20190200 Ver 1_17BP.5.R.72 Warren 9 FINAL ENVIRONMENTAL PROJECT COMMITMENTS_20190213

Warren Bridge 9 over Overflow for Shocco Creek on NC 58 (17BP.S.R.72)
FINAL Avoidance and Minimization Measures
The following "Design Standards in Sensitive Watersheds "[I SA NCAC 04B.0124 (b) —(e)J are
incorporated into NCDOT projects that occur within or upstream of water bodies that contain
federally protected aquatic species. Within the Environmentally Sensitive Areas, the following
shall apply:
-The contractor may perform clearing operations but not grubbing operation until immediately
prior to beginning grading operations.
-Once grading operations begin in the ESA, work shall progress in a continuous manner until
complete.
-Erosion control devices shall be installed immediately following the clearing operation.
-Seeding mulching shall be performed on the areas disturbed by construction immediately
following final grade establishment.
-Seeding mulching shall be done in stages on cut and fill slopes that are greater than 20 feet in
height measure along the slope or greater than two acres in area, whichever is less.
The following are additional measures intended to further reduce deleterious construction
related effects to the waterway:
A new roadway and culvert will be constructed on new location to the west. Traffic will be
maintained on the existing roadway and bridge until completion of the new structure. The
existing roadbed and bridge will be removed by the contractor and properly stabilized and later
reforested following standard reforestation detail (RF-1).
Best Management Practices for bridge Demolition and Removal will be implemented during the
removal of the existing bridge.
The bridge will be removed from the top down, first removing the asphalt with containment
measures in place to prevent components of the bridge deck from dropping into the stream. The
method of containment will be proposed by the contractor and approved by the engineer. This
will be followed by removal of the decking, girders, etc. The contractor will then isolate the
concrete abutments using an impervious dike. The contractor will then completely remove the
abutments.
A new three-barrel culvert (3 @ 12 ft x 8 ft) will be constructed at the site. Inlet and outlet
culvert improvements will be installed to direct flow into the downstream wetland system.
All sedimentation and erosion control measures, throughout the project limits, will be
cleaned out as appropriate to ensure proper function of the measures.