2014-05-13_PERMIT FILE - C1996083A ‎(3)‎

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2014
• Doc Name: pages 2.05-84 to 2.05-165
• Section_Exhibit Name: Volume I 2.05 Operation and Reclamation Plans Part 2
• Media Type: D
• Archive: Yes

As explained in Section 2.04.7, the Bowie No. 2 Mine is experiencing an
inflow of approximately 700 gpm. Recent mine water quality analysis are
shown above in section 2.05.6(3)(a)(iv). For the purposes of this PHC a
worst case mine inflow /discharge of 1,000 gpm from Outfall 006 is utilized.
Flow from outfall 006 need only travel a short distance to enter a highway
culvert and join the North Fork of the Gunnison River. See Map 41, Mine
Discharge Pipe Alignment. The heavily vegetated water course from Outfall
006 to the highway culvert will eliminate the possibility of sediment entering
the North Fork of the Gunnison River, due to erosion. Since the mine
discharge will mix with the River water in a relatively short distance, there are
no lands, river banks, structures, alluvial valley floors or prime farm land on
either side of State Highway 133 that potentially may be adversely affected
by the mine water discharge quantity or quality.
The average TDS and total recoverable Manganese measurements at the
upstream North Fork of the Gunnison River monitoring station for the
baseline period (2007 AHR) are 130 and 0.015 mg /I respectively. The
average iron measurement at the upstream North Fork of the Gunnison River
monitoring station for the baseline period (2007 AHR) is 0.09 mg /I. The
• following table presents the estimated affect the average mine water quality
(page 2.05 -70i) will have on the quality of water in the North Fork of the
Gunnison River at low flow:
PHC North Fork of the Gunnison River
Based upon the above calculations, the mine discharge into the North Fork of
the Gunnison River will not have a measurable impact on total recoverable
manganese or total recoverable iron in the river. TDS values in the river
would increase under rare low flow conditions.
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Flow
Gpm
Flow
Cfs
TDS
mg /I
Manganes
a
Trec. mg /I
Iron
Trec, mg /I
North Fork
11,220
25
130
0.015
0.09
Mine Discharge
j 1,0001
2.2
2,838
0.0371
2.43
Combined Flow
1 12,2201
27.2
3521
0.0171
0.28
Based upon the above calculations, the mine discharge into the North Fork of
the Gunnison River will not have a measurable impact on total recoverable
manganese or total recoverable iron in the river. TDS values in the river
would increase under rare low flow conditions.
PR -12 2.05-110 02/10
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