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Likelihood of Exposure

  • The threat to resident population is assessed by relating targets to areas of observed contamination.
    • Note the emphasis on the areas that are defined by the sampling points.
    • The sampling strategy for this threat is to assure that critical targets, as defined below, are picked up by the areas of observed contamination that are, in turn, defined by the sampling points.

  • The likelihood of exposure is assigned a value of 550 if any one of the following conditions is met. If not, the value is 0 and the resident population threat is not to be evaluated.

Section 5.1 page 51646 of HRS Rule

  • An area of observed contamination lies within the property boundary of a residence, school, or day care center and within 200 feet of the respective residence, school, or day care center
    • The "within 200" defines an area of about 3 acres. This provision excludes from consideration those situations where the property is large and the area of contamination is on the property but relatively far from the residence, school, or day care center. See Section N of the Preamble to the HRS, page 51560.
    • The 200-foot distance measurement is usually from the nearest part of the building but active playground areas have also been included for schools. Consult EPA for site-specific guidance.

  • An area of observed contamination lies within the workplace property boundary and within 200 feet of a workplace area.
    • The workplace area may be an outdoors area where normal activities may take workers. Document such a situation.

  • An area of observed contamination lies within a resource area or within a terrestrial sensitive environment.

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