Remediation and Risk Management Series



The Michigan Department of Environment, Great Lakes, and Energy (EGLE), in partnership with the American Institute of Professional Geologists (AIPG), and the Michigan Association of Environmental Professionals, is excited to launch the new Remediation and Risk Management Series. This webinar series is dedicated to helping environmental professionals stay informed about issues and trends that affect remediation and risk management efforts. Each month, EGLE will host a one-hour webinar that will tackle a topic of interest to environmental professionals and others interested in environmental remediation and risk management. Each webinar will include a presentation by a diverse selection of environmental professionals and allow time for questions from attendees. 

More webinars will be added throughout the year. 

Each webinar qualifies for 1 CEH/PDH.


Michigan Department of Environment, Great Lakes, and Energy (EGLE) logoMichigan Association of Environmental Professionals logo  Air & Waste Management Association logoAmerican Institute of Professional Geologists - Michigan Section logo

Upcoming webinars in this series:

Thu, Jun 24, 2021 12 PM - 2 PM EDT
Acute Vapor Hazards from Petroleum Releases under Part 213 in Michigan

Michigan's leaking underground storage tank regulation (Part 213) requires that upon confirmation of a release from an underground storage tank system a person must identify and mitigate acute vapor hazards (Section 21307).  To address this, EGLE has prepared an addendum to the 2013 Vapor Intrusion Guidance Document on how to identify acute vapor hazards. The addendum provides information for persons required to address releases under Part 213 regarding the identification, investigation, and evaluation that EGLE will find acceptable to satisfy the requirements consistent with Section 21307.

This talk will review the recent addendum that discusses the requirements and outlines the process that allows a party to:

  1. identify acute vapor hazards,
  2. assesses the need to mitigate using representative vapor sampling data, and
  3. establish a successful demonstration that mitigation is not warranted.

Case studies will be presented as well as a discussion on EGLE reviews and when the reviews occur as part of the Part 213 audit process.

Thu, October 28, 2021, 12 - 1:30PM EDT
Why Your Vapor Mitigation System Doesn't Have to Suck

Vapor mitigation systems are commonly designed to create a measurable vacuum below the slab of a building that meets or exceeds a value specified by a standard or guidance document. That is, they are designed to suck the gas out from under a building.  The generation of this vacuum also imparts some level of ventilation of the sub-slab soils beneath the slab, which reduces vapor concentrations and achieves some level of mass removal.  While current industry practices most often specify the level of static vacuum required, the amount of ventilation required is often not specified or evaluated.  This presentation will focus on new lines of evidence that warrant changes in the standard of practice for the design of vapor mitigation systems.  The presentation will show how the permeability of the sub-slab material and the transmissivity will impact the vacuum and ventilation beneath a building during sub-slab depressurization.  New evidence will be provided to support this approach.  Tools will also be discussed for measuring these factors and evaluating the performance of a mitigation system not solely based on an applied vacuum metric. 

Paul Nicholson headshot

Presenter: Paul Nicholson is an engineer and senior member of Geosyntec's vapor intrusion practice. He has over 15 years of experience in environmental consulting, vapor intrusion assessment, vapor intrusion mitigation design and construction. As one of the developers of the High Volume Sampling methods, Paul's current focus is on the design and optimization of sub-slab mitigation systems based on over a decade of research in this area.



Recorded webinars in this series:


Michigan PFAS Action Response Team Update  (recorded 5/27/2021, 62 min)

Join us to find out the latest news on the many PFAS investigations and research being done in Michigan for this emerging contaminant. Since the creation of the Michigan PFAS Action Response Team (MPART) in 2017, Michigan has collected and analyzed samples from 160+ PFAS sites, all of the municipal drinking water supplies in the state, biosolids, municipal waste water, landfills, crops, surface water, and fish and wildlife.

Attendees should expect to hear about MPART's collaborative efforts to address PFAS using a multi-agency team to investigate and work towards solutions.  This collaborative effort has not only focused the work of 7 different departments but has also created opportunities for collaboration with citizen groups, industry, and other governmental agencies outside of Michigan. The new MPART Executive Director will discuss the teams efforts on a variety of topics.

Presenter:  Abigail Hendershott, Executive Director, Michigan PFAS Action Response Team - Abigail (Abby) Hendershott is a nearly 30-year veteran of the Michigan Department of Environment, Great Lakes, and Energy (EGLE). She currently heads up the state's multi-agency taskforce investigating PFAS contamination and implementing clean-up and other response activities aimed at protecting Michigander's drinking water.  Hendershott has focused on PFAS response activities since 2017 and led the team responsible for Michigan's largest PFAS contamination response to-date, the investigation into the former Wolverine Worldwide tannery in Rockford. In that role, her team was responsible for the legal settlement establishing clean-up plans and municipal water connections for thousands of residents in northern Kent County with a total cost of $113 million.

Hendershott also advises on statewide PFAS investigations as the leader of the MPART groundwater workgroup and as a key member of the MPART technical advisory committee. Hendershott was formerly district supervisor for EGLE's Grand Rapids district office where she spent five years heading up the office's remediation and redevelopment division. Hendershott has more than 29 years of project management experience for complex Part 213 and Part 201 state funded remediation projects and has overseen multiple private party cleanup efforts.

