Work_List_Road_460B_Road_Obliteration.pdf

460-B ROAD DECOMMISSIONING

WORK LIST

ROAD NO. 460-B

*Recommend field.

Road 460B begins off road 460 beyond Fan Saddle. Access is via roads 101, 486, 5525, and 460. The road is gated at the beginning and is closed year long to all vehicles. No work is planned under this contract for the first 0.90 miles of road 460B at Placer Creek which is to be kept on the Forest Service System. The work to be done starts at MP 0.90 and ends at MP 1.94 and includes numerous seeps and dry draws. Road widths range from 12 to 20 feet and fill depths average 5’ - 15’. The ground is steep and the fills are very large. Material in the large fill is required to be hauled away to stable areas either within the project area (ridge points) or offsite in waste areas approved by CO. These may be up to 10 miles away. See Remarks in the Work List for estimated volumes. The cost of this haul is incidental to the Roadway Obliteration. There is a fill failure at MP

1.23 for approximately 50’ where the road is as narrow as 6’. It is anticipated that an excavator will not have any trouble getting enough width for short term access.

Work to be done at this site consists of:

• Recontouring the road prism for 0.94 miles

• Restoring stream channels to their natural grade and dimensions and revegetating as per the specifications

• Draining seeps and wet ditches using cross drain channels and vegetation mats

• Providing necessary erosion control including sediment trapping and live stream diversions as per the specifications.

STATION ACTIVITY DESCRIPTION REMARKS

(miles) (feet)

0.94 4965 Begin project Road 460-B 0.94miles .

Project begins at Placer Creek 0.94 miles from road 460.

Begin Item 21101 Roadway Obliteration, Method I

Begin Seeding – 3.2 acres

0.94 4965 Item 21101 Existing 18” CMP-Remove Construct Stream Grade Channel Live Water; Placer Creek

8' bank full width channel Enter old cutting unit above to MP 1.06 Large Fill- estimate 400 cubic yards of embankment to be hauled to waste site?

0.97 5135 Item 21101

Construct Cross Drain Channel

1.06 5594 Item 21101 Possible log culvert in damp draw Construct Stream Grade Channel Leave old cutting unit above

Large Fills- estimate 100 cubic yards of embankment to be hauled to waste site.

1.09 5776 Item 21101 Existing 18" CMP in wet draw

Construct Stream Grade Channel

1.18 6233 Ridge point

Miles Feet ACTIVITY DESCRIPTION REMARKS

1.20 6350 Item 21101 Saturated road; Seep from cutslope

1.23 6512 Old fill failure; 6' of road width remains

1.24 6537 Item 21101 Ponding on road

1.24 6560 End fill failure

1.34 7076 Old cutting unit above

1.41 7427 Item 21101 Dry draw. Leave old cutting unit above Drainage Excavation

1.52 8016 Item 21101 Wet draw; water across road Saturated Road for 10' + Construct Stream Grade Channel

1.63 8620 Item 21101 Road surface saturated for 40'

1.69 8936 Item 21101 Road surface saturated Road has gullies from flow from 9135 channel

1.73 9135 Item 21101 Possible log culvert in wet draw Large Fill- estimate 100 cubic yards of embankment to be hauled to waste site.

Construct Stream Grade Channel

1.81 9570 Item 21101 Road surface saturated of 45'

1.97 10400 End Project Road 460B 0.94 Miles End project at T Junction with skid trails Road continues Ahead End item 21101 Roadway Obliteration Method I

End Seeding – 3.2 Acres