PERMFILE116216

• Permit No: C1984062
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: CHANGE IN PN COG-850013 FORMERLY CO-0036021 ROUTT CNTY
• From: CDOH
• To: CYPRUS MINERALS CO
• Section_Exhibit Name: EXHIBIT 4 ‎(Part 2)‎ NPDES CHANGE
• Media Type: D
• Archive: No

PART I
Page 5
Permit No. COG-850000
•
B. EFFLUENT LIIiTTATIONS AND MONITORING REQUIREMENTS
1. Effluent Limitations
(a) Active Mining (Continued)
Any discharge or~iacrease in the volume of a discharge caused by
precipitation xithin nay 24-hour period rester than the 10- ear
24-hour precipitation event (or snoxmelt of equivalent volume
comply xith the folloxing limitations subject to burden of
proof requirements described in Part I.B.l.d).
Flox, MGD - monitoring only per Part I.B.2.a
Total Dissolved Solids, mg/1 - monitoring only per Part I.B.2.a
(Colo. River Basin Only)
Total Phosphorus (se P), mg/1 - monitoring only per Part I.B.2.a.
(Dillon Reservoir drainage only)
pH shall remain betxeea b.5 and 9.0 s.u. c/.
011 and grease shall not ezceed 10 mg/1 c7 nor shall there be a
visible sheen f/.
(b) Poat-Mining
Effluent Parameter
Discharge Limitations •
Mazimum Concentration
Daily Mazimum c/
Plox, MGD Report
Settleable Solids, ml/1 h/ 0.5
Total Dissolved Solids, mg/1 (Colorado River Basin Only) Report
Total Phosphorus (as P), mg/1 (Dillon Reservoir Drainage Only) Report
pH shall remain betxeen 6.5 sad 9.0 s.u. c/.
011 and grease shall not ezceed 10 mg/1 c/ nor shall there be a visible sheen f/
Any discharge or increase in the volume of a discharge caused by
• precipitation xithia any 24-hour period rester than the 10- ear
24-hour precipitation event (or snoxmelt of equivalent volume ~Y
comply xith the folloxing limitations subject to burden of proof
requirements described in Part I.B.l.d).
Flox, MGD - monitoring only per Part I.B.2.b
Total Dissolved Solids, mg/1 - monitoring only per Part I.B.2.b
(Colo. River Basin Only)
Total Phosphorus (as P), mg/1 - monitoring only per Part I.B.2.b.
(Dillon Reservoir drainage only)
pH shall remain betxeen 6.5 and 9.0 s.u. c/.
011 and grease shall not ezceed 10 mg/1 c7 nor shall there be a •
visible sheen f/.
See part I.B.3. for Footnotes