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

Carpenter, Kristi
From: Braquet, Stephanie
Sent: Thursday, March 14, 2024 3:17 PM
To: Brumagin, Stephen A (Steve) CIV USARMY CESAW (USA); Conchilla, Ryan
Cc: Jones, Scott A; Dale Swicegood; Euliss, Amy
Subject: perched pipe R-5768 US 311 (South Main Street)
Attachments: R-5768 outletjpg; R-5768.4jpg; R-5768.5jpg; R-5768.6jpg
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 whateveryou
recommend. Although, after reading through 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 are a lot of
sheer rock drop-offs, most of which are beyond our construction limits. We would like to consider this pipe purely
for the 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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