Aecon executed the project through sustainable engineering and construction practices that considered all economic, environmental and social aspects of the development. Highway design considerations included working in soft clay, short construction periods,
and cold weather conditions that significantly influence options for embankments, abutments, and foundations. Bridge design considerations included ship impact assessments, seismicity, wind, river hydraulics, and ice.
During construction, special attention was focused on waste reduction by reusing much of the existing material from excavation and using recycled materials in fills, aggregates and concrete. This project was constructed with the highest regard to the environmental impact study, done in accordance with provincial regulations. The specific guidelines outlined in the environmental impact study required the project to be engineered and constructed following measures to minimize noise, dust and water contamination. Complying with these measures was essential to protect wildlife habitats, and AECON worked very closely with environmental and ecological consultants to ensure that impacts are minimized.
Scope of work included the construction of a 42-kilometer, dual two-lane highway, two large bridges crossing the St. Lawrence River (1,800 m long) and the St Lawrence Seaway/Beauharnois Canal (2,500 m long). Other project features include 30 other bridge structures over rivers, existing roads and railways, as well as a short tunnel under a canal.