Chemicals that are often linked to vapor intrusion include. Vinyl chloride 75 01 4 c 20 300 xylenes total c 1330 20 7 n 200 880 b levels are the lower value generated using a factor of 100x for carcinogens and a factor of 2x for noncarcinogens using the table a 4 health based values. Chemical s must be sufficiently volatile and toxic to pose inhalation risk via vapor intrusion from soil and groundwater sources.
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