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Kennedy/Jenks Consultants remedial actions where warranted, and will help to expedite future productive use of the OUs where the RI results indicate no future action is needed. 1.4 Site Description and History The full Railyard site covers approximately 34 acres, bounded by Sixth Street to the north, MacArthur Drive to the east and Central Avenue to the west, as shown on Figure 2. Areas adjacent to the site are a mix of commercial and residential development. The site was previously used as a Southern Pacific Transportation Company (Southern Pacific) maintenance facility, which was decommissioned in the 1940s. It was later used as a rail welding facility. A historical valuation map showing many of the site features and OU boundaries is provided as Figure 3. All operations had ceased and a majority of the structures and railroad tracks were removed in the 1980s. The site is currently vacant. Southern Pacific was acquired by Union Pacific in 1996. In 1991, the development firm Braddock and Logan Associates was considering purchase of the Railyard and an adjacent agricultural parcel for residential development. To that end, they initiated a Level One Environmental Site Investigation (ENGEO, 1991). This study identified several areas of potential concern on the Railyard property, including former wastewater ponds, an aboveground storage tank, three metal standpipes and a concrete-lined sump filled with an oily substance, maintenance facilities and a large stockpile of soil and debris. To investigate whether environmental impacts had occurred in these areas, a Transfer Assessment Workplan was prepared (Anderson, 1991), but this investigation was not implemented as proposed. Southern Pacific did subsequently proceed with a related scope of investigation for OU-1, as described below. Background information for each of the OUs is summarized as follows. 1.4.1 Operable Unit 1 OU-1 consists of approximately 17 acres in the eastern portion of the Railyard, bounded on the north by the railroad right-of-way that fronts Sixth Street, on the east by MacArthur Drive, on the south by Gonzalez Street, and on the west by the extended alignment of East Street that serves as the boundary between OU-1 and OU-2 (Figure 2). Past OU-1 improvements included railroad tracks, wheel shops, locker rooms, planking, oiled macadam, rail beds, a coal house, refuse pit, and various air and water pipelines. A rail welding facility was operated in OU-1 until the 1980s. In the late 1980s to early 1990s, the southeast portion of the OU, along MacArthur Drive, was leased to American Transit Mix Company, Inc./RMC Lonestar. Their operations included two underground storage tanks (USTs) (500-gallon unleaded gasoline and 1,000-gallon diesel), which were removed in 1989 (Industrial Compliance [IC], 1992a). As part of the UST removal, 16 cubic yards (cy) of soil containing petroleum hydrocarbons were excavated and transported offsite for disposal. Three groundwater monitoring wells, designated MW-1(RMC), MW-2(RMC) and MW-3(RMC), were installed in this southeastern corner of OU-1 and sampled for three consecutive calendar quarters. No analytes were detected above laboratory reporting limits, and the wells were reportedly abandoned in late 1992 (Terranext Remedial Investigation Work Plan Page 2 Former Tracy Railyard, Tracy, California g:Vs-groupladminWb105%0565777.03_uprr%094eportslwork planVi finalltextdoc