PERMFILE100069

• Permit No: C1992081A
• IBM Index Class Name: Permit File
• Doc Date: 5/19/2003
• Doc Name: Colorado Discharge Permit Certification for COG-850008
• Section_Exhibit Name: Tab 13 Appendix 13-1
• Media Type: D
• Archive: Yes

t PART.
Page No. a
Permit No. COG•850000
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. Effluent Limitations
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ACTIVE MINING PRIMARY LIMITATIONS
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Flow, MGD Report Report
'Total Suspended Solids, mg/1 35 70
Total Iron, mg/1
Existing Sources 3.5 7.0 ,
New Sources 3.0 6.0
Total Manganese, mg/1 2.0 4.0
'Settleable Solids, ml/1 Report Report
pH, s.u. N/A 6.5-9.0
Oil and Grease, mg/1 N/A ] 0
Total Dissolved Solids, mg/1•• Report Report
Total Phosphorus (as P), mg/1••• Report Report
ACTIVE MINING 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
] 0-year. 24-hour precipitation event (or snowmelt of equivalent volume)'?>aY comply with the following limitations -- subject to
burden of proof requirements described in Part I.B.l.d).
Flow, MCiD Report
'Total Suspended Solids, mg/I Report
Total Iron, mg/1
Discharges from mountaintop removal, and steep slope areas. Report
All other dischazges covered undtt this pertniL Report
Total Manganese, mg/1 Repott
'Settleable Solids, ml/1 Repott
pH, s.u. N/A
Oil and Grease, mg/1 N/A
Total Dissolved Solids, mg/1•• Report
Total Phosphorus (xs P), mg/1••• Repott
Dir. ~:.~~.~
Report
Repo»
7.0 "
Report
Report
0.5
6.5-9.0
10
Report
Report
These alternative limitations pertain to storm evrnts less than a 24-hoin period, less than or equal to a two-year, 24-hour precipitation cvrnt (or snowmclt of
equivalrnt volume) only.
'Total Suspended Solids, mg/1
Total Iron, mg/1
Total Manganese, mg/1
'Settleable Solids, mVl
Report Report
Report Report
Report Report
Report Report
pH, s.u. N/A 6.5-9.0 •
Oil and Grease, mg/1 N/A ] 0
Total Dissolved Solids, mg/1•• Report Report
Total Phosphorus (as P), mg/1••• Report Report
•If discharge is to land, TSS and senleable solids monitoring is waived.•'Applies only to drainages within the Colorado River Basin
'''Applies only to drainages directly above Chatfield Reservoir, Cherry Creek Reservoir, Dillon Reservon, or Upper Bear Creek.
Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour period Rreater than the ] 0-veaz.
24-hour nrecipitation event (or snowmen of equivalent volume)'?? comply with the following limitations -- subject to burden of
proof requirements described in Part I.B.I.d).