[External] RE_ C204553 78_ RCP As-built

From:Steffens, Thomas A CIV USARMY CESAW (USA)
To:Farrell, Sean C; Sprinkle, Hannah H; Lane, Stephen
Cc:Westphal, Anneliese
Subject:[External] RE: C204553 78" RCP As-built
Date:Wednesday, January 11, 2023 5:42:58 PM
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Sean,

The Corps agrees to monitor the accretion of sediment at in the 72”RCP (2304).
No corrective action on this structure needs to be taken at this time, but future
conditions may warrant mitigative measures to ensure permit compliance.

Be advised that future culvert/pipe installations (in JS or relocated JS streams
where the 1ft burial provision applies) should be reviewed for proper
elevations on finished construction. This includes any constructed conveyances
draining into and out of the structure. Any recovery operations needed for
sediment losses should also be closely monitored to prevent over/under
excavation issues that require corrective action.

Please note there is a permit Special Condition that specifically refers to
culverts and the need to ensure aquatic life passage at low water. As such,
failure to bury, pre-load or grade conveyances appropriately to a structure
where this permit condition applies may lead to remedial actions including, but
not limited to, non-compliance and or enforcement actions.

Thomas A Steffens
Regulatory Project Manager
US Army Corps of Engineers
2407 West 5th Street
Washington, NC 27889
(910)-251-4615

We at the U.S. Army Corps of Engineers Regulatory Branch are committed to
improving service to our customers. We would appreciate your feedback on
how we are performing our duties. Our automated Customer Service Survey is
located at: https://regulatory.ops.usace.army.mil/customer-service-survey/

From: Farrell, Sean C <[e-mail]>
Sent: Wednesday, January 11, 2023 8:32 AM
To: Steffens, Thomas A CIV USARMY CESAW (USA) <[e-mail]>; Sprinkle,
Hannah H <[e-mail]>; Lane, Stephen <[e-mail]>
Cc: Westphal, Anneliese <[e-mail]>
Subject: [URL Verdict: Neutral][Non-DoD Source] FW: C204553 78" RCP As-built

Tom, Hannah, and Stephen

Please see the below email from Ben and the as-built elevations of the 72” RCP. It appears the pipe
inverts where set at the correct elevations, but the ditch was slightly over excavated (possibly a
result of loss retrieval efforts). Mason and I have discussed this and we would like to avoid the
contractor having to go in and regrade the ditch at this stage. We think the pipe is buried enough on
the inlet and being that it is about at grade on the outlet, it should continue to accrete sediment
over time. We would like to continue to monitor this instead of taking immediate corrective action if
you are in agreeance. Please let me know your thoughts on this.

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: Tuesday, January 10, 2023 1:51 PM
To: Farrell, Sean C <[e-mail]>
Cc: Westphal, Anneliese <[e-mail]>; Gingrich, Sophia E <[e-mail]>;
Waugh, Daniel G <[e-mail]>; Jackson Provost, PE, PLS
<[e-mail]>; Brandon Helms <[e-mail]>
Subject: C204553 78" RCP As-built

Sean,
Attached and below are the as-builts for the inverts of the ditch and 78” pipe at the US17 area. The
inverts and outlet have been over excavated during the retrieval of the sediment from the storm
event that occurred 12/22/2022 -12/23/2022. Concerns if we add material:
Inlet side will creating a head cut with most of the material washing into the pipe until an
equilibrium is met.
Outlet side adding material will impound water inside of the pipe.
There was not a note or provision to place material inside of the pipe to help equalize the
system

The typical Safe Passage Requirements for Culvert Placement permit provision was not included in
the C204553 Permits. To date the Conti has been submitting their drainage investigations for review,
which are meeting the Safe Passage Requirements for Culvert Placement.

Please advise if corrective action or monitoring of the area is required. Let us know if there is any
additional information needed.

