20080595 Ver 1_More Info Received_20080410

[Fwd: B-4540]
Subject: [Fwd: B-4540]
From: Chad Coggins <[e-mail]>
Date: Thu, 10 Apr 2008 07:16:23 -0400
To: Rob Ridings <[e-mail]>
Rob,
~~ ~ U ~` ~
..
These are the revised drawings including stormwater measures if
you need me to print these and send by mail I will. let me know.
I got Hydro to check behind the consultants on this and they
agree that a dissipater pad should be more than sufficient. Due
to Q10 discharge of .2 cfs and outlet velocity of .3 fps.
Chad Coggins
NCDOT Div. 4
Environmental Officer
252-296-3532
252-717-8699 (cell)
Subject: RE: B-4540
From: "Rice, James R." <[e-mail]>
Date: Wed, 9 Apr 2008 11:16:49 -0500
To: "Chad Coggins" <[e-mail]>
CC: "Jimmy Marler" <[e-mail]>, "Wainwright, Dominic"
<[e-mail]>, "Henderson, Jonathan" <[e-mail]>
Chad, here is the revised impact sheet. What I have proposed, based on
my conversation with Jimmy, is an 8X8 rip rap pad at the limits of the
existing ROW. After we put in a box, it looks like it will be a little
difficult to simply outlet onto the existing fill, so what we might have
to do is excavate a little of the existing fill. I sketched up kind of
what I was thinking. I think DWQ will like the fact that the dissipater
would be flatter and not on the existing fill slope. It may or may not
require a headwall, but that can be determined with further
investigation. Whatever we do shouldn't be a problem since we are
behind guardrail. We also need to emphasize that there is not much
water at all coming off the bridge. The total Q10 discharge at the
inlets is only 0.2 cfs and the 10-yr outlet velocity is 0.3 fps. Let me
know what you think.
James R. Rice, PE
HDR Engineering, Inc. of the Carolinas
3733 National Drive Suite 207 ~ Raleigh, NC ~ 27612
Phone: [phone] I Fax: [phone]
Email: ~ames.ricec~hdrinc.com
Original Message-----
From: Chad Coggins [mailto:cco~gins~?dot state.nc.us]
Sent: Tuesday, April 08, 2008 3:25 PM
To: Jimmy Marler; Rice, James R.
Subject: B-4540
Jimmy and James,
Attached is a letter I received from DWQ today. I also followed
1 of 2 4/10/2008 9:06 AM

[Fwd: B-4540]
up with an office visit to fully explain and express what we
discussed Jimmy. The response was that deck drains are not
allowed over the stream OR BUFFER anymore. So some type of BMP
will have to be designed to treat stormwater (scour hole grass
Swale etc.).
Chad Coggins
NCDOT Div. 4
Environmental Officer
252-296-3532
252-717-8699 (cell)
Content-Type: message/rfc822
RE: B-4540.em1
Content-Encoding: 7bit
Content-Description: Dissipator Pad.pdf
Dissipator Pad.pdf 'Content-Type: application/octet-stream
Content-Encoding: base64
Content-Description: b4540 hyd~sh.pdf
!b4540_hyd~sh.pdf Content-Type: application/octet-stream
': Content-Encoding: base64
'' Content-Description: b4540 hyd~sh_withcon.pdf
'b4540_hyd~sh_withcon.pdf Content-Type: application/octet-stream
'Content-Encoding: base64
2 of 2 4/10/2008 9:06 AM

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