20200463 Ver 1_PCN Cover Letter_FINAL_2020-04-07_20200407

fto WithersRavenel
.. Our Peopte. Your Success.
April 7, 2020
US Army Corps of Engineers NC -Division of Water Resources
Wilmington Regulatory Field Office 401 & Buffer Permitting Unit
Ms. Emily Thompson Mr. Paul Wojoski
69 Darlington Avenue 1617 Mail Service Center
Wilmington, NC 28403 Raleigh, NC 27699
Re: Kinston - Sand Clay Rd Culvert Replacement
NWP 3 PCN & Buffer Authorization Submittal
Kinston, Lenoir County
WR Project #02180652.10
Dear Ms. Thompson and Mr. Wojoski,
On behalf of the City of Kinston, we are requesting authorization from the USACE to use an NWP
3 for 96 If of temporary stream impacts associated with the replacement of the existing culvert on
Sand Clay Road in Kinston. We believe the proposed project meets conditions for a non -notifying
NWP 3, and therefore this application is being provided to the USACE as a courtesy.
We are requesting a 401 Water Quality Certification from NCDWR for the above referenced
impacts, as well as a Neuse River Riparian Buffer Authorization for 1,044 sf of permanent Zone 1
buffer impacts and 5,923 sf of temporary Zone 2 buffer impacts.
The project is ±0.5 acres in size and is located on Sand Clay Road, approximately 500 If east of the
western terminus of Sand Clay Road (entrance to Barnet Park) in Kinston, Lenoir County (Latitude:
35.276492°N; Longitude:-77.640347°W). The project is located on two parcels (PINS:
450502598020; 450502584341) owned by the City of Kinston.
The project is located in the Neuse Fear River basin and onsite waters drain to the Neuse River.
The Water Quality Classification for the Neuse River is C;NSW, and the Stream Index Number is:
27-(75.7). The HUC for the site is 030202020206.
Proposed Project
The purpose of the proposed project is to replace the existing culvert, which has a joint that has
failed and is causing a sinkhole on the western side of the road. The project consists of
replacement of the existing 84" CMP culvert with an 84" GA aluminum culvert. The culvert
replacement has been designed within the exact footprint of the existing culvert. There is an
existing inlet structure on the upstream (northern) that will remain and will not be replaced.
Additionally, the existing rip -rap dissipator is undersized and not functioning properly which will
be replaced with a constructed plunge pool. The plunge pool has been designed within the same
footprint as the existing rip -rap dissipator within the stream.
219 Station Road, Suite 1011 Wilmington, NC 28405
t: 910.256.9277 www.withersravenel.com I License No. C-0832
Asheville I Cary Greensboro I Pittsboro I Raleigh I Wilmington

Sand Clay Road Culvert Replacement - Kinston, Lenoir Co. 14■ withers Rave n e l
r. Our People. Your Success.
In order to conduct work in the dry, rip -rap coffer dams will be installed upstream and downstream
of the culvert, and flow will be pumped around the construction area (see Bypass & Erosion
Control Plan in Impact Exhibits). On the upstream end of the project area, the existing intake
structure will be blocked by using plywood to block the intake orifices, with a large rip -rap coffer
dam used to hold the plywood in place. The large rock coffer dam will also be used to construction
access once the existing culvert has been removed. During construction of the plunge pool, the
area will be dewatered by pumping water out of the plunge pool area, which will be pumped
through a sediment filter bag. Both the stream flow bypass and dewatering flow will be discharged
into a temporary discharge apron, which will dissipate flow before flowing into the stream. A
temporary rock dam will be installed within the stream downstream of the discharge apron, which
will provide additional sediment removal to prevent turbidity issues downstream of the project
area.
The rip -rap within the plunge pool has been designed to embed the rip -rap such that the top of
the rip -rap matches the preconstruction contours of the channel, allowing for passage of aquatic
life and preventing a function loss of this section of stream.
The project will be constructed using traditional commercial construction equipment and
techniques.
Project History
WithersRavenel reviewed the project area in January 2020 and determined that there are no
wetlands within the project area. The only jurisdictional feature within the project area is the
perennial stream in which the culvert is located. Please note that we are not requesting issuance
of a Jurisdictional Determination, as the project consists of maintenance of an existing structure.
The perennial stream is depicted on both the USGS and Soil Survey, and subjectivity to Neuse
River Riparian Buffers is conceded. Therefore, a formal buffer determination from NCDWR was
not required.
Proposed Impacts
The proposed impacts consist of 96 If of temporary stream impacts.
Impact 1 (14 If) and Impact 3 (17 If) will result from installation of temporary rock coffer dams for
stream flow bypass, dewatering and sedimentation control during construction, which will be
removed after construction is complete.
Impact 2 (65 If) will result from removal of the existing rip -rap dissipator and construction of the
proposed plunge pool. The rip -rap within the plunge pool will be installed by burying the rip -rap
such that the top of the rip -rap matches the preconstruction contours of the streams, allowing for
the passage of aquatic life and preventing a function loss of this section of stream.
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Sand Clay Road Culvert Replacement - Kinston, Lenoir Co. 14■ Withers Rave n e l
r. Our People. Your Success.
During construction, 5,923 sf of temporary Zone 1 buffer impacts (Impact 4) will occur. Upon
completion of construction, the buffers will be vegetated with a riparian seed mix to provide
temporary stabilization until natural recruitment permanently re -vegetates the buffer.
The construction of the proposed plunge pool will result in 1,044 sf of permanent Zone 1 buffer
impacts, which is classified as an "Allowable" use for perpendicular road crossings in the Neuse
River Basin Riparian Buffer Rules Table of Uses.
Avoidance and Minimization
The project consists of replacement of an existing culvert, and therefore impacts to streams and
riparian buffers could not be avoided.
Stream impacts have been limited to only those temporary impacts necessary for replacement of
the culvert, installation of a plunge pool within the footprint of the existing rip -rap dissipator, and
coffer dams necessary for stream flow pump around and sedimentation control.
Permanent riparian buffer impacts have been minimized to only those necessary to construct the
proposed plunge pool.
Temporary riparian buffer impacts have been minimized to only those necessary for replacement
of the culvert, temporary coffer dams for stream flow bypass and sedimentation control and
temporary discharge apron for stream flow pump around and dewatering flow discharge.
Access during construction will occur from uplands. Silt fencing will be installed around all
disturbed areas to prevent loss of sediment into adjacent waters.
Mitigation
All proposed stream impacts are temporary and associated with maintenance of an existing
structure, and therefore mitigation is not proposed.
All proposed riparian buffer impacts are associated with a perpendicular road crossing, which is
classified as "Allowable" in the Neuse River Basin Riparian Buffer Rules Table of Uses.
The current request is for 96 If of temporary stream impacts,1,044 sf of permanent Zone 1 buffer
impacts and 5 and 5,923 sf of temporary Zone 1 buffer impacts (see the attached maps and PCN
for details).
Please feel free to call if you have questions or require additional information.
Sincerely
WithersRavenel
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Sand Clay Road Culvert Replacement - Kinston, Lenoir Co. 4■ WitherSRavene l
N. our People. Your Success.
Troy Beasley
Senior Environmental Scientist
Attachments:
• PCN Form
• Agent Authorization
• Parcel/Owner Information
• Aerial Photo
• Stream/Buffer Exhibit
• USGS Quads
• Lenoir County Soil Survey
• NCNHP Project Review Letter
• USFWS T&E List for Lenoir County
• Impact Exhibits
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