20001432_US 421 slope failure_20160810 (2)

Carpenter,Kristi
From:Williams, Andrew E SAW <[e-mail]>
Sent:Wednesday, August 10, 2016 1:56 PM
To:Paugh, Leilani Y
Cc:Wrenn, Brian L; Moore, Byron G; King, Art C
Subject:RE: US 421 slope failiure
Leilani:

I think the plan is fine. Also, we will handle it as a compliance action:

1. The fill (rip rap in the channel) is in non-compliance with the approved plan.
2. Your plan will be accepted as restoration, in order to get into compliance with the permit conditions and the approved
plan.
3. Once you have the final plan, just submit it (via email) as your restoration plan along with a schedule for start and
completion of the restoration plan. The plan should include photos of the existing areas of impact (crossing locations).
4. Upon completion, please provide us a notification and photos of the restored site.

Please let me know if you have any questions. Thanks.

Andrew Williams
Regulatory Project Manager
US Army Corps of Engineers
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587

919-554-4884 ex. 26

-----Original Message-----
From: Paugh, Leilani Y \[mailto:[e-mail]\]
Sent: Monday, August 08, 2016 5:32 PM
To: Williams, Andrew E SAW <[e-mail]>
Cc: Wrenn, Brian L <[e-mail]>; Moore, Byron G <[e-mail]>
Subject: \[EXTERNAL\] US 421 slope failiure

HI Andy and Brian

Byron Moore and I reviewed the slope failure on US 421 in Sanford with Division personnel. After review of the site, we
recommended that the stream channel should be left in place. This is due to the unstable conditions of the channel both
upstream and downstream of the slope failure area. The existing root system is holding the channel in place. A channel
relocation would require removal of the trees and excavation of a new channel in poor soils. The right of way available is
very limited by the existing sewer line so we would have no control over the channel upstream of the area.

Division has worked with Geotech to design a buttressed slope protection to stabilize the slope after grading it to a 2:1
ratio. We recommended a boulder toe protection in the outside bend of the channel adjacent to the slope repair. This
would stabilize the channel in place while maintaining a natural bed and bank.

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For construction, Division would need a temporary stream impact at the repair area to build the buttressed slope
protection and install the boulder toe. Access would be along the sewer line crossing of the channel upstream of the
slope repair area and would also require a temporary stream crossing. We had discussed a NW 3 as the appropriate
permitting mechanism.

We should have final design drawings showing these recommendations but I wanted to get some feedback from you
about the concept and permitting.

Thanks

LeiLani Paugh

ICI/OSM Group Supervisor

919 707 6146

[e-mail] <mailto:[e-mail]>

NCDOT

Project Development & Environmental Analysis

1020 Birch Ridge Dr.

Raleigh, NC 27610

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

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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
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