COMPLIANCE INFO_FILE 7 - Laserfiche WebLink

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Site Description and History This section discusses the general history and physiography of the Tracy Yard site. Site location and land use are described, hazardous chemicals associated with site activities and known releases are identified, and general site characteristics are presented. Location The Tracy Yard site is at the southeast corner of Sixth Street and MacArthur Drive in Tracv, California (Figure 1-1). The remedial action which will address impact to soil and ground water is a dual phase extraction system for the simultaneous extraction from a single extraction well soil gas, ground water, and floating product. A general site layout and piping diagrams are shown on Figure 1-2. Operations History The site was built in the early 1960's. Historically, it served primarily as a maintenance and refueling facility, with light maintenance activities performed in the Engine House and diesel and locomotive refueling conducted in an area southwest of this structure. This area, as well as the area in which former locomotive diesel unloading activities took place (Engine House), and the collection conveyance, and subsequent treatment of hydrocarbon waste streams, are the probable sources for diesel- impacted soil and ground water. Structures associated with the collection, conveyance, and treatment activities are believed to be collection sumps, the drainage interceptors for storm water runoff, and oily discharges from site operations, and the three former surface impoundments which served as an oil/water separator. On-site locomotive maintenance operations ceased in 1987. At that time, refueling was drastically reduced, and is currently performed at alternate off-site locations or via tank truck. The above ground tanks were converted into an oil/water separator and current and known further operations are primarily for railcar storage and hookup. 1-2