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PART I <br />Page v <br />Permit No. CO-0000213 <br />A. TERMS AND CONDITIONS <br />1. Effluent Limitations (continued) <br />(c) Outfall 007 (continued) <br />ALTERNATE LIMITATIONS <br />Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour period less than or equal to <br />the ]0-veer. 24-hour nrecioitation event (or soowmelt of equivalent volume) may comply with the following limitations subject to <br />burden of proof requirements described in Pert I.A.2. <br />Effluent Parameter Discharee Limitations <br />30-Dav Ave Daily Max <br />Flow, MGD Report Report <br />Total Suspended Solids, mg/P Report Report <br />Total Iron, mg/f Report Report <br />Settleable Solids, mP/P N/A 0.5 <br />pH, s.u. (minimum-maximum) N/A 6.5-9.0 <br />Oil end Grease, mg/P N/A 10 <br />Whole Effluent Toxicity, Acute <br />through September 30, 1997 N/A Report <br />beginning October I, 1997 N/A LCD > 100% <br />Aay discharge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10-veer, <br />24-hour event (or series of storms or saowmelt of equivalent volume) ma comply with the following limitations subject to <br />burden of proof requirements described in Part I.A.2. <br />Effluent Parameter Discharee Limitations <br /> 30-Dav Ave Daily Max <br />Flow, MGD Report Report <br />Total Suspended Solids, mg/P Report Report <br />Total Iron, mg/P Report Report <br />pH, s.u. (a3inimum-maximum) N/A 6.5-9.0 <br />Oil and Grease, mg/P N/A 10 <br />Whole Effluent Toxicity, Acute <br />through September 30, 1997 N/A Report <br />beginning October 1, 1997 N/A LCso > 100% <br />(d) Burden of Proof Requirements <br />The permittee has the burden of proof when seeking relief from total suspended solids (TSS), total iron and/or <br />settleable solids (SS) limitations. All discharges of surface runoff authorized under this permit from outfalls 002, <br />003, 004, 005 and 006 are eligible. Outfalls 001 and 007 are eligible for relief from TSS, total iron end SS; <br />however, the majority of the loading from either discharge has to consist of surface rmotT for the relief to be <br />available. The permittee will need to show that exceedeace of the applicable Gn3itations was caused by precipitation <br />and not mine or spoils spring water, through a comparison of the loading from each source. <br />Relief may be granted for each discharge occurrence only when necessary and shall not be granted when the <br />permiltee has control over the discharge. The permittee should endeavor to meet the primary limitations whenever <br />possible. <br />See Part I.C. for Definitions. <br />INDBP <N/93 <br />