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MNA Frequent Question 10. What are some potential disadvantages of MNA?
- Longer time frames may be required to achieve remediation objectives,
compared to active remediation measures at a given site;
- Site characterization is expected to be more complex and costly;
- Toxicity and/or mobility of transformation products may exceed that of the
parent compound;
- Long-term performance monitoring will generally be more extensive and
for a longer time;
- Institutional controls may be necessary to ensure long term protectiveness;
- Potential exists for continued contamination migration, and/or cross-media
transfer of contaminants;
- Hydrologic and geochemical conditions amenable to natural attenuation
may change over time and could result in renewed mobility of previously
stabilized contaminants (or naturally occurring metals), adversely impacting
remedial effectiveness; and
- More extensive education and outreach efforts may be required in order to
gain public acceptance of MNA.
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