20121081 Ver 2_More Info Received_20190607

Homewood, Sue
From: Carrie Caviness <carrie.caviness.1 @gmail.com>
Sent: Friday, June 7, 2019 1:42 PM
To: Leslie, Andrea J
Cc: Homewood, Sue; [e-mail]; Teresa Buckwalter;
[e-mail]
Subject: [External] Middle Fork Greenway Section 4 - Response to Questions
Attachments: MFGSection4_Response to Comments WRC_06.03.2019.pdf, Temporary Stream
Crossing_06.05.2019.pdf, GRADING -EROSION -MFG -Combined Planset_draft_
06.07.2019.pdf, SC 2.pdf, SC 4.pdf, MFG4-Stream Stab_06.05.2019.pdf
External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]
Hello Andrea -
Thanks for making the time to talk earlier this week.
Please find the following attachments related to your questions.
1. MFG4 - Responses to Questions
2. MFG4 Grading and ESC Plan
3. Revised Temporary Stream Crossing Detail
4. Revised Stream Crossing Sheets (SC2, SC4)
5. Revised Streambank Stabilization Plans
Please let me know if you have any questions.
Thanks again,
Carrie
Carrie Caviness, PhD
Interface Environmental Consulting, LLC.
476 Hidden Pond Rd
Boone, NC 28607
[phone]
Qw„°' Virus -free. www.avq.com

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Middle Fork of the New River Morphological Table
Stream Type
C4
Drainage Area
–9.88 square miles
Bankfull Width (ft)
Median: 46.0 ft/Range:
38.6-84.6
ft
Bkf mean depth (ft)
Median: 2.9 ft / Range:
1.6 -
3.0 ft
W/D ratio
Median: 16.1 / Range:
12.7
- 52.6
Area, bkf (sq ft)
Median: 131.8 sq ft / Range:
117.5
- 136.2 sq ft
max depth bkf (ft)
Median: 4.1 ft / Range:
3.1-
4.6 ft
d-max/d-bkf
Median: 1.4/ Range:
1.4-1.9
Width, fpa (ft)
Median: 121 ft / Range:
115 -
161 ft
Entrenchment Ratio
Median: 2.5/ Range:
1.9-
3.1
Avg. Slope
0.002
D50 (mm)
–19 mm
SEQUENCE OF CONSTRUCTION
• Establish Temporary Stream Crossing(s) and
Staging Area for Structure Materials.
• Install J -Hook #1 and stabilize disturbed areas.
• Remove bar at Station 0+40 - 0+60. Stockpile
removed material for backfilling at Toe Wood
Structures.
• Install Toe Wood Structures and stabilize
disturbed areas.
• Install J -Hook #2 and build adequate slope to
bankfull elevation behind structure with use of
excavated scour pool material.
• Install Boulder Toe Structure. Stabilize all
remaining disturbed areas and temporary stream
crossings.
• Plant Tree and Shrub Species.
• Work Timeframe April 15th - October 15th.
• *If selected Contractors are not experienced in
Streambank Stabilization structures - provide
Construction Oversight from an experienced
Party.
Temporary Stream
Crossing for Construc 'on
Equipment/Materi s
i
i
O
' O
/'D�
River Thalweg
Remove Bar Feature To
Adjacent Ex. Streambed Elevation
CIVIC S T U D I O
0
+
0
PROPERTY OWNER
Truman Critcher
Deed Bk 1274, Pg 362
PIN: 2819848694000
5.85 acres
�J
1:2
1+00
0)
N
J -HOOK #2
—36'5 7% slope
S e LongPro for plac ent.
0)
CP
4DT
Nx
N
U0
STREAM DIVERSION NOTES & SPECIFICATIONS
• All efforts shall be made to divert thalweg streamflow from the bank work
areas including Toe Wood, J -Hook Sill Tie-in, and Boulder Toe
Stabilization.
• Contractor should establish a coffer dam from the streambank upstream
of the bank work area using either sandbags or concrete highway divider
structures.
• No pumping within the coffer dam work area is required.