Point Name Northing Easting Elevation Point Code
1 238759.614 2399860.25 34.814 Invert Out Pipe
2 239166.444 2400004.239 36.047 Invert In Pipe
3 238750.7 2399856.938 34.867 out - 10'
4 238740.679 2399854.203 34.803 out - 20'
5 238729.534 2399851.255 34.584 out - 30'
6 239175.397 2400010.492 36.212 inlet - 10'
7 239184.057 2400016.344 36.43 inlet - 20'
8 239192.39 2400022.265 36.604 inlet - 30'

Cheers,
Ben

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

From: Hunter Livingstone <[e-mail]>
Sent: Monday, January 9, 2023 6:57 AM
To: Meyer, Benjamin C <[e-mail]>
Cc: Bryce Locke <[e-mail]>; Brandon Ulishney <[e-mail]>; James Day
<[e-mail]>; John Kristensen <[e-mail]>; Michael Sullivan
<[e-mail]>; Zachary Fuller <[e-mail]>; Brandon Helms
<[e-mail]>; Jackson Provost, PE, PLS <[e-mail]>
Subject: RE: [External] 78" RCP As-built

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Ben,

Please see attached information along with table below. Let me know if you have any questions.

Point Name Northing Easting Elevation Point Code
1 238759.614 2399860.25 34.814 Invert Out Pipe
2 239166.444 2400004.239 36.047 Invert In Pipe
3 238750.7 2399856.938 34.867 out - 10'
4 238740.679 2399854.203 34.803 out - 20'
5 238729.534 2399851.255 34.584 out - 30'
6 239175.397 2400010.492 36.212 inlet - 10'
7 239184.057 2400016.344 36.43 inlet - 20'
8 239192.39 2400022.265 36.604 inlet - 30'

Hunter Livingstone | Project Engineer
18087 U.S. 17
Hampstead, NC 28443
o. 910.524.2234 | m. 910.524.2234
[e-mail]

Done Once, Done Right

ContiCivil.com | Facebook | LinkedIn
a member of The Conti Group

From: Meyer, Benjamin C <[e-mail]>
Sent: Friday, January 6, 2023 9:01 AM
To: Hunter Livingstone <[e-mail]>
Cc: Bryce Locke <[e-mail]>; Brandon Ulishney <[e-mail]>; James Day
<[e-mail]>; John Kristensen <[e-mail]>; Michael Sullivan
<[e-mail]>; Zachary Fuller <[e-mail]>; Brandon Helms
<[e-mail]>; Jackson Provost, PE, PLS <[e-mail]>
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Subject: RE: [External] 78" RCP As-built

Hunter,
That provides us the information for the 78” pipe invert is correct per the accepted drainage
investigation. As noted in the plans and drainage investigation the pipe is supposed to be buried 1’
as part of the environmental requirement. We also need the grades shot at least every 10’ for
approximately 30’ from the invert and outlet. During the retrieval of the sediment after the rain
event on 12/22-12/23 the area may have been over excavated. Currently, it appears that the ditches
on either side of the pipe were graded to match the invert of the pipe. Please provide us with the
additional information for the ditch grades. Let us know if you have any questions.
Cheers,
Ben

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

From: Hunter Livingstone <[e-mail]>
Sent: Friday, January 6, 2023 8:38 AM
To: Meyer, Benjamin C <[e-mail]>
Cc: Bryce Locke <[e-mail]>; Brandon Ulishney <[e-mail]>; James Day
<[e-mail]>; John Kristensen <[e-mail]>; Michael Sullivan
<[e-mail]>; Zachary Fuller <[e-mail]>; Brandon Helms
<[e-mail]>
Subject: [External] 78" RCP As-built

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attachment to Report Spam.

Ben,

Please see attached CSV file from as-built on 78” RCP pipe run 2304.

Point Name Northing Easting Elevation Point Code
1 238759.6 2399860 34.814 Invert Out
2 239166.4 2400004 36.047 Invert In

Any questions please let me know.

Hunter Livingstone | Project Engineer
18087 U.S. 17
Hampstead, NC 28443
o. 910.524.2234 | m. 910.524.2234
[e-mail]

Done Once, Done Right

ContiCivil.com | Facebook | LinkedIn
a member of The Conti Group

Email correspondence to and from this sender is subject to the N.C. 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.