Contamination assessment for US real estate, known as 'ESA'
For other uses, see Level 1 (disambiguation) and Phase 1 (disambiguation).
Any piece of real estate can be the subject of a Phase I ESA.
In the United States, an environmental site assessment is a report prepared for a real estate holding that identifies potential or existing environmental contamination liabilities. The analysis, often called an ESA, typically addresses both the underlying land as well as physical improvements to the property. A proportion of contaminated sites are "brownfield sites." In severe cases, brownfield sites may be added to the National Priorities List where they will be subject to the U.S. Environmental Protection Agency's Superfund program.
The actual sampling of soil, air, groundwater and/or building materials is typically not conducted during a Phase I ESA. The Phase I ESA is generally considered the first step in the process of environmental due diligence. Standards for performing a Phase I site assessment have been promulgated by the US EPA[1] and are based in part on ASTM in Standard E1527-13.[2]
If a site is considered contaminated, a Phase II environmental site assessment may be conducted, ASTM test E1903, a more detailed investigation involving chemical analysis for hazardous substances and/or petroleum hydrocarbons.[3]
^"EPA Standards and Practices for All Appropriate Inquiries -Final Rule" (PDF). Archived from the original (PDF) on 2008-12-03. Retrieved 2007-08-25.
^"ASTM Standard E1527-13 for Phase I ESAs".
^"ASTM Standard E1903 for Phase II ESAs".
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