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Holcim South Platte Combined SWSP April 14, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, Ft 6243 Page 18 of 37 <br /> Note: Projected 2025 yields may vary from previous estimates of the net yield due to the <br /> computed return flow 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 <br /> Centennial to provide Holcim with 30 acre-feet of fully consumable water each year. The <br /> rate of delivery for the 30 acre-feet cannot exceed 0.5 cfs, but can be taken at any time <br /> throughout the year. For this plan period, Holcim intends to utilize this source during the <br /> month of January. A copy of a letter confirming Centennial's intent to follow the proposed <br /> schedule dated December 9, 2024 is attached. Holcim will not claim credit from Centennial <br /> releases on days when the Burlington Ditch is sweeping the river. The Applicant is working on <br /> ways to bypass the Centennial credits past the Burlington Ditch 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) <br /> and an additional 0.17 cfs every day from October 1 to June 30 during each year (averaging <br /> 10.25 acre-feet per month) at the outfall of the Metro Wastewater Treatment Plant. The <br /> lease provides 294.79 acre-feet annually, of which 265.24 acre-feet are anticipated to be <br /> utilized in this SWSR (The remaining 29.55 acre-feet are reserved for use in case no. <br /> 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 <br /> Ranch LLC. The original term of the lease was from December 1, 2021 through November 30, <br /> 2022 with the allowance for one-year extensions through November 30, 2027. A copy of a <br /> letter confirming the City of Aurora's agreement to extend the lease for January 1, 2025 <br /> through December 31, 2025 is attached. The letter confirms the City of Aurora's intent to <br /> provide 158 acre-feet of reusable raw water from January 1, 2025 through December 31, <br /> 2025. <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 <br /> alternatively deliver water at other points along a reach of the South Platte River beginning <br /> at or below the Hite Treatment Facility extending downstream to a point at or above the <br /> Lupton Bottom Ditch headgate. The point of depletion is downstream of the Lupton Bottom <br />