What is CERCLA and how does it relate to site characterization?

• A. A voluntary guidance document for site owners about risk communication.
• B. A federal program funding research on groundwater flow.
• C. The Comprehensive Environmental Response, Compensation, and Liability Act; it governs assessment/remediation of hazardous waste sites and requires data collection to support decisions.
• D. A state-level enforcement policy for urban redevelopment.

Answer: (C)

CERCLA stands for the Comprehensive Environmental Response, Compensation, and Liability Act. It’s a federal law created to address releases of hazardous substances and to fund and oversee cleanup when responsible parties can’t or won’t do so. A key part of CERCLA is that before any cleanup decision is made, there must be thorough data collection about the site. This happens through the remedial investigation and feasibility study under the National Contingency Plan, which gathers information on what contaminants are present, how much there is, where they are located (soil, groundwater, sediments), how far they have spread, and how people or ecosystems might be exposed. That data forms the basis for risk assessment, site prioritization, and the selection of remedies that will protect health and the environment. So CERCLA shapes site characterization by making systematic, decision-support data collection essential to determine the extent of contamination, the risks, and the appropriate cleanup approach.