20231199 Ver 1_More Info Requested_20231010

Baker, Caroline D
From: Homewood, Sue
Sent: Tuesday, October 10, 2023 3:18 PM
To: Perry Isner
Cc: Stygar, KRYSTYNKA B CIV USARMY CESAW (USA); [e-mail]
Subject: RE: Request for Additional Information for Greenbriar Ridge SD - Iredell County -
DWR#20231199 - Corrected Project Number
Please forgive me, I listed an incorrect project number in the subject for this email. The correct DWR project number is
20231199
Thanks,
Sue Homewood (she/her/hers)
401 & Buffer Permitting Branch
Division of Water Resources
[e-mail] please note my new email address
336 813 1863 mobile
919-707-3679 office
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Homewood, Sue
Sent: Tuesday, October 10, 2023 3:14 PM
To: Perry Isner <[e-mail]>
Cc: Stygar, KRYSTYNKA B CIV USARMY CESAW (USA) <[e-mail]>; [e-mail]
Subject: Request for Additional Information for Greenbriar Ridge SD - Iredell County - DWR#20230828
Hello Perry,
I have been assigned the review the above noted project. I have a few items that require some additional information in
order for me to complete the review and issue a 401. Please respond to this email within 30 days. Please note that the
application will be considered on hold until receipt of a complete response.
1. Please confirm that a riprap dissipator will not be required by the local government or appropriate S&EC review
entity or revise the project impacts and plan sheets accordingly. It is the Division's experience that energy
dissipation is required by these agencies.
2. The project proposes utility impacts that are offsite. The offsite impacts do not appear to be within the limits
that were verified by the USACE. Please clarify whether the USACE has provided verification or confirmation of
the offsite features.
3. Please provide plan sheets that show that the stream channel will not be widened above and below the storm
culvert in accordance with standard 401 requirement: Culverts shall be designed and installed in such a manner
that the original stream profiles are not altered and allow for aquatic life movement during low flows. The
dimension, pattern, and profile of the stream above and below a pipe or culvert shall not be modified by
widening the stream channel or by reducing the depth of the stream in connection with the construction
activity. The width, height, and gradient of a proposed culvert shall be such as to pass the average historical low
flow and spring flow without adversely altering flow velocity. If the width of the culvert is wider than the stream
channel, the culvert shall include multiple boxes/pipes, baffles, benches and/or sills to maintain the natural width

of the stream channel. If multiple culverts/pipes/barrels are used, low flows shall be accommodated in one
culvert/pipe and additional culverts/pipes shall be installed such that they receive only flows above bankfull.
4. Please note that all work must be done "in the dry'. Therefore, dewatering methods will be necessary to
temporarily dewater the stream channel during culvert installation and during utility line installation. Please
provide a construction sequence and dewatering details that show that dewatering is to be utilized at the site
and the sequence of construction events to be followed to ensure compliance with this condition. In addition,
please ensure that the location of the temporary impacts are shown on the construction drawings and clearly
indicated in the revised impact table.
5. Please provide a stream restoration detail for the utility line installation stream impact locations and a wetland
restoration detail for utility line installation wetland impact locations.
6. Pursuant to 15A NCAC 02H.0506(b) "a 401 Water Quality Certification may only be issued upon determining that
the proposed activity will comply with state water quality standards which includes designated uses, numeric
criteria, narrative criteria and the state's antidegradation policy, as defined in rules of 15A NCAC 02B .0200... In
assessing whether the proposed activity will comply with water quality standards, the Division shall evaluate if
the proposed activity: (2) would cause or contribute to a violation of water quality standards; (3) would result in
secondary or cumulative impacts that cause or contribute to, or will cause or contribute to, a violation of water
quality standards;" Based on the current proposed plan the Division believes there is potential for indirect
impacts to Tributary 4 as all surface flow to this channel appears to be routed to two SCMs which would
discharge at the lower end of the project boundary. Please either, include indirect impacts to Tributary 4 within
the impact table and provide mitigation for this section, provide hydrologic calculations to document that
surface flow will continue to support the existing function of Tributary 4, or provide a monitoring plan that will
document existing conditions of Tributary 4 and post construction conditions.
7. Sheet 8 of 12 appears to show a proposed greenway crossing over Tributary 1. Please clarify if there will be
additional impacts as a result of the greenway at this location.
8. Sheet 10 of 12 shows a proposed water line location within the limits of the Top of Bank of Tributary
7. Standard 401 certification conditions require that: Any utility construction corridor that is parallel to a
stream or open water shall not be closer than 10 feet to the top of bank or ordinary high-water mark.
Thanks,
Sue Homewood (she/her/hers)
401 & Buffer Permitting Branch
Division of Water Resources
[e-mail] please note my new email address
336 813 1863 mobile
919-707-3679 office
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.