2021-06-01_HYDROLOGY - M1977436 - 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, 8t 6090 Page 10 of 23 be made to St. Vrain Creek during the period of April through October 2021 pursuant to the attached delivery schedule. South Platte Mainstem Projected Replacement Sources 2021 Yield Comments acre-feet) Centennial 30.00 Perpetual lease Westminster 1998 265.24 Available throughout the year-perpetual lease; 265.24 acre-feet proposed to be used in 2021 Westminster Annual Lease 184.00 Annual lease with Westminster Thornton Effluent 10.53 November- March only Fulton Ditch 96.28 96 shares total; 62 to be used in 2021 Brighton Ditch 203.79 1.038 shares total Note: Projected 2021 yields may vary from previous estimates of the net yield due to the computed return flow obligations based on the previous year's actual water deliveries. Centennial Lease Aggregate conveyed water rights in exchange for a perpetual lease of augmentation water in an agreement with Centennial Water and Sanitation District in 1996. The agreement requires Centennial to provide Aggregate with 30 acre-feet of fully consumable water each year. The rate of delivery for the 30 acre-feet cannot exceed 0.5 cfs, but can be taken at any time throughout the year. For this plan period, Aggregate intends to utilize this source during the months of April and October. A copy of a letter confirming Centennial's intent to follow the proposed schedule dated December 30, 2020 is attached. Aggregate will not claim credit from Centennial releases on days when the Burlington Ditch is sweeping the river. The Applicant is working on ways to bypass the Centennial credits past the Burlington Ditch for future SWSP approvals. Westminster 1998 Lease The 1998 effluent lease with the City of Westminster is a perpetual lease that provides 0.28 cfs of fully consumable water every day of each year (averaging 16.89 acre-feet per month) and an additional 0.17 cfs every day from October 1 to June 30 during each year (averaging 10.25 acre-feet per month) at the outfall of the Metro Wastewater Treatment Plant. The lease provides 294.79 acre-feet annually, of which 265.24 acre-feet are anticipated to be utilized in this SWSP. (The remaining 29.55 acre-feet are reserved for use in case no. 2007CW198.) Westminster Annual Lease Pursuant to a March 4, 2010 Consumable Water Lease Agreement with the City of Westminster (amended January 14, 2020), Aggregate may lease up to 250 acre-feet of consumable water annually, with a minimum lease of 150 acre-feet per year unless changed by mutual agreement between the parties. The amended lease is valid through June 30, 2022. Deliveries under this lease are available from November 101h through March 201h from either the Metro Wastewater Treatment Plant or the Big Dry Creek Wastewater Treatment Plant. For 2021, Aggregate and Westminster have agreed to a total annual delivery amount of 184 acre-feet. A copy of the proposed 2021 delivery schedule, dated January 4, 2021, is attached. For this SWSP, transit losses were assessed assuming deliveries will be from the Big Dry Creek Wastewater Treatment Plant. Notice must be provided and approval made by the water commissioner at least 48 hours prior to the release of replacement water, or as required by the water commissioner, and must identify which source the replacement water will originate from (the Metro Wastewater Treatment Plant or the Big Dry Creek Wastewater Treatment Plant) to allow confirmation of release and that water was delivered.