20191338 Ver 1_Proposed trenching method_20190806

Carpenter,Kristi
From:Shaver, Brad E CIV USARMY CESAW (USA) <[e-mail]>
Sent:Tuesday, August 06, 2019 1:10 PM
To:James, Amy; Steenhuis, Joanne; Lane, Stephen
Cc:Herndon, T. Mason; Rivenbark, Chris
Subject:\[External\] RE: Isabelle Holmes bridge--proposed trenching method
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Amy,

I don't have a preference provided the material is contained. I have had some correspondence with NOAA but it has
been slow. I suspect this could put you back in line for a response.

Brad

-----Original Message-----
From: James, Amy \[mailto:[e-mail]\]
Sent: Friday, August 2, 2019 9:47 AM
To: Shaver, Brad E CIV USARMY CESAW (USA) <[e-mail]>; Steenhuis, Joanne
<[e-mail]>; Lane, Stephen <[e-mail]>
Cc: Herndon, T. Mason <[e-mail]>; Rivenbark, Chris <[e-mail]>
Subject: \[Non-DoD Source\] Isabelle Holmes bridge--proposed trenching method

Brad, Joanne, and Stephen,

As you may recall, the Isabelle Holmes drawbridge conveys US 74/NC 133 over the Northeast Cape Fear River; as part of
a preservation project, an underwater cable that works the drawbridge mechanism is being replaced (FYI, permit
applications have not yet been submitted for this work). The original proposed trenching method used a crane with a
clamshell bucket mounted on a barge, with removed material disposed of off-site. However, Division would like to
explore using a hydraulic suction pump instead (see attached info); divers would use a handheld vacuum device
powered by a hydraulic pump (mounted on a barge) to remove sediment, which would be captured in geotextile
dewatering bags and disposed of off-site. DOT proposed the clamshell method in their original coordination with NMFS
for Atlantic sturgeon (since this is critical habitat) and before we present this proposed change to NMFS, we wanted to
make sure the pump method would be acceptable to you all.

Please let me know if you have any questions.

Thanks,

Amy

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Amy James

Environmental Analysis Unit

Natural Environment Section

919-707-6129

[e-mail]

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