2013-10-08_REVISION - C1982056 ‎(22)‎

• Permit No: C1982056
• IBM Index Class Name: Revision
• Doc Date: 10/8/2013
• Doc Name: Proposed Decision and Findings of Compliance
• From: DRMS
• To: Twentymile Coal, LLC
• Type & Sequence: RN6
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

Mine dewatering and gradient reversal may cause small decreases in Fish Creek and Foidel
Creek stream flows in and around the mined area. Increased or modified recharge is also
possible due to subsidence. Due to the small areal extent and the shale aquitards between
the Wadge coal and the streams, increased recharge would likely not be significant.

Subsidence impacts on Foidel Creek, Middle Creek, and Fish Creek

Subsidence of portions of Foidel Creek, Middle Creek, and Fish Creek will cause gradient
changes in these streams. These gradient changes will result in ponding and channel
incision controlled by the streams’ relationship to orientation of longwall panels and
gateroads. Subsidence cracks in the near surface also have the potential to disrupt the
streamflow. Based on the presence of fine-grained alluvial material, any disruption of
stream flows would be temporary. Site-specific experience from Foidel Creek resulted in a
complete loss of streamflow for approximately 24 hours followed by recovery over the
subsequent months.

See section B, part III B of this document for more information concerning the surface and
ground water monitoring plan.
The Division has evaluated each of these impacts and finds that the operations proposed
under the application have been designed to prevent damage to the hydrologic balance
outside the proposed permit area (2.07.6(2)(c)).

4. The Division finds that the affected area is, subject to valid rights existing as of August 3,
1977, not within:

a) An area designated unsuitable for surface coal mining operations (2.07.6(2)(d)(i));

b) An area under study for designation as unsuitable for surface coal mining operations
(2.07.6(2)(d)(ii));

c) The boundaries of the National Park System, the National Wildlife Refuge System, the
National System of Trails, the National Wilderness Preservation System, the Wild and
Scenic Rivers System including rivers under study for designation, and National
Recreation Areas (2.07.6(2)(d)(iii)(A));

d) Three hundred feet of any public building, school, church, community or institutional
building, or public park (2.07.6(2)(d)(iii)(B));

e) One hundred feet of a cemetery (2.07.6(2)(d)(iii)(C));

f) The boundaries of any National Forest unless the required finding of compatibility has
been made by the Secretary of the U.S. Department of Agriculture. (2.07.6(2)(d)(iii)(D));

g) One hundred feet of the outside right-of-way line of any public road except where mine
access or haul roads join such line, and excepting any roads for which the necessary
approvals have been received, notices published, public hearing opportunities provided,
and written findings made (2.07.6(2)(d)(iv));

21

Foidel Creek MineOctober 8, 2013