Kressview springs condominium, Cambridge, Ont., Canada

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Courtesy of Presto Geosystems

Unstable soils, steep embankments, limited right-of-way and site access and other adverse site conditions can make design and construction decisions difficult and the outcome costly. The developer of the Kressview Springs condominium project in Cambridge, Ontario, Canada was faced with a series of these unique construction challenges during construction in the Winter of 1989.

Situated on the side of a relatively steep river valley, the project required constructing a 260 m long driveway embankment rising from grade level at the site entrance to a maximum height of 11 m near the condominium building. Peat deposits up to 2.5 m in depth under a 30 m section of the proposed site created an unstable area. Removal of the peat and replacing it with good quality foundation materials would have added to construction costs and caused destruction of several large willow trees along the stream bank.

Therefore, any system chosen for stabilizing the driveway embankment would be required to conform to the steep, contoured landscape, tolerate differential settlements as great as 600 mm, and support heavy vehicles during construction. A vegetated facia was desired in order to blend naturally with the surroundings. Presto’s GEOWEB® cellular confinement system successfully met all of these restrictive construction requirements.

The Geoweb system is manufactured from polyethylene material that is resistant to penetration by chemicals and water. The material eliminates any potential for cracking, spalling, or corrosion that typically affects concrete, steel and timber-based systems.

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