SUBTITLE C: WATER POLLUTION
CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
PART 352 PROCEDURES FOR DETERMINING WATER QUALITY BASED PERMIT LIMITATIONS FOR NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM DISCHARGERS TO THE LAKE MICHIGAN BASIN
SECTION 352.302 VALUES FOR 2,3,7,8-TCDD TOXICITY EQUIVALENCE CONCENTRATIONS
Section 352.302 Values for 2,3,7,8-TCDD Toxicity Equivalence Concentrations
a) For discharges in the Lake Michigan basin containing one or more 2,3,7,7,8-substituted chlorinated dibenzo-p-dioxins or 2,3,7,8-substituted dibenzofurans, the 2,3,7,8-TCDD toxicity equivalence concentration (TECTCDD) shall be determined as outlined in subsection (b).
b) The values listed in this Table 1 shall be used to determine the 2,3,7,8-TCDD toxicity equivalence concentrations using the following equation:
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TECTCDD |
= |
∑ |
Cx TEFxBEFx |
where:
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TEC TCDD |
= |
2,3,7,8-TCDD toxicity equivalence concentration in effluent |
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Cx |
= |
Concentration of total chemical x in effluent |
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TEFx |
= |
TCDD toxicity equivalency factor for x |
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BEFx |
= |
TCDD bioaccumulation equivalency factor for x |
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TABLE 1 |
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Congener |
TEF |
BEF |
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2,3,7,8-TCDD |
1.0 |
1.0 |
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1,2,3,7,8-PeCdd |
0.5 |
0.9 |
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1,2,3,4,7,8-HxCDD |
0.1 |
0.3 |
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1,2,3,6,7,8-HxCDD |
0.1 |
0.1 |
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1,2,3,7,8,9-HxCDD |
0.1 |
0.1 |
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1,2,3,4,6,7,8-HpCDD |
0.01 |
0.05 |
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OCDD |
0.001 |
0.01 |
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2,3,7,8-TCDF |
0.1 |
0.8 |
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1,2,3,7,8-PeCDF |
0.05 |
0.2 |
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2,3,4,7,8-PeCDF |
0.5 |
1.6 |
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1,2,3,4,7,8-HxCDF |
0.1 |
0.08 |
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1,2,3,6,7,8-HxCDF |
0.1 |
0.2 |
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2,3,4,6,7,8-HxCDF |
0.1 |
0.7 |
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1,2,3,7,8,9-HxCDF |
0.1 |
0.6 |
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1,2,3,4,6,7,8-HpCDF |
0.01 |
0.01 |
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1,2,3,4,7,8,9-HpCDF |
0.01 |
0.4 |
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OCDF |
0.001 |
0.02 |