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PART I <br />Paae 4 of 24 <br />PERMIT N0: CO-0033685 <br />~" • <br />A. EFFLUENT LIMITATIONS (Continued) <br />(.CONTAINMENT REQUIREMENTS (Coal Mines only) <br />The facilities shall be designed, constructed and maintained to <br />contain or treat the volume of water from active mining areas, <br />preparation~planis, and associated areas which would result from a <br />10-year, 24-hour, precipitation event. The term "10-yea r, 24-hour <br />precipitation event" means the maximum 24-hour precipitation event with <br />a probable reoccurrence interval of once in 10 years. <br />Within 90 days of the effective date of the permit, the permittee <br />shall s- ub~mit verification that the facility has been designed, <br />constructed and maintained in accordance with the criteria above. <br />This verification shall also identify the gauge station used and the <br />10-year, 24-hour precipitation figure (in inches of rain). <br />Such verification may be in the form of a letter or other indication <br />from the Colorado Mined Land Reclamation Board, the Federal Office of <br />Surface Mtning, the Federal Environmental Protection Agency, or other <br />appropriate agency acceptable to the Colorado Water Quality Control <br />Division, slating that the above criteria have been met. <br />l • <br />STORM EXEMPTION` <br />Any overflow, increase in volume of a discharge, or discharge from a <br />by-pass system, which is caused by precipitation or snowmelt, shall <br />not be subject to [he limitations set forth in Part 1-A-1, page 3 of this <br />permit. This exemption is available only if the facility has met the <br />10-year, 24-hour containment requirements. <br />Federal Register, Vol. 44, No. 250, December 28, 1979• <br />• <br />3/81 <br />