Glossary

Phase II Environmental Site Assessment (Phase II ESA)

Also known as: Phase II Environmental Assessment, Subsurface Investigation, ESA

An intrusive environmental investigation, typically involving soil, groundwater, or soil-gas sampling and laboratory analysis, undertaken to confirm and characterize a Recognized Environmental Condition identified in a Phase I ESA.

A Phase II ESA is triggered when a Phase I ESA identifies one or more RECs that cannot be resolved through records review and site reconnaissance alone, and it is scoped specifically to test whether contamination is actually present, and if so, at what concentration, in what media, and over what extent, using boring, monitoring wells, or sub-slab vapor probes as appropriate to the suspected contaminant and pathway. Unlike a Phase I ESA, which is a non-intrusive records and observation-based assessment, a Phase II is a discrete, contaminant-specific scope of work that a consultant designs around the particular REC in question, so its cost and duration vary enormously depending on the site's history and the number of RECs requiring investigation. Results feed directly into transaction decisions: a Phase II that confirms no contamination above regulatory screening levels can close out a REC and clear the way for financing on standard terms, while confirmed contamination typically triggers negotiation over remediation responsibility, price adjustment, escrowed cleanup funds, or a pollution legal liability policy before the deal can proceed.