20090242 Ver 2_Email_20101014

Ridings, Rob
From: Ridings, Rob
Sent: Thursday, October 14, 2010 1:45 PM
To: Murray, Christopher A
Cc: Alsmeyer, Eric C SAW, Moore, David B; Luther, Mark W
Subject: RE: Construction issue at widening of 1-40 in Wake County (1-4744)
Chris,
As far as I am concerned, I am fine with what you propose. Since the amount of permanent
impact has not changed, I do not see the need for a permit modification. I will add this
email to our file for record purposes and consider your new approach as compliant with our
approval. I am glad DOT is working to get this site stable and with minimal impact to water
quality.
Thank you,
Rob
-----Original Message-----
From: Murray, Christopher A
Sent: Wednesday, October.13, 2010 6:25 PM
To: Ridings, Rob

Cc: Alsmeyer, Eric C SAW; Moore, David B; Luther, Mark W c .- rr+'
Subject: Construction issue at widening of I-40 in Wake County (I-4744),..
Reference:

Maintenance activities associated with widening of I-40 from east of SR; 1652;(Harrison..;?:-::•: es x?- _,
Avenue o east of SR 1319 (]ones Franklin Road) in Wake County. TIP No.:.I-4744,.:DWQ Project- -`
No. 20090242, USACE Action ID No. 2007-02812
Rob,
The contractor continues to progress on this project. We have had several pre-construction
meetings concerning construction activities at Permit Site No. 1. Construction at. this-, site
involves the repair of an existing 48 inch pipe structure. Three pipe segments have
separated from the outlet of the structure and are now located in a very,:large blow hole in _`-.. ,
the stream. Photographs of the existing site are attached to this email. The anticipated:,''
(and permitted) impacts at this site included 16 linear feet of permanent:stream impact
associated with installation of new pipe segments and 37 linear feet of permanent streambank
impact by the addition of rip rap on the streambank at the outlet of the:pipe structure.
This results in a total of 53 linear feet of permitted permanent stream impact at the site..
The current permit drawing is attached to this email.
We had the opportunity to thoroughly review the area and the Department is now proposing to
change construction in the area. The proposed revision will provide increased benefit the
environment. The proposed revised action is depicted in the attached revised permit drawing
and is described below:
1. Dewater stream using sandbags and pumps.
2. Remove an undetermined amount of intact pipe section. Note that this
determined until the contractor excavates the fill area above the damaged
locates stable, uncompromised pipe segments.
3. Install a junction box at limit of intact, stable pipe section.
4. Install up to 56 liner feet of new pipe segments that originate from
a) Invert of last pipe segment will attempt to be buried at least
streambed. However, this may not be practical due to presence of observed
cannot be
pipe sections and
the junction box.
one foot below
surficial bedrock.
1
Pipe invert will be set on the streambed (and not buried) if surficial bedrock is located at
proposed pipe extension.
b) Part of the larger blow hole in the area will be covered with the pipe extension
and fill material. In the event that a portion of blow hole still exists in the direct flow
line beyond the eventual pipe outlet, the Department may install rip rap in the blow hole
that will not extend above the downstream natural streambed grade. Filter fabric will not be
placed under any rip rap placed in the blow hole.
c) Part of the blow hole (lower left hand corner in the attached revised permit
drawing) will be covered with fill material and capped with Class II rip rap (underlain with
filter fabric). This will prevent eddying and scour in the area which would quickly
undermine the narrow portion of streambank in that area.
5. Class II rip rap will be installed as necessary on the streambanks. The extent of rip
rap will not exceed the amount depicted in the revised permit drawing.
We feel that this revised action provides for a better situation at this permit site. This
revised action still keeps the permitted permanent stream impact at 53 linear feet and does
not change any impacts to the riparian buffer. However, it now will affect the breakdown in
the type of permitted permanent stream impact: 40 linear feet of permanent stream impact
associated with installation of new pipe segments and 13 linear feet of permanent streambank
impact by the addition of rip rap on the streambank at the outlet of the pipe structure.
Please review this information and advise if this proposed change can be approved by your
agency.
Thanks,
Chris Murray
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