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Quarterly Report - Fourth Quarter 2001 <br /> ' FORMER CHASE CHEVROLET (MADISON) FACILITY <br /> 423 North Madison Street, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> ' At the request of the City of Stockton,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report summarizing field activities performed during the fourth quarter of 2001 at 423 <br /> North Madison Street, Stockton,California The scope ofwork performed on the site for the quarter <br /> t included monitoring concentrations of dissolved petroleum hydrocarbons in groundwater on the site, <br /> waste disposal and preparation of this report The site setting is illustrated in Figure 1 Structures and <br /> monitoring well locations are illustrated in Figure 2 <br /> Site background information was summarized in Revised Corrective Action Plan -February 1997, <br /> Site Investigation Report- UST No 8, dated 10 February 1998 and Quarterly Report-August 1998, <br /> tprepared by AGE Data from previous ground water monitoring events is included in the tables of <br /> this report <br /> 1 <br /> 2.0., BACKGROUND <br /> ' Four underground storage tanks (USTs, Tanks No 3, 4, 5 and 6) were removed by Falcon Energy <br /> Associates (FEA) in 1986 from a common excavation north of the repair shop In November 1992, <br /> ' three additional USTs, Tanks No 1, 2 and 8, were removed by FEA from separate excavations <br /> located west, east and south of the repair shop, respectively All three tanks were reported to be in <br /> poor condition and hydrocarbon-impacted soil was encountered m each excavation Due to the <br /> presence of hydrocarbons and the shallow depth to ground water, further assessment investigation <br /> was required by the San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS-EHD) The former UST locations are illustrated on Figure 2 <br /> From 1990 to 1994,five ground water monitoring wells(MW-1, MW-2, MW-4, MW-5 and MW-8) <br /> and two soil borings (SB-1 and SB-2) were installed near the former location of USTs Nos 3, 4, 5 <br /> ' and 6 Hydrocarbons were encountered in both soil and ground water samples collected near the <br /> former USTs location Details were presented in a March 1991 Progress Report and August 1994 <br /> Summary Report/Additional Site Investigation prepared by Resna Industries <br /> tBetween 16 June and 17 July 1995, seventeen soil borings (GP 1 through GP 17) were advanced at <br /> the site as part of site assessment activities pour probings (GP 1 to GP4) were advanced near the <br /> ' former location of UST No 8, a 1,000-gallon trichloroethane (TCA) solvent tank Petroleum <br /> hydrocarbons were not detected in soil samples collected from these probirigs However, strong <br /> ' solvent-like odor was noted during sample collection, extending to the bottom of probings GP 1 and <br /> GP2 <br /> • <br /> 1 <br /> Advanced GeoEnvironwenW,Inc <br /> 1 <br />