20150079 Ver 1_email on stream relocation design_20150506

Baker, Virginia
From: Wainwright, David
Sent: Wednesday, May 06, 2015 10:29 AM
To: Baker, Virginia
Subject: FW: Windy Road Mitigation
Attachments: 17BP.10.R.53 Right-of-Way Plans 2014-10-08 Rev 2015-04-29.pdf
GinnY,
Here is a response from aOT's engineering firm regarding the size of rock for the Windy Road Bridge replacement
stream relocation constructed riffles.
�. .
From: Thompson, Larry B
Sent: Wednesday, May 06, 2015 7:46 AM
To: Wainwright, David; Johnson, Alan; Amschler, Crystal C SAW
Cc: Howard, Joel M; Haywood, Luther G; Miller, Vickie M; Wainwright, Dominic
Subject: Fw: Windy Road Mitigation
Hifolks,
There has been a question regarding the choice of rip rap size for the constructed riffles in the proposed
stream relocation plan for Windy Road.
HDR has offered some comments in this email thread.
Would it be acceptable to discuss our options via email before making any revisions to the proposed plans?
Thank you!
La rry
From: Wainwright, Dominic <Dominic.Wainwri�[e-mail]>
Sent: Tuesday, May 5, 2015 11:46 AM
To: Thompson, Larry B
Cc: Howard, Joel M; Haywood, Luther G; Miller, Vickie M; Rice, James R.
Subject: FW: Windy Road Mitigation
Larry,
Please see my hydraulics engineer James Rice's email below which addresses NCDWR's concerns. I have attached the
Roadway Plans which do show the longitudinal stream profile on the grid on sheet 4. I believe our stream profile looks
quite similar to the sketch in Alan's email below. Sheet 2 of the plans shows the details of the rock step downs. Let me
know how you'd like to proceed or if you want me to pass this information on to Alan Johnson.
Thanks,

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hdrinc.com/follow-us
From: Rice, James R.
Sent: Tuesday, May 05, 2015 10:30 AM
To: Wainwright, Dominic
Subject: RE: Windy Road Mitigation
Dominic, the existing slope upstream of the project for this stream is approximately 1.5%. The existing slope of the
stream that runs along the existing roadway is closer to 2.5 or 3%. Somewhere along the way, the stream was
straightened and steepened to accommodate the construction of the road. This is why we have the severe head cutting
propagating upstream along the roadway. We discussed several options in the field and decided that the best way to
minimize potential for headcutting in the future would be to embed rip rap to produce a stepped effect in the stream. We
chose the larger rip rap to help provide better protection, and ultimately it wouldn't make much difference to how it looks
since the rip rap would be embedded. Smaller rock can be utilized, but may not be effective especially in the sections of
10% grade we are using to step down. The step downs are comprised of a 10% grade drop over a 15 ft distance (1.5 ft
step down). We needed a total of 3 of these to get to a longitudinal profile for the stream that we felt comfortable
with. To address Alan's concern of showing the profile, it is located on the roadway set of plans, which was not included
in the permit package per the permit guidelines. We can include the profile sheet in the permits if needed. We feel that
given the unnaturally steep slope of the existing stream, the design we have provided gives the best chance of a stable
system that reduces construction cost as well as long term maintenance cost.
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h`ydr�ulres Engrneer/Assocr�te
3733 Naiional Qr, 5uiie 207
Raleigh, NC 27612-4845
D 919.232.6621 F 919.785.1187
lames. rice(c�hdrinc.com
hdrinc.com/follow-us
From: Wainwright, Dominic
Sent: Tuesday, May 05, 2015 9:52 AM
To: Rice, James R.
Subject: FW: Windy Road Mitigation
From: Thompson, Larry B [mailto:IthompsonCa�ncdot.QOV]
Sent: Tuesday, May 05, 2015 9:30 AM
To: Miller, Vickie M; Wainwright, Dominic
Cc: Haywood, Luther G; Howard, Joel M
Subject: FW: Windy Road Mitigation
Vickie, aominic:
Sharing this for your information. NCaWR has raised concerns regarding the proposed design for the Windy Road
stream relocation...
La r ry
Larry Tholnpson, Pt�S, LSS
Environlnental Supervisor

NCDOT - lOth Highway Division
704-301-4881 cell
From: Johnson, Alan
Sent: Wednesday, April 29, 2015 9:38 AM
To: Thompson, Larry B
Subject: RE: Windy Road Mitigation
For that stream, I think the class II is overkill. It is a small stream upgradient. Wouldn't well embedded class 1 work? It
might be good to provide a longtitudinal profile.
It might be good to show the profile. I was thinking like a 6 ft riprap section and a quick drop (semi stepped down). 1 ft
drop, with a 6 ft riffle would
From: Thompson, Larry B
Sent: Wednesday, April 29, 2015 8:25 AM
To: Johnson, Alan
Subject: Fw: Windy Road Mitigation
How about this one? has the permit drawings in it.
La rry
From: Thompson, Larry B
Sent: Wednesday, October 22, 2014 9:47 AM
To: Amschler, Crystal C SAW ([e-mail]); 'Johnson, Alan'
Cc: Howard, Joel M; Haywood, Luther G
Subject: Windy Road Mitigation
Cyrstal,
Attached you will find a stormwater management plan and permit drawings for the Windy Hill Road bridge replacement
that we met on some time ago. The current plan is to go with an IP to replace the bridge with a culvert and relocate the
stream that runs along the roadway.
Would you mind taking a look at the impact sheet and letting me know what you would require mitigation for? I would
like to take that number and pursue the In-Lieu Fee mitigation prior to submitting the complete package to you.
Thank you!

La r ry
Lany Thompson, PWS, LSS
Environmental Supervisor
NCDOT - lOth Highway Division
704-301-4881 cell
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