Monitored Natural Attenuation: Appropriate Tool or Easy Way Out?

Presenters: Chuck Newell and Dave Adamson, GSI Environmental, Inc.
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Plus Petroleum Vapor Intrusion and MNA, Dr. Eric Suuberg, Brown University

Agenda

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