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Quarterly Report - First Quarter 2002 • Former CHASE CHEVROLET (Van Buren) Facility 424 North Van Buren Street, Stockton, California 1.0. INTRODUCTION At the request of the City of Stockton, owner of the property at 424 North Van Buren, Stockton, ICalifornia,Advanced GeoEnvironmental,Inc (AGE)has prepared this quarterly report documenting field activities performed during the first quarter of 2002 at 424 North Van Buren Street (the site), Stockton, California(Figure 1) The scope of work performed on the site during the quarter included conducting a quarterly ground water monitoring event and preparation of this report Structures and monitoring well locations on the site and in the adjacent area are illustrated in Figure 2 Background information was summarized in Corrective Action Plan-December 1996,dated 27 December 1996 and in Quarterly Report - May 1999, dated 30 July 1999, both prepared by AGE Quarterly monitoring data is included in the tables of this report 2.0. BACKGROUND In 1986, one 1,000-gallon underground storage tank (UST), UST No 7, was removed by Falcon Energy Associates(FEA)from an excavation north of the small building Hydrocarbon-impacted soil • was encountered beneath the UST during removal Due to the presence of high concentrations of hydrocarbons and the shallow depth to ground water, further assessment was required ' Between 1990 and 1994, four ground water monitoring wells (MW-3, MW-6, MW-7 and MW-9) and three soil borings (SB3, SB4 and SB5) were drilled and installed on the site to delineate the extent of hydrocarbon-impacted soil and ground water in the vicinity of the former UST ' Hydrocarbon-impacted soil and ground water were encountered in each boring The findings were presented in a March 1991 Progress Report and in the August 1994 Summary Report/Additional Site ' Investigation prepared by Resna Industries On 17 and 18 July 1995, sixteen soil probe bonngs were advanced on and around the site Soil ' samples were collected from five probe bonngs and water samples were collected from eleven probe borings, delineating the extent of the impacted soil and ground water Details and results of the probing investigation were summarized in the Quarterly Report-June 1995,dated 25 August 1995, ' prepared by AGE From September to November 1995, five additional monitoring wells (MW-10, MW-14, MW-15, ' MW-16 and MW-17)were installed on and near the site Petroleum hydrocarbons were not detected in any of the soil samples analyzed Procedures and findings were summarized in the Quarterly Report-December 1995, dated 29 January 1996, prepared by AGE In April 1999, 11 horizontal vapor recovery wells, 5 vertical vapor extraction wells and 23 air isparging wells were installed at the site A thermal/catalytic oxidizer soil vapor extraction(SVE)unit ' Advanced GeoEnvironmental,Inc 1