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PART I
<br />Page No. 4
<br />Permit No.: CO-D045161
<br />2. ~ Alternate Limitation Burden of Proof Requirements (continued)
<br />a. For rainfall to waive TSS and total iron limitations, it is necessary to prove that dischazge 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-year, 24-hour event has stopped.
<br />b. For snowmelt, [o waive TSS and total iron limitations, it is necessary to prove that discharge occurred within 48 hours after pond
<br />tflow has stopped. In addition, to waive settleable solids limitations, rt is necessary to prove that discharge occurred within 48
<br />hours after pond inflow volume greater than the ] 0-year, 24-horn 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 appropriate period. The Division shall determine the adequacy of proof. As part of this
<br />determinanon, the Division shall evaluate whether the permittee could have controlled the dischazge in such a manner that primary
<br />limitations could have been met. All manual dewatering of ponds that are 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-Minine Areas
<br />In conformance 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 requued contour and revegetation has commenced, applicable discharges may be
<br />eligible for post-mining limitations. In most cases, these post-mining limitations shall remain in effect until bond release. The
<br />permittee shall notify the Division at the appropriate time so that consideration of permit modifications can be made. Prior to
<br />notification and subsequent permit modification, active mining limitations will apply regazdless of actual mine status.
<br />4. Compliance Schedule(s)
<br />a. Final Total Recoverable Ixon Lunitations: The peimittee shall achieve compliance with the final effluent limitations for total
<br />recoverable uon of art .A.1. ., e ective January 1, 2008, in accordance with a schedule of compliance approved by the
<br />Division.
<br />i. The perrnittee must, by June 30, 2005, submit a plan for approval that identifies operational changes, modification of [he
<br />existing treatment system, or constmction of a new treatment system. A schedule of dates to accomplish various tasks
<br />related to the plan should also be included such that compliance with the final Total Recoverable Iron limitations may be
<br />attained,
<br />• ii. The pertitittee must, by December 31, 2005 and December 31, 2006, submit progrgress reports summarizing the progress in
<br />implementing the plan such that compliance with the final Total Recoverable Iron liitations maybe attained.
<br />iii. The perxnittee must, by December 31, 2007, submit study results that show compliance has been attained with the final Total
<br />Recoverable Iron limitations maybe attained.
<br />Upon approval of the implementation plan by the Division, all terms and conditions of the implementation plan, including but
<br />not ]tauted [o the compliance schedule, will automatically become conditions of this permit.
<br />Progress reports must be submitted for tasks identified in the above schedule. Refet to Part I, Section D, Reporting
<br />Requuemenis, for specific information.
<br />No later than 14 calendar days following each date identified in the above schedule of corttpliance, the petrtittee shall submit
<br />either a report of progress or, m the case of specific actions beingg required by identified dates, a written nonce of compliance or
<br />noncompliance, any remedial actions taken, and the probability of~meetmg the next scheduled requirement.
<br />A schedule for the elimination of the discharge, through connection to another treatment system or by other means, maybe
<br />substituted for this schedule of upgrading.
<br />b. Salmi~Smd~: The pernrittee must submit a report addressing salinity by December 31, 2006. Because there is no record that
<br />e pth ermittee has previously submitted this report, a compliance schedule is included for the performance of the study.
<br />However, if a report has previously been submitted, the pennittee should submit a copy of this report in lieu of the performance
<br />of another study,
<br />B. MONITORING REQUIREMENTS
<br />1. Frequencv and Sample Tyke
<br />•
<br />In order to obtain an indication of the probable compliance of noncompliance with the effluent limitations specified in Part LA.1, the
<br />permittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin immediately and last for the
<br />life of the permit unless otherwise noted. The results of such monitoring shall be reported on the Discharge Monitoring Report form
<br />(See Part IPE.).
<br />a. Outfalls OOlA [hrough O]OA
<br />Pazameter easurement Frequency Samp e ype
<br />ow D on[ nstantaneous or ontmuous
<br />ota Sus en a o t s m on[ ra
<br />ett ea e o i s m on[ ra
<br />i an rease~ ont tsua
<br />Revised 12d/2005
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