Wis. Admin. Code Department of Natural Resources NR 106.115

Current through November 25, 2024

Section NR 106.115 - Additivity of dioxins and furans

The 2,3,7,8-TCDD toxicity equivalence concentration in effluent shall be used when developing waste load allocations and for purposes of establishing water quality based effluent limits.

(1)For the chlorinated dibenzo-p-dioxins (CDDs) listed in Tables 8 and 9 in ch. NR 105, the potential adverse additive effects of all dioxin (CDD) and chlorinated dibenzofuran (CDF) congeners in effluents shall be accounted for as specified in this section.

(2)The Toxicity Equivalency Factor (TEF) in Table 1 and Bioaccumulation Equivalency Factor (BEF) in Table 2 shall be used when calculating a 2,3,7,8-TCDD toxicity equivalence concentration in effluent to be used when implementing both human health noncancer and cancer criteria. The chemical concentration of each CDD and CDF in effluent shall be converted to a 2,3,7,8-TCDD toxicity equivalence concentration in effluent by using the following equation:

(TEC)_tcdd = S (C)_x (TEF)_x (BEF)_x

where:

(TEC)_tcdd = 2,3,7,8-TCDD toxicity equivalence concentration in effluent

(C)_x = concentration of total chemical x in effluent

(TEF)_x = TCDD toxicity equivalency factor for x from table 1

(BEF)_x = TCDD bioaccumulation equivalency factor for x from table 2

Table 1 Toxicity Equivalency Factor for CDDS and CDFs

Congener	TEF
2,3,7,8-TCDD	1.0
1,2,3,7,8-PeCDD .................	0.5
1,2,3,4,7,8-HxCDD ...............	0.1
1,2,3,6,7,8-HxCDD ...............	0.1
1,2,3,7,8,9-HxCDD ...............	0.1
1,2,3,4,6,7,8-HpCDD .............	0.01
OCDD .........................	0.001
2,3,7,8-TCDF ...................	0.1
1,2,3,7,8-PeCDF .................	0.05
2,3,4,7,8-PeCDF .................	0.5
1,2,3,4,7,8-HxCDF ...............	0.1
1,2,3,6,7,8-HxCDF ...............	0.1
2,3,4,6,7,8-HxCDF ...............	0.1
1,2,3,7,8,9-HxCDF ...............	0.1
1,2,3,4,6,7,8-HpCDF ..............	0.01
1,2,3,4,7,8,9-HpCDF ..............	0.01
OCDF ..........................	0.001

Table 2 Bioaccumulation Equivalency Factor for CDDs and CDFs

Congener	BEF
2,3,7,8-TCDD ...................	1.0
1,2,3,7,8-PeCDD .................	0.9
1,2,3,4,7,8-HxCDD ...............	0.3
1,2,3,6,7,8-HxCDD ...............	0.1
1,2,3,7,8,9-HxCDD ...............	0.1
1,2,3,4,6,7,8-HpCDD .............	0.05
OCDD .........................	0.01
2,3,7,8-TCDF ...................	0.8
1,2,3,7,8-PeCDF .................	0.2
2,3,4,7,8-PeCDF .................	1.6
1,2,3,4,7,8-HxCDF ...............	0.08
1,2,3,6,7,8-HxCDF ...............	0.2
2,3,4,6,7,8-HxCDF ...............	0.7
1,2,3,7,8,9-HxCDF ...............	0.6
1,2,3,4,6,7,8-HpCDF ..............	0.01
1,2,3,4,7,8,9-HpCDF ..............	0.4
OCDF ..........................	0.02

Wis. Admin. Code Department of Natural Resources NR 106.115

Cr. Register, August, 1997, No. 500, eff. 9-1-97; CR 03-050: renum. from NR 106.16 Register February 2004 No. 578, eff. 3-1-04; CR 09-123: am. (1) Register July 2010 No. 655, eff. 8-1-10.

Amended by, CR 15-085: am. Table 1 (title), Table 2 (title) Register August 2016 No. 728, eff. 9/1/2016