.0. PROCEDURES Field activities were performed in accordance with guidelines established by the Regional Water IQuality Control Board - Central Valley Region (RWQCB) and by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD) for the investigation of underground storage tank(UST) sites and sampling of ground water monitoring wells Field procedures for the performance of ground water monitoring and sampling are described below ' 2 1 WELL MONITORING AND EVACUATION ' On 16 August 2001, a Solinst water level meter was used to measure the depth to ground water in twelve monitoring wells at the site and m fourteen monitoring wells at the Madison site relative to the tops of the well casings Depth to water was not measured in the five vapor extraction wells as vehicles stored at the site blocked access to the wells The ground water elevations (Table 1) and hydraulic gradient (Figure 3) were detemuned from these data After measurement of depths to water, casing water in each monitoring well was evacuated(purged) using a two-stage submersible purge pump The pump was decontairunated prior to purging each well using an Alconox solution and clean tap water Temperature,pH and conductivity of the purged water were measured at regular intervals during purging using an Oakton and an ICM water analyzers Approximately 5 to 14 gallons of water were removed from each well except for MW-9, from which 52 gallons of water were purged(approximately three casmg-water volumes) Allpurged Iwater was stored in 55-gallon DOT-approved drums on-site Field data and field logs are included in Appendix A Advanced GeoEavi ronmenlal,Inc I