2015-12-11_PERMIT FILE - C1981008 ‎(2)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2015
• Doc Name: Mine Facilities
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Table of Contents & Mine Facilities
• Media Type: D
• Archive: Yes

F. Sedimentation Ponds 008 through 018 Design Parameters
In accordance with Rule 4.05.2, WFC will use Ponds 007 through 018 to prevent, to the extent
possible, additional contributions of sediment to stream flow or runoff outside the permit area
due to mining disturbance. Ponds 010 and 011 have been fully reclaimed and the drainage area
that was previously to be handled by these ponds is now handled by Pond 013. The pond designs
and or run-off calculations for the sedimentation ponds are shown below:
Pond 007 Attachment 2.05.3(3)-2 As Built Map 2.05.3(3)-2-1 & -2-2
Pond 008 Attachment 2.05.3(3)-4 Map 2.05.3(3)-4-1& -4-2
Pond 009 Attachment 2.05.3(3)-5 Map 2.05.3(3) -5-1
Pond 013 Attachment 2.05.3(3)-6 & 21 Map 2.05.3(3)-6-1
Pond 011 Attachment 2.05.3(3)-20 Map 2.05.3(3)-14
Pond 012 Attachment 2.05.3(3)-12 and 13 Maps 2.05.3(3)-12-1 through 4
Pond 014 Attachment 2.05.3(3)-11 Map 2.05.3(3)-11
Pond 015 Attachment 2.05.3(3)-22 & 24 Maps 2.05.3(3)-15 & 19
Pond 018 Attachment 2.05.3(3)-28 Maps 1, 2, & 3
Ponds 007 and 008 are the only ponds that will remain after reclamation. Pond 013 will remain
for some time after the reclamation of the surrounding land, but will not be permanent. The
demonstration to allow retention of Pond 007 is Attachment 2.05.3(3)-16. The demonstration to
allow retention of Pond 008 is Attachment 2.05.3(3)-19.
Map 2.05.3(3)-1 shows the locations of the as -built and yet -to -be built ponds.
Pond 014 was the post -mine conversion of the pre -mine SAE #2. It was reclaimed along with the
BB detour road and no longer exists as of April 2010.
The sedimentation ponds are designed, constructed, and maintained as follows:
a. Ponds 008, 009, 011, 012, and 013 have been designed to contain the 25 year 24
hour event with no discharge from the emergency spillway. Pond 011 and Pond
013 will have an expected permanent discharge of 1.34 cfs due to pit pumping,
but all sediment pond rules are also satisfied, as shown in Attachment 2.05.3(3)-
14. Ponds 014, 015, and 018 have been designed for a 100 -year 24-hour event
with no discharge. Due to their small drainage area and completely incised
impoundment, there are no embankments to fail and so only run-off volume
calculations have been performed.
Page 2.05.3(3)-13 October 2015 (TR -69)