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! Quarterly Report - February 1998 FORMER CHASE CHEVROLET (VAN BUREN) FACILITY ! 424 North Van Buren Street, Stockton, California ! 1.0 INTRODUCTION In accordance with a request from Mr Jeffery Setness of Hartmann & Setness, Advanced ! GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report summarizing field activities performed during the first quarter of 1998 at 424 North Van Buien Street, Stockton, California ! (Figure I -Location Map) The scope of work included niomtoring ground water, collecting ground water samples, obtaining laboratory analyses of the samples and preparation of this report Structuies and monitoring well locations on the site and adjacent area are illustrated in Figure 2 - Vicinity Map ! Field activities were performed in accordance with guidelines established by the Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) and the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) for investigation of underground storage tank (UST) sites Background information was surnmar rzed in the Cor 1 ective Action Plan - Decembei 1996 prepared by AGE • 20 PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 04 February 1998, a Solinst water level meter was used to measure the depth to ground water in each well 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 MVV-9 The relatne ground water elevations and hydraulic gradient were determined from these data (Table 1) On 05 February 1998, each monitoring well 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 a Hydac water analyzer Approximately ten to twelve gallons of water (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 Stabilization data and field logs are included in Appendix A 22 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each well using new, disposable bailers and upon retrieval, were transferred into 40-rnl EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acrd as a . preservative The samples were labeled and transported under chain-of-custody, in a chilled Ari tuned GeoEm iron mental,Inc I