Conducting Interviews with Neighbors for a Phase I ESA

Knowledge Center

Conducting Interviews with Neighbors for a Phase I ESA

Environmental consultant interviewing neighboring property occupant during Phase I ESA to gather site history and environmental observations

Written by

GAEA Technologies

in

,
Share the knowledge

Conducting interviews with neighbors—often described as speaking with “a reasonable number of occupants of neighboring properties”—is an important component of a Phase I Environmental Site Assessment (ESA). While not always emphasized as strongly as records review or site reconnaissance, neighbor interviews can provide valuable local insight that fills critical information gaps.

Industry standards such as ASTM E1527-21 recognize the importance of these interviews as part of good commercial and customary practice. Neighbors can offer first-hand observations and historical context that may not be captured in official records, databases, or even previous environmental reports.

This guide provides a comprehensive, practical framework for conducting neighbor interviews effectively, ethically, and in compliance with Phase I ESA requirements.

Purpose and Objectives

The primary objective of interviewing neighbors is to obtain independent, third-party perspectives on the subject property and surrounding area.

Unlike property owners or government officials, neighbors often provide:

  • Unfiltered observations
  • Long-term community knowledge
  • Insights into undocumented activities

Why Neighbor Interviews Matter

Environmental risks are not always formally recorded. Neighbor interviews can reveal:

  • Past uses that were never documented
  • Informal or illegal dumping activities
  • Small spills that were not reported
  • Historical operations predating regulations
  • Changes in site activity over time

These insights can be critical in identifying:

  • Recognized Environmental Conditions (RECs)
  • Historical RECs (HRECs)
  • De minimis conditions

Key Objectives

The environmental professional (EP) conducts neighbor interviews to:

  • Understand historical uses of the subject property
  • Identify potential contaminating activities (PCAs)
  • Detect unusual events or incidents
  • Gather observations about adjacent properties
  • Supplement findings from records review and site reconnaissance

Identifying Appropriate Neighbor Contacts

The effectiveness of neighbor interviews depends heavily on selecting the right individuals.

1. Proximity to the Subject Property

Priority should be given to:

  • Immediately adjacent properties
  • Properties directly across the street
  • Nearby properties with clear views of the site

2. Length of Occupancy

Long-term occupants are especially valuable because they:

  • Have witnessed changes over time
  • Recall historical uses
  • May remember incidents that others do not

Ideal Interview Candidates

  • Long-term residential occupants
  • Business owners in the vicinity
  • Property managers
  • Maintenance personnel
  • Local workers familiar with the area

3. Diversity of Perspectives

Interviewing multiple neighbors helps:

  • Cross-verify information
  • Reduce bias
  • Improve reliability of findings

Timing and Approach

Neighbor interviews are typically conducted during the site reconnaissance phase of the Phase I ESA.

1. Timing

Best practice:

  • Conduct interviews while on-site
  • Use observations from reconnaissance to guide questions
  • Follow up if additional information is needed

2. Approach

Neighbor interviews are usually:

  • Informal
  • Brief
  • Opportunistic

However, they must still be conducted professionally.

3. First Contact

When approaching a neighbor:

  • Introduce yourself and your company
  • Explain the purpose: environmental due diligence
  • Emphasize that:
    • Participation is voluntary
    • Information will be kept confidential
    • They will not be identified in the report

4. Gaining Cooperation

Neighbors are under no obligation to participate.

To improve response rates:

  • Be polite and respectful
  • Keep the conversation brief
  • Avoid technical jargon
  • Reassure confidentiality

Ethical Considerations and Confidentiality

Maintaining trust and professionalism is essential.

1. Voluntary Participation

  • Never pressure individuals to participate
  • Respect refusals

2. Anonymity

To encourage openness:

  • Do not include names in the report
  • Use anonymized identifiers such as:
    • “Neighboring occupant #1”
    • “Adjacent property business owner”

3. Avoid Leading Questions

Questions should:

  • Encourage honest responses
  • Avoid suggesting answers
  • Focus on observed facts

Documentation Requirements

Even though neighbor interviews are informal, documentation must be thorough and defensible.

Required Documentation

The EP should record:

  • Date of interview
  • Approximate location of the neighbor relative to the subject property
  • Type of occupant (residential, commercial, etc.)
  • Summary of information provided

Important Note

Do not record:

  • Personal identifiers (unless required internally)
  • Sensitive or unrelated personal information

Key Interview Questions

Questions should be open-ended and focused on observable facts rather than speculation.

1. Duration of Occupancy

  • How long have you lived or worked in this area?

This helps establish the reliability of the information.

2. Property History

  • What do you recall this property being used for in the past?
  • Have you seen changes in how the property is used?

3. Unusual Observations

  • Have you noticed any unusual odors, smoke, or staining?
  • Have you seen drums, containers, or waste materials?
  • Have there been unusual activities or traffic patterns?

