2013-08-21_HYDROLOGY - M1977559 - Laserfiche WebLink

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DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER RESOURCES Mr. Paul Bruss, E.I. r/BBA Water Consultants, Inc. 333 West Hampden Avenue, Suite 1050 Englewood, CO 80110 Canon City East Pit M -77 -559 Substitute Water Supply Plan Section 1, Township 19S, Range 70W, 6th PM Water Division 2, Water District 12 SWSP 1D 3010 RE: August 16, 2013 Plan Period: June 1, 2013 — May 31, 2015 Dear Mr. Bruss: fC John W. Hickenlooper Governor Mike King Executive Director Dick Wolfe, P.E. Director /State Engineer RECEIVED `'BUG 21 2013 DIVISION OF RECLAMATION MINING AND SAFETY We have reviewed your May 10, 2013 letter requesting renewal of the substitute water supply plan for the Canon City East pit owned by Valco, Inc. (Valco). The required $300 fee has been paid (receipt no. 3660293). This approval will cover the period June 1, 2013 through May 31, 2015. PLAN OF OPERATION The Canon City East pit was previously operated under a combined SWSP plan, together with the Lamar East Pit and the Rocky Ford East Pit. Valco has recently conveyed the Lamar East Pit to the City of Lamar, and is separating the Rocky Ford East pit from the combined plan due to changes in the water supply. Active mining has finished at all three pits. This SWSP request covers the depletions from the Canon City East pit only. Pre -1981 Post -1981 Pit Well Permit No. Well ID Total Exposure Exposure Exposure (acres) (acres) Canon City East 52183 -F 1205760 30.1 15.4 14.7 DEPLETIONS The Canon City East pit is presently undergoing reclamation in accordance with the DRMS permit. During the final reclamation process, the pit on the west side of the property will have to be dewatered for approximately four to six weeks. Valco is requesting to temporarily store the dewatering water in Pueblo Reservoir in an "if and when" account allocated to the Upper Arkansas Water Conservancy District ( "UAWCD ") and release it in exchange for refilling the pit once the process is complete. Valco will measure the volume of water pumped from the pit during the initial dewatering through a flume as it is delivered to the Arkansas River. This volume of water will then be released back to the Arkansas River to offset the depletions from the refilling. Evaporative depletions have been calculated using the maximum surface area of the pit, which is 30.1 acres. As reclamation continues, Valco will reduce the surface area subject to evaporation under the SWSP as documented by the Water Commissioner. Office of the State Engineer 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303 - 866 -3581 • Fax: 303 - 866 -3589 www.water.state.co.us