20201842 Ver 2_More Info Requested_20210715

Strickland, Bev
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Sullivan, Shelton
Thursday, July 15, 2021 2:49
[e-mail]; Trone,
Wojoski, Paul A
Cleveland Bluffs Restoration
Cleveland Bluffs Restoration
PM
Rick V; 'Hopper, Christopher D CIV (USA)'
Plan - More Info Requested
MorelnfoNeeded_SS 7-15-21.pdf
David,
Please see the attached information requested regarding the restoration plan.
Regards,
Shelton Sullivan
NC Division of Water Resources
401 & Buffer Permitting Branch
shel ton.sullivan @ncdenr. gov
919-707-3636 office
919-239-0238 current cell phone

Cleveland Bluffs Restoration Plan
DWR Comments and Request for Additional Information for DWR Review, Shelton Sullivan 7-15-21
1. Restoration of 456 linear feet of UT1 is to resolve the violation of the piping and earthen fill of UT1.
This restoration should not count toward any mitigation requirements of the permitting process.
Please clarify this restoration plan and the mitigation that is proposed in the 401 Water Quality
Certification Application.
2. DWR requires more of a natural channel design for this stream restoration including the following
items.
3. Channel Design
a. Please provide modeling data or other calculations to support proposed channel depth given the
20-acre drainage area. Reduce the depth as much as possible, at least in the riffle sections of the
stream to allow access to the adjacent floodplain.
b. The current gravel bottom channel design is not a natural stream restoration design. The stream
restoration design should include bedform diversity (i.e., riffle — pool sequence). Riffle material
should be appropriately sized to handle calculated discharge velocities. Additionally, adding
rock/wood structures for grade control and bank toe protection should be considered for long-
term stream stabilization and aquatic habitat. The channel bottom design width should be
detailed on the typical cross section provided or with an additional drawing. Please include other
standard stream design values such as sinuosity, bank full cross -sectional area, width/depth ratio,
bank height ratio, and entrenchment ratio.
c. Any matting in the stream bed and banks should not consist of geotextile material but rather a
coir matting or other biodegradable material.
4. Vegetation
a. Stream restorations require woody stem plantings with live stakes (shrub and/or trees) for long-
term stream stabilization, habitat and water quality.
b. Provide two rows of live stakes, spaced approximately 8-10 feet apart, to be installed along the
mid/upper bank slope.
c. Provide at least one row of bare root (or container) plantings be installed approximately 3-6 feet
back from the top of bank and spaced 8-10 feet apart.
d. All plantings should be planted in the upcoming dormant season for the specific ecoregion (2021-
2022)
e. Please modify the permanent and temporary seeding plans that account for the woody stems and
specific seed mix to be used.
5. Irrigation
a. To ensure survival, please utilize the pond or other water source for irrigation of the restoration
plantings during the first growing season.
6. Monitoring
a. Once restoration is completed, send confirmation to DWR, Shelton Sullivan
[e-mail] and Paul Wojoski at [e-mail].
b. The restoration area should then be monitored quarterly for the first year and then annually for
a total of 5 years as specified in the proposal. Send the monitoring reports with photographs
quarterly for the first year and then by November 30 of the following years. Send the reports to
Shelton Sullivan [e-mail] and Paul Wojoski at [e-mail].

c. The monitoring criteria should include:
i) In addition to the criteria in the proposal, choose at least two cross sections (1 riffle, 1 pool)
to track aggradation, degradation. and bank scour.
ii) In addition to the criteria in the proposal, choose at least two vegetation plots/transects to
track species, coverage, stem density and vigor.
d. Replant as need to meet the required success criteria. If replanting is required, the monitoring
will restart as well.
e. Monitoring requirements can be reduced in writing by DWR.
7. Success Criteria
a. Channel must be stable, and repairs made if needed during the monitoring period.
b. Success criteria of the stream bank stabilization will be accomplished when 90% of the bank is
observed to stable with no signs of ongoing erosion.
c. Success criteria of the vegetation will be accomplished when 90% of the planted stems survive
with 90% vegetative cover of the restored area.