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CHAPTERTWO Proposed Action an~u Alternatives <br />well field piping corridors and 30 percent of the well field piping construction corridors. The <br />total disturbance area for well field piping would be about 8.3 acres. Vegetation would be <br />removed from the entire azea, and soils would be disturbed on about 4.14 acres. <br />Piping within each subsequent mining panel would be laid out and constructed in a similaz <br />fashion. <br />2.2.1.2 Processing Plant <br />Facilities Layout <br />The general arrangement of facilities at the Piceance Site is illustrated in Figure -6, and details <br />aze shown in Figure 2-7. Five buildings would be located in the initial processin;; plant azea at <br />the Piceance Site, including an administration building, a process building, a pumphouse <br />building, a heat exchanger building, and a fifth building that would house compressors, gas-fired <br />boilers, a control room, and an electrical room. The processing plant azea would also include a <br />substation, agar-fired generator, outdoor switch geaz, a pipeline feed surge tank, a return water <br />collection tank, a cooling tower, and pazking lots. The plant azea would be about 6.5 acres in <br />size and would be entirely enclosed by a fence. All buildings in the Piceance Site processing <br />area would be painted Munsell Soil Color Chart Juniper Green or equivalent in accordance with <br />BLM requirements. An evaporation pond would be located neaz the processing plant azea. The <br />surface evaporation azea would be 13 acres. The total azea of disturbance, including the pond <br />berms, would be 23 acres. Roads, utilities, and piping networks would be located both within the <br />processing plant azea and between the production wells and the processing plant area. <br />Evaporation Pond <br />The process streams that dischazge to the evaporation pond would be the pressure: filter waste <br />solids. cooling tower blowdown, and boiler blowdown. The composition of the Piceance Site <br />evaporation pond inlet streams is provided in Table 2-4. Solids accumulation in the pond is not <br />anticipated to occur at a level that would require their removal. The pond inlet streams aze <br />described below. <br />Pressure filter waste solids aze solids that accumulate in the pressure filter, which filters the <br />mining solution just prior to it entering the pipeline to the Pazachute Site. This evaporation pond <br />inlet stream would be composed of about 20 percent solids and 80 percent liquid. The solids <br />would consist of sodium solids and insoluble grit and sediment materials. Cooling tower <br />blowdown is a purge of cooling water that has been continuously recirculated anti that contains <br />sludge created by reaction of water conditioning chemicals. About 20 to 25 percf;nt of the <br />cooling water must be purged to control the buildup of impurities as the cooling water <br />evaporates. Boiler blowdown is similar to cooling tower blowdown. It is a purge; of boiler water <br />to control impurity buildup within the boiler. <br />The 13-acre evaporation pond at the Piceance Site would be constructed with a double liner and <br />leak detection system in accordance with the requirements of the Colorado Division of Minerals <br />and Geology (CDMG). The liner system would consist of two geomembrane liners and a leak <br />detection and collection system. The top liner would be 60-mil high density polyethylene <br />2-8 <br /> <br />