An Update On Pending Revisions To The Phase I Environmental Site Assessment Standard

Greenbaum, Rowe, Smith & Davis LLP

[co-author: Chemmie Sokolic]

ASTM International is required to review and either update or renew the existing version of its ASTM E1527 Phase I Environmental Site Assessment standard (Phase I ESA standard) every eight years. Since the current version was last updated in 2013, it is now time for a reassessment.

This Client Alert is the first in a series of advisories regarding potential upcoming revisions to the Phase I ESA standard.


The Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) requires prospective purchasers of commercial and industrial properties to conduct appropriate environmental due diligence to qualify for certain environmental legal protections. Since 1993, the Phase I ESA standard has come to be recognized as the defining standard of what comprises “good commercial and customary standards and practices” for conducting environmental due diligence. The goal of the Phase I process, as established by the Phase I ESA standard, is to identify recognized environmental conditions (RECs). Over the last few years, the ASTM E50.02 subcommittee has been hard at work examining numerous sections of the Phase I ESA standard to bring it up to date with what constitutes good commercial and customary practice in 2021. These revisions may impact prospective purchasers as they navigate their commercial and industrial real estate transactions as well as their ability to receive financing on real estate transactions.

Proposed Changes

Some of the proposed changes to the Phase I ESA standard include the following:

  • Change No. 1: Definition – the definition of REC is being revised to more clearly convey that RECs include not only confirmed releases of hazardous substances or petroleum products in, on, or at the subject property, but likely releases as well. This is true whether a release of hazardous substances or petroleum products occurred at the subject property itself, but also if it occurred, or even likely occurred, at nearby properties as well.
  • Change No. 2: Flow Chart – A flow chart is being added in an appendix to the Phase I ESA standard that will assist practitioners in determining if a particular condition identified at a property constitutes either a REC, a “historic REC,” a “controlled REC,” a “de minimis condition,” or a “finding.”
  • Change No. 3: Examples – Several examples of Phase I ESA findings are being provided in an appendix for illustrative purposes, and as an accompaniment to the flow chart discussed above in Change No. 2.

What’s Next

It should be noted that although the revised Phase I ESA standard is currently undergoing its third internal ASTM ballot review – and is due to be out of ballot by April 2, 2021 – it is not yet finalized, and the potential updates discussed in this Alert are subject to change. We will continue to keep you advised as the Phase I ESA standard makes its way through the ASTM balloting and the U.S. Environmental Protection Agency’s review process.

It is expected that the new Phase I ESA standard will be finalized and promulgated later in 2021. Please contact the authors of this Alert with questions related to proposed revisions to the Phase I ESA standard or to discuss impacts to your specific real estate transactions in greater detail.

Written by:

Greenbaum, Rowe, Smith & Davis LLP

Greenbaum, Rowe, Smith & Davis LLP on:

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