PERMFILE103828

• Permit No: C1981024
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 7 NPDES PERMIT INFORMATION PART 1
• Media Type: D
• Archive: No

u
B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. Effluent Limitations (continued}
a) Active Mining Oucfall(s) (continued)
ALTERNATE LIMITATIONS
PART I
Page 4
Permit No. COG-850000
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 nrecinitation event (or snowmelt of equivalent
volume) may comply with the following limitations subject co
burden of proof requirements described in Part I.B.l.d).
Dail r~Haximwn
Effluent Parameter
Flow, MGD
pH, standard units (minimum-maximum)
Oil and Grease, mg/1 (No visible sheen)
Settleable Solids, ml/1 g/
Tecal Dissolved Solids, mg/1
(Colorado River Basin Only)
Total Phosphorus (as P), mg/i
(Dillon Reservoir and Upper Bear Creek Drainages
Discharge Limitations
Maximum Concentration
Report
6.5-9.0
10 J
0.5
Report
•
Report
Orly)
Any discharge or increase in the volume of a discharge caused by
precipitation within any 24-hour period greater than the 10-year.
24-hour orecipitation evettc (or snowmelt of equivalent volume)
may comply with the following limitations subject to burden of
proof requirements describd in Part I.B.l.d).
Flow, MGD - monitoring only per Part I.B.2.a)
pH shall remain between 6.5 and 9.0 s.u. J
Oil and grease shall not exceed 10 mg/1. J J
Total Dissolved Solids, mg/1 - monitoring only per Part I.B.2.a)
(Colorado River Basin Only)
Total Phosphorus (as P), mg/1 - monitoring only per Part I.B.2.a)
(Dillon Reservoir and Upper Bear Creek Drainages Only)
b) Posr.-Mining Outfill(s)
Post-mining limitations may apply to outfalls serving surface
areas which have been returned co the required contour and on
which revegetation (specifically, seeding or planting) work has
commenced. The permictee may request consideration for change
from active mining limitations co post-mining limitations when
these conditions have been met. Each facility certification
shall state whether active mining or post-mining limitations
apply to each authorized oucfall.
See Part I.B.4, for Footnotes