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As material is excavated, it will be washed on site. The water retained in this material is <br /> considered as consumptive use. The anticipated amount of material that will be mined and <br /> washed each year is estimated at 450,000 tons. Assuming a 4 percent moisture content by <br /> weight as suggested by the State Engineer's Office, the total annual depletion is 13.2 acre-feet. <br /> Because the mining area will be isolated from the water table by installation of a slurry wall, <br /> there will be no exposed groundwater. After the site is lined with the slurry wall, the pit will be <br /> excavated and dry mined. <br /> In addition, water use at the site will include dust control. This is water applied to haul roads and <br /> stockpiles. It is estimated that one load from a 3000-gallon capacity water truck twice a day <br /> (Monday through Friday) for nine months is required for dust control. This results in a <br /> consumptive use of 3.6 acre-feet per year. <br /> Water will be used in the hatching of concrete. It is estimated that two million gallons of water <br /> will be used in the concrete production process. This results in an annual consumptive use of 6.1 <br /> acre-feet. <br /> Water will also be used in the production of asphalt. It is estimated that approximately 1.0 acre- <br /> foot per year will be used for this process. <br /> The total annual consumptive uses associated with the mining operations are as follows: <br /> Evaporation 9.1 acre-feet <br /> Moisture Retained in Product 13.2 acre-feet <br /> Dust Control 3.6 acre-feet <br /> Water Used in Concrete Production 6.1 acre-feet <br /> Water Used in Asphalt Production 1.0 acre-feet <br /> Total 33.0 acre-feet <br /> Water Rights <br /> Central Colorado Water Conservancy District will be providing the necessary water required for <br /> the mining operation using shares from Brighton Ditch. An application to temporarily change <br /> the use of the Brighton Ditch shares from agricultural use to industrial use will be submitted to <br /> the State Engineer's Office. <br /> G2 <br /> I <br />