20211593 Ver 1_Correspondence_20211207

Strickland, Bev
From: Sullivan, William <[e-mail]>
Sent: Tuesday, December 7, 2021 8:56 AM
To: Norton, April R CIV USARMY CESAW (USA)
Cc: Cohn, Colleen M
Subject: [External] RE: Culvert Profile (SAW-2021-00064) NC-55 and Hopson Road
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Thanks April, we will revise the plans to include a sill detail and send back over shortly!
Willie Sullivan, PWS
Kimley-Horn 1421 Fayetteville Street, Suite 600, Raleigh, NC 27601
Direct: 919 677 2113 I Mobile: [phone] I www.kimley-horn.com
From: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
Sent: Monday, December 6, 2021 1:43 PM
To: Sullivan, William <[e-mail]>
Cc: Cohn, Colleen M <[e-mail]>
Subject: RE: Culvert Profile (SAW-2021-00064) NC-55 and Hopson Road
Willie — thank you for your thorough response. Please see my response below in red and let me know if you have any
questions or concerns.
We could propose a sill at the culvert inlet to hold water in the upstream portion of the wetland if that would be
preferred with no change to the impact quantities or we can design the culvert depth to be closer to the surface if
necessary, though we may lose some stability and depth of native material to be placed inside. The Corps often
recommends that culverts are placed at -grade when installing in wetlands. However, in this case, it seems it would be
best to propose a sill at the inlet to help maintain hydrology and not lose other wetland indicators.
April
April R. Norton
Regulatory Division
US Army Corps of Engineers
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Phone: [phone]
Fax: [phone]
Email: [e-mail]
From: Sullivan, William <[e-mail]>
Sent: Monday, December 6, 2021 12:34 PM
To: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
1

Cc: Cohn, Colleen M <[e-mail]>
Subject: [Non-DoD Source] RE: Culvert Profile (SAW-2021-00064) NC-55 and Hopson Road
April,
The culvert is proposed below grade to provide long term stability, prevent undercutting, and to allow for native/natural
material to be placed within the culvert after installation. Since wetland W11 is somewhat linear and has a decent slope,
we wanted to make sure the culvert is not compromised during high flow events. Additionally, the culvert has been sized
to carry high water and flood conditions downstream. We could propose a sill at the culvert inlet to hold water in the
upstream portion of the wetland if that would be preferred with no change to the impact quantities or we can design
the culvert depth to be closer to the surface if necessary, though we may lose some stability and depth of native
material to be placed inside. Let me know if either of these options is preferred and we can revise plan sheets to send
back to you.
The rip rap impacts have been accounted for in the 0.34 acre of permanent roadway impacts in Section D, see
screengrab below for clarity. I can pull the impact out as a separate line from the roadway impact, but figured since it
was all fill resulting from the roadway, it would be easiest to calculate together. Feel free to give me a call if you would
like to discuss any of the above info!
Thanks,
Willie
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Willie Sullivan, PWS
Kimley-Horn 1421 Fayetteville Street, Suite 600, Raleigh, NC 27601
Direct: 919 677 2113 I Mobile: [phone] I www.kimley-horn.com
From: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
Sent: Monday, December 6, 2021 9:00 AM
To: Sullivan, William <[e-mail]>
Cc: Cohn, Colleen M <[e-mail]>
Subject: RE: Culvert Profile (SAW-2021-00064) NC-55 and Hopson Road
Hi Willie,
Thank you for the additional information.
Installation of culverts in wetlands shall ensure continuity of water movement and be designed to accommodate high
water or flood conditions. The culvert profile provided illustrates the culvert being installed below grade level, along
with Class I Rip Rap being placed below grade level for outlet protection. Could you please confirm that it is
environmentally necessary for the culvert to be placed below grade? Also, please confirm that the impacts for the rip
rap are accounted for under Section D. of the PCN?
Let me know if you have any questions.
Thanks,
April
April R. Norton
Regulatory Division
US Army Corps of Engineers
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Phone: [phone]
Fax: [phone]
Email: [e-mail]
From: Sullivan, William <[e-mail]>
Sent: Wednesday, December 1, 2021 2:45 PM
To: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
Cc: Cohn, Colleen M <[e-mail]>
Subject: [Non-DoD Source] RE: Culvert Profile (SAW-2021-00064) NC-55 and Hopson Road
April and Colleen,
Attached is the profile view of the proposed culvert crossing on the NC-55 and Hopson Road. Please let me know if you
need anything additional on this one!
Best,
3

Willie Sullivan, PWS
Kimley-Horn 1421 Fayetteville Street, Suite 600, Raleigh, NC 27601
Direct: 919 677 2113 I Mobile: [phone] I www.kimley-horn.com
From: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
Sent: Wednesday, November 24, 2021 11:43 AM
To: Sullivan, William <[e-mail]>
Cc: Cohn, Colleen M <[e-mail]>
Subject: Culvert Profile (SAW-2021-00064) NC-55 and Hopson Road
Hi Willie,
I'm reviewing your PCN for NC-55 and Hopson Road (SAW-2021-00064).
Could you please provide the profile view of the double barrel culvert crossing? Please ensure that the profile view also
includes any proposed rip rap.
Let me know if you have any questions.
Thanks,
April
April R. Norton
Regulatory Division
US Army Corps of Engineers
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Phone: [phone]
Fax: [phone]
Email: [e-mail]
4