_PERMIT FILE - M2000002 (15) - Laserfiche WebLink

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The mining operation will intercept the alluvial aquifer that supplies water to the South Platte River. The evaporative losses at the site will consist of the exposed water within the dewatering trench and the two settling ponds. The dewatering trench will expose approximately 1.2 acres while the settling ponds will expose an additional 2.0 acres. Total exposed surface area in the dewatering trench and settling ponds will be approximately 3.2 acres and will result in a net annual evaporation of 8.5 acre-fI. As material is excavated, i[ will be conveyed on belts to an existing mining operation. The water contained in the material when mined is considered a consumptive use. The operator anticipates that 625,000 tons of material will be mined and washed from the area annually. At 3% moisture content by weight, as measured in stockpiles by Mobile Premix Concrete, Inc., the depletion would total 13.8 acre-feet per year. Water will also be applied to haul roads and stockpiles for dust control from a 4,000 gallon capacity water truck three days a week during the year. This results in a consumptive use of 2.0 acre-feet per year. The estimated total annual consumptive use associated with the mining operation is 24.3 acre- feet. All estimated uses are summarized as follows: Evaporation 8.5 acre-feet Moisture Retained in Product 13.8 acre-feet Dust Control 2.0 acre-feet Total 24.3 acre-feet Water Rights for Augmentation The augmentation for water losses will be accounted for in an approved Substitute Water Supply Plan (SWSP) submitted to the State Engineers office. As a component of the Substitute Supply Plan, the operator will provide the necessary water rights for all water losses during the operation. A copy of the approved plan will be submitted to DMG when it is received. A court approved augmentation plan will not be required for this site because it will be lined for water storage. Surrounding Water Rights Exhibit G-1 shows the permitted and/or adjudicated water rights within''/x mile of the Tanabe Pit. Wells and water right tabulations obtained from the State Engineers Office were used to locate the surrounding water rights and well permits located on Exhibit G-]. Although there may be other wells in the area, they are not registered and permitted with The State Engineers Office. These tabulations are included in Exhibit G-2. As required by the State Engineers Office, waiver agreements will be acquired from well owners within 600 feet of the pit. TnnnGe Pot OMG 1 /? Permit Pnge l1 of d6