20171575_Division 9 Bridge Scopes_November_20161101

PAT MCCRORY
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DONALD R. VAN DER VAART
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E'nvironmental JAY ZTMMERMAN
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November l , 2016
MEMORANDUM
TO: Pamela Williains, NCDOT
FROM: Dave Wanucha, NC Division ofi Water Resources, Winston Salem Office�(.�
SUBJECT: Scoping Review of NCDOT's Proposed Bridge Replacement Projects in Division 9.
In reply to your electronic correspondence dated October 26, 2016 in which you requested comments for the projects
in Table 1 below, the NC Division of Water Resources offers the following comments:
Table 1.
in Division 11.
Bridge � County � Road � Stream � Index Number
280-031 Davidson NC 8 Lick Creek* 12-126-(3)
280-055 Davidson NC 47 Flat Swamp Creek 12-123
280-082 Davidson NC 47 Lick Creek 12-126-(0.5)
290-050 Davie SR 1411 Dutchmans Creek 12-102-(2)al
290-078 Davie SR 1338 Hunting Creek 12-108-16-(0.5)
Notes: Lick Creek is listed on 303(ci) List for Fish and Benthos.
Stream
Classification
WS-IV
C
C
C
WS-Iii
River Basin
Yadkin PeeDee
Yadkin PeeDee
Yadkin PeeDee
Yadkin PeeDee
Yadkin PeeDee
The NCDWR is very concerned with sediment and erosion impacts that could result from this project. NC DOT
shall address these concerns by describing the potential impacts that may occur to the aquatic environments and
any mitigating factors that would reduce the impacts.
2. Tf foundation test borings are necessary; it shall be noted in the document. Geotechnical work is approved under
Genera1401 Certification Number 3883/Nationwide Permit No. 6 for Survey Activities.
3. If a bridge is being replaced with a hydraulic conveyance other than another bridge, the NCDWR believes the use
of a Nationwide PermiY may be required. Please contact the US Army Corp of Engineers (USACE) to determine
the requn-ed permit(s).
4. If the old bridge is removed, no discharge of bridge material into surfiace waters is allowed unless otherwise
authorized by the USACE. Strict adherence to the guidelines for bridge demolition will be a condition of the 401
Water Quality Certification.
5. Whenever possible, the NCDWR prefiers spanning structures. Spanning structures usually do not require work
within the stream or grubbing of the stream banks and do not require stream channel realignment The
horizontal aud vertical clearances provided by bridges allow for human and wildlife passage beneath the
str��cture, do not block fish passage and do noY block navigation by canoeists and boaters.
6. Bridge deck drains shall not discharge directly into the stream. Stormwater shall be directed across the bridge
and pre-treated through site-appropriate means (grassed swales, pre-farmed scour holes, vegetated buffers, etc.)
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State of North Carolina I Environmental Qaality
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before entering the stream. Please refer to the most current version of NCDWR Stormwater Best Management
Practices.
7. If concrete is used during construction, a dry work area shall be maintained to prevent direct contact between
curing concrete and stream water. Water that inadvertently contacts uncured concrete shall not be discharged to
surface waters due to the potential for elevated pH and possible aquatic life and fish kills.
8. Bridge supports (bents) shall not be placed in the stream when possible.
9. If temporary access roads or detours are constructed, the site shall be graded to its preconstruction contours and
elevations. Disturbed areas shall be seeded or mulched to stabilize the soil and appropriate native woody
species shall be planted. When using temporary structures the area shall be cleared but not grubbed. Clearing
the area with chain saws, mowers, bush-hogs, or other mechanized equipment and leaving the stumps and root
mat intact allows the area to re-vegetate naturally and minimizes soil disturbance.
10. Sediment and erosion control measures sufficient to protect water resources must be implemented and
maintained in accordance with the most recent version of North Carolina Sediment and Erosion Control
Planning and Design Manual and the most recent version of NCS000250.
11. All work in or adjacent to stream waters shall be conducted in a dry work area unless otherwise approved by the
NCDWR. Approved BMP measures from the most current version of NCDOT Construction and Maintenance
Activities manual such as sandbags, rock berms, cofferdams and other diversion structures shall be used to
prevent excavation in flowing water.
12. Heavy equipment shall be operated from the bank rather than in stream channels in order to minimize
sedimentation and reduce the likelihood of introducing other pollutants into streams. This equipment shall be
inspected daily and maintained to prevent contamination of surface waters from leaking fuels, lubricants,
hydraulic fluids, or other toxic materials.
13. In most cases, the NCDWR prefers the replacement of the existing structure at the same location with road
closure. If road closure is not feasible, a temporary detour shall be designed and located to avoid wetland
impacts, minimize the need for clearing and to avoid destabilizing stream banks. If the structure will be on a
new alignment, the old structure shall be removed and the approach fills removed from the 100-year floodplain.
Approach fills shall be removed and restored to the natural ground elevation. The area shall be stabilized with
grass and planted with native tree species. Tall fescue shall not be used in riparian areas.
14. Placement of culverts and other structures in waters, streams, and wetlands shall be below the elevation of the
streambed by one foot far all culverts with a diameter greater than 48 inches, and 20 percent of the culvert
diameter for culverts having a diameter less than 48 inches, to allow low flow passage of water and aquatic life.
Design and placement of culverts and other structures including temporary erosion control measures shall not
be conducted in a manner that may result in dis-equilibrium of wetlands or streambeds or banks, adjacent to or
upstream and downstream of the above structures. The applicant is required to provide evidence that the
equilibrium is being maintained if requested in writing by the NCDWR. If this condition is unable to be met
due to bedrock or other limiting features encountered during construction, please contact the NCDWR far
guidance on how to proceed and to determine whether or not a pernut modiiication will be required.
15. If multiple pipes or barrels are required, they shall be designed to mimic natural stream cross section as closely
as possible including pipes ar barrels at flood plain elevation and/or sills where appropriate. Widening the
stream channel shall be avoided. Stream channel widening at the inlet or outlet end of structures typically
decreases water velocity causing sediment deposition that requires increased maintenance and disrupts aquatic
life passage.
16. Riprap shall not be placed in the active thalweg channel or placed in the streambed in a manner that precludes
aquatic life passage. Bioengineering boulders or structures shall be properly designed, sized and installed.
Thank you for requesting our input at this time. The DOT is reminded that issuance of a 401 Water Quality
Certification requires that appropriate measures be instituted to ensure that water quality standards are met and
designated uses are not degraded or lost. If you have any questions or require additional information, please contact
Dave Wanucha at [phone] or at [e-mail].

Electronic copy only distribution:
John Thomas, US Army Corps of Engineers, Raleigh Field Office
NC Division of Water Resources Raleigh Central Office
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