Standards & guidance · Defined
ASTM E1903 — Phase II ESA
An ASTM practice providing a framework for Phase II environmental site assessment, including investigation of potential contamination.
Standards references reviewed September 15, 2026. These summaries explain purpose, not the full standard. Confirm the edition required by your contract, program, and jurisdiction; publication of a newer edition does not automatically change local requirements.
Why it matters
The investigation must address defined objectives. It is not a universal sampling checklist, and a Phase II does not necessarily delineate every impact or design a cleanup.
In practice
A project example
Targeted soil sampling addresses a former process area while other site questions remain outside that investigation.
Technical references
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.