DWR Comments

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September 13, 2018
MEMORANDUM
To: Toininy Register, Project Manager, TGS EngineErs
�ocuSigned by:
From: Dave Wanucha, NC Division of Water Resources, Winston Salem Offic �� �"� g�13/2018
89736FD146FE4AD...
Subject: Proposed Reali�nment of Intersection at Deerfield Road and Meadowview Drive in the Town of Boone,
NC; STIP R-5874.
Reference your electronic correspondence dated September 5, 2018 in which you i-equested comments for the
referenced project. Preliminary analysis of the project reveals the potential for multiple impacts to sh-eams and
jurisdictional wetlands in the project area. More specifically, impacts to:
Stream Name River Basin Stream Stream Index 303(d) Listing
Classification(s) Number
Middle Fork of South Fork New River W S-N; CA + 10-1-2-(15)
New No
Winlder Creek C; Tr+ 10-1-4-(3.5)
F'urther investigations at a higher resolution should be undertaken to verify the presence of other streams and/or
jurisdictional wetlands in the area. lf any j�u•isdictional areas are identified, the Division of Water Resources
requests that NCDOT and their consultants consider the following environmental issues for the proposed project.
General Project Comments:
Flirther environmental documents should provide a detailed and itemized presentation of the proposed impacts
to wetlands and streams with corresponding mapping. lf mitigation is necessary as reqture�d by 15A NCAC
2H.0506(h), it is preferable to present a conceptual (if not finalized) mitigation plan with the enviromnental
documentation. Appropriate mitigation plans will be required prior to issuance of a 401 Water Quality
Certification.
Review of the project reveals the presence of surface waters classified as Water Supply Critical Area in the
project stucly area. Given the potential for impacts to these resources during the project implementation, the
NCDWR requests that NCDOT strictly adhere to North Carolina regulations entitled Design Stm��dards in
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North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 2 7 699-161 7
919.707.9000

Serisitive Wate��shecls (1 SA NCAC 04B .0124) throughout design and construction of the project. This would
apply for any area tl�at draii�s to str-eauls haviug WS CA (Water Supply Ci•itical Area) classificatio�ns.
3. For Trout (Tr) waters of the State, NCDWR recommends tl�at the most protecrive sediment and erosion
conh-ol BMPs be implemei�ted to reduce the risk of turbidity violarions in h•out waters. In addition, all
dishirbances within trout buffers should be conducted in accordai�ce wit11 NC Division of Land Resources and
NC Wildlife Resource�s Com�nission require�nents.
4. Iu accordance with the Environmental Manage�ment Coi11i11ission's Rules (15A NCAC 2H.0506[h]),
miti�ation will be required for impacts of greater tl�an 300 linear feet to any pere»nial stream. In the event
that mitigation is required, tl�e ir�itigation plan shall be designed to replace appropriate lost fimetions and
valLies. The North Carolina Division of Mitigatiou Seivices may be available for assistance with stream
mitigation.
5. Fut�ire docLnnentation, including the 401 Water Quality Certificarion Application, shall continlie to inclLide an
iteinized listing of the proposed wetlaud ai�d stream impacts with corresponding ma�ping.
6. The NCDWR is very concerned with sediment and erosion impacts that could result fi-om this project. Tlie
NCDOT shall address these concerns by describing the potential impacts that may occur to the ac�uatic
environmeilts and any mitigating factois that would reduce the impacts.
7. The NCDOT is respectfiilly remii�ded that all impacts, inclLiding b�it not limited to, bridging, fill, excavatioi�
and clearing, ai�d rip rap to jurisdictional wetlands, streams, and riparian buffers need to be included in the
final in�pact cale�ilations. These i�npacts, in addition to any construction impacts, temporary or otherwise,
also need to be included as part of the 401 WaYer QLiality Certification Application.
8. Whenev�r possible, the NCDWR prEfErs spanning sh-uctw-es. Spanning structures usually do not reqLiire
work within the sh-eam or grubbing of tl�e sn-Eambanlcs and do not require sn-ea�n cl�annel realignment. The
horizontal and vertical clearances provided by bridges sh�ll allow for hLmian and wildlife passage beneath the
sn-ucture. Fish passage and n�vigation by canoeists and bo�ters shall not be blocked. Bridge supports (bents)
should not be �laced in the stream when possible.
9. Sediment and erosion control measures sho�ilcl not be placed in wetlands or streains.
10. Borrow/waste areas sho�ild avoid wetlands to the maximum extent practicaL Impacts to wetlands in
borrow/waste areas will need to be presented in the 401 Water Quality Certification ancl could precipitate
compensatory mitigation.
11. The 40] Water Qualiry Certificatioi� applicarion will need to specihcally address the proposed methods for
stormwater management. More specifically, stormwater shall not be permitted to discharge directly into
sh-eams or surface waters. To meet the requirements of NCDOT's NPDES permit NCS000250, please refer
to the most recent version of the No��th Carolii�a Depcu�tmenl of'Transpo��tcePion Storn��a-ater� Best Mun«genaeflt
Pr•cactices Toolbox manual for approved measures.
12. Basecl on the inforination presented in tl�e document, the magnitude of iin�acts to wetlands and streams inay
require a Nationwide (NW) application to tl�e Corps of Engineers and corresponding 401 Water Quality
Certification. Please be advised that a 401 Water Quality Certification requires satisfactory protection of
water quality to ensure that water quality standards are met and no wetland or stream uses are lost. Final
permit authorization will require the submittal of a formal application by the NCDOT and written concun-ence
fi-om the NCDWR. Please be aware that any approval will be contingent on appropriate avoidance and
minii�ization of wetland and stream impacts to the maximum extent practical, the development of an
acceptable stoT��iwater management plan, and the inclusion of appropriate mitigation plans where appropriate.
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North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 27699-1617
919.707.9000

