2019-01-30_HYDROLOGY - M2004031 - Laserfiche WebLink

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Aggregate Industries South Platte Combined SWSP January 30, 2019 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 9 of 21 St. Vrain River Replacement Sources Projected 2019 Yield (acre-feet) Comments Martin Marietta lease 14.0 Annual lease Martin Marietta Lease Aggregate has entered into a water lease agreement with Martin Marietta Materials, Inc. for 14.0 acre-feet of fully consumable water stored in Heaton Reservoir (WDID 0504089). A copy of the lease agreement, dated December 19, 2018, is attached. Heaton Reservoir is part of the Hamm Pit (M-1987-176), and is located in the N½ of the NE¼ of Section 9, Township 2 North, Range 68 West, 6th P.M., adjacent to the confluence of Boulder Creek with St. Vrain Creek. There are no intervening water rights between the Distel and Tull Pits (upstream points of depletion) and the Heaton Reservoir (downstream point of release). The slurry wall liner for the Heaton Reservoir was approved as having been lined to the design standard referenced in the August 1999 State Engineer Guidelines for Lining Criteria for Gravel Pits in a letter dated April 7, 2003 and it is therefore classified as a lined reservoir. Deliveries from Heaton Reservoir will made be to Boulder Creek during the period of April through October 2019 pursuant to the attached delivery schedule. South Platte Mainstem Replacement Sources Projected 2019 Yield (acre-feet) Comments Centennial 30.00 Perpetual lease Westminster 1998 265.24 Available throughout the year-perpetual lease; 265.24 acre-feet proposed to be used in 2019 Westminster Annual Lease 146 Annual lease with Westminster Thornton Effluent 10.53 November – March only Fulton Ditch 110.97 96 shares total; 62 to be used in 2019 Brighton Ditch 209.96 1.038 shares total Note: Projected 2019 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, May, September, and October. 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