'/D
rNq�G
BOULDER- OE
BA STABILIZATIO
WORK ARES
J -H OK #1
—4 ', 5% slope
Se gPrd for placeme
/
TO WOOD
BANK TABILIZATION
/
i
PROPERTY OWNER
Watauga County
Deed Bk 2002) Pg 897
PIN : 2819920325000
12 acres
' PROPERTY OWNER
Brian and Lori Tolbert
Deed Bk 868, Pg 616
PIN: 2819838597000
1.03 acres
Install sand bag or concrete
divider coffer dam to 3' (min) above
streambed elevation. Alternate
sandbag overlap at each course.
I I
I
Use Excavated River Cobble
From J -Hook 2 Scour Pool To
Build J -Hook Slope to Bkfl Elevation
Use Excavated River Cobble
From J -Hook 2 Scour Pool To
Build Slope to Bkfl Elevation
PROPERTY OWNER
Donovan Phillips
Deed Bk 1637, Pg 643
PIN: 2819839808000
1.285 acres
Boone, NC 28607
Ph: 919.656.4543
CIVIC STUDIO
rr_'�
M ��� \.J / \ I
Boone, NC 28607
Ph: 828.719.0177
MIDDLE FORK GREEf'IWAY
SECTION #4
STF'EAMBANK STABILIZATION
Project #: MFG Section #4 Streambank Stabilization
Drawn By: Carrie Caviness
Checked By: Teresa Buckwalter
Scale: 1" = 10' — 0"
Issue Date
1 4/15/2019
2 4/16/2019
3 6/05/2019
Drawing Title:
PLAN
Seal:
Property Lines and Pins
Name: Teresa Buckwalter
Profession: Landscape Architect
License No.: 1702
LEGEND
1' CONTOUR
5' CONTOUR
FEMA FL❑❑DWAY
- FEMA 100YR
BANKFULL
- TROUT BUFFER (25')
- J -HOOK STRUCTURE
- TOE WOOD STRUCTURE
® - BOULDER TOE STRUCTURE
20
40
Feet
Drawing No.:
4Z
d + SL

M
CD
O�
3308
3304
3300
3296
3292
3288
3284
-0+25
XSEC-1, STA 0+93
0+00 1+00 2+00
M Existing Grade
3304
3300
< 3296
3292
3288
Q 3284 Banktull Elev.
-0+25 0+00
M
CD
00
0
3304
3300
3296
3292
3288
3284
-0+25
LIVE STAKES
(2 dia. or greater)
2:1 SLOPE
OR FLATTER
6" COVER
ON FABRIC
BACKFILL WITH
NATIVE GRAVEL
3BLE
Station
XSEC-211 STA 1+55
3308
3304
3300
3296
3292
3288
3284
2+25
Build toe wall to bankfull
on river right to protect
actively degrading bank adj.
to proposed MF Greenway
3304
3300
3296
3292
3288
3284
Longitudinal Profile: 'Malweg
0
50
100 150
Longitudinal Station (ft)
Boulder I oe PERMANENT SEED MIX:
1+00 2+00 2+25 APPLY AT 15 LBS PER ACRE OF DISTURBANCE (per specifications of seed supplier):
ERNST CONSERVATION SEED MIX ERNMX-178 (FLOODPLAIN MIX) WHICH INCLUDES
Station THE FOLLOWING SPECIES:
Fox Sedge, Partridge Pea, Dear Tongue, Little Bluestem, Virginia Wild Rye, Riverbank
Wild Rye, Swamp Sunflower, Ox Eye Sunflower, Arrow Wood, Big Bluestem, Silky
XSEC-3, STA 2+00 Dogwood, Switchgrass, Indiangrass, Staghorn Sumac, Showy Tick Trefoil, Purple
Slope to BKFL Elevation Bergamot, Black Eyed Susan, Joe Pye Weed , Soft Rush, Giant Ironweed, Tall White
