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1 • Quarterly Report Third Quarter 2000 FORMER CHASE CHEVROLET (MADISON) FACILITY ' 423 North Madison Street, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Jeffery Setness of Jeff B Setness Professional Law Cole ,' Advanced ' GeoEnvironmental, Inc (AGE) has prepared this quarterly report summanzing field activities performed during the third quarter of 2000 at 423 North Madison Street, Stockton, Cal>_fornla The ' scope of work performed on the site for the quarter included monitoring concentrations of dissolved petroleum hydrocarbons in ground water on the site and preparation of this report The site setting is illustrated in Figure 1 Structures and monitoring well locations are illustrated in Figure 2 1 Site background information was summarized in Revised Corrective Action Plan -February 1997, dated 28 February 1997, Site Investigation Report - UST No 8, dated 10 February 1998 and Quarterly Report-August 1998, prepared by AGE ' 2.0. PROCEDURES • On 21 August 2000,ground water monitoring and sampling was performed at the site on wells MW- 1, MW-2, MW-4, MW-5, MW-8, MW-11, MW-12, MW-13, MW-18, MW-19A, MW 19B, MW- 20A, MW-20B, MW-21A and MW-21B in accordance with the revised monitoring schedule established at a 03 Apnl 1998 meeting with the PHS-EHD MW-12 was included in this monitoring ' event to assess for contaminates detected in soil samples collected in the area during the previous quarter Contaminants Included total petroleum hydrocarbons quantified as gasoline (TPH-g) and ' total petroleum hydrocarbons quantified as diesel (TPH-d) as sumo anzed in Quarterly Report- Second Quarter 2000 prepared by AGE Field activities were performed in accordance with guidelines for Investigation of underground ' storage tank(UST) sites 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) 21 MONITORING WELL PURGE PROCEDURES On 21 August 2000, a Solinst water level meter was used to measure the depth to ground water in ' 15 monitoring wells at the subject site relative to the tops of the well casings The ground water elevations and hydraulic gradient were determined from these data(Table 1) ' On 21 August 2000, monitoring wells MW-1, MW-2, MW-4, MW-12, MW-13, MW-19A, MW- 19B, MW-20A, MW-2013, MW-21A and MW-21B were purged using submersible purge pumps Monitoring was performed in accordance with the revised monitoring schedule established at a 03 Advanced GeoEnvironmental,Inc 1