20181277 Ver 1_Scoping Comments_20180214

Environmental
Quality
February 7, 2018
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
MEMORANDUM
TO: Rebecca Jackson, NC Department of Transportation
FROM: April Norton, NC Division of Water Resources, Central Office
SUBJECT: Scoping Review of NCDOT's Proposed Bridge Replacement Project: Bridge 240, Guilford County
In reply to your correspondence dated and received January 26, 2018 in which you requested comments for the above
referenced projects, the NC Division of Water Resources offers the following comments:
Project-Specific Comments:
WBS Element 17BP.7.R.113 — Replace Bridge No. 240 on SR 3285 over Little Alamance Creek, Guilford
County
1. Little Alamance Creek is classified as WS-IV; NSW waters of the State. NCDWR is very concerned with
sediment and erosion impacts that could result from this project. NCDWR recommends that highly protective
sediment and erosion control BMPs be implemented to reduce the risk of nutrient runoff to Little Alamance Creek.
NCDWR requests that road design plans provide treatment of the storm water runoff through best management
practices as detailed in the most recent version of NCDWR's Stormwater Best Management Practices.
2. This project is within the Jordan River Basin. Riparian buffer impacts shall be avoided and minimized to the
greatest extent possible pursuant to 15A NCAC 2B 0267.
3. Any anticipated dewatering or access structures necessary for construction of bridges should be addressed in the
CE. It is understood that final designs are not determined at the rime the CE is developed. However, the CE
should discuss the potential for dewatering and access measures necessary due to bridge construction.
4. Again, NCDWR is very concerned with sediment and erosion impacts that could result from this proj ect. NCDOT
shall address these concerns by describing the potenrial impacts that may occur to the aquatic environments and
any mitigating factors that would reduce the impacts.
5. If foundation test borings are necessary; it shall be noted in the document. Geotechnical work is approved under
Genera1401 Certification Number 4132/Nationwide Permit No. 6 for Survey Activities.
6. If a bridge is being replaced with a hydraulic conveyance other than another bridge, the NCDWR believes the use
of a Nationwide Permit may be required. Please contact the US Army Corp of Engineers to determine the required
permit(s).
7. If the old bridge is removed, no discharge of bridge material into surface waters is allowed unless otherwise
authorized by the USACE. Strict adherence to the Corps of Engineers guidelines for bridge demolition will be a
condition of the 401 Water Quality Certification.
8. Whenever possible, NCDWR prefers 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 and
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State of North Carolina I Environmental Quality
1617 Mail Service Center I Raleigh, North Carolina 27699-1617

vertical clearances provided by bridges allow for human and wildlife passage beneath the structure, do not block
fish passage and do not block navigation by canoeists and boaters.
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-formed scour holes, vegetated buffers, etc.)
before entering the stream. Please refer to the most current version of NCDWR Stormwater Best Management
Practices.
10. 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.
11. Bridge supports (bents) shall not be placed in the stream when possible.
12. 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 narive 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.
13. 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.
14. All work in or adjacent to stream waters shall be conducted in a dry wark 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.
15. 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, ar other toxic materials.
16. In most cases, 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 elevarion. The area shall be stabilized with
grass and planted with native tree species. Tall fescue shall not be used in riparian areas.
Thank you for requesting our input. NCDOT 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 April Norton at (919) 707-
9111 or April.Norton(a�NCDENRgov.
Sincerely,
1 , � � rI
Electronic copy only distribution:
David Bailey, US Army Corps of Engineers, Raleigh Field Office
File Copy