1+00 �
Station
TION BOULDER
3304 Beard Tongue, Spotted Joe Pye Weed, Bone Set, and Blue False Indigo.
3300 TEMPORARY SEED MIX AND SPECIFICATIONS:
3296
3292
_ 3288 Common Name Scientific Name Rate per Acre Optimal Planting Dates
3284 Rye grain Secale cereale 30 lbs Aug 15 - May 15
Boulder Toe Bank Stabilization Browntop millet Urochloa ramosa 10 lbs May 15 - Aug 15
2+00 2+25 Seedbed Preparation:
- J -Hook 2 (-12' downstream of header rock) Disturbed soils within riparian areas will be amended to provide an optimum
environment for seed germination and seedling growth. Surface soils will be loose
enough for water infiltration and root penetration. Lime will be added to the soil to
ensure a pH level between 5.5 - 7. Fertilizer (18-46-0) will be added to nutrient
deficient areas. All riparian areas will be raked to loosen compacted soil prior to
seeding.
UNDISTURBED
1. �N S AMBEE \\/ (� -SCOURED BANK -
e a low bank or bankfull FOOTER ROCK(S)_
j\\/� /\ /. ing on entrenchment.
A -A LOW FLOW WATER SURFACE
CROSS-SECTION GEOTEXTILE
FABRIC
LOWER TIER OF BOULDER TOE TO BE
PLACED AT OR BELOW THALWEG ELEVATION
MATERIAL NOTES:
3293.00
3292.50
3292.00
2'-3' WIDE, AND X-5' LONG.
3291.50
ROCK SHALL BE NATIVE STONE HARVESTED LOCALLY OR
3291.00
FROM EXISTING STREAM.
A A 3.
C
.�0
3290.50
CENTERS. ALLOW 12" OVERLAP ON MATTING EDGES.
THE ROCK TO ROCK CONTACT. THE ROCK TO ROCK
v
b
CONTACT SHOULD BE SOLID.
3290.00
r 1.
3289.50
2.
3289.00
3288.50
SUITABLE RECESS.
388 00
Longitudinal Profile: 'Malweg
0
50
100 150
Longitudinal Station (ft)
Boulder I oe PERMANENT SEED MIX:
1+00 2+00 2+25 APPLY AT 15 LBS PER ACRE OF DISTURBANCE (per specifications of seed supplier):
ERNST CONSERVATION SEED MIX ERNMX-178 (FLOODPLAIN MIX) WHICH INCLUDES
Station THE FOLLOWING SPECIES:
Fox Sedge, Partridge Pea, Dear Tongue, Little Bluestem, Virginia Wild Rye, Riverbank
Wild Rye, Swamp Sunflower, Ox Eye Sunflower, Arrow Wood, Big Bluestem, Silky
XSEC-3, STA 2+00 Dogwood, Switchgrass, Indiangrass, Staghorn Sumac, Showy Tick Trefoil, Purple
Slope to BKFL Elevation Bergamot, Black Eyed Susan, Joe Pye Weed , Soft Rush, Giant Ironweed, Tall White
1+00 �
Station
TION BOULDER
3304 Beard Tongue, Spotted Joe Pye Weed, Bone Set, and Blue False Indigo.
3300 TEMPORARY SEED MIX AND SPECIFICATIONS:
3296
3292
_ 3288 Common Name Scientific Name Rate per Acre Optimal Planting Dates
3284 Rye grain Secale cereale 30 lbs Aug 15 - May 15
Boulder Toe Bank Stabilization Browntop millet Urochloa ramosa 10 lbs May 15 - Aug 15
2+00 2+25 Seedbed Preparation:
- J -Hook 2 (-12' downstream of header rock) Disturbed soils within riparian areas will be amended to provide an optimum
environment for seed germination and seedling growth. Surface soils will be loose
enough for water infiltration and root penetration. Lime will be added to the soil to
ensure a pH level between 5.5 - 7. Fertilizer (18-46-0) will be added to nutrient
deficient areas. All riparian areas will be raked to loosen compacted soil prior to
seeding.
UNDISTURBED
1. �N S AMBEE \\/ (� -SCOURED BANK -
e a low bank or bankfull FOOTER ROCK(S)_
j\\/� /\ /. ing on entrenchment.
