C204633 - U-2579AB - Winston Bypass Sediment Losses 1-09-24

Carpenter, Kristi
From: Sawicki (Gannett Fleming), Jeremy P
Sent: Thursday, January 11, 2024 4:18 PM
To: Euliss, Amy; Conchilla, Ryan
Cc: Shaver, Larry B; Trantham, Darren K; James Meachum; Hal Stultz; Jeremy Weatherman;
Smith, Thomas A; Allen Horton
Subject: C204633 - U-2579AB - Winston Bypass Sediment Losses 1-09-24
Attachments: Site 001.JPG; Site 006.JPG; 01 Pond_ -L- 686+00_RTjpg; 02 Pond_ -L- 686+00_RTjpg;
03 Pond_ -L- 686+00_RT.JPG; UXRPB 15+00 LT.JPG; Site 006 Post Mitigationjpg; 02
Site 007.JPG; 03 Site 007.JPG; 01 Site 007.JPG
Amy/ Ryan,
Please see the attached photos and below descriptions of the subject losses. Please let me know if you need any
additional information. Thanks
Date of loss: 01/09/2024
Location: Site 1 (Sta-Y4RPB-Rt 20+00)
Rain event: 2.21" (Website used for this project)
Estimated Loss: 20 buckets
Did the Loss Occur in the Stream/Wetland: Yes
Length Of Loss: 45'
Cause: Measures overwhelmed, Basin over topped
Corrective Action: Remove losses by hand or vacuum truck, Repair and perform maintenance on all measures, Install
Type 4 Fabric between basin and SDO
Timeline for Repair: 1 day, in process. Anticipated to be completed tomorrow morning 1-12-24
Before Photo: Attached "Site 001"
After Photo: Will be sent upon completion of the mitigation
Additional Comments: It is recognized that the outlet for the skimmer basin needs fabric placed from the weir to the
SDO. This was communicated prior to the loss, but did not get installed in time prior to the rain event
Date of loss: 01/09/2024
Location: Permit Site 7 Y15FLYBD 26+75 -Rt- (Y15FLYBD 26+75 -Rt-)
Rain event: 2.21" (Website used for this project)
Estimated Loss: 50-60 buckets. Difficult to assess as there is no clear location inside the measures that can be found (i.e.
sloughed or scoured area, rutted slope, etc.)
Did the Loss Occur in the Stream/Wetland: Yes
Length Of Loss: 150' (Combined value for both sections shown in photos)
Cause: Measures overwhelmed, Basin over topped
Corrective Action: All losses will be removed with vacuum truck, Repair and perform maintenance on all measures, a
rock dam will be installed per consultation with Thomas Smith at the head of the JS in an effort to mitigate the volume of
watershed being encountered in this area (This dam is currently in process)
Timeline for Repair: 3 days, Tentative on Vacuum truck availability and access to site. It is currently anticipated that this
work begin tomorrow morning 1-12-24
Before Photo: Attached "01 Site 007", "02 Site 007", "03 Site 007"
After Photo: Will be sent upon completion of the mitigation
Additional Comments: The RE Office will be pushing to install the permanent contract drainage in the area feeding Site 7
where it is believed we are experiencing issues retaining sediment so additional measures can be installed and the
surrounding area can be permanently stabilized. We have had issues with this site and made several modifications to the

surrounding measures in effort to stop these losses. We're hoping the rock dam will allow us to mitigate this long
enough to perform the permanent work necessary to eliminate any chances of future losses.
Date of loss: 01/09/2024
Location: UXRPB 15+00 -Lt- (Not designated as a Permit Site on this contract)
Rain event: 2.21" (Website used for this project)
Estimated Loss: 10 buckets
Did the Loss Occur in the Stream/Wetland: Yes
Length Of Loss: 10'
Cause: Measures overwhelmed
Corrective Action: Losses will be removed by hand and measures restored
Timeline for Repair: 1/2 day. Anticipated to be completed tomorrow 1-12-24
Before Photo: Attached "UXRPB 15+00 LT"
After Photo: Will be sent upon completion of the mitigation
Additional Comments: None
Date of loss: 01/09/2024
Location: Permit Site 006 (-L- 767+00 LT)
Rain event: 2.21" (Website used for this project)
Estimated Loss: 50 buckets/ Roughly 40 buckets could be recovered
Did the Loss Occur in the Stream/Wetland: Yes
Length Of Loss: 15'
Cause: Measures overwhelmed
Corrective Action: Losses will be removed by hand and measures restored
Timeline for Repair: Completed
Before Photo: Attached "Site 006"
After Photo: Attached "Site 006 Post Mitigation"
Additional Comments: None
Date of loss: 01/09/2024
Location: -L- 686+00 Rt (Pond adjacent to U-2579B project)
Rain event: 2.21" (Website used for this project)
Estimated Loss: 10 buckets
Did the Loss Occur in the Stream/Wetland: No
Length Of Loss: 15'
Cause: Preexisting slope drain from U-2579B project that was not removed upon completion of the project and
separated halfway up the existing slope. This separation caused the slope to slough into the rock line ditch that leads to
the pond. It can also be seen in the photos that the turbidity curtain was overwhelmed
Corrective Action: All material lost in the rock lined ditch will be recovered by hand. The turbidity curtain will be
repaired and installed in a manner to avoid the existing drainage coming from the adjacent project, which contributed to
the curtain being overwhelmed. The existing slope and slope drain will be repaired, as the drain can be used to assist
with the current operations taking place in this section of our project.
Timeline for Repair: 1 day. Turbidity curtain was repaired today. Slope and loss recovery from rock lined ditch to take
place tomorrow 1-12-24
Before Photo: Attached "01 Pond_ -L- 686+00_RT", "02 Pond_ -L- 686+00_RT", "03 Pond_ -L- 686+00_RT"
After Photo: Will be sent upon completion of the mitigation
Additional Comments: There was a measure (Type A check) installed at the end of the rock lined ditch that appear to
have retained a majority of the loss as well as a 100 LF buffer of vegetated land between the end of the ditch and the
pond. The photo showing the pond is misleading regarding the potential loss in the actual body of water. Upon direct

investigation today, it was found that what appeared to be a loss in the pond was discoloration from a skim coat of
settlement from turbid water that was retained before the turbidity curtain was overwhelmed. No measurable losses
in the pond were recognized .Access to this location from the project is very limited, and if losses are recognized at a
later date when the water is less turbid, the material will be reported and recovered via the TDE associated to the
project.
Jeremy Sawicki
Assistant Resident Engineer
Division 9, Lexington Construction Office
North Carolina Department of Transportation
336 249 6255 office
321 230 9732 mobile
ext-ipsawickia-ncdot.gov
452 Central Avenue
Lexington, NC 27292
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