PERMFILE108469

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 6/2/2006
• Section_Exhibit Name: 2.06 Permits for Special Categories of Mining
• Media Type: D
• Archive: No

West Elk Mine
The effluent from the treatment unit has the following characteristics:
Soluble B.O.D. 16 mg/L
Suspended Solids B.O.D. 14~
30 mg/L
Suspended Solids 30 mg/L
Ammonia (NH3) 1.0 mg/L
Nitrate (N03) 29 mg/L
Combined Chlorine Residual 0.1 mg/L
Fecal Coliforms 10,000/100m1
Table 66 Analysis of Mixing Zone for MCC Discharge to North Fork Gunnison River
Flow in North Fork = 68 cfs on 9/14/2004
MWPF Dischazge (017) = 0.89 cfs on 9/14/2004
MWPF Dischazge (017) = 2.0 cfs (maximum sustained dischazge rate)

Pazameter
Units North Fork

Upper MWPF

Discharge Mixed
i
Value Mme'
Mixed
ValueZ North Fork

Lower Suspect
3
Level Over
Suspect
Level?
Date 9/14/04 11/3/04 9/14/04 9/14/04
pH SU 7.5 8.35 7.7
Conductivity mmhos/cm 131 4900 185
Total Dissolved
Solids
mg/L
90
3200
130
179
130
Specific
Conductance
nunhos/cm
0.131
4.9
0.19
0.27
0.185
0.7
no
Sodium Absorption
Ratio
0.33
78.2
1.2
2.4
1.14
3
no
Boron° mg/L 0.01 2.9 (T) 0.05 0.09 0.05 0.5 no
Chloride° mg/L I 400 (T) 6 12 4 250 no
Aluminum° mg/L 0.03 0.38 (T) 0.03 0.04 0.03 5 no
Arsenic°'s mg/L <0.0005 -- -- -- <0.0005 0.1 nos
Cadmium°• s mg/L < 0.005 -- -- -- < 0.005 0.01 nos
Copper°• s mg/L < 0.01 -- -- -- < 0.01 0.2 nos
Lead°• s mg/L < 0.0001 -- -- -- < 0.0001 5 nos
Manganese° mg/L < 0.005 0.080 (T) 0.006 0.007 < 0.005 0.2 no
Molybdenum°' s mg/L < 0.01 -- -- -- < 0.01 0.1 nos
ickel°• s mg/L < 0.01 -- -- -- < 0.01 0.2 nos
Selenium°• s mg/L < 0.001 -- -- -- < 0.001 0.02 nos
Zinc° mg/L < 0.01 0.01 (T) 0.01 0.01 < 0.01 2 no
' Mixed value is the concentration in the North Fork below Sylvester Gulch using the 9/14/04 North Fork Upper flow
2.06-11 Revised June 1005 PRIG; Rev. March 2006