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HRS Guidance Manual, Highlight 8-50, page 301

Level of Contamination Food Chain Individual Factor Value Population Factor Value Minimum Surface Water HWQ Factor ValueA
Level I Concentrations 50 10 x Level I Human Food Chain Population Value 100
Level II Concentrations 45 1 x Level II Human Food Chain Population Value 100
Potential Food Chain Contamination 0 to 20 — depends on dilution weight and whether there is an observed release 0.1 x Potential Human Food Chain Population Value x Dilution Weight 10

a Only applies if Tier A is not adequately determined.


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