19980260 Ver 4_ICA_20191009

North Carolina Department of Transportation
Roadside Environmental Unit
Erosion & Sedimentation / Stormwater Report
ICA / ECPAR
Immediate Corrective Action / Erosion Control Plan Audit Request
This project does not comply with the North Carolina Erosion and Sedimentation Control laws. Immediate Corrective Action is needed to resolve the situation to full
compliance with the Law: (T15A: 04B.0000). Deficiencies exist between the current phase of grading and the erosion control plan for this project. An erosion control plan
review involving project personnel, the erosion control plan designer, REU erosion control design staff and the REU Field Operation Engineer is requested to resolve the
situation.
Project Information
Inspection Date:
10/01/2019
Evaluator:
Phil Suggs
Project #:
34839.3.GV7
TIP #:
U-2579 D,E,F Contract #: C204088
Division #:
9
County:
Forsyth
Project Type:
Contract
Engineer:
Winston-Salem District (2)
Project Length:
7.00
Disturbed Acres:
100
River Basin:
Yadkin
HQW Zone:
NO Trout Zone: NO
Location
Winston Salem Northern Beltway University to
New Walkertown Rd, Forsyth co
Description:
Proiect Evaluation
Report Type: ❑Routine
❑✓ ICA
❑ICA Ex 1st
❑ICA Ex 2nd ❑CICA - SWO
❑ PCN
❑,/ ECPAR
Installation
Maintenance
Effectiveness Plan Overall Project
Length Section
of BMPs
of BMPs
of BMPs Implementation Evaluation
0.2 The Entire Project
6
6
6 6 6
Grading Scale: 0 - 6 = Immediate Corrective Action Required, 7 = Fair, 8 = Good, 9 = Very Good, 10 = Excellent
ICA / ECPAR Comments:
Drainage areas and hydro need to be reviewed for the Sites 5,6 and 8. Additional EC devices should be
added or upgraded as needed.
Remarks and Recommendations:
This Immediate Corrective Action report (ICA) is being issued due to large sediment losses into jurisdictional
streams.
Reviewed project with DOT personnel - Scott Wyrick, Thomas Smith and Zack McLaughlin, Josh Reeves,
Tyler Hasspacher;
Flatiron - David Flowers; Smith -Rowe - Patrick Lucas
-Recent heavy rains impacted project. Site conditions prior to rains were extremely dry and powdery.
Sediment loss noted at Sites 5, 6 and 8. Approx sta's 78, 130 and 135 left. Sediment is deposited in and
around the stream channel for long distances off site.
-Contractor needs to focus all work on erosion control repairs to prevent additional offsite impacts and and
clean up of off site sediment down stream of the project.
-The EC and Hydraulics design engineers need to review the drainage areas, contractors phasing of work and
drainage/ erosion control measures to help prevent future failures and off site impacts.
As work progresses, attention to managing site storm water drainage by limiting drainage areas and diverting
storm water into EC measures is critical.
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-Site 5: Heavy sedimentation in down -stream channel. At this site, berm failures contributed to the sediment
lost offsite thru the stream channel at the culvert outlet. Clean up main channel, lateral tributary, flood plains
and banks for approx 100 yds.
Culvert wing walls need to be completed, slopes built out and stabilized with rip rap around wing walls. Install
and maintain a compacted berm across the top of the culvert on both ends. Maintain the large berm as fill
height increases. Direct storm water runoff into skimmer basins once height is up - if it cannot be brought up
to sufficient elevation, the berm must be maintained and the areas stabilized with ground cover for the winter.
Maintain berms across upland areas to divert runoff into skimmer basins. Berms need to be sufficient height
and well compacted.
Temp seed all open erodible areas that are not at final grade and will not be brought to final grade within the
next 30-60 days.
-Site 6: Heavy sedimentation downstream in channel and on banks. Basin 10.3 C&G failed and skimmer was
broken. Replace this basin with 10.9 F per plans and add an additional tier behind it.
Clean up deposits over .5" depth in channel and accessible places on the banks down stream as far as the old
pipes installed in the stream channel. Try to minimize damage to stream banks. Clean out at culvert outlet,
build out slopes and add rip rap around wing walls, install silt fence behind rip rap and stabilize the slopes.
This needs to be done on both ends of the culvert. Maintain berm across top of slope and slope drains into the
skimmer basins.
Offsite properties impacted. Per the meeting yesterday, develop a plan of action for addressing the impacted
stream reach outside project limits, access to private property and repair/reclamation of any impacted drives
and fields. This should be done quickly so offsite impacts can be minimized.
-Site 8: Sediment loss was smaller - most trapped in checks at pipe outlet. Contractor cleaning out channel in
project limits - this is an impacted area under our 401/404 permits, but it is still a jurisdictional stream channel.
Rebuild and stabilize the channel in a continuous manner. Clean out pipes and drop inlets connected to the
system and repair all inlet protection.
Repair eroded ditches and install silt checks and inlet protection per plans. Stabilize the existing stream
channels upstream from the pipe inlet with rip rap per permit drawings. All erodible areas feeding this pipe
system need to be stabilized with rip rap or ground cover. Repair eroded/damaged slopes at pipe inlet and
outlet. Maintain diversions to direct storm water into skimmer basins. Maintain compacted berm across top of
fill on pipe outlet end.
Down stream, remove all accumulated sediment deposits larger than .5? deep from banks and channel for
approx 100 yds.
In general, culvert wing walls and all slopes around culvert inlets and outlets need to be finished and stabilized.
In addition, if the fill in the area of Site 5 cannot be raised to sufficient height to divert storm water to the EC
basins, the area will need to be winterized with ground cover - intermediate EC plan will be needed as well.
Overall Comments
-Rock checks in ditchlines throughout the project need to be repaired/installed properly with a weir to prevent
runoff from running around the rock check and eroding the ditch line. Please refer back to standard details
1633.01 and 1633.02.
-Maintain all erosion control measures throughout the entire project due to recent rainfall event.
All clean up efforts will be reviewed prior to any release of this project from the ICA status.
A final follow up inspection will be conducted by Tuesday, Oct 8 to assess clean up and EC repairs.
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