Laserfiche WebLink
• <br />• <br />52.05 APPLICATION FOR PERMIT FOR SIIRFACE OR UNDERGROUND MINING ACTIVITIES -- <br />MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />2.05.6 Mitigation of Surface Coal Mining Operation Impacts. (Cont'd.) <br />(3) (b) (iv) <br /> <br />klb ~~~ <br />riw~~~rTOY~ v~ <br />2 ~ornmvrri~~n <br />,~ ~~;~ ~ <br />~~ 1 <br />(Cont'd.) <br />The hydrologic properties of faul[-fracture <br />inflow zones encountered within the mine are <br />typically of small magnitude, yet permanent on <br />duration. During spring run-off and precipi- <br />tation events, fault controlled inflow does <br />not increase significantly, which supports the <br />noncontributory nature of overlying bodies or <br />occurrences of water. The predicted impact <br />upon perched groundwater occurrence is a relo- <br />cation to the horizon mined. This predicted <br />impact is not considered adverse nor will re- <br />sult in material damage. The duration of this <br />impact will be the time period of subsidence <br />and reconsolidation, approximately S to IO <br />years. Ongoing monitoring of in-mine inflows <br />and water behind sealed areas will substanti- <br />ate the nonsignificance of this resource. <br />A more extensive aquifer is present below the <br />"D" coal seam (refer to Map 10-1) and no im- <br />pact is predicted for this groundwater occur- <br />rence. Subsidence effects below the coal seam <br />extracted are not documented or expected. Wa- <br />~/ ter levels in DH-70 which is adjacent to mine <br />workings have lowered an insignificant amount, <br />presumably due to the artificial communication <br />between the confined aquifer and evaporative <br />mine conditions. <br />Changes in groundwater quality are typically <br />facilitated by low pH values. Presence of <br />sulfides, and by toxic concentrations of heavy <br />metals. The range of pH in both groundwater <br />6.9 to 7.3, (refer to Volume 4) and overburden <br />7.6 to IO.I, (refer to Volume 1) indicates the <br />solubility of most metals is low and the low <br />sulfide con[ent seemingly precludes a large <br />change in groundwater quality. The similarity <br />in the lithologies containing groundwater and <br />enclosing strata will not alter groundwater <br />quality. Owili-Eger (1983) reports that for <br />longwall operations within the Appalachian <br />. Added 12/26/84 <br />Added 02/26/85 <br />Revised 10/01/87 <br />132 <br />