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Waste Characteristics

  • Evaluate only those quantities that are in a source with a ground water containment value greater than 1. Evaluate only those substances that are found in such a source or are found in an observed release to ground water.

  • In the evaluation of the most hazardous substance for each of the three threats, multiply into the evaluation the ground water mobility value for the substance. In other words, the most hazardous substance must be both mobile in ground water and persistent in surface water.
    • The impact of this difference is that it usually reduces the value for waste characteristics unless the ground water mobility value for the most hazardous substance is 1.
    • Note that substances that have high values for surface water persistence and bioaccumulation usually tend to sorb and, therefore, receive a low value for ground water mobility unless they are found in an observed release to ground water. Conversely, substances that are highly toxic and mobile in ground water frequently have low surface water persistence and bioaccumulation potential.

  • Example:
Substance Toxicity Mobility Persistence BPFV
PCBs 10,000 0.0001 1 50,000
Vinyl Chloride 10,000 1 0.07 (lake) 5.0

  • In the evaluation of persistence, the predominant water body type is based on the PPE for the ground water to surface water component.

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