HomeMy WebLinkAbout20170150 Ver 1_WRC Comments_20170407Carpenter,Kristi
From: Lauffer, Matthew S
Sent: Friday, April 07, 2017 5:51 PM
To: Wanucha, Dave
Cc: Lauffer, Matthew S
Subject: FW: Wilkes 317 Request
Dave,
Hope you are well. Thanks for the advice. I believe we have a green light.
Regards,
Matt
Matthew (Matt) Lauffer, PE, CPM
Assistant State Hydraulics Engineer
Hydraulics Unit
Department of Transportation
919 707 6703 office
919 621 0443 mobile
mslauffer(cilncdot.gov
1590 Mail Service Center
Raleigh, NC 27699-1590
1020 Birch Ridge Dr.
Raleigh, NC 27610
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
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From: Chambers, Marla J
Sent: Friday, April 07, 2017 11:42 AM
To: Lauffer, Matthew 5 <mslauffer@ncdot.gov>
Subject: RE: Wilkes 317 Request
1
I have reviewed your request and, while I can't agree with many of your points, I will not
object to going forward with the project as planned. I was able to find my hand-written
notes from the field meeting that I did attend on 5/5/2014. I found that splitting the
base flow was planned at that time, and even though I tried to get that changed during
the meeting, they assured me that there was no choice in this particular situation. Their
reasoning was very different from yours, which still leaves me wondering, but I will
withdraw my objection for this project. I hope this is truly a rare practice and proper
stream crossing structures and features, like that we recommend in our scoping letters,
are being used by NCDOT and their consultants across the state, including those projects
we never see the permit application for.
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: 704-984-1070
Marla.chambers(a�ncwildlife.orq
ncwildlife.orq
[�� f��1Y�►�
From: Lauffer, Matthew S
Sent: Monday, April 03, 2017 12:14 PM
To: Chambers, Marla J <marla.chambers@ncwildlife.or�>
Cc: Lauffer, Matthew S <mslauffer@ncdot.�ov>
Subject: Wilkes 317 Request
Hi Marla,
Thanks for your time the other week on Wilkes 317. The current discussion is that a
2@15X 6 would be more preferable than the proposed and completed design of the
3@10'X6". I would like to request that this project move forward as designed with the
3@10'X6' for the following reasons:
The meeting minutes indicate that you were made aware of the proposed
structure back in May of 2014. While you may not have been at the FSM ( It
appears you were not based on the attendees list format), it is apparent that
you were copied. Bringing forward a concern about the configuration this late in
the project delivery process is difficult and requires redesign and delay in the
project. The culvert configuration was clearly identified in the notes.
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The 3@10'X6' RCBC structure meets the existing stream channel configuration
better than the 2@15 feet and will cause less impact to flow disturbance than
the 2@15Feet. Measurements upstream and downstream of the crossing
indicate widths that average 19 feet under bridge, 20 feet upstream, and 16 feet
downstream. If these dimensions are averaged, it comes out to 18 feet. The
2@10X 6 foot culverts (not including high flow barrel) that will carry the
majority of the flow for the base flow and bankfull events have a more
consistent cross-sectional area than the 1@15X6 culvert (not including high flow
barrel). The 2@10X6 are closer to the existing available cross-sectional area
than the 1@15X6. While there is an 8" web that splits the flows, more efficient
conveyance area is maintained.
In your email on February 3, 2017 (attached) you noted "redesign is needed for
this project in order to minimize impacts; to maintain the natural dimension,
pattern and profile of the waterway through the crossing; and to avoid the
negative impacts that can occur from splitting the base flow of the river." While
the stream is in a Trout County, the West Prong Roaring River is a Class C stream
and not 303d and not designated as trout (WRC or DWR). There are also other
more adverse impacts in the watershed as identified in the photo below
(poultry farming and logging operations) that will impact the natural dimension,
pattern and profile of the waterway more than the crossing.
4
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In addition, in your February 3, 2017 email, you state, "1'm not sure why the
news that this practice is inappropriate has not gotten out to all those that
design waterway crossings, but we need to try to correct that." Based on Yancey
16, SF-700353, and Wilkes 153 ( A few recent projects) NCDOT is not trending
towards splitting base flow but just the opposite. Yancey 16 was a specific case
where the proposed 2@8 X3 was redesigned to a bridge. The other projects
were a 2@13X8 RCBC and 20' X 1' bottomless culvert respectively. Many other
projects over the last several years were designed not to split the base flow or
put in the appropriate sills and baffles to maintain low flow depth.
5. The potential for debris blockage for the 3@10'X6' is not anymore a concern
than the 2@15'X6'. While a 15' opening is larger, the watershed has not been
prone to blockage and it is not anticipated that this will be a concern.
I greatly appreciate your consideration of this request. I am available for further
discussion.
Respectfully,
M att
Matthew (Matt) Lauffer, PE, CPM
Assistant State Hydraulics Engineer
Hydraulics Unit
Department of Transportation
919 707 6703 office
919 621 0443 mobile
mslauffer(a)_ncdot.qov
1590 Mail Service Center
Raleigh, NC 27699-1590
1020 Birch Ridge Dr.
Raleigh, NC 27610
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Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Facebook Twitter YouTube
Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third
parties.
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