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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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