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SUMMARY (Continued) . for environmental, social, and economic concerns. Based on the results of these analyses, the deep-well injection of saline spring water in Hanksville Salt Wash and Emery South Salt Wash was selected as the rec- ommended plan. This alternative and the no-action alternative are sum- marized in Summary Table 1 and Summary Table 2 on the following pages and discussed below. Recommended Plan of Development The recommended plan would include separate facilities to collect flows from streams below two saline springs, Hanksville Salt Wash and Emery South Salt Wash, and dispose of the water by deep-well injection into the Coconino Sandstone, a geologic formation approximately 3,400 to 3,700 feet underground and thought to be hydraulically isolated. A total flow of 2.75 cubic feet per second (cfs) would be injected, reducing the salt loading from the unit area by about 20,900 tons per year at an esti- mated cost effectiveness of $97 per ton of salt removed. Flows of the Colorado River would be reduced by about 2,000 acre-feet per year. Measures are included to compensate for wildlife habitat losses that would result from plan development. . An injection well would be installed initially at Emery South Salt Wash and tested to characterize the receiving formation. A second well would then be drilled at Hanksville Salt Wash. Once initiated, construc- tion of the entire unit is expected to be completed within a 3-year period. Reclamation would recommend that use of Colorado River Storage Project (CRSP) power be included in legislation authorizing the unit. Salt loading at Hanksville Salt Wash would be reduced by an annual average of 14,300 tons. Major facilities in Hanksville Salt Wash would include 14 alluvial wells to collect 2.5 cfs of saline water which would be pumped through 2,725 feet of buried pipe for treatment and subsequent disposal through an injection well into the Coconino Sandstone. Disposal facilities would include one injection well, a sand filtra- tion system to remove debris and sediment, chemical equipment, injection pumps, guard filters to remove any residual sediment, instrumentation to monitor chemical and physical treatment and injection, and operation and maintenance offices. The equipment would be housed in a one-story build- ing approximately 80 feet square and would include an automatic shutdown device. . Other facilities include synthetic, membrane-lined equalization, evaporation, and holding basins. An equalization basin sized for con- tinuous 24-hour operation would regulate flows to the filtration system feed pumps. Backwash from the filtration system would be disposed of in an on-site evaporation basin. No hazardous wastes are anticipated; how- ever, the backwash from the filtration would continuously be analyzed for hazardous wastes and, if any are generated, they would be disposed S-8 002316