20071818 Ver 1_Other Agency Comments_20070116

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MAILING ADDRESS: TELEPHONE: [phone] or 816.715-1334 LOCATION:
NC DEPARTMENT OF TW4FDRTATION FAX. [phone] PAkkER UNCXXH EII11„OIt4G
PROJECT DEVEL9PUENT AND ENVIRONMENTAL ANALY$15 272B GAPI IALSLVD.. SUITE 240
NATURAL ENVIRONMENT UNIT WE9S1TE: wwwAIC00T ORG RALEIGH, NC 27604
1598 MAIL SERVICE CENTEk
RA_FIGrI NC 27699-1598
DEC-19-2007 WED 09:08 TEL:[phone] NAME:DWO-WETLANDS P. 1
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DEPARTMENT OF TRANSPORTA'I ON flAf.EHIflRONMENT
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January 10, 2007
Mr. Robert G. Healy
New Hope Creek Corridor Advisory Committee
P. 0. Box 51531,
Durham. NC 27717
Dear Mr. Healy:
SUBJECT: Project: 33563.1.1 (B-4218) Orange County
F.A. Project: BRZ-1730(5)
Bridge 108 over Now Hope Creek on SR 1730
I appreciate your comments regarding the design and construction of TIP Project B-4218. Listed
below are NCDOT's responses to your comments. Our comments will follow it the same order as
your letter dated December 02, 2006.
An off-site detour is planned for the construction of this project. The off-site detour is planned to
follow the following roads- SR 1731 (Whitfieid Road), NC 86, and SR 1718 (Mt. Sinai Road).
• The new bridge is proposed to be a 2-span structure and have one bent in the creek. To span
the creek will require a significant grade change with a much longer bridge, as the 100-year
overflow will be blocked. New Hope Creek is a FEMA rogulated stream and would require a
floodway rnodification if the grade were raised. Eliminating the bent from the creek, increasing
the roadway grade, and increasing the bridge length will increase the project cost significantly.
The cleariii and grubbing operation will include areas that are necessary for protect
construction.
• HOW, ORW or WS-I or WS-11 waters are not listed for Turkey Creek in the project vicinity. There
are no federally protected species located within the study area. Therefore, standard erosion
and sedimentation measures were recommended in the Programmatic Categorical Exclusion.
However, there is a diverse mussel assemblage located in the project vicinity. Several of the
mussels found near the bridge are state listed. NCCDOT will adhere to " Design Standards in
Sensitive Watersheds" during project construction. `Design Standards in Sensitive Watersheds"
is the highest level of erosion control design. This standard requires the erosion control plans to
be designed to provide protection from the runoff of a 25 year storm event.
The proposed bridge will have at least 10 feet from the top of the creek brink to the toe of the
end bent fill slope with 8 feet of clearance from normal pool elevation.
• No decK drains will be on the proposed bridge.
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DEC-19-2007 WED 09:08 TEL:[phone] NAME:DWO-WETLANDS P. 2
DEF--29-2007 07:59 Frorn:DUT OFF OF NAT EtFJVI. 919 715 5501 To:919T336893 P.3'3
Mr. Robert G. Healy
January 10, 2007
Page 2
• Best Management Practices for Bridge Demolition & Removal will be implenientr d. Although
the timber columns for the interior bents are encased it) concrete, temporary fill is riot anticipated
with respect to bridge demolition. All other components will be removed without dropping
components into New Hope Creek during construction.
• Below is a typical section of the bridge. The bridge will have two ten (10') foot vehicular travel
lanes and 3'-85' offsets on each side. The proposed shoulder widths will be usable by both
pedestrians and bicyclists. The bridge will not Have sidewalks.
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• Ms. Sarah McRae of the Natural Heritage Program was contacted concerning the project. She
said that the project is located in an area identified as the New Hope Creek Floodplain
Macrosite. This macrosite has state significance most likely because of the mussel diversity
found at the site. She recommended that efforts be made to reduce sedimentation during
construction and recommended that Design Standards in Sensitive Watersheds be used during
project construction. Again, NCDOT will adhere to " Design Standards in Sensitive Watersheds"
during project construction,
Agair, we appreciate your comments and concern regarding the project. NCDOT values the public's
comments as we design and construct our projects in a manner that both enhances the citizens'
safety and provides a strong environmental commitment.
Please note that these plans are still preliminary and s ub ect to change without notice.
If you have questions or concerns regarding the project work, please contact Mr, Robert J. Stroup,
PE, Project Design Engineer, or me, at 919-250-4016.
Sincerely,
Cathy S. ouser, PE
Project Engineer - Roadway Design
CSH/rjs
cc: Mr. Mika Mills, PE, Division 7
Mr. Tracy Walter, Project Development & Environrrrental Analysis Branch
Ms. Susan Thebert, Natural Enviroment Unit
File
DEC-19-2007 WED 09:06 TEL:[phone] NAME:DWO-WETLANDS P. 3
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