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DEPARTMENT OF NATURAL RESOURCES Ji 2 DIVISION OF WATER RESOURCES John W. Hickenlooper Governor April 25, 2011 Mike King Executive Director Dick Wolfe, P.E. Director/State Engineer Mr. Jacob Bauer Martin and Wood Water Consultants, Inc. 602 Park Point Drive, Suite 275 Golden, CO 80401 Re: Substitute Water Supply Plan GSL Sand and Gravel Mine (WDID 0202584) (a.k.a. 120 Estates Partners Sand and Gravel Mine and 124th Estates Pit) DRMS Permit No. 4-2001-085, WDID 0203018 Section 35, T1S, R67W, 6th P.M. Water Division 1, Water District 2, Adams County Approval Period: November 1, 2010 through October 31, 2011 RECEIVED Contact phone number for Mr. Jacob Bauer.- 303-526-2600 '1"IAY 112 oil Dear Mr. Bauer: division of K6c6 -otion, Mining and Safety We have reviewed your letter dated November 8, 2010 and subsequent correspondence most recently received April 25, 2011, requesting amendment and renewal of the above referenced substitute water supply plan ("SWSP") to cover depletions caused by an existing gravel mining operation in accordance with § 37-90-137(11), C.R.S.. The original plan was approved on May 20, 2002 and it was most recently approved in a letter dated December 18, 2009. The required fee of $257 for the renewal of this SWSP has been submitted (receipt number 3647959). Plan Operation It is estimated that 300,000 cubic yards (approximately 400,000 tons) of sand and gravel resource remain at the site. For the purposes of this SWSP, mining is projected to occur at a maximum rate of 45,000 tons/month from November 2010 through June 2011. All mining will be accomplished using a dry mining method. The mining plan originally included a rinse water lagoon, however the lagoon is no longer used and the only exposed ground water at the site during active mining is a dewatering trench with an exposed surface area of 1 acre. The dewateting trench extends from the interior of the gravel mine to the Henderson Water Ski Lake (WDID 0203313, "Ski Lake"), a reclaimed and unlined gravel pit. Evaporative losses from the Ski Lake are augmented under Division 1 Water Court case no. 82CW393 (WDID 0202511). According to the plan, based on site observations of the Ski Lake, no significant increase in evaporation will occur from the lake as a result of discharging water from the mine site to the Ski Lake. The water from the gravel mine is discharged through Brighton's 124th Avenue augmentation line to the South Platte River. Brighton has agreed to the continued use of the 124th Avenue augmentation line from November 1, 2010 through June 2011. Other consumptive uses at the site include dust control and water removed in the mined product, as well as evaporation of exposed ground water while the mine is inactive prior to IV, Office of the State Engineer 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-3581 • Fax: 303-866-3589 http://water.state.co.us