2025-09-18_HYDROLOGY - M1999034 - Laserfiche WebLink

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Holcim South Platte Combined SWSP September 18, 2025 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 17 of 37 South Platte Mainstem Projected Replacement Sources 2025 Yield Comments (acre-feet) Centennial 30.00 Perpetual lease Available throughout the year-perpetual Westminster 1998 265.24 lease; 265.24 acre-feet proposed to be used in 2025 City of Aurora 158 Annual lease with City of Aurora Thornton Effluent 10.53 November - March only Fulton Ditch 106.06 96 shares total; 84 shares to be used in 2025 City of Arvada 66.00 Lease July - September only Patterson Ditch 31.87 8 shares to be used in 2025 Denver Julesburg Water 7.00 Lease recharge credits from 12CW179 Resources Partners, LLC Note: Projected 2025 yields may vary from previous estimates of the net yield due to the computed return flow obligations based on the previous year's actual water deliveries. Centennial Lease Holcim conveyed water rights in exchange for a perpetual lease of augmentation water in an agreement with Centennial Water and Sanitation District in 1996. The agreement requires Centennial to provide Holcim with 30 acre-feet of fully consumable water each year. The rate of delivery for the 30 acre-feet cannot exceed 0.5 cfs, but can be taken at any time throughout the year. For this plan period, Holcim intends to utilize this source during the month of January. A copy of a letter confirming Centennial's intent to follow the proposed schedule dated December 9, 2024 is attached. Holcim will not claim credit from Centennial releases on days when the Burlington Ditch is sweeping the river. The Applicant is working on ways to bypass the Centennial credits past the Burlington Ditch for future SWSP approvals. Westminster 1998 Lease The 1998 effluent lease with the City of Westminster is a perpetual lease that provides 0.28