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Monitored Natural Attenuation: Appropriate Tool or Easy Way Out? (Workshop)

Tuesday, September 27, 2016
Radisson Hotel and Suites
10 Independence Drive
Chelmsford, MA
Wednesday, September 28, 2016
Quinebaug Valley Community College
742 Upper Maple Street
Danielson, CT

Presenters: Chuck Newell and Dave Adamson, GSI Environmental, Inc.
Click Here for a copy of their presentation

Plus Petroleum Vapor Intrusion and MNA, Dr. Eric Suuberg, Brown University

9:00 to 9:30

Check-in and Continental Breakfast

9:30 to 9:40

Welcome and Introductions

9:40 to 10:30

Introduction:  Changing Paradigms and MNA Principles

  • History of groundwater remediation, two paradigm shifts
  • When/why MNA is important
  • Three lines of evidence

10:30 to 10:45

Networking Break

10:45 to 12:00

Key Attenuation Processes

  • Biodegradation processes: aerobic reactions, cometabolism, reductive dechlorination, and limiting factors on attenuation processes
  • Abiotic processes: Hydrolysis, reactive mineral degradation
  • LNAPL source zones degradation processes
  • Other MNA Processes (immobilization, storage, dilution)

12:00 to 12:45

Lunch (provided)

12:45 to 1:45

Field Techniques and Technologies:

  • Groundwater sampling and analytical methods
  • Key technologies:  Isotopes, Molecular tools
  • Natural Source Zone Depletion measurement methods at hydrocarbon sites

1:45 to 2:45

Should MNA be Used?  Data Analysis and Modeling Tools

  • Data requirements, long-term monitoring, and statistics required to understand MNA attenuation rates
  • Common graphics and calculations
  • Remediation timeframe calculations
  • Computer models to compare MNA vs. active remediation, sensitivity analysis

2:45 to 3:00

Networking Break

3:00 to 4:15

Implementation Topics

  • Comparing your site to other chlorinated MNA sites with BIOPIC
  • MNA for emerging contaminants (dioxane, PFAS), and metals
  • Best practices for dry cleaner sites - considerations for MNA at smaller sites
  • Which sites are well suited for MNA including considerations for site characteristics and MNA rates vs. plume migration
  • Low Threat Closure with MNA – the California experience
  • When to transition to MNA or enhanced MNA
  • Vapor intrusion and MNA (Dr. Eric Suuberg, Brown University)

4:15 to 4:30

Wrap Up and Q&A


For more information, contact Jennifer Griffith at .



Last Modified 06/30/2021

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