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Peter Kearl <br />November 14, 2008 <br />Page 3 <br />The HCU analysis estimated 84 AF of natural streamflow water consumed by the irrigation of 85 <br />acres of pasture grass (see Table 2). On a per acre basis, the HCU is 0.99 AF/acre. The pit area <br />is estimated to remove 28.1 acres of historical irrigated acreage. The removal of 28.1 acres of <br />historical irrigated area provides 27.7 AF of HCU credits that could be changed from irrigation <br />to industrial uses. <br />Conclusion <br />As discussed above, the annual water demands total 4.14 AF per year. The calculated water <br />supply from HCU credits totals 27.7 AF per year. Thus during average years there is excess <br />water supply available for the water demands as described in this report. Based on the analysis <br />conducted thus far, WWE has the following observations. <br />• The proposed water uses for material washing is flexible and temporary in duration. The <br />wash plant can be mobilized to the site at times when water supply is available and <br />removed from the site during water shortages. <br />• Since the water uses considered are temporary, a temporary substitute water supply plan <br />will be needed from the State Engineers Office before the irrigation water can be used for <br />industrial purposes. <br />• Given water shortages in the ditch typically starting in July, material washing will most <br />likely occur in April, May and June or during the non-irrigation months of November <br />through March. <br />• The diversions for the industrial uses is administrable by the State Engineer's Office and <br />if there is a water shortage and the M-16 priority is called out, the facility will simply not <br />wash material during the call period. <br />If you have any questions, please feel free to call or write. <br />Very truly yours, <br />WRIGHT WATER ENGINEERS, INC. <br />e <br />By <br />Peter R. Foster, P.E. <br />Senior Project Engineer