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INITIAL SITE ASSESSMENT EXECUTIVE SUMMARY The California Department of Transportation (Caltrans) District 10 - Environmental Engineering Branch retained Geocon Consultants, Inc. to perform an Initial Site Assessment (ISA) of the Tracy Maintenance Station. The objective of the ISA was to provide a summary of recognized environmental conditions associated with the former and current facility operations. Caltrans requested the ISA to identify potential onsite and adjace t property environmental impairments that may impact land use planning, the health and safety of nsite personnel, and/or the construction of future onsite improvements. The scope of the ISA included a site reconnaissance, an offsite survey, a review of historical records and environmental documents, asbestos and lead-based paint building surveys,data evaluation and the preparation of this report The Site was developed as a California Department of Tr insportation (Caltrans) maintenance station in 1970 including the office, equipment building, wareh use and Ioading dock, gas house, material storage bins, wash rack and two 7,600-liter (2,000-gallon) fuel underground storage tanks (USTs). A wood storage shed was constructed at the Site in 1999. Facility operations generally include the storage and repair of Caltrans vehicles and equipment used for the maintenance of California highways. In April 1988, one waste oil UST was removed from the Site, and in September 1996, one steel 7,600-liter(2,000-gallon) gasoline UST and one steel 7,600-liter(2,000-gallon)diesel fuel UST were removed from the Site. A 7,600-liter (2,000-gallon) diesel aboveground storage tank (AST) was subsequently installed at the Site. Petroleum hydrocarbons were not detected in soil and groundwater samples collected during the 1996 UST removal activities with the exception of a methyl tert-butyl ether (MTBE) concentration of 31 micrograms per liter (gg/l) reported for a grab groundwater sample. The reported presence of MTBE was based on Environmental Protection Agency (EPA)Test Method 8020 data and may represent a false positive. The San Joaquin County Environmental Health Division (SJCEHD) issued a `no further action' letter in J nuary 1997 (misdated January 3, 1996) for the fuel UST removals. The potential presence of MTBE in groundwater near the former fuel USTs should be confirmed using EPA Test Method 8260 to d termine if regulatory groundwater quality limits have been exceeded. The Site is bounded by I Ph Street to the north, Corral lAollow Road to the east and Krohn Road to the southwest. Adjacent facilities include a Chevron service station and commercial development to the east and residential development to the north and south. Based on the information presented in this ISA, the following recognized environmental conditions Project No.S8225-06-146 -i- May 25,2001