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s. Effluent WET, chronic until 12/S 1 /07 beginning 01/01/08 ;PART I Page No, l4 Permit Na: CO-00002 Daily Maximum Report Statistical Difference and IC25 > IWC NA NA The I WC for this outfall during the 2"'~ Quarter is 83%, al rill other times the IWC is 100% NA NA t. Outtall WTI (Flow weighted Composite Samples from outfalls 016 and 0172 Effluent Parameter Effluent.Goncentration Maximurtti Concentrations 30-Day Average 7-Day Average WET, chronic Daily Maximum until 12/31/07 NA NA Report beginning 01/0l/08 NA NA Statistical Difference and IC25 > IWC 2. Whole Effluent Toxicity -Chronic Lethality Limitation - I . outfalls WTB (outfall 004) and WTE (outfall 008) -Beginning immediately and lasting through the expiration date of the perntit, there shall be no statistically significant difference in lethality (at the 95% donfidence level) between the control and any effluent concentration less than or equal to 100% effluent. Such limitation shall apply as a daily maximum. outfalls WTA (outfalls 002 and 003), outfall WTC (Outfa11005), outfall WTD (Outfa11006), outfall WTF lOutfall 010), outfall WTG (outfall 011), and OutTall WTI (outfall 016 and 017) -Beginning January ], 2008, and lasting Ituough the expiration date of the permit, there shall be no statistically significant difference in lethality (at the 95% confidence level) between the control and any effluent concentration less than or ecjual to lOD% effluent. Such limitation shall apply as a daily maximum. The pennittee is required to monitor for WET at these outfalls prior to the effective date of the limitation. outfall W'fH (outfalls 012, 013 and 014) -Beginning January 1, 2008, and lasting through the expiration date oC the permit, there shall be ^o statistically significant difference in lethality (at the 95% confidence level) between the control and any effluent concentration less than or equal to f00'% effluent in the 1", 3r° and 4'"quarters, or less than or equal to 83°/~ in the 2nJ quartet Such ]imitation shall apply as a daily maximum. The permittee is required to monitor for WET at these outfalls prior to the effective date of the limitation. 3. Altentate Limitation Burden of Proof Requirements The permittee has the burden of proof when see~zng relief from total suspended solids (TSS), total iron and/or settleable solids (SS) limitations, as applicable. All outfals are eligible for relief from TSS, total iron and SS, as applicable; however, the majority of the loading from any discharge has to consist of storm runoff for the relief to be available. The permittee will need to show that exeeedance of the applicable limitations was caused by precipitation (surface nmoff water) and not mine water or spoils spring water, through a comparison of the loading from each source. outfalls 009 and Oli are eligible for relief from TSS, total iron and SS on the basis that only surface mnoff discharges are,authorized from these outfalls. Relief Wray be granted for each discharge ocewYenee only when ueeessary and shall not be granted when the petmittee has control over the discharge. ~1'he pemtittee should endeavor to meet the primary limitations whenever possibla. a. For active outfalls: For rainfall, to waive TSS and total iron limitations, it is necessary to provo that discharge occurred ~t~thin 4S hours after measurable precipitazion has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that discharge occurred within a8 hours after precipitation g>jeater than the 10-year, 24-hour went has stopped ; or snowntelt, to waive TSS and total iron limimtions, it is necessary to prove that discharge occurred within