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1 <br /> 1 <br /> Quarterly Report - Fourth Quarter 2001 <br /> Former CHASE CHEVROLET (Van Buren) Facility <br /> 424 North Van Buren Street, Stockton, California <br />' 1.0. INTRODUCTION <br />' At the request of the City of Stockton, owner of the property at the address above, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this quarterly report summarizing field activities <br /> performed during the fourth 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 /> conducting a quarterly ground water monitoring event,waste disposal.and preparation of this report <br /> Structures and monitoring well locations on the site and adjacent area are illustrated in Figure 2 <br /> Background information was summarized in Corrective Action Plan - December 1996, dated 27 <br /> December 1996 and In Quarterly Report- May 1999, dated 30 July 1999, both prepared by AGE <br />' 2.0. BACKGROUND <br />' In 1986, one 1,000-gallon underground storage tank (UST), UST No 7, was removed by Falcon <br /> Energy Associates (FEA) from an excavation north of the small building Hydrocarbon.-impacted soil <br /> was encountered beneath the UST during removal Due to the presence of high concentrations of <br />' hydrocarbons and the shallow depth to ground water, further assessment was required <br /> Between 1990 and 1994, four ground water monitoring wells (MW-3, MW-6, MW-7 and MW-9) <br />' and three soil borings (SB3, SB4 and S135) were drilled and installed on the site to delineate the <br /> extent of hydrocarbon-impacted soil and ground water in the vicinity of the former UST <br /> I Hydrocarbon-impacted soil and ground water were encountered in each boring The findings were <br /> presented in a March 1991 Progress Report and August 1994 Summary Report/Additional Site <br /> Investigation prepared by Resna Industries <br /> IOn 17 and 18 July 1995, sixteen soil probe borings were advanced on and around the site Soil <br /> samples were collected from five probe borings and water samples were collected from eleven probe <br />' borings, delineating the extent of the impacted soil and ground water Details and results of the <br /> probang investigation were summarized in the Quarterly Report-June 1995, dated 25 August 1995, <br /> prepared by AGE <br />' From September to November 1995, five additional monitoring wells (MW-10, MW 14, MW-15 <br /> , <br /> MW-16 and MW-17)were installed on and near the site Petroleum hydrocarbons were not detected <br /> in any of the soil samples analyzed Procedures and findings were summarized in the Quarterly <br /> Report- December 1995, dated 29 January 1996, prepared by AGE <br /> In April 1999, 11 horizontal vapor recovery wells, 5 vertical vapor extraction wells and 23 air <br /> isparging wells were installed at the site A thenna.Ucatalytic oxidizer soil vapor extraction(SVE) unit <br /> and an in-situ air spargang (IAS) unit were subsequently installed north of the car wash canopy <br /> Advanced GeoEnvironmental,Tnc <br /> I <br />