A federal district court, in a closely watched ruling, has vacated EPA's controversial guidance setting strict water quality permitting conditions for mountaintop mining in Appalachia, but environmentalists hope that fallout from the ruling may be limited by a separate West Virginia environmental board finding that a state discharge permit must include "enforceable" limits for conductivity and other pollution measures -- a core component of EPA's guidance. West Virginia's top environmental official, however, is downplaying the potential impact of the state...