4. Spills or Incidents

  • Are you aware of any spills, leaks, or accidents?
  • Do you recall emergency response events (e.g., fire trucks, cleanup crews)?

5. Adjacent Property Activities

  • Are there nearby activities that concern you environmentally?
  • Have neighboring properties conducted industrial or commercial operations?

6. Site Changes

  • Have there been major changes to buildings or land use?
  • Was the property ever vacant or used differently?

7. Additional Contacts

  • Do you know anyone else who may have more information?

This can lead to additional valuable sources.

Integrating Neighbor Interviews with ESA Findings

Neighbor interviews should be used alongside:

  • Records review
  • Government interviews
  • Property owner interviews
  • Site reconnaissance

Triangulating Information

For example:

If a neighbor reports:

  • A strong chemical odor in the 1990s

The EP should:

  • Check historical records for industrial use
  • Look for regulatory violations
  • Inspect the site for indicators

Confirming or Challenging Data

Neighbor input can:

  • Confirm known risks
  • Highlight discrepancies
  • Identify previously unknown concerns

Reporting Requirements

Neighbor interview findings must be incorporated into the final Phase I ESA report.

1. Summarize Interactions

The report should describe:

  • Number of neighbors contacted
  • General locations
  • Level of participation

2. Maintain Anonymity

Use identifiers such as:

  • “Neighboring occupant #1”
  • “Adjacent commercial tenant”

3. Present Relevant Information

Include:

  • Observations of past uses
  • Reports of spills or unusual activities
  • Concerns about adjacent properties

4. Identify Data Gaps

If:

  • No neighbors were available
  • Individuals declined to participate

This must be documented as a data gap.

The EP must also assess:

  • The significance of the missing information
  • Its impact on the ability to identify RECs

5. Integrate into Conclusions

Neighbor interview findings must contribute to:

  • Identification of RECs
  • Assessment of environmental risk
  • Overall ESA conclusions

Common Challenges and Solutions

1. Limited Participation

Many neighbors may decline to participate.

Solution:

  • Approach multiple individuals
  • Keep interactions brief and respectful

2. Inaccurate or Biased Information

Memories may be imperfect or subjective.

Solution:

  • Cross-check with other sources
  • Avoid relying on a single account

3. Lack of Knowledge

Some neighbors may have limited awareness.

Solution:

  • Focus on long-term occupants
  • Seek multiple perspectives

4. Time Constraints

Neighbor interviews can be time-consuming.

Solution:

  • Prioritize key properties
  • Conduct interviews efficiently during reconnaissance

Best Practices for Effective Neighbor Interviews

1. Keep It Conversational

A relaxed, informal tone encourages openness.

2. Focus on Observations

Ask about:

  • What they saw
  • What they smelled
  • What they experienced

Avoid speculation.

3. Cross-Reference Everything

Validate information using:

  • Records
  • Site observations
  • Other interviews

4. Document Immediately

Record details as soon as possible to ensure accuracy.

5. Be Respectful of Privacy

Always prioritize confidentiality and professionalism.

Practical Example

Consider a property where:

  • Records show no environmental concerns
  • Site reconnaissance reveals no obvious issues

However, during neighbor interviews:

  • A long-term resident recalls:
    • A dry cleaning operation in the 1980s
    • Frequent chemical odors
    • A cleanup event that was never documented

This information could:

  • Indicate potential soil or groundwater contamination
  • Lead to identification of a REC
  • Trigger a Phase II ESA

Without neighbor interviews, this risk might remain undiscovered.

Importance in Environmental Due Diligence

Neighbor interviews enhance the Phase I ESA by:

  • Providing local, real-world insights
  • Identifying unrecorded environmental risks
  • Supporting a more comprehensive assessment

They are particularly valuable for:

  • Older properties
  • Mixed-use areas
  • Sites with limited historical records

Conclusion

Conducting interviews with neighbors is an important and valuable part of the Phase I ESA process.

By following best practices and aligning with standards such as ASTM E1527-21, environmental professionals can:

  • Enhance the completeness of their assessments
  • Identify risks that might otherwise be missed
  • Strengthen the defensibility of their conclusions

Key Takeaways

  • Neighbor interviews provide unique local knowledge
  • They help identify undocumented environmental risks
  • Participation is voluntary and must be handled professionally
  • Findings must be documented and integrated into the ESA report
  • Data gaps must be clearly identified

Final Thought

In many cases, the most valuable environmental insights come not from formal records, but from the people who have lived and worked near a property for years.

By taking the time to engage with neighbors, environmental professionals can uncover critical information that leads to better, more informed decisions—and ultimately, more reliable Phase I ESAs.

👉 Learn more about our Automated Environmental Site Assessment Solution

1 / ?