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1 <br /> Quarterly Report - Second Quarter 2001 <br />' Former CHASE CHEVROLET (Van Buren) Facility <br /> 424 North Van Buren Street, Stockton, California <br /> 1 1.0. INTRODUCTION <br />' At the request of Mr Jeffery B Setness, Esq , attorney for the property owners, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this quarterly report summarizmg field activities <br /> performed during the second quarter of 2001 at 424 North Van Buren Street (the site), Stockton, <br />' California (Figure 1) The scope of work performed on the site during the quarter included <br /> development of two ground water extraction wells, monitoring concentrations of dissolved <br /> petroleum hydro carbons in groundwater on the site, performance of an 8-hour aquifer pumping test <br />' and preparation of this report Procedures and results of the aquifer pumping test will be presented <br /> in a forthcornmg report Structures and monitoring well locations on the site and adjacent area are <br /> illustrated in Figure 2 Background information was summarized in Corrective Action Plan - <br />' December 1996, dated 27 December 1996 and in Quarterly Report-May 1999, dated 30 July 1999, <br /> both prepared by AGE <br /> 2.0. PROCEDURES <br />' • Field activities were performed in accordance with guidelines established by the Regional Water <br /> Quality Control Board - Central Valley Region (RWQCB) and by the San Joaquin County Public <br /> Health Services - Environmental Health Division (PHS-EHD) for the investigation of underground <br /> storage tank (UST) sites and sampling of ground water monitoring wells Field procedures for the <br /> groand water extraction wclI development and performance of ground waLcr monitoring and <br /> sampling are described below <br /> I21 GROUND WATER EXTRACTION WELL DEVELOPMENT <br /> On 13 April 2001 ground water extraction wells EW-3 and EW-4 were developed utilizing a <br /> Idisposable plastic bailer and a two-stage submersible pump <br /> Groundwater was purged from each extraction well until ground water was visually sedmient free, <br /> 60 gallons of water was removed from EW-3 and EW-4 The extracted ground water was <br /> containerized in properly labeled DOT-approved model 17H 55-gallon drums and was stored on-site <br /> in an area lacking public access Field sheets and data are included in Appendix A <br /> 2 2 MONITORING WELL PURGE PROCEDURES <br /> • On 21 May 2001, a Solinst water level meter was used to measure the depth to ground water in <br /> twelve monitoring wells at the site and in fifteen monitoring wells at the Madison site relative to the <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />