PA Bulletin, Doc. No. 19573b
Effluent Limits for Coal Mining Activities For coal mining activities, NPDES permits, when issued, will contain effluent limits that are the more stringent of technologybased (BAT) effluent limitations or Water Quality Based Effluent Limits (WQBEL). The BAT limits for coal mining activities, as provided in 40 CFR Part 434 and 25 Pa. Code ...