Re External Re Additional Information Requested_Recieved 20240412

Baker, Caroline D
From: Derek Goddard <[e-mail]>
Sent: Thursday, April 11, 2024 4:13 PM
To: Hanbury, Matthew S
Subject: Re: [External] Re: Additional Information Requested, Smoker Stream Bank Restoration
-20240450
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Hey sir,
I should have specified it I added a detail on the detail sheet. Did you see that?
We are essentially going to construct a temporary coffer dam with Boulders and geotextile fabric to dewater around the
actual excavation and then use a pump to supplement the dewatering. This will allow the stream to bypass our live
excavation and keep active a portion of the channel.
Does that make sense?
Thanks
On Thu, Apr 11, 2024, 3:54 PM Hanbury, Matthew S <[e-mail]> wrote:
Mr. Goddard,
Thank you for the additional information. I have uploaded the updated plans into the project file. However, to issue the
final approval I will still need flow diversion/pump around details that will ensure there will not be a water quality
violation while work is being preformed at this site. The drawing added to the plan is not sufficient in that it does not
depict details of how the noted pump around will be performed. You can do so in an updated drawing, or just provide a
narrative response to this email. For example, there will be a temp coffer dam installed directly up stream from
workflow, a pump around system will... Please be sure to include how the discharged water will be treated to avoid
turbidity discharge (e.g., pumped into filter bag).
Thank you for your attention to this matter,
Matthew Hanbury
1

Environmental Specialist, Division of Water Resources
North Carolina Department of Environmental Quality
Office: 828.296.4662 1 Cell: 828.989.7675
matthew.hanbury0deq.nc.gov
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From: Derek Goddard <[e-mail]>
Sent: Wednesday, April 10, 2024 1:00 PM
To: Hanbury, Matthew S <[e-mail]>
Cc: Boggs, Brandee C CIV USARMY CESAD (USA)<[e-mail]>
Subject: [External] Re: Additional Information Requested, Smoker Stream Bank Restoration - 20240450
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Thanks Matthew. We have added the requested information to the attachment and made the changes
requested. Please let me know if you have any questions. Thanks
Derek
On Tue, Apr 9, 2024, 2:34 PM Hanbury, Matthew S <[e-mail]> wrote:
Mr. Goddard,

In review of the above subject titled project application, there is —146 linear feet of stream bank restoration
proposed utilizing a rock toe and hardened bank stabilization. Please provide following additional information
for review by April 29th, 2024, for approval.
1.In the boulter slope stabilization depicted on sheet C900-1, the detail does not reference the existing
stream bottom regarding the placement of the rock toe and sloped granite boulders. Could you please
submit additional information depicting this and/or if the bottom of the stream will be disturbed. I
assume that the instillation of the initial rock toe will require excavation of the stream, if this is the case,
please provide a flow diversion plan that will ensure all excavated work will avoid working in the flowing
water.
Additionally, as per the WRC comments submitted, please use your best discretion to avoid utilizing the
following species in the revegetation/stabilization plan: Black Walnut, Boxelder, Cottonwood, Green Ash, River
Birch, Silver Maple, Sweet Gum, and Hemlock; we recommend not using these species. For the following reasons:
-Black Walnut - allelopathic, really minimizes what can grow around its root/crown zone
-Boxelder - generally a lower elevation and wetland associated species
-Cottonwood - not appropriate anywhere in WNC
-Green Ash - susceptible to emerald ash borer, just a bad idea to plant
-River Birch - generally not except in larger floodplains (e.g., French Broad R) - I normally ask them to prove that
it's on site or adjacent if they want to plant it
-Silver Maple - generally not native to WNC except in larger floodplains (e.g., French Broad, Mud Creek in
Henderson Co)
-Sweet Gum - generally not a mountain species
-Hemlock - susceptible to hemlock wooly adelgid, just a bad idea to plant now
Regards,

Matthew Hanbury
Environmental Specialist, Division of Water Resources
North Carolina Department of Environmental Quality
Office: 828.296.4662 1 Cell: 828.989.7675
[e-mail]
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