20131279 Ver 1_AS Built Survey_20170616

Strickland, Bev
From: Willson, Kenneth <[e-mail]>
Sent: Friday, June 16, 2017 9:11 AM
To: Huggett, Doug; [e-mail]; Trowell, Steve; Howell, Jonathan;
Bodnar, Gregg; Dunn, Maria T.; Ken Riley ([e-mail]); Scarbraugh, Anthony
Cc: Rosov, Brad; [e-mail]
Subject: Hatteras Inlet Connector Channel
Attachments: RC_05_HST_20170601.pdf
OR
Based on the attached AS -BUILT survey, the maintenance dredging of the Connector Channel, conducted by the
Sidecaster Merritt in late May, was able to establish controlling depths of -7 to -9 ft. MLW. This is a welcomed
improvement from the pre -construction conditions and has opened up the channel to navigation once again. I thank
you all for your assistance working through some of the timing issues with the MOA and USACE dredge plant schedule.
As you may be aware, the Sidecast Dredge Merritt is scheduled to go in for substantial maintenance work starting
October V. The expectation is that the dredge will be out of service for approximately 6 months. During those six (6)
months, communities will have to rely on the special use hopper dredges Murden and Currituck to maintain shallow
draft channels. Whereas the sidecaster can get into very shallow and heavily shoaled areas, the special use hoppers
typically need 5 to 6 feet of water to operate. That means that if a channel shoals to a depth that is shallower than the
special use hopper's operational depth, the channel may remain shoaled in until the sidecast dredge is back in
service. This is a big cause of concern for a number of communities.
In speaking to the USACE about scheduling, they believe that it would be advisable to try to conduct one more sidecast
dredge event of the channel prior to the Merritt going offline to ensure that the special use hopper dredges have
enough water to maintain the channel in the Merritt's absence. Their schedule for September is booked up for
maintenance work at New River for which they have had to coordinate closely with DoD at Camp Lejeune to allow for
specific training exercises. They have advised CPE -NC and the County that if they were going to be able to do one last
maintenance event with the sidecaster, that event should occur in late August. As you know, the dredge window for this
permit doesn't open back up until Oct. 1"
At present, the plan is to monitor depths in the channel and the position of the channel over the coming 4 to 6 weeks
and make a determination as to the necessity of another sidecaster event in late August. The County is also planning to
authorize a marine archeologist to conduct a submerged cultural resource survey of the areas around the recently
dredged channel so that when the next maintenance event occurs the USACE can follow deep water, which will
considerably decrease the time required to establish navigable depths through the channel.
At this time, my intent is only to provide you information on the anticipated path forward in the spirit of close
coordination. We will continue to provide you all updates and are available to answer questions.
Kind Regards,
Mr
Ken Willson
Client Program Manager 1
Coastal & Maritime Services
Environmental & Sustainability
Tel: + 1 910 791 9494
Cell: + 1 910 443 4471

Fax: + 1 910 791 4129
Kenneth.willson(cDCBI.com
CB&I
4038 Masonboro Loop Road
Wilmington, NC 28409
USA
www.CBI.com
rOSs
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