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• 2.05.6 <br />Average Mine Water Quality <br />B-8 Panel Headgate, B-1 Sump, MW-82 <br />pH (s.u) 8.4 Total Manganese (mg/I) 0.037 <br />Conductivity (umhos/cm) 4,293 Dissolved Manganese (mg/I) 0.011 <br />Total Dissolved Solids (mg/I) 2,838 Total Iron (mg/I) 2.43 <br />Total Suspended Solids (mg/I) 29 Dissolved Iron (mg/I) 0.27 <br />The quality shown above satisfies the water effluent limitations of 4.05.2 and all <br />applicable State and Federal water quality standards which satisfy rule 4.05.16(4). <br />No treatment is required to meet the quality standards. <br />Gravity discharge of water, should it occur, would be piped to the North Fork of the <br />Gunnison River. The effect of the mine water discharge on the River is considered <br />minimal as shown in Section 2.05.6(3)(b)(iii). The approved postmining land use will <br />not be affected in any way by mine water discharge that is piped to the river. <br />The discussion presented under Section 2.04.6(3)(a)(iii)(C) concludes there is no <br />acid forming properties in the coal or surrounding strata. Therefore, the applicant <br />should have no problem discharging water from the mine without treatment. If for <br />• some reason treatment is required, it will be performed as necessary to assure the <br />gravity discharge of water from the mine satisfies the water effluent limitations of <br />4.05.2 and all applicable State and Federal water quality standards. <br />(b)(i) A plan for control of surface and ground water drainage. <br />As explained in (a)(i) above, six sedimentation ponds have been constructed to <br />control surface water drainage through the surface facilities area. Other surface <br />drainage from the permit and adjacent areas is allowed to flow through ephemeral <br />channels unimpeded by the mining operation. Ground water drainage concerns are <br />isolated to potential mine discharge. This ground water drainage, if any, will be <br />treated in underground sumps and discharged to the surface in accordance with <br />NPDES permit requirements. <br />(b)(ii) A plan for treatment and for surface and ground water drainage. <br />Surface run-off from the facilities area should not require treatment, other than <br />detention time provided by the sedimentation control ponds or treatment with <br />alternative sedimentation control. Mine discharge will be treated in underground <br />sumps if required. <br />• <br />TR-54 <br />2.05 - 70i 12/08 <br />pl F~I~OV6D <br />~/~Z/D9 <br />