A Swiss technique in concrete foundation construction was used recently in Canada to minimize vibration in a new power generating station at Edmonton, Alberta. The spring supported foundation table under the turbine generator that eliminates vibration almost completely by providing vertically the low level of vibration which occurs horizontally in low-tuned concrete foundations. The spring mattress technique involves the use of two slabs separated by stiff steel springs. The upper slab rests on two beams on a set of perpendicular reinforced concrete columns- made very heavy so as to provide mass, yet adequately spaced to permit entry space for machine parts and piping. This slab weighs 2,000 metric tons and is supported by 126 springs, arranged in two rows of 63 each and mounted on the beams below each side of the slab. The sub-structure of the power generating station, consisting of the two rows of columns and the spring support beams, was built first. Then the upper slab was formed on independent shores and concreted, with a nine inch gap being left between the top of the spring support beams and the underside of the slab. The upper slab was immobilized by set screws which were turned on to react tightly between the spring support beams and the underside of the slab. The upper slab was left in this state while the turbine-generator set was erected. The weight of the machine was then transferred to the springs, again by turning on the treaded studs.