20160944 Ver 1_NCDOT NW14 Application for Bridge No 315 in Haywood County_20161104

Carpenter,Kristi
From:McHenry, David G
Sent:Friday, November 04, 2016 12:07 PM
To:Chambers, Marla J; Beckwith, Loretta A SAW; Chapman, Amy; Carpenter,Kristi; Barnett,
Kevin; Andrew Henderson ([e-mail])
Cc:Shumsky, Michael J; Shown, Marc T; Odell, Raymond; Bishop, Joseph M; Tanner,
Nathan R
Subject:RE: NCDOT Nationwide 14 Application for Bridge No. 315 in Haywood County
Follow Up Flag:Follow up
Flag Status:Completed
Marla,

Thanks for the questions. I was not at the scoping for this bridge, so I’ve copied some of our project engineers/designer
who may be more familiar with the constraints/issues out there (engineers please correct me if I am off-base with my
limited engineering knowledge!). But, I have been to the site at least a couple times now.

I believe avoiding the stream relocation would be problematic for several reasons. As you point out, we will have an on-
site detour west of the road, but that detour will not require grading into that steep hillside to the southwest of the
bridge. However, it will cut into that soil drive between the hillside and existing bridge, temporarily (see sheet 4 in
drawings). If we widen that way, instead of towards the creek, then we would have to do considerable work back into
that slope. Also, although that drive is soil and not often used, we nonetheless would be obligated to tie it back-in and it
is already real steep. I’m not sure the drive would be useable if we widened that way. There also may be a reason for
the proposed alignment related to roadway geometry as well (e.g. elimination of an extra slight curve on the south
bridge approach to make the road way into a one long curve direction), but that stuff is out of my expertise.

I’m not sure we can bury the culvert deeper here because it would cause more frequent overtopping. That is a Shown-
hydro question, but we will look into it. I’ve also heard, though not yet confirmed that, that it may be better to place
box culverts (at least RCBCs) with the invert at grade, instead of 1’ down, because of head-cutting or other occasional
problems, at least on relatively steep cobbly streams like this one (I don’t think I’ve seen this problem in Division 14 yet,
at least with box culverts, so if anyone knows more I’d be very interested). We will be backfilling the culvert and
benching the inlet/outlet. The notches will be 6’ wide and 6” deep and aligned on the inlet near the right side (aligned
with the channel curve thalweg) and exit the culvert in the middle. The middle sill notch will be down the middle as
well. Sorry, I should have included a structure plan sheet with the sill details.

I hope this helps and thanks again for the questions. Please let me know if you need clarification or have additional
questions and I’ll be glad to delve further.

Dave

From: Chambers, Marla J
Sent: Tuesday, November 01, 2016 1:23 PM
To: McHenry, David G; Beckwith, Loretta A SAW; Chapman, Amy; Carpenter,Kristi; Barnett, Kevin; Andrew Henderson
([e-mail])
Subject: RE: NCDOT Nationwide 14 Application for Bridge No. 315 in Haywood County

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I have a couple questions for this one, it appears that the road is being moved toward the parallel stream channel,
prompting the relocation of the main stream. Couldn’t the road be moved and widened in the other direction, which is
the direction of the onsite detour, an area that will be disturbed and avoid the relocation impact to this 6’ wide stream?

Also, using an aluminum culvert, are you following the recommendations for the former DWQ aluminum culvert study
(deeper burial, etc.)? Will you be back filling in a manner that will maintain the channel and bankfull benches through
the culvert? How wide are the notches and how will they be configured, all three through the middle of the culvert?

Thanks,
Marla

Marla Chambers // NCDOT Coordinator

Habitat Conservation Program

NC Wildlife Resources Commission
c/o NCDOT

206 Charter Street

Albemarle, North Carolina 28001
office: 704-982-9181
mobile: [phone]
[e-mail]

ncwildlife.org

From: McHenry, David G
Sent: Monday, October 03, 2016 9:32 AM
To: Beckwith, Loretta A SAW <[e-mail]>; Chapman, Amy <[e-mail]>;
Carpenter,Kristi <[e-mail]>; Barnett, Kevin <[e-mail]>; Andrew Henderson
([e-mail]) <[e-mail]>; Chambers, Marla J <[e-mail]>;
DeWit, Benjamin J <[e-mail]>
Cc: Tanner, Nathan R <[e-mail]>; Shumsky, Michael J <[e-mail]>
Subject: NCDOT Nationwide 14 Application for Bridge No. 315 in Haywood County

Folks,

Please find attached a Nationwide 14 Permit Application for a bridge to culvert project in Haywood County. Please
advise if you have any questions about the application or need additional information.

Thanks for your assistance with this request.

Dave McHenry
Environmental Officer

NC Department of Transportation/Division 14

828 586 2141 office

828 246 -7078 mobile
[e-mail]

253 Webster Road

Sylva, NC 28779

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