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What were the Styrofoam blocks used for at the West Approach?

April 26, 2017approach blocks Styrofoam Used West

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What were the Styrofoam blocks used for at the West Approach?

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Expanded Polystyrene (EPS) was installed as a light weight fill at the West Approach to minimize settlement. 1 metre of fill was placed on top of the EPS. Without the EPS the soft lake sediments would have resulted in long term settlement problems for the bridge approach.