TITLE 35: ENVIRONMENTAL PROTECTION
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:

 

TECTCDD

=

Cx TEFxBEFx

 

where:

 

TEC TCDD

=

2,3,7,8-TCDD toxicity equivalence concentration in effluent

 

 

 

Cx

=

Concentration of total chemical x in effluent

 

 

 

TEFx

=

TCDD toxicity equivalency factor for x

 

 

 

BEFx

=

TCDD bioaccumulation equivalency factor for x

 

TABLE 1

 

 

 

Congener

TEF

BEF

 

 

 

2,3,7,8-TCDD

1.0

1.0

1,2,3,7,8-PeCdd

0.5

0.9

1,2,3,4,7,8-HxCDD

0.1

0.3

1,2,3,6,7,8-HxCDD

0.1

0.1

1,2,3,7,8,9-HxCDD

0.1

0.1

1,2,3,4,6,7,8-HpCDD

0.01

0.05

OCDD

0.001

0.01

2,3,7,8-TCDF

0.1

0.8

1,2,3,7,8-PeCDF

0.05

0.2

2,3,4,7,8-PeCDF

0.5

1.6

1,2,3,4,7,8-HxCDF

0.1

0.08

1,2,3,6,7,8-HxCDF

0.1

0.2

2,3,4,6,7,8-HxCDF

0.1

0.7

1,2,3,7,8,9-HxCDF

0.1

0.6

1,2,3,4,6,7,8-HpCDF

0.01

0.01

1,2,3,4,7,8,9-HpCDF

0.01

0.4

OCDF

0.001

0.02