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PART I <br /> Page 3 of 16 <br /> PERMIT NO: CO-0039136 <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 plants, and associated areas which would result from a <br /> 10-year, 24-hour, precipitation event. The term "10-year, 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 submit 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 Mining, the Federal Environmental Protection Agency, or other <br /> appropriate agency acceptable to the Colorado Water Quality Control <br /> Division, stating that the above criteria have been met. <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 the limitations set forth in PART 1 . A 1 . Page 2 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 /> 3181 <br />