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

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