_GENERAL DOCUMENTS - C1981017 ‎(225)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

-jIvert G-1 � , rC, icn Cf soil from sly __
;ti i d i slopes above tie road cut flan comp e`.e I b ICc,<,ad p ie
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
RO-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 RO-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 Tilled for several hundred feet.
The rills appear to originate a short distance above the culvert at the
point where flow from an uoslcae gully empties into the read ditch. The
ditch has apparently been evert_cpe4 at this location .