20160299 All Versions_RE R2536_ENV_SEC01 - Channel Stabilization_20161012 (3)

Wrenn, Brian L
From:Goodwin, Jeremy A
Sent:Wednesday, October 12, 2016 9:56 AM
To:Dilday, Jason L; Chapin, Hiram T; [e-mail]; Blakley, Reuben; Wrenn, Brian L
Cc:Staley, Mark K; Parish, Jennifer S; [e-mail]; Tina Swiezy ([e-mail]);
Mike Merritt ([e-mail]); [e-mail]; [e-mail]
Subject:RE: R2536_ENV_SEC01 - Channel Stabilization
Matt,

The determination as to when the channel is stabilized is ultimately up to the regulatory agencies. Generally, Field Ops
and/or the DEO will help coordinate and give a supporting opinion in the decision, but in this case it will be up to Brian
and Andy as when they can turn the stream into the new channel. I will add that different Divisions and regulatory
offices handle this differently with the decision on some smaller channel changes being handled by the Field Ops and/or
DEO personnel. However given the size, I would expect you would need to coordinate with DWR and the Corps for an
onsite visit or possibly submit photo documentation.

Thanks,

Jeremy Goodwin, PE, CPESC, CPSWQ
Soil & Water Engineering Supervisor

Roadside Environmental Unit

North Carolina Department of Transportation

919 707 2942 office

[e-mail]

1 South Wilmington Street

1557 Mail Service Center (MAIL)

Raleigh, NC 27699-1557

Email correspondence to and from this address is subject to the

North Carolina Public Records Law and may be disclosed to third parties.

From: Staley, Mark K
Sent: Wednesday, October 12, 2016 8:39 AM
To: Goodwin, Jeremy A; Parish, Jennifer S
Subject: FW: R2536_ENV_SEC01 - Channel Stabilization

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From: Dilday, Jason L
Sent: Wednesday, October 12, 2016 7:42 AM
To: Staley, Mark K <[e-mail]>
Subject: FW: R2536_ENV_SEC01 - Channel Stabilization

Mark,
Have you got any suggestions for how the contractor can resolve this issue?

Jason

From: Matthew Cook \[mailto:[e-mail]\]
Sent: Tuesday, October 11, 2016 3:52 PM
To: Dilday, Jason L <[e-mail]>
Cc: Michael Prince <[e-mail]>; Tina Swiezy <[e-mail]>; Mike Merritt <[e-mail]>; Jim
Eisenhardt <[e-mail]>; Jeff Meador <[e-mail]>; Blakley, Reuben <[e-mail]>
Subject: R2536_ENV_SEC01 - Channel Stabilization

Jason

We have a location on the Asheboro Bypass where we are having issues establishing a grass lined channel. It is -L- 66+00
– 71+00 RT. This is the outlet of RCBC 100. It is a large channel relocation with overbanks. Currently no water has been
released in to it so that the liner can be established.

The contractor finished construction of this channel over a month ago. This is shown in the attached pdf 026-
R2536_EC_psh08A.pdf, the first phase of the RCBC construction sequence. Our plan was to sod the bottom and low
flow banks so that it would stabilize quickly. This would then allow us to release water through it. DWR advised against
this because fescue sod is not considered a native seed. So, the contractor seeded the area. Prior to Hurricane
Matthew, they had seeded it three times in the last five weeks. They also had their seeding contractor on site yesterday
to see what additionally they could do. From the attached pictures, you can see that the seed in some locations has
taken root and is becoming established, especially at the pic taken closest to the proposed RCBC outlet. IMG_3.pdf was
taken near the outlet of the proposed RCBC facing upstream, IMG_2.pdf was taken half way down the channel facing
upstream, and IMG_1.pdf was taken where the channel ties in to the existing stream facing upstream. In order to move
to phase 2 (attached 027-R2536_EC_psh08B.pdf), the channel needs to be stabilized. The contractor has even been
using the water truck to try to water the area when it hasn’t rained. The pics attached were taken October 10 which is
about 24 hours after they had just received 4” of rain from Hurricane Matthew. The site is holding up well.

There is some grass established. The standing water near the stream tie in is due to the erosion control device there
keeping it from leaving the site. Also, this area is more shaded than the areas near the proposed RCBC outlet. If we are
allowed to release water through the channel, this would essentially remove almost 1200’ of meandering jurisdictional
stream through the site and place it in a stable plastic lined channel. The RCBC construction could then begin.

My question is how much grass is needed to be considered stable? The bottom of the channel currently is not erodible
material since it has been lined with coir fiber matting. Also, jurisdictional streams do not generally exhibit grass in the
flow line. While we realize the necessity to not allow sediment to leave the site, once water is released through this
channel the grass will probably die off due to the constant presence of water. I am asking this because we want to do
what is right, but we don’t want to wait another month to establish grass that is going to die when the water is
released. Are we primarily waiting for grass to become established on the overbanks?

Please feel free to forward this to Brian Wrenn and Andy Williams. We would like to have their input as well. We are
also having our monthly ride through next Tuesday, October 18 and would like them to come. Any guidance you can
provide would be welcomed. Thanks.

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___________________________________

Matthew L. Cook, P.E.

Project Manager

RK&K
900 Ridgefield Dr., Suite 350
Raleigh, NC 27609

919.878.9560 P | 919.653.7350 D
www.rkk.com

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