20150770 Ver 1_DOTs response to WRCs questions_20150901

Carpenter,Kristi
From:Slaughter, Johnathan H
Sent:Tuesday, September 01, 2015 10:17 AM
To:Chambers, Marla J; Kichefski, Steven L SAW
Cc:Wanucha, Dave
Subject:RE: Bridge 116 over Mill Creek on SR 1110 (Zion Methodist Church Rd.), Ashe Co.
Marla,

The streambank was already hardened by the existing bridge abutments so we only counted the new additional impact.

The riprap benches inside the culvert were designed by the consultant to match the existing variable width of the
stream. They are basically proposing to install stone up to the existing edge of water line, which varies in width.

From: Chambers, Marla J
Sent: Monday, August 31, 2015 4:29 PM
To: Kichefski, Steven L SAW <[e-mail]>
Cc: Wanucha, Dave <[e-mail]>; Slaughter, Johnathan H <[e-mail]>
Subject: Bridge 116 over Mill Creek on SR 1110 (Zion Methodist Church Rd.), Ashe Co.

I have attached regular comments, however I have a couple questions. The amount of permanent impacts, 62’of riprap
stabilization, doesn’t make sense to me. The culvert, 63’ long, has the riprap floodplain-type of bench to maintain
channel width through the culvert (on one side) and extends a few feet upstream and downstream of the culvert. It
seems like the impacts would be higher.

The other aspect I question is the design of the riprap benches in the culvert. The bench on one side does not continue
all the way through, and the resulting channel that’s proposed has a variable width. I’m curious why it was designed
that way.

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

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