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<br />. <br /> <br />SUMMARY SHEETS <br /> <br />LOCATION <br /> <br />The proposed features to be constructed for the Dirty Devil River <br />Unit would be located in Emery and Wayne Counties in south-central Utah <br />in the Upper Colorado River Basin. <br /> <br />PLAN <br /> <br />The unit would be designed to reduce the salinity of the Dirty <br />Devil and Colorado Rivers by collecting saline spring water in Hanksville <br />Salt Wash and Emery South Salt Wash and disposing of it by deep well <br />injection. Collection would be accomplished by pumping surface and <br />alluvial water from shallow wells. This water would be filtered and <br />chemically stabilized, after which it would be injected into a deeply <br />buried geologic formation, the Coconino Sandstone, where it would be <br />stored indefinitely, isolated from any fresh water aquifer now in use. <br />The injection, observation, and collection wells; powerlines; roads; and <br />the surface treatment facilities at both washes would be constructed and <br />be in operation within a 3-year period. The only alternative to the <br />recommended plan is no action. <br /> <br />. <br /> <br />To reduce adverse impacts on wildlife at Hanksville Salt Wash, eight <br />water precipitation collection and storage devices, referred to as guz- <br />zlers, would be installed for wildlife use. Since these guzzlers provide <br />minimal water supply, each would be fenced to prevent domestic livestock <br />use. These guzzlers would compensate for loss of water now available <br />for wildlife. Reclamation would fund and participate with State and <br />Federal wildlife agencies in a monitoring study to evaluate changes in <br />the riparian habitat caused by unit operation. Based on monitoring re- <br />sults, additional mitigation may be needed and could consist of fencing <br />as much as 2.5 miles of Muddy Creek from domestic livestock. This fenc- <br />ing would allow the habitat to improve for wildlife species. <br /> <br />EFFECTS ON THE COLORADO RIVER <br /> <br />Decrease in salt load (tons) <br />Annual reduction in flow (acre-feet) <br />Effect of reduction in salt load at <br />Imperial Dam (mg/L) <br /> <br />20,900 <br />2,000 <br /> <br />1.9 <br /> <br />UNIT FEATURES <br /> <br />. <br /> <br />Shallow collection wells <br />Monitoring wells <br />Injection wells (4,000 to 5,000 feet deep) <br />Treatment and injection plants <br /> <br />002340 <br /> <br />24 <br />10 <br />2 <br />2 <br /> <br />S-l <br />