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• FRESHWATER POND N0. 3 <br />Freshwater Pond No. 3 is a partially incised pond designed to contain <br />approximately 3,000,000 gallons of water. The pond receives both that <br />water pumped from the Southfield mine workings and water for consumptive <br />use pumped from the Corley Mine Well. The water is stored in the pond <br />until it can be used in the mining and processing operations. Excess <br />dewatering flows are discharged into the Magpie Creek Diversion at NPDES <br />discharge point 003. Pond No. 3 is also lined with a synthetic hypalon <br />liner which extends beyond the pond's edges. The pond will not remain <br />after final reclamation. <br />Pond No. 3 functions as part of the water-use circuit which provides water <br />for the mining and coal preparation activities. Water is pumped from both <br />the Southfield Mine dewatering well and the Corley Mine Well in the <br />northeast portion of the permit area. The pumped water is routed via <br />pipeline to Pond No. 3. The water is discharged as required from Pond No. <br />3 to Water Treatment and Recycle Pond No. 2 as makeup water for the coal <br />preparation plant. Any excess water stored in Pond No. 3 is sampled to <br />ensure that it will meet effluent standards before being discharged at <br />NPDES point 003. <br />The elevation of the design water level in Pond 3 provides for containment <br />of runoff from a 100-year, 24-hour event (0.70 ac-ft) with no discharge <br />while maintaining a minimum freeboard of one foot. The water level in <br />Pond 2 will be maintained at or below the design water level. All <br />hydrology inputs are shown on the Table 6a, SEDCAD+ Version 3.0, Pond 3. <br />Refer to Table 6, Freshwater Pond No. 3 - Design Summary, for design <br />results. Freshwater Pond No. 3's location is shown on the Drainage and <br />Sediment Control Map, (Map 20). Its design drawings, storage capacity <br />table and stage/storage curve are shown on the Water Treatment and Recycle <br />Pond No. 2 and Freshwater Pond No. 3 Designs Map, (Map 22). Since Pond <br />No. 3 is only utilized in the water-use circuit and is not designed to <br />contain sediment or surface runoff, no design calculations are provided. <br />• <br />22 R Revised - March 1992 <br />