A -A LOW FLOW WATER SURFACE
CROSS-SECTION GEOTEXTILE
FABRIC
LOWER TIER OF BOULDER TOE TO BE
PLACED AT OR BELOW THALWEG ELEVATION
MATERIAL NOTES:
DESCRIPTION
ROCK DIMENSIONS SHALL BE APPROXIMATELY 1'-2' THICK,
t1.
2'-3' WIDE, AND X-5' LONG.
O2.
ROCK SHALL BE NATIVE STONE HARVESTED LOCALLY OR
i J n
FROM EXISTING STREAM.
A A 3.
THE ROCKS SHOULD BE RECTANGULAR OR NEARLY SO AT
CENTERS. ALLOW 12" OVERLAP ON MATTING EDGES.
THE ROCK TO ROCK CONTACT. THE ROCK TO ROCK
4. LIVESTAKE SPECIES INCLUDE BUT ARE NOT LIMITED TO:
CONTACT SHOULD BE SOLID.
CONSTRUCTION NOTES:
r 1.
CONSTRUCTION SHOULD BEGIN AT LOWEST POINT OF SLOPE.
2.
EXCAVATE THE MINIMUM AMOUNT OF MATERIAL TO PROVIDE
SUITABLE RECESS.
3.
AS TOE PROTECTION IS BUILT, LAYERS WILL BE PLACED TO
7
I
REMOVE ANY UNSTABLE
COVER AT LEAST 3'S OF THE FOOTING BOULDER AND
WOODY DEBRIS
OVERLAPPED TO MINIMIZE GAPS.
AND PRESERVE WELL 4.
NON -WOVEN GEOTEXTILE SHALL BE PLACE BEHIND ALL
ROOTED VEGETATION
BOULDER LAYERS BEFORE NATIVE STONE BACKFILL IS
PLACED BEHIND THE BOULDER.
5.
STABILIZE THE BACKFILL TRENCH AND ANY SLOPED AREAS
WITH TEMPORARY AND PERMANENT SEED WITHIN 1 DAY OF
CONSTRUCTION.
6.
PLACE AND STAKE WOVEN JUTE (COCONUT) FIBER MATTING
BOULDER TOE BANK STABILIZATION
ON TOP OF SEEDED DISTURBED AREAS AND REVEGETATE
Detailed Plan
PER PLANS.
STONE AND COBBLE
ACE ROCK
2%-1%
MATERIAL NOTES:
1. ROCK DIMENSIONS SHALL BE APPROXIMATELY 2'
THICK, 2'-3' WIDE, AND 3'-5' LONG.
2. ROCK SHALL BE NATIVE STONE HARVESTED
LOCALLY OR FROM EXISTING STREAM.
3. THE ROCKS SHOULD BE RECTANGULAR OR NEARLY
SO AT THE ROCK TO ROCK CONTACT. THE ROCK
TO ROCK CONTACT SHOULD BE SOLID. IF ROCKS
ARE NOT PERFECTLY FLAT, THE THICKER END
SHOULD BE PLACED DOWNSTREAM.
CONSTRUCTION NOTES:
1. THE LOWER ROCK (HEAD ROCK) FOOTER WILL
FIRST BE PLACED FOLLOWED BY THE HEAD
ROCK TO SET THE INITIAL STRUCTURE
ELEVATION.
2. THE SUBSEQUENT ROCK (MOVING UPSTREAM)
AND ASSOCIATED FOOTERS WILL THEN BE SET
SIGHTING THE PROPOSED 20-300 BANK
DEFLECTION LINE.
3. ROCK PLACEMENT FOLLOWS MOVING UPSTREAM
ATA 2-7% SLOPE UNTIL A BANKFULL ELEVATION
IS REACHED AT THE END OF THE STRUCTURE
WING.
4. A ROCK SILL WILL THEN BE CONSTRUCTED
PERPENDICULAR TO THE STRUCTURE ANGLE TO
PREVENT THE FORMATION OF A CUTOFF
CHANNEL.
