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COLORADO DEPARTMENT OF HEALTH Water Quality Control Division 4210 East 11th Avenue Denver, Colorado 80220 Page 3 of 4 Permit No. COG-850009 IV. FACILITY INFORMATION: This facility is a reclaimed underground coal mining operation. The mine site was reconcoured, and revegecated during 1986. A11 buildings, tanks, and other surface facilities were removed from the site. Three settling ponds at the facility are uszd solely for surface runoff and are designed to contain the 10-year, '24-hour precipitation event. Since the facility is reclaimed, any discharges from the facility should consist of surface runoff only. If discharge of mine water, prep plant water, sanitary water or other non-surface runoff related water becomes necessary, the Permittee will have to request chat an individual NPDES permit be drafted prior co the occurrence of such discharge, to replace this general permit. V. ANTIDEGRADATION: These are not reviewable waters pursuant to Szccion 3.1.8(3)(a) of the Basic Standards and Methodologies far Surface Water (5 CCR 1002-2), based on a finding of no incressed water quality impact. VI. DISCUSSION: Applicable effluent limitations and monitoring requirements regarding post-mining outfalls, are addressed in Part I.B.1(a) and I.B.3(a), respectively of the general permit. Outfalls 001, 002 and 003 are subject to the effluent limitations and monitoring requirements for post-mining outfalls. As these outfalls discharge co Hubbard Creek, a tributary of the Gunnison River (which is a tributary of the Colorado River), coral dissolved solids monitoring of the disciarge shall be performed. Total phosphorus monitoring shall not be performed. See page 3 of the general permit for more information. The Permittee will be required to develop and implement a Storm Water Management Plan (SW-MP). ~1[hough some activit'_es may already be in place, the SWMP will require the Permittee to coordinate best management practices so the result is a reduction or elimination of pollutants reaching state water from areas not limited by effluent limitations. The Permittee will be required to submit the SWMP co the Division for review within si:c months from the dale certification is issued. For specifics of [he Plan and additional requirements, please reference the Part I.B.2 of the 3eneral oermit.