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property but parallels the south property line of the site. The Fulton Ditch is not shown on this <br /> map but is a little over 2 miles east of this site. <br /> Evaporative losses depend on the exposed surface area, which will vary throughout the life <br /> of the mining operation. The estimated maximum area of exposed water surface over the life of <br /> the mine will be 17 acres. <br /> The gross annual evaporation for the site is 43 inches or 3.6 feet, which was taken from the <br /> NOAA Technical Report NWS 33, Evaporation Atlas for the Contiguous 48 United States. <br /> Monthly evaporation percentages, as suggested by the SEO were used to calculate monthly <br /> evaporation. The Climatology of the United State No 81,provided the estimated annual <br /> precipitation. The annual mean precipitation is 13.81 inches which was taken from the Brighton <br /> weather stations. <br /> The effective precipitation is computed to determine the net evaporation from the exposed <br /> groundwater. Effective precipitation is calculated as 70%of the average annual precipitation and <br /> is 0.81 feet for Morton Lakes. The net evaporation is calculated by subtracting the effective <br /> precipitation from the gross evaporation. The net annual evaporation is approximately 2.78 feet, <br /> thus the resulting net annual evaporation consumptive use during the mining operation is 47.22 <br /> acre-feet. The other stages of this <br /> mining site will be will be lined prior to mining and reclamation and will not require <br /> augmentation of evaporative losses. <br /> The water retained in the mined material is considered a consumptive use. The anticipated <br /> amount of material that will be mined each year will range from 50,000 to 2,000,000 tons, as <br /> they are ramping up and down production. Assuming 4%moisture content by weight as <br /> suggested by the SEO,the total annual depletion is 58.87 acre-feet. There will be approximately <br /> 2 acre-feet of water used for dust control. Concrete will be produced at this site, approximately <br /> 50,000 cubic yards or 10.33 acre-feet of water will be needed annually. <br /> 15 <br />