In Situ Chemical Oxidation

About the Resources:

ITRC's In Situ Chemical Oxidation Team updated and revised the ITRC technical and regulatory guidance document, “Technical and Regulatory Guidance for In Situ Chemical Oxidation of Contaminated Soil and Groundwater (ISCO-1). A new chemical oxidant, persulfate, is included in the updated document, along with a more detailed presentation of some of the key concepts of remedial design such as injection radius of influence, NOM oxidation and its effects on contaminant concentrations, and SOD test methods/interpretation of results. The team also developed a methodology to evaluate ISCO effectiveness/technology selection based on contaminated media and phase. New sections were added regarding the utilization of chemical oxidation in conjunction with other technologies, more regulatory examples/policies will be gathered from states not included in ISCO-1, and the case studies will be presented in more detail. The new document, “Technical and Regulatory Guidance for In Situ Chemical Oxidation of Contaminated Soil and Groundwater, Second Edition (ISCO-2)” was released in January 2005.

Team Background:

Chemical oxidation technologies were often used to remediate contaminated soils and groundwater. In order to ensure the safety of human health and the environment, and to expedite the deployment of these technologies, it is imperative regulators, facilities, and stakeholders be informed to the greatest extent possible.

The ITRC Team felt that although chemical oxidation was not a new technology, it was one of the most misunderstood technologies. Therefore, it was apparent a guidance document was needed to help regulators determine whether it is not only applicable but to ensure it is being implemented correctly using the appropriate reagents. Because the oxidants must be injected into the subsurface, an underground injection control permit will be required in most instances. There are both federal and state requirements that must be met before implementing this technology.