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Quarterly Report - Third Quarter 2000 I Former CHASE CHEVROLET (Van Buren) Facihty 424 North Van Buren Street, Stockton, California ' 1.0. INTRODUCTION ' At the request ofMr Jeffery Setness,attorney for the property owners,Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report summarizing field activities performed during the third quarter of 2000 at 424 North Van Buren Street,Stockton, California(Figure 1 -Location Map) The ' scope of work performed on the site during the quarter included monitoring concentrations of dissolved petroleum hydrocarbons in ground water on the site, operation and monitoring of the soil vapor extraction (SVE) and in-situ air sparging (LAS) 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 s1?mn rimmed in Corrective Action Plan -December 1996 and in Quarterly Report-May 1999, both prepared by AGE ' 2.0. PROCEDURES Field activities were performed in accordance with guidelines established by the Regional Water '. Quality Control Board - Central Valley Region (RWQCB-CVR) and by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) for the investigation of underground storage tank(UST)sites Field procedures for the monitoring ofthe remediation system ' and performance of ground water monitoring and sampling are described below 2 1 MONITORING WELL PURGE PROCEDURES On 21 and 22 August 2000, a Solinst water level meter was used to measure the depth to ground ' water in nine monitoring wells and five vapor extraction wells at the site and in fifteen monitoring wells at the Madison site relative to the tops of the well casings 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 I Rdvanced GeoEnvironmental,Inc I