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PART I Page iv Permit No. CO-0032638 A. TERMS AND CONDITIONS 1. EfDuent Limitations (continued) (b) Outfalls 004 and 007 THE PERMI"I"I'EE SHALL CEASE IRRIGATION FLOW THROUGH KOLL DITCH AT LEAST 24 HOURS PRIOR TO COLLECTION OF EFFLUENT SAMPLES AT OUTFACE 007 TO ENSURE THAT NO DQ,UTION OCCURS. PRIMARY L~1-IITATIONS Effluent Parameter FIoUv Ratio (~ombi~ed ~ftluent to pstream rout ree )/ Total Suspended Solids, mg/P Oil and Grease, mg/P pH, s.u. (Minimum-Maximum) Settleable Solids, mP/P TDS, mg/P Sulfate, mg/P WET, Acute through June 30, 1998 beginning July 1, 1998 Iron (Total), mg/P Manganese (TR), mg/P Manganese (PD), mg/P Mercury (Total), mg/P Discharee Limitations 30-Dav Ave. Daily Max. 0.100 Repon 35 70 N/A l0 N/A 6.5-9.0 N/A Repon N/A Repon 2750 Repon N/A Report N/A LCD > I00% 3.5 7.0 11.0 Report 0.55 Repon 0.00011 Repon ALTERNATE LIMITATIONS Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour period less than or equal to the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) may comply with the following limitations subject to burden of proof requirements described in Pan I.A.2. Effluent Parameter 30-Dav Ave. FIoUv Ratio (~ombi~ed ~Ouent to pstream rout ree 0.100 Total Suspended Solids, mg/P Report Oil and Grease, mg/P N/A pH, s.u. (Minimum-Maximum) N/A Settleable Solids, mP/P N/A TDS, mg/P N/A Sulfate, mg/P 2750 WET, Acute through June 30, 1998 N/A beginning July 1, 1998 N/A Iron (Total), mg/P Report Manganese (TR), mg/P 11.0 Manganese (PD), mg/P 0.55 Mercury (Total), mg/P 0.00011 Discharee Limitations Daily Max. Report Report 10 6.5-9.0 0.5 Report Report Report LCD > 100% Report Report Report Report See Part I.C. for Definitions. Amendment No. 1 Issued Effective