Post Point Alternative Outfall - Bellingham, Wash.
Strider was awarded this contract by the city of Bellingham and completed all the upland excavating, trenching and pipe installation. With our extensive fleet of marine equipment and knowledge of marine construction General worked as a subcontractor to Strider Construction for the in-water outfall work.
The project began with the relocation of approximately 1,000 sq ft of eelgrass. Then a 250ft long by 50 ft wide trench was dug. Serving as a foundation for the diffuser, three, 4 ft by 12 ft articulated concrete ballast mats were placed at in 55 ft of water in Puget Sound. The 620 ft. long, 54 inch HDPE outfall pipe was sealed at each end and pulled from the beach into the water. While it was floating, 23 concrete weights were attached. Each weight was over 15,000 pounds. After attaching the onshore end to its tie-in point, we used controlled submergence to sink the pipe into the trench and onto the mats. Finally the trench was backfilled and the beach was restored to its previous appearance.