Construction of this combined sewer outfall was the critical first step in making way for the Ted Williams Tunnel.

Porter Street Outfall Project
Boston, Massachusetts

• Approximately 1 mile of cut and cover outfall construction.

• Large load bearing slurry wall foundations were replaced with precast post-tensioned culvert sections supported by
108 48” diameter caissons.

• Erected a 300 foot post-tensioned bridge.

• Poured approximately 800 linear feet of cement-bentonite cutoff wall.

• One of the first projects in the Boston area to utilize a cement-bentonite backfill to eliminate the problem of water migration.

• Relocated a taxiway blastwall.

• Relocated a heliport and new utilities.

• Provided alternate foundation system & final structure design value engineering which provided both time and cost savings for the Owner.