_ENFORCEMENT - C1981017 ‎(10)‎

• Permit No: C1981017
• IBM Index Class Name: Enforcement
• Doc Name: Bid Documents ‎(IMP)‎ Violation CV-90-049
• Violation No.: C-90-049
• Media Type: D
• Archive: No

C. From Sta. 100+00 to Culvert G-15, erosion of soil from cut slopes
and colluviai slopes above the road cut has completely blocked the
ditch in many areas . As a result, drainage has run down the road
and over the fill slope, causing concentrated rill erosion in
numerous locations . The source of concentrated flows causing
erosion of cut slopes and undisturbed colluvial slopes above Road G
is drainage from a light use road which connects the Mine 5 portal
area with the mine fan adjacent to the AML project site. Similar
problem ditch segments continue from Culvert G-15 to Culvert G-12,
between Culverts G-8 and G-7, from Sta. 22+00 to Culvert G-4, and
from Sta. 5+00 to Culvert G-1 .
Road F
14. As with other roads , the drainage ditch does not meet design
configuration for much of its length, with many segments scoured, other
segments filled in with sediment, and required riprap checks not
installed.
15. Downcutting has occurred in the 500 foot ditch segment between
Sta. 125+00 and Sta. 120+00.
16. The ditch had filled in, in the vicinity of Sta. 100+00. This resulted
in drainage escaping the ditch and eroding 3 gullies up to 2 feet deep by
2 to 3 feet wide on the road fill .
17. At approximately Sta. 84+00, sediment eroded from the gully on the slope
above the road has sloughed into the ditch. The material needs to be
cleaned out to restore the design capacity. This is a continuing
maintenance problem which will need to be corrected. Similar deposition
of material has occurred at the base of a gully which originates at the
RD-4 ditch relief drain. The deposition is a short distance above
Culvert F-3, at approximately Sta 85+00.
18. Between Culvert F-5N and a double culvert set above, road drainage has
channeled down the outside edge of the roadway and spilled over the
outslope, causing several gullies up to 2 feet deep on the road fill .
19. Between the RD-2 ditch relief drain and Culvert F-2, the road surface is
50 to 55 feet wide and the numerous drainage ruts originating on the road
surface have led to gullying on the road fill . Several of the gullies
have been blocked with straw bales but additional work is required.
20. Below Culvert F-4N, the road surface is rilled for several hundred feet.
The rills appear to originate a short distance above the culvert at the
point where flow from an upslope gully empties into the road ditch . The
ditch has apparently been overtopped at this location .
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