20200546 Ver 1_More Info Received_20200508

From: Beasley. Troy
To: Mitchell. Robert K; amanda.iones(ftsace.armv.mil
Subject: RE: [External] Kenilworth Drive - Asheville, Buncombe County - Additional Information (DWR #20200546 Ver 1)
(WR #08181125.00)
Date: Friday, May 8, 2020 1:18:23 PM
Attachments: imaae003.pnno
2 - Stream Impacts Rev.pdf
ECMDS Upstream Channel Stabilization.pdf
• rnal email. Do not click links.666Len attachment, ijnlpqq vnij verify. Send all suspicious
attachment to reoort.spamPnc.gov
Kevin,
The attached impact map has been revised to include a typical channel relocation section. As you
can see, the proposed channel will mimic the width, depth and slopes of the existing channel.
I have also attached the calculations for the upstream constructed channel. The slope is relatively
steep (-6%) which results in a 10-yr velocity of 8.75 ft/s and a shear stress of 2.93 Ibs/ft2. The
attached calculations indicate that Class '1' rip -rap is stable under these conditions, while
biodegradable blankets are not.
Let me know if you have any further questions.
Troy Beasley
ersRavenel
01
219 Station Road, Suite 101 1 Wilmington, NC 28405
Office:910.256.9277 1 Direct:910.509.6512
Mobile: [phone]
tbeasley(cDwithersravenel.com
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From: Mitchell, Robert K <[e-mail]>
Sent: Friday, May 8, 2020 9:39 AM
To: Beasley, Troy <[e-mail]>; [e-mail]
Subject: RE: [External] Kenilworth Drive - Asheville, Buncombe County - Additional Information (DWR
#20200546 Ver 1) (WR #08181125.00)
Troy,
Thanks for the response. In addition, can you please provide the channel dimensions for the

constructed channel upstream of the culvert as well as velocity and shear stress calculations that
provide justification for the use of rip rap above the proposed culvert.
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. If all of the requested information is not
received within 30 calendar days, of receipt of this email, the Division will be unable to approve the
application and it will be returned. The return of this project will necessitate reapplication to the
Division for approval, including a complete application package and the appropriate fee.
You may provide your response via email or mail to the address noted below.
Should you have any questions regarding these matters, please contact Kevin Mitchell at (828) 296-
4650 or kevin.mitchell(@ncdenr.gov.
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
—" "Nothing Compares ,
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Based on the current guidance to minimize the spread of COVID-19, the Department of
Environmental Quality has adjusted operations to protect the health and safety of the staff and
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check with the appropriate staff before visiting our offices, as we may be able to handle your
requests by phone or email. We appreciate your patience as we continue to serve the public during
this challenging time.

From: Beasley, Troy[mailto:[e-mail]]
Sent: Thursday, May 7, 2020 12:18 PM
To: Mitchell, Robert K <kevin.mitchell(cDncdenr.gov>; amanda.jones(@usace.army.mil
Subject: [External] Kenilworth Drive - Asheville, Buncombe County - Additional Information (DWR
#20200546 Ver 1) (WR #08181125.00)
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-aamtmr�(@nc.gov
Kevin/Amanda,
This email is in follow-up to my phone conversation with Kevin today. Kevin asked for some
clarification for the proposed stream impacts. Specifically, Kevin requested a breakdown of the
proposed impacts specifically for the culvert, rip -rap disspator and constructed channel, as well as
some information on the stabilization of the constructed channel. I had our engineers modify the
impact exhibit to show the additional breakout of the impacts as requested, which is attached.
The proposed impacts consist of:
• Impact 1-39 LF
0 1A (Culvert) — 8 LF
0 1B (Constructed Channel) — 31 LF
• Impact 3 — 52 LF
0 3A (Culvert) —11 LF
0 3B (Rip -Rap Dissipator) — 41 LF
In regards to stabilization of the constructed channel on the upstream end of the pipe, the design
changed slightly since we submitted the application, with the stabilization now being rip -rap. Based
on the velocity of flow coming into the culverts during a storm, stabilization of the constructed
channel with biodegradable matting was likely to fail. So the design has been changed to stabilize
the constructed channel with rip -rap. However, this does not affect the proposed stream impacts
totals.
As specified on the attached impact plan, the constructed channel will be graded to match the
existing natural channel geometry (width & depth). By constructing the new channel to mimic the
existing channel width, the base flow depth will be maintained. Additionally, the rip -rap will installed
the same as the dissipator, with the rip -rap being embedded in the banks and bed of the
constructed channel such that aquatic life movement will not be impeded.
Amanda — I just realized that I never received an email from an RPA noting that the project had been
logged and providing the AID #. Can you please confirm that you received our application?
Thanks for everyone's help.
Troy Beasley

219 Station Road, Suite 101 I Wilmington, N
Office:910.256.9277 1 Direct:910.509.6512
Mobile: [phone]
[e-mail]
4bokedin.comll I ffacebook.comll � ftwitter.comll I fvoutube.comll
linstagram.coml
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