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w r f:�rojecu�SE30�tylmi.rep 1.0 INTRODUMON 1,1 Site Description The subject site,referred to as the Thomas Yard,is a small trucking terminal yard located at 3437 Newton Road, Stockton (Figure 1 - Site Plan). The yard is a separately leased portion of the several acre Delta Truck Sales property which includes truck sales, fueling, + and rzpa+r facilities bounded by Newton Road, Cherokee Road, and California State Highway 99. The Thomas Yard itself consists of a fenced, partially asphalt paved area approximately 100 by 200 feet. There is a garage-type building on the site with roll-up doors on either side and several offices. Next to the building is an open excavation surrounded by fencing where two underground storage tanks and piping were removed in January 1989. Approximately 300 cubic yards of material consisting of backfill and native soil was removed during the tank excavation and stockpiled on site on plastic. Ground water levels in nearby monitoring wells show that the water table in this area is at depth of approximately t. � a dep pg y 85 fee 1.2 Objective and Scope of Work This investigation was prompted by the San Joaquin County Department of Public Health Services and Delta Truck Sales when hydrocarbons were reported in soil samples taken in i January 1989 from native soil beneath the former underground tank locations. The objectives of this project, as outlined in ESOs approved work plan to San 3oaquin County dated October 8, 1990 are to: I. 1) Assess the vertical and lateral extent of soil containing hydrocarbons beneath the building adjacent to the former tank excavation by drilling and sampling soil borings 2) Deepen and expand the exv..vation(overexcavate)to remove as much of this soil as possible,without affecthig the building. Soil samples obtained while excavating T -T_ will be analyzed to verify removal of-soil-containing hydrocarbons. ii �; _ 1