A Phase 1 Environmental Site Assessment would typically identify what type of information about the site's history?

• A. Past uses of the property
• B. Current emission levels
• C. Exact concentrations of contaminants
• D. Real-time groundwater data

Answer: (A)

Phase I focuses on historical information about how the property was used in the past to flag potential environmental concerns. By researching past owners, tenants, and activities, and reviewing historical maps and records, the assessment identifies plausible sources of contamination tied to previous uses—like gasoline stations, dry cleaners, manufacturing, or waste disposal. This helps determine whether a more detailed Phase II investigation is needed to confirm any issues.

Current emission levels, exact contaminant concentrations, and real-time groundwater data come from sampling and monitoring conducted in Phase II or later. They’re not what Phase I is designed to uncover about the site's history.