2013-01-03_HYDROLOGY - M2011054 - Laserfiche WebLink

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Mr. Peter Foster, P.E. December 24, 2012 DeBeque Pit (M2011 -054) SWSP Page 3 dewatering stops and based on the 2012 assumed call period on the Colorado River below Shoshone Power Plant, you determined that there are no out -of- priority depletions during the first year of operation and out of priority lagged depletions resulting from filling of the pit total 2.55 acre -feet in the second year if the dewatering ceases (Table 4). 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 call period on the Colorado River below Shoshone Power Plant, out of priority lagged walk -away evaporative depletions total 22.03 acre -feet (Table 5). The total out -of- priority depletions from pit filling and out of priority lagged walk -away evaporative depletions are 24.58 acre -feet (Table 6). In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division of Reclamation, Mining, and Safety ( "DRMS "), all sand and gravel mining operators must comply with the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of water resources. The April 30, 2010 letter from DRMS requires that you provide information to DRMS to demonstrate you can replace long term injurious stream depletions that result from mining related exposure of ground water. In accordance with approach nos. 1 and 3, you have indicated that a bond has been obtained for $423,630.40 through the Division of Reclamation, Mining, and Safety ( "DRMS ") to assure that depletions from groundwater evaporation do not occur in the unforeseen event, or events, that would lead to the abandonment of the Pit or if dewatering ceases. Replacement United has entered into water supply contract with the Colorado River Water Conservation District ( "CRWCD ") (Contract no. CW12006). Under this contract United is entitled to the delivery of water. The contract with CRWCD is for 7.9 acre -feet 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 to the 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, the Colorado River placed a call for 111 days during the months of April through October 2002. However, to be conservative for the purpose of this SWSP you have assumed a call period of 160 days for April (4 days), May (5 days) and from the last two weeks of June through the first two weeks of November (as outlined on the attached Table 3). Therefore, based on the above, out -of- priority lagged depletions during the first year of operations is 6.15 acre -feet and during the second year of operation is 6.55 acre -feet. 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, 2012 and shall be valid through July 31, 2014 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, 2014.