2011-08-09_REVISION - C1981019 ‎(10)‎

• Permit No: C1981019
• IBM Index Class Name: REVISION
• Doc Date: 8/9/2011
• Doc Name: Application for Permit Revision ‎(Part 2 of 2)‎
• From: Colowyo Coal Company
• To: DRMS
• Type & Sequence: PR3
• Email Name: MLT
• Media Type: D
• Archive: No

RULE 4 PERFORMANCE STANDARDS
1
for an occasional perched ground water. As discussed in a previous paper, no point of
compliance monitoring can currently occur in the current CM mining area.
With current mining operations in the South Taylor area and, possibly, the Collom mining area,
the following is presented to clarify the geologic and shallow and deep ground water conditions,
to assist in determining whether point of compliance monitoring may be necessary for future
mining areas.
The following is a synopsis of the data submitted d previous of Re camationplM applications
and Safety. Thi
and, more recently, Collom to the Colorado
data are then used to determine if point of compliance monitoring at the CM and proposed mining
areas is possible.
TOporap
The active Colowyo mine area and associated tHilpropThe by
the Colowyo
a of located
topographic high, known as the Danforth
property ranges from 8400 feet on the south e topography decreases elevationibefore
valleys. In addition, south of the topographic highs, p roximatel
another rise to the south. The valleys, he themselves, have elevation ranges from approximately
7100 feet on the south to 6550 feet
st and west by
The current mine area (East, West and SoutY pits)
Creek anddW bordered on Creekon the
the e east and
deeply incised valleys. These valleys are Go od Spring
west respectively. The valleys slope from south to north, with similar topographic slope as found
at the higher elevations where the current mining occurs.
There are other valleys within the area of the f Colowyo
hese valleys (e.g. r Taylor Creek Jubb CreekG and
Sp Creek. However, the headwaters of properties. These
Collom Gulch) tend to originate in the higher elevations within the Colowyo p ro p
valleys do not create deep valleys like Wilson and Good Spring Creek, which cross the
topographic highs.
Geology
The current mine area and associated properties 11 ms ForktFormation Visllcomprised of discordant
the Cretaceous Mesaverde Group. The
beds /units of sandstone, siltstone and mudstone and coal seams, with an approximate thickness of
1,200 to 1,300 feet in the both mine area.
gic
The sediments in this area were deposited in deltaic
zontalaeit throughout the CM area.
beds vary in thickness and lateral extent both Y and vertically
The numerous coal seams in this formation also vary in thickness and lateral extent.
with various
The sandstones tend to be very fine grained mud t grained
es, theses is contain sorted, ous amounts
amounts of silt and clay. For the siltston es and
of finer and coarser materials. The formation is comprised principally of mudstones, siltstones
and coals, with sandstone layers being prevalent.
The Williams Fork Formation conformably e shales. At the top of the Iles
overlies e I Iles the Iles and
comprised of sandstones, siltstones and marine
below the Williams Fork r very the Trout Creek
to fine grained, Sandstone sorted
TCSS, is a massive, white to light gray, rY Revision Date: 8/5/11
Collom Rule 4, Page 17 Revision No.: PR -03