20090017 Ver 1_More Info Received_20090212

[Fwd: Press Project in Watauga County]
Subject: [Fwd: Press Project in Watauga County]
From: Sue Homewood <[e-mail]>
Date: Thu, 12 Feb 2009 16:38:56 -0500
To: Laurie J Dennison <[e-mail]>
for file 09-0017
------- Original Message --------
Subject:Press Project in Watauga County
Date:Thu, 12 Feb 2009 21:35:51 +0000
From: dhmac a,beIIsouth.net
To: Sue. HOmewood(&ncmaiI met
CC:Moretz, Dennis <dennisRmoretzconstruction.com>
eq - 0011
Ms. Homewood, attached is a pdf of the road profile with the two pipes shown. Both pipes will be able to be buried
approximately 9 to 11 inches. Also attached is a sheet detailing the installation of the two pipes. Please call if you have any
questions.
Thanks, Donald
Sue Homewood
NC DENR Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
08312.doc Content-Type: application/msword
Content-Encoding: base64
08312-Model.pdf' Content-Type: application/pdf
Content-Encoding: base64
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Pipe Installation Details
for
Wayne M. D. Press Project
Watauga County, NC
Stream Crossing One: 48" CMP
There is a 48-inch CMP, 65 feet in length, to be placed to carry the stream under the proposed road fill
at station 12+65. This pipe will be placed along an area to the west of a bend in the stream and in
undisturbed soil. This is to be done with minimal impact to the stream itself. The stream will remain
undisturbed during the placement of the pipe.
Procedure: 1. Install silt fence along the top of the west bank of the stream beginning at the point of
the downstream intersection of the proposed pipe with the stream bed to a point approximately 20 feet
upstream of the upstream end of the pipe.
2. Remove undergrowth and brush from area, keeping existing stream bank undisturbed.
3. At downstream end of pipe, with sandbags, construct a cofferdam along the west side
of the streambed to prevent the stream from back flowing into pipe trench.
4. Begin digging trench for pipe at downstream end, placing removed material on the
west side of the pipe location. Dig trench only long enough for installation of first joint of pipe. Bottom
of pipe is to be 9 to 10 inches below existing, relative streambed and on the same slope as the steam.
5. Place first joint of pipe and cover, leaving the downstream end exposed. Continuing
digging trench and installing pipe sections until reaching the upstream end.
6. Construct 2nd cofferdam, with sandbags, along west side of streambed before
breaching the stream bank. Remove bank and install final section of pipe.
7. Remove both downstream and upstream coffer dams and divert flow into pipe. If
necessary place sand in stream channel to divert flow into pipe.
8. Silt fence along stream bank can now be removed and silt fence for the toe of the fill
slopes need to be installed. The two headwalls can now be constructed and once completed fill for the
roadbed placed.
Stream Crossing Two: 66" X 51" Arch Pipe
There is a 66" X 51" arch pipe, 30 feet in length, to be placed to carry the small creek along the west
side of the state road under the proposed road at station 0+31.50. This pipe will have headwall at both
upstream and downstream ends and installed with it bottom approximately 10 to 11 inches below the
natural creek bed. In order to install this pipe the stream will have to be temporally.
Procedure: 1. Construct temporary cofferdam, using sandbags, approximately 10 to 12 feet
upstream of pipe end location. Install pumps and pipe to carry water around area of installation,
discharging flow back into the creek channel. The pipe from the pump is to be placed along the east
side of the creek between the creek and state road. Construct a temporary channel in the east bank of
the creek and line with rip-rap stone for the pump to discharge into and reduce the force of the flow
before the water re-enters the creek channel. This temporary channel is to be filled in once the arch
pipe is installed and the creek returned to its normal flow.
2. Once the creek bed has been exposed, remove the stone and gravel down
approximately 10 to 11 inches below natural elevation.
3. Place the arch pipe into position and using the stone and gravel removed from the
creek bed, line the floor of the arch pipe to return the elevation of the original creek bed.
4. Using sandbags, construct new cofferdams at upstream edges of the arch pipe
approximately 5-6 feet upstream, keeping the center of the channel open. Once this has been
completed, the original cofferdam in the creek is to be removed, releasing some of the flow into the
pipe. Remove pumps and return flow to original creek channel. Maintain the two cofferdams at
upstream edge of pipe until headwall is constructed.
5. As the construction of the two headwalls progress, fill can be placed over the arch
pipe to final grade.