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
during the inspection. Comments also describe any enforcement actions taken during the inspection
and the facts or evidence supporting the enforcement action.
There are dense patches of Canada thistle along this channel that will need to be treated.
There is a hill slope gully approximately 2' deep that flows into the channel from the east,
approximately 600 feet up the channel from the 006-E1 confluence. The gully does not
appear to be marked on the 2006 Rill and Gully Map, but will require repair.
Upstream from the steep middle segment, some problems were observed. At the very upper
limit of the riprap, it appears that the job was not quite finished. Riprap was somewhat mounded
in the channel at this point, and flow coming down the channel had been diverted as a result to
the outside of the channel. Underliner had been placed along a 50 foot segment of channel
upstream from the riprap "mound", but riprap had not been installed (see Digital Image 0182).
Downstream from the upper limit of riprap, the riprap had not been properly placed, but had
been left as mounded ridges or berms along the sides of the channel as previously noted in
other channel locations. Upstream from the segment of exposed underliner, the trapezoidal
channel gradient was approximately 15%, and rills had developed along the channel.
Maintenance and repairs are necessary along the channel upstream from the steep
middle segment, including grading of the riprap to eliminate berms along the sides of the
channel, and extension of riprap along the exposed underliner segment and continuing
upstream as warranted. Gully caused by flow diversion at upper end of riprap will need
to be repaired.
006-NE3 Channel
Drawing 20-5.1 shows a generally concave profile for the NE3 drainage, with a short, steep slope
segment at the upper end (22%), with slopes in the 9 to 14% range for mast of its length, and a low
gradient (7.5%) segment at the lower end in the vicinity of Design Point RR, at which point the drainage
is identified as 006-NE2. Figure 20-1.1 specifies a vegetated or gravel lined channel, depending on
slope.
• Observed gradients appear to conform with design limits. The drainage has the appearance of
a vegetated swale or woody draw, with a defined channel no longer apparent along most of the
length of the drainage. The drainage appears to be stable and well vegetated; no problems
were noted.
006-NE2 Channel
Designs show NE2 channel extending approximately 1000', from beginning at Design Point RR, down to
Design Point C, at the confluence with 006 Gulch. Design profile shows gradient increasing from 7.5%
at upper end to 39% along a segment 300' to 400' upstream from the confluence, with a 22% gradient
along the lower-most segment. Figure 20-1.1 specifies a trapezoidal channel with 5' bottom width, 7"
depth, 8.6' top width, and 6" D50 riprap, for channel grades up to 40%.
• Channel profile appeared in general to conform with approved design; maximum gradient
measured was 33% along the lower segment.
• The channel construction did not conform with the approved design along the upper section.
Upper channel section was a narrow "V" ditch, rilled in some locations, up to 25% gradient in
one location. See Digital Image 2576. Channel work is warranted along upper segment of
NE2 (upstream from riprapped segment) fo conform with approved design.
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