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Y ' Quarterly Report - August 1995 • FORMER CHASE CHEVROLET (VAN BUREN) FACILITY ' 424 North Van Buren Street, Stockton, California ' I.O. INTRODUCTION At the request of Mr Jeffery Setness of Hartmann & Setness,Advanced GeoEnvironmental, Inc ' (AGE) has prepared this Quarterly Report summarizing field activities performed during the third quarter of 1998 at 424 North Van Buren Street, Stockton,California (Figure I -Location Map) The ' scope of work included monitoring ground water, collecting ground water samples, obtaining laboratory analyses of the samples and preparation of this report Structures and monitoring well locations on the site and adjacent area are illustrated in Figure 2 - Vicinity Map ' FieId activities were performed in accordance with guidelines established by the Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) and by the San Joaquin County ' Public Health Services - Environmental Health Division (PHS-EHD) for the investigation of underground storage tank(UST) sites Background information was summarized in the Corrective Action Plan - December 1996 and subsequent quarterly reports prepared by AGE 1 2.0. PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES ' On 12 August 1998, a Solinst water level meter was used to measure the depth to ground water in nine monitoring wells at the site and fifteen monitoring wells at the Madison site relative to the tops ' of the well casings An Ullage interface probe was used to check for the presence of free product in MW-3 and MW-9 The ground water elevations and hydraulic gradient were determined from these data(Table 1) The casing elevation of MW-13 at the Madison site was resurveyed relative to a City ' of Stockton bench mark All casing elevations at both sites were then recalculated to reflect elevations relative to mean sea level ' On 13 August 1998, each monitoring well at the site was purged using a two-stage submersible' purge pump The pump was decontaminated prior to purging each well using an Alconox solution and clean tap water Temperature, pH and conductivity of purged water were measured at regular ' intervals during purging using an ICM model 52200 water analyzer Approximately ten to fifteen gallons of water(a minimum of three well volumes) were removed from each well except MW-9, ' from which sixty gallons of water were purged All purged water was stored in 55-gallon DOT- approved drums on-site Field data and field logs are included in Appendix A 1 1 Advanced GeoEnveronmental,Inc 1 1