US Patent 7255514 Method and system for removing contaminants from soil

A method and system for removing contaminants from contaminated soil at a site utilizes particle size segregation and particle density segregation to yield a plurality of fractions, whereby each of the fractions are tested and identified for the presence of unacceptable levels of contaminants, and the soil fractions from the contaminated soil at the site corresponding to the identified contaminated fractions are collected for subsequent disposal or treatment, while the remaining untainted soil fractions are homogenized and returned to the site.