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II. Support Facilities -Rule 4.04 <br />Support facilities at the mine include administrative and production buildings, surface water <br />runoff control structures, and water monitoring structures. Administrative and production <br />related facilities locations are shown on Exhibits 12-1 and 12-2, of the PAP. Locations of <br />structures relating to surface and groundwater hydrology are shown on Exhibits 7-2 and 7-7 <br />in the PAP. <br />III. Hydrologic Balance -Rule 4.05 <br />A. Water Quality Standazds and Effluent Limitations <br />All dischazges from the Seneca II site from storm runoff, pit pumpage, water treatment <br />facilities, and spoil springs will pass though a sediment pond designed to ensure that all <br />discharges meet effluent limits in Seneca Coal Company's NPDES permit for the <br />Seneca II Mine. A storm water permit and spill prevention containment and control <br />plan associated with the NPDES permit also dictate preventative and mitigation <br />measures for ensuring that all water leaving the mine site meets applicable effluent <br />limits. <br />There are no variances from the requirements of the Rules and Regulations proposed at <br />this time, Therefore, no specific findings regarding water quality standards have been <br />made. <br />The Division has granted three small azea exemptions from the use of sediment ponds <br />due to the limited size of the area and due to the fact that ponds and treatment facilities <br />are not necessary for the drainage to meet the effluent limitations of Rule 4.05.2 and <br />applicable State and Federal water quality standards for receiving streams, and also due <br />to the fact that no mixing of surface drainage with a dischazge from underground <br />workings will occur. The small azeas to be exempted aze the office area and two <br />boneyazd areas. The three areas comprise a total of 5.41 acres of disturbance. <br />(4.05.2(3)(b)(I)). <br />B. Diversions and Conveyance of Overland Flow <br />Drainage channels have been reestablished to their approximate original natural pattern <br />to minimize erosion, to conserve soil moisture and promote vegetation. Drainage <br />reestablishment consisted of the design and construction of 23 permanent postmining <br />drainage channels. The postmine channels are identified as PM-1 through PM-23 and <br />are shown on Exhibits 7-19 and 13-2A of the PAP. Certified designs have been <br />approved for all post-mine drainage channels. Channel PM-1 was redesigned as <br />approved in TR-37 to provide a more stable structure and to provide adequate capacity <br />13 <br />