20201051 Ver 1_More Info Requested_20200928

Strickland, Bev
From: Johnson, Alan
Sent: Monday, September 28, 2020 9:50 AM
To: Stout, Patrick (William)
Subject: Re: [External] 853W Transmission Main - Bank Stabilization
can you provide the new impacts. Corrected/updated copy of the stream impact table?
Thanks
From: Stout, Patrick (William) <[e-mail]>
Sent: Friday, September 25, 2020 10:37 PM
To: Johnson, Alan <[e-mail]>
Cc: 'John Shutak ([e-mail])' <[e-mail]>; Fred Braun
<[e-mail]>; Michael Caldwell <[e-mail]>; Tafilaku, Melissa L.
<[e-mail]>; Phil May <[e-mail]>; Pohle, Kyle <[e-mail]>
Subject: [External] 853W Transmission Main - Bank Stabilization
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Alan,
Thanks for taking the time to discuss the referenced project (DWR#20-1051). Per our discussion there are few items to
note as listed below:
• The previously submitted plans show and open -cut installation across Bearskin Creek (sheet C-3), but due to
comments from the NC Wildlife Resource Commission regarding mussels downstream and the need for a mussel
survey we are planning on installing the proposed transmission main using trenchless methods (Jack and Bore).
• The remaining 8 creek/ditch crossings will be performed by open -cut methods.
• We evaluated the crossings and are using more soft stabilization methods as requested.
• 4 of the 8 crossings will be stabilized by a temporary biodegradable rolled erosion control matting, such as North
American Green SC150BN or approved equal (see attached product sheet as we discussed). The matting will be
subsequently seeded with an appropriate wetland seed mix or live staked.
• The remaining 4 crossings will require riprap on banks for a 1/3 the height to top of bank and a similar
temporary biodegradable rolled erosion control blanket as mentioned above. The matting and top of bank will
be subsequently live staked with an appropriate vegetation such as a silky dogwood.
I have attached a typical detail for installation of the matting and a detail showing a typical bank stabilization with riprap
and live staking. As mentioned on the phone we will limit disturbance and impacts to the stream banks as much as
possible.
We will include these revisions as part of our resubmittal to the Army Corps once we receive all their comments.
Thanks,
Patrick
Patrick Stout, P.E.* I Engineering Manager, Water

Black & Veatch 1 175 Regency Woods Place, Suite 200, Cary, NC 27518
[phone] p 1 [phone] m I [e-mail]
*Licensed in NC
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