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�/© COLORADO <br /> icsDivision of Water Resources <br /> ® Department of Natural Resources <br /> June 27, 2022 <br /> Greg Geras <br /> Land Resource Manager <br /> Asphalt Specialties Co., Inc. <br /> 10100 Dallas Street <br /> Henderson, CO 80640 <br /> Re: Chavers Mining Resources Substitute Water Supply Plan (WDID 0202654) <br /> DRMS File No. M-2015-030 (0210488) <br /> E '/2 of the SW '/ of Section 18, Twp. 1 N, Rng. 66W of the 61h P.M. <br /> Water Division 1, Water Districts 2, Weld County <br /> SWSP ID: 5057 <br /> Approval Period: August 1, 2022 through December 31, 2022 (or July 31, 2023 subject to <br /> Condition No. 1) <br /> Contact Information for Greg Geras: 303-289-8555 and GregG@aspholtspecialties.com <br /> Dear Greg Geras: <br /> This letter is in response to your May 27, 2022 and amended June 1, 2022 substitute water supply plan <br /> ("SWSP") renewal request for a sand and gravel pit operated by Asphalt Specialties Co., Inc. ("Asphalt <br /> Specialties" or "Applicant") in accordance with section 37-90-137(11), C.R.S. The Applicant shall be <br /> responsible for compliance with this SWSP, but the State Engineer's Office ("SEO") may also pursue the <br /> landowner, for eventual compliance. The original plan was approved on August 3, 2016 and was most <br /> recently approved on July 1, 2021. The required fee of $257 for the SWSP has been paid (receipt no. <br /> 10021756). <br /> SWSP Operations <br /> The Chavers Mining Resources site is located in the E '/2 of the SW '/a, Section 18, Township 1 North, Range <br /> 66 West of the 6" P.M. (Figure 1, attached). The depletions that result from the mining operation over <br /> the period of this SWSP include evaporation from exposed groundwater, dust suppression, dewatering, <br /> concrete production, and water lost with the mined product. The life expectancy of the Chavers Mining <br /> Resources site is approximately 10 to 12 years, with 5 to 7 years remaining. Approximately 700,000 tons <br /> are to be excavated from the pit each year during mining operation. <br /> Mining operations will continue in Cell 3 and Cell 4. The site is actively being dewatered to facilitate dry <br /> mining. The dewatering water is discharged into a sedimentation pond to settle out fines and from there <br /> into another dewatering trench which discharges to the South Platte River as shown on attached Figure 2. <br /> There is also a concrete production plant on Cell 1 at the site which utilizes groundwater from the onsite <br /> alluvial well, permit no. 80120-F Fully consumable water from the City of Aurora will be used to replace <br /> depletions from the mining operation during this plan period. The proposed reclamation of the site is a <br /> lined reservoir through the construction of a compacted clay liner around the mining area. <br /> In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division of <br /> Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the <br /> requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the <br /> protection of water resources. The April 30, 2010 letter from DRMS requires that the Applicant <br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 www.cotorado.gov/water I <br /> �w cot— <br /> °F <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Kevin G. Rein, State Engineer/Director y o <br /> *ic <br /> *1876 <br />