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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 />