Hendershott also has extensive experience in vapor intrusion, serving as team leader for the proposed Part 201 cleanup criteria rules, team leader for the vapor intrusion technical and program support team, and as the primary contact for vapor intrusion investigations handled by the Grand Rapids district office. 



2020 Volatilization to Indoor Air Pathway Screening Levels (recorded 4/29/2021, 81 min)
In September 2020, the EGLE replaced the rescinded Appendix D.1 of the 2013 Guidance Document for the Vapor Intrusion Pathway - Volatilization to Indoor Air Pathway (VIAP) Screening Levels with Residential and Nonresidential VIAP Screening Level Tables. The VIAP screening levels are provided as a voluntary tool that may be used to determine that site conditions do not present a risk and allow a quick regulatory closure or that site conditions warrant a more site-specific evaluation, at common residential and nonresidential sites. This webinar will cover the purpose behind the VIAP screening levels, the basic exposure assumptions used in their development, what documentation is needed for their voluntary use, and their use.

Presenters: Shane Morrison, PhD; Erica Bays; and Melissa Yuvan, EGLE Remediation and Redevelopment Division


Contracting for Remediation Projects: The Michigan Experience (recorded 3/25/2021, 61 min)
Please join us for a webinar exploring state of Michigan contracts utilized for environmental remediation projects. This one-hour webinar will explore the history of state contracts for professional services; the indefinite-scope, indefinite-delivery (ISID) contracts; the ISID solicitation and selection processes; and case studies. Participants can expect to learn a brief history of contracting for professionals services at the state of Michigan; an overview of contracts currently used for environmental investigation, study, design, construction oversight, underground storage tank removal, and laboratory professional services; and case studies focused on contracting. Additional information will include a brief overview of the SIGMA Vendor Self Service (VSS) website.


Sadi Rayyan, P.E., is a licensed professional engineer and a project director with the Michigan Department of Technology, Management, and Budget (DTMB) - Design and Construction Division. Mr. Rayyan has been involved in planning and managing contracts for various programs and state projects at DTMB since 1997.

Kristi Zakrzewski, P.E., is a licensed professional engineer and project director with DTMB's Design and Construction Division.  She specializes in contracting, design, and construction of remedial strategies for sites regulated under Part 201 Environmental Remediation of NREPA and CERCLA.

Bridget Walsh, P.E., is a licensed professional engineer with the Michigan Department of Environment, Great Lakes, and Energy's (EGLE'S) Remediation and Redevelopment Division (RRD) and serves as RRD's contract administrator.

Nick Swiger, P.E., CPG, is an Environmental Engineering Specialist working for EGLE RRD out of the Cadillac District Office.  He has been working on site investigations, remediation, and contracting for over 19 years and currently administers the State-Wide Expanded Triage contract and the Design-Build Soil and Underground Storage Tank removal contact.


PFAS Hot Topics (recorded 2/25/2021, 61 min)

Part 1: PFAS Sampling: Results of a Cross-Contamination Study

Can per- and polyfluoroalkyl substances (PFAS) be transferred from common products used during sampling?  There is the potential for PFAS to be present in many products that are routinely used in the environmental field. This presentation will show the results of a study performed investigating the potential for cross-contamination from a number of commonly used products.  Knowing the types of PFAS that may leach off of a particular sampling material may also be helpful in the forensic evaluation of sample data.  Analytical results will be presented along with experimental observations and recommendations.

Part 2: Effects of Variable Analytical Parameter Suites on the Identification of PFAS Sources

Evaluation of the relative composition of individual PFAS compounds in surface water and groundwater samples can be an effective method to identify the source(s) of PFAS in these media.  The list of PFAS compounds that laboratories are able to detect and the list of analytes required by various regulatory agencies continues to expand.  As a result, the number of compounds that can be used to "fingerprint" samples is variable with time and with location.  Attendees will learn about the efficacy and limitations of using PFAS analytes as fingerprints for source identification and delineation.

Presenter: Elizabeth Denly serves as TRC's PFAS Group Program Director and is also the Quality Assurance & Chemistry Director responsible for development of quality assurance project plans, evaluation of PFAS analytical data, and creation of PFAS-specific SOPs for field sampling.


Conceptual Site Models 101 (recorded 1/27/2021, 60 min)

Conceptual site models (CSMs) are a written or pictorial representation of an environmental system and the biological, physical, and chemical processes that determine the transport of contaminants from sources through the environmental media to environmental receptors within the system. Learn what this means from a regulator's perspective and how CSMs play a role in the review of compliance submittals. The webinar will review CSM basics, as well as information and tools that may be available for CSM construction. Every contaminated site has a story to tell, so know your audience and write a great script.

Presenter:  Aaron Assmann is an Environmental Quality Analyst for the Remediation and Redevelopment Division in the Grand Rapids Office managing Part 201, 213, State Funded and Brownfield Sites/Facilities. Aaron attended Alma College (BS) and the University of Michigan (MS). Before joining EGLE in 2017, Aaron worked in the Alaskan oilfields as an Environmental Advisor.