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is U~~~ STATE OF COLORADO OFFICE OF THE STATE ENGINEER Division of Wafer Resources Department of Natural Resources 1313 Sherman Sheet, Room 818 Denver, Colorado 80203 Phone (3031 B66-3581 FAX (303) 866-3589 December 13, 2005 www.watecstate.co.us Melanie Lawrence Leonard Rice Consulting Water Engineers, Inc. 2000 Clay Street, Suite 300 Denver, Colorado 80211-5119 Re: S&H Mine Gravel Pit, Substitute Water Supply Plan DMG File No. M-2000-158 rr Section 35, T4N, R67W, 6'~ P.M. Water Division 1, Water District 2 Approval Period: January 1, 2006 through December 31, 2006 pF COQ i ,.r',e~~ ~ \~ • r ~ X876 ~ Bill Owens Governor Russell George Executive Director Hal D. Simpson, P.E. Sere Engineer RECEIVED SEC 2 2 2005 Division ~f Minerals and Geology Dear Ms. Lawrence: We have received your letter of November 30, 2005, requesting renewal of the above referenced substitute water supply plan to cover depletions caused by an existing gravel mining operation. The required fee of $217.00 for the renewal of this substitute supply plan has been submitted. The original supply plan was approved on April 30, 2001 and most recently renewed on November 23, 2004. Depletions This plan describes the actual uses for 2003, 2004, 2005 and the projected uses for 2006. According to the information submitted, no water surface was exposed within the permit boundary prior to January 1, 1981, Mining at the site may be done under wet conditions with a dredge directly exposing groundwater or under dry conditions by dewatering the pit area. The area of exposed groundwater specified in the plan assumes that the area will be mined under wet conditions. The anticipated consumptive use for 2006 cronsists of 31.71 acre-feet of evaporation loss from a maximum exposed area of 13.5 acres, 19.13 acre-feet lost in product (4% moisture of 650,000 tons of raw material) and 5.0 acre-feet of water used for dust control {total 55.84 acre- feet). The exposed pond area gradually increases from 7.23 acres in January 2006 to 13.5 acres in December 2006. See the table below for the area exposed monthly. The depletions were lagged to the stream using a Glover analysis and assuming a distance to the stream of 2,900 feet, distance to the impermeable boundary of 16,100 feet, permeability of 1,043 ft/day, saturated thickness of 20 feet and specific yield of 0.2. The Applicant has provided a monthly schedule of lagged actual depletions to the river system, together with a schedule of replacement requirements. This plan accounts for actual depletions determined to accrue to the steam system during this plan period.