by Liberty Environmental

Redeveloping former industrial sites for residential use requires careful evaluation of vapor intrusion risks. There is a risk that volatile organic compounds (VOCs) were released into the subsurface at sites where dry cleaners were located, gas stations were operating, or where other industrial activity previously occurred. These prior uses pose significant potential health risks to future residents. Additionally, properties adjacent to sites that were once gas stations or utilized for industrial purposes may be impacted by migration of vapors from these sources, necessitating a thorough investigation before redevelopment.

What is Vapor Intrusion & How Can it Be Detected?

Vapor intrusion occurs when VOCs migrate from contaminated soil or groundwater into indoor air spaces. This pathway can expose residents to harmful chemicals, making it critical for redevelopers to perform due diligence. A comprehensive environmental site assessment should be conducted prior to any redevelopment to identify potential sources of contamination, including investigation into historical land use and neighboring properties with known releases. When a vapor intrusion risk is identified, sampling and analysis of soil gas and indoor air is performed to confirm the presence or absence of a vapor intrusion condition.

How Is Vapor Intrusion Mitigated?

If vapor intrusion is suspected, a detailed evaluation plan should be implemented. This includes soil gas sampling and indoor air testing to assess the extent of vapor migration. Based on the findings, appropriate mitigation strategies must be incorporated into the redevelopment design. These may include vapor barriers, sub-slab depressurization systems, and enhanced ventilation to prevent VOCs from entering living spaces.

State regulatory agencies provide guidance and oversight for vapor intrusion assessments and mitigation. Engaging environmental professionals and coordinating with state agencies ensures compliance and protects public health.

Why is Addressing Vapor Intrusion Important?

Addressing vapor intrusion is a vital component of residential redevelopment on or near former industrial sites. Proactive evaluation and mitigation not only safeguard future occupants but also facilitate successful and sustainable redevelopment projects.

Liberty Environmental’s talented team of professional engineers, geologists and licensed remediation professionals have proven experience testing for VOCs and implementing remediation for redevelopment projects. Contact us at info@libertyenviro.com to schedule a site assessment or speak with a member of our team to learn more.