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i t CLOSURE REPORT JANUARY 1994 Babka Distributing 1149 West Weber Avenue Stockton, California 1.0 INTRODUCTION At the request of the Bank of Stockton, owner of the property located at 1149 West Weber Street in Stockton, California, Geological Audit Services, Inc (GeoAudit) has prepared this summary of environmental investigations of the referenced property These investigations have been performed in accordance with the Tn-Regional Board ' Guidelines for investigation of underground storage tank sites, and have received regulatory oversight from San Joaquin County Public Health Service, Environmental ' Health Division (PHS/EHD). In correspondence dated December 21, 1993, PHS/EHD notified the Bank of Stockton that "If the September 1993 (groundwater) results are non-detect, an additional sampling event will be necessary to confirm that groundwater is no longer contaminated " In addition, the PHS/EHD directive requested a minimum of two additional borings to investigate the extent of residual soil contamination In accordance with this directive, ' personnel from GeoAudit performed groundwater monitoring procedures on January 3, 1994 and installed four additional borings on January 21, 1994 1 ! 2.0 BACKGROUND 2.1 Site Location ' The site is located in a flat industrial area in the Port of Stockton and is occupied by the World Wildlife Museum for storage (Figure 1) Prior to 1989, it was occupied by a beer distributor, Babka Distributing Company There is a large warehouse, a small metal ' storage unit, a large asphalt-paved parking area, and a rail spur on the property (Figure 2) ' 2.2 Site History One 10,000-gallon gasoline tank and one 3,000-gallon diesel tank were installed at the site in 1972 The tanks were used to fuel delivery trucks Both underground storage tanks were removed from the site by Jim Thorpe Oil Company in April 1991 Diesel and 1 1