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.., PART I Page lb of 19 Permit No. CO-0027146 A. TERMS AND CONDITIONS 2. cffl~Pnt ;mitat~ons For Outfalls 005 006 007 008 009 010, 011. 012. 013 and 014 (ro nci n..o a) ALTERNATE LIMITATIONS Any discharge or increase in the volume o£ a discharge caused by precipitation within any 24-hour period less than or ecual to the 10-year. 24-hour orecioicacion event (or snowmelc of equivalent volume) may comply with the following limitations subject co burden of proof requirements described in Part I.A.3. Effluent Parameter Flow, MCD Settleable Solids, ml/1 ]JJ pH, standard units (minimum-maximum) Oil and Grease, mg/1 (No visible sheen) Toca1 Dissolved Solids, mg/1 Discharge Limitation Report 0.5 J 6.5-9.0 10 J Report Any discharge cr increase in volume of a discharge caused by precipitation within any 24-hour period treater than the 10-year. 24-hour event (or series of storms or snowmelc of equivalent volume) m~ comply with the following limitations subject to burden of proof requir=meats described in Fart I.A.3. Effluent Parameter Flow, MGD pH, standard Unti=> (minimum-maximum) 011 and Gr~dce, mg/1 (No visible sheen) To cal Dissolved Solids, mg/1 3. Burden of Proof Recuiremencs Discharee Limitation Report 6.5-9.0 10 Report The permittee has the burden of proof when requesting relief from total suspended solids (TSS), total iron and/or settleable solids limitations. Relief shall be granted only when necessary and shall not be granted when the permictee has control over the discharge. The permiccee should endeavor to meet the primary limitations whenever possible. a) For rainfall to waive TSS and total iron limitations, is is necessary to prove chat discharge occurred within 48 hours after measurable precipitation 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 10-year, 24-hour event has stopped. See part I.C, for Footnotes