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I a . Quarterly Report - Fourth Quarter 2000 Fortner CHASE CHEVROLET (Van Buren) Faculty 424 North Van Buren Street, Stockton, California 1.0. INTRODUCTION At the request of Mr Jeffery B Setness, attorney for the property owners, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report summanzing field activities performed during the fourth quarter of 2000 at 424 North Van Buren Street (the site), Stockton, I California(Figure 1 -Location Map) The scope of work performed on the site during the quarter included monitoring concentrations of dissolved petroleum hydrocarbons in groundwater on the site, operation and monitoring of the soil vapor extraction(SVE) and in-situ air sparging (IAS) systems and preparation of this report Structures and monitoring well locations on the site and adjacent area are illustrated in Figure 2 -Site Plan Background information was surnmanzed in Corrective Action Plan-December 1996, dated 27 December 1996 and in Quarterly Report-May 1999, dated 30 July 1999, both prepared by AGE I2.0. PROCEDURES Field activities were performed in accordance with guidelines established by the Regional Water • Quality Control Board - Central Valley Region (RWQCB) and by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) for the investigation of underground storage tank (UST) sites and sampling of ground water monitonng wells Field procedures for the monitoring of the remediation system and performance of ground water monitoring and sampling are described below I 2 1 MONITORING WELL PURGE PROCEDURES On 28 November 2000, a Sohrist water level meter was used to measure the depth to ground water m nine monitoring wells and in fifteen monitoring wells at the Madison site relative to the tops of the well casings Depth to water was not measured in the five vapor extraction well, stored vehicles at the site blocked access to the wells The ground water elevations (Table 1) and hydraulic gradient (Figure 3) were determined from these data After measurement of depths to water, each monitoring well at the site 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 the purged water were measured at regular intervals during purging using a Hydac water analyzer Approximately twelve to fifteen gallons of water were removed from each well except for MW-9, from which forty-five gallons of water were purged (approximately three casing-water volumes) All purged water was . stored in 55-gallon DOT-approved drums on-site Field data and field logs are included in Appendix A + Advanced GeoEnviroamental,Inc I