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I <br /> QUARTERLY REPORT <br /> November 1996 <br /> Former CHASE CHEVROLET (Van Buren) Facility <br /> 424 North Van Buren Street <br />' Stockton, California <br /> 10. INTRODUCTION <br /> In accordance with a request from Mr Jeffery Setness of Hartmann & Setness, Advanced <br />' GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report summarizing field activities <br /> performed during the forth quarter of 1996 at 424 North Van Buren Street, Stockton, California <br /> (Figure 1 -Location Map) Structures and monitoring well locations on the site and adjacent area <br />' are illustrated in Figure 2 - Vicinity Map <br /> Field activities were performed in accordance with guidelines for investigation of underground <br /> storage tank (UST) sites established by both the Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) and the San Joaquin County Public Health Services - Environmental Health <br /> Division (PHS-EHD) Background information was summarized in the February 1996 Quarterly <br /> Report prepared by AGE <br /> 2.0 PROCEDURES <br /> I21 MONITORING WELL PURGE PROCEDURES <br /> On 05 November 1996, a Solinst water level meter was used to measure the depth to ground water <br /> in each well relative to the tops of the well casings An Ullage interface probe was used to check for <br /> the presence of free product in MW-3 and MW-9 The relative ground water elevations and hydraulic <br /> gradient were determined from these data (Table 1) <br /> IOn 06 November 1996, each monitoring well was purged using a 2-stage submersible purge pump <br /> The pump was decontaminated prior to purging each well using an Alconox solution and clean tap <br />' water Temperature, pH and conductivity were measured at regular intervals during purging using <br /> a Hydac water analyzer Eight to twelve gallons of water (minimum of three well volumes) were <br /> removed from each well Fifty gallons of water was purged from MW-9 All purged water was stored <br /> in 55-gallon DOT drums on-site Stabilization data and field logs are included in Appendix A <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each well using new disposable bailers and transferred into 40- <br /> ml EPA vials containing 0 5 ml of 18% hydrochloric acid as a preservative The samples were <br /> transported under chain-of-custody in a chilled container to McCampbell Analytical, Inc , in <br />