Request For Additional Information HE-0001 I-26 Interchange Future Exit 35 DWR#20230518

From: Mitchell,Robert K
To: Turchy.Michael A
Cc: Beckwith,Loretta A CIV USARMY CESAW USA);Coates,McCrav;Cheely,Erin K;Locklear,Susan P; McHenry,
David G
Subject: Request For Additional Information HE-0001 I-26 Interchange Future Exit 35 DWR#20230518
Date: Monday,May 1,2023 2:10:00 PM
Attachments: mage001.ong
HE-0001 CP 4C Merger Meetina Summarv.odf
Michael,
Feel free to give me a call if it would be easier to discuss some of these items on the phone.
On April 18, 2023, the Division of Water Resources (Division) received your application requesting a
401 Water Quality Certification from the Division for the subject project. The Division has
determined that your application is incomplete and cannot be processed. The application is on-hold
until the following information is received:
1. The stormwater drainage system from 1126+50—1131+50 WBL is currently being built for I-
4700 and should be shown in green. Please correct this on the plans and any other
stormwater drainage that is part of the 1-4700 project. [15A NCAC 02H .0502(c)]
2. Plans at CP 4c showed outlet protection on culverts at Site 5, 6, and 7. The submitted plans in
the application did not show outlet protection on the culverts at Site 5, 6, and 7. Please
explain why the protection was removed and demonstrate that the stream can handle the
increased velocity at the outlet. [15A NCAC 02H .0506]
3. Detail 5A stationing 24+50 RPC (Sheet 5) should read LT and not RT. Please correct on plans.
[15A NCAC 02H .0502(c)]
4. On the pre/post stormwater analysis table the applicant references a 55"RCP in the
interchange. Is that referring to the 66" RCP (Station 35+00 RPC) on the plans? Also,the
velocity table that was submitted in the 4C meeting minutes (table 1 page 5) is significantly
different from the pre/post numbers in the application table. For example Post 10-year
velocities for Stream SA below the proposed 36 inch RCP are 11.2 f/s; however, the table in
the application indicates that the velocity is 3.7 f/s post construction. Please clarify any
differences in these tables and indicate an approximate location on the table. Are the
velocities on the table in the application below the proposed outlets? I have attached the
meeting minutes from 4c for reference. [15A NCAC 02H .0502(c)]
5. On page 4 of 5 of the Stormwater Management Plan (SMP), under additional notes, please
reference the additional swales that did not meet the criteria, but were added into the
design. [15A NCAC 02H .0502(c)]
6. Please note on page 5 of 5 of the SMP whether the Pre Formed Scour Holes meet the design
criteria for the NCDOT BMP toolbox. [15A NCAC 02H .0502(c)]

7. Please include a narrative in the SMP that demonstrates that the applicant evaluated BMPs to
meet the NC SELDM Catalog recommendation. Documentation of the recommendations,
measures taken to meet the treatment goals, or restrictions to implementation were to be
included in the final SMP per CP 4A. [15A NCAC 02H .0506]
Pursuant to Title 15A NCAC 02H .0502(c), the applicant shall furnish all of the above requested
information for the proper consideration of the application. Please provide your response by June 1,
2023. If all of the requested information is not received,the Division will be unable to approve the
application and it will be denied as incomplete. The denial of this project will necessitate
reapplication to the Division for approval, including complete application and the appropriate fee.
Feel free to contact me if you have any questions.
Kevin Mitchell
Environmental Specialist II
Division of Water Resources
401 & Buffer Transportation Permitting
NC Department of Environmental Quality
828-296-4650 Office
828-231-1580 Mobile
Email Kevin.mitchell(@ncdenr.gov
NC DEQ Asheville Regional Office
2090 U.S. Hwy. 70
Swannanoa, N.C. 28778
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NORTH CAROLINA
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
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