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65- DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER RESOURCES Bill Ritter, Jr. Governor James B. Martin Executive Director December 18, 2009 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, 120th Estates Partners Sand and Gravel Mine (a.k.a. GSL Sand and Gravel Mine and 124th Estates Pit) (WDID 0202584) Section 35, T1 S, R67W, 6th P.M. - DMG # M-2001-085 (WDID 0203018) Water Division 1, Water District 2, Adams County Approval Period: September 1, 2009 through April 31, 2010 (December 31, 2010 if extended) Contact phone number for Mr. Jacob Bauer., 303-526-2600 Dear Mr. Bauer: We received your letter on August 31, 2009, requesting renewal of the above referenced substitute water supply plan ("SW SP"') to cover depletions caused by an existing gravel mining operation, In addition we have reviewed the amendment dated October 7, 2009. The required fee of $257.00 for the renewal of this substitute supply plan have been submitted (receipt no. 3642426). Plan Operation The mining plan includes a slurry wall around the perimeter of the site during mining. The slurry wall has been completed; however, tests have indicated that there is a leak in the liner. The owner of the 124th Estates Pit, is currently working to fix the slurry wail and anticipates that the slurry wall liner will be fixed and approved prior to April 30, 2010. The miring operations are anticipated to conclude in December 2009. This plan ?a?lii replace all lagged depletions to the river that result from the mining operations. Based on the SWSP request, all such depletions will accrue to the stream by December 31, 2010. All miring will be accomplished using a dry mining method. T he plan includes a dewatering trench with an exposed surface area of 2 acres. Other consumptive uses at the site include dust control and water removed in product. A portion of the water pumped from the dewatering trench will be discharged into the Henderson Water Ski Lake ("Ski Lake"), a reclaimed and unlined gravel pit. Evaporative losses from the Ski Lake are augmented under Division 1 Water Court case no. 82CW393. 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 to the Ski Lake. The Applicant anticipates that the Ski Lake will not have an adequate capacity to allow all of the dewatered water to be discharged to the Ski Lake. Therefore; a portion of the water purrlpe.a from the dewat?ring trench will also be delivered directly back to the stream. Office of the State Ena. nee~ 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-3581 • Fax: 303-866-3584 www. wa ter. sta te. co. us