_INSPECTION - C1982057 ‎(33)‎

• Permit No: C1982057
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 10/14/2009
• Email Name: DTM
• Media Type: D
• Archive: No

III. COMMENTS-COMPLIANCE
Below are comments on the inspection. The comments include discussion of observations made during the
inspection. Comments also describe any enforcement actions taken during the inspection and the facts or
evidence supporting the enforcement action.
while a riprapped channel would be necessary for channel segments with gradient between I 1%
and 16%.
Observations during the SL-2 inspection were that the channel had been riprapped and appeared
to be stable, with the exception of a short segment near the upper end, where it appears that a
small slump or slope irregularity resulted in a short, steep drop in the channel (Photo SL2-52). In
this location, the liner was exposed and riprap was washed out.
Given the fact that the channel is stable along most of its length, does not diverge significantly
from premine gradient, and is within or very close to the gradient range specified in the Postmine
Channel Design Summary, the Division will not exclude Channel 006-SI from its proposed
approval decision for SL-2. However,the segment of channel impacted by the sudden drop,
or scarp, depicted in Photo SL2-52 will need to be properly regraded in 2010 to eliminate
the abrupt slope change, and the repaired segment will need to be riprapped in accordance
with approved design.
Channel 006-SE1
This channel drains the southwest portion of the reclaimed"A"Pit area, and joins 006 Gulch
near its lower end. Some maintenance concerns were identified by the Division in the 2006
channel inspection, but no problems were noted during the SL-2 inspection. The lower segment
of the channel had recently been repaired and lined with TRM, and appeared to be in good
condition.
Eastern Ridgeline Areas
The area of coal extraction within the original permit area was a dip-slope land form, in which
the land surface was a broad expanse of long, relatively gradual slopes that rise from west to east,
broken up by a number of ephemeral drainages that flow to the west into Dry Creek or its
tributary Hubberson Gulch. The eastern boundary of the mining area was defined by a
north/south trending ridgeline that drops abruptly off to the east, into steep sided tributaries of
Sage Creek. The ridgeline area was inspected by driving slowly along the Ridgeline Access
Road and Ridgeline Light Use Road segments (LU-3 and LU-4),with periodic stops to allow for
short walks for closer observations. The ridgeline area within the original permit area has been
graded to blend into the adjacent undisturbed slopes, vegetation in most areas is well established,
and there were no locations where excessive erosion or instability was evident.
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