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• ~Latement of Ylen Sor Augmentation <br />7'he augmentation plan utilizes two-Laramie-Fox Hills <br />wells with a combined average annual appropriation of <br />167 ac. it. to augment calls on tributary water <br />resulting from the consumptive use of water at the <br />mine location. Well 24651-F could be used to auq_ment <br />evaporation of poor guolity water in the pit. <br />Consumptive uses/depletions will be limited to <br />irrigation, evaporation from pits and sumps, and when <br />operations dictate, the removal of water from bits and <br />sumps by waLertruck for dust suppression. Gtherwise <br />ell dust suppression water needs will be derived from <br />the Laramie - Fox Nills aquifer wells. A totalizing <br />slow meter together with records of load count (3000 <br />gallons/load) will be maintained so as to determine <br />depletions related to the use o3 water for dust <br />suppression obtained from sumps or pits. Ground <br />surveys on a as needed basis will be conducted to <br />determine the average free water surface. Maximum <br />annual consumptive use is estimated to be 20.2 ac.-f t. <br />from a combination of eva_oration and dust <br />suppression. T'he maximum consumptive use estimate of <br />20.2 ac.-f t. is based upon dust suppression needs of <br />• 6.0 ac.-ft. ii totally obtained Srom sumps or the <br />pit. Actual depletions subject to augmentation are <br />anticipated to range from 14.2 ac.-f t. to 20.2 ac.-f~t. <br />per year. <br />7'h ere is no known existence of injury to any owner of <br />or persons entitled to the use of water under a vested <br />water right or a decreed conditional water right. <br />Section ii, part A addresses historical water uses in <br />the area. The Division Engineer or the Water <br />Commissioner will direct the amount of augmentation <br />required to mitigate potential injury to owner or <br />persons entitled to the use of water. The amount of <br />water to be augmented in a given month when a call <br />exists will be determined by computing evaporation <br />bases on percent of annual evaporation for the month <br />and adding any dust suppression and irrigation <br />depletions not derived from the Laramie-Fox Hills <br />aquifer appropriation. <br />Any required augmentations will be pumped Srom the <br />Laramie-Fox Hills aquifer well(s), metered, and <br />delivered by pipe directly to an augmentation <br />structure, (Sediment Pond No. 2). ,_ <br />• Augmentation through inf~iltretion in a given sediment <br />pond will not interfere with that pond's capacity to <br />control runoff- from a 10 year, 24 hour precipitation <br />event. Also, the infiltration capacity of the ponds <br />would be maintained through the removal of accumulated <br />sediment that may effect pond permeability and <br />ultimately successful augmentation. <br />,~~ <br />