ASTM E1527-21 is the industry standard for conducting Phase I Environmental Site Assessments (ESAs). Released in late 2021, this updated standard strengthens environmental due diligence requirements and introduces key changes that environmental professionals need to understand.
What is ASTM E1527-21?
ASTM E1527-21 is the most recent standard practice for conducting Phase I Environmental Site Assessments. It replaced the previous E1527-13 standard and provides guidelines for identifying Recognized Environmental Conditions (RECs) through records review, site visits, interviews, and other methods.
Key Changes in ASTM E1527-21
Revised REC Definition
The standard provides clearer guidance on identifying Recognized Environmental Conditions (RECs), including improved definitions and an updated appendix with examples to help environmental professionals make consistent REC determinations.
Historical Research Requirements
The new standard requires review of historical sources for the subject property and adjoining properties. Standard historical sources must be reviewed unless they are unlikely to provide useful information about conditions at the property.
Emerging Contaminants
ASTM E1527-21 addresses emerging contaminants like PFAS (per- and polyfluoroalkyl substances). While not automatically considered a REC until regulated under CERCLA, the standard provides guidance on how to handle these substances in Phase I ESAs.
Core Requirements of ASTM E1527-21
Records Review
- Review of physical setting sources
- Standard environmental record sources
- Historical use information for the property
- Historical use information for adjoining properties
- Search for environmental cleanup liens
- Review of agency files and records
Site Reconnaissance
- Visual inspection of the property
- Documentation of current uses
- Observation of adjoining properties
- Assessment of physical limitations
- Photographic documentation
Interviews
- Current and past property owners
- Site managers and occupants
- Local government officials
- Others with knowledge of the property
Important Report Elements
Required Documentation
- Findings, opinions, and conclusions
- Environmental professional statement
- User-provided information
- Research documentation
- Data gaps and their significance
- Site photographs and maps
Significant Dates and Timelines
- Report must be completed within 180 days of primary components
- Information from searches must be dated no more than 180 days prior to report completion
- Interviews and visual inspections must be conducted within 180 days of report completion
- Overall shelf life of one year from completion
Environmental Professional Requirements
The standard defines specific qualifications for environmental professionals, including:
- Professional engineer or professional geologist license plus 3 years of relevant experience
- Bachelor’s degree or higher in science or engineering plus 5 years of relevant experience
- 10 years of relevant full-time experience
- Required supervision and responsible charge experience
Best Practices for Compliance
- Document all research attempts, even if unsuccessful
- Clearly explain the significance of data gaps
- Maintain detailed site reconnaissance notes
- Review historical sources for both subject and adjoining properties
- Provide clear justification for REC determinations
Common Challenges and Solutions
Data Gaps
The standard requires clear identification of significant data gaps and their impact on the ability to identify RECs. Environmental professionals must explain how these gaps affect their conclusions.
Property Access
When physical limitations restrict property access, the standard requires detailed documentation of these limitations and their impact on the assessment’s findings.
Conclusion
ASTM E1527-21 represents a significant evolution in environmental due diligence standards. Understanding and following these requirements is essential for environmental professionals, property buyers, lenders, and others involved in commercial real estate transactions.
Frequently Asked Questions
When did ASTM E1527-21 become effective?
The standard was published in November 2021 and became the industry standard in 2022.
Is ASTM E1527-21 required by law?
While not directly required by law, it is recognized by the EPA as meeting the requirements for All Appropriate Inquiries under CERCLA.
How long is an ASTM E1527-21 Phase I ESA valid?
The standard components are valid for 180 days and must be updated after that time. The entire report has a one-year shelf life.
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