20210345 Ver 1_Hemphill email_20210419

Wanucha, Dave
From: Hemphill,Jeffrey L
Sent: Monday, April 19, 2021 10:00 AM
To: Wanucha, Dave
Cc: Alsmeyer, Eric C CIV USARMY CESAW (US) ([e-mail])
Subject: RE: B-4626 deck preservation treatment_DOT
Dave, Eric
Hear is the response from NCDOT's Structures Unit:
I talked with Gannett Fleming this morning to confirm that the planned overlay on bridge 790008 will be a Polymer
Concrete (PC) overlay.
(In the past we have done only Polyester Polymer Concrete (PPC), but we are expanding this type of overlay
material to allow Epoxy Polymer Concrete (EPC) overlays. Surface preparation and placement of the two polymer
concrete materials are essentially the same.)
For Polymer Concrete overlays, the deck is prepared by removing a minimum 3/4" depth of the existing concrete
deck by scarification.After scarification, the deck is checked to determine if areas of unsound concrete or patching
that require additional removal remain in the deck. Afterward, any areas requiring deeper removal are repaired with
the polymer concrete material,up to the elevation of the scarification.The deck area is then cleaned by shotblasting
to further remove small deleterious material and to clean the concrete deck surface. As required by our Special
Provisions and Specifications, all material removed by scarification and shotblasting is collected and removed from
the bridge and disposed of properly. The area is primed with high molecular weight methacrylate (HMWM) for
PPC overlays or epoxy resin for EPC overlays. After a short waiting period (approximately 15-30 minutes), the PC
overlay in placed. After the overlay has sufficiently hardened other operations—such as grooving of the surface,
and installation of the joints and seals - are performed. During the course of all of this work, as required by our
Special Provisions and Specifications, all bridge deck expansion joints, deck drains, and other sections in the
immediate work area of the bridge affected by the work being performed are sealed prior to beginning scarification
or demolition. The expansion joints and other items remain sealed until it has been determined that water and
materials from the scarification, shotblasting, and PC placement operations cannot be discharged through them any
longer. The Contractor required is to take all steps necessary to eliminate the flow of water or materials through
the expansion joints, and any other locations water or materials could leak from the deck
Let me if this will suffice
Jeff Hemphill
Senior Environmental Specialist
Environmental Analysis Unit
North Carolina Department of Transportation
919 707 6126 office
[e-mail]
1598 Mail Service Center
Raleigh, NC 27699-1598
1020 Birch Ridge Drive
Raleigh, NC 27610
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From: Wanucha, Dave<[e-mail]>
Sent: Monday, April 5, 2021 3:28 PM
To: Hemphill,Jeffrey L<[e-mail]>
Cc:Alsmeyer, Eric C CIV USARMY CESAW (US) ([e-mail]) <[e-mail]>
Subject: B-4626 deck preservation treatment
Hey Jeff,
Please provide additional information regarding proposed Bridge 8 deck preservation treatment. For example,
a paragraph would suffice that describes the process, materials used and how DOT's contractors conduct the
operation including minimization efforts in relation to any discharges to the Yadkin River/Tuckertown
Reservoir. We need to review the requested information, prior to issuance of the 401 Certification. Thanks.
Dave W.
Division of Water Resources
401 & Buffer Transportation Permitting
NC Department of Environmental Quality
336-776-9703 office
336-403-5655 mobile
[e-mail]
NC DEQ Winston Salem Regional Office
450 West Hanes Mill Road,Suite 300
Winston Salem, NC 27106
Based on the current guidance to minimize the spread of COVID-19,the Department of Environmental Quality has
adjusted operations to protect the health and safety of the staff and public. Many employees are working remotely or
are on staggered shifts.To accommodate these staffing changes, all DEQ office locations are limiting public access to
appointments only. Please check with the appropriate staff before visiting our offices, as we may be able to handle your
requests by phone or email. We appreciate your patience as we continue to serve the public during this challenging
time.
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