Site Characterization and ISCO Treatment Goals
Site characterization methods to develop a conceptual site model (CSM) and enable screening and conceptual design of an in situ chemical oxidation (ISCO) technology to achieve ISCO treatment goals.
Development of a valid CSM is critical to enable effective screening and conceptual design of ISCO technologies.
Expedited site characterization approaches such as the Triad Approach are well suited to development of a CSM for ISCO.
Effective characterization for ISCO screening and conceptual design can be achieved by integrating technologies and methods spanning conventional to advanced diagnostics.
- Site characterization for ISCO requires the same general level of understanding that is necessary to select, design, and implement other in situ treatment technologies, but with additional focus on subsurface hydrogeologic and geochemical conditions, including:
Reactivity of an oxidant with subsurface media (can control oxidant depletion rate)
Oxidation-reduction potential (can provide insight into oxidant persistence)
pH and alkalinity (can influence oxidation chemistry and free radical scavenging)
Presence of redox- and pH-sensitive metals (can result in post-treatment toxicity)
Treatment goals and operational endpoints need to be carefully established for an ISCO technology if it is to be successively deployed as a stand-alone remedy or as a component within a combined approach.
KeywordsClay Permeability Porosity Migration Chromium
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