Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available, except that non-continuous dischargers shall not be subject to the maximum day and maximum for monthly average mass (kg/1,000 kkg or lb/million lb of metal poured; kg/62.3 million Sm 3 or lb/billion SCF of air scrubbed) effluent limitations for copper, lead, zinc, total phenols, oil and grease, and TSS. For non-continuous dischargers, annual average mass limitations and maximum day and maximum for monthly average concentration (mg/l) limitations shall apply. Concentration limitations and annual average mass limitations shall only apply to non-continuous dischargers. (a) Casting Quench Operations. BPT Effluent Limitations 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) 0.0307 0.0168 Lead (T) 0.0315 0.0156 Zinc (T) 0.0455 0.0171 Oil and grease 1.2 0.399 TSS 1.52 0.598 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10.0 at all times. Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.0068 Lead (T) 0.79 0.39 0.0088 Zinc (T) 1.14 0.43 0.0108 Oil and grease 30 10 0.199 TSS 38 15 0.399 pH ( 3 ) ( 3 ) ( 3 ) 1 kg/1000 kkg (pounds per million pounds) of metal poured 2 These concentrations must be multiplied by the ratio of (4.8/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. 3 Within the range of 7.0 to 10.0 at all times. (b) Direct Chill Casting Operations. BPT Effluent Limitations 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) 0.952 0.47 Zinc (T) 1.37 0.518 Oil and grease 36.2 12.1 TSS 45.8 18.1 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10.0 at all times. Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.205 Lead (T) 0.79 0.39 0.265 Zinc (T) 1.14 0.43 0.326 Oil and grease 30 10 6.03 TSS 38 15 12.1 pH ( 3 ) ( 3 ) ( 3 ) 1 kg/1000 kkg (pounds per million pounds) of metal poured. 2 These concentrations must be multiplied by the ratio of (145/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. 3 Within the range of 7.0 to 10.0 at all times. (c) Dust Collection Scrubber Operations. BPT Effluent Limitations 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) 0.553 0.301 Lead (T) 0.567 0.28 Zinc (T) 0.818 0.309 Total phenols 0.617 0.215 Oil and grease 21.5 7.18 TSS 27.3 10.8 ph ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10.0 at all times. Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.122 Lead (T) 0.79 0.39 0.158 Zinc (T) 1.14 0.43 0.194 Total phenols 0.86 0.3 0.144 Oil and grease 30 10 3.59 TSS 38 15 7.18 pH ( 3 ) ( 3 ) ( 3 ) 1 kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed. 2 These concentrations must be multiplied by the ratio of (0.086/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant. 3 Within the range of 7.0 to 10.0 at all times. (d) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters. (e) Investment Casting. BPT Effluent Limitations 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) 8.7 4.3 Zinc (T) 12.6 4.74 Oil and grease 330 110 TSS 419 165 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10.0 at all times. Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 1.87 Lead (T) 0.79 0.39 2.42 Zinc (T) 1.14 0.43 2.97 Oil and grease 30 10 55.1 TSS 38 15 110 pH ( 3 ) ( 3 ) ( 3 ) 1 kg/1,000 kkg (pounds per million pounds) of metal poured. 2 These concentrations must be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. 3 Within the range of 7.0 to 10.0 at all times. (f) Melting Furnace Scrubber Operations. BPT Effluent Limitations 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) 1.81 0.988 Lead (T) 1.86 0.918 Zinc (T) 2.68 1.01 Total phenols 2.02 0.706 Oil and grease 70.6 23.5 TSS 89.4 35.3 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10.0 at all times. Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.4 Lead (T) 0.79 