Phase II ESA & targeted investigation

When existing information cannot resolve a concern, a focused subsurface investigation can help determine whether a release is present and what additional work may be appropriate. Scope follows the property’s history, the potential source, and the decision you need to make.

When might a Phase II ESA be appropriate?

A documented release, a plausible unassessed source, or a significant information gap can support additional investigation. A REC is not proof that contamination is present at a particular concentration, and it does not prescribe a universal sampling program. The environmental professional explains the concern so the client, lender, and project team can agree on the next decision.

How is a sampling scope developed?

Start with a conceptual understanding of the likely source, chemicals, release mechanism, geology, groundwater, and potential exposure pathways. Select sample locations, depths, media, laboratory methods, and quality controls to answer specific questions. Utility clearance, access, permits, waste handling, and licensed subcontractors may affect field planning and budget.

What happens after sampling?

Laboratory results are evaluated with site conditions, quality-control information, and relevant screening criteria. Exceeding a screening level is a reason for evaluation, not an automatic statement that remediation is required. Results may support no further investigation, additional delineation, a vapor assessment, or regulatory coordination. A limited investigation does not necessarily define the full extent of a release.

Related guidance

• Phase I Environmental Site Assessment

• Understanding your Phase I findings

• Vapor, PFAS & evolving concerns

Browse the Phase I ESA information hub

Discuss your property

Share the property address, parcel numbers, transaction purpose, lender requirements, and your deadline so we can discuss an appropriate scope.

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Primary references

• EPA · Vapor intrusion technical guidance

General guidance does not replace a property-specific assessment. The applicable standard, regulations, scope, and available evidence govern the evaluation.