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Morton Lakes Substitute Water Supply Plan Renewal (Amended) <br /> July 21, 2025 <br /> Page 9 of 17 <br /> • Distance from centroid of the Stage 6B mining area to the Big Dry Creek = 1,724 feet <br /> • Distance from centroid of the Stage 6D mining area to South Platte River = 643 feet <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 /> 0 7,250 feet for Stage 1 and 2 <br /> 0 1,395 feet for Stage 5 <br /> 0 8,557 feet for Stage 6A <br /> 0 8,680 feet for Stage 6B <br /> 0 9,164 feet for Stage 6D <br /> 0 6,978 feet for Stage 7A <br /> 0 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 for this amended plan <br /> period are 110.17 acre-feet as shown in Table 2, Column 8. For purposes of this SWSP, <br /> depletions are assumed to accrue to a point on the South Platte River located 1,885 feet <br /> from the West Section line and 1,600 feet from the South Section line in Section 6, Township <br /> 1 North, Range 66 West, 6th 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 updated lease <br /> extension agreement with Aurora on June 30, 2025 for an additional 34 acre-feet of <br /> replacement water, and a copy of the lease is attached to this letter. Water leased from <br /> Aurora would be released from the Robert W. Hite Treatment Facility (a.k.a. Metro <br />