2016-10-20_PERMIT FILE - C1981035A ‎(4)‎

• Permit No: C1981035A
• IBM Index Class Name: PERMIT FILE
• Doc Date: 10/20/2016
• Section_Exhibit Name: KI 2.05.6 Mitigation of the Impacts of Mining Operations
• Media Type: D
• Archive: Yes

WORST POSSIBLE CONSEQUENCES OF SUBSIDENCE
The Huntington and Crawford irrigation ditches are the main structures on
permitted or adjacent lands which could suffer damage due to the effects of
subsidence. In the event that a surface subsidence crack were to intersect the ditch,
it is possible that some of the ditch water would enter the crack and work its way
into the mine workings.
In the event that a surface subsidence crack were to intersect either irrigation
ditch, that portion of the ditch which is (or is about to be) damaged can quickly be
repaired using flexible plastic culvert to allow normal water flow. If subsidence
damage occurs, National King Coal, LLC has the necessary personnel and equipment
to effect repairs. Surface owners have and will allow entry to complete such repairs
(See Appendix 2(~jJ.
Due to the ability of National King Coal, LLC to quickly and effectively repair
any subsidence related damage to the Huntington or Crawford irrigation ditches, it
has been determined that no material damage or diminution of reasonable
foreseeable use could result in the event of mine subsidence within the permit and
adjacent areas.
The Marc Crawford residence could suffer damage due to the effects of
subsidence. No mining is planned within 100 feet of Marc=s house. A large block of
un-mined coal will remain beneath this house to provide additional long-term
support for this area. Using a conservative angle of draw of 35 degrees, it was
determined that pillars will not be removed within 300 feet of the footprint of Marc
Crawfor. d=s home. Na mining is-planned- with-i-n 300- feet of .John- Crawford=s home.
The residence of Marc Crawford obtains its drinking water from a pond which
lies approximately 1800' northeast of his house. A buried 2" pipeline runs parallel
to the buried 10-inch- PVC irrigation pipeline- far most of its lerigth. It them- splits off
to connect to the house about 150' northwest of the house. This pond and pipelines
are shown on Map King I-005. Repairs to these pipelines could quickly be effected
with a rented backhoe and- either NKC personnel or a local contractor. The i0"
irrigation pipeline is only used for irrigation in the warmer months. Should this
pipeline be damaged, a temporary overland pipeline could be utilized until repairs
were complete. If the 2 inch line was damaged, a portable cistern could be placed
and domestic water trucked in until repairs were complete. If the pond were
damaged, it would probably need to be re-lined with a custom built liner. This
would require the services of a local contractor with a track hoe or other heavy
equipment. Interim water would need to be provided using a temporary tank. Water
would be hauled by truck to the site. In the event that the underground power line,
underground phone line, or the line connecting the propane tank to the house was
damaged due to the effects of subsidence, service would be interrupted briefly until
repairs were complete. Temporary overland- telephone and propane lines and a
power generator could be installed by the utilities involved. National King Coal
would be responsible for these kinds of repairs.
The residence of John- Crawford obtains its drinking water from a- pond- which
lies approximately 800 feet -north of the John Crawford house. A buried 2" pipeline
connects the house to the pond. This pond and pipeline are shown on Map King I-
005. Repairs to this pipeline could quickly be effected with a rented backhoe and
either NKC personnel or a local contractor. If the 2 inch line was damaged, a
portable cistern could be placed and domestic water trucked in until repairs were
complete. If the pond was damaged, it would probably need to be re-lined with a
National King Coal, LLC King I Mine
Section 2.05.b
Page 3 February, 2007