HomeMy WebLinkAboutU-5815-Scoping.pdfROY COOPER
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MICHAEL S. REGAN
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Environmental LINDA CULPEPPER
(zUClllty Ln�eri�n Drrec�or
November 6, 2017
MEMORANDUM
To
From:
Jeffrey L. Teague, PE, NCDOT, Division 8 Project Manager
April Norton, NC Division Water Resources, Trai�sportation Permitting Unit
S�ibject: Sco�ing comments for U.S. 1(N. SandhilLs Bo�ilevard) from Old U.S. 1 to Roseland Road (SR 1112),
located in the Aberdeeu and So�ithern Pines, Moore County; WBS 54041.1.FR1, STIP U-�815.
A request for comments dated October 26, 2017 for tl�e subject pro�erty was received on October 26, 2017.
Preliminary anaLysis of the project reveals the potential for n�ultiple impacts to streams and jurisdictional wetlands in
th� project area. More specifically, potential impacts to:
Stre�am Name River Basin & Stream Stream Index Number 303(d) Listing?
Subbasin Classifications
Aberdeen Creek Liimber C 14-2-11-(6) No
Devi] Gut Branch Lumber C 14-2-11-7 No
Aberdeen Creek Lwnber B 14-2-11-(5) No
(Aberdeen Lal<e)
McDeeds Creek Cape Fear WS-IlI; HQW 18-23-11-4 No
(CPF14)
Furtl�er investigations at a higher resollition should be l�ndertaken to verify tl�e presence of othec streams and/or
jluisdictional wetlands in t1�e area. If any jurisdictional areas are identified, the Division of Water Resources reqiiests
that NCDOT consider the following environmental issues for the proposed project
Project Specific Comments:
Review of the �roject reveals flie presence of surface waters classified as WSIlI; HQW. High Quality Waters of
the State are within the vicinity of the project study area. This is one of the highest classiiications for water
quality.
General Project Comments:
The environmental document should provide a detailed and itemized presentation of the proposed impacts to
wetlands and streains with corresponciing mapping. lf initigation is necessary as required by 15A NCAC
2H.0506(h), it is preferable to present a conceptual (if not iinalized) mitigation plan with the environmental
documentation. Appropriate mitigation plans will be required prior to issuance of a 401 Water Qualiry
Certification.
Environ�r�ei�tal impact statement alternatives shall consider design criteria that reduce the impacts to stre�ms
and wetlands fi-oin storm water runoff. These alternatives shall include road designs that allow for treatment of
the storm water ninoff through best ma��agement practices as detailed in the most recent version of the North
Carolir�a De�ctr�tn�ent o�� Transpor-Cc�tiora Stor•rntivater� Best Managemer�t Prctctr�ces Tool box manual, such as
grassed swales, buffer areas, preformed scour holes, retention basins, etc.
�Ne�thi�g �:+n�re�aa�e� - -
State of Noitli Carolina I Enviromnental Quality
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
After the selection of the preferred alternative and prior to an issuance of the 401 Water Quality Certification,
the NCDOT is respectfully reminded that they will need to demonstrate the avoidance and minimization of
impacts to wetlands, buffers, and streams to the maximum extent practical. In accordance with the
Environmental Management Commission's Rules (15A NCAC 2H.0506[h]), mitigation will be required for
impacts of greater than 1 acre to wetlands. In the event that mitigation is required, the mitigation plan shall be
designed to replace appropriate lost functions and values. North Carolina Division of Mitigation Services may
be available for assistance with wetland mitigation.
4. In accordance with the Environmental Management Commission's Rules (15A NCAC 2H.0506[h]), mitigation
will be required for impacts of greater than 3001inear feet to any perennial stream. In the event that mitigation
is required, the mitigation plan shall be designed to replace appropriate lost functions and values. The North
Carolina Division of Mitigation Services may be available for assistance with stream mitigation.
5. Future documentation, including the 401 Water Quality Certification Application, shall continue to include an
itemized listing of the proposed wetland and stream impacts with corresponding mapping.
6. The NCDWR is very concerned with sediment and erosion impacts that could result from this project. The
NCDOT 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.
7. An analysis of cumulative and secondary impacts anticipated as a result of this project is required. The type
and detail of analysis shall conform to the NC Division of Water Resource Policy on the assessment of
secondary and cumulative impacts dated April 10, 2004.
8. The NCDOT is respectfully reminded that all impacts, including but not limited to, bridging, fill, excavation
and clearing, and rip rap to jurisdictional wetlands, streams, and riparian buffers need to be included in the final
impact calculations. These impacts, in addition to any construction impacts, temporary or otherwise, also need
to be included as part of the 401 Water Quality Certification Application.
9. Where streams must be crossed, the NCDWR prefers bridges be used in lieu of culverts. However, we realize
that economic considerations often require the use of culverts. Please be advised that culverts should be
countersunk to allow unimpeded passage by fish and other aquatic organisms. Moreover, in areas where high
quality wetlands or streams are impacted, a bridge may prove preferable. When applicable, the NCDOT should
not install the bridge bents in the creek, to the maximum extent practicable.
10. Whenever possible, the NCDWR prefers spanning structures. Spanning structures usually do not require work
within the stream or grubbing of the streambanks and do not require stream channel realignment. The harizontal
and vertical clearances provided by bridges shall allow for human and wildlife passage beneath the structure.
Fish passage and navigation by canoeists and boaters shall not be blocked. Bridge supports (bents) should not
be placed in the stream when possible.
11. 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. To meet the requirements of NCDOT's NPDES permit NCS0000250, please refer
to the most recent version of the North Carolina Department of Transportation Stormwater Best Management
Practices Toolbox manual for approved measures.
12. Sediment and erosion control measures should not be placed in wetlands or streams.
13. Borrow/waste areas should 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 and could precipitate
compensatory mitigation.
14. The 401 Water Quality Certification application will need to specifically address the proposed methods for
stormwater management. More specifically, stormwater shall not be permitted to discharge directly into
streams, buffers, or surface waters.
15. 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.
16. 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.
17. Unless otherwise authorized, placement of culverts and other structures in waters and streams shall be placed
below the elevation of the streambed by one foot for 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, adj acent 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 for guidance on how to proceed and to determine whether or not a permit modification
will be required.
18. 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. Widening the stream channel should 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.
19. If foundation test borings are necessary; it shall be noted in the document. Geotechnical work is approved under
Genera1401 Certification Number 4085/Nationwide Permit No. 6 for Survey Activities.
20. 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.
21. All work in or adjacent to stream waters shall be conducted in a dry work area. Approved BMP measures from
the most current version of the 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.
22. While the use of National Wetland Inventory (NWI) maps, NC Coastal Region Evaluation of Wetland
Significance (NC-CREWS) maps and soil survey maps are useful tools, their inherent inaccuracies require that
qualified personnel perform onsite wetland delineations prior to permit approval.
23. Heavy equipment should 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.
24. 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 should be properly designed, sized and installed.
25. Riparian vegetation (native trees and shrubs) shall be preserved to the maximum extent possible. Riparian
vegetation must be reestablished within the construction limits of the project by the end of the growing season
following completion of construction.
Thank you for requesting our input. The 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
�ril.norton(a�ncdenr. gov.