(1)Try analyzing the chemistry of the soil i.e., composition of the metals, pH etc.

(2) Fortify the soil sample with a carbon source (e.e., glucose) and incubate for a specific period to monitor any growth and decay of contaminants.

(3) If there is any decay of the contaminants optimize the condition of the decay.

(4)If there is no growth/no decay try isolating the predominant strains from the native soil sample and individually try them for detoxification of the predominant metal(s) identified in step 1.

All the best !!!

Hi Ibrahim,

I am fully agree with Siddhartha above. You can check this article

http://www.scientific.net/AMR.20-21.287

and other previous reports from this author.