RE_ C204553 (R-3300B) Pit D Turbid Discharge (2)

From:Gingrich, Sophia E
To:Lane, Stephen; Sprinkle, Hannah H; Steffens, Thomas A CIV USARMY CESAW (USA)
Cc:Westphal, Anneliese; Farrell, Sean C
Subject:RE: C204553 (R-3300B) Pit D Turbid Discharge
Date:Wednesday, March 1, 2023 3:48:57 PM
Attachments:CamScanner 03-01-2023 10.09.jpg
image001.png
Tom, Hannah, and Stephen,

Attached is the turbidity reading I received from Brandon today. It is down to 157 NTUs. His plan is
to get a reading Mon/Wed/Fri until it is cleared up. If you would like a report more frequently,
please let me know. We’ll add this to our list for tomorrow.

Thanks,

Sophia Gingrich
Environmental Specialist I
Division 3
NCDOT – Division of Highways

From: Lane, Stephen <[e-mail]>
Sent: Wednesday, March 1, 2023 3:42 PM
To: Gingrich, Sophia E <[e-mail]>; Sprinkle, Hannah H <[e-mail]>;
Steffens, Thomas A CIV USARMY CESAW (USA) <[e-mail]>
Cc: Westphal, Anneliese <[e-mail]>; Farrell, Sean C <[e-mail]>
Subject: RE: C204553 (R-3300B) Pit D Turbid Discharge

Thank you for the update and photos. Let’s go ahead and plan on visiting this site tomorrow during
our scheduled visit to the project.

From: Gingrich, Sophia E <[e-mail]>
Sent: Monday, February 27, 2023 4:08 PM
To: Sprinkle, Hannah H <[e-mail]>; Lane, Stephen <[e-mail]>;
Steffens, Thomas A CIV USARMY CESAW (USA) <[e-mail]>
Cc: Westphal, Anneliese <[e-mail]>; Farrell, Sean C <[e-mail]>
Subject: RE: C204553 (R-3300B) Pit D Turbid Discharge

Tom, Hannah, and Stephen,

I wanted to update you on the turbid release from the basin at Pit D3 last week. I visited the site on
Friday 2/24/23. Like Ben said in his original email, they are dealing with a situation similar to what
happened at Pit G, where the particles of the material are so fine that they remain in suspension for
a long time. They have stopped the discharge from the basin to the RPW. They are still pumping
from Pit D3 into the basin even though the skimmer has been plugged. They plan to spray the turbid
water in the basin out over the fill to get rid of it. They have coir fiber matting with PAM over where
the water from the pit is entering the basin and plan on getting floc logs and liquid flocculant to put
in the basin in an effort to reduce the turbidity. Brandon will be getting daily turbidity readings until
this is cleared up. It may take a while, since there is very little to no flow in the RPW. I attached a
document that includes the readings through today.

Let me know if you have any questions at this time. I will continue to update you on the turbidity
readings and we can plan on seeing this site during the ride through on Thursday.

Thanks,

Sophia Gingrich
Environmental Specialist I
Division 3
NCDOT – Division of Highways

From: Sprinkle, Hannah H <[e-mail]>
Sent: Friday, February 24, 2023 10:47 AM
To: Lane, Stephen <[e-mail]>; Farrell, Sean C <[e-mail]>; Steffens,
Thomas A CIV USARMY CESAW (USA) <[e-mail]>
Cc: Gingrich, Sophia E <[e-mail]>; Westphal, Anneliese <[e-mail]>
Subject: RE: C204553 (R-3300B) Pit D Turbid Discharge

Sean,

Thanks for passing this report along, I’ll add this information to the project folder and plan to see
the site in person next week.

Hannah
From: Lane, Stephen <[e-mail]>
Sent: Thursday, February 23, 2023 9:07 AM
To: Farrell, Sean C <[e-mail]>; Steffens, Thomas A CIV USARMY CESAW (USA)
<[e-mail]>; Sprinkle, Hannah H <[e-mail]>
Cc: Gingrich, Sophia E <[e-mail]>; Westphal, Anneliese <[e-mail]>
Subject: RE: C204553 (R-3300B) Pit D Turbid Discharge

Hi Sean,

Thanks for passing this along. Please keep us updated with your findings after the
site visit and let us know of any measures they can/will implement to try to avoid this
in the future. Thanks,Stephen

From: Farrell, Sean C <[e-mail]>
Sent: Wednesday, February 22, 2023 4:16 PM
To: Steffens, Thomas A CIV USARMY CESAW (USA) <[e-mail]>; Sprinkle,
Hannah H <[e-mail]>; Lane, Stephen <[e-mail]>
Cc: Gingrich, Sophia E <[e-mail]>; Westphal, Anneliese <[e-mail]>
Subject: FW: C204553 (R-3300B) Pit D Turbid Discharge

Tom, Hannah, and Stephen,

See below report from Ben Meyer. Conit had a turbid release into an RPW from the outlet of their
sediment basin out by the D-pits. One of us will get out there to look at this issue and report back
with more details.

Thanks,

Sean Farrell
GIS Analyst
Division 3
NCDOT- Division of Highways

910-341-2033 office
910-599-1184 mobile
[e-mail]

5501 Barbados Blvd
Castle Hayne, NC 28429

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

From: Meyer (RK & K Civil Engineering), Benjamin C <[e-mail]>
Sent: Wednesday, February 22, 2023 4:10 PM
To: Farrell, Sean C <[e-mail]>
Cc: Gingrich, Sophia E <[e-mail]>; Westphal, Anneliese <[e-mail]>; Jim L.
Haga <[e-mail]>; Jackson Provost, PE, PLS <[e-mail]>; Brandon
Helms <[e-mail]>; Waugh, Daniel G <[e-mail]>
Subject: C204553 (R-3300B) Pit D Turbid Discharge

Sean,
As we discussed this morning, there was a turbid discharge from the riser pipe from the Pit-D
sediment basin that went into the relatively-permanent-water. This occurred due to the dewatering
of the adjacent pit. We are dealing with similar material as were found in G-Pit, which remain in
suspension for a really long time due to fineness of the sediment particles. Currently, the riser has
been plugged and additional water is not entering the RWP. Conti is looking into alternative methods
to attempt to settle out the particles. Please let us know if you have any additional questions.
Cheers,
Ben

Ben Meyer, PE, CCM
Assistant Resident Engineer
Hampstead Bypass
Cell: 910-617-1902
[e-mail]
[e-mail]

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