An Environmental Site Assessment (ESA) is a due diligence process conducted to identify existing or potential environmental contamination on a property. Its primary goal is to assess environmental conditions and liabilities associated with the land, often before a real estate transaction. A Phase I ESA involves records review and a site visit to identify potential concerns, while a Phase II ESA involves sampling and testing to confirm the presence and extent of contamination. The ESA is fundamentally an investigative tool for risk and liability management.

A. This describes a Remedial Action Plan (RAP), which is a plan to clean up a site after an ESA has identified contamination requiring remediation.

C. This describes an Environmental Impact Assessment (EIA), a broader study evaluating the potential effects of a proposed project on the environment.

D. While an ESA's findings heavily influence development potential, its direct purpose is to assess environmental liability, not to evaluate development options.

1. Andrews, G. C. (2019). Canadian Professional Engineering and Geoscience: Practice and Ethics (6th ed.). Nelson. (Chapter 13, p. 299, "Environmental Site Assessment").

2. Canadian Standards Association. (2016). CSA Z768-01 (R2016): Phase I Environmental Site Assessment. This standard defines the principles and procedures for conducting a Phase I ESA, focusing on identifying potential contamination and liability.