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Quarterly Report - May 1997 FORMER CHASE CHEVROLET (MADISON) FACILITY 423 North Madison 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 second 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 The location of the site is illustrated in Figure I -Location Map Structures and monitoring well locations are illustrated in Figure 2 -Site Plan Field activities were performed in accordance with guidelines for investigation of underground storage tank (UST) sites established by the Central Valley Regional Water Quality Control Board (CVRWQCB)and the San Joaquin County Public Health Services-Environmental Health Division (PHS-EHD) Background information was summarized in the Revised Corrective Action Plan - February 1997 and previous Quarterly Reports prepared by AGE . 2.0. PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On Ob May 1997, a Solmst water IeveI 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 two-stage purge pump Approximately ten gallons of water were removed from each well, except MW-8, approximately fifty gallons of water were removed from MW-8 Monitoring parameters (pH, temperature and conductivity)were measured at regular intervals using an ICM model 52200 water analyzer to verify sample representativeness 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 diems on-site Monitoring data and field logs are included in Appendix A 2 2 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable bailers Samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a preservative and into 1-liter amber bottles The samples were transported in a chilled container to McCampbell Analytical, Inc (MAI) in Pacheco, California, and analyzed for total petroleum Advanced GeoEnviron mental,Inc