There are two scenarios, one ...

There are two scenarios, one try Phytoremediation, this as Sudhakar has suggested can be complex and time consuming. The contaminants can be extracted out of the soil using leafy plants like cabbages and the biomass can be used for generating biogas, however, the sludge shall have to be incinerated before disposal.

While the contamination of existing groundwater is difficult to address, the fresh rainwater collections can be directed into sterile artificial aquifers made with geocellular blocks, humongous capacities can be created without sacrificing the land use in builtup campuses. The sand bed filters made with sterile rock dust powder ensures that there is no possibility of the water getting in contact with chromite ore or any other pollutants. The rootzone over the sandbed provides the first barrier against contamination.

Water can stay put in these HDPE lined tanks for a long time if proper precautions are taken to prevent biofilms and dust laden pollen from getting in contact with water. Raw water can be released for drinking water purposes after suitable tertiary treatments and testing.