>>509068416
I didn't vanish, nigger. We have this here too, its called seismic base isolation. You put the structure on rollers, or more precisely, rubber footings, to dampen force transfer from the foundation to the structure.

>>509069404
Its crazy that they force this. If you cover inorganic contaminated soil with 6-12" of clean fill/soil, its harmless since the contaminants aren't mobile outside of very low pH (or very high pH in the case of arsenic). Only VOCs need prompt remediation.