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COLORADO <br /> WDivision of Water Resources <br /> Department of Natural Resources <br /> September 18, 2025 <br /> Jared Dains, P.E. <br /> Applegate Group, Inc. <br /> 1490 West 1215t Avenue, Suite 100 <br /> Denver, CO 80234 <br /> Re: Amended Holcim South Platte Combined Substitute Water Supply Plan (WDID <br /> 0202565) <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, <br /> 5829, and 6243 <br /> Water Division 1, Water Districts 2, 3, 5 and 6, Weld, Boulder, and Adams Counties <br /> Approval Period: January 1, 2025 through December 31, 2025 <br /> Contact information for Mr. Dains: 303-452-6611; jareddains@applegategroup.com <br /> Dear Mr. Dains: <br /> We have reviewed your letter dated May 7, 2025 requesting an amendment to the substitute <br /> water supply plan ("SWSP") previously approved in accordance with 5 37-90-137(11), C.R.S., <br /> on April 14, 2025 to cover depletions caused by gravel mining operations at multiple mine <br /> sites operated by Holcim - WCR, Inc. ("Holcim" or "Applicant", formerly known as Aggregate <br /> Industries - WCR, Inc.) along the South Platte River mainstem, Lower Poudre River (Timnath <br /> Reservoir inlet to the confluence with the South Platte River) and St. Vrain River. This <br /> amendment is requested in order to allow for a revised surface area of groundwater <br /> exposure related to mining operations conducted and a revision to the dewatering <br /> operations at the Wattenberg Pit. Additionally this amendment updates the estimated dust <br /> control requirements for the Tull Pit. The required fee of $257 for the one pit being <br /> amended was submitted (receipt no. 10042662). This Amended SWSP supersedes and <br /> replaces the SWSP approval issued on April 14, 2025 in its entirety. <br /> Table A - Pit Overview <br /> Stream DRMS Current New Exposed <br /> Site Name Reach Permit No. WDID Well Permit Surface Area <br /> Permit No. Required (acres) <br /> Jeronimus Pit South M-1999-034a 020302 63281-F No 4.5b <br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 https://dwr.colorAdo.iRov �4 OF Colo, <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Jason T. Ullmann, State Engineer/ Yector�e� 0 <br /> *1876�` <br />