20201287 Ver 1_More Info Received_20220830

Staff Review Form
NORTH CAROLINA
Envlronm¢ntcl Qvofiry
Updated September 4, 2020
Staff Review
Does this application have all the attachments needed to accept it into the review process?*
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ID# *
20201287
Version* 1
Is this project a public transportation project?*
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• No
Reviewer List: * Doug Perez:eads\djperez
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Mooresville Regional Office - [phone]
Does this project require a request for payment to be sent?*
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Project Submittal Form
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mandatory questions are answered.
Project Type: *
For the Record Only (Courtesy Copy)
New Project
Modification/New Project with Existing ID
More Information Response
Other Agency Comments
Pre -Application Submittal
Re-Issuance\Renewal Request
Stream or Buffer Appeal
Pre -Filing Meeting Date Request was submitted on:
7/7/2021
Project Contact Information
Name:
Jennifer Burdette
Who is submitting the information?
Email Address: [e-mail]
Project Information
Project Name: Liberty Park Phase 2 Stream Stabilization
Is this a public transportation project?
Yes
No
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
Yes No Unknown
County (ies)
Iredell
Please upload all files that need to be submited.
Click the upload button or drag and drop files here to attach document
Liberty Park Add Info 2022-08-30.pdf 7.71 MB
Only pdf or kmz files are accepted.
Describe the attachments or
comments:
Please see the attached email for a description of the field changes and their necessity for the design of the
stream stabilization. These changes do not involve any additional impact.
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By checking the box and signing box below, I certify that:
• I, the project proponent, hereby certifies that all information contained herein is true, accurate, and complete to the
best of my knowledge and belief.

• I, the project proponent, hereby requests that the certifying authority review and take action on this CWA 401
certification request within the applicable reasonable period of time.
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Statutes (the "Uniform Electronic Transactions Act");
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Signature:
Submittal Date: Is filled in automatically.

Jennifer Burdette
From: Richard Wright <[e-mail]>
Sent: Friday, August 26, 2022 3:22 PM
To: Jennifer Burdette
Cc: Rebecca Stubbs; Nick Lowe
Subject: RE: Liberty Park - SD400 Field Changes
Attachments: 20220825_111239.jpg; 20220825_111917.jpg
I forgot to include pictures of the denuded stream for visual reference. They are attached.
MCADAMS
Richard Wright El
designer II, water resources
direct 980.729.6089 mobile [phone]
[e-mail]
3430 Toringdon Way, Suite 110, Charlotte, NC 28277
www.mcadamsco.com
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From: Richard Wright
Sent: Friday, August 26, 2022 3:19 PM
To: Jennifer Burdette <[e-mail]>
Cc: Rebecca Stubbs <[e-mail]>; Nick Lowe <[e-mail]>
Subject: Liberty Park - SD400 Field Changes
Jennifer —
I have recommended field changes to be made to the design of SD-400 outfall at Liberty Park - this is the steep
stormwater outfall near the swimming pool on the south-eastern side of the property. The original design (attached)
proposed the use of a series of steep boulder sills to set and maintain grade within the reconstructed channel from the
existing stormwater outfall to UT1 downstream. After the contractor had cleared the existing vegetation within the work
area around SD-400 and I was, for the first time, able to see the existing channel and stormwater outfall clearly, I was
immediately worried about the future vertical and lateral stability of the reconstructed channel if the design proceeded
as proposed. Below is a brief discussion of the field changes to the design.
The six proposed boulder sill have been re -configured to create a series of three boulder cascades upstream of the
proposed angled log riffle. No additional material will be necessary for construction of the proposed field changes. The
proposed boulder cascades will have greater structural stability as the are to be constructed at a more gradual slope and
can be constructed in such a way that water is directed towards the center of the channel and away from the
constructed side slopes. The proposed field modifications will also allow for construction of longer scour pools at the
base of each cascade for energy dissipation. Another driver behind the field changes was the discovery of an existing
bedrock seam at the downstream end of the existing channel. The exposed bedrock is located approximately 1.5' below
the existing grade shown on the surveyed stream profile and would have made construction of proposed boulder sills 5
and 6 nearly impossible. The revised profile (see the revised plan sheet SS1.09 attached) shows the tail of the angled log
riffle tying into the head of the exposed bedrock seam. The bedrock extends to the bed elevation of UT1 downstream,
so there is no worry of vertical instability of the channel downstream of the bedrock.
If you have any questions or comments please reach out. Thanks.
1

ai
MCADAMS
Richard Wright El
designer II, water resources
direct 980.729.6089 mobile [phone]
[e-mail]
3430 Toringdon Way, Suite 110, Charlotte, NC 28277
www.mcadamsco.com
Join Our Team
0 0 0
2