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, Ft 6243 Page 10 of 37 DPG Pit 180,000 1,300 - Distel Pit 50,000 700 5,300 - Tull Pit 50,000 4,900 9,300 - Irwin-Thomas Pit 50,000 1,900 6,000 - W.W. Farms Pit 120,000 900 8,750 - F-Street Pit 120,000 2,600 5,000 - The consumptive use and lagged stream depletions from each site are summarized in the attached "South Platte Combined Substitute Supply Plan Accounting 2025" sheet. Replacements Lower Poudre River Projected Replacement Sources 2025 Yield Comments (acre-feet) Whitney Ditch 112.04 13.5 shares Greeley Irrigation Company 33.33 Lease of 3 shares Bucklen Pit 70.70 Annual lease of excess augmentation credit City of Greeley 36 Lease Note: Projected 2025 yield may vary from previous estimates of net yields due to the computed return flow obligations based on the previous year's actual water deliveries. Whitney Ditch Holcim owns a total of 13.5 shares in the Whitney Ditch Company. The subject 13.5 shares were changed in case no. 1990CW23 from irrigation use to industrial mining, dust suppression, reclamation, irrigation, augmentation under the plan for augmentation described in the decree, and piscatorial purposes. The use of the subject shares for replacement purposes in this SWSP was not decreed in case no. 1990CW23; however, the Applicant has proposed to use the subject shares for replacement purposes pursuant to this SWSP in conformity with the requirements of case no. 1990CW23. The decree entered in case no. 1990CW23 relied on a ditch-wide analysis of the Whitney Ditch developed for and decreed in case no. 2008CW65. Based on a study period of 1950