20170834 Ver 1_DWR Comments_20170331

Environmen tal
Quality
ROY COOPER
Gu��c�rnur
MICHAEL S. REGAN
Sr�c ��e�<<n�
S. JAY ZIMMERMAN
r��, �-<�r�,�
March 31, 2017
MEMORANDUM
TO: Ti��i Powers, Division Brid�e Program Manager, NCDOT ([e-mail])
FROM: Dave Wan�icha, NC Division of Water Resources, Winston Salem ReQional Office��
SUBJECT: Scoping Review of NCDOT's Prol�osed Bridge Replacement Projects: B-4958 and B-5715 Guilford and
Rockingha�n Counties
In reply to your correspondence dated March 21, 2017 in wlvch you requested cominents for the above referenced projects listed in
Table 1 below, the NC Divisioi� of Water Resources offers the following comments:
Table 1. Pertiuei�t infarmatiou related to streams likely to be
�, Bridge Stream Index No
B-4958 Reedy Fork and
UTs to Reedy Fork
B-5715 Haw River and UTs to Haw
River
16-11-(I)
16-(I)
cted by tlie pr
Classification
WS-IIi; NSW
WS-V; NSW
Status
Perennial
Perennial
Subject to Buffer
and Mitigation
Rules
Yes
Yes
1. Reedy Fork and the Haw River and their tributaries are nutrient sensitive waters (NSW) of the� State. NCDWR is very concerned
with sediment and erosion impacts that could result from this project. NCDWR recommends Chat highly protective sediment and
erosiou control BMPs be implemented to reduce the i7sk of nuCrient runoff to those streams. NCDWR requests that road design
plans provide treatment of the storm water runoff through best man�gement practices as detailed in the most recent version of
NCDWR's Stor•mti��c�ter Best Mar�agemerit P��actices.
2. This project is within the Jordan Lake Watershed. Riparian buffer impacts shall be avoided and minimized to the greatest extent
possible pursu�nt 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
unclersrood that final designs are not determined at the time the CE is developed. However, the CE sho�ild discuss the potential
for dewatering and access measures necessary due to bridae construction.
4. The NCDWR is very concerne�d with sediment �ind erosion impacCs that could result from this project. NC DOT shall address
these� concerns by describing the potential impacCs th�t may occur to the aquatic environments and any mitigatina factors that
would red��ce the impacts.
5. If fom�dation test boriu�s are necessary; it shall be noCed in the document. Geotechnical work is approved under General 401
Certification Number 3883/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 ofi Ei�gineers to determine the required permit(s).
,'"i�lr�if3i��� C:c�f����.�rt.�
Statc of NoiYh Carolina I Environmental Quality
1617 Mail Scivice Centcr I Raleiah, Nurth C�uolina 27699-1617

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, the 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 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.
9. 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 native woody species shall be planted. When
using temparary 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 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.
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, or other toxic materials.
16. 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.
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
Dave. Wanucha @ ncdenr.gov.
Electronic copy only distribution:
Dave Bailey, US Army Corps of Engineers, Raleigh Field Office
Aileen Mayhew, Project Manager, Mott MacDonald ([e-mail])
NC Division of Water Resources Raleigh Central Office
File Copy