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HRS rule, page 51617, Section 4.1.3.2.1.3

4.1.3.2.1.3 Bioaccumulation potential.

Use the following data heirarchy to assign a bioaccumulation potential factor value to each hazardous substance:

  • Bioconcentration factor (BCF) data.

  • Logarithm of the n-octanol-water partition coefficient (log Kow) data.

  • Water solubility data.

Assign a bioaccumulation potential factor value to each hazardous substance from Table 4-15.

If BCF data are available for any aquatic human food chain organism for the substance being evaluated, assign the bioaccumulation potential factor value to the hazardous substance as follows:

  • If BCF data are available for both fresh water and salt water for the hazardous substance, use the BCF data that correspond to the type of water body (that is, fresh water or salt water) in which the fisheries are located to assign the bioaccumulation potential factor value to the hazardous substance.

  • If, however, some of the fisheries being evaluated are in fresh water and some are in salt water, or if any are in brackish water, use the BCF data that yield the higher factor value to assign the bioaccumulation potential factor value to the hazardous substance.

  • If BCF data are available for either fresh water or salt water, but not for both, use the available BCF data to assign the bioaccumulation potential factor value to the hazardous substance.

If BCF data are not available for the hazardous substance, use log Kow data to assign a bioaccumulation potential factor value to organic substances, but not to inorganic substances. If BCF data are not available, and if either log Kow data are not available, the log Kow is available but exceeds 6.0, or the substance is an inorganic substance, use water solubility data to assign a bioaccumulation potential factor value.

Table 4-15. Bioaccumulation Potential Factor Values a

If bioconcentration factor (BCF) data are available for any aquatic human food chain organism, assign a value as follows: b

BCF Assigned Value
Greater than or equal to 10,000 50,000
1,000 to less than 10,000 5,000
100 to less than 1,000 500
10 to less than 100 50
1 to less than 10 5
Less than 1 0.5


If BCF data are not available, and log Kow data are available and do not exceed 6.0, assign a value to an organic hazardous substance as follows (for inorganic hazardous substances, skip this step and proceed to the next):

Log Kow Assigned Value
5.5 to 6.0 50,000
4.5 to less than 5.5 5,000
3.2 to less than 4.5 500
2.0 to less than 3.2 50
0.8 to less than 2.0 5
less than 0.8 0.5


If BCF data are not available, and if either log Kow data are not available, a log Kow is available but exceeds 6.0, or the substance is an inorganic substance, assign a value as follows:

Water solubility (mg/l) Assigned value
Less than 25 50,000
25 to 500 5,000
Greater than 500 to 1,500 500
Greater than 1,500 0.5

If none of these data are available, assign a value of 0.5

a Do not round to nearest integer.

b See text for use of freshwater and saltwater BCF data.

Do not distinguish between fresh water and salt water in assigning the bioaccumulation potential factor value based on log Kow or water solubility data.

If none of these data are available, assign the hazardous substance a bioaccumulation potential factor value of 0.5.

 

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