20191467 Ver 1_B-5323-Scoping_20170427

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Enviranmen.tal
Qualrty
ROY COOPER
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MICHAEL S. REGAN
Secreturr
S. JAY ZIMMERMAN
Dirc�rrur
April 27, 2017
MEMORANDUM
TO: Ada�n H. Karagosian, PWS, WSP Parsons Brinckerhoff
FROM: Rob Ridings, NC Division of Water Resources, Trai�sportation Permitting Branch
SUBJECT: Scoping Review of NCDOT's Proposed Bridge Replacement Project: B-5323 (Granville
Count,y),
In reply to your coi�respondence received April 18, 2017 in which you requested comments for the aUove referenced
project, the NC Division of Water Resources offers the following comments:
Project-S�ecific Comments
Johnson Creek is class B waters of the State. NCDWR is very concerned with sedin�ent and erosion iinpacts
that could result from tl�is project. NCDWR recommeuds that highly protective sediment and erosion control
BMPs be implemented to reduce the risk of nutrient ninoff to Jolv�son Creek, and the Kerr Reservoir. NCDWR
reqliests that road design plails provide treatment of tl�e storm water nmoff through best management practices
as detailed in the most recent version of NCDWR's Stor•mwater• BestManagernent P�-actices.
Any anticipated dewatering or access structures necessary for construction of bridges should Ue addressed in the
CE. It is uuderstood that final designs are not determined at the time the CE is developed. However, the CE
should discuss the potential for dewatering and access me�sures necessary due to bridge consh-uction.
General Comments Regarding Bridge Replacement Projects
3. The NCDWR is very concerned with sediinent and erosion impacts that could result from this project. NC DOT
shall address these concerns by describing fl1e potential impacts that may occur to the aquatic enviromnents and
any mitigating factors that would reduce the impacts.
4. If fotmdation test borings are ilecessary; it shall be noted in the doc�unent. Geotechnical worlc is approved Lmder
General 401 Certification Nlimber 3 883/Nationwide Permit No. 6 for Survey Activities.
5. If the o1d bridge is removed, no discharge of bridge material into surface waters is allowed unless otherwise
authorized by the US ACOE. Strict adherence to the Corps of Engineers guidelines for bridge demolitioi� will be
a condition of the 401 Water Quality Certification.
6. Whenever possible, the NCDWR prefers spanning structures. Spanning structtues usually do not require work
within the stream or grubbing of the stream banlcs and do not require stream channel realignment. The
l�orizontal and vertical clearances provided by bridges allow for huinan and wildlife passage beneath the
stntcture, do not block fish passage and do not Ulock navigation by canoeists and boaters.
7. Bridgc deck drains shall not discharge directly into the strean7. Storinwater shall be directed across the bridge
and pre-treated through site-appropriate means (�,n-assed swales, pre-formed scour holes, vegetated buffers, etc.)
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Stafe of Narth Carolina I F,nvironmental Quality
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before entering the stream. Please refer to the most current version of NCDWR Stormwater Best Management
Practices.
8. 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.
9. Bridge supports (bents) shall not be placed in the stream when possible.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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.
15. 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.
16. Any anticipated bank stabilization associated with culvert installations or extensions should be addressed in the
Categorical Exclusion (CE) document. It is understood that final designs are not determined at the time the CE
is developed. However, the CE should discuss the potential for bank stabilization necessary due to culvert
installation.
17. Bridge piles and bents shall be constructed using driven piles (hammer or vibratory) or drilled shaft construction
methods. Mare specifically, jetting or other methods of pile driving are prohibited without priar written
approval from the NCDWR first.
18. No drill slurry or water that has been in contact with uncured concrete shall be allowed to enter surface waters.
This water shall be captured, treated, and disposed of properly.
19. A turbidity curtain will be installed in the stream if driving or drilling activities occur within the stream channel,
on the stream bank, or within 5 feet of the top of bank. This condition can be waived with prior approval from
the NCDWR.
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
Rob Ridings at 919-707-8786.