The waste characteristics factor category in the ground water
pathway is made up of two components: the toxicity/mobility of
the most hazardous substance associated with the site and the
hazardous waste quantity at the site. The most hazardous
substance at a site is identified as the hazardous substance
receiving the highest toxicity/mobility value factor. The
hazardous waste quantity factor is evaluated as discussed in
Section 5. - The Most Hazardous Substance at a Site -
Toxicity/Mobility Factor - Hazardous Waste Quantity - Waste
Characteristics Factor Category Value The most hazardous
substance at a site is identified by calculating the
toxicity/mobility factor all eligible hazardous substances
associated with the site. Eligible hazardous substances consist
of those hazardous substances available to migrate from the
sources at the site to ground water and include: - All hazardous
substances found in ground water observed releases at the site.
- All hazardous substances found in a source with a non-zero gro