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Providing a deep soil mixing (DSM) buttress 500 feet long (parallel to the river) by 105 feet wide (perpendicular to the river), and extending a minimum of 2 feet into the underlying gravel and cobble deposit; site preparation, including saw cutting and removal of existing pavement, track removal, and underground utility demolition; reconstruction of underground utilities; management of excavation and DSM spoils; site cleanup; and transport of approximately 15,000 cubic yards of material generated by the earthwork and soil improvement activities to Portland International Airport (PDX) property to support future development.