13. If concrete is us�d during construction, a dry work area shall be i��aintained to preve��t 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 ]cills. Concrete shall
be handled in accordance with tl�e NPDES Consh-uction General Permit NCGO 10000.
14. lf temporary access roads ar detours are constructed, the site sl�all be graded to its preconstruction contours
and elevations. Dishn•bed areas shall be seeded or mulched to stabilize tl�e soil and appropriate narive woody
species shall be planted. When using temporary shuctures, the area shall be cleared but not grubbed.
Clearing the area with chain saws, n�owers, bush-hogs, or otl�er mechanized e�quipment and leavii�g the
sh�mps and root mat i»tact allows the area to re-vegetate ilaturally and n�ini��lizes soil disturbauce.
15. Unless otherwise authorized, placement of culverts and other sh-uctures ii� waters and streams shall be placed
below the elevation of the streai��bed by one foot for all culverts with a diameter greater tl�an 48 incl�es, and
20 percent of the culvert diameter for culverts having a diameter less thau 48 inches, to allow low tlow
passage of water and aquatic life. Design and placement of culverts and other struchu-es including temporaiy
erosion control measures shall not Ue conducted in a manner that inay result in dis-equiliUrium of wetlands or
sh•eambeds or bai�lcs, adjaceilt to or upsh-eam aild downstream of tl�e above structures. Tl�e applicant is
required to provide evidence tl�at the equilibriuin is being maintained if rEque�sted i�� wi-itii7g by the NCDWR.
If tl�is coudition is unable to be inet due to bedrock or other limiting feahues encountered dm-ing construction,
please contact the NCDWR for guidance on how to proceed and to determine whether or not a perinit
modification will be reqltired.
16. If multiple pipes or barrels are required, they shall be designed to mimic natural stream cross section as
closely as possible including pipes or barrels at flood plain elevation, floodplain benches, and/or sills may be
required where appropriate. Wideuin� the stream chai�nel should be avoided. Stream chamlel widening at the
inlet or outlet end of sn•uct�ires typically decreases water velocity causing sedime;nt deposition that requires
increased m�intenance and disrupts ac�liatic life passage.
17. If foundation test borings arE necessary; it shal l be noted in the document. Geotechnic�l work is ap�roved
tmder General 40l Certification Nuinber 4085/Nationwide Per�nit No. 6 for Smvey Activities.
18. Sediment and erosion control measures sufficient to protect water resources inust be implemented and
maintained in accordance with the most recent version of North Carolina Sediment and Erosion Control
Plamung and Design Manual and the most recent version of NCS000250.
19. All work in or adjacent to stream waters shall be condlicted in a dry work area. Approved BMP ineasures
from the most current version of the NCDOT Construction and Mainten�nce Activities inan�ial such as
sandbags, rock berms, cofferdams and other diversion smictures shall be used to prevent excavation in
flowing water.
20. Heavy equipment should be operated fro�1� the banl< rather than in sn�eam channels in order to minimize
sedimentatioi� and reduce the likelihood of i�ltroducing other pollutants into streams. This equipnlent shall be
inspected daily and maintained to prevent contamination of surface waters from lealcing fuels, lubricants,
hydralilic fluids, or other toxic materials.
21. Riprap shall not be placed in the active thalweg channel or placed in the streambed in a manner tliat precludes
aquatic life passage. Bioengineering boulders or structures shotiilcl be properly designed, sized aud installed.
22. Riparian vegetation (native trees and shnibs) shall be preseived to the maximum extent possible. Riparian
vegetation must be reestablished within the construction limits of the pr-oject by the end of the growing season
following completion of constTliction.
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���,�,�..:�„�-�,�.-
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 27699-1617
919.707.9000

Thank you for t-ec�uesting our input at this time. The NCDOT is reminded that issuance of a 401 Water Qliality
Certification requires that appropriate measures be instiiuted to ensure that water quality standards are n�et and
designated uses are not degraded or lost If you have any questions or require addirional infonnation, please contact
Dave Wanucha at [phone] or [e-mail].
Electronic copy only distribution:
Steve Kichefsky, US Army Coips of Engineers, Asheville Field Office
File Copy
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North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street I 1617 Mail Service Center � Raleigh, North Carolina 2 7 699-161 7
919.707.9000