In Quebec, the following years marked the onset of the Quiet Revolution, a heady period of rapid change for both the province as well as Desjardins & Sauriol, whose business had grown to 30 employees by 1961.

The province was brimming with engineering-construction megaprojects and the firm landed numerous transportation and municipal engineering contracts, expanding its business to include geotechnical, structural, electrical and mechanical departments.

[4] Headquartered in Matagami, Dessau's team oversaw soil studies, layout verification, logistics and the building of a strategic road through forests and other unforgiving landscape elements.

A multidisciplinary team of engineers, geologists, surveyors, loggers, bush pilots, laborers, truckers and technicians was mobilized and they managed to complete the project a full year ahead of schedule.

Since the early 1980s, Dessau has espoused a "green dream", from restoring waterways in the greater Montreal area to more recent conservation plans that now play a key role in Quebec's energy strategy.