PanGEO was the geotechnical engineer of record for the design/build expansion of the Port of Seattle's new containerized cargo handling facilities at Terminal 18 on Harbor Island. The renovated facilities will support the operations of the Stevedoring Services of America Corporation. The design/build team was led by Washington Group International and Parsons Brinckerhoff. The expansion included paving approximately 100 acres of the upland facility, constructing or renovating five buildings, constructing rail links and surface streets, constructing an 8-span bridge (over 1,000 feet long) over Klickitat Avenue and a pedestrian bridge over Florida Street. The geotechnical elements include explorations for the final design of these facilities and geotechnical construction support services for the foundations of the various structures.
A Leffer TM oscillator was used to construct the drilled shafts supporting the Klickitat Avenue Overcrossing. This was the first use of a 3 meter diameter oscillator for bridge foundation construction in the Northwest. The use of this construction technique enabled PanGEO to use an aggressive design for the frictional resistance of the shafts. The bridge successfully withstood the Feb. 28, 2001, Nisqually Earthquake that resulted in extensive liquefaction on Harbor Island and other areas along the Duwamish.