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<br />SUMMARY (Continued) <br /> <br />. <br /> <br />of according to EPA regulations. <br />ready for injection. <br /> <br />A holding pond would contain water <br /> <br />Five observstion wells would be installed near the collection site <br />to monitor salinity reduction for the life of the unit. Surface water <br />sampling above and below the confluence of the wash with Muddy Creek <br />would also continue after construction. <br /> <br />Access to the site would be provided by 13.6 miles of an existing <br />road off State Highway 24. The last 5.6 miles of rosd would be improved <br />to provide all-weather access. <br /> <br />The operation of the facilities at Hanksville Salt Wash would require <br />a continuous electrical supply of approximately 600 kilowatts (kW) and use <br />approximately 5 million kilowatthours (kWh) annually. Raptor safe trans- <br />mission lines would be constructed for 13.2 miles adjacent to access road <br />alignment to tie existing powerlines along State Highway 24 to unit facil- <br />ities. A maximum of 15 acres of land administered by BLM would be required <br />for all planned facilities, not including existing roads or powerlines. <br /> <br />. <br /> <br />The approximately 1,000-foot-thick Coconino Sandstone is favorable <br />for injection because it is permeable, it is about 3,700 feet underground <br />at this location, and it is thought to have competent confining formations <br />above and below it. All confining zones have low permeabllity. The <br />entire 2.5 cfs could be injected into one well while maintaining efficient <br />injection pressures over a 50-year operation period without fracturing the <br />disposal formation. At the end of 50 years of pumping, the injected <br />saline water in the aquifer would extend approximately 0.65 mile from the <br />injection well, assuming no significant secondary permeability through <br />fractures. <br /> <br />Salt loading at Emery South Salt Wash would be reduced by an annual <br />average of 6,600 tons. Facllities at Emery South Salt Wash would be <br />constructed to inject 0.25 cfs of saline ground water and minimal surface <br />water flows into the Coconino Sandstone. The collection facilities would <br />be similar to those at Hanksville Salt Wash. Saline water would be pumped <br />directly from 10 alluvial collection wells through 7,200 feet of buried <br />pipe to disposal facilities housed in a 50-foot-square building. The <br />designs, drilling, and operation of the disposal facilities would be <br />similar, although on a smaller scale, to those at Hanksville Salt Wash. <br /> <br />. <br /> <br />Outside facilities include synthetic, membrane-lined equalization, <br />evaporation, and holding basins. An equalization basin sized for con- <br />tinuous 24-hour operation would regulate flows to the filtration system <br />feed pumps. Backwash from the filtration system would be disposed of in <br />an on-site evaporation basin. While no hazardous wastes are anticipated, <br />the backwash from the filtration would continuously be analyzed for <br />hazardous wastes and, if any are generated, they would be disposed of <br />according to EPA regulations. A holding pond would contain water ready <br />for injection. 002319 <br /> <br />S-ll <br />