Additional Information from NCWRC 20240208

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Winston, Joey
From:Leslie, Andrea J
Sent:Thursday, February 8, 2024 8:14 AM
To:Winston, Joey; Healy, Shannon CIV USARMY CESAW (USA)
Subject:FW: Setzer permit review questions
Attachments:Pre-Construction Notification (PCN) Form (15) - 12.21.23.pdf; 19.00124 - 401-404 -
GROGAN Impact Map 1.pdf; 19.00124 - 401-404 - Impact Maps.pdf; 19.00124 - 401-404
- Impact Maps-INDEX MAP.pdf; 19.00124 - 401-404 - DAVIDSON Impact Map 1.pdf;
19.00124 - 401-404 - DAVIDSON Impact Map 2.pdf; 19.00124 - 401-404 - DAVIDSON
Impact Map 3.pdf
This may be helpful to you.

Andrea

_____________________________________________
Andrea Leslie
Mountain Habitat Conservation Coordinator
NC Wildlife Resources Commission
645 Fish Hatchery Rd., Building B
Marion, NC 28752
828-803-6054 (office)
828-400-4223 (cell)
www.ncwildlife.org

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From: Kleinmaier, Brad <[e-mail]>
Sent: Wednesday, February 7, 2024 5:00 PM
To: Leslie, Andrea J <[e-mail]>; Cox, David R. <[e-mail]>
Cc: Deaton, David W. <[e-mail]>
Subject: Setzer permit review questions

Andrea,

Following our meeting this morning I got in touch with McGill with the following questions, and they provided the answers in
blue.

1) Is there a detail showing the pipe outlets into the stream? And do we need to report any temporary or permanent
impacts associated with those stream outlets? Both temporary and permanent impacts were reported. I am attaching
the impact maps that we submitted and the PCN which has a table on page 6 of the PDF.
a. I found the Reinforced Concrete Endwall detail on C-141, where is that utilized? All storm outlets, the
wetland outlet, and the overall water piping outlet? Do those all outlet at the streambed elevation, or will any
of those outlet further up the bank? We intend for the headwalls to sit at the edge of the water and at an
elevation that we utilize the flow in the stream to dissipate the flow from the pipe. This is described in
section 4, i of the PCN form (attached).
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b. What about the recirc pipe? The way that one is shown it almost looks like it just daylights, but we probably
need to do something to protect against erosion there. This will discharge out of the wall immediately below
the intake into the area of the stream that appears to be a minimum of 3’ deep, even at low flows. I was
planning to utilize a turned down elbow at this location.
2) I think we’ve talked about this before but want to make sure we’re thinking about it right. There is some concern
about the sediment filtration and making sure it is released before it builds up too much and we send a big batch of
sediment out all at once. Will the flushing of the vortex units be an automated system or will we have to have
someone go up there and tell it to flush manually? And I’m assuming if it’s automated that we could set it to run as
frequently, or with whatever amount of sediment (if it’s some sort of sensor system), as we want correct? The system
will be automated to turn on and discharge sediment based off of sediment level, a time cycle, or manually. I would
envision it primarily running off of sediment level with a minimum of a couple of cycles per day no matter what. I
think this setup will mimic the natural flow of sediment in the stream.
3) They wanted a little breakdown of where stormwater is going, are the below boundaries about right? And the
proposed wetland is designed to treat the increase in impervious area from the existing to the proposed correct? Your
drainage areas below are very close. Yes, we are treating for the increase in impervious area.

Additionally, here is the clip showing where the sediment filter will empty, and where the recirculation pipe will outlet.
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And this one shows the proposed concrete endwall that will be used.
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Let me know if that answers the questions we discussed, or if you need more information on any of them.

Thanks!
Brad
------------------------------------------------------------
Brad Kleinmaier, PE
Capital Projects Coordinator

NC Wildlife Resources Commission
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ncwildlife.org
Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.