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Ready Mix Concrete Substitute Water Supply Plan <br /> February 13, 2020 <br /> Page 5 of 10 <br /> The IDS AWAS stream depletion model was used to determine the lagged depletions from <br /> dewatering, evaporation and operational losses at the Morton-Holton Lakes site to Big Dry <br /> Creek and the South Platte River, using the following Glover parameters: <br /> • specific yield = 0.2 <br /> • transmissivity = 150,000 gpd/ft based upon pumping test data in Colorado Ground <br /> Water Circular No. 11 <br /> • distance from centroid of the Stage 1 mining area to Big Dry Creek = 300 feet <br /> • distance from centroid of the Stage 2 mining area to Big Dry Creek = 1,150 feet <br /> • distance from centroid of the Stage 6A mining area to the South Platte River = <br /> 1,360 feet <br /> • distance from centroid of the Stage 6B mining area to the South Platte River = <br /> 1,720 feet <br /> • distance from centroid of the Stage 4 mining area to South Platte River = 1,000 <br /> feet <br /> • distance from centroid of the Stage 6C/6D mining area to South Platte River = 640 <br /> feet <br /> • distance from centroid of the Stage 5 mining area to South Platte River = 318 feet <br /> • distance from Big Dry Creek to alluvial boundary = 7,250 feet for Stage 1 and 2, <br /> and 8,557 feet for Stage 6A, 8,680 feet for Stage 613, 8,400 feet for Stage 4, 9,160 <br /> feet for Stage 6C/6D and 1,395 feet for Stage 5 based upon CDSS South Platte River <br /> alluvial aquifer boundary mapping <br /> Based upon this analysis, 95 percent of the depletions accrue to the stream within 5 <br /> months for Stage 1, within 14 month for Stage 2, within 19 months for Stage 6A, within 22 <br /> months for Stage 613, within 16 month at Stage 4, within 12 months at Stage 6C/6D and <br /> within 2 months at Stage 5. Normalized lagged factors were developed to determine the <br /> timing of lagged depletions to the stream as summarized in the table below: <br />