20161129 Ver 1_justification for CORPS_20161116

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Transportation
October 20, 2016
Andrew Wiliiams
Regulatory Project Manager
US Army Corps of Engineers
3331 Heritage Trade Drive, Suite 105
Wake Forrest, NC 27587
PAT McCR4RY
Governor
NICHULAS J. TENNYSUN
Secretary
Subject: Bridge 129 in Randolph County, SR 2407 over Branch of Sandy Creek
Dear Mr. Williams:
Please let this serve as written justification as to why a culvert was chosen to replace the subject
deteriorated bridge. The location of the existing y-line (Herman Husband Road) is too close to
the existing bridge to allow for the minimum length of a guardrail anchor unit to protect vehicles
from hitting the parapet wall of a new bridge. For your information, the guardrail anchor unit
would need to be a minimum of 50 feet to meet design standards. A proposed bridge would
need to be approximately 70 feet in length to satisfy construction and hydraulic design
standards. Herman Husband road is approximately 42 feet from the existing bridge. Also, there
is some concern about the anticipated Greensboro/Randolph Megasite (planned for this area)
generating enough truck traffic to cause problems for our typical cored slab bridge design. A
steel girder bridge, which would meet the demands of high volume truck traffic, would not work
hydraulically at this location.
Thank you for your time and consideration in dealing with this matter. Please let me know if
you need additional information.
Sincerely
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T.F. Welch, PE
Division 8 Bridge Program Manager
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cc: Art King, Division 8 Environmental Engineer
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State of North Carolina � Department of Transportation � Division 8
902 N. Sandhills Blvd. � Aberdeen, N.C. 28315
910-944-2344 T