NUMERICAL CONCENTRATION LIMITS
MAIN> SURVEY REPONSES>Question 4.2-Is an ecological risk assessment required as part of the site assessment or corrective action?

The survey question was:

Numerical concentration limits are determined based on which of the following factors? (check all that apply)

Background concentration
Analytical detection limits
Regulatory limit (e.g. MCL)
Risk-based calculation

For a groundwater classified as a drinking water resource:

MCL does not apply
MCL always applies, if available for the COC
Use lesser of MCL or site-specific value
Use greater of MCL or site-specific value

Concentration limits may change based on which of the following factors? (check all that apply)

Land use
Groundwater classification
Assessment Tier
Physical controls
Institutional controls

 

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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