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. PART 1. Page No. 4 Permit No. COG-850000 B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 1. Effluent Limitations a. Active Minine Outfalls ACTIVE MINING PRIMARY LIMITATIONS pH, s.u. Oil and Grease, mg/1 Total Dissolved Solids, mg/1•• Total Phosphorus (as P), mg/1**• N/A 6.5-9.0 N/A 10 Report Report Report Report ACTIVE MINING ALTERNATE LIMITATIONS Any dischazge or increase in the volume of a discharge caused by precipitation within any 24-hotu period less than or equal to the 10-vear. 24-hour precipitation event (or snowmelt of equivalent volume) ~ comply with the following limitations -- subject to burden of proof requirements described in Part I.B.I.d). _ ;, , .. .. ~: _ ~. _..° Limttahon ; . ! `c ,., _.:. ~ .~ nMPatameter, : r _ at ~ _.30.Day AvB . _ ... ;: DarlyMax._'; ..... , Flow, MGD - . _ ..... _. _, , __ . Report ._..._ _. Report 'Total Suspended Solids, mg/1 Report Report Total Iron, mg/1 Discharges from mountaintop removal, and steep slope areas. Report 7.0 s'` All other discharges covered under this permit. Repoli Report Total Manganese, mg/1 Report Report •Settleable Solids, m1/1 Report 0.5 pH, s.u. N/A 6.5-9.0 Oil and Grease, mg/1 N/A 10 Total Dissolved Solids, mg/1•• Report Report Total Phosphorus (as P), mg/1••• Report Report These alternative limitations pertain [o storm events less than a 24-hour period, less than or equal to a two-year, 24-hour precipitation event (or snowmelt of equivalent volume) only. Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour period greater than the ] 0-vear. 24-hour orecioiation event (or snowmelt of equivalent volume) may cotrtply with the following limitations -- subject to burden of proof requirements described in Part 1.B.l.d). Flow, MGD Report Report 'Total Suspended Solids, mg/1 Report Report Total Iron, mg/1 Report Report Total Manganese, mg/1 Report Report •Settleable Solids, mUl Report Report pH, s.u. N/A 6.5-9.0 Oil and Grease, mg/1 N/A 10 Total Dissolved Solids, mg/1•• Report Report Total Phosphorus (as P), mg/1••* Report Report •If discharge is to land, TSS and settleable solids monitoring is waived.••Applies only to drainages within the Colorado River Basin '''Applies only to drainages directly above Chatfield Reservoir, Chary Creek Reservoir, Dt1lon Reservoir, or Upper Bear Creek.