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  • The PPE may not be the same as in the overland/flood component. This may change the set of targets that are picked up by the in-water segment.

  • The likelihood of release is the likelihood of release to ground water (the surficial aquifer), not surface water.

  • Waste characteristics is based on sources with a ground water contaminant value greater than 0 and included the consideration of ground water mobility as well as surface water persistence.

  • Actual contamination in the in-water segment requires that a substance be found in both an observed release to ground water and an observed release by chemical analysis to surface water.

  • The values for targets subject to potential contamination are reduced by a second dilution weight based on the angle theta.

  • Conclusion:
    • This component has proven useful at sites that are well-secured against overland/flood migration but are close to surface water and leaching hazardous substances into surface water.
    • Unless these conditions are met, this component will almost always score lower than the overland/flood migration component.
    • The evaluation of the two components, with the exceptions mentioned above, is essentially the same.

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