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.
-
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.
Guidance Manual, Highlight 9-22, page 393: Establishing Target Distance Categories for Nearby Threat: Method 1
[Slide 5 of 6] [Home] 
Superfund Help: Acronyms | Topics | Frequent Questions | Publications | Sitemap