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Wash Water <br />Washing operations will require approximately 1,500 gallons per <br />minute. This water will be stored in a series of sediment ponds <br />and will be recycled. Preliminary estimates on cansumption are <br />1.0 acre-feet per year. <br />Dust Control <br />Dust control will require the watering of haul roads at specified <br />intervals. The proposed operation will located the portable <br />screen/crusher adjacent to mining operations, reducing the amount <br />of haul roads to be used. Hoth the access and haul roads will be <br />watered to control dust. The watering will mainly be done during <br />the dryer months of May through September and at other times as <br />needed. The average application to the area would be about 4,000 <br />gallons with a minimum of three applications per day being made <br />for about 80 days per year. This would equate to about 2.9 acre- <br />feet per year. <br />Lake Evacoration <br />The Perry Pit operation will create three open water bodies with <br />a total of 57.7 acres of surface area. This amount could be <br />reduced by backfilling some of the lake areas with overburden or <br />other appropriate materials. The average annual evaporation in <br />this area is about 30 inches per year. <br />This property is located on the floodplain of the South Platte <br />River and may claim some historic consumption based partial <br />subirrigation of the parts of the property, less the historic <br />precipitation. Projected evaporation losses are summarized on <br />the following table: <br />Total <br />Evapor- Subirrigation Effective Net Net <br />Phase ation Use Precipitation Evacoration Evacoration <br />I 30" 24" 11" 17" 46.3 ac-f t. <br />II 30" 27" 11" 14" 13.4 ac-f t. <br />IIZ 30" 24" 11" 17" 19.1 ac-f t. <br />TOTAL 78.8 ac-f L. <br />If these figures are assumed to be correct, the incremental use <br />created by the lake evaporation totals 78.8 acre-feet. <br />G-3 <br />