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Some limited subsidence is inherent with the underground mining methods being <br />• utilized. Consequently some drainage of overlying mine workings will occur. <br />Total drainage of overlying workings is improbable given he fact that <br />groundwater movement will be limited by falls and sediment deposition in the <br />subsidence fractures which serve as conduits for flow. In addition, upon <br />completion of mining and abandonment of the Southfield Mine workings. it is <br />anticipated that the workings will gradually fill with groundwater and a <br />balance will be established between down-gradient discharge through <br />undisturbed strata and inflows from both the mining interval and overlying <br />workings. As flow gradually decreases from the overlying workings, continued <br />inflows to these workings will result in restoration of any groundwater <br />quantities lost through seepage to the Southfield Mine. <br />• <br />• <br />As described in section 2.05.3 - Operation Plan - Permit Area, groundwater <br />inflows to active mine workings are collected by a series of underground <br />sumps and routed to the lower end of the mine. This process will decrease <br />the time in which the total mine workings will fill with water upon <br />abandonment. <br />As previously noted, inflows form the groundwater system to the Southfield <br />Mine workings will result in some lowering of the piezometric surface and <br />continuing induced flaws due to a localized cone of depression. These <br />mechanisms will cause some alteration of groundwater flow patterns in the <br />area of the underground mine workings. This alteration of flow patterns will <br />not be particularly significant relative to the groundwater system <br />C:17M1860VV OL.2IREC. PLN <br />10/24/949:09em WP51/cmc 2.05.6-33 Revised - 9/30/94 <br />