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Peter Wayland <br />Weiland, Inc <br />P.O. Box 18087 <br />Boulder, CO 80308 <br />DEPARTMENT OF NATURAL RESOURCES <br />DIVISION OF WATER RESOURCES <br />January 9, 2013 <br />AA AC-- <br />RECEIVED <br />JAN 152013 <br />Division of Reclamation, <br />tL�;irirs� & Safety <br />Mike King <br />Executive Director <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, 6 P.M. <br />Water Division 1, Water District 6, Boulder County <br />Dick Wolfe, P.E. <br />Director /State Engineer <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 />John W. Hickenlooper <br />Governor <br />Approval Period: January 1, 2013 through December 31, 2014 <br />Contact phone number for Mr. Wayland: 303 - 443 -9521 <br />Dear Mr. Wayland: <br />We have reviewed your letters dated May 8, 2012 and December 19, 2012 requesting a <br />substitute water supply plan ( "SWSP ") in accordance with § 37 -90- 137(11), C.R.S., to cover <br />depletions caused by mining operations at the Goose Haven Reservoir #2 Complex Expansion Pit <br />operated by Rock Products of Colorado, LLC ( "RPC" or "Applicant ") along Boulder Creek. This is <br />a new plan and the required fee of $1,593 for the SWSP has been submitted (receipt number <br />3655374). <br />Plan Operation <br />This SWSP covers depletions caused by gravel mining operations at the Goose Haven <br />Reservoir #2 Expansion Pit. Mining operations are projected to occur in two phases but this <br />SWSP approval only covers Phase I which will occur in 2013 and 2014. The SWSP will be <br />amended or renewed prior to Phase II commencement. Depletions to occur during this <br />approval period include evaporative losses from exposed groundwater and operational losses <br />including water lost in mined product and dust control. Replacement water will be supplied by <br />Lafayette using fully 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 projects to expose 0.15 acres of groundwater <br />within a sediment pond January 2013 through May 2013 and then expand the sediment ponds <br />so that 0.75 acres are exposed June 2013 through December 2014. The sediment ponds along <br />with the dewatering trenches will result in an evaporative Toss of 1.988 acre -feet in 2013 and <br />2.605 acre -feet in 2014. <br />The Applicant has estimated that 3.75 acre -feet per year of groundwater will be used for <br />dust suppression at the site. Mining is expected to occur starting in June 2013 with a total of <br />