Environmental Engineering Reference
In-Depth Information
Fig. 10.6
Generic vapor intrusion assessment approach
limited scope of work can be conducted to demonstrate this with sufficient confi-
dence. Even where a focused investigation may not be conclusive, it may still yield
valuable information for scoping subsequent phases.
If further investigation is justified, an appropriate first step would include char-
acterizing soil gas concentrations in proximity to the known or suspected sources
of vapors. If such a survey identifies concentrations of potential concern, addi-
tional activity may be appropriate to delineate the extent of soil vapors. However,
if source concentrations are too low to pose a concern for indoor air quality, the
scope of any further phases or confirmatory monitoring may be curtailed appropri-
ately, or the Risk Assessment even could be concluded. Source area investigations
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