HomeMy WebLinkAboutNOI 10.22.2025PROJECT NARRATIVE
GREAT ISLAND RD. CAUSEWAY BRIDGE
OCTOBER 22, 2025
The area subject to this Notfce of Intent is a bridge locatfon that crosses over a tfdal creek
associated with Uncle Roberts Cove in West Yarmouth. Please see the locus maps for the
exact locatfon.
Although the proposed actfvity is intended to be restricted to the road and bridge abutments
independently with no coastal wetland resource impacts on the ground, a resultfng Order of
Conditfons from an NOI provides further surety for establishing a firm framework for the work
actfvity to be carried out in a compliant manner.
The bridge is many decades in service and has been evaluated with the conclusion that it is
sound for the current use loading. To forestall further degradatfon several tasks are
recommended for securing the inner voids of the abutments using pressure groutfng. To
better distribute wheel loads on the drive surface steel plates are proposed for broader load
distributfon on the bridge deck approaches. Piling shims for the two existfng pilings are
proposed on contfngency.
Groutfng - The groutfng is based on examinatfon of the void spaces in 4 general locatfons on
four points of the abutments. The 4 locatfons are estfmated for grout as follows:
SE abut. – 4.5 c.y.
NE abut. – 5.5. c.y.
SW abut. – 2 cu. ft.
NW abut. - 1 c.y.
The pressure process delivers material on a slow output through a narrow nozzle, hand
carried. Observatfonal control adequately governs the process preventfng unchecked release
of the grout. The actfvity can be managed as the jet is hoisted around on the roadway and
the stone / concrete abutment. No work actfvity will occur outward from the road b ed
formatfon. Removal of several sectfons of the post and rail fence is proposed to facilitate ease
of access. The grout material is a low strength Portland cement / sand aggregate mixture with
higher water content for injectfon flow. No adverse environmental impacts would occur from
small quantftfes of grout release but no uncollected releases will occur.
Steel Plates – The steel plates must be installed beneath the existfng bituminous pavement.
The existfng pavement shall be saw-cut and pulled up with direct placement into a waitfng
truck for transport off site. The volume of pavement to be removed is estfmated at 3 to 4 c.y.
max. for each plate. The two uniform, rectangular saw-cut zones shall have pavement
replaced and roll compacted once the steel plates are in place and firmly bedded. Routfne
paving has occurred on Great Island Rd. in the recent past and this process is similar in all
respects. The pavement removal shall be controlled with observatfons and inspectfon to
collect any material that could be bumped aside. It will be a straightiorward task to view the
limited work area to insure a clean site.
The 2 bridge piling shims are to be evaluated prior to the choice to replace and pounded into
positfon using hand work.
The bridge work locatfon as approx. 5 ft. above the plane of high tfde. The road abutment
being stone and concrete does not lend itself to a common type of silt fence. There is no
excavatfon of soil or soil fill proposed. A series of flagged stakes can be set in place along the
bottom edge of the road bed as a symbolic guard actfng as a work limit. The observatfonal
control of materials is a suitable practfce to ensure the work and related actfvity is confined.
With controls in place and the work carried out as outlined, there will be no adverse impact
to the nearby coastal wetland resources.