RE_ _External_ Forbes Road Extension (DWR# 20230480_ SAW-2021-00042)

Wanucha, Dave
From: McHenry, David G
Sent: Friday, June 2, 2023 11:58 AM
To: Wanucha, Dave; Megan Bollero; Stygar, KRYSTYNKA B CIV USARMY CESAW (USA)
Cc: Aliisa Harjuniemi
Subject: RE: [External] Forbes Road Extension (DWR# 20230480; SAW-2021-00042)
Megan,
Under DOT's hydraulic guidance (mostly used for box culverts), baffles would likely be omitted here as well for reason
Dave notes. An outlet sill that extends up to the burial height (—I foot) would also backwater most of the pipe, which
would facilitate any aquatic passage even with no or only partial bedload retention.
Thanks for the coordination about this.
Dave McHenry
NCWRC Western DOT Coordinator
828-476-1966
NORTH
CAROLINA
From: Wanucha, Dave <[e-mail]>
Sent: Friday, June 2, 2023 9:25 AM
To: Megan Bollero <megan@cws-inc. net>; Stygar, KRYSTYNKA B CIV USARMY CESAW (USA)
<[e-mail]>; McHenry, David G <[e-mail]>
Cc: Aliisa Harjuniemi <[e-mail]>
Subject: RE: [External] Forbes Road Extension (DWR# 20230480; SAW-2021-00042)
Hi Megan,
The plan depicts a channel slope of 0.70% along the length of the low flow culvert and inverts
will be buried. With your proposed changes (no baffles, sills only), I'm thinking that the culvert
should backfill on its own creating a somewhat natural, heterogenous channel substrate
overtime on its own without the help of baffles. That depends on submitted engineering
designs, plans and adequate construction and installation. Once the project is complete, your
culvert must transmit baseflow and facilitate aquatic passage.
Whether or not baffles would create culvert maintenance issues, I'm not sure and that would
be difficult to predict. I think there would be maintenance required at some point even
without baffles. Regardless, unless I'm missing something, and pending concerns from the
Corps and WRC, the revision would be acceptable in terms of 401 water quality
1

permitting. Keep in mind, the City is ultimately responsible for ensuring all permit conditions
are met.
Let me know if you have any questions.
Dave W.
Dave Wanucha
Environmental Specialist II
Transportation Permitting Branch for NCDOT Divisions 9 and 11
Division of Water Resources, Department of Environmental Quality
Office/Cell: [phone]
[e-mail]
kjle�
NORTH CAROLINA -
Department o1 Environmental Quality
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From: Megan Bollero <[e-mail]>
Sent: Thursday, June 1, 2023 2:21 PM
To: Stygar, KRYSTYNKA B CIV USARMY CESAW (USA)<[e-mail]>; Wanucha, Dave
<[e-mail]>; McHenry, David G <[e-mail]>
Cc: Aliisa Harjuniemi <[e-mail]>
Subject: [External] Forbes Road Extension (DWR# 20230480; SAW-2021-00042)
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Hello All,
I am reaching out about the Forbes Road Extension project in Gaston County. In our permit submission, the design was
to have a 60" culvert with baffles inside to accommodate for the variability in stream width here (I have attached the
detail for reference). We have already received the 401 and are awaiting the 404, but our client has reached out to us
and has said that The City of Gastonia is now wanting to remove the baffles, citing maintenance issues. They wanted me
to see if it would be satisfactory to remove the baffles throughout the culvert and just have a sill at the inlet and outlet.
Please let me know your thoughts.
Thanks,
Megan Bollero, PWS
Project Scientist

Carolina Wetland Services Inc.
550 E Westinghouse Boulevard
Charlotte, NC 28273
Cel I:(757)-576-6433
www.cws.net
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.
Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.