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,,. ~J <br />~ • <br />~. EFFLUENT LIMITATIONS (Continued) <br />CONTAINMENT REQUIREMENTS (Coal Mines only) <br />• PART I <br />Page 3 of 21 <br />PERMIT N0: <br />CO-0036081 <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-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 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 [o the Colorado Water Quality Control <br />Division, stating that the above criteria have been me [,. <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 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 <br /> <br /> <br />SEP 21 1981 <br />3/81 <br />44, No. 250, December 28, 1979• <br />MINED LAND RECLAMATION <br />Colo. Dept. of Natural Resources <br />