2024-06-18_HYDROLOGY - M2019028 - Laserfiche WebLink

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Holcim South Platte Combined SWSP June 18, 2024 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 18 of 26 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. Zweck Et Turner Ditch The Applicant seeks to rely on a historical consumptive use analysis previously submitted in support of the SWSP request for the Fredstrom Pit and included in the 2020 SWSP request, dated May 29, 2018. The historical consumptive use analysis was accepted for the Fredstrom Pit SWSP for the purpose of demonstrating that the yield from the subject shares was expected to be sufficient to offset evaporative depletions from the Fredstrom Pit. The historical consumptive use analysis did not include evidence that the actual field efficiency (based on historical management and system properties) achieved the assumed maximum irrigation efficiency of 60% assumed in the report, and is therefore not acceptable. Prior to the use of the Applicant's interest in the Zweck &t Turner Ditch as a replacement source, the Applicant must provide a revised historical consumptive use analysis for the ditch that either uses an assumed maximum irrigation efficiency of 50% or a maximum irrigation efficiency that considers the site-specific potential efficiency and the effects of installation, management and maintenance of the irrigation system on the potential irrigation efficiency. In addition, the SWSP request must clearly define how the maximum irrigation efficiency was determined, including all assumptions and calculations. Furthermore, Holcim is in the process of developing an augmentation station for the Zweck &t Turner Ditch. The Applicant may not use the Zweck &t Turner Ditch as a replacement source in this SWSP until such time as all required measurement and bypass structures have been installed and approved by the water commissioner. 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. For this plan period the Applicant requests the ability to lease excess replacement credits for use as a replacement source in the Stillwater Ski Lake SWSP (Plan ID 6024, WDID 0202850) requested pursuant to section 37-92-308(5), C.R.S.