40 CFR 414.91: Toxic pollutant effluent limitations and standards for direct discharge point sources that use end-of-pipe biological treatment.

(a) Any point source subject to this subpart must achieve discharges not exceeding the quantity (mass) determined by multiplying the process wastewater flow subject to this subpart times the concentrations in the following table.

(b) In the case of chromium, copper, lead, nickel, zinc, and total cyanide, the discharge quantity (mass) shall be determined by multiplying the concentrations listed in the following table for these pollutants times the flow from metal-bearing waste streams for the metals and times the flow from cyanide bearing waste streams for total cyanide. The metal-bearing waste streams and cyanide-bearing waste streams are defined as those waste streams listed in appendix A of this part, plus any additional OCPSF process wastewater streams identified by the permitting authority on a case-by-case basis as metal or cyanide bearing based upon a determination that such streams contain significant amounts of the pollutants identified above. Any such streams designated as metal or cyanide bearing must be treated independently of other metal or cyanide bearing waste streams unless the permitting authority determines that the combination of such streams, prior to treatment, with the appendix A waste streams will result in substantial reduction of these pollutants. This determination must be based upon a review of relevant engineering, production, and sampling and analysis information.

Effluent characteristics Effluent limitations BAT and NSPS 1

Maximum for any one day Maximum for any monthly average

Acenaphthene 59 22

Acenaphthylene 59 22

Acrylonitrile 242 96

Anthracene 59 22

Benzene 136 37

Benzo(a)anthracene 59 22

3,4-Benzofluoranthene 61 23

Benzo(k)fluoranthene 59 22

Benzo(a)pyrene 61 23

Bis(2-ethylhexyl) phthalate 279 103

Carbon Tetrachloride 38 18

Chlorobenzene 28 15

Chloroethane 268 104

Chloroform 46 21

2-Chlorophenol 98 31

Chrysene 59 22

Di-n-butyl phthalate 57 27

1,2-Dichlorobenzene 163 77

1,3-Dichlorobenzene 44 31

1,4-Dichlorobenzene 28 15

1,1-Dichloroethane 59 22

1,2-Dichloroethane 211 68

1,1-Dichloroethylene 25 16

1,2-trans-Dichloroethylene 54 21

2,4-Dichlorophenol 112 39

1,2-Dichloropropane 230 153

1,3-Dichloropropylene 44 29

Diethyl phthalate 203 81

2,4-Dimethylphenol 36 18

Dimethyl phthalate 47 19

4,6-Dinitro-o-cresol 277 78

2,4-Dinitrophenol 123 71

2,4-Dinitrotoluene 285 113

2,6-Dinitrotoluene 641 255

Ethylbenzene 108 32

Fluoranthene 68 25

Fluorene 59 22

Hexachlorobenzene 28 15

Hexachlorobutadiene 49 20

Hexachloroethane 54 21

Methyl Chloride 190 86

Methylene Chloride 89 40

Naphthalene 59 22

Nitrobenzene 68 27

2-Nitrophenol 69 41

4-Nitrophenol 124 72

Phenanthrene 59 22

Phenol 26 15

Pyrene 67 25

Tetrachloroethylene 56 22

Toluene 80 26

Total Chromium 2,770 1,110

Total Copper 3,380 1,450

Total Cyanide 1,200 420

Total Lead 690 320

Total Nickel 3,980 1,690

Total Zinc 2 2,610 1,050

1,2,4-Trichlorobenzene 140 68

1,1,1-Trichloroethane 54 21

1,1,2-Trichloroethane 54 21

Trichloroethylene 54 21

Vinyl Chloride 268 104

1 All units are micrograms per liter.

2 Total Zinc for Rayon Fiber Manufacture that uses the viscose process and Acrylic Fiber Manufacture that uses the zinc chloride/solvent process is 6,796 µg/l and 3,325 µg/l for maximum for any one day and maximum for monthly average, respectively.