Liquified Natural Gas (LNG) Site Preparation

In this ongoing site works and site development project, our client, a large engineering, procurement, and construction firm, is self-performing the soil improvement at a $13 billion liquefaction facility and called for our assistance to complete the laydown area for soil and soil disposal. The construction laydown area will provide storage of unsuitable and spoil material from the adjacent facility. Ultimately, the design of the area will control the displacement of weaker soils in the marsh and wildlife refuge that is also next to the facility.

Our team is currently performing site preparation and the construction of an access road and sheet pile barrier wall to extend the project site.  Initially the proposed scope of work included shallow soil mixing with quicklime and Portland cement. However, due to the site conditions and the inability of the narrow soil improved foundation to support the access road the design was modified.  The modified design included the re-use of lime and cement stabilized spoils in combination with a multi-layered aggregate and geosynthetics to construct a 6-ft thick access road.  The newly constructed access road provides a tide resistant road for access around the laydown area and a suitable foundation to install the proposed sheet pile perimeter wall.

The installation of approximately 367,400 square feet of sheet pile covering over 7,800 linear feet using two Liebherr LBR23 pile driving rigs and a vibratory hammer on a 120,000 lb.  hydraulic excavator to finalize the sheets to grade.   Forgen worked with the client for the as-built installation of the associated corners and the revised alignment. All sheet pile work was installed from the elevated 26-ft wide access road.  

Additional site work included: erosion and sediment controls, strict adherence to limits of disturbance, the clearing grubbing of the marsh area and associated trees, loadout of spoils for transportation to the site, unloading of sheet piles, site improvements within the sheet pile structure, and a stormwater pollution prevention plans.