20150079 Ver 1_Email on constructed riffle rock size_20150511

Wainwright,
From: Wainwright, David
Sent: Monday, May ll' ZUl58:57AK4
To: Thompson, Larry B; Johnson, Alan; Amsch|er, Crystal [ SAW
Cc: Howard, Joel K4; Haywood' Luther G; Miller, Vickie M; Wainwright, Dominic; Baker,
Virginia (virginia.baker@ncdencgov
Subject: RE: Windy Road Mitigation
Larry,
The DVVK has considered the provided information. Based on the reasoning for wanting to use class ||,the fact that it will
be buried, and that the slopes will be rather steep the DWR is alright with what is being proposed. Thank you for the
justification information.
David Wainwright
NCDENR'Division of Water Resources
1617 Mail Service Center,Raleigh,North Carolina 27699'1617
Phone: [phone] Fax: [phone]
Email correspondence to and from this address/ssubject to the North Carolina Public Records Law and may uedisclosed
to third parties unless the content/s exempt uv statute o,other regulation.
AP�m meconsider the en vi environment printing thi mema i|
David Wainwright
From: Thompson, Larry B
Sent: Wednesday, May O6, 2O157:46AM
To: Wainwright, David; ]ohnson, Alan; Amsch|er, Crystal C SAW
Cm: Howard, ]ne| M; Haywood, Luther G; Miller, Vickie M; Wainwright, Dominic
Subject: Rw: Windy Road Mitigation
Hi folks,
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?
Thankyou!
La rry

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From:Wainwright, Dominic<Dominic.Wainwright @hdrinc.com>
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. 1 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,
[)oiir6iinliic 1W Wdiinwiil#ht, ps i:::
ID 919.232.0 648 IM 919.696.1543
hdrinc.corn/fotillow-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.
James R Rice, IIPII1
hfydrauhcs Engineer/Assoc late
IH ID R
3133 Natiionall 1:::7r, Smite 207
:Rall6gh, NC 27612-4845
919.232.6621 F 919.785.1181
Dames.rice(cD_hdrinc.com
hdriinc.corm/follllow-us
From: Wainwright, Dominic
Sent: Tuesday, May 05, 2015 9:52 AM
To: Rice, James R.
Subject: FW: Windy Road Mitigation
2

From: Thompson, Larry B [mai Ito:lthompsonCa)ncdot.gov]
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, Dominic:
Sharing this for your information. NCDWR has raised concerns regarding the proposed design for the Windy Road
stream relocation...
Larry
Larry Thompson,PWS,LSS
Environmental Supervisor
NCDOT e 10th 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.
Iwo
wwwwwwww
a
ro
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
3

To:Amschler, Crystal C SAW(Crystal.C.Amschler @usace.army.mil); '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!
Larry
Larry Thompson,PWS,LSS
Environmental Supervisor
NCDOT- 10th Highway Division
704-301-4881 cell
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