From a contaminant distribution standpoint, this usually means delineation of the nature (contaminants and concentrations) and extent. From a risk assessment standpoint, this usually means potential migration pathways are evaluated and exposure point concentrations adequately quantified. A key decision point in the life of a remediation project is deciding when the investigation phase is done and the CSM is sufficiently complete to identify and select appropriate remedies. We must balance the degree of uncertainty with current decision needs. Remediation and post-remedial action monitoring – Provide a means to optimize (or modify) the remedy through iterative updates as performance monitoring data are collected.īecause we cannot “see” into the ground or characterize every aspect of a site, CSMs will always be based on assumptions and interpretations.Remedy selection and design – Form the basis of the feasibility study and remedial design.Characterization – Dictate any needed modifications to address important data gaps by incorporating new information through iterative updates as the investigation proceeds.Baseline – Guide the investigation based on systematic planning.Preliminary – Initiate an investigation.They have a different role in each phase of a remediation project from preliminary investigation through remedial action (often overlooked) and post-cleanup monitoring: Dynamic Models Evolve with Remediation ProgressĬSMs are not static, and should never be considered totally accurate or “complete” instead, they should be viewed as dynamic and evolving as the remediation process progresses and new data are collected.
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