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PARTI Page No. 5 Permit No.: CO-0032115 Parameter Flow, MGD Total Suspended Solids (TSS), mg/1 pH, s.u. (minimum-maximum) Oil and Grease, mg/1 Total Dissolved Solids, mg/1 Settleable Solids, ml/1 Total Iron, ug/1 c. Outfalls 012.013.015, 016 Parameter Flow, MGD pH, s.u. (minimum-maximum) Oil and Grease, mg/1 Total Dissolved Solids, mg/1 Settleable Solids, ml/1 Limitations Mazamum Concentrations 30.Dav Avera ~e 7-Day Average Report NA Report NA NA NA NA NA Report NA NA NA Report NA PRIMARY LIMITATIONS 30.Dav Average Report NA NA Report NA Limitations Mazomum Concentrations 7-Day Average NA NA NA NA NA Daily Mazamttm Report Report 6.5-9.0 10 Report Report Report Daily Marimum Report 6.5-9.0 10 Report 0.5 ALTERNATE LIMITATIONS Any dischazge or increase in volume of a dischazge caused by precipitation within any 24-hour period ¢reater than the 10-yeaz, 24-hour event (or series of storms or snawmelt of equivalent volume) ~ comply with the following limitations subject to burden of proof requirements descnbed in Part I.A.2. Parameter Limitations Matdmum Concentrafions 30.Dav Average 7-Day Average Daily Marimum Flow, MGD Report NA Report pH, s.u. {minimum-maximum) NA NA 6.5-9.0 Oil and Grease, mg/l NA NA 10 Total Dissolved Solids, mg/1 Report NA Report Settleable Solids, mUl NA NA Report 2. Alternate Limitation Burden of Proof Requirements The pemtittee teas the burden of proof when seeking relief from total suspended solids (TSS), total iron and/or settleable solids (SS) limitations, as applicable. All outfalls 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 surface runoff for the relief to be available. Relief may be granted for each dischazge occurrence only when necessary and shall not be granted when the permittee has control over the dischazge. The pemrittee should endeavor to meet the primary limitations whenever possrble. a. For active outfalls: For rainfall, to waive TSS and total iron limitations, it is necessary to prove that discbazge occurred within 48 hours after measurable precipitation has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after precipitation greater than the 10-year, 24-hour event has stopped. For saowmelt, to waive TSS and total iron limitations, it is necessary to prove that dischazge occurred within 48 hours after pond inflow has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after pond inflow volume greater than the 10-yeaz, 24-hour event has stopped. b. For Host-rrdaina outfalis: For rainfall, to waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after precipitation greater than the 10-year, 24-hour event has stopped. For snowmelt, to waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after pond inflow volume greater than the 10-yeaz, 24-hour event has stopped. See Part I.C. for Definitions.