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RULE 2 - PERMITS <br />Mine surface disturbance areas \\Ill be reclaimed on completion of lllllllllg of \ \hen they are no <br />longer required to support ollgoino mining and related operations. Reclamation, reestabllshnicut of <br />vegctatl\'c Cover. and restoratlou of effective surface draina`e \\111 inllllllllze disturbed area rUlloff <br />to the sedllllentatlon ponds. Restoration of natural drainage and direct discharge to the recelvlll`,? <br />drainages once the Moll- perlllauent sedllllclltatlou ponds are removed at the end of the extended <br />liabilit\ period \\ill effectivel\ eliminate any potential surface \\aler impacts related to the <br />sedimentation ponds. <br />Protection of Ground Water Quantity and Quality <br />PSCNI has incorporated specific Control and initioatlon measures in the proposed lllllllllg and <br />reclamation plans to effectively prevent or minimize sl`unificant lllllllllg related impacts on ground <br />water gUautlt\. quality. and recharge. storaoc and discharge relationships. Ground \\ater systellls <br />\\ill be protected by limiting surface disturbance and mining - related subsidence both of which can <br />alter runoff and infiltration characteristics; controlling mine drainauc and recvcling any significant <br />lllllle lnflo\\ volumes in the operational lllllle water systelll; handlino earth materials, mine draina` ,,e. <br />and runoff In a manlier that minimizes acidic, toxic. or other harmful infiltrations to groundwater: <br />and Illanaging excavations and other disturbances to prevent of Control discharge of pollutants to the <br />grolllld water systelll. <br />PSCM operations have the potential to affect ground water quantity through inflows to the mine <br />\ \orkin,,s frolll the overburden and uriderburden, and the resulting cone of depression in the <br />grolllld \eater potent1onlCtriC surface around the lllllle workings. and frolll alteration Of SUI aCC <br />infiltration characteristics. Nihiing and related operations may also affect ground \rater quality b} <br />inodlfying ground \\titer Clicinlstry, alte'rlllg pH. and increasing concentrations of DS and specific <br />ChCullCal Constituents. Specific acllvltics which play potentially impact grolllld water quantity and <br />quality include the following: <br />• Mine dewatering <br />• Underoro Lind coal removal <br />• Surface placement of coal (stockpiling) and overburden <br />• Retention of drainage in sedimentation pond structures <br />Operational measures that will be implemented to mitigate these impacts are discussed in the <br />following sections. <br />PSCM's planned underground mining operations may result in passive drainage requiring handling <br />of mine inflows. Mine inflows will be collected and routed to temporary underground sumps for <br />retention and recycling to the operational mine water system. Excess mine inflows beyond those <br />required for operational use will be transferred to the surface and ultimately discharged through a <br />CDPS discharge point. As mining proceeds, ground Neater inflows will result in a temporary <br />localized reduction in the potentiometric surface in the adjoining bedrock units. While a localized <br />cone of depression will develop during mining operations, the mine workings will fill with water <br />after operations cease and water levels in the mined area will reach equilibrium with those in the <br />surrounding units. As discussed in the Probable Hydrologic Consequences, the vertical extent of <br />potentiometric head changes in the bedrock units will be limited by the low permeability and <br />thickness of the shale beds above and below the coal seam. These include approximately 540 feet <br />of marine shale intervening between the Wadge coal and the overlying Twentymile Sandstone <br />Midterm Review 2.05 -` l Revision 04/2013 <br />