2014-11-25_HYDROLOGY - M2011054 - Laserfiche WebLink

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Mr. Peter Foster, P.E. DeBeque Pit (M2011 -054) SWSP November 21, 2014 Page 3 this SWSP are estimated at 14.13 acre -feet for the period of August 1, 2014 through July 31, 2015. The pit must be continuously dewatered until such time as the pit can be filled by ground water infiltration during a free river period, or an amendment to the SWSP must be requested and approved to include additional replacement water to offset the volume of water required to fill the pit during the call period. You indicated that the pit will be continuously dewatered at a rate of 500 GPM. Out of priority lagged depletions resulting from filling of the pit total 0.45 acre -feet if the dewatering ceases (Table 5). Also, for the walk -away analysis you have assumed that the maximum total mined area will be limited to 11.6 acres and based on the assumed 2002 call period on the Colorado River below Shoshone Power Plant, out of priority lagged walk -away evaporative depletions total 5.02 acre -feet (Table 6). The total out -of- priority depletions from pit filling and out of priority lagged walk -away evaporative depletions are 5.31 acre -feet (Table 7). Replacement United has entered into a water supply contract with the Colorado River Water Conservation District ( "CRWCD ") (Contract no. CW12006). Under this contract, United is entitled to the delivery of 7.9 acre -feet of replacement water annually. A copy of the contract was submitted on December 17, 2012 and is attached to this letter. A 10 percent transit loss is assessed for the delivery of this replacement water. The source of replacement water from CRWCD was identified as Wolford Mountain Reservoir. Wolford Mountain Reservoir is located on the Muddy Creek drainage and it was decreed by the Division 5 Water Court in case nos. 87CW283, 95CW281 and 98CW237. Based on review of Colorado River call records below Shoshone Power Plant over the period of record from 1987 to 2011, a call was placed on the Colorado River for 111 days during the months of April through October 2002. The applicant has assumed this as a worst case scenario call period. Therefore, based on the above, out -of- priority lagged depletions during the term of this SWSP are projected to be 4.88 acre -feet. Assuming a 10% transit loss for the delivery of replacement water results in a total required replacement amount of 5.42 acre - feet/year. Conditions of Approval This SWSP is hereby approved pursuant to § 37 -90- 137(11), C.R.S., subject to the following conditions: 1. This plan is approved with the effective date of August 1, 2014 and shall be valid through July 31, 2015 unless otherwise revoked or modified. If this plan will not be made absolute by a water court action by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee of $257 no later than June 15, 2015. 2. Well permit, Permit No. 77321 -F, has been obtained for the current uses and exposed pond surface area of the gravel pit in accordance with §37 -90- 137(2) and (11), C.R.S. ni co4O ,\ 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 F 303.866.2223 www.water.state.co.us