40 CFR 464.25: Pretreatment standards for existing sources.

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.

(a) Casting Quench Operations.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.0307 0.0168

Lead (T) 0.0211 0.0104

Zinc (T) 0.0303 0.0116

TTO 0.0335 0.0109

Oil and grease (for alternate monitoring) 1.2 0.399

(b) Direct Chill Casting Operations.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.928 0.506

Lead (T) 0.639 0.314

Zinc (T) 0.916 0.35

(c) Dust Collection Scrubber Operations.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed

Copper (T) 0.552 0.301

Lead (T) 0.38 0.187

Zinc (T) 0.545 0.208

Total phenols 0.617 0.215

TTO 1.65 0.54

Oil and grease (for alternate monitoring) 21.5 7.18

(d) Grinding Scrubber Operations. No discharge of process wastewater pollutants to a POTW.

(e) Investment Casting.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 8.48 4.63

Lead (T) 5.84 2.86

Zinc (T) 8.37 3.19

TTO 25.4 8.29

Oil and grease for alternate monitoring) 330 110

(f) Melting Furnace Scrubber Operations.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed

Copper (T) 1.81 0.988

Lead (T) 1.25 0.612

Zinc (T) 1.79 0.673

Total phenols 2.02 0.706

TTO 5.41 1.77

Oil and grease (for alternate monitoring) 70.6 23.5

(g) Mold Cooling Operations.

PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.392 0.214

Lead (T) 0.27 0.132

Zinc (T) 0.387 0.148

TTO 0.428 0.14

Oil and grease (for alternate monitoring) 15.3 5.09