20140762 Ver 4_request to swap PSH with a dissaptor pad_20200312

Wanucha, Dave
From:Hining, Kevin J
Sent:Tuesday, March 10, 2020 12:09 PM
To:Wanucha, Dave; [e-mail]
Subject:request to swap PSH with a dissaptor pad
Attachments:Station 165 photo.jpg; R-2915 B modification to PSH at station 165.pdf
Hey Dave and Lori,

I have a modification I would like to seek your approval on, regarding a proposed pre-formed scour hole (PSH) at the
outlet of a stormwater pipe on R-2915 B, at Station 165 (Ashe County). Dave visited the site with us last month. I’ve
attached a photo above, and the plan sheet as well, for reference.

The contractor has yet to install the PSH, and currently the pipe outlet is over sand. Despite this, it has only caused a
small depression in the ground, suggesting the pipe carries very little stormwater. Since the surrounding area is
vegetated, we were hoping to replace the proposed PSH with just a dissipator pad. We could do the latter by placing
rock from above the pipe, without having to disturb much of the surrounding vegetation.

Both our roadside environmental engineer and hydraulics staff in Raleigh were fine with the modification. In their view,
the proposed PSH was not necessary given the minimal amount of stormwater the pipe carries. So, I’m writing to see
what you might need from me in order to swap out the PSH at this location with a dissipator pad.

Also, you will noticed the pipe needs to be shortened. We plan to remove the excess length of pipe, and not sure why
that wasn’t done in the first place.

If this email is all that is needed to make the modification, then great, but just let me know if you need more
information. Or, if this level of documentation is overkill, then let me know that as well:)

Thanks,

Kevin

Kevin Hining
Division 11 Environmental Officer
North Carolina Department of Transportation

336 903 9129 office
828-386-7202 cell
[e-mail]

801 Statesville Rd.
PO Box 250
North Wilkesboro, NC 28659

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Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.
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