20141135 Ver 1_Email_32010110

Johnson, Alan
From:Johnson, Alan
Sent:Monday, November 03, 2014 12:56 PM
To:'Phillips, Brandon'; Larry Thompson ([e-mail])
Cc:Honeycutt, Nikki T.; Iagnocco, Michael; O’Mahony, Ryan E.
Subject:RE: Cox Rd bridge replace
I think that would be prudent. The base flow of the stream doesn’t appear to require both barrels to pass flow. A sill
and bench seems appropriate.

Thanks
Alan

From: Phillips, Brandon [mailto:[e-mail]]
Sent: Monday, November 03, 2014 12:36 PM
To: Johnson, Alan; Larry Thompson ([e-mail])
Cc: Honeycutt, Nikki T.; Iagnocco, Michael; O’Mahony, Ryan E.
Subject: RE: Cox Rd bridge replace

Alan,

The CSR for the R.69 bridge replacement over Cox Road was prepared by Jerry Lindsey of the NCDOT (attached .pdf),
and he determined the use of the double corrugated steel pipes was proper for this bridge replacement. Generally,
these small bridges with vertical abutments cannot be replaced with the same length bridge because of the required
setbacks and the spill-thru abutments. Therefore, it is not economical to build a large bridge for a small tributary
crossing. Also, the roadway geometry and the topography has caused some constraints that are better addressed by the
use of the double pipes.

At your request, we can ask Jerry Lindsey of the NCDOT if we can add a sill to the high flow pipe to maintain the low flow
channel through one pipe without compromising the hydraulic design. Please let me know if you would like me to
pursue this with Mr. Lindsey and the NCDOT.

Thanks,

Brandon J. Phillips, C.H.M.M.

Senior Scientist

[e-mail]

STV/Ralph Whitehead Associates, Inc. | 900 West Trade Street, Suite 715 | Charlotte, NC 28202-1144 | [phone] | (704)

372-3393 (fax)
| www.stvinc.com

From: Johnson, Alan [mailto:[e-mail]]
Sent: Wednesday, October 29, 2014 3:25 PM
To: Larry Thompson ([e-mail])
Cc: Phillips, Brandon

Subject: Cox Rd bridge replace

They are replacing the bridge with two 10 ft diameter pipes (round). The diagram doesn’t show a bench for one of the
pipes.

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Currently an 18 ft span, but the stream isn’t that big. It should be able to flow through a single pipe under typical flow

Thanks.

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