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04(TCC.OOlo` s DEPARTMENT OF NATURAL RESOURCES <br /> 74.‘7_,;='- .--- <br /> ° DIVISION OF WATER RESOURCES <br /> \�` John W.Hickenlooper <br /> � /876 `;' Governor <br /> Mike King <br /> February 1, 2016 Executive Director <br /> Dick Wolfe,P.E. <br /> RECEIVED Director/State Engineer <br /> Peter Wayland <br /> Weiland, Inc FEB 0 2 2016 <br /> P.O. Box 18087 <br /> Boulder, CO 80308 DIVISION OF RECLAMATION <br /> MINING&SAFETY <br /> Re: Goose Haven # 2 Expansion Substitute Water Supply Plan (WDID 0602537) <br /> Goose Haven # 2 Expansion Pit, DRMS Permit No. M-2010-071 (WDID 0603019) <br /> Sections 15, 21, 22, T1 N, R69W, 6th P.M. <br /> Water Division 1, Water District 6, Boulder County <br /> Approval Period: January 1, 2015 through December 31, 2016 <br /> Contact information for Mr. Wayland: 303-443-9521, pwavland(cr�weilandinc.corn <br /> Dear Mr. Wayland: <br /> We have reviewed your letter received August 8, 2014 requesting a substitute water supply <br /> plan ("SWSP") in accordance with § 37-90-137(11), C.R.S., to cover depletions caused by mining <br /> operations at the Goose Haven Reservoir#2 Complex Expansion Pit operated by Rock Products <br /> of Colorado, LLC ("RPC" or "Applicant") along Boulder Creek. This plan was first approved on <br /> January 9, 2013; this application is for the renewal of the plan and the required fee of $257 for <br /> the SWSP has been submitted (receipt number 3666019B). <br /> Plan Operation <br /> This SWSP covers depletions caused by gravel mining operations at the Goose Haven <br /> Reservoir #2 Expansion Pit which is located in Sections 15, 21 and 22 in Township 1 North, <br /> Range 69 West of the 6th P.M. Depletions to occur during this approval period include <br /> evaporative losses from exposed groundwater and operational losses including water lost in <br /> mined product and dust control. Replacement water will be supplied by Lafayette using fully <br /> consumable water from their waste water treatment plant. <br /> Depletions <br /> Evaporation and Mining Operations <br /> Net evaporative depletions are calculated using a gross annual evaporation of 41 inches <br /> per year per NOAA Technical Report NWS-33. This is reduced by applying a credit of 9.7 <br /> inches for effective precipitation which is 70% of the average annual precipitation based on <br /> Longmont 2 ESE (ID#055116) weather station. Groundwater will be exposed within dewatering <br /> trenches and the sediment ponds. The Applicant exposed 1.75 acre of groundwater within <br /> sediment ponds and dewatering trenches during 2015 and projects that they will expose 1.6 <br /> acres of groundwater during 2016. The sediment ponds along with the dewatering trenches <br /> resulted in an evaporative loss of 3.73 acre-feet in 2015 and will result in an evaporative loss of <br /> 3.92 acre-feet in 2016. <br /> The Applicant used approximately 0.17 acre-feet of groundwater for dust suppression at <br /> the site in 2015 and has estimated that 3.75 acre-feet will be used in 2016. A total of 182,436 <br /> tons was mined in 2015 and 400,000 tons is anticipated to be mined in 2016. The mined <br /> Office of the State Engineer <br /> 1313 Sherman Street, Suite 818 •Denver,CO 80203 •Phone:303-866-3581 • Fax:303-866-3589 <br /> www.water.state.co.us <br />