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411 STATE OF COLORADO OFFICE OF THE STATE ENGINEER Division of Water Resources Department of Natural Resources 1373 Sherman Street, Room 818 Denver, Colorado 80203 Phone (303) 866-3581 FAX (303) 666-3589 www.watecstete.m.us Mr. Peter Wayland Weiland, Inc. 10395 West Colfax, Suite 350 Lakewood Co 80215 December 10, 2004 Re: Substitute Water St~ly Plan, Farfrumwurkin, LLLP, File Pit II-M2004-0 7 Sections 31 & 32, T2N, R68W, 6th P.M. Water Division 1, Water District 6, Weld County Dear Mr. Wayland: pF'C Fe He a + • 1878 3 Bill Owens Governor Russell George Exerv8ve DireROr Hal D. Simpson, P.E. Stare Engineer The State Engineer's Office has completed a review of your November 10, 2004 request for renewal and amendment of the substitute water supply plan for the Farfrumwurkin, LLLP, File Pit II. The original plan was approved on November 10, 2003. The purpose for the amendment is to account for changes in depletions at the site. The required fee of $217 for the renewal substitute water supply plan has been submitted. According to the information provided, the File Pit I I site was designated as 111 c special permit that identified a pit area of approximately 13.4 acres. The site is being expanded under a new 112 permit, from-13.4-acresto __. _ . _ . _ _ The anticipated net depletion forthis plan is 19.38 acre-feet peryear. Mining atthe site is proposed to begin in January of 2005. There will be approximately 1.5 acres of water surface exposed after December 31, 1980 in the dewatering trenches and a sediment pond (0.5 acres in the dewatering trenches and 1-acre sediment pond). Dewatering trenches will be placed around the pit and pumped to facilitate dry mining.. Any. lagged stream depletions to Boulder Creek resulting from pumping of the dewatering trenches will be offset by placing the water collected from dewatering directly into a recharge well located approximately the same distance from the river as the dewatering trenches. The recharge well will utilize an existing well, located northeast of the proposed excavation. The existing well to be used for recharge must be permitted in accordance with Section § 37-92-602, C.R.S. as a monitoring well. Water may be discharged into this well only after obtaining all discharge permits and approvals as required by the Colorado Department of Public Health and Environment, and the Environmental Protection Agency. According to the information submitted, no water surface was exposed within the reclamation permit boundary prior to January 1, 1981. You have provided a monthly breakdown of the annual depletions at this site. There are 3.66 acre- feet ofevaporative loss,14.72 acre-feet of water lost with the mined product associated with the mining of up to 500,000 tons of aggregate and 1,00 acre-foot of water used for dust control. No phreatophyte credit has been applied to this plan. The proposed source of replacement forthis pit is 22.28 acre-feet offuily consumable waterleased from the City of Louisville and made available at its wastewater treatment plant. A 15 percent river transit loss is included in this amount. The monthly depletions and replacement requirements are found on the attached Table I.