MAEP Professional Development Meeting Presents . . .

May 22, 2024

VOLATILIZATION TO INDOOR AIR PATHWAY (VIAP)
Evaluation of a Dispersed Vapor Source in Urban Fill Under Part 201

Site owners, regulators, and consultants in Michigan have extensive experience with vapor intrusion (VI) and the volatilization to indoor air pathway (VIAP). However, a persistent challenge for developers and property owners lies in evaluating the potential for unacceptable risks associated with VIAP, particularly at sites featuring urban or historic fill. Historically, there has been a tendency to opt for the installation of presumptive mitigation systems rather than conducting an exhaustive investigative process to collect the data necessary to confirm the absence of unacceptable risks to human health through inhalation.

To address this challenge and align with Part 201 regulations, Michigan's Environment, Great Lakes, and Energy Remediation and Redevelopment Division (EGLE-RRD) have developed guidance outlining various options for soil sampling, soil gas sampling, and sub-slab soil gas sampling. These methods aim to determine whether there is a sufficient mass of dispersed contamination within the fill likely to produce vapors posing an unacceptable inhalation risk.

This talk will delve into the concept of Dispersed Vapor Source in Urban Fill Guidance, focusing on three distinct scenarios:

• Urban Fill less than or equal to 4’ Below Ground Surface (bgs),
• Urban Fill Existing Beneath a Current Building, and
• Urban Fill Greater Than 4’ bgs.

Furthermore, EGLE-RRD will provide insights into the new format of the Guidance Document for the Volatilization to the Indoor Air Pathway (VIAP), including the release and open comment period of Volume 4: Investigative Approach for the Petroleum Volatilization to the Indoor Air Pathway (VIAP) (link provided) as well as forthcoming volumes:

• Volume 1 – Volatilization to the Indoor Air Pathway (VIAP) Overview,
• Volume 2 – Investigation Methods for the Volatilization to the Indoor Air Pathway (VIAP),
• Volume 3 – Investigation Approach for Volatilization to the Indoor Air Pathway (VIAP),
• Volume 5 – Response Activity, and
• Volume 6 – Volatilization to the Indoor Air Criteria.

Evaluation of a Dispersed Vapor Source in Urban Fill under Part 201 Guidance Document.pdf

Matthew Williams is a volatilization to indoor air specialist specializing on mitigation strategies and vapor intrusion, serving as the Volatilization to Indoor Air Specialist at the Michigan Department of Environment, Great Lakes, and Energy Remediation and Redevelopment Division (EGLE-RRD). In this role, he spearheads the development and implementation of methodologies to investigate and assess the vapor intrusion pathway, ensuring the safety and well-being of indoor environments.

As a program specialist and technical lead for the Vapor Intrusion Technical Assistance and Support Team, Matt has led numerous stakeholder groups and authored pivotal guidance documents, papers, and standard operating procedures. His expertise extends to conducting extensive trainings and delivering talks on sampling methods, vapor intrusion, petroleum vapor intrusion, mitigation, and indoor air quality both nationally and internationally.

Noteworthy among his contributions is Matt's leadership role in the Interstate Technology & Regulatory Council (ITRC), where he served as a section leader for the Petroleum Vapor Intrusion: Fundamentals of Screening, Investigation, and Management training in 2014. He also co-led both classroom and internet-based training teams and served as a co-leader for ITRC’s Vapor Intrusion Mitigation Team. Currently, Matt plays a crucial role as a co-leader for ITRC’s ongoing update for vapor intrusion, overseeing a collaborative effort involving nearly 200 professionals across the United States.

Matt holds a Bachelor of Science degree in Geology from Central Michigan University, earned in 1993, laying the foundation for his distinguished career in environmental science and indoor air quality management.

Block Brewing Company
1140 S Michigan Ave
Howell, MI 48843

5:30 p.m. - 6:15 p.m. - Cocktail Reception

6:15 p.m. – 7:15 p.m. – Dinner

7:15 p.m. – 9:00 p.m. – Presentation Followed by Questions

A Great Big Thank You to our Event Sponsors!

A Great Big Thank You to our Student Sponsor!