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-~~ D S ~~ STATE OF COLORADO OFFICE OF THE STATE ENGINEER Division of Water Resources Department of Natural Rewurces 1313 Sherman Street, Room 818 Denver, Colorado 80203 Phone (303) 866-3581 FAX (303) 866-3589 www.waterstate.co.us Donald E. Frick Applegate Group, Inc. l 1499 West 120`" Avenue, Suite 200 Denver CO 80234-2728 November 28, 2005 ~i Re: Perry Pit Substitute Water Suooly Plan, M-90-098 Section 25, TIN R67W, 6`h P.M. Water Division 1, Water District 2 ~~~~L ~'~ ~EC 0 51005 9irision of Minerels and Gealo9Y He , ~~ ~ c~~ .. ~ IB96 ~` Bill Owens Governor Russell George Fxecu[ive Director Hal D. Simpson, P.E. State Engineer Approval Period: January 1, 2006 through December 31, 2006 Dear Mr. Frick: We have received your request of November 14, 2005 and payment of $217 (receipt no. 545837) for the renewal of the referenced substitute water supply plan that expires December 31, 2005. Depletions Asphalt Paving has recently completed lining of the Perry Pit site with a slurry wall and is currently dewatering the site to begin the 90-day test. During the 90-day test the site will remain dewatered and there will be no exposed surface area. Assuming the liner is approved, there will be no exposed surface area in 2006. Since mining commenced at the site in 1998 there has been a variable amount of exposed lake surface that increases from 6.6 acres in April 1998 to 14 acres in December 2005. The entire lake surface was first exposed after December 31, 1980. Consumptive use of water at the property consists of evaporation from the pond surface area and water lost in product as shown in the attached table entitled Glover Analysis Input. No water is needed for dust suppression associated with the wet mining operation. The delayed impacts to the river are determined using a Stream Depletion Factor of 30 days. Replacements Replacement water consists of recharge credits and water leased from Consolidated Mutual Water Company (Consolidated) and the St. Vrain Left Hand Water Conservancy District (Left Hand). The recharge ponds, or sumps, were used to recharge water during 1998 and 1999 using water diverted when there was no call on the river. The accretions to the river that resulted from the recharge were calculated using a Stream Depletion Factor of 280 days. Those accretions are shown in the attached table entitled Stream Depletion Analysis Using Stream Depletion Factors, dated November 14, 2005. Water leased from Consolidated, in the amount of 7.32 acre-feet, will be used to replace depletions during the months of April 2006 through October 2006. Of the 7.32 acre-feet of lease water from Consolidated, approximately 0.64 acre-feet will cover transit losses (9.5% based on 0.5% per mile for 19 miles). Water leased from Left Hand, in the amount of 4.97 acre-feet, wil! be used to replace depletions during the months of January 2006 through March 2006 and November 2006 through December 2006.