HomeMy WebLinkAbout20140764 Ver 1_FW Shatterly Rd Bridge 229_ Stormwater_20170410
Wanucha, Dave
From:Thomson, Nicole J
Sent:Monday, April 10, 2017 9:42 AM
To:Wanucha, Dave; 'David.E.Bailey2@usace.army.mil'
Cc:Parker, Jerry A
Subject:FW: Shatterly Rd Bridge 229,
Attachments:IMG_1898.JPG; IMG_1899.JPG; IMG_1900.JPG; Sketch 1.pdf; Sketch 2.jpg
Good morning gentlemen!
As you may recall, the above bridge replacement has given us some issues with respect to drainage. I previously sent an email
with a proposed work around intended to address the storm drainage in a manner consistent with existing BMPs and the buffer
rules. As you can see from the attached pictures, it’s not working. Now this is from a heavy rainfall last week, however, even
with a moderate rainfall, the grades are working against us and the drainage isn’t going where we need it to.
After coordinating with Aaron Harper (REU), he has devised the attached plan (see the above 2 sketches and his email
explanation below).
Is this something that you could/would be ok with?
Thank you very much –
Nikki
PS if we need to meet on site, I’m game. Just flip me some available dates and we’ll get it coordinated.
From: Harper, Aaron A
Sent: Friday, April 07, 2017 12:45 PM
To: Kirkman, Christopher D <cdkirkman@ncdot.gov>; Fine, Lowell C <lcfine@ncdot.gov>; nthomson@sepiengineering.com;
Thomson, Nicole J <njthomson2@ncdot.gov>
Subject: Shetterly Rd Bridge 229
All,
I reviewed the project this morning with Don and Billy. It was noted that minor washing occurred parallel to the rip rap vicinity
EB1 Lt from the recent 0.9 inch rainfall event. Billy indicated this rainfall took place in approximately 1 hour. It is my opinion
that flow from the driveway pipe, storm drain pipe, and sheet flow from the adjacent field was more than could be managed
along the existing rip rap toe protection. Excessive runoff ponded at the pipe outlets and then flowed along the edge of the rip
rap and around the wing. This has been a challenging area to manage drainage while maintaining diffuse flow through the
buffer. It is also my opinion that over time, there would be risk of losing the integrity of the slope protection around the wing
wall if runoff continues to flow along the edge of the rip rap toe protection.
Nikki, per our phone conversation, do you think Dave would be open to the following: Grade from the pipe outlets to EB1 and
between the R/W and existing toe protection to drain. Line this new swale with geotextile and rip rap. In a line parallel with the
EB, construct a rock check with Class 1 and Class B rip rap to perform as a “level spreader” to provide diffuse flow.
In Sketch 1: The green shaded area is approximately existing rip rap. The red outline is the footprint of proposed rip rap.
In Sketch 2: The red line is the approximate location of the proposed rock check to perform as a level spreader. The green
outline is the footprint of proposed rip rap.
Please let me know if it would be beneficial to meet on site to discuss further.
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Much Thanks
Aaron Harper
Field Operations Engineer Div 7&8
NCDOT Roadside Environmental Unit
919 776 2279 office
919 777 3038 cell
aaharper@ncdot.gov
P.O. Box 429
th
1530 South 7 Street
Sanford, NC 27330
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.
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