Pleasure Bay Tunnel Crossing Replacement
To protect the marine ecology of Pleasure Bay and Shrewsbury River in Monmouth County, NJ, Hazen was selected to design and perform construction management
services for the 50-year old Pleasure Bay Interceptor (PBI), which conveys sewage flow beneath Pleasure Bay, and the 50-year old Main Pump Station, which pumps sewage from PBI to the TRWRA Wastewater Treatment Plant (WWTP).
Project Outcomes and Benefits
- Hazen team assisted Two Rivers Water Reclamation Authority (TRWRA) in securing $75 million in funding for this project.
- New 50-mgd state-of-the-art MPS will have a 105-foot deep combination dry pit/wet pit layout, designed to minimize pump station cycling and surges into the WWTP.
- New pump station’s layout meets Hydraulic Institute (HI) standards.
- A new biofilter odor control system. The new biofilter will be a state-of-the-art, built-in-place biofilter, designed to treat the foul air from the MPS.
The Pleasure Bay Crossing and Main Pump Station Replacement is a large and critically important project for TRWRA, intended to replace two vital components: the 50-year old Pleasure Bay Interceptor (PBI) and the offsite 50-year old Main Pump Station (MPS), which convey flows to the TRWRA Wastewater Treatment Plant (WWTP). Both of these aging facilities are susceptible to failure, exhibiting internal corrosion, sagging, buildup of slime, and surcharging, all of which pose risks to of the provision of continuous, long-term reliable wastewater service. In addition, should the pipeline or pump station fail, the ramifications would be detrimental to the marine ecology of Pleasure Bay. TRWRA is also looking towards the future, with plans to increase the capacity of the MPS to 50 mgd to accommodate a growing community with increased wastewater flow in its service area.
The new 54-inch Fiberglass Reinforced Pipe (FRP) PBI will convey sewage flow beneath Pleasure Bay from a new intake and vortex drop structure located at Sommers Park in the Borough of Oceanport to a new pump station. The interceptor will be installed in a 10-foot maximum diameter tunnel, constructed with an open face tunnel boring machine (TBM) at a length of 3,250 feet and depth of approximately 85 feet below Pleasure Bay to avoid existing soft marine soils. The tunneling operations will be launched from the Monmouth Beach plant site and the TBM will be removed at a reception shaft at the Oceanport site. As part of the conveyance improvements, a new 30-inch FRP Monmouth Beach Interceptor (MBI) with a length of 950 feet will be rerouted from the existing offsite pump station to the new onsite pump station located on the TRWRA WWTP property.
Hazen TRWRA Project Manager and New Jersey Office Manager Bill Gettings presents Cherrystone Hard Clams from the existing Pleasure Bay Marine Ecosystem. The Pleasure Bay Crossing and Main Pump Station Replacement project will protect this environmental resource for future generations' use.