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Kennedy/Jenks Consultants Section 3: Site Description and History 3.1 Site Location and Description The site is the former Southern Pacific Transportation Company (Southern Pacific) Tracy Railyard. It covers approximately 34 acres, bounded by Sixth Street to the north, MacArthur Drive to the east, and Central Avenue to the west. Adjacent areas are a mix of commercial and residential development. A location map is provided as Figure 1 of the Remedial Investigation Work Plan (RI Work Plan), and a site map showing the Railyard limits is presented as Figure 2 of the RI Work Plan. Previously, the site was used as a Southern Pacific maintenance facility, which was decommissioned in the 1940s. It was later used for a rail welding facility. All operations had ceased and a majority of the structures and railroad tracks were removed in the 1980s. The site is currently vacant. 3.2 Specific Operable Unit Locations and Descriptions The Railyard is divided into four OUs (Figure 2 of the RI Work Plan). The planned subsurface investigations will vary between the four OUs, contingent on past activities at each OU (including remedial activities) as well as current and anticipated future land uses. A brief description of the OU boundaries, areas of interest (AOIs), and investigation objectives are provided below. More detail on each OU and, as applicable, AOIs within each OU, is provided in the RI Work Plan Section 2.0. 3.2.1 Operable Unit 1 OU-1 consists of approximately 17 acres occupying the eastern portion of the Railyard bounded on the north by the railroad right-of-way along Sixth Street, on the east by MacArthur Drive, on the south by Gonzales Street, and on the west by the extended alignment of East Street along the eastern edge of 01-1-2. Considering results of past investigations and remedial actions conducted to address lead in soils in this area, three general areas of interest (AOIs) were identified within OU-1 (refer to Figure 2 of the RI Work Plan) for further evaluation in the remedial investigation (RI): • AOI 1 — Remediated soils • AOI 2— Stabilized lead • AOI 3— Residual elevated lead 3.2.2 Operable Unit 2 OU-2 consists of approximately 16 acres occupying the western portion of the Railyard bounded on the north by the railroad right-of-way along the southern edge of OU-4 south of Sixth Street, on the east by the extended alignment of East Street along the western edge of OU1, on the south by Fourth Street, and on the west by the railroad right-of-way along the east edge of Site Health and Safety Plan Page 4 Former Tracy Railyard, Tracy, California g:tis-groupWdnunl ob10510565777.03_uprr104reporulwodc plan4i finallappendicesWppc_haspWpc_text.doc