PERMFILE69459

• Permit No: C1983059A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 2 OTHER PERMITS
• Media Type: D
• Archive: Yes

PART I
Page 4
• Permit No. COG-850000
B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. Effluent Limitations (continued)
a) Active Mining Outfall(s) (continued)
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
10-year. 24-hour orecioitation event (or snowmelt of equivalent
volume) maX comply with the following limitations subject to
burden of proof requirements described in Part I.B.l.d).
Effluent Parameter Discharee Limitations
Maximum Concentration
Daily Maximum J
Flow, MGD Report
pH, standard units (minimum-maximum) 6.5-9.0
Oil and Grease, mg/1 (No visible sheen) 10 e/
Settleable Solids, ml/1 E/ 0.5
Total Dissolved Solids, mg/1 Report
(Colorado River Basin Only)
• Total Phosphorus (as P), mg/1 Report
(Dillon Reservoir and Upper Bear Creek Drainages 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 event (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)
pM shall remain between 6.5 and 9.0 s.u.
Oil and grease shall not exceed 10 mg/1. J e/
ToCa1 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 Outfall(s)
Post-mining limitations may apply to outfalls servigg surface
areas which have been returned to the required contour and on
which revegetation (specifically, seeding or planting) work has
commenced. .The permittee may request consideration for change
from active mining limitations to 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 outfall.
See Part I.B.4, for Footnotes