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PI MPORT (June 20,2003) LOCKEFORD ELEMENTARY SCHOOL EXPANSION 3.3.2 Onsite Storage,Treatment,and Disposal Diesel fuel was stored on-site in an underground storage tank (UST) that was removed in 1998. The former location of the UST is shown on Figure 3. According to Russell Winn, parts-cleaning solvent was used on-site in small quantities for a few years, but such usage has ceased. Currently, aboveground storage tanks (ASTs) for motor oil, gear oil, and waste oil are located in the northwest comer of the structure. A 55-gallon steel drum of power steering fluid is located inside the structure, about 20-feet west of the ASTs. No records of treatment or disposal of hazardous substances were obtained during the background research for this PEA. 3.3.3 Regulatory Status The review of selected regulatory agency databases for documented environmental concerns on the Site, or in close proximity to the Site, was conducted by NOA as part of the Phase I ESA and verified by URS for this PEA. As mentioned above, D.H. Winn Trucking, operating at the southern parcel of the Site, is listed as a RCRIS small-quantity-generator of hazardous waste, as a shipper of various wastes, and as the operator of a 10,000-gallon UST installed in 1978 for storing waste oil (Douglas Winn reports that the UST never held anything but diesel fuel). The RCRIS listing notes that the facility is not reported as a hazardous waste treatment, storage, or disposal facility and that no RCRA violations have been found at the facility. 3.3.4 Site Inspection Results San Joaquin County Environmental Health Division issued a Notice to Comply, dated November 18, 1999, as a result of a Site inspection that found the following waste storage and handling violations: • oil spilled on the ground inside the building near the filter draining bin and ASTs; • used oil in excess of 100 kilograms stored onsite for longer than 90 days; • improper labeling of used oil tank and drum of absorbent material; • waste containers not kept closed, and used absorbent not stored in a container capable of being closed and sealed; and • an inadequate spill prevention and contingency plan. A spill of 105 gallons of diesel fuel at the southern parcel was reported to the County on August 17, 1995. The County's spill report indicates that the spilled fuel was washed into the storm drain and ditch in front of the adjacent school property to the south of the Site. The report indicates that the majority of diesel and contaminated soil and water was removed and that the storm-drain, would be re-flushed. In 1996, D.H. Winn Trucking was notified of a violation relating to UST registration regulations. In December 1998, the UST and some moderately contaminated soil (TPH-D at concentrations up to 1,900 mg/kg) from around and beneath the UST were removed from the Site. The excavation extended to a depth of about 12 feet bgs. A sample collected from below one end of the excavation at a depth of about 14 feet bgs contained 3.9 mg/kg of TPH-D and no detectable 3-3 URS CORPORATION PAPEA Lockeford\Report\Lockeford Report Rev.doc