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PART I _ Page lg of 19 Permit No. CO-00327.15 B. MON:CTORING ~UTRRMFNT$ 4. Storm Exemption - 001, 008, 010, 012, 013, 014 (c:ont.) In addition, if discharge occurs as a result of 'the 10-year, 24-hour storm volume being exceeded and the permittee wishes to claim an exemption from technology based effluent limitations, the permittee shall submit, within 5 days of the said discharge, documentation that the facilities were maintained to contain or treat the previously specified volumes. The permittee must also submit documentation of the storm event, including the precipitation recorded at the closest official precipitation gauge station (or the permittee's own gauge), the volume of storm runoff produced and the steps taken to maintain treatment sad minimize the amount of overflow. All data/documentation required by this section which can not: be reported on applicable discharge monitoring report forma (DFOt's) shall be reported in letter form as an attachment to the DMR. Submittal of documentation of containment, maintenance and precipitation records above does not ezempt the permittee from the notification requirements of PART II.A.3. of this permit. 5. Change in Discharge - Notification - 001, 008 and OIO, The permittee may change the status of any of the above listed discharge paints from having only surface runoff as the source to adding mine water. To make this change, the permittee is required to notify the Division 180 days prior to the change taking place. Public notice of the amendment is required. Such notification by the permittee shall include: - the discharge point in question; - the source(s) of wastewater; - the estimated volume, in MGD; and - the estimated length of time such dewatering will occur with relation to this discharge point. If the permittee desires to reverse the process, and eliminate the mine water as a source at a discharge point, the same procedure for amending a permit must be followed. The permittee must be able to document that nA significant amount of mine water remains i.n the sediment pond(s) in question.