20060202 Ver 4_More Info Requested_20150319

Johnson, Alan
To:lapsleyjs@cdmsmithcom
Subject:Briar Creek Sewer
I am reviewing the 401 application for the project.

You show no impacts for the culvert. Is this a new culvert? If so, I would think this would be under a NW 3. How much
additional (new impact) is due to the culvert and the rip rap apron. What is the base flow stream width. We may need
more details for the culvert.

Are their temporary stream crossings (for vehicles?)? If so, those should be included on the application

It appears the sewer line to cross the stream is done open cut. How is this work proposed to be done “in the dry”? Do
you plan to pump around? Are coffer dams proposed?

Apparently for ALL the stream (sewer line) crossing, the only permanent impact is the stabilization of the bank? The
proposed stabilization range from 25 ft to 50 ft. This appears excessive for an open cut. I would assume the stabilization
(and bank clearing) would be based on the cut to the stream bank to install the sewer line?

The stabilization calls for geo tech fabric at the bank toe. If the coir matting is properly staked and the slope properly
“packed”. I am not sure the geo tech fabric is needed. Worst case the bank may give and the fabric is left to move down
stream. Rip rap toe maybe to more appropriate if there is concern.

Finally, to clarify, no rip rap is proposed to go in the stream, except as an apron for the replacement culvert.

Thanks
Alan Johnson

Alan D Johnson – Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]

E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
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