20210499 Ver 1_Duke-BlackBear_PCN_Review_Additions_082521_20210811

Duke -Black Bear Campsites (#20210499)
3. Stream Impacts Table (updated 8.25.21)
ID
3a. Reason for impact
3b. Impact
type
3c. Type of
Impact
3d. S.
name
3e. Stream
type
3f. Type of
Jurisdiction
3g. S. width
(average, ft.)
3h. Impact
length (ft.)
S1
Road Crossing
Permanent
Culvert
S-01
Perennial
Corps
3
96
S1-1
Upstream pump -around
Temporary
Coffer darn
S-01
Perennial
Corps
3
10
S1-2
Downstream pump -around
Temporary
Coffer dam
S-01
Perennial
Corps
3
10
S2
Footpath crossing
Permanent
Fill
S-01a
Perennial
Corps
1
5
Rock Armoring and Tread Hardening
Several locations among the trail design of the Black Bear project traverse areas that are frequently wet
due to terraininduced poor drainage, crossing of ravines or draws, sheet flow water run-off from
adjacent roads or roadbeds, adjacent springs or culvert outlets, or stream crossings. Rock armoring with
rock slabs and tread hardening with slabs and/or gravel will be imperative to protect the tread from the
compounding impact of water flow and user -induced soil displacement, subsequently protecting the
natural resources from sedimentation and water quality impact and preventing the development of an
intensive management issue like a muddy quagmire and social trails that develop thereafter in
avoidance. Where available, native stone will be used. Examples of rock armoring and tread hardening
with boulders, stone slabs, and crushed gravel are showcased in photos below.
There is a portion of the trail that crosses the headwaters of a jurisdictional stream (S-01a, shown on the
attached figure). This crossing will be constructed with rock armoring as described above and listed as
impact S2 in Table 3. The portions of the trail leading up to the crossing and beyond the crossing will
be constructed and compacted using small walk behind machinery. Compaction of the trail is vital to
ensuring a stable trail. The rocks for the rock armoring will be placed by hand to reduce disturbance in
the stream. If the rock armoring is unstable, this portion of the trail may be passed over with a plate
compactor to ensure sufficient compaction for trail sustainability.

Duke Energy - Black Bear Campsites PJD - Addition (06/10/21)
Impact Areas (Stream Crossings)
Project Parcel Boundary
Proposed LOD (Road/Culvert Install)
100Contour
McDowell County Parcels (2020)
Rock -armored
foot trail crossing
Proposed Foot Trails
Potential Jurisdictional Resource
*Note: this map is not a survey nor should it be construed as such.
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