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PARTI <br />Page No. 14 <br />Permit No_: CO-0000 <br />Effluent Parameter <br />WET, chronic <br />30-Day Average 7-Da;y Average <br />until 12/31/07 NA <br />beginning 01/01/08 NA <br />Daily Maximum <br />Report <br />Statistical Difference <br />and IC25 > IWC <br />The IwC for [his outfall during the 2"~ Quader is S3°/", at all other times the 1WC is 100°/" <br />NA <br />NA <br />t. outfall WTI (Flow weighted Composite Samples from outfalls 016 and 0~ <br />Effluent Parameter Effluent!fConcentration <br />Maximum. Concentrations <br />30-Day Average 7-Day Average <br />WET. chronic <br />Daily Maximum <br />until l2/31/07 NA NA Report <br />beginning 01/01/08 NA NA Statistical Difference <br />and IC25> IWC <br />2. Whole Effluent Toxicity -Chronic Lethality Limitation - <br />outfalls WTB (outfall 004) and WTE (outfall008) -Beginning immediately and lasting through the expiration date of the <br />permit, there shall be no statistically significant difference in lethality (a[ [he 95% confidence level) between the control and <br />any effluent concentration less than or equal to 100% effluent Such limitation shall apply as a daily maximum. <br />outfalls WTA (outfalls 002 and 003), outfall WTC (Outfa11005), Outfatl WTD (Outfai1006), outfall WTF footfall <br />010), outfall WTG (outfall 0t 1), and Outfalf WTf (Outfa11016 and 017) -Beginning January ], 2008, and lasting <br />t}troueh the expiration date of the permit, there shall be no statistically significant difference in lethality (at the 95% <br />confidence level) between the convol and any effluent concentration less than or equal to 100% effluent. Such ]imitation <br />shall apply as a daily maximum. The permittee is required to monitor for WET at these outfalls prior to the effective date of <br />the limitation. <br />outfall WTH (outfalls 012, 013 and 014) -Beginning January I, 2008, and lasting through the expiration date of the <br />permit, there shall be no statistically significant difference in lethality (at the 95% confidence level) between the control and <br />any effluent concenvation less than or equal to 100% effluent in the 1", 3r" and 41h quarters; or less than or equal to 83% <br />in the 2"a quarter. Such limitation shall apply as a daily maximum. The permittee is required to monitor for WET at these <br />outfalls prior to the effective date of the ]imitarion. <br />3. Alternate Limitafion Burden of Proof Requirements <br />"The permittee has the burden of proof when seeking relief from total suspended solids (TSS), total iron and/or settleable <br />solids (SS) limitations, as applicable. All outfalls are eligible for relief from TSS, total iron and SS, as applicable; however, <br />the majority of the loading from any discharge has to consist of storm runoff for the relief to be available. The permittee will <br />need to show that exceedance of the applicable limitations was caused by precipitation (surface runoff water) and not mine <br />water or spoils spring water, through a canparison of the loading from each source. outfalls 009 and Oli are eligible for <br />relief from TSS, total iron aad SS on [he basis that only surface runoff discharges are authorized liom these outfalls. <br />Relief maybe granted for each discharge occun~ence only when necessary and shall ^o[ be granted when fhe permittee has • <br />control over the discharge. The pemtittee should endeavor to meet the primary limitations whenever possible. <br />a. For active outfalls: For rainfall, to waive TSS and total iron limitations, it is necessary to prove that discharge occurred <br />within 4S hours after measurable precipitation has stopped. In addition, to waive settleable solids limitations, it is <br />necessary [o prove that discharge occurred ~.vidtin 48 hours after precipitation g~ eater than the 10-year, 24-hour event has <br />stopped, Fur :;nowntelt. to waitie TS5 and total iron limitations, it is necessary to prove [lint discharge ocatned within <br />