19980260 Ver 6_RE_ U-2579DEF lime spill_DWR_20210701

Wanucha, Dave
From:Euliss, Amy
Sent:Thursday, July 1, 2021 3:16 PM
To:Wanucha, Dave
Subject:RE: U-2579DEF lime spill_DWR
Will do. Thanks!

From: Wanucha, Dave <[e-mail]>
Sent: Thursday, July 1, 2021 3:11 PM
To: Euliss, Amy <[e-mail]>
Subject: Re: U-2579DEF lime spill

Thanks for the update. I do not need too review the cleanup tomorrow. It sounds as though you all have it in hand and
cannot think of anything further. I understand mishaps happen. It’s important that everyone stays on top of it until all
lime Is cleaned up out of the channel as much as practicable and that preventive measures are in place and all staff and
contractors are aware of proper clean out procedures. Send me a follow-up email once your final inspection is
complete.

Dave W.
Dave Wanucha
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 27105

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

On Jul 1, 2021, at 1:50 PM, Euliss, Amy <[e-mail]> wrote:

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
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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
North Carolina Department of Transportation

336 747 7802 office
[e-mail]

375 Silas Creek Parkway
Winston Salem, NC 27127-7167

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