20161268 Ver 2_U-4751 Site 10 Scour_20200429

Carpenter,Kristi
From:Shaver, Brad E CIV USARMY CESAW (USA) <[e-mail]>
Sent:Wednesday, April 29, 2020 3:57 PM
To:Herndon, T. Mason; Steenhuis, Joanne
Subject:\[External\] RE: U-4751 Site 10 Scour
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Mason,

The Corps has reviewed the requested field adjustment and agrees the work can be completed without a formal
modification. The work proposed is within the approximate limits of pre existing rip rap and is approved under this field
adjustment.

The Corps will file this exchange in the project file for future compliance.

Thank you for the detailed information and I appreciate your efforts in accomplishing this without making a site visit.

Brad

From: Herndon, T. Mason <[e-mail]>
Sent: Wednesday, April 29, 2020 3:11 PM
To: Steenhuis, Joanne <[e-mail]>; Shaver, Brad E CIV USARMY CESAW (USA)
<[e-mail]>
Subject: \[Non-DoD Source\] U-4751 Site 10 Scour

Yesterday I received a phone call from Jimmy Zepeda on U-4751, regarding a head cutting issue in the ditches on either
side of the outlet channel of the 2@9x7 RCBC at Site 10. These two features are as identified as “JS” on PD 21 of 83,
however we have discussed at previous field inspections that these features are truly “JS non-mit” but were never re-
evaluated like many of the channels were in the Greenview Ranches area. Joanne and I met with Jimmy onsite to
evaluate the situation. The contractor had recently regraded the banks of these channels and removed the existing rip
rap and pipes that were pre-existing in these channels. We observed head cutting in the channels which is shown in the
pictures above label “Head Cut DS LT” and “Head Cut DS RT”. It appears that the pre-existing pipes and rip rap were
necessary to maintain the stability of these two steep sections of outfall channel and removing them has created the
instability.

The Division would like to place rip rap back into these two channels, in close proximity to where it was preexisting to
stabilize these outfalls that discharge into the downstream stormwater pond for the adjacent development. The length
of rip rap required to stabilize these areas will be approximately 22 ft. in each channel and the location is circled in red
below:
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A photo of the preexisting downstream left ditch with the pipe and rip rap is attached and labeled “preexisting” for your
review. Please note that the re-installation of rip rap will still leave more open and natural channel than was pre-
existing because the pipes have been removed and please also note the remnants of rip rap that are still visible along
the banks in the photo labeled “Head Cut DS RT”.

Please let me know if the re-install of rip rap for stability can be covered under a field adjustment or requires additional
authorization.

Thank you!

Mason Herndon
Environmental Program Supervisor
Division 3
NCDOT- Division of Highways

910-341-2036 office
910-604-0050 mobile
[e-mail]

5501 Barbados Blvd
Castle Hayne, NC 28429

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North Carolina Public Records Law and may be disclosed to third parties

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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