Owner: City of Portland

Partner: Sargent Corporation

Type: Excavation Support

Location: Portland, Maine

Project Description: Drove 1.8 million pounds of sheet pile up to 98 feet deep; installed 1.3 million pounds of internal framework.

Challenge: The combined sewer overflow storage tank required excavating 36 feet below grade in soft soils next to an existing highway embankment.

Solution: Extra lengths of sheet pile were spliced and driven to satisfy global stability requirements. We utilized heavy internal framing to support loads from the soft soils and high water table.