MTCA 101: Understanding and Applying Washington State's Model Toxics Control Act Course - Live Online Training

  • October 05, 2021
  • 8:30 AM
  • October 06, 2021
  • 5:00 PM
  • Live Online Training


  • 10 or more people
  • 2 to 9 people


October 5 - 6, 2021, 8:30 A.M. to 5 P.M. PDT (2 Days)
Pacific Time Zone

Live Interactive Online Training


Priscilla Tomlinson, Washington State Department of Ecology

Mike Ehlebracht, Hart Crowser, Inc.

Mark Gordon, Washington State Department of Ecology

Chris Waldron, Pioneer Technologies Corporation 

Kelsey Ketcheson, Washington State Department of Ecology

Brad Petrovich, Washington State Department of Ecology

Summary: This course provides a comprehensive overview and refresher of Washington State's Model Toxics Control Act (MTCA). MTCA directs the investigation and cleanup of contaminated sites in Washington. MTCA applies to contaminated soil, groundwater, air, and surface water in both freshwater and marine environments. The training begins with a general overview of MTCA and the site cleanup process. The course then moves on to topics related to applying MTCA to contaminated sites and achieving compliance. The instructors include MTCA experts from Washington State Department of Ecology and environmental consulting firms.

Course Topics

Overview of MTCA and the Cleanup Process

  • General Concepts

  • Definitions

  • Legal Mechanisms for Cleanup

  • "Sites" and "Hazardous Substances"

  • Resources (ISIS and What's in My Neighborhood)

Understanding the Site

  • Environmental Media

  • Exposure Pathway Evaluation

  • Receptor Identification

  • Terrestrial Ecological Evaluation Exclusions

  • Creating Conceptual Site Models Under MTCA

MTCA Cleanup Standards

  • Key Concepts
  • Methods A, B, and C

  • Process for Methods B and C

  • Terrestrial Ecological Evaluation (TEE)

  • Simple Compliance with Method A Soil Cleanup Levels (CULs) for Various Scenarios

  • Contiguous Undeveloped Land TEE

  • Leaching Pathway

  • Vapor Intrusion
  • Nonpotable Groundwater

  • Background Concentrations

  • Soil CULs for Various Scenarios

MTCA Cleanup Standards (cont.)

  • Adjusting a Maximum Contaminant Level (MCL)

  • Chemicals with Special Considerations

  • Common Errors

  • Resources

Remedy Selection

  • Feasibility Studies

  • Minimum Requirements for Cleanup (Thresholds, Etc.)

  • Site-Specific Requirements for Cleanup

  • Disproportionate Cost Analysis

  • Model Remedies

Public Participation

  • MTCA Requirements

  • Meaningful Public Involvement

  • Environmental Justice

  • Case Study: Public Involvement Considerations

Evaluation of Compliance

  • Points of Compliance

  • Determination of Compliance with Cleanup Levels
  • Institutional Controls

  • Periodic Reviews


Q&A and Case Studies Throughout the Course

Intended Audience: This course is intended for environmental consultants, agency staff, and others seeking an improved understanding of MTCA and its application to contaminated sites within Washington State.

Education Level: Introductory to intermediate, or refresher. General principles and more advanced topics are presented to ensure all levels benefit from attending.

Course Materials: Updated course proceedings including presentation slides and resources (PDF).

Credit: 15 PDHs or 1.5 CEUs for completing 15 hours of instruction.

Tuition: $395, $295 per person for small groups of 2 - 9 people on the same registration, and $195 per person for large groups of 10 or more on the same registration). Register online or by calling us at (800) 385-0783.

Location: Your home or office - anywhere you can get comfortable and online.

About the Instructors: 

Priscilla Tomlinson, Toxicologist, Washington State Department of Ecology

Mike Ehlebracht, Principal Geochemist, Hart Crowser, Inc.

Mark Gordon, Environmental Engineer, Washington State Department of Ecology 

Chris Waldron, Environmental Engineer, Pioneer Technologies Corporation

Kelsey Ketcheson, Outreach Specialist, Washington State Department of Ecology

Brad Petrovich, Outreach Specialist, Washington State Department of Ecology


Erick McWayne, Executive Director, National Environmental Management Academy

National Environmental Management Academy
Environmental Training Calendar

(800) 385-0783

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