2023-02-24_HYDROLOGY - M2004009 (2)

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n COLORADO dDivision of Water Resources Department of Natural Resources February 24, 2023 Greg Geras, Land Resource Manager Asphalt Specialties Co. 10100 Dallas St Henderson, CO 80640 Re: Turnpike Mining Resource Substitute Water Supply Plan (WDID 0602547) DRMS File No. M-2004-009 (0603016) Part of Section 31, Twp. 2N, Rng. 68W, 6th P.M., Weld County Water Division 1, Water District 6 SWSP ID: 4644 Approval Period: January 1, 2023 through December 31, 2023 Contact Information for Greg Geras: 303-289-8555 and GreQG@asphaltspecialties.com Dear Greg Geras: This letter is in response to the November 1, 2022 renewal request for the above-referenced substitute water supply plan ("SWSP") for a sand and gravel pit operated by Asphalt Specialties Co., Inc. ("ASCI" or "Applicant") in accordance with section 37-90-137(11), C.R.S. The required fee of $257.00 for the renewal of this substitute supply plan ("SWSP") has been submitted (receipt no. 10025266). This plan was originally approved in 2006 and was most recently approved on April 5, 2022. SWSP Operations This plan seeks to replace depletions resulting from mining at the Turnpike Mining Resource Gravel Pit ("Turnpike Pit"). The site is located in Section 31, Township 2 North, Range 68 West, 61h P.M. at 599 Highway 52. Sand and gravel extraction has ceased at the site as of October 2022. No sand and gravel extraction is anticipated during 2023. Cell 1 has been reclaimed and been released from bonding as a reservoir. Cells 2 through 6 are currently being reclaimed to return the site to agricultural use and are bonded to cover reclamation activities. ASCI will use the dewatering trenches around the perimeter of the toe of the mining slope to facilitate backfill activities which are anticipated to continue for up to 5 years. Water is directed into a pump basin to settle out fines where it is then pumped via an enclosed pipe for discharge directly to Boulder Creek. A 2-acre wash pond (Cell 2A) and a 2-acre settling pond (Cell 213) expose groundwater at the site. Projected depletions at the site consist of evaporative depletions, dust control, dewatering, and lagged depletions from past mining activities. The proposed replacement of depletions for this site will come from a lease of fully consumable water from the City of Louisville ("City") and dewatering credits. In accordance with the letter dated April 30, 2010 (attached) from the Colorado Division of Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of water resources. The April 30, 2010 letter from DRMS requires that you provide information to DRMS to demonstrate you can replace long-term injurious stream depletions that result from mining related exposure of groundwater. The DRMS letter identifies four approaches to satisfy this requirement. ��OF COl0 Oil Sherman Street, DOOM V'r Derrurrr, LU M0261 E 105 .864-1581 www-co14rad4-ugw1water �e� � 0 Jared$. ftils,Governor I Don Gibbs, Executive Direct-or I Kevin G. Rein, state EngincerlDirector I * * *1876*