Laserfiche WebLink
PART 1 <br />Page 8 <br />- Permit Nq CO-OUDD221 <br />A. 'FEILr15 :+,ND CONDIT7ON5 <br />L Effluent Limitations (continued) <br />Whole Effluent Toxicity -Chronic Lethali[v Limitation For Outfalls 004 and 008 <br />Beginning immediately and lastins through July 3l, 2002, there shall be no stanstically significant ddference m <br />lethahry (at the 95% confidence leve0 between the control and any effluent concentration less than or equal to the <br />percentage effluent shown m the following table. Such limitation shall apply as a daily maximum. <br />Outfall Jan-IVlar Apr-Jun Jul-Sep Oct-Dec <br />004 10.8 I2.3 l7.3 7.8 <br />008 11.3 9.3 15.0 6.8 <br />2. Burden of Proof Requirements <br />The permittee has the burden of proof when requesting relief from total suspended solids (TSS), total iron and/or settleable <br />solids limitations. Relief shall be granted only when necessary and shall not be granted when the permittee has control <br />over the discharge. The permittee should endeavor to meet the primary limitations whenever possible. The Division shall <br />have final authority in determining whether relief is granted. Discharges from all outfalls aze eligible for this exemption; <br />however, the majority of [he loading from any discharge has to consist of storm runoff for the relief to be available For any <br />discharge. Out(alls 009 and Ol5 consist entirely of surface runoff, thus all discharges from these outfalls should be eligible. <br />• a For rainfall, to waive TSS and total iron limitations, it is necessary to demonstrate that discharge occurred within 48 <br />hours after measurable precipitation has stopped. To waive settleable solids limitations, it is necessary to prove that <br />discharge occurred within 48 hours after precipitation greater than the 10-yeaz, 24-hour event has stopped. <br />b. For snowmelt, to waive TSS and total iron limitations, it is necessary to demonstrate that discharge occurred within <br />48 hours after pond inflow has stopped. To waive settleable solids limitations, it is necessary to prove that discharge <br />occurred within 48 hours after pond inflow volume greater than the IO-year, 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 <br />claimed. Weather station data may be appropriate in makittg this demonstration. Said proof shall be submitted as an <br />attachment to the Discharge Monitoring Report (DMR) for the appropriate period. The Division shall determine the <br />adequacy of proof. As pan of this determination, the Division shall evaluate whether the permittee could have controlled <br />the discharge in such a manner that primary limitations could have been met. All manual dewatering of ponds that are <br />equipped with automatic dewatering systems must meet TSS and total iron limitations. If a pond has otily manual <br />dewatering capability, relief is available only to the extent required to regain necessary stability and capaciry. <br />3. Post-Mining areas <br />Commencing at the time active miritrtg has ceased and surface areas have been returned to the required contour and <br />revegetation has begun, applicable discharges may be eligible for limitations other than those specified in Parts LA. I. <br />These post mining limitations shall remain in effect until bond release. The permittee shall notify the Division at the <br />appropriate time so that consideration of permit modifications can be made. <br />• See Part LC. for Definitions. Amendment No. I Issued ,U ~ 2~ 1444 Effective SFP ll 1 i4Qq <br />