In situ chemical oxidation
In situ chemical oxidation (ISCO) is an environmental remediation technique proposed for soil and/or groundwater remediation to lower the concentrations of targeted environmental contaminants to acceptable levels. ISCO would be accomplished by introducing strong chemical oxidizers into the contaminated medium (soil or groundwater) to destroy chemical contaminants in place.
Source: Wikipedia — In situ chemical oxidation (CC BY-SA 4.0)