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conditions encountered, an addendum to this Work Plan will be prepared to document the encountered conditions and to provide the procedures and rationale for the planned additional characterization. 1.2 SUMMARY OF SITE DESCRIPTION AND HISTORY The Site includes three parcels totaling approximately 2.8 acres in area. The three parcels are referred to as the southern, northern, and western parcels. A brick warehouse building, dating from the 19th century, with a concrete slab floor (installed sometime after 1975) is located on the southern parcel. The exterior portion of the southern parcel is paved with asphalt concrete, and the northern and western parcels are unpaved. Figure 2 illustrates the parcel boundaries, the building location, and the adjacent property land uses, which include an elementary school, two residences (one including a small vineyard), a larger vineyard, a church,and two unpaved parking areas. Douglas H. and L.K. Winn own all three parcels. D.H. Winn Trucking Company (Winn)uses the Site as a commercial trucking terminal for its business of transporting gravel, asphalt,concrete, and fill dirt(none of these materials are stored at the Site). Truck maintenance and repair, as well as administrative office work, are performed inside the building, and truck washing occurs on a concrete-slab wash rack immediately outside the south side of the building. Three aboveground storage tanks (ASTs) for gear oil, motor oil, and waste oil are located inside the building, as is an aboveground filter unit for the wash water collected from the exterior wash rack. The northern and western parcels are used for car and truck parking. In 1995, a surface spill of 105 gallons of diesel fuel occurred at the southern parcel. 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 1998, a 10,000-gallon underground storage tank (UST), which was used for storing waste oil and/or diesel fuel, was removed, along with some moderately contaminated soil, from near the southern boundary of the Site. Minor levels of fuel constituents were detected in soil samples collected from the bottom of the excavation, but the County required no further action. In 1999, the County found various waste storage and handling violations at the southern parcel, including 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. Known previous uses of the southern parcel include a grain warehouse, a train stop, a lumber company, a brick-making factory, and a rustic furniture company (including sandblasting operations). The known previous use of the western parcel and the southern portion of the northern parcel was a railroad right of way. So far as is known, the northern portion of the northern parcel has never been developed for any previous use. Additional information regarding the Site and vicinity properties is available in the Phase I ESA report [NOA, 2002], including photographs of the Site. URS personnel independently visited the Site in December 2002 and confirmed that the Site features were generally as described in the Phase I ESA report. URS personnel noted that the apparent area of the former UST is covered with a portland-cement concrete slab and the surface drainage for the southern parcel is to a drop inlet located near the eastern edge of the parcel. Page 2 PAPEA Lockeford\Work PIanU.ockeford WP.doc