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r I i I QUARTERLY REPORT November 1996 Former Chase Chevrolet (Madison) Facility 423 North Madison Street Stockton, California I 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 1996 at 423 North Madison Street, Stockton, California The , scope of work was to monitor concentrations of dissolved petroleum hydrocarbons in ground water ' on the site The location of the site Iis illustrated in Figure 1 - Location Map Structures and monitoring well locations are illustrated in Figure 2 - Site Plan 1 Field activities were performed in accordance with guidelines for the investigation of underground storage tank(UST) sites established by the Central Valley Regional Water Quality Control Board , J (CVRWQCB) and the San Joaquin County Public Health Services - Enviroivnental Health Division (PHS-EHD) Background information was summarized in the February 1996 Corrective Action Plan and previous reports prepared by other consultants 2 0. PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES 5 On 05 November 1996, a Sohnst water level meter was used to measure the depth to ground water ' in each well relative to the tops of the well casings The relative ground water elevations and hydraulic gradient were determined from these data (Table 1) " Following measurement of ground water depths, each monitoring well was purged using a 2-stage, purge pump Approximately seven to twelve gallon's of water(a minimum of three well volumes), r were`removed from each well, except MW-8, from which approximately,forty gallons of water were removed Stabilization parameters(temperature and conductivity) were measured at regular intervals using an ICM model 52200 water analyzer Due to equipment malfunction, pH was not measured ' during purging The purge pump was decontaminated prior to purging each well by pumping an Alconox solution followed by pumping tap water All purged water was stored in 55-gallon DOT drums on-site Stabilization data and field logs are included in Appendix A I 22 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable bailers Samples were 1 l 1