Answer:
(Answers may vary.)
There are two classes of soil remediation: in-situ and ex-situ.
In in-situ remediation, there is no excavation of the contaminated soil. This remediation is an economical way of cleaning up. However, it takes a long time for the treatment to be effective. In addition, the treatment is not uniform because of variability within soil and difficulty in monitoring remediation progress.
Ex-situ remediation involves excavating a contaminated area. In this method, the soil is either treated on the same site or transported to a remote site for cleaning. This type of remediation is complex and expensive, but very effective. It involves the following:
homogenization of the contaminated soil before treatment
monitoring to ensure that the soil is cleaned to the required level
Explanation:
