NAPL REMEDIATION REQUIREMENTS
MAIN> SURVEY REPONSES> Question 5.2- What quantity of NAPL observed in the observation well triggers NAPL investigation/response actions?

The survey question was:

What quantity of NAPL observed in the observation well triggers NAPL investigation/response actions?
Sheen 1/8 inch thickness Other

Is NAPL removal to extent practicable required in all cases?

Yes No, only when certain risk factors apply Unknown

If extent of NAPL remediation depends on risk factors, identify applicable factors triggering need for NAPL response

NAPL discharge to ground surface or SW
Explosive vapor condition in subsurface utility of other structure
NAPL plume expanding in area
NAPL contributing to expansion of dissolved plume
Site-specific risk evaluation indicated need for NAPL response


The responses to this question are summarized below

Across the United States, the response was as follows:
(click on figures for a larger picture)

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