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 25 of 37 use leased water from Martin Marietta if a supplemental source of replacement water is needed. Platte River Power Authority Lease Holcim has previously utilized leased water from the Platte River Power Authority ("PRPA") as a replacement source in this SWSP. For this SWSP period, the use of leased water from the PRPA is not necessary and is not proposed to be utilized. In the future, Holcim may use leased water from the PRPA if a supplemental source of replacement water is needed. Silver Heights Lease Holcim seeks the flexibility to use water from this source when needed. The Applicant must be able to account for and deliver Plum Creek water, including proper accounting and tracking in the Chatfield Reservoir Daily accounting; augmentation station releases, transit loss, etc. Use of Excess Credits The Applicant has proposed to use excess replacement credit associated with their approved replacement sources in other gravel pit SWSPs approved pursuant to section 37-90-137(11 ), C.R.S. or temporary SWSPs approved pursuant to section 37-92-308(5), C.R.S., to the extent such excess replacement credit exists. The Applicant must provide written notice to the Division Engineer and Water Commissioner at least 30 days in advance of the desired commencement of use of the excess replacement credits, which must include the specific plan in which the credits will be used, the provision in the plan that allows an unnamed source to be added for credit, the annual and monthly amount of excess replacement credit available, the location at which the water will be delivered to the stream, and a copy of a lease agreement between the Applicant and the purchaser of the excess replacement credits if the additional plan is not owned by the Applicant. The Applicant cannot claim credit for the use of the excess replacement credits in any other plan until they have received written approval from the Division Engineer or Water Commissioner. Dewatering All sites that are actively dewatering have been equipped with a Totalizing Flow Meter ("TFM") to measure the dewatering discharge. Monthly dewatering volumes must be recorded monthly with the meter readings included on submitted accounting. As long as dewatering operations remain continual at constant rates the net accretions are assumed to offset any lagged depletions. Under this assumption, the Applicant is not claiming any dewatering credit. Once dewatering operations stop, or are significantly reduced, at specific sites the monthly meter readings will be used to analyze post pumping depletions. The sites that will be actively dewatered during this SWSP period are the W.W. Farms Pit, Tull Pit,