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Which Chemicals at a Site Are Considered in the Evaluation?

In the pathways analysis section, we discussed how health assessors use comparison values to select which chemicals at a site need further evaluation. For a definition of comparison values, click on the term below.

Comparison values

Comparison values are guidelines that specify levels of chemicals in different environmental media (air, soil, and drinking water) that are considered safe for human contact. Chemicals found at levels above comparison values are selected for further evaluation.

Important Comparison values, however, cannot be used to predict whether someone will become ill from contacting a chemical. Comparison values are only used to decide which chemicals need further review.

From the list below, choose one comparison value that can be used to select chemicals for further evaluation.

Clean-up level

Environmental media evaluation guide (EMEG)

Diffusion rate

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One comparison value that can be used to select chemicals for further evaluation is an

checkmark environmental media evaluation guide (EMEG)

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