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Chesie, I share your frustration. There does not exist compaction equipment to pack 4' of clay, and still keep the home's foundation intact.
We'd still install a project like this; we'd tell them there is still a chance for settling, and that'd repair settling that occurred within our guarantee period (2 years). We'd over excavate, and compact lifts of 3/4-"- with layers of gried in between. There was a study in Florida recently about the power of grid to stabilize pavement bases, and I've found it to work pretty well.
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