Richmond Bridge #91 revised armoring impacts_

Carpenter, Kristi
From: King, Art C
Sent: Thursday, August 24, 2023 9:34 AM
To: Conchilla, Ryan; Carpenter,Kristi
Cc: Welch, Tim; Brumagin, Stephen A (Steve) CIV USARMY CESAW (USA)
Subject: Richmond Bridge #91 revised armoring impacts.
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Rya n,
Yesterday I went back out to look at Richmond Bridge # 91 to refresh my memory. It had been a considerable amount of
time since the original site visits. That's when I discovered that the armoring as shown on the construction plans was
substantially already in place, particularly along the right side of the channel. What I think may have happened was,
when the consulting engineering firm drew up the plans, they may have assumed that we would need to remove the
existing concrete footers and armoring and replace it with new material. However, after a discussion with the Division
bridge Engineer we have determined that the existing armoring and footers will stay in place but, will be supplemented
with additional riprap along the edges and above the plane of ordinary high water, up to the new bridge end bents.
Along both sides of the channel there are existing concrete footers imbedded in the bank. And, on the upstream along
the left side there is a natural outcropping of rock that would make the placement of riprap virtually unnecessary. The
concrete footers on both sides of the channel will stay in place (see photos)
Our conclusion is, there will be considerably less than 60ft of new impacts in the channel for armoring. We would expect
to have less than half that amount, if even that much.
We can provide a revised impact table and plan drawing to reflect this if you need them.
Please let us know if you have any questions or need more information.
Thanks,
Art C. King
Division Environmental Supervisor
NCDOT Highway Division 8
910 773 8015 office
910 690-6581 cell
acking ncdot.gov
121 Dot Drive
Carthage, NC 28327

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