Unless there remains some antisceptic by-product, the flora can quickly take back over if mixed with "healthy" soil. I would be more concerned about effectivel

Unless there remains some antisceptic by-product, the flora can quickly take back over if mixed with "healthy" soil. I would be more concerned about effectively turning the soil into clay, that is reducing the particle size too small for many types of plants. I guess mixing it with an aggregate afterward could help. Then again, the highly processed nanoscale dirt could be an ideal building product able to supplement concrete or enabling even more durable rammed earth houses. Not sure anyone would want to live inside a 99.9% PFAS-free dirt house though.