Does anyone know anything about "poly-foam"? The entire terrain south of the ortho building to the power plant was filled with 7-8ft of these giant white cubes. I imagine that they are put there to reduce the weight load on the connecting tunnel structure below as dirt and rocks would be an enormous amount of weight added with the road over head. I looked into it a little bit and read that a good portion of Millennium Park had used poly-foam for the same reason of weight reduction. Does any one know what this stuff is made of or how much it weighs per cubic ft vs dirt?
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