Area of Observed Contamination
- The area of observed contamination is determined in the same manner as explained in Section 17 of this training.
From this area of observed contamination used for the resident population threat, two sub-areas are deleted for the nearby population threat.
- Areas with an attractiveness/accessibility value of 0 in HRS Table 5-6, namely "Physically inaccessible to the public, with no evidence of public recreation use." The HRS Guidance Manual gives the example of "Area off-limits to unauthorized personnel at guarded and fenced military base or industrial complexes." This exclusion is parallel to the exclusion of sources with a containment value of 0 in the migration pathways.
- Residential properties. These properties are excluded from evaluation for attractiveness/accessibility and, therefore, cannot have a value greater than 0.
These sub-areas are not evaluated for likelihood of exposure, waste characteristics, or travel distance for targets.
EXERCISE: What areas of observed contamination should be included for the nearby population threat? ANSWER
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