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I I • Quarterly Report - First Quarter 2000 ' FORMER CHASE CHEVROLET (VAN BUREN) FACILITY 424 North Van Buren Street, Stockton, California ' 10. INTRODUCTION ' At the request of Mr Jeffery Setness of Jeff B Setness Professional Law Corp , Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report summarizing field activities ' performed during the first quarter of 2000 at 424 North Van Buren Street, Stockton, California (Figure 1 -Location Map) The scope of work included quarterly ground water monitoring, obtaining laboratory analyses of the samples, 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 - Vicinity Map and Figure 3 - Remediation System Background information was summarized in Corrective Action Plan - ' December 1996 and in Quarterly Report -May 1999, both prepared ay AGE ' 20 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 of the remediation system and performance of ground water monitoring and sampling are described below 2 1 MONITORING WELL PURGE PROCEDURES ' On 07 February 2000, a Solinst water Ievel meter was used to measure the depth to ground water in nine momtoring wells and three vapor extraction wells at the site and fifteen monitoring wells at the Madison site relative to the tops of the well casings The ground water elevations and hydraulic gradient were determined from these data (Table 1) After measurement of depths to water, each monitoring well at the site was purged using a two-stage I 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 Dissolved oxygen was measured in the final purge water using a YSI model 55 dissolved oxygen meter Approximately ten to fourteen gallons of water were removed from each well except MW-9, from which sixty gallons of water were purged (approximately three well volumes) All purged water was stored in 55-gallon DOT-approved drums on-site Field data and field logs are included in Appendix A • IAdiancedCeoEmiron mental Inc