HYDRO27562

• Permit No: C1982056
• IBM Index Class Name: Hydrology
• Doc Date: 3/31/1998
• Doc Name: AUTHORIZATION TO DISCHARGE UNDER COLO DISCHARGE PERMIT SYSTEM
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART I
Page lg of 14
Permit No. CO-0027154
A. TERMS AND CONDITIONS
1. fluent Limitations
d) Effluent Limitations For Outfalls 002 - 004, 006 and 008 (continued)
ALTERNATE LIMITATIONS
Effluent Paramete
°low, MGD
Settleable Solids, ml/1 jJkJ
~H, standard Units (minimum-maximum)
Jil and Grease, mg/1 (No visible sheen)
Total Dissolved Solids, mg/1
Discharge Limitation
Report
Report
6.5-9.0
10 J
Report
e) Effluent Limitations For Outfalls 009. 010. Olu and 017 (surface runoff disch:.rges
from post mining areas)
Effluent Parameter
?low, MGD
settleable Solids, ml/1 jfVcJ
~H, standard units (minimum-maximum)
)il and Crease, mg/1 (No visible sheen)
:lectrical Conductivity, umho/cm
Discharge Limitation
Repor~
0.5 J
6.5-9.0
10 J
Report
Any discharge or increase in volume of a discharge caused by precipitation within any
24-hour period greater than the 10-year. 24-hour event (or series of storms or snowmelt
of equivalent volume) nLay comply with the following limitations subject to burden of
proof requirements described in Part I.A.2.
Effluent Parameter
'low, HGD
ettleable Solids, ml/1 jl1cJ
H, standard Units (minimum-maximum)
it and Grease, mg/1 (No visible sheen)
lectrical Conductivity, umho/cm
Discha_ge Limitation
Report
Report
6,5-9.0
.. 10
Report
f) Whole Effluent Toxicity - Chronic Lethality Limitation - Outfalls 001. 005 and 007
Beginning April 1, 1996, and lasting through Harch 31, 1998, there shall be no
statistically significant difference in lethality (at the 95X confidence level)
between the control and any effluent concentration less than or equal to 100X
effluent. Such limitation shall apply as a daily maximum.
ae Part I.D. for Footnotes
Corrected 03/15/93
Amendment No. 2 Issued 07•~~•4}/ Effective 0~. o% / 1/