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1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />PBOBABLS HYDEOLOGIC COBSEQDSliCS9 S7A2ElO;gf EBVIEW <br />Section 2.05.6 (3) of the Southfield Mine permit. Probable Hydrologic <br />Consequences. has been reviewed and compared to data collected from the <br />monitoring program. Each part of the water monitoring program is <br />discussed. <br />Ground Water - Quality <br />The original permit submittal concluded that water movement will be from <br />the surrounding ground water system into the mine cavity. Statements in <br />the permit concluded there can be no migration of water from the mine <br />during active mining into the surrounding ground water system and ae a <br />result. there can be no significant changes in the quality of ground water <br />in the nearby aquifers as a result of mining. The monitoring data show no <br />significant change; therefore. no change ie necessary to the monitoring <br />program. <br />Ground Water - Quantity <br />Data from the monitoring wells in the vicinity of the mine indicate that <br />water levels have been drawn down as a result of mining or show no <br />interference from the operation. Mine inflow estimates of 142.5 acre-feet <br />per year have been used along with assumptions of hydraulic gradient in <br />the coals to calculate an average hydraulic conductivity value of the <br />producing intervals of 1.25 feet per day. This value indicates that the <br />ability of the coals to produce and transmit water is extremely limited. <br />Water level data indicate that the source of water to mine ie localized <br />and the cone of depression surrounding the mine cavity does not extend for <br />appreciable distances from the mine. <br />The monitoring program data indicate that the ground water system <br />1 reacting to the mine operation as predicted by the original submittal. <br />change in the ground water monitoring program is necessary. <br />1 <br />is <br />No <br />- 6 - <br />