20160005 Ver 1_More Info Received_20161003 (3)

ktwv
WILDLANDS
ENGINEERING
October 3, 2016
Ms. Karen Higgins
NCDENR
Division of Water Resources, 401 & Buffer Permitting Unit
1617 Mail Service Center
512 N. Salisbury St.
Archdale Building — 91h Floor
Raleigh, North Carolina 27699-1617
Subject: Request for Revision to Issued Permit DWR#16-005
Water Quality Certification No. 3885
Wilson Stream Restoration Project
Candler, North Carolina
Dear Ms. Higgins:
Wildlands contacted Zan Price in the DWR Asheville Office about adding an additional 200 linear feet of impact
to the Wilson Stream Restoration Project, DWR#16-005. Mr. Price indicated the following:
At a minimum, the Division of Water Resources (DWR) will need the following for the proposed impact
modification:
1. Revise table 3 on page 4 of the PCN to account for the additional impacts. Please clearly show the extent
of the impacts on an updated plan sheet.
This table and page have been revised and are attached. We have requested a permanent impact to the
tributary for a culvert that will be used for agricultural purposes.
2. Please provide a typical showing how the proposed culvert will meet aquatic life passage requirements.
Provide a brief narrative explaining the purpose of the new culvert and describe measures taken to avoid
and minimize the proposed culvert impact.
,----F-culvert
to be sized to pass 5 -year storm
Bed Material to match constructed riffle
material (mix of Class A/B and sand and
gravel) and be pushed into culvert by hand
Aquatic passage is not a realistic goal given the landscape setting of the proposed culvert and existing
upstream and downstream conditions. However, reasonable efforts are being used to ensure passage
continuity in the restored reach, including through the culvert. A narrative is provided on the revised
Wildlands Engineering, Inc. • phone [phone] • fax [phone] • 167-B Haywood Road • Asheville, NC 28806

page 4 of the PCN. The culvert is necessary for agricultural operations and will allow livestock to be
fenced out of the creek. A crossing location is being selected that minimized tree removal and the
culvert length is being minimized.
3. The plan calls for a Priority 1 restoration. Please provide your range of design values for the proposed
dimension, pattern, and profile of the new channel.
Dimension = 2-3' bottom width, 0.8-1.0' Dmax, bank slopes >=2:1
Pattern shall follow existing alignment, the design is a step -pool design and existing pattern is minimal
Profile shall range from 3-10%. The profile will be raised at the existing driveway culvert approximately
3' to eliminate the existing knickpoint. A stream grade shallower than the valley grade will allow for
transition to a priority 1 (or nested channel with benching) restoration within approximately 50'. This
will allow trees along the banks to be saved and earth moving to be minimized. The last 50' will involve
a series of drops of 0.5 —1.0' down to the mainstem of Little Pole Creek. Little Pole Creek should still
have connectivity to the tributary during high flow events that fill the mainstem channel and back water
into the tributary.
DWR can issue a modified 401 approval after we receive and review the requested information. The applicant
does not have authorization to impact additional waters at this time. Please review the conditions from the
approval letter dated February 2, 2016.
This response is being copied to the US Army Corps of Engineers, NC Wildlife Resources Commission, and
Asheville USFWS office. WRC and USFWS have responded to emails and did not express any likely concerns with
the proposed additional impacts. If you have any questions, please contact me at 828.545.3865 or
[e-mail].
Sincerely,
#I'm- A
Jacob McLean, PE, CFM
Water Resource Engineer
cc: Zan Price (DWR), Andrea Leslie (WRC), Bryon Hamstead (USFWS), William Elliot (USACE), Adam Wilson