5. A TRENCH SHALL BE DUG UPSTREAM ON THE
BANKSIDE OF THE WING WHERE NON -WOVEN
GEOTEXTILE FABRIC WILL BE PLACED WITH
APPROX. 2' OF OVERLAP
6. BACKFILL TRENCH WITH NATIVE MATERIALS AND
RE -VEGETATE.
CROSS-SECTION
NOTE:
DETAIL BASED ON SIMILAR
DETAIL BY ROSGEN.
WILOLAND HYDROLOGY,
SCOUR POOL,
PROFILE
200-300 <_
13
F�
B�
13
POOL
CUT OFF SILL
Min. 15' Length
GAPS IN HEADER ROCK
1/4 TO 1/3 ROCK
DIAMETER IN HOOK
B
(TYP)
(TYP)
NON-WOVEN-J
GEOTEXTILE Q
FABRIC
ROCK J -HOOK VANE STRUCTURE
DETAILED PLAN
GLIDE
CUT OFF SILL
Min. 15' Length
200
19
250
Berm and trench
Cross-section
Berm and trench
ti S:1
slope F CLASS A STONE titea�Z
ksr, Mid Range 4" cis dope
9stP �*sem N 5•.15
Geotextile fabric des
10116
n
2:1 side slopes
Anchor pins 3 ft on center
Notes:
CLASS A STONE 1) Geotextile fabric shall be non -woven material with a minimum tensile
MidRange 4" strength of 150 lbs and a minimum weigh tof 6 oz per square yard.
2) When one than one width of geotextile is required, the downstream panel
shall be installed first.
3) Anchoring pins (12-15 in) shall be placed through the geotextile in all
excavated trenches, overlapped fabric and across the width of the channel on 3
ft centers.
4) Stone surfacing shall be no higher than the lowest point in the stable natural
I channel. Surfacing material shall consist of crusher run aggregate (ABC stone).
2:1 side slopes 5) Surfacing material will be spread such that a minimum of 6 in of cover
exists on the geotextile before tracked equipment is operated over it.
6) Start at existing toe and extend the flat portion of the crossing into the
bank 2 ft before starting the minimum 5:1 slope up and out of the stream
channel.
Edge of Water
7) Surface runoff shall be diverted around the entrance and exit slopes to
prevent erosion of surfacing materials.
8) Excavated side slopes on entrance and exit ramps shall have a slope of 2:1
i or flatter. Sideslopes shall be stabilized with CM700 (Excelsior) or equiv. upon
installation of stream crossing. Fabric may be underseeded if permanent grass
cover is preferred, or removed and streamside vegetation restored after
removal of the stream crossing.
Plan View 9) In stream floor where course rock and/or gravel exist, no crusher run
aggregate will be used to line low flow channel bottom.
10) Remove all materials (geotextile, stone) from temporary crossing after
use.
Temporary Stream Crossing (Ford) Installation Detail
GREENWAY FOOTPRINT
SYMBOL
DESCRIPTION
1. FOLLOWING CONSTRUCTION, SEED AREA WITH TEMP. AND
PERMANENT GRASS/HERB MIXTURE.
2. MAT WITH WOVEN JUTE EROSION CONTROL FABRIC
(EXCELSIOR CM700 OR EQUIV.)
3. MATTING AND FABRIC ARE TO BE STAKED DOWN WITH LARGE
STAPLES (6" MIN.) AND/OR WOODY LIVESTAKES ON 3'
CENTERS. ALLOW 12" OVERLAP ON MATTING EDGES.
4. LIVESTAKE SPECIES INCLUDE BUT ARE NOT LIMITED TO:
Cornus amomum, Physocarpus opulifolius, Salix serecia,
Sambucus canadensis.
SYMBOL DESCRIPTION
NATIVE TREE AND SHRUB (3
GAL CONTAINERS) SPECIES TO
BE PLANTED AT A DENSITY
SUFFICIENT TO PROVIDE 400
TREES/ACRE AT MATURITY
-FLOODPLAIN SPECIES INCLUDE
BUT ARE NOT LIMITED TO:
Acer rubrum, Amelanchier
arborea, Betula nigra, Ilex
spp., Juglands nigra,
Liriodendron tulipifera, Malus
coronaria, Physocarpus
opulifolius, Quercus rubra, etc.
