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II. <br />III. <br />Support Facilities -Rule 4.04 <br />Support facilities used in conjunction with the Yoast Mine include a coal <br />stockpile area, shop, warehouse, bath house, explosives st:or;tge magazines and <br />bins, power lines and a substation, and fuel storage tanks. All facilities will <br />be constructed to prevent damage or disruption of utility lines, water wells, <br />railroads, and pipelines which may pass over, through, or under the permit <br />area. <br />Hydrologic Balance -Rule 4.05 <br />A. Water Quality Standards and Effluent Limitations <br />All discharges of water from the Yoast mine site frorn stoan runoff, pit <br />pumpage, water treatment facilities, and spoil sprnngs will pass through <br />a sediment pond designed to ensure that all discharges meet effluent <br />limits in Seneca Coal Company's NPDES permit for the :toast Mine. <br />A storm water permit and spill prevention containment and control <br />plan associated with the NPDES permit also dictate preve:ritative and <br />mitigation measures for ensuring that all water leaving ttie mine site <br />meets applicable effluent limits. <br />There are no variances from the requirements of the Rules and <br />Regulations proposed at this time. Therefore, no specific findings <br />regazding water quality standazds have been made. <br />B. Diversions and Conveyance of OJerland Flow <br />Three collection ditches are planned for the first five yeaz F~ermit term. <br />Diversion No. 1 is located at the norW end of the coal stockpile, and <br />will be used to route disturbed area drainage to Pond 10. Diversion <br />No. 2 will also route disturbed area runoff, from Topsoil Stockpile A, <br />and runoff carried in Diversion No. 1 to Pond 10. Diversion No. 3 will <br />convey disturbed area runoff around the explosives storage azea, <br />through Armand Draw to Pond 10. Designs for all of these ditches aze <br />located in Attachment 13-2 of the permit application pac}:age. <br />Permanent drainages will be reconstructed in mined azeas, to <br />approximate the original drainage <br />reconstructed aze designed to safely <br />100.yeaz, 24-hour precipitation event. <br />designs are located in Tab 20 and <br />application package. <br />density. Draina;es to be <br />pass runoff from the predicted <br />Details of permanent drainage <br />Attachment 20.1 of the permit <br />Yost Mine 22 July 6, 1995 <br />