INSPEC26917

• Permit No: C1982057
• IBM Index Class Name: Inspection
• Doc Name: Inspection Report
• Inspection Date: 6/29/2006
• Media Type: D
• Archive: No

III. COMMENTS -COMPLIANCE
Below are comments on the inspection. The comments include discussion of observations
made duririg the inspection. Comments also describe any enforcement actions taken during
the inspection and the facts or evidence supporting the enforcement action.
006-NE4 Gulch Channel
October 2005 inspection identified concerns with channel shape, depth, and presence of ruts, and
maintenance was recommended. Please refer to DMG inspection report issued October 12, 2005
for detailed observations.
From general observations made during the June 2006 inspection, it appeared that maintenance had
been performed on segments of concern, however detailed re-inspection was not conducted, due to
time constraints. Operator should conduct a check of the repaired channel to ensure that
concerns addressed in the October 2005 inspection were addressed, and to verify that the
channel complies with the approved design.
006-NE1 Gulch Channel
October 2005 inspection identified concerns with channel shape, riprap placement, presence of rills, etc
Maintenance was recommended for various segments. Please refer to DMG inspection report
issued October 12, 2005.
From general observation it appeared that maintenance had been performed on segments of concern,
however detailed re-inspection was not conducted, due to time constraints. Operator should conduct a
check of the repaired channel to ensure that concerns addressed in the October 2005 inspection
were addressed, and to verify that the channel complies with the approved design. A major
segment of the 006-NE1 channel is shown in the left center of Digital Image 0164.
006-E1 Channel
Upper Section (HH to SS on Exhibit 20-2)
Channel profile on permit Drawing 20-5.1 depicts channel slope increasing from approximately
13% at HH (upper end above Ridgeline Road), to approximately 21% along the steepest
segment, which ends approximately 500' upstream from SS. From the lower end of the steep
segment, design profile depicts a 12% gradient segment extending down to SS (the 006-E2
confluence}. The permit channel design sheet (Figure 20-1.1) specifies a trapezoid channel
with bottom width of 2', top width approximately 6', depth 8.4", and riprap with 6" D50 for
slopes between 8% and 27%.
From our inspection, upper segment above road was somewhat steeper than indicated
on design profile, with steepest sections ranging from 15% to 19%. The channel above
the road was a "V" shaped channel and was not riprapped. The lower segment of the
channel just upgradient of the road was Tilled 6"-9" deep. There was also shallow
Tilling parallel to the outside of the channel due to flow concentration along a berm that
had resulted from channel construction. For the section of HH-SS upgradient from
the Ridgeline Road crossing, channel shape and liner do not appear to be in
conformance with approved design for the gradient. Modification is necessary to
conform with approved design.
• Downstream from the Ridgeline Road crossing, the segment is a riprapped trapezoid
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