20190695 Ver 1_Sampson Bridge 213 curing compound_20211013

From:Westphal, Anneliese
To:Sprinkle, Hannah H
Cc:Shaver, Brad E SAW ([e-mail]); Farrell, Sean C; Herndon, T. Mason
Subject:Sampson Bridge 213 curing compound
Date:Wednesday, October 13, 2021 5:29:42 PM
Attachments:image001.png
Sampson 213 photo 2.jpg
curing compound back.jpg
curing compound front.jpg
Sampson 213 photo 1.jpg
Hannah,
During our visit to Sampson Bridge 213 on SR 1710 Emmet Thornton Rd., we noticed a white film on
the water in the vicinity of the interior bent that is being constructed. We learned that it came from
a curing compound that is typically used on concrete and had just been sprayed on the interior bent
cap. Most of the film was located between the turbidity curtain and the existing end bent of the
bridge (see attached photo) but some was located outside of the turbidity curtain. The compound is
described as water-based, white-pigmented concrete curing compound which are wax-based
dispersions with selected white pigments (see attached photos of the container). We are not sure
why this was able to access the water, although there was some wind today.

We asked for the contractor to use absorbent pads to remove it from the surface of the water but
since they did not have any materials on site, we will need to follow-up with the assistant resident
engineer to see what they were able to do. We will need to take steps on any future application to
make sure that they are able to apply such products without it reaching the water.

Please let me know if you have any suggestions or insight.

Thank you,
Anneliese

Anneliese Westphal
Environmental Senior Specialist
Division 3
NCDOT- Division of Highways

910 341 2000 office
910 604 1330 mobile
910 675 0143 fax
[e-mail]

5501 Barbados Blvd
Castle Hayne, NC 28429-5647

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