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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 for this plan. 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 an operator of a 10,000-gallon UST for storing waste oil. 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. However, 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 • 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 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. 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) were removed from the Site. One soil sample from the bottom of the excavation contained 3.9 mg/kg of TPH-D and no detectable BTEX, and another soil sample from the bottom of the excavation contained 6.7 ug/kg of xylenes and no other detectable constituents. Based on this data, the County issued a letter,dated November 3, 1999, stating that no further action was required at that time. 3.4 PHYSICAL AND ENVIRONMENTAL CHARACTERISTICS The information presented in the following subsections is from the Phase I ESA report [NOA, 2002] as referenced and from independent confirmation and research conducted by URS. 3.4.1 Site Topography Based on a review of the USGS 7.5 Minute Topographic Series, Lockeford Quadrangle Map, the Site has a surface elevation of approximately 100 feet above mean sea level. The regional surface topography slopes downward gently to the southwest at about five feet per mile,except about '/a mile northwest of the Site, where the land surface drops abruptly about 40 feet to the floodplain of the Mokelumne River. The river itself appears on the quadrangle map about one mile northwest of the Site. The Site is relatively flat; at least some portions of the Site appear to drain toward the northeast. Page 9 PAPEA Lockeford\Work Plan\Lockeford WP.doc