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PARTI
<br />Page No. 5
<br />Permit No.: CO-0036776
<br />~ A. DEFRQITION OF EFFLUENT LIMITATIONS
<br />1. Effluent Limitations
<br />e. Outfa11007 (continued)
<br />ii. Facilities Operation
<br />The permittee shall at all times properly operate and maintain all facilities and systems of treatment and control (and related
<br />appurtenances) which aze installed or used by the pertnittee to achieve compliance with the conditions of this pemrit. This
<br />proviston requues the operation of back-up or auxiliary facilities or smulaz systems only when necessary to achieve
<br />compliance with the conditions of the permit. Any sludge produced at the wastewater treatment factltty shall be disposed of
<br />in accordance with State and Federal gmdelines and regulations.
<br />iii. Percentage Removable Requirements - BOD. and TSS
<br />In addition to the concentration limitations on BODs and TSS indicated above, the arithmetic mean of the BODS and TSS
<br />concentrations for effluent samples collected during the calendaz month shall demonstrate a m;»;m»m of eighty-five percent
<br />(85%) removal of BODs and TSS as measured by dividing the respective difference between the mean influent and effluent
<br />concentrations for the calendaz month by the respective mean influent concentration for the calendaz month, and multiplying
<br />the quotient by 100.
<br />iv. Numeric Effluent Limitations
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<br />2. Alternate Liaritation Burden of Proof Requirements
<br />The permittee has the burden of proof when seeking relief from total suspended solids (TSS), total 'iron, and/or settleable solids (SS)
<br />limitations, as ap licable. Dischazges from Outfalls OI I, OI2, 013, and 017 aze not eligible for this relief..0utfaILs 004 and 016 are
<br />eligible for reliefpfrom TSS total iron and SS; however, the majority of the loading from any dtscharge has to consist of storm runoff
<br />for the relief to be avalla~le. The permittee will need [o show that exceedence of the apppplicable litmtations was caused by
<br />precippitafion and not mine water, through a co arison of the loading from each source. Outfalls 005 008, 009, 014, 015 and 018
<br />are ehgrble for relief from TSS, total iron and Son the basis that only surface runoff dischazges aze aut~rorized from these outfalls.
<br />Relief may be granted for each dischazge occurrence only when necessary and shall not be granted when the permittee has control
<br />over the discharge. The perntittee should endeavor to meet the primary limitations whenever possible.
<br />a. For rainfall to waive TSS and total iron ]imitations, it is necessary to prove that discharge occurred within 48 hours after
<br />measurable precippitation has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that discharge
<br />occurred within 48 hours after precipitation greater than the 10-yeaz, 24-hour event has stopped.
<br />b. For snowme] to waive TSS and total iron limitations, it is necessary to prove that dischazge occurred within 48 hours after pond
<br />ow as stopped. In addition, to waive settleable solids ]imitations, it is necessary to prove that discharge occurred within 48
<br />hours after pond inflow volume greater than the 10-year, 24-hour event has stopped.
<br />Should a precipitation event or snowmelt occur, the permittee shall submit adequate proof in order for an exemption to be claimed.
<br />Weather station data may be apppro riate in making this demonstration. Said proof shall be submitted as an attachment to the
<br />Discharge Monitoring Report (DMR~for the appropnate period. The Division shall determine-the adequacy of proof. As part of this
<br />determination, the Division shall evaluate whether the permittee could have controlled the dischazge m such a manner that primary
<br />limitations could have been met. All manual dewatermg of pponds that aze equipped with automatic dewatering systems must meet
<br />TSS and total iron limitations. If a pond has only manual dewatering capability, relief is available only to the extent required to
<br />regain necessary stability and capacity.
<br />3. Post-Mining Areas
<br />In confomiance with 40 CFR 434.50, commencing at the time active mining has ceased and all surface areas served by a
<br />sedimentation pond have been returned to the requred contour aad revegetation has commenced, applicable dischazges tnay be
<br />eligible for post-mining limitations. In most cases, these post-mining limitations shall remain in effect until bond release. The
<br />peirmttee shall notify the Division at the appropriate time so that consideration of permit modifications can be made. Prior to
<br />notification and subsequent permit modificanca, active mining limitations will apply regazdless of actual mine status.
<br />4. Compliance Schedule
<br />a. Final Total Recoverable Iron Limitations for Outfall 017: The permittee shall achieve compliance with the final effluent
<br />umtanons or ut a or rota recovera e uon o art LA.l.d., effective January 1, 2007, in accordance with a schedule of
<br />compliance approved by the Division.
<br />i. The pemiittee must, by December 31, 2004, submit a plan for approval that identifies opperational changes, modi5cation of
<br />[he existing treatment system, or constmction of a new treatment system. A schedule oT dates to accomplish various [asks
<br />related to the lan should also be included such that compliance wiffi the final Total Recoverable Iron limitations for Outfall
<br />017 may be a ained.
<br />Aecised 4/f9/2004
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