Contaminants of concern (COCs)

Substances selected for evaluation because site history, prior findings, or the investigation’s objectives indicate they may be relevant. The list depends on the property and question being investigated.

Why it matters

Choosing the analytical scope is a substantive decision. A generic laboratory panel may not address the materials associated with a specific historical use. The report should distinguish substances tested from conditions that remain unassessed.

In practice

A project example

A former industrial process may involve chemicals outside a routine petroleum-focused analysis. Site history helps determine the appropriate investigation.

General educational guidance from KOW Building Consultants. Examples are illustrative, not project records. The applicable contract, standard, program, and jurisdiction control the requirements for a specific assignment.