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Holcim South Platte Combined SWSP June 18, 2024 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, F± 6243 Page 12 of 26 <br /> South Platte Mainstem <br /> Projected <br /> Replacement Sources 2024 Yield Comments <br /> acre-feet <br /> Centennial 30.00 Perpetual lease <br /> Westminster 1998 265.24 Available throughout the year-perpetual lease; <br /> 265.24 acre-feet proposed to be used in 2024 <br /> City of Aurora 164.00 Annual lease with City of Aurora <br /> Thornton Effluent 10.53 November - March only <br /> Fulton Ditch 114.20 96 shares total; 84 shares to be used in 2024 <br /> Brighton Ditch -23.94 Lagged return flow obligations from 1.038 shares <br /> City of Arvada 65.00 Lease Jul - October only <br /> Patterson Ditch 46.08 8 shares to be used in 2024 <br /> Central Colorado Water Conservancy 41.0 Lease <br /> District <br /> Note: Projected 2024 yields may vary from previous estimates of the net yield due to the computed return flow <br /> obligations based on the previous year's actual water deliveries. <br /> Centennial Lease <br /> Holcim conveyed water rights in exchange for a perpetual lease of augmentation water in an <br /> agreement with Centennial Water and Sanitation District in 1996. The agreement requires Centennial <br /> to provide Holcim with 30 acre-feet of fully consumable water each year. The rate of delivery for <br /> the 30 acre-feet cannot exceed 0.5 cfs, but can be taken at any time throughout the year. For this <br /> plan period, Holcim intends to utilize this source during the month of January. A copy of a letter <br /> confirming Centennial's intent to follow the proposed schedule dated December 15, 2023 is attached. <br /> Holcim will not claim credit from Centennial releases on days when the Burlington Ditch is sweeping <br /> the river. The Applicant is working on ways to bypass the Centennial credits past the Burlington Ditch <br /> for future SWSP approvals. <br /> Westminster 1998 Lease <br /> The 1998 effluent lease with the City of Westminster is a perpetual lease that provides 0.28 <br /> cfs of fully consumable water every day of each year (averaging 16.89 acre-feet per month) and an <br /> additional 0.17 cfs every day from October 1 to June 30 during each year (averaging 10.25 acre-feet <br /> per month) at the outfall of the Metro Wastewater Treatment Plant. The lease provides 294.79 <br /> acre-feet annually, of which 265.24 acre-feet are anticipated to be utilized in this SWSR (The <br /> remaining 29.55 acre-feet are reserved for use in case no. 2007CW198.) <br /> City of Aurora Lease <br /> The January 10, 2022 lease with the City of Aurora and Stillwater Lake Ranch LLC is an <br /> agreement that provides reusable raw water for Aggregate Industries and Stillwater Lake Ranch LLC. <br /> The original term of the lease was from December 1, 2021 through November 30, 2022 with the <br /> allowance for one-year extensions through November 30, 2027. A copy of a letter confirming the City <br /> of Aurora's agreement to extend the lease for January 1, 2024 through December 31, 2024 is <br /> attached. The letter confirms the City of Aurora's intent to provide 164 acre-feet of reusable raw <br /> water from January 1, 2024 through December 31, 2024. <br /> Under the lease, water will be delivered to the outfall of the Robert W. Hite Treatment <br /> Facility (aka Metro Sewer, WDID 0200700) located on the South Platte River. Aurora may alternatively <br /> deliver water at other points along a reach of the South Platte River beginning at or below the Hite <br />