PERMFILE126208

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 6/24/2004
• Section_Exhibit Name: Exhibit 07 NPDES Permit
• Media Type: D
• Archive: No

PARTI
Page No. 5
Permit No.: CO-0038776
A. DEFINITION OF EFFLUENT LIMITATIONS
1. Effluent Limitations
e. Outfa11007 (continued)
ii. Facilities Operation
The pemrittee shall at all times properly operate and maintain all facilities and systems of treatment and control (and related
appurtenances) which aze installed or used by the permittee to achieve compliance with the conditions of this permit. This
provtsron requues the operation of back-up or auxiliary facilities or smulaz systems only when, necessary to achieve
compliance with the conditions of the permit. Any sludge produced at the wastewater tteannent faclhty shall be disposed of
in accordance with State and Federal guidelines and regulations.
iii. Percentage Removable Requirements-BOD. and TSS
In addition to the concentration limitations on BODS and TSS indicated above, the arithmetic mean of the BODS and TSS
concentrations for effluent samples collected during the calendaz month shall demonstrate a minimum of eighty-five percent
(85%) removal of BODS and TSS as measured by dividing the respective difference between the mean influent and effluent
concentrations for the calendaz month by the respective mean influent concentration for the calendaz month, and mulfiplying
the quotient by 100.
2. Alternate Limitation Burden of Proof Requirements
The permittee has the burden of proof when seeking relief from total suspended solids (TSS), totaluon, and/or settleable solids (SS)
limitations, as ap licable. Dischazges from Outfalls 011, 012, 013, and 017 aze not eligible for this relief. OutfalLs 004 and 016 are
eligible for reliefpfrom TSS total iron and SS; however, the majority of the loading from any drscharge has to consist of stone runoff
for the relief to be availa~le. The permittee will need to show that exceedence of the appplicable limitations was caused by
precippitation and not mine water, through a comparison of the loading from each source. Outfal1s.005 008, 009, 014, 015 and 018
aze ehgtble for relief from TSS, total iron and SS on the basis that only surface runoff dischazges aze aut(torized from these outfalls.
Relief may be granted for each dischazge occurrence only when necessary and shall not be granted when the pemaittee has control
over the discharge. The permittee should endeavor to meet the primary limitations whenever possible.
a. For rainfall to waive TSS and total iron limitations, it is necessary to prove that dischazge occurred within 48 hours after
measwab~e precippitation has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that dischazge
occurred within 48 hours after precipitation greater than the 10-yeaz, 24-hour event has stopped.
b. For snowmelt to waive TSS and total iron limitations, it is necessary to prove that dischazge occurred within 48 hours after pond
ow s stopped. In addition, to waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48
hours after pond inflow volume greater than the 10-year, 24-hour event has stopped.
event or snowmelt occur,
nay be appropriate in m
limitations could have been met. All manual dewa~
TSS and total iron limitations. If a pond has only
regain necessary stability and capacity.
ittee shall submit adequate proof in order for an exemption to be claimed.
demonstration. Said proof shall be submitted as an attachment to the
period. The Division shall detemtine-the adequacy of proof. As part of this
mittee could have controlled the dischazge m such a manner that primary
of pponds that aze equipped with automatic dewatering systems must meet
al dewatering capability, relief is available only to the extent required to
3. Post-Mining Areas
In confomiance with 40 CFR 434.50, commencinv at the time active mining has ceased and all surface areas served by a
sedimentation pond have been retained to the required contour and revegetation has commenced, applicable dischazges may be
eligible for post-nursing limitations. In most cases, these post-mining limitations shall remain in effect until bond release. The
perrmttee shall notify the Division at the appropriate time so that consideration of permit modifications can be made. Prior to
nottfrcahon and subsequent permit modificancn, active mining limitations will apply regazdless of actual mine status.
4. Corrmliance Schedule
a. Final Tota] Recoverable Iron Limitations for Outfall 017: The permittee shall achieve compliance with the final effluent
tanons or a or to recovera a Iron o art LA.l.d., effective January 1, 2007, in accordance with a schedule of
compliance approved by the Division.
i. The pemtittee must, by December 31, 2004, submit a plan for approval that identifies opperational changes, modification of
the existing treatment system, or constmction of a new treatment system. A schedule oY dates to accomplish various tasks
related to ffie plan should also be included such that compliance with the final Total Recoverable Iron limitations for Ouffall
017 maybe attained.
xe~w an92twa
iv. Numeric Effluent Limitations ~- ~ -