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Travel Distance for Nearby Targets

  • Travel distance in categories of less than 0 to 1/4 mile, less than 1/4 mile to 1/2 mile, and less than 1/2 mile to 1 mile must be mapped so that targets can be properly distance-weighted. This mapping may vary from the distance rings for the ground water or air pathways in two ways:

    • Distance is measured from areas of observed contamination with an attractiveness/accessibility factor value greater than 0 rather than from HRS sources with containment values greater than 0.

    • If there is a natural barrier to travel such as a river, distance is measured via the nearest crossing rather than straight line between the source and the target.

Guidance Manual, Highlight 9-22, page 393: Establishing Target Distance Categories for Nearby Threat: Method 1

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