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L <br /> floating product. A description of the dual phase extraction <br /> technology is included in Section 3 - Technical Description of Dual <br /> Phase Extraction Technology. <br /> • Ground Water Extraction: Five new ground water extraction wells <br /> will be installed as part of this remedial action. <br /> • Soil Vapor Extraction: Three soil vapor extraction wells will be <br /> installed at the site as part of this remedial action. <br /> Extracted ground water, soil vapor, and floating product will be <br /> transferred to the Treatment System via subsurface piping. At the <br /> Treatment System, the vapor stream will be separated from the liquid <br /> stream. The vapor stream is routed to a catalytic oxidation system, where <br /> volatile organic compounds (VOCs) in the vapor stream are destroyed. <br /> The liquid stream is first routed to an oil/water separator tank, for <br /> removal of floating product, and then to a multi-stage diffuser. Floating <br /> product separated from the liquid stream is transferred to a holding tank. <br /> VOCs in ground water are removed from ground water by air stripping at <br /> the multi stage diffuser. Off-gases from the multi-stage diffuser are <br /> routed to the catalytic oxidation system, while ground water effluent will <br /> be routed through two granular activated carbon units, then reinjected to <br /> the subsurface. <br /> A detailed description of each of the components of the Treatment System <br /> is included in Section 5 - Description of the Remedial Action. <br /> Site Description and History <br /> The Tracy Yard is at the southeast corner of Sixth and MacArthur Drive in <br /> Tracy, California (Figure 1-1). The site is located in the northern half of <br /> the northwestern quarter of Section 27, Township 2 South, Range 5 East, <br /> of the Mount Diablo Baseline and Meridian. Land use in the immediate <br /> vicinity of the Tracy Yard includes: industrial areas to the north, <br /> commercial areas to the west, and agricultural lands to the east and south. <br /> A site map of the Tracy Yard is shown in Figure 1-2. The Tracy Yard was <br /> built in the early 1960's. Historically, it served primarily as a maintenance <br /> and refueling facility for locomotive operations. Light maintenance <br /> activities were performed in the Engine House, while diesel and <br /> locomotive refueling activities were conducted in an area southwest of the <br /> Engine House. <br /> 1-2 <br />