ESA · Environmental Site Assessment
The Phase I/II investigation establishing a site's contamination status; it gates acquisition diligence at the front end and the environmental closeout that ends decommissioning liability.
Current numbers
$2,200–4,000Phase I ESA cost per site (ASTM E1527-21); ~2–3 weeks to report; higher for industrial brownfields
$2k–$5kPhase I ESA per ASTM E1527-21 (higher end for industrial/brownfield histories)
$5k–$100k+Phase II ESA (intrusive sampling); large/contaminated sites exceed $100k