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8.0 CONCLUSIONS AND RECOMMENDATIONS The Site was developed as a Caltrans maintenance statin in 1970 including the office, equipment building, warehouse and loading dock, gas house, material storage bins, wash rack and two 7,600- liter (2,000-gallon) fuel USTs. A wood storage shed w is 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 AST was subsequently installed at the Site. Petroleum hydrocarbons were not detected in soil and groundwater samples collected during the 1996 fuel UST removal activities with the excepti n of an MTBE concentration of 31 µg11 reported for a grab groundwater sample. The reported presence of MTBE was based on EPA Test Method 8020 data and may represent a false positive. The SJCEHD issued a `no further action' letter in January 1997 (misdated January 3, 1996) for the fue UST removals. The potential presence of MTBE in groundwater near the former fuel USTs should be confirmed using EPA Test Method 8260 to determine if regulatory groundwater quality limits havc been exceeded. i The Site is bounded by I Vh Street to the north, Corral Follow 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 exist at the Site: I • Surface stains of unknown origin in southeastern portion of the Site. • Former waste oil and fuel USTs. • Former septic tank and leach field west of the equip nt building. • Emulsion, asphalt, waste oil and kerosene ASTs. • Hydraulic lift in the equipment building. • Wash rack and mud rinse area west of the equipment building. A determination of the extent of potential soil impacts and an assessment of groundwater occurrence and quality associated with the recognized environmental conditions will be necessary prior to evaluating remedial response actions for specific future land use options. Targeted site investigations should be designed to evaluate potential soil and groundwater impacts with respect to specific project Project No.S8225-06-146 -27- May 25,2001