Rafat Abbasi, PE, and Mark Johnson will serve on the Expert Insights Panel, “Identifying Vapor Intrusion Issues During Due Diligence,” at the American Bar Association (ABA) Section of Environment, Energy, and Resources (SEER) 33rd Fall Conference.

They will speak on Friday, October 24, 2025, at 2:00 p.m. ET in Arlington, Virginia. Geosyntec is a platinum sponsor of the event.

Rafat is a Senior Consultant based in California with more than 35 years of experience focused on vapor intrusion and on remediation of manufacturing, commercial, agricultural, dry-cleaning, and military sites. As Chief of Site Mitigation and Brownfield Program at the California Environmental Protection Agency DTSC, he helped develop the RCRA Corrective Action program and more than two dozen vapor intrusion guidance documents.

Mark is a Senior Principal Consultant based in South Carolina with more than 29 years of experience focused on environmental, health, and safety (EHS) and environmental, social, and governance (ESG) merger and acquisition (M&A) transactions, environmental regulatory compliance, site investigation and remediation, and brownfield redevelopment planning and design.

The ABA is a membership organization that serves members, their profession, and the public by defending liberty and delivering justice as the national representative of the legal profession. Within the ABA, SEER supports a diverse community of environmental, energy, and resources lawyers, advisors, decision-makers, and students.

More Information

Learn more about the conference.
Learn more about ABA.
For more information on due diligence in vapor intrusion, contact Rafat at Rafat.Abbasi@Geosyntec.com or Mark at MJohnson@Geosyntec.com.
Learn more about Rafat: Rafat Abbasi
Learn more about Mark: Mark Johnson

Abstract

Thorough due diligence is the key ingredient for sweet success in acquisitions and redevelopment projects, especially when vapor intrusion (VI) risks are implicated early in the process. Overlooking VI during environmental site assessments can leave stakeholders hungry for answers and exposed to costly surprises. This lively, interactive session explores how careful investigation, from preliminary environmental due diligence to advanced VI data interpretation, helps uncover hidden risks and ensures informed decision-making from multiple stakeholder viewpoints, including buyers, sellers, regulators, and community groups. Everyone from law students to seasoned attorneys will learn how to spot red flags before they become liabilities, apply the latest research and regulatory approaches, and manage long-term effectiveness of mitigation systems and institutional controls. We’ll unwrap real-world lessons and proven methods for turning complex VI challenges into sweet opportunities—no tricks, just treats for those committed to smart and successful projects.