Salem Lateral Pipeline Project, Salem-Beverly, Massachusetts
|Client:||Spectra Energy / Algonquin Gas|
|Project Date:||May, 2015 - November, 2016|
The goal of this project is to create the pipeline capacity necessary to deliver affordable supplies of clean-burning natural gas from the existing Algonquin Gas Transmission pipeline system to the Salem Harbor Station facility, which is being redeveloped into a natural gas-fired electric-generating plant. Delivers natural gas supplies for the planned Footprint Power Salem Harbor Development, LP Station facility and includes construction of a new metering and flow regulating station within the Salem Harbor Designated Port Area (DPA). Work took place primarily within Beverly Harbor, Collins Cove and the City of Salem, and industrial properties. This effort is one of the latest examples of an industry migrating away from coal towards natural gas as a feedstock for making electricity.
- Cashman's work included the installation of temporary mooring piles and a cofferdam in Beverly Harbor; two horizontal directional drill (HDD) crossings across Beverly Harbor and Collins Cove; a meter station at the Salem Harbor Footprint Power Plant; and 900 feet of pipeline connecting the HDDs and meter station.
- Required hydraulic dredging of an 85' x 55' area of the seafloor to a depth of -8.5 feet in Beverly Harbor; ~1,500 cubic yards of sediment was excavated and placed in hopper barges for temporary storage / decanting. Decanted material was placed back into the cofferdam.
- An 8' x 10' permanent concrete vault was installed below the seafloor in order to conduct future internal inspections; upper elevation of this vault lies ~1 foot below the existing seafloor elevation.
- Included wetlands protection and strategies to deal with local Essential Fish Habitat (EFH) for various species and life stages.