2005-12-02_PERMIT FILE - C1981019

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Part Page Permit No. CO-00451E • 2. Alternate Limitation Burden of Proof Requirements (continued) a. For rainfall to waive TSS and total iron limitations, i[ is necessary to prove that discharge occurred within 48 hours afte measurable precippitation has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after precipitation greater than the ] 0-year, 24-hour event has stopped. b. For snowmelt to waive TSS and total iron limitations, it is necessary to prove [hat discharge occurred within 48 hours after porn inflow has stopped. In addition, to waive settleable solids limitations, tt is necessary to prove that discharge occurred within 4. hours after pond inflow volume greater than the 10-year, 24-hour event has stopped. Should a precipitation event or snowmelt occur, the petmittee shall submit adequate proof in order for an exemption to be claimed Weather station data maybe appropriate in making thts demonstration. Said proof shall be submitted as an attachment to the Discharge Monitoring Report (DMR) for the appropriate period. The Division shall determine the adequacy of proof. As part of tht: detetminatton, the Drvtsion shall evaluate whether the petmittee could have controlled the discharge in such a manner that priman limitations could have been met. All manual dewatering of ponds that are equipped with automatic dewatering systems must meet TSt and total iron limitations. If a pond has only manual dewatering capability, relief is available only to the extent required to regair necessary stability and capactty. 3. Post-Minine Areas In conformance with 40 CFR 434.50, commencing at the time active mining has ceased and all surface areas served byy a sedimentatioc and have been returned to the required contour and revegetation has commenced, applicable dischazges may be eligible for post-minim Pmitations. Inmost cases, these post-mining limitations shall remain in effect until bond release. The petrmttee shall notify the Division at the appropriate time so that consideration of permit modifications can be made. Prior to nottficahon and subsequent permit modificafion, active mining limitations will apply regardless of actual mine status. 4. Compliance Schedule a. Salinity Study: The petmittee must submit a report addressing salinity by December 31, 2006. Because there is no record [hat the permittee has previously submitted this report, a compliance schedule is included for the performance ofthe study. However, if a report has previously been submttted, the petmittee should submit a copy ofthis report in lieu ofthe performance of another study. B. MONITORING REQLJIItEMENTS • 1. Frequency and Sample Type In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part I.A. I ,the permittee shall monitor all effluent parameters at the following.frequenctes. Such monitoring will begin immediately and last for the life of the ppermit unless otherwise noted. The results of such monitoring shall be reported on the Discharge Monitoring Report form (See Part I.E.). a. Outfalls OOlA throueh OlOA aTameter Measuremeht requency ~ amp e ype F ow Mon nstantaneous or ontmuous ota us en a o t s m Mon ra ett ea e o t s m on ra tan rease m on tsua s.u. Mon -srtu o[a ecovera a on m Mont Gra BTEX m 0 A o Once er rsc are on ra RT mtn~mn m, f n{ turn t o o Pnn .. ~..,. ...............6 ......... ..,y.... ,,...,...~ ....... ............~ ................... b,,., ....., ...., ...,.......,... MODIFIED AND EFFECTIVE: AUGUST 12, 2005 EXPIRATION: FEBRUARY 29, 2010 a<„;~oa unFnnnc