_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

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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.
North of the drainage, along the broad ridge between 006-E1 and NE3, a former maintenance
road was observed that was poorly vegetated and rilled along several segments (Photo SL2-27).
Maintenance including installation of water bars, scarification and seeding is warranted.
Channel 006-E2
E2 is tributary to El. The riprapped channel has a short north fork near its upper end which is
also riprapped (the fork is not depicted on the PMT map). A gully extends up from the upper end
of the riprapped channel fork for approximately 300', and averages 10-12" deep, somewhat
deeper in short segments (Photo SL2-17). A similar gully of approximately the same length
extends up from the upper end of the riprapped main stem channel. Both gullies will need to be
stabilized in accordance with the approved Rill and Gully Plan. Along the lower end of the
main stem of 006-E2, a short distance upstream from an undisturbed shrub patch, there is one
location where evidence of past side-scour, outside of the riprap, is evident(Photo SL2-18). This
area appears to be healing over,but should be visually monitored.
006 Gulch (Upstream of Ridgeline Access Road)
The regraded "A"Pit highwall slope located to the south of the upper section of 006 Gulch, up-
slope and southeast of the Ridgeline Access Road has been subject to two episodes of instability.
The slope failed following original reclamation grading, resulting in significant displacement
and a primary scarp over 8' in height. Following geotechnical investigation and development of
a remedial plan, the failed slope was graded to a reduced gradient and fully reclaimed in 2004. A
smaller slope failure occurred in the same location in 2008, creating a tension crack extending for
over 200' across the slope, with a scarp 2' to 3' in height in some locations (see Photos SL2-37
and SL2-38). The operator again regraded the slump location to eliminate the scarp, cracks, and
bulging, and to improve drainage along the road ditch along the toe of the slump subsequent to
SL2 inspection, in the late fall of 2009. Due to the condition of the slope at the time of the
SL-2 inspection, and given the history of instability and uncertainty regarding the
effectiveness of the most recent repair, the Division is excluding the "A" Pit highwall slope
failure area (approximately 9.8 acres) from the SL-2 proposed approval area.
A couple hillslope gullies that have been subject to repair efforts in the past are located on the
slopes of the upper 006 watershed, in the area between the Ridgeline Light Use Road and
Ridgeline Access Road. Down-cutting has reinitiated in these previous repair areas, and
further stabilization measures are warranted (channel shaping and TRM liner installation
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