RE_ R-3300B Hampstead Bypass -Turbid Release (2)

From:Farrell, Sean C
To:Sprinkle, Hannah H; Lane, Stephen; Shaver, Brad E CIV USARMY CESAW (US); Steffens, Thomas A CIV USARMY
CESAW (USA)
Cc:Bullard, Jason M; Yarborough, Jerry W; Westphal, Anneliese; Gingrich, Sophia E
Subject:RE: R-3300B Hampstead Bypass -Turbid Release
Date:Friday, November 18, 2022 3:18:52 PM
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Hannah, Tom, Brad, Stephen,

Wanted to follow back up on this after my site visit yesterday afternoon. The water looked clear and
back to normal in the JS. The basin has been removed and the contractor is moving extremely
quickly on getting the 72” RCP installed in that area. I spoke with Jim Haga and he said that they
were thinking the pipe would act as a barrier to the large recently filled area of the -L- line up
gradient. I asked that he talk with Conti’s erosion control folks and our Roadside Env. Field Ops to
determine if any additional measures are warranted to capture and treat any concentrated runoff
that may come from the -L- line (the EC plans do not call for any additional basins). Right now things
look clear.

Hope you all have a great weekend,

Sean Farrell
Division Environmental Officer
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: Sprinkle, Hannah H <[e-mail]>
Sent: Thursday, November 17, 2022 2:41 PM
To: Farrell, Sean C <[e-mail]>
Subject: RE: R-3300B Hampstead Bypass -Turbid Release

Sean,

Thanks for the update. Glad to see the numbers are already trending downward.

Hannah

From: Farrell, Sean C <[e-mail]>
Sent: Thursday, November 17, 2022 10:58 AM
To: Sprinkle, Hannah H <[e-mail]>; Steffens, Thomas A CIV USARMY CESAW
(USA) <[e-mail]>; Shaver, Brad E CIV USARMY CESAW (US)
<[e-mail]>; Lane, Stephen <[e-mail]>
Cc: Bullard, Jason M <[e-mail]>; Yarborough, Jerry W <[e-mail]>;
Westphal, Anneliese <[e-mail]>; Gingrich, Sophia E <[e-mail]>
Subject: RE: R-3300B Hampstead Bypass -Turbid Release

Hannah,

Turbidity reading this morning was down to 20.9 NTUs. I am going to head out there this afternoon
to get my eyes on it.

Thanks,

Sean Farrell
Division Environmental Officer
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: Sprinkle, Hannah H <[e-mail]>
Sent: Wednesday, November 16, 2022 2:42 PM
To: Farrell, Sean C <[e-mail]>; Steffens, Thomas A CIV USARMY CESAW (USA)
<[e-mail]>; Shaver, Brad E CIV USARMY CESAW (US)
<[e-mail]>; Lane, Stephen <[e-mail]>
Cc: Bullard, Jason M <[e-mail]>; Yarborough, Jerry W <[e-mail]>;
Westphal, Anneliese <[e-mail]>; Gingrich, Sophia E <[e-mail]>
Subject: RE: R-3300B Hampstead Bypass -Turbid Release

Sean,

Thanks for the report. I agree some additional measures (wattles and flocculant treatment) will
hopefully help settle the suspended particles. If you wouldn’t mind providing an updated turbidity
reading in the next couple of days.

Thanks,

Hannah

From: Farrell, Sean C <[e-mail]>
Sent: Wednesday, November 16, 2022 1:41 PM
To: Sprinkle, Hannah H <[e-mail]>; Steffens, Thomas A CIV USARMY CESAW
(USA) <[e-mail]>; Shaver, Brad E CIV USARMY CESAW (US)
<[e-mail]>; Lane, Stephen <[e-mail]>
Cc: Bullard, Jason M <[e-mail]>; Yarborough, Jerry W <[e-mail]>;
Westphal, Anneliese <[e-mail]>; Gingrich, Sophia E <[e-mail]>
Subject: R-3300B Hampstead Bypass -Turbid Release

Hannah, Tom, Brad, and Stephen,

I am reporting some turbidity in the same JS that leaves the R-3300B project across US-17 from
Andrew’s Mortuary. The borrow pit discharge is clear right now as the contractor has gotten down
to the sandy layers. The culprit is a skimmer basin around L1 Northern STA 850+90. The inlet of the
basin was overwhelmed by yesterday’s rain event, even though the rain was reported less than an
inch. Currently we have turbid discharge in the JS downstream of the skimmer basin which had a
reading of 171.6 NTUs. The contractor is going repair the inlet of the skimmer basin and clean out
built up sediment. We also discussed installing some wattles with flocculant in the flow patterns
leading to the inlet pipe. We are looking at other ways to treat the surface runoff with flocculant
prior the basin entrance. The runoff is coming from the recently placed material from the borrow pit
that is composed of extremely fine organic particles, so chemical treatment with flocculant is really
the only way to settle out these suspended particles. The pipe will be installed in this section of the
JS in the coming week or two and the fill material will soon be capped with more sandy material that
is currently being excavating from borrow pit ‘G’. We will keep you updated with the repairs to the
basin and turbidity readings until this clears up. Please feel free to reply with any questions or
recommendations.

Thanks,

Sean Farrell
Division Environmental Officer
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.

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