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PART 1 <br />Page 3 of 16 <br />- Permit No.: CO-0032638 <br />S AND CONDIT10t7S (Continued) <br />~ c. Effective during periods of precipitation greater than the <br />10-year, 24-hour event for this facility. <br />Any discharge or increase in volume of a discharge caused by <br />precipitation within any 24-hour period greater than the <br />]0-year, 24-hour event (or series of storms or snowmelt of <br />equivalent volume) may comply with the following limitations <br />instead of limitations of Part I.A.1. a and b. j-/ <br />Flow-(P1GD) - monitoring only. <br />Salinity - monitoring only. <br />pN - (Standard Units) shall remain between 6.5 and 9.0 b/. <br />Oil and grease shall no[ exceed 10 mg/1 b/ in any grab sample <br />nor shall there be a visible sheen. <br />d. Additional conditions effective at all times. <br />There shall be no discharge of floating solids or visible foam <br />in other than trace amounts. The discharge shall not contain <br />any sanitary sewage or other pollutants not associated with <br />active mining operations. <br />CJ <br />2. Requirements for Effluent Limitation Compliance Determination <br />Within 90 days of the effective date of this permit, the permittee <br />shall submit to the Division, documentation which specifies the <br />10-year, 24-hour precipitation event (in inches of rain) and the <br />volume of water from active mining areas, preparation plants, and <br />associated areas which would result from a 10-year, 24-hour <br />precipitation event. This documentation shall identify the gauge <br />station being used. Documentation may be in the form of a letter or <br />other indication from the Colorado Mined Land Reclamation Division, <br />the Federal Office of Surface Mining, [he Federal Environmental <br />Protection Agency, or other appropriate agency acC2ptable to the <br />Colorado Water Qualit}~ Control Division. The pervittee is not <br />eligible for Limitations of Par[ I.A.l.c. until this material is <br />submitted. <br />It shall be the permittee's responsibility to document both the <br />rainfall amount and the volume of storm runoff produced, should a <br />precipitation event occur (pursuant to 40 CFR 434.63(c)). i/ <br />3. Post-Mining Areas <br />Pursuant to 40 CFR 434, commencing at the tine active mining ceases <br />and, reclamation "begins all applicable discharges shall be subject to <br />Limitations other than those specified above. These post-mining <br />• li^~itations shall remain in effect until band releas.:. The permittee <br />shall notify the Division upon cessation of active mining so [hat <br />appropriate permit modifications can be made. <br />b/ j-/ - See Part I.A.S. <br />Amc naed_~ <br />Coal-Active 3/83 <br />