RE_ _External_ Question about modification for DWR-20230633 Woodfield Apts

Baker, Caroline D
From:
Pitner, Andrew
Sent:
Friday, August 23, 2024 3:14 PM
To:
Daniel Kuefler
Cc:
Homewood, Sue
Subject:
RE: [External] Question about modification for DWR-20230633 Woodfield Apts
Hi Daniel,
Thanks for the update on the project. We'll let this email serve as the modification and I'll add it to the Laserfiche
file for the project. Thanks for keeping us in the loop.
Andrew
Andrew H. Pitner, P.G.
Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
Division of Water Resources
Department of Environmental Quality
704 235 2180 direct office
704 663 1699 MRO main line
704 235 2101 fax
DWR website: http://www.ncwater.org
610 East Center Avenue, Suite 301, Mooresville, NC 28115
E '2�
NORTH CAROLINA
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Daniel Kuefler <[e-mail]>
Sent: Friday, August 23, 2024 2:47 PM
To: Pitner, Andrew <[e-mail]>
Cc: Homewood, Sue <[e-mail]>
Subject: [External] Question about modification for DWR-20230633 Woodfield Apts
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Andrew and Sue,

hope you both are doing well. I'm reaching out because we have been helping with a project for which
401 /404 permits were issued recently, but (after they were issued) a 3rd-party reviewer on behalf of the
City of Huntersville identified that additional velocity -reducing measures were needed to meet local
requirements for the permitted road crossing.
Subsequent discussions were had with USACE during which several options were explored to achieve
the required velocity -reduction in a way that was the least impactful to the stream. Options such as
stepping down the stream, altering the grade, and the use of Gabion Baskets within the stream channel
were all eliminated as they either did not meet the required reductions or were more impactful to the
stream channel and/or aquatic habitat.
Ultimately, it was determined that a small plunge pool below the culverted crossing and a small
expanded overflow bench would satisfy the velocity requirement while maintaining baseflow,
maintaining the existing stream width and grade, and minimizing the amount of impacts to the stream.
The Corps has issued a modification to the existing 404 based on these updated plans, which
require very minor additional permanent stream impacts (+/- 4 LF). I am writing to ask whether this
modification requires an updated 401 and/or is an acceptable modification with this email serving as a
courtesy notice.
Please let me knowyour thoughts and/or let me know if I can provide additional information.
Thanks very much,
Daniel
Attached for reference include:
-a copy of the original401 approval
-a copy of the modified 404 approval
-updated plans depicting the plunge pool configuration
-a depiction of how WEPG proposes to help oversee the construction of a natural overflow bench. This
bench would serve to catch overflow waters during high-water events and reduce velocities by allowing
the water to dissipate over an expanded vegetated bench
Daniel Kuefler, PWS
Wetlands & Environmental Planning Group
Leonard S. Rindner, PLLC
www.wetLands-epg.com
336.554.2728