20221676 Ver 1_More Info Requested_20230214

Homewood, Sue
From:Homewood, Sue
Sent:Tuesday, February 14, 2023 8:59 PM
To:Saine, Gary; McMillan, Ian
Cc:Dailey, Samantha J CIV USARMY CESAW (US)
Subject:Request for Additional Information for Niblick Dr Culvert Replacement - Gaston
County - DWR#20221676
Gary, thank you for attending to the fee payment so quickly after my last email.

Ian/Gary:

I have reviewed the above noted project and require additional information to complete the review. Please provide a
response to the below items within 30 days. Please note that the application will be considered “on hold” until a
complete response is received.

1. The stream is reported as approx.. 3 feet wide and the culvert widths as 12’ in total width. Culverts should be
designed and installed in such a manner that the original stream patterns and 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.

If you are unable to modify the culvert design to use multiple culverts to accommodate stormflows then please
redesign the culvert to include structures such as baffles that will provide for normal baseflow widths at low
flow conditions.

2. The riprap dissipator at the outlet of the culvert appears to be designed to be much wider than the stream
channel. As noted above, it is required that you provide a design that maintains the normal dimension, pattern
and profile of the stream through this section. Please provide plans that clearly detail how a normal stream
channel pattern will be maintained through the rirprap apron.

Thanks,

Sue Homewood (she/her/hers)
401 & Buffer Permitting Branch
Division of Water Resources
[e-mail]
336 813 1863 mobile
919-707-3679 office *new*

1

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: Wednesday, February 1, 2023 8:38 AM
To: Saine, Gary
Subject: Niblick Dr Culvert Replacement

Hello Gary,

I’m helping out our Mooresville office with some 401 application reviews. It appears that the fee for this application has
not been submitted and therefore we cannot start our review. Please see the attached email regarding fee payment.

Thanks,

Sue Homewood (she/her/hers)
401 & Buffer Permitting Branch
Division of Water Resources
[e-mail]
336 813 1863

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

2