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Morton Lakes Substitute Water Supply Plan Renewal <br /> January 10, 2025 <br /> Page 7 of 14 <br /> • Distance from centroid of the Stage 7A mining area to the Big Dry Creek = 665 feet <br /> • Distance from centroid of the Stage 7B mining area to Big Dry Creek = 173 feet <br /> • Distance from alluvial boundary (based upon CDSS South Platte River alluvial aquifer <br /> boundary mapping) <br /> o 7,250 feet for Stage 1 and 2 <br /> 0 1,395 feet for Stage 5 <br /> o 8,557 feet for Stage 6A <br /> o 8,680 feet for Stage 6B <br /> o 9,164 feet for Stage 6D <br /> o 6,978 feet for Stage 7A <br /> o 7,360 feet for Stage 7B <br /> Normalized lagged factors were developed to determine the timing of lagged depletions to <br /> the stream as summarized in the attached "Depletion Lagging Factors" Table. <br /> The total projected lagged depletions from mining operations are 182.90 acre-feet during <br /> 2025 as shown in Table 2, Column 8. For purposes of this SWSP, depletions are assumed to <br /> accrue to a point on the South Platte River located 1,885 feet from the West Section line <br /> and 1,600 feet from the South Section line in Section 6, Township 1 North, Range 66 West, <br /> 6t" P.M. <br /> Replacements <br /> The proposed source of replacement water for this SWSP is fully consumable water leased <br /> from the City of Aurora ("Aurora"). The Applicant provided a copy of the lease extension <br /> agreement with Aurora renewable through December 31, 2025 with the SWSP request, and a <br /> copy of the lease is attached to this letter. Water leased from Aurora would be released <br /> from the Robert W. Hite Treatment Facility (a.k.a. Metro Wastewater Treatment Plant <br /> (MWWTP)) (WDID 0200700) in the SW '/ of the SW '/ of Section 1, Township 3 South, Range <br /> 68 West of the 6t" P.M. A transit loss of 0.5% per mile is currently assessed from April <br /> through October and a transit loss of 0.25% per mile is currently assessed during November <br /> through March for delivery of water down the South Platte River. Such transit losses are <br /> subject to modification by the Division Engineer. The MWWTP is located approximately 25 <br />