PROJECT PROFILE City of Sarnia Riverfront Boardwalk Challenge In 2014, a nearly 1,200-foot long timber pedestrian promenade in Ontario’s City of Sarnia was nearing the end of its life. The pressure treated timber lasted less than 20 years in Canada’s harsh winters, and had rotted to the point where the substructure was failing and boards could no longer be nailed down – rendering it essentially irreparable. Adjacent to a rail spur, built over a steep bank, and including physical obstacles like fire hydrants, GPS survey monuments, and light poles, this location required attention to detail by the engineering team. A slab on grade (cast-in-place concrete) was not practical for the elevated portion of the walkway. The city’s operations team was adamant that the replacement be more du

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