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HRS Rule, page 51621

Section 4.1.4.2.1.1, page 51621, last three bullets

  • If values for the selected AWQC, AALAC, or LC50 are available for both fresh water and marine water for the hazardous substance, use the value that corresponds to the type of water body (that is, fresh water or salt water) in which the sensitive environments are located to assign the ecosystem toxicity factor value to the hazardous substance.

  • If, however, some of the sensitive environments being evaluated are in fresh water and some are in salt water, or if any are in brackish water, use the value (fresh water or marine ) that yields the higher factor value to assign the ecosystem toxicity factor value to the hazardous substance.

  • If a value for the selected AWQC, AALAC, or LC50 is available for either fresh water or marine water, but not for both, use the available one to assign an ecosystem toxicity factor value to the hazardous substance.

    HRS Section 4.1.4.2.1.3, page 51622, last bullet

  • Use the BCF data that corresponds to the type of water body that is, fresh water or salt water) in which the sensitive environments (not fisheries) are located.

 

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