2021-06-01_HYDROLOGY - M1994027 - Laserfiche WebLink

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Aggregate Industries South Platte Combined SWSP June 1, 2021 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, Et 6090 Page 15 of 23 determining the actual historical consumptive use of the shares. Leggett-Owens Reservoir Prior to use of these shares as a replacement source, the Applicant must provide a full historical consumptive use analysis for the subject shares. Lupton Bottom Seep Ditches No. 1 and No. 2 Prior to use of these shares as a replacement source, the Applicant must provide a full historical consumptive use analysis for the subject shares. Martin Marietta Lease Aggregate has previously utilized water from Martin Marietta Materials, Inc. as a replacement source in this SWSP. For this SWSP period, the use of leased water from Martin Marietta Materials, Inc. is not necessary and is not proposed to be utilized. In the future, Aggregate may use leased water from Martin Marietta if a supplemental source of replacement water is needed. Platte River Power Authority Lease Aggregate 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, Aggregate may use leased water from the PRPA if a supplemental source of replacement water is needed. Silver Heights Lease Aggregate seeks the flexibility to use water from this source when needed. 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. Smith Et Emmons Ditch Aggregate owns 1.5 of 8 total outstanding shares in the Smith Et Emmons Ditch Company. The 1.5 Smith Et Emmons Ditch shares were historically used to irrigate 68 acres of pasture grass. Using a Blaney-Criddle analysis the potential crop consumptive use for the 68 acres was determined to be 108.7 acre-feet. Assuming a 10% ditch loss and 55% farm efficiency the dry-year consumptive use was determined to be 91.65 acre-feet for the 1.5 shares. The Applicant will install a return structure to measure Smith Et Emmons Ditch deliveries associated with the subject shares back to the stream prior to claiming use of this source. The applicant may not utilize the 1.5 shares of Smith Et Emmons 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. 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 Et Turner Ditch as a replacement source, the Applicant must provide a revised historical consumptive use analysis for