_External_ RE_ perched pipe R-5768 US 311 (South Main Street)

Carpenter, Kristi
From:
Brumagin, Stephen A (Steve) CIV USARMY CESAW (USA)
<[e-mail]>
Sent:
Friday, March 15, 2024 1:24 PM
To:
Braquet, Stephanie; Conchilla, Ryan
Cc:
Jones, Scott A; Dale Swicegood; Euliss, Amy
Subject:
[External] RE: perched pipe R-5768 US 311 (South Main Street)
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Stephanie,
Thanks for the photographs, they were helpful. The project plans don't capture the downstream rock "falls" and that is
important for the discussion of connectivity. I would agree that this culvert provides a hydrologic connection for what is
shown on the project plans as wetlands on the south side of the railroad and its function is to equalize surface water
flow from the wetland area to the tributary below the culvert.
As for what to do with the outlet of your culvert, I would say that installation of a dropbox/outlet would likely be
considered additional impacts, require a permit/modification, and will place more of the stream into a structure. As an
alternative, you indicated that NCDOT could create a rock dissipator/plunge pool below this culvert. NCDOT is
authorized to place rock at the outlet of this structure (approx. 10 If) to protect the banks. If a rock energy
dissipator/rock/native material -rock can be placed within this location, into the stream bed within the existing scour
area to prevent further erosion/sedimentation (not just rock dumped into the scour up to Ordinary High -Water Mark), I
believe that would not constitute a loss of waters and would be a minor alteration and would not require permit
modification. Please let me know if you have any questions. Thanks.
Stephen A. Brumagin
NCDOT Project Manager
U.S. Army Corps of Engineers,
Charlotte Field Office, Wilmington District
Work cell 704 798-6471
From: Braquet, Stephanie <[e-mail]>
Sent: Thursday, March 14, 2024 3:17 PM
To: Brumagin, Stephen A (Steve) CIV USARMY CESAW (USA) <[e-mail]>; Conchilla, Ryan
<[e-mail]>
Cc: Jones, Scott A <[e-mail]>; Dale Swicegood <[e-mail]>; Euliss, Amy
<[e-mail]>
Subject: [Non-DoD Source] perched pipe R-5768 US 311 (South Main Street)
Steve and Ryan,
On R-5768-permit site 2 we have a perched pipe. (See attached pictures). It is a 42" pipe that should have been
buried 20% but it was laid at grade, which was an oversight. However, even if the pipe had been buried at the 20%
requirement, it would have perched. The pipe is currently 1' above the water, and the plunge pool is about 1' deep.
The area has scoured 2' since installation and the 20% burial would have been around 9". If the pipe had been
installed correctly, we would have at least 15" of scour. We can correct the perch using an energy dissipator or we
can drop the pipe with a junction box and pipe extension. If anything is recommended, we would like to combine

rip rap with native material, hoping to be able to proceed without a permit modification? I'm suggesting native
material because we are hoping to keep the impact from being deemed a `loss of water'. We will do whatever you
recommend. Although, after read ingthrough the Regional General Permit 50 Special Conditions, specifically (5) it
states:
Culverts/pipes placed across wetland fills purely for the purposes of equalizing surface water do not
have to be buried but must be of adequate size and/or number to ensure unrestricted transmission of water.
The pipe is solely for equalizing surface water because the flow is wetland4pipe4stream. Aquatic passage in the
pipe system should not be a concern either. And, as you can see from the attached pictures, there area lot of
sheer rock drop-offs, most of which are beyond our construction limits. We would like to consider this pipe purely
fort he purpose of equalizing surface water and hope you would agree.
For the Corps, the Action Id: SAW-2022-01426
For DWR, the project no is 20210453
If you have any questions, please feel free to reach out.
Thanks
Stephanie Braquet
Division 9 Environmental Specialist
North Carolina Department of Transportation
336 747 7800 office
scbraguet(cancdot.gov
375 Silas Creek Parkway
Winston Salem, NC 27127-7167
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