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COLORADO <br /> 60 <br /> Division of Water Resources <br /> Department of Naturai Resources <br /> November 29, 2023 <br /> Greg Geras <br /> Asphalt Specialties Co. <br /> 10100 Dallas St <br /> Henderson CO 80640 <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 /> SWSP ID: 4830 <br /> Approval Period: November 1, 2023 through October 31, 2024 <br /> Contact Information for Mr. Greg Geras: 303-289-8555 and GregG@asphaltspecialties.com <br /> Dear Greg Geras: <br /> We have received the letter submitted on August 29, 2023, 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"). <br /> The required fee of $257.00 for the renewal of this substitute supply plan has been submitted <br /> (receipt no. 10031320). <br /> Plan Operation <br /> This plan seeks to replace depletions resulting from mining at the Nelson Mining Resource Gravel Pit <br /> ("Nelson Pit"). Mining at the site initially began in July 2006; however, due to the lack of demand <br /> for sand and gravel, the mining operation temporarily ceased and the dewatering pumps were shut <br /> down in June 2009. The mine area was subsequently allowed to fill with groundwater. This site has <br /> been put into Temporary Cessation with the Division of Reclamation, Mining, and Safety effective <br /> from August 16, 2011 through June 1, 2014. In June 2014 the pumps were turned on and the site <br /> was partially dewatered leaving approximately 7.25 acres of exposed ground water. The mining <br /> operation resumed production in July 2014. The exposed surface area in 2017 through the spring of <br /> 2018 was approximately 9.5 acres. In May and June of 2018, pumping of the groundwater reduced <br /> the exposed surface area to approximately 3.5 acres. Currently there are 3.88 acres exposed at the <br /> site in the dewatering trenches and three sedimentation ponds. Mining operations during the period <br /> of this SWSP will take place in the middle of Cell A. Cell B and C have been mined and backfilled <br /> (Figure 2). In addition during the period of this SWSP, the Applicant is proposing the construction of <br /> a new wash plant in the northern portion of Cell A to process aggregate mined at the site and a <br /> second sedimentation pond to settle out fines from the wash plant water as part of the recirculation <br /> process. <br /> During this SWSP period, depletions will consist of evaporation losses from the exposed ground <br /> water, dewatering, water lost with the mined product, and water used for dust control. The <br /> proposed reclamation of the site is a lined reservoir through the construction of a compacted clay <br /> liner around the mining area. <br /> Off'C01Q� <br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 www.colorado.gov/water I Lei <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Kevin G. Rein, State Engineer/Director y <br /> f 1876{` <br />