_INSPECTION - C1982057 ‎(71)‎

• Permit No: C1982057
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 6/17/2009
• 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.
Pond 005 was full and discharging a trickle of clear flow; Ponds 009, 015, 006, 016, 016A, and 017 were full and
discharging clear flow. A significant quantity of sediment, including riprap washed down from eroded permanent
channels had been deposited in Pond 016A. Condition and need for maintenance with respect to sediment
ponds, stock ponds and associated inlet/outlet structures was otherwise as noted in the May inspection report.
Backfillinq and Grading
Slides and Damage
Conditions are essentially unchanged from those described in the May inspection report; please refer to that
report for details.
Hillslope Erosion
Conditions were essentially unchanged from those described in the May inspection report. A significant number
of hillslope erosional features were observed during this and the previous two inspections, most of which are
properly marked for repair on the 2009 R&G Map. The following hillslope rills and gullies were not marked on
the map, but will require stabilization:
• Numerous rills paralleling the TRM channel north of the aspen test plots; hand cut water bars may be
appropriate to direct flow into the channel. A hillslope gully 12"-14"deep enters this channel from the
south, approximately 150' upstream from upper end of TRM segment.
• Numerous rills and gullies were observed on the reclaimed slopes of the PM-3 watershed, which was
heavily impacted by intense rainfall in May. Many of the hillslope rills and gullies were not marked on the
2009 Rill and Gully Map. Most of the erosion is located on slopes to the southeast of the PM-3 channel,
with some of the erosion apparently associated with concentrated flow from the permanent section of
Road "U', and other rills associated with remnant scraper or channel repair access routes. There is at
least one gully and a few areas of concentrated rill erosion on slopes to the northwest of the PM-3
channel. Extensive repairs are required in the watershed, including such measures as additional
water bars,further grading/roughening,TRM installation, contour drill interseeding, manual
check structure installation, etc.,which will need to be completed this field season.
• Other portions of the South Mine area within the watersheds that drain to Pond 016 were not walked as
extensively as the PM-3 watershed, but the intense rainstorm in May also impacted these
watersheds and a significant amount of rill and gully repair is warranted. Numerous repair areas
are marked on the 2009 Rill and Gully Map.
Permanent Channel Erosion
Extensive permanent channel repairs will be necessary in the 016 watershed, which was subject to a high
intensity rainfall event over the weekend of May 23-26. Numerous channel repair locations are delineated in this
watershed on the 2009 R&G map. During the June inspection, it was noted that riprap along the entire length of
Channel PM-3 was blown out and rill need to be repaired/replaced. Much of the riprap used here was ineffective
low density volcanic red rock. The lower 2/3 of the channel was marked for repair on the 2009 Rill and Gully
map, but the entire length of channel will require work.
The operator has initiated rill and gully and channel repairs, but progress has been delayed and set back by
frequent rains and associated erosion and muddy conditions. One location where channel erosion repair was
recently completed is the extremely high gradient PM-4D channel off the east side of the ridgeline, which has
been subject to repeated erosion from snow drift runoff. During the June inspection, the channel was walked
from top to bottom, and the lower gradient natural channel from the toe of PM-4D down to Sediment Pond 015
was also walked. At the upper end of PM-4D, immediately below the light use road, the operator had prepared a
wide catchment area with staked willow bundles installed in a"herringbone pattern", overlain by a wide swath of
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