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HomeMy WebLinkAboutC204633 - U-2579AB - Winston Bypass Sediment Losses 1-09-24Carpenter, 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 Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.