2023-06-22_HYDROLOGY - M2014043 - Laserfiche WebLink

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Frei Hatchery SWSP Amendment St Renewal 2023-2024 (-2025 or -2026 if extended) Page 3 of 6 June 22, 2023 north before discharging into the South Platte River. Therefore lagged depletions are modeled from the centroid of the pit to the Bull Seep. A Glover analysis was used to determine the lagged depletions from dewatering, evaporation and operational losses to the Bull Seep. The aquifer characteristics used in the model for the exposed surface area, dewatering and the water lost with the mined product are: transmissivity (T) = 87,000 gallons per day per foot, specific yield (SY) = 0.2, the distance from the centroid of the exposed groundwater to the stream (X) was estimated to be 350 feet, and the location of the parallel impermeable boundary (W) was estimated to be 12,900 feet from the stream. The total lagged depletions from evaporation, water lost with the mined product, dust control and dewatering are projected to be 50.43 acre-feet for this approval period and are shown on attached Table 1. Replacements Out-of-priority depletions associated with the mining operation at this site will be replaced using fully consumable municipal return flows leased from the City of Aurora ("Aurora"). The current lease with Aurora dated June 4, 2021 and extension letter dated June 20, 2023 covers depletions through December 2024. A lease extension through December 2025 or December 2026 must be provided to this office in order for this SWSP to be operated after December 2024 in accordance with Condition No. 1 below. Under the lease, water will be delivered to the outfall of the Robert W. Hite Treatment Facility (aka Metro Sewer, WDID 0200700) located on the South Platte River. Aurora may alternatively deliver water at other points along a reach of the South Platte River beginning at or below the Hite Treatment Facility and continuing downstream to a point at or above the location where the South Platte River crosses the East 104th Avenue. The Applicant must notify the Water Commissioner at least 48 hours prior to making replacement deliveries at a location other than the Hite Treatment Facility. The lease delivery schedule is shown with the attached extension letter. The Hite Treatment Facility is located approximately 6.8 miles upstream of the Frei Hatchery Pit site. The delivery schedule includes a transit loss of 0.5% per mile (3.4% for 6.8 miles) during the months of April through October and 0.25% per mile (1.7% for 6.8 miles) during the months of November through March. Conveyance loss for delivery of augmentation water to the South Platte River is subject to assessment and modification as determined by the Division Engineer. Any changes to the assessed conveyance loss will be communicated to the Division One Call List via email. A summary of consumptive uses, lagged depletions, and replacement water are provided on Table 1. Conditions of Approval I hereby approve the proposed SWSP amendment in accordance with section 37-90-137(11), C.R.S. subject to the following conditions: 1. This SWSP is approved with the effective date of June 22, 2023 and shall be valid through December 31, 2024 unless otherwise revoked or superseded by decree. The plan can be extended through December 31, 2025 or December 31, 2026 if the Applicant provides a copy of the lease extension with the City of Aurora to this office by October 1, 2025 or October 1, 2026 that includes adequate replacement water to replace depletions, after accounting for any transit losses. If this plan is not decreed in water court by the SWSP expiration date, a renewal request must be submitted to this office with the statutory fee of $257 no later than October 1, 2024 (or October 1, 2025 or October 1, 2026 if extended). 2. Well permit no. 82163-F, was obtained for the current use and exposed pond surface area at the Frei Hatchery Pit in accordance with section 37-90-137(2) and (11), C.R.S., and this permit remains valid.