I am currently working on a building that is remediating a PERC spill using a Soil Vapor Extraction System. While remediating, severe building settlement started happening around the column closest to the remediation. We know the column is pulling everything down with it but aren't sure exactly what is happening beneath the slab. We plan to excavate the column footing as there are other site problems that are coming into play but I was wondering if anyone else has experienced settlement when dealing with a Soil Vapor Extraction System? I have been researching the systems and find no data involving foundation settlement but find it hard to believe the installation of the system and the column movement are not linked somehow.
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