Superfund

Waste Characteristics

All evaluations are restricted to sources with non-zero gas or particulate containment factor values and to substances associated with such sources.
Exclude any substance that is associated solely with a source or sources with both gas and particulate containment factor values of zero.

Toxicity

Obtain the toxicity factor value from SCDM for each hazardous substance associated with the site.
EPA should be consulted whenever values are needed for substances not appearing in SCDM.

Mobility

Gaseous substances associated with the site
- Assign a value of 1 for mobility for a gaseous substance found in an observed release by direct observation or by chemical analysis.
- Otherwise, obtain the gaseous mobility value from SCDM.
- EPA should be consulted whenever values are needed for substances not appearing in SCDM.
Particulate substances associated with the site
- Assign a value of 0.02 for a particulate substance found in an observed release.
- All other particulate substances are assigned the same particulate mobility value based on the location of the site using the particulate migration potential value.

Waste Characteristics

Select the most hazardous substance: the substance at the site with the highest product of toxicity times mobility.
Multiply toxicity/mobility by the value for the hazardous waste quantity for the air pathway.
This product is capped at 10⁸.
The waste characteristics value is obtained from HRS rule Table 2-7. The maximum value is 100.

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