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CG:iL tliai::G G1CiLiTIL'S (SURFACE 2UilOFF ONL'i) GENERAL PER2fIT It7 COLORADO RATIONALE COLORADO DISCHARGE PERMIT NUMBER COC-850000 I. Update This is the First renewal of the general permit for coal mining facilities (surface runoff only). The original permit was issued March 8, 1988, and became effective on April 8, 1988. This general permit has been of value both Co pezmiccees and the Division. Permictees who qualify are able to secure a permit in a much shorter time than is required for issuance of an individual permit. The Division's permit drafting burden is lessened by the ability co issue certifications co the general permit for qualified facilities. II. Permit Changes Scormwater Management Plan - The federal effluent guidelines that govern discharges from coal mining Facilities (40 CFR 434) have not changed since the original general permit was issuea. Part 434 controls most surface runoff from coal mining facilities threugh limitations that apply to discharges from sedimentation ponds. This is cons is Cent with regulations implemented by the federal Office of Surface Mining (OSM). In Colorado, the Colorado Mined Land Reclamation Division (CMLRD) assures compliance with these federal requirements, The Division has determined Chat Limitations beyond these are not necessary for such areas. However, these regulations do not address all sources of stormwacer from coal mining facilities. Areas such as roads and railroad lines, pond oucslopes, inactive loadouts, sites used for storage and maintenance of material handling equipment and areas for which small area exemptions have been granted are nor covered by these regulations. The federal stormwacer regulations, issued November 15, 1990, impact the subject Facilities in some substantial ways. As they apply co coal mining facilities, the stormwater regulations primarily address areas not covered by Part 434. Compliance with these reguiations may be achieved through measures of 6esc management practices and pollution prevention. Best management practices (Bt4P) means schedules of activities, prohibitions of practices, maintenance procedures, and other management practices co prevent or reduce the pollution of the waters of the Stara.