19980260 Ver 6_RE_ U-2579DEF lime spill_email_20210701

Wanucha, Dave
From:Euliss, Amy
Sent:Thursday, July 1, 2021 1:50 PM
To:Wanucha, Dave
Cc:Kiser, Marcus K; Suggs, Phillip H; McLaughlin, Zachery R; Wyrick, Scott D; Tucker,
Mezak; David Flowers
Subject:RE: U-2579DEF lime spill_email
NCDOT, FBDJV (Flatiron Blythe Joint Venture-prime contractor), and Site-Prep (subcontractor performing the
stabilization) met on site today to discuss the incident and measures to prevent it from happening again. I have
attached an email chain from FBJV that summarizes the preventative measures and a list of cleanup measures taken
thus far. It also includes the pH readings taken yesterday and today. We had a downstream pH spike from 6.8
(upstream) to 7.8 (downstream of the loss) yesterday afternoon. This morning readings were taken again and its 6.8
upstream and 7.0 downstream. The stream has been observed downstream of the project and no dead fish have been
observed. They’ll repeat the pH readings once clean up is complete, and we’ll share them with you moving forward.

As far as the cause of the loss, its my understanding that the subcontractor had an inexperienced operator who did not
properly rinse and drain the slurry tank. The subcontractor told us that this is the first time that they have ever had this
issue with their process. Typically they rinse the inside of the tank and place the rinse water onto the subgrade in the
area where they are working, or in an area that won’t drain off of the subgrade. In this instance, the driver did not
contain the slurry into the work area. Instead he drove at a slow speed with an open hose. The subgrade in this area is
supered such that it drains to boxes and slope drains. Those should have been closed off prior to application.

Please note that we have taken all necessary preventative measures moving forward, and regret the incident. If you
need any additional information or think of any additional measures, please advise. Also, I plan to revisit once cleanup
is complete, which will most likely be tomorrow. If you would like to review with me, let me know. Thanks.

Amy

From: Euliss, Amy
Sent: Wednesday, June 30, 2021 4:15 PM
To: Wanucha, Dave <[e-mail]>
Cc: Kiser, Marcus K <[e-mail]>; Suggs, Phillip H <[e-mail]>; McLaughlin, Zachery R
<[e-mail]>; Wyrick, Scott D <[e-mail]>; Tucker, Mezak <[e-mail]>
Subject: U-2579DEF lime spill

Good afternoon, Dave. We are currently doing chemical stabilization of the grade on the U-2579DEF project. Our
inspectors discovered a lime slurry spill this afternoon on the grade. We are currently trying to determine what
happened. The lime solution went down the slope and into a basin. There is evidence of slurry in the stream. I have
attached some pictures showing the lime slurry on the grade, in the basin, a film shown in the stream, and clean up
measures underway. DOT has directed Flatiron to cleanup the slurry from the grade, basin, etc. We have instructed
them to obtain pH samples upstream, and downstream at 100’ intervals to determine if the lime had an impact on the
pH of the waters. We have also directed them to install a series of wattles in the stream to the limits of the staining,
and collect any accumulated solids/slurry from the behind the wattles and anywhere along the stream that it has
deposited. We’ll keep you up to date when we receive additional information. Note this is permit site 6 (basin 10.5) on
the project. Let me know if you would like us to do anything additional. Thanks in advance.

Amy Euliss
Division 9 PDEA Engineer
1

North Carolina Department of Transportation

336 747 7802 office
[e-mail]

375 Silas Creek Parkway
Winston Salem, NC 27127-7167

Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.
2