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Operational Losses <br /> The moisture content of the material hauled off the site was assumed to be 4 ercent by weight. <br /> The annual yield for the pit was estimated at 100,000 tons of raw material. s results in an <br /> annual consumptive use of 2.94 acre-feet for wager retained in product. <br /> The total annual consumptive use for dust control was calculated at 2.0 acre/ et. The annual <br /> amount was distributed throughout the year based on the production of the m ning operation. <br /> The mine will beat the highest production during;the months of May-Septem r and in <br /> combination with the weather this period will require the greatest amount of ust control. The <br /> mine will be in production year around and therefore dust control may be req fired during all <br /> months. The monthly distribution of the water reserved for dust control is pr. ented in Table <br /> No. 2. <br /> STREAM DEPLETIONS <br /> An analysis was completed to determine the historical consumptive use associ ted with the <br /> Challenger property. The analysis was also used to determine the historical s surface return <br /> flows that accrued to the stream system during the historical irrigation practice and compare <br /> those to the stream depletions associated with the mining operation. Table No 3 and Table No. <br /> 4 have been provided to illustrate the results of the models and the associated t ing of the <br /> required replacements. <br /> Historical Stream Depletions <br /> The Challenger property was historically irrigated with 20 shares of the Hill & rush Ditch. The <br /> total acreage historically irrigated with the Hill &Brush shares is approximate] 61.5 acres. <br /> Figure 2 illustrates the historically irrigated acreage and the portion that is pres ntly under <br /> irrigation. The total acreage removed from agricultural production is approxim tely 34 acres. <br /> The property was used to grow a combination of com,alfalfa,and pasture gms A previous <br /> Substitute Water Supply Plan submitted in July 1990 quantified the historic cro ping patterns as <br /> 33%com, 33%alfalfa, and 33%pasture grass. This previous plan was also util zed for <br /> quantifying and locating the historically irrigated acreage. The previously app ved plan is <br /> included in Appendix A for your reference. <br /> A Modified Blaney-Criddle consumptive use analysis was completed for a crop tation of corn <br /> (33%), alfalfa(33%),and pasture grass(33%). Thee analysis yielded a potential rop <br /> consumptive use of 1.63 acre-ft/acre. Table No. 5 is a summary of the potential rop <br /> consumptive use analysis. A detailed analysis for the historic crop rotation is in luded in <br /> Appendix B for your review. <br /> 6 <br />