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

September 27, 2016 @ 9:00 am - 4:30 pm

Presenters: Chuck Newell and Dave Adamson, GSI Environmental, Inc.
View 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


September 27, 2016
9:00 am - 4:30 pm
Event Category:


Radisson Hotel and Suites Chelmsford
10 Independence Drive
Chelmsford, MA United States
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