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:


October 28, 2021, 12 - 1 PM EDT
Rapid and Effective Characterization of Building Susceptibility to Vapor Intrusion with Building Pressure Control

Building pressure control (BPC) offers a means of quickly characterizing building susceptibility to vapor intrusion (VI), reducing uncertainties caused by spatial and temporal variability of indoor air data and strengthening risk management decisions. BPC uses blower doors to depressurize buildings to various levels, enhancing VI, and then pressurize buildings, inhibiting VI, while concurrently measuring indoor air contaminant concentrations and physical parameters like cross-slab and cross-building pressure differentials. The difference between contaminant concentrations measured under depressurized and pressurized conditions represents the vapor intrusion contribution to indoor air. The depressurized conditions created by BPC minimize the need for multi-season sampling to address temporal variability in indoor air concentrations; indoor air concentrations measured under depressurized conditions vary substantially less than indoor air concentrations measured under baseline conditions.

This presentation focuses on how physical and chemical data collected through BPC at sites can be used to characterize the range of potential impacts that may arise from VI under the typical operating (baseline) conditions of the building. The second part of the presentation will include how the technique was adapted to work within Michigan's regulatory framework through the development of a standard operating procedure (SOP).

Presenter: Bryan VanDuinen, P.E.(MI) and Theresa Gabris, P.G. (VA), Geosyntec

December 2, 2021,  12 - 1 PM EST
Groundwater Modeling for Non-Modelers

Groundwater models are often useful tools in the environmental and hydrogeology fields. Groundwater modeling is a specialized skill, and this webinar will provide the basics of groundwater modeling for non-modelers to better understand what a "groundwater model" means, when (and when not!) to use a groundwater model, data needed to build a groundwater model, what important questions to ask when reviewing a groundwater model, and how groundwater models can be responsibly applied to problems of environmental compliance. This webinar was developed in collaboration with Barr Engineering Co. and the Michigan Department of Environment, Great Lakes, and Energy to provide a look into groundwater modeling from both the consulting and regulatory perspectives.

Presenters: Katy Lindstrom, Barr Engineering and Chris Christensen, EGLE Remediation and Redevelopment Division

Katy Lindstrom is a senior environmental engineer at Barr Engineering Co. and has over 13 years of experience in environmental consulting. She obtained her master's degree in Hydrologic Science and Engineering from the Colorado School of Mines and uses her background in hydrogeology and groundwater modeling to help clients assess and remediate contaminated sites, achieve environmental compliance, and address groundwater management issues.

Chris Christensen is an Environmental Hydrogeologist with the Michigan Department of Environment, Great Lakes and Energy, Remediation and Redevelopment Division, in Grand Rapids since 1992. Chris works on both Leaking Underground Storage Tank sites as well as chlorinated solvent and surficial soil contamination sites. He is on Technical Teams related to Incremental Sampling, Non Aqueous Phase Liquids, Risk-based Corrective Action and Groundwater Modeling. Chris has a BS in Geology from Michigan State University and a MS in Hydrogeology from Western Michigan University.


Recorded webinars in this series:


EPA's National and Regional Actions to Address PFAS (recorded 9/29/21, 61 min)

EPA's core mission is to protect human health and the environment by ensuring Americans have clean air, clean water, and safe healthy land. Addressing PFAS chemicals is at the heart of these efforts. Please join this month's webinar series to hear about EPA's most recent actions to address PFAS nationally and within the Great Lakes Region. Actions covered will include regulatory development, research, laboratory method development and activities in the Great Lakes Region.

Presenter: Kim Harris, Region 5 Multi-Media PFAS Advisor, USEPA-Region 5/Water Division


PFAS in Stormwater: Treatability and Implications of Emerging Water Quality Standards for Stormwater Dischargers (recorded 7/29/21, 61 min)

This presentation provides an update on the state-of-the-practice for Per- and Polyfluoroalkyl Substances (PFAS) in urban and industrial stormwater, including its abundances, its treatability and implications for source control, and implications for industrial and municipal stormwater dischargers.  A summary of available Interstate Technology and Regulatory Council PFAS guidance is provided with a focus on the state of the science/practice, a summary of what we know (occurrence, fate, transport and toxicology of some PFAS), what we want to know (the same for more PFAS, performance of conventional natural/passive stormwater treatment best management practices (BMP), potential for new treatment methods), and what we don't know (assessment of alternatives to PFAS, the long-term community and ecosystem effects, or the effectiveness of source controls at industrial facilities).  A State of Michigan perspective will also be provided, detailing how the Michigan PFAS Action Response Team is leading initiatives to help manage risks from PFAS in stormwater.

The session includes lessons learned from Geosyntec's recent PFAS stormwater source control and treatment projects.  In addition to applied research, our team has identified source controls and pilot testing or BMP planning at multiple confidential sites with PFAS-impacted stormwater. 

Acute Vapor Hazards from Petroleum Releases under Part 213 in Michigan (recorded 6/24/2021, 121 min)

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.

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.