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Quarterly Report - August 1997 FORMER CHASE CHEVROLET (MADISON) FACILITY ' 423 North Madison Street, Stockton, California 10. 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 third quarter of 1997 at 423 North Madison Street, Stockton, California The ' scope of work included monitoring concentrations of dissolved petroleum hydrocarbons in ground water on the site and preparation of this report The location of the site is illustrated in Figure 1 - Location Map Structures and monitoring well locations are illustrated in Figure 2 - Site Plan ' Field activities %Here performed in accordance with guidelines for investigation of underground storage tank (UST) sites established by the Central Valley Regiona],Water Quality Control Board 1 (CVRWQCB) and the San Joaquin County Public Health Services -Environmental Health Division (PHS-EHD) Background information was summarized in the Revised Cori ective Action Plan - Februai y 1997 and previous Quarterly Reports prepared by AGE 2 0. PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 05 August 1997, a Solinst water level meter was used to measure the depth to ground water in each"ell relative to the tops of the well casings The relative groundwater,elevations and hydraulic gradient were determined from these data(Table 1) Following measurement of ground water depths, each monitor ing well was purged using a two-stage _ pui ge pump The purge pump was decontaminated prior to purging each well by pumping an Alconox solution followed by pumping tap w ater Approximately ten gallons of water were removed from each well except MW-8, from which approximately fifty gallons of water were removed Tempeiature pH and conductivity of purged water were measured at regular intervals during purging using an ICM model 52200 water analyzer All purged water was stored in 55-gallon DOT-approved diums 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 Samples were transferred ' Into 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acrd as a preservative and into 1-liter amber bottles without preservative The samples were transported in a chilled container, under chain-of-custody, to McCampbell Analytical, Inc (MAT) in Pacheco, California ' ridvaneed CeoEmironmental,Inc