Chemical s must be sufficiently volatile and toxic to pose inhalation risk via vapor intrusion from soil and groundwater sources. 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. This is determined by calculating the chemicals pure phase vapor concentration and the groundwater vapor concentration.
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