TYPICAL STABILIZATION AND RE -VEGETATION PLAN VIEW DETAIL
1/2 B
Wbkf ROOT WA 3:1 Slope or Less
A -A
CROSS-SECTION
PROPOSED BANK BENCH
-�
\ FOOTER LOG
FILLER LOGS, TOPS, LIMBS,
BRUSH, AGGREGATE, SOIL
200-300
FO TER LOG (TYP)
S
FLOWS
Boone, NC 28607
Ph: 919.656.4543
M1 \'J
CIVIC STUDIO
Boone, NC 28607
Ph: 828.719.0177
M DDEE FORK CREENWAY
SECT ON #4
NTREAMBANK STAB E ZAT ON
Project #: MFG Section #4 Streambank Stabilization
Drawn By: Carrie Caviness
Checked By: Teresa Buckwalter
Scale: 1" = 10' - 0"
Issue Date
1 4/15/2019
2 4/16/2019
3 6/05/2019
Drawing Title:
DETALS
Seal:
Name: Teresa Buckwalter
NOTES: /// // Profession: Landscape Architect
1. A TRENCH SHALL BE DUG ALONG THE TOE OF / j j// j License No.: 1702
THE BANK TO A DEPTH OF THE DIAMETER OF THE
FOOTER LOG.
2. A PRUNED FOOTER LOG SHALL BE PLACED AT ROOT WAD (TYP)
THE TOE OF THE CHANNEL AND THE ROOT WAD
SHALL BE PLACED DIRECTLYABOVE IT.
3. THE VELOCITY VECTORS OF THE STREAM IN THE
CHANNEL ARE ALIGNED WITH THE TRUNKS
LONGITUDINAL AXIS AND WILL INTERSECT THE
ROOT MASS AT A 90 DEGREE ANGLE.
4. A BOULDER MAY BE PLACED ON THE
DOWNSTREAM SIDE, ON TOP OF, AND ON THE
UPSTREAM SIDE BETWEEN THE ROOTMASS AND
THE BANK TO PROVIDE EROSION CONTROL.
5. ROOTWAD LOGS SHALL BE AT LEAST 15' IN
LENGTH AND HAVE A MINIMUM DIAMETER AT
BREAST HEIGHT (DBH) OF 12". USE OAK OR
CHERRY SPECIES FROM ON-SITE CLEARING. NO
EVERGREENS" TOE WOOD BANK STABILIZATION Drawing No.:
6. SHALLOW -ROOTED RATHER THAN DEEP-ROOTED TREE Detailed Plan
SPECIES WITH RATIOS OF ROOT FAN DIAMETERS TO
BOLE DIAMETERS OF 4.0 OR GREATER ARE
PREFERRED; AVOID NARROW BASED, FAN DIAMETER
RATIOS LESS THAN 3.0.
CA Rid
���� • � � • zx aid
p ,15
. �{�• • - r
• r
A:
V
I'' 13 U
fillllill
SS 2

*NOTE FROM CONSULTANT ON SECTION 4h of APPLICATION
The greenway is proposed as a combination of 10' paved trail and elevated boardwalk.
The trail was previously described as a combination of gravel trail, slope deck (now
referred to as elevated boardwalk), and boardwalk.
**ATTACHMENTS
1) Grading and ESC Planset
2) Revised Temporary Stream Crossing Detail
3) Revised Stream Crossing #2 and Stream Crossing #4 Plan Sheets with culvert
information.
4) Revised Streambank Stabilization Planset with Diversion Detail
1. Where is the greenway in relation to the Middle Fork New River along the 4275'
stretch (how far away from the river is it?)?
