Food Chain Population
HRS Table 4-18, page 51621 performs the cross-walk between pounds of edible tissue and the people-equivalents of this poundage. This table assumes a BPFV of 1, because bioaccumulation is considered in waste characteristics not targets.
Determine the poundage of edible tissue produced from each fishery within the target distance limit. Use HRS Table 4018, page 51621, to find the population value associated with each fishery.
Multiply the population value for each fishery at Level I and Level II by the appropriate multipliers. Enter the products on HRS Table 4-1, page 51608 (HRS Guidance Manual, Highlight 8-50 : Comparison of Scoring Level I, Level II, and Potential Contamination, page 301 for these multipliers).
For all of the fisheries at potential contamination, apply the HRS formula on page 51621 of the HRS rule.
- Note that the summation operator is applied to each
fishery, not to each dilution range. If there are two or more fisheries
within the same dilution range, treat each fishery individually. This
approach differs from the drinking water and environmental threats.
- Do not forget to apply the 1/10 for potential to the sum of the dilution-weighted population values for the potential fisheries. Enter the results on HRS Table 4-1 as the value for potential human food chain contamination.
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