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<br />70-percent recovery reverse osmosis (RO) process with a conventional <br />lllne-soda pretreabnent process. <br />6. Product Water Pipeline. From the desalting plant, the <br />product water would be delivered to the river about 3,200 feet up- <br />stream of the treabnent plant through a 30-inch pipeline terminating <br />at a reinforced-concrete outlet structure designed to withstand high <br />riverflows. For most of its length, the alinement would follow the <br />feed water pipeline, <br />Product water would be delivered to the river at the rate of <br />8.7 ft3/s or an average of 6,000 acre-feet per year over the 50-year <br />life of the project. The product water discharge point was placed as <br />far upstream as gravity flow would permit for the sake of maintaining <br />riverflows for the endangered woundfin minnow. Had this not been a <br />concern, a 300-foot, 18-inch pipe would be used for release adjacent <br />to the desalting plant. <br />7. Brine Pipeline. An 8. 95-mile pipeline would transport the <br />brine and pretreabnent sludge to the disposal facility by using the <br />residual pressure at the brine outlet of the reverse osmosis units. <br />The alinement would follow the highway right-of-way for most of <br />the distance to the disposal facility. From the desalting plantsite to <br />the highway, the alinement would pass through private property and <br />cross three roads. <br />8. Purgatory Flat Disposal Facility. For feasibility design, the <br />solar evaporation process would be used to dispose of reject brine, <br />and the sludge would be disposed separately by burial. The sludge, <br />consisting primarily of calcium carbonate, would be separated from the <br />brine by gravity as it passes through one of three sludge settling <br />ponds. The designed travel time through a settling pond is more <br />than 10 times the sludge settling time to achieve 100 percent sepa- <br />ration of the sludge from the brine. <br />The lined (20 mil PVC) brine ponds are designed for a three <br />stage operation. Precipitation of salts should only occur in the final <br />Stage III Ponds. With this in mind, the Stage III Ponds would be <br /> <br />002519 <br /> <br />10 <br />