20160587 Ver 1_More Info Letter_20160701 (2)

Strickland, Bev
From: Price, Zan (George)
Sent: Friday, July 01, 2016 4:19 PM
To: 'Van Wirt, Douglas P.'
Cc: Leslie, Andrea J; Elliott, William A SAW
Subject: Request for Additional Information - The Cove December Flood Repairs - Buncombe
County - DWR 16-0587
Attachments: TheCoveDecemberFloodRepairs_PorterCoveBr_Buncombe_WRCComments.pdf
The Division of Water Resources (DWR) has performed a review of a 401 Water Quality Certification application dated
May 22, 2016 and received by DWR on June 9, 2016 for the above referenced project. The DWR has determined that
your application is incomplete and cannot be processed. The application is on -hold until the following information is
received:
1. Impact S1: Provide the proposed longitudinal slope and a proposed typical cross-section with dimensions
including channel cross-sectional area, bottom width, top width, streambank slopes, and channel
depth. Provide justification for the proposed channel dimensions based on reference reach information or
stable dimensions upstream and downstream of the impact area. Size the channel appropriately to prevent
future channel aggradation or degradation. [15A NCAC 02H .0506 (b)]
2. Impact S2: The proposed plan includes the removal of an existing rock dam. Please provide a descriptive
narrative on the proposed construction techniques and construction sequence to prevent the release of
accumulated bed sediments to the downstream channel during the dam removal and stream channel
construction. Include construction details to stabilize the channel bed and provide grade control to prevent
unstable headcuts in the proposed channel. [15A NCAC 02H .0506 (b)]
3. Impact S2: Provide the existing and proposed longitudinal profile and channel cross-section
dimensions. Provide justification for the proposed channel dimensions based on reference reach information or
stable dimensions upstream and downstream of the impact area. Update the impact table on the PCN
application if the channel stabilization impact area increases upstream to achieve a stable channel slope. [15A
NCAC 02H .0506 (b)]
4. Impact S3: Provide the existing and proposed channel cross-section dimensions. Provide justification for the
proposed channel dimensions based on reference reach information or stable dimensions upstream and
downstream of the impact area. [15A NCAC 02H .0506 (b)]
5. Impact S5: Per condition 8 of Water Quality Certification 3883, placement of culverts and other structures in
waters and streams must be 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 or equal
to 48 inches, to allow low flow passage of water and aquatic life. Provide justification if the proposed culvert
installations do not meet this condition. WQC 3883: http://ncdenr.s3.amazonaws.com/s3fs-
public/Water%20Quality/Surface%2OWater%20Protection/401/Certs%20and%2OPermits/2012%2OGeneral%20
Certifications/GC3883. pdf
6. Reference the NC Wildlife Resource Commission letter dated June 17, 2016 for additional recommendations
(see attached).
Pursuant to Title 15A NCAC 02H .0502, the applicant shall furnish all of the above requested information for the proper
consideration of the application. If all of the requested information is not received within 45 calendar days of receipt of
this email, the DWR will be unable to approve the application and it will be returned. The return of this project will
necessitate reapplication to the DWR for approval, including a complete application package and the appropriate fee.
Contact me if you have any questions or concerns.

Regards,
Zan Price, P.E.
Assistant Regional Supervisor — Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
828 296 4662 office
828 231 9634 mobile
zan.price(a)ncdenr.gov
2090 U.S. Hwy. 70
Swannanoa, N.C. 28711
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