PARTI
<br />Page No. 5
<br />Permit No.: CO-0038776
<br />1 ~. DEFINITION OF EFFLUENT LIMITATIONS
<br />1. Effluent Limitations
<br />e. Outfa11007 (continued)
<br />ii. Facilities Operation
<br />The petmittee shall at all times properly operate and maintain all facilities and systems of treatment and control (and related
<br />appurtenances) which are installed or used by the permittee to achieve compliance with the conditions of this pemvt. This
<br />provtston requues the opperation of back-up or auxiliary facilities or sumlar systems only when necessary to achieve
<br />compliance with the condiions of the permit. Any sludge produced at the wastewater treatment facility shall be disposed of
<br />in accordance with State and Federal guidelines and regulations.
<br />iii. Percentage Removable Requirements - BODS 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 effluents les collected during the calendar month shalt demonstrate a mitilmum of eighty-five percent
<br />(85%) removal of BODs and~S as measured by dividing the respecfive difference between the mean influent and effluent
<br />concentrations for the calendaz month by the respective mean utfluent concentration for the calendar month, and multiplying
<br />the quotient by 100. ,
<br />iv. Numeric Effluent Limitations
<br />'~, ~~ ~~~~ ~t 'r~ ~~ ~~'~:b~,~,
<br />~r c* ~l p`ud~ '*-s{~:"}'''~w•
<br />~"3- ~" ~j~°n """`, ~ tE
<br />ele -, rc ~ ~ , ~ _ > mutations ~=~-,rw , ,
<br />'~,~ 4:
<br />.F+MBXIInntrlY~.sOtICGntr3{rAi1S 4' wy~«
<br />S ~+~s~'wi'
<br />t''~`ii
<br />M..
<br />~. ~ ~~ ~ s- ~ a~ -n
<br />;r~ ,~- ~
<br />t~ ~X
<br />~`~` ~``~~'~~
<br />~
<br />'t
<br />~' ,
<br />.
<br />.
<br />~. ~ ~, ,Y y;.
<br />D
<br />~~
<br />t"'
<br />~~~~P~to~°
<br />v
<br />~
<br />'
<br />,
<br />.n
<br />. i;-~,-~~-
<br />~
<br />~~~`~ .€a
<br />~~t
<br />'
<br />~
<br />~-
<br />r
<br />.
<br />ow ort
<br />Total Sus ended Solids m Q 30 45
<br />m
<br />Fecal Colifotm, no 100 ml ,000 12,000
<br />uestgn capactrynot a petmu utmt
<br />2. Alternate Limitation Burden of Proof Requirements
<br />The permittee has the burden of proof when seeking relief from total susppended solids (TSS), total iron, and/or settleable solids SS)
<br />limitations, as ap licable. Discharges from Outfalls 011, 012, 013, and D17 are not eligible for this relief. Outfalls 004 and O1 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 availa~le. The permittee will need to show that exceedence of the a pplicable limitations was caused by
<br />precipitation and not mine water, through a comparison of the loading from each source. Outfalls 005, 008, 009, 014, 015 and 018
<br />aze eligible for relief from TSS, total iron and SS on the basis [hat only surface nmoff dischazges aze authorized from these outfalls.
<br />Relief map be granted for each discharge occurrence only when necessary and shall not be granted when the permittee has control
<br />over the dtscharge. The pentrittee should endeavor to meet the prunary limitations whenever possible.
<br />a. For rainfall to waive TSS and total iron limitations, it is necessary to prove that dischazge occurred within 48 hours after
<br />measurab a pprecippitation has stopped. In addition, to waive settleable solyds [imitations, it is necessary to prove that discharge
<br />occurred withirt 48 hours after precipitation greater than the 10-year, 24-hour event has stopped.
<br />b. For snowmelt to waive TSS and total iron limitations, it is necessary to,prove that dischazge occurred within 48 hours after pond
<br />inflow has stopped. In addition, to waive settleable solids limitations, rt is necessary to prove that dischazge occurred within 48
<br />hours after pond inflow volume greater than the 10-yeaz, 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 />Dischazge Monitoring Report (DMR~for the appropnate period. The Division shall detennine~the adequacy of proof. As part of this
<br />detemtination, the Dtvision shall evaluate whetthher the petmittee could have controlled the discharge m such a manner that primary
<br />limitations could have been met All manual dewatering of ppoonds that aze equipped with automanc dewateting systems must meet
<br />TSS and tt5tal 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 requtted contour and revegetation has commenced, applicable dichazges may be
<br />eligible for post-mining limitations. In most cases, these post-mining lmitalions shall remain in effect until bond release. The
<br />permlttee shall notify the Division at the appropriate time so that consideration of permit modifications can be made. Prior to
<br />notification and subsequent permit modificahcn, 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 />tahons or a or tota recovera a trop o art LA.l.d., effective January 1, 2007, in accordance with a schedule of
<br />compliance approved by the Division.
<br />i. The pemtittee must, by December 31, 2004, submit a plan for approval that identifies operational changes, modification of
<br />the existing treatment system, or construction of a new treatment system. A schedule opf dates to accomplish various tasks
<br />related to the plan should also be included such that compliance with the final Total Recoverable Iron limttations for Outfall
<br />017 maybe attained.
<br />Re.~sed 4/192004
<br />
|