20070489 Ver 1_Information Letter_20080408

Re: Construction issue on B-3916 in Wake County /
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Subject: Re: Construction issue on B-3916 in Wake County ~ 176 K
From: Rob Ridings <[e-mail]>
Date: Tue, 08 Apr 2008 15:38:24 -0400
To: Chris Murray <[e-mail]>
CC: "Alsmeyer, Eric C SAW" <[e-mail]>
Chris,
I agree with your assessment. I don't think we need a mod for this.
Thanks , ------
Rob
Chris Murray wrote:
Reference: Bridge No. 63 over Middle Creek on US 401 in Wake
County.
USACE Action ID No.: 200220001
NCDENR-DWQ WQC No.: 20070489
Eric and Rob,
The Department is currently constructing this bridge project in
Wake County. One issue has come up concerning stability around
bridge columns that are being constructed adjacent to the north
bank. An evaluation of the construction site and permit drawings
reveals that the middle column and the eastern-most column in
this area are being constructed right on the stream bank. As you
are aware, the drilled shaft columns are constructed within an
outer can that is eventually removed. This results in the
formation of an open space between the column and the streambank.
The streambank will be susceptible to both short- and long-term
erosion and instability during flood events. Water will get in
the open space and cause significant scour. The Department is
proposing to stabilize the area on the streambank and directly
around the two columns with up to 60 linear feet of Class B or
Class II rip rap. -
This proposed activity does not appear to trigger a permit
modification as: 1. The action of placing rip rap in this area
would likely be covered under NWP 13 which does not require
notification (as impacts are <500 linear feet) and 2. An
evaluation of the impact superimposed on the buffer permit
drawing would indicate that this activity is located within the
permitted buffer footprint. --- "
The attached drawing depicts the location of the proposed rip
rap. The Department is requesting that you review the
information presented in this email and determine if you concur
with my assessment of the situation. If you need additional
information,
please contact me at your convenience.
Chris Murray
1 of 1 4/8/2008 3:38 PM

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