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I Quarterly Report - November- 1997 • FORMER CHASE CHEVROLET (VAN BURT-N) FAC111I Y 424 North Van Buten Street, Stockton, California f 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 fourth quarter of 1997 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 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 summarized in the Corrective Action Plan - December 1996 prepared by AGE I lie2.0. PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 04 November 1997, 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 MW-9 The relative ground water elevations and hydraulic gradient were determined from these data(Table 1) IOn 05 November 1997, 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 Iintervals during purging using an ICM model 52200 water analyzer Approximately eight to twelve gallons of water (minimum of three well volumes)were removed from each well Fifty gallons of ' water were purged from MW-9 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 I Water samples were collected from each well using new, disposable bailers and, upon retrieval,were transferred into 40-aril EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a preservative The samples were labeled and transported under chain-of-custody, in a chilled Advanced GeoEnviron=nental,Inc