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DEPARTMENT OF NATURAL RESOURCES <br />DIVISION OF WATER RESOURCES <br />F�ob Laird <br />Asphalt Specialties Co. <br />10100 Dallas St <br />Henderson CO 80640 <br />November 12, 2013 <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Dick Wolfe, P.E. <br />Director /State Engineer <br />Re: Nelson Mining Resource Substitute Water Supply Plan (WDID 0502527) <br />Nelson Mining Resource Gravel Pit, DRMS Permit No. M- 2005;059 (WDID 0503011) <br />Section 31, T3N, R67W of the 6th P.M. <br />Water Division 1, Water District 5, Weld County <br />Approval Period: November 1, 2013 through October 31, 2014 RECEIVED <br />Contact Phone Number for Mr. Rob Laird: 303 - 289 -8555 <br />Contact Phone Number for Mr. Peter Wayland: 303 - 823 -0951 i, 0V 19 ?0 r 11 <br />Dear Mr. Laird: DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />We have received your letter dated September 11, 2013, requesting renewal of the above <br />referenced substitute water supply plan ( "SWSP ") in accordance with § 37 -90- 137(11), C.R.S. This <br />SWSP is requested to cover depletions caused by the Nelson Mining Resource Gravel Pit sand and <br />gravel mining operation, owned and operated by Asphalt Specialties Company, Inc. ( "Applicant'). The <br />required fee of $257.00 for the renewal of this substitute supply plan has been submitted (receipt no. <br />3661756). <br />Plan Operation <br />This plan seeks to replace depletions resulting from mining at the Nelson Mining Resource <br />Gravel Pit ( "Nelson Pit'). Mining at the site initially began in July 2006; however, due to the lack of <br />demand for sand and gravel, the mining operation temporarily ceased and the dewatering pumps were <br />shut down in June 2009. The mine area was subsequently allowed to fill with ground water. This site <br />has been put into Temporary Cessation with the Division of Reclamation, Mining, and Safety effective <br />from August 16, 2011 through February 1, 2014. It is anticipated that the mining operation will resume <br />production once there is again a demand for sand and gravel on the local market. During this SWSP <br />period, depletions will consist of evaporation losses from the exposed ground water in the partially <br />mined site. <br />Depletions <br />Evaporative losses were calculated based on the maximum exposed surface area of 12.60 <br />acres. Net evaporative depletions were calculated using a gross annual evaporation of 39 inches from <br />the exposed water surface, with a credit of 9.73 inches for effective precipitation (based on an average <br />annual precipitation of 13.88 inches for the Longmont 2 ESE weather station). Net evaporative losses <br />at the site are estimated to total 30.75 acre -feet for this plan period. <br />The IDS Alluvial Water Accounting System (AWAS) analytical stream depletion model, which <br />uses the Glover method, was used to calculate the lagged depletions to St. Wain Creek. You have <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 />