I have attached a complete grading and Erosion and Sediment Control Planset for
reference. The Trout Buffer is highlighted on this planset. The greenway parallels the
MFNR on river right. Wherever possible, the greenway is located greater than 25' from
the Top of Bank. All attempts were made to design the greenway alignment in order to
avoid the floodway and trout buffer adjacent to the "river right" streambank. The
alignment was constrained in places by severely steep (and sometimes unstable)
hillslopes and maximum trail profile slopes (5% max) for ADA compliance. The greenway
corridor is 10' wide (ADA compliant). Cut and fill measures were avoided on steep slopes
to the greatest extent possible — retaining walls and elevated boardwalk sections are used
throughout (see Site Plans).
There are several sections where the MFNR edge of water abuts very steep side slopes
and the greenway is located entirely or partially within the 25' buffer. These areas are
listed below; buffer encroachment is between 2-10' in these sections. A Trout Buffer
Waiver application is being submitted to NCDEQ DEMLR Winston Salem office along with
the project's ESC plan.
STA 3+25 — 4+50 — paved trail
STA 4+50 — 7+00 — elevated boardwalk
STA 15+25 — 21+25 — paved trail
STA 29+15 — 32+50 — elevated boardwalk
STA 40+35 — 43+20 — paved trail
2. Why is a temporary crossing needed for the Middle Fork of the New River for
the stabilization section?
The Greenway will be constructed linearly along the project corridor. A long section of
boardwalk is located adjacent to the streambank stabilization section. Materials will be
imported to the site for both these efforts. Instead of trucking materials along the narrow
greenway corridor for construction; the temporary stream crossing is proposed to
efficiently move the stone and planting materials necessary for the stabilization and

structural materials for the boardwalk to the construction areas. This area is also easily
accessible for dump trucks from US Hwy 321. It is an already stable gravel parking lot and
pull off.
3. Will the stone used for the temporary crossings be removed once the crossings
are no longer needed?
Yes. As stated in the detail notes (#8), the geotextile fabric and stone shall be removed
once crossings are no longer needed. We have emphasized this statement and I am
attaching an amended detail.
4. The PCN states that the UT to Elrod Br will be culverted with a 24" HDPE
culvert, but the photo sheets state that it will be crossed with an arch culvert. Which
is it? We much prefer an arch culvert.
The two proposed culverts at SC2 and SC4 have been revised to arch culverts. Amended
plans are attached.
5. Likewise, is it possible to change the UT to Middle Fork New 36" HDPE culvert
to an arch culvert? What length will the impact be (it's stated that it'll be 18 ft in the
text and 24 ft in the impact table).
The impact length for SC4 culvert crossing at UT-MFNR2 is 24'. This is an error in the
application and Amanda Jones (USACE) and Sue Homewood (NCDEQ) are copied on this
response. The impact table is correct.
We also recommend against using HDPE material for culverts, as it is difficult for
aquatic animals to move through these slick culverts.
Both culverts have been revised from HDPE pipes to arch culverts.
6. For the Middle Fork South Fork New River stabilization:
a. Will you be sloping the banks? If so, at what slope?
The slopes proposed are 3:1 or flatter behind Toe Wood Stabilization, as noted on
the Streambank Stabilization Detail Sheet. The slope proposed are 2:1 or flatter
behind Boulder Toe Stabilization, similarly noted. As shown in X-SEC2 on the
Detail sheet, the streambank where the Boulder Toe is proposed is a low, vertical
bank with gently sloping floodplain behind it. The Toe is proposed to the near top
of this low bank, so sloping will be minimal.
b. Can you isolate the work areas from the thalweg using a coffer dam? This
is important especially at bank work areas — e.g., toe wood, j -hook tie ins,
boulder toe.
A diversion detail (per our conversation on 06/05/2019) has been included in the
streambank stabilization plan set.

c. Will you be working from the bank or from within the river itself?
We will be working from the "river right" streambank to install the Toe Wood, J-
Hooks, and Boulder Toe structures. To install the header rocks and cut-off sill for
the J-Hooks, work will be performed from "river left". It may be necessary to
move machinery down the "arm" of the J-Hooks to install the footer rock
underlying the header rock. The proposed Temporary Stream Crossing at this area
will be used to work from both sides of the bank and avoid machinery in the
streambed to the greatest extent practicable.

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