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TCC's intent is to consistently maintain approximately 9.55 million gallons, or 29.3 acre -feet, of water in the 6MN <br />Reservoir, to supply the mine water system. As designed, the Reservoir has sufficient additional capacity to <br />provide buffer storage for another 1.0 million gallons, or 3.1 acre -feet, of emergency mine water storage to address <br />• any maintenance or emergency shut -downs of the pumping system, and 1.9 acre -feet (equivalent to the runoff from <br />a 100 -year, 24 -hour storm event) of runoff from the limited contributing watershed. At maximum water storage <br />level, taking into account the incremental storage capacities outlined (34.3 acre - feet), reservoir freeboard, at the <br />maximum pool level, will be approximately 0.5 feet to the invert of the open - channel spillway, and 2.6 feet to the <br />top of the embankment. Hydrologic design information for the 6MN Storage Reservoir is provided in Exhibit 8CC, <br />6MN Mine Water Storage Reservoir - Drainage Designs. The discharge pumping system for the 6MN Storage <br />Reservoir has been designed with the capacity to dewater the design storm -water storage volume in less than 12 <br />hours. Any discharge of stored mine or stormwater from the 6MN Storage Reservoir, will be directly to the mine <br />water system, with no discharge through the emergency spillway to natural drainage. While it will not be utilized <br />during normal operations or under design storm conditions, the open - channel spillway, and the lower portion of the <br />• <br />• <br />TRIO-73 2.05- 45.13a 05/21/10 <br />