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WSP07016
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Last modified
1/26/2010 2:25:22 PM
Creation date
10/12/2006 2:03:32 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8276.800
Description
Dirty Devil Unit - Colorado River Salinity Control Program
State
UT
Basin
Colorado Mainstem
Date
5/1/1987
Title
Planning Report and Finding of No Significant Impact (FONSI)
Water Supply Pro - Doc Type
EIS
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<br />SUMMARY (Continued) <br /> <br />. <br /> <br />Five observation wells would be installed to monitor effectiveness, <br />and surface water sampling would be conducted on Muddy Creek above and <br />below the wash. <br /> <br />One well would be used to inject controllable saline water into the <br />Coconino Sandstone, which is at a depth of approximately 3,400 feet at <br />this location. The injection zone is estimated at about 800 feet thick <br />at this location. Other formation properties are identical to those <br />described for Hanksville Salt Wash, including the confining zones. At <br />the end of 50 years of pumping, the injected saline water in the aquifer <br />would extend approximately 0.25 mile from the injection well, assuming <br />no major secondary permeability through fractures. <br /> <br />Access to the site would be provided by improving for all-weather <br />use approximately 8.4 miles of an existing secondary road from Inter- <br />state 70. <br /> <br />. <br /> <br />The system would require a continuous electrical supply of approxi- <br />mately 100 kW or 700,000 kWh annually. An estimated 12.4 miles of raptor <br />safe transmission line would be constructed adjacent to an existing <br />secondary road alignment from Dog Valley Coal Mine to connect the facil- <br />ities with existing powerlines at the Dog Valley Coal Mine. A maximum of <br />10 acres of land administered by the BLM would be required for all facil- <br />ities, not including existing roads or powerline alignments. <br /> <br />With the deep-well injection of water, less water would be available <br />for wildlife and existing riparian vegetation downstream from Hanksville <br />Salt Wash. To compensate for these losses at Hanksville Salt Wash, eight <br />precipitation collection and storage devices (guzzlers) would be in- <br />stalled for wildlife use. Since these guzzlers would provide a minimal <br />water supply, each would be fenced to prevent domestic livestock use. A <br />"worst-case" plan to compensate for potential riparian habitat losses <br />includes fencing up to 4.5 miles of Muddy Creek to prevent access by <br />domestic livestock, thereby allowing the habitat to improve for wildlife <br />use. No mitigation features are planned for Emery South Salt Wash because <br />the collection facilities would be located at the mouth of the wash and <br />Muddy Creek would not be noticeably affected. The eight guzzlers would <br />be installed first, and Reclamation would then participate with State <br />and Federal wildlife agencies in a monitoring study to evaluate changes <br />in the riparian habitat caused by unit operation. The fencing of Muddy <br />Creek would be implemented only to the extent determined necessary by <br />the monitoring study. <br /> <br />Reclamation would be responsible for administration of the unit, <br />including wildlife measures. Activities, such as operation, maintenance, <br />and replacement of unit facilities, would be accomplished either by <br />contract or by Reclamation. <br /> <br />. <br /> <br />The construction cost of the recommended plan is estimated at <br />$14,950,000 based on January 1985 prices. This amount would fund 24 <br />shallow collection wells, 9,925 feet of buried pipeline, 2 injection <br />wells (1 of which would also be used for testing purposes), 2 treatment <br /> <br />S-12 <br /> <br />D02320 <br />
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