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DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER RESOURCES Mr. Todd Williams, P.E. 30 — Williams and Weiss Consulting, LLC 5255 Ronald Reagan Boulevard, Ste. 220 Johnstown, CO 80534 March 27, 2013 Re: SerFer Substitute Water gupp Plan (WDID No. 0302534) SerFer Pit, DRMS File No. Mt2008-006 (WDID No. 0303028) Section 24, T6N, R68W of the 6 P.M. Water Division 1, Water District 3 Approval Period: April 1, 2013 through March 31, 2014 Contact Phone Number for Mr. Williams: (303) 653 -3940 John W. Hickenlooper Governor Mike King Executive Director Dick Wolfe, P.E. Director /State Engineer RECEIVED MAR 2820:3 Division of Reclamation, Mining & Safety Dear Mr. Dains: This letter is in response to your letter dated February 15, 2013 on behalf of Connell Resources, Inc. (Applicant) requesting renewal of the above referenced substitute water supply plan (SWSP) for the SerFer Pit to cover depletions caused by gravel mining operations in accordance with § 37 -90- 137(11), C.R.S. The required renewal fee of $257 has been submitted (receipt no. 3658905). The most recent SWSP renewal was approved on March 30, 2012 and expires on March 31, 2013. Plan Operations This plan seeks to replace depletions resulting from the mining at the SerFer Pit. The depletions that result from the proposed dry- mining operation include evaporation, dust control, and water lost in mined product. The Applicant has constructed dewatering trenches to allow for dry- mining and to reduce the evaporative losses associated with the operation. The water is pumped to settling ponds before being discharged to the Cache la Poudre River. SerFer Pit mining operations began in January 2011. Due to unfavorable economic conditions a precise end date is unknown. Once reclamation is complete, a Tined reservoir will be created and will have a total surface area of approximately 20 acres. The proposed replacement source is excess credits resulting from a recharge project at the Timnath - Connell Pit. Depletions It is estimated that 240,000 tons of aggregate will be mined during this approval period, resulting in 3.53 acre -feet of water lost in the mined product, and 4.00 acre -feet of water to be used for dust control. Gross evaporation at this site is estimated to be 40 inches per year with an effective precipitation amount of 0.88 feet. Ground water is exposed at this site in the 0.23 acre dewatering trench (3 ft wide x 3,340 ft long), the 0.05 acre dewatering sump, and two settling ponds of 0.14 and 0.16 acres. For the total of 0.58 acres of ground water exposed at this site, net evaporation is 1.50 acre -feet. The total consumptive use of ground water during the plan approval period is 9.03 acre -feet. (See attached Tables 1 and 2.) The lagged depletions from the SerFer Pit were estimated by the Applicant's consultant using the Alluvial Water Accounting System (AWAS) stream depletion model developed by the Integrated Decision Support Group with the following assumptions: P /' 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