2012-05-11_PERMIT FILE - C1981033 ‎(3)‎

• Permit No: C1981033
• IBM Index Class Name: Permit File
• Doc Date: 5/11/2012
• Section_Exhibit Name: Rule 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: No

2.05.6(3) Protection of the Hydrologic Balance
• The Operator originally believed the source of the contaminants was the coal stockpile.
However, with the emergence of the spring which is near the location of AA1, it is probable
that the quality of water in alluvial well AA1 has been degraded by the spring water since
1986.
II*
The mine portals were sealed on January 9, 1997. On November 17, 1997 the DMG was
notified of a slide that is located immediately west of the reclaimed Bear No. 3 Mine portals.
The slide became active on Saturday, November 15th. Debris from the slide flowed onto
the old coal stockpile pad (west of the the reclaimed stacking tube) and into the North Fork
of the Gunnison River south of the mine access bridge. Shortly after the slide occurred,
water started to flow from the east side of the slide scarp.
Some water could eventually accumulate in the mine workings and result in mine water flow
through the coal seams into the North Fork of the Gunnison River. Although the Operator
does not believe either the B -Seam or the C -Seam will become totally inundated with water,
a worst case analysis was prepared to estimate the seepage from the coal seams. Darcy's
Law was utilized to estimate the seepage from the coal seams as follows:
Area =hxL
K is from MCC's TR -080 documents and provides a range of seepage rates.
The Operator's existing discharge permit provides for the discharge of water directly to the
North Fork of the Gunnison River through outfall 001. The spring water discharge initially
flowed at approximately 20 gpm. As of April 1998, the flow increased to about 35 gpm.
During 2001 the flow from the treatment pond averaged about 16 gallons permit minute with
/1t R -a5
CRN —oy�
/al /PRovED ri / /ylo3
2.05 -55b Rev. 1/03
Darc 's Law Q =Kia
Floode
K -cm /sec
H-
w - width
h-
L-
I-
Q - GPM
d
Head
of coal
Seam
Outcro
H/w
Workin
pillar
Heigh
p
t
Length
B
4 X 10 -6
30
309
20
4223
0.1
0.5
Seam
B
5 X 10 -5
30
309
20
4223
0.1
6.0
Seam
C-
4 X 10 -6
75
159
8
3964
0.47
0.9
Seam
C
5 X 10 -5
75
159
8
3964
0.47
11.0
Seam
Area =hxL
K is from MCC's TR -080 documents and provides a range of seepage rates.
The Operator's existing discharge permit provides for the discharge of water directly to the
North Fork of the Gunnison River through outfall 001. The spring water discharge initially
flowed at approximately 20 gpm. As of April 1998, the flow increased to about 35 gpm.
During 2001 the flow from the treatment pond averaged about 16 gallons permit minute with
/1t R -a5
CRN —oy�
/al /PRovED ri / /ylo3
2.05 -55b Rev. 1/03