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The issue is partially controlled and partially uncontrolled fill placed over the years on an existing slope to a maximum depth of 20'+/-. The idea is to reduce the load and therefore reduce potential settlement. I'm not convinced that this is an appropriate measure below a building.

To avoid a very costly overexcavation of unsuitable soils of the manitude of 10 - 15 feet.

I've heard of using geofoam under roadways and embankments, but can they be used under building foundations?

I have a situation where we will potentially import fill material with a significant portion of fist sized, clear gypsum crystals throughout the fill. What are the risks on a site where there will be a one story building and a surface parking lot? Does anyone have any experience using this...