20130918 All Versions_U-2525B temporary crossing at N Buffalo Creek_20160915 (2)

Wrenn, Brian L
From:Wrenn, Brian L
Sent:Thursday, September 15, 2016 2:17 PM
To:Parker, Jerry A
Cc:[e-mail]
Subject:U-2525B temporary crossing at N. Buffalo Creek
Jerry,
After speaking with several people in my office regarding our field visit this morning, I am comfortable with DOT
removing the crossing in phases. I’ve summarized our discussions below:

Barrier wall wrapped in fabric or sheet piling will be used to build coffer dams on the upstream and downstream

side of the crossing for removal of approximately 3 of the temporary crossing pipes. Flow will be allowed to
continue through the remaining 5 pipes of the crossing.

A turbidity curtain will be installed downstream.


Water in the work area will be pumped out and into a settling basin or silt bag prior to discharging back to

stream.

The crossing material will be excavated within the cofferdam area down to the matting under the pipes, and the

far bank will be contoured and stabilized (rip rap above the ordinary high water mark is allowable).

Once stabilized the stream flow will gradually be turned back into the newly opened portion of the channel.


Then, the cofferdams will be moved to the opposite side of the stream, the area dewatered, and the remaining 5

pipes of the crossing removed similar to the first phase.

The banks will be contoured and stabilized and the stream will gradually be returned to the stream channel.

DWR and the Corps of Engineers shall be notified at least 48 hours prior to beginning the crossing removal. If during
removal, turbidity issues occur or sediment is lost to the stream, work must be ceased and DWR contacted.

I don’t have everyone’s email, so if you could forward this along to the folks in attendance this morning, I would
appreciate it. If you have any questions or additional comments on this, please do not hesitate to contact me.

Brian Wrenn
NCDWR – Transportation Permitting Branch
1617 MSC
Raleigh, NC 27699-1617
919-707-8792 (office)
919-710-6516 (mobile)
[e-mail]

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