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C DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER RESOURCES July 29, 2015 Mr. Paul Bruss Bishop -Brogden Associates, Inc. 333 West Hampden Ave., Ste 1050 Englewood, CO 80110 RE: Transit Mix Concrete Co. (Grisenti Farms) Pit DRMS File No. M-2001-005 Sec. 13, Twp. 19S, Rng. 69W, 6th P.M. Water Division 2, Water District 12 SWSP ID 4625, Group 1207856 Approval Period: February 1, 2015 — January 31, 2017 Contact Phone Number for Mr. Bruss: 303-806-8952 Dear Mr. Bruss: John W. Hickenlooper Governor Mike King Executive Director Dick Wolfe, P.E. Director/State Engineer RECEIVED JUL 3 0 2015 DIVISION OF RECLAMATION MINING AND SAFETY We have reviewed your November 10, 2014 renewal request for a substitute water supply plan ("SWSP" or "plan"), in accordance with § 37-90-137(11) C.R.S., for a gravel pit to be operated by Transit Mix Concrete Company ("Transit Mix" or "Applicant"). The gravel pit is permitted with the Division of Reclamation, Mining, and Safety ("DRMS") under File No. M-2001-005, and is permitted with the Division of Water Resources under Well Permit No. 61403-F. A gravel pit (well permit) application has been submitted to expand the use of the pit, receipt no. 3667398. The required $257 fee for the SWSP renewal request has been received (receipt no. 3667372). SWSP OPERATION Transit Mix has a lease agreement with the Grisenti family to mine sand and gravel from about 100 acres of land along the Arkansas River east of Florence. The mining operation is divided into two phases. Phase 1 involved the mining of approximately 35 acres located east of Highway 115 and west of Brush Hollow Creek. Phase 1 has been completed and serves as both a settling pond and water recharge pond for Phase 2 operations. The Phase 1 pit was filled with water by an administrative exchange during December 2009 resulting in a 23.3 acre pond whose surface is in equilibrium with the water table. The attached Figure 1 shows the project phases. DEPLETIONS The depletions of this operation for the 2015 plan year (February 1, 2015 — January 31, 2016) consist of 112.59 acre-feet of net evaporative loss from the exposed ground water, 14.71 acre-feet of water removed via 500,000 tons of mined product (4% loss by weight), and 6.0 acre- feet pumped for dust suppression. The current area of exposed ground water is approximately 32 acres (consisting of a 25.2 acre pond in Phase 1, a 1.6 acre fresh water supply pond in Phase 2, and a 5.0 acre pond in Phase 2 that only exists when mining ceases and the dewatering pump is shut off). The area of exposed ground water from February 1, 2015 — January 31, 2016 is projected to be a maximum of 37.1 acres (32.1 acres plus an additional 5 acres). The depletions from this operation for the 2016 plan year (February 1, 2016 — January 31, 2017) consist of 127.77 Office of the State Engineer 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-3581 • Fax: 303-866-3589 wwwmater.state.co.us