PERMFILE54803

• Permit No: C1981038A
• IBM Index Class Name: Permit File
• Doc Date: 1/9/2004
• Section_Exhibit Name: Volume 8A NPDES Permit Appendix
• Media Type: D
• Archive: Yes

PARTt
Page No: 4
Permit No. COG-850RJ0
B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. Effluent Lirttitations
a. Active Minine Outfalls
ACTIVE MINING PRIMARY LIMITATIONS
Flow, MGD Report
'Total Suspended Solids, mg/I 35
Total Iron, mg/1
Existing Sources 3.5
New Sottrces 3.0
Total Manganese, mg/1 2.0
'Settleable Solids, ml/I Report
pH, s.u. N/A
Oil and Grease, mg/1 N/A
Total Dissolved Solids, mg/1'• Report
Total Phosphorus (as P), mg/1••• Report
Report
70
7.0
6.0
4.0
Report
6.5-9.0
10
Report
Report
\J
ACTIVE MINING ALTERNATE LIMITATIONS -
Any dischazge or increase in the volume of a dischazge caused by precipitation within any 24-hour period less than or equal to the
10-veaz. 24-hourprecinitation event (or snowmelt of equivalent volume) ~ comply with the following limitations -- subject to
burden of proof requirements descnbed in Part I.B.l.d).
Tots! Iron, mg/1
Discharges from mountaintop removal, and steep slope areas. Report 7.0 ~
All other discharges covered wder this pe[mit. Report Report
Total Manganese, mg/I Report Report
•Setfleable Solids, mlR 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), mgR'•• Report Report
These alternative limitations pcrtain to storm events less than a 24-hour period, less than or equal to a two-year, 24-hour prccipitatim event (or mowmelt of
equivalent volume) only.
Any dischazge or increase in the volttme of a discharge caused by precipitation within any 24-hour period greater than the 10-veaz.
24-hour urecipitation event (or snowmelt of equivalent volume) >~ comply with the following limitations -- subject to burden of
proof requirements described in Part I.B.I.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, ml/1 Report Report •
pH, s.u. N/A 6.5-9.0
Oil and Grease, mg/1 N/A 10
Total Dissolved Solids, mg/I•• Report Report
Total Phosphorus (as P), mg/1••• Report Report
•~f dischazge is to land, TSS and settleable solids monitoring is waived.••Applies only [o drainages within the Colorado River Basin
• 'Applies only to drainages directly above Chatfield Reservoir, Chary Creek Reservor, Dillon Reservoir, or Upper Bear Creek
'Total Suspended Solids, mg/1 Report Report