20190200 Ver 1_17BP.5.R.87 Franklin 66 FINAL ENVIRONMENTAL PROJECT COMMITMENTS_20190213

Franklin Bridge 66 over Shocco Creek on NC 58 (17BP.S.R.87)
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 bridge 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 engineer will monitor the situation to
determine if the abutments can be completely removed or cut flush with the streambed/mudline
(preference is complete removal). Constructed streambanks in the footprint of the abutments
will be stabilized with Class II rip rap.
The contractor will install turbidity curtains in Shocco Creek during removal of the historic
timber piles. An attempt will be made to completely remove the existing timber piles;
however, if this cannot be accomplished with minimal substrate disturbance, the piles will be
pinched off one foot below the mud line or cut flush with existing mud line as directed by the
engineer. The contractor will not be allowed to drag removed timber piles on or across the
streambed.
The contractor will install an impervious dike in the stream at the new bridge structure to allow

for installation of Class II rip rap bank stabilization on the north streambank.
No equipment or components will be placed/staged in Shocco Creek unless noted in these
commitments.
A new two-span bridge will be constructed at the site that completely spans Shocco Creek.
Deck drains will not be allowed to discharge directly into the stream.
Special sediment control fence NCDOT Standard No. 1606.01 or a combination of special
sediment control fence and standard silt fence will be installed between the top of the stream
bank and bridge embankment. Once the disturbed areas of the project draining to these areas
have been stabilized, the special sediment control fence and/or standard silt fence and all built
up sediment adjacent to these devices will be removed to natural ground and stabilized with
appropriate seed mix. Native grass mix will be used on the floodplain.
All sedimentation and erosion control measures, throughout the project limits, will be
cleaned out as appropriate to ensure proper function of the measures.
Coir fiber matting will be installed on the footprint of unclassified structure excavation near the
streambanks.
Embankment construction and grading shall be managed in such a manner as to prevent surface
runoff/drainage from discharging untreated into the riparian buffer. Instead all interim surfaces
will be graded to drain to temporary erosion control devices. Temporary berms, ditches, etc. will
be incorporated, as necessary, to treat temporary runoff before discharging into the riparian
buffer (as specified in the NCDOT BMP Manual).
The contractor will provide at least three weeks notification to the Resident Engineer and
Division Environmental Officer concerning start of work at the bridge to allow the Department
to contact the North Carolina Wildlife Resource Commission (NCWRC). NCWRC staff may
move aquatic species out of the work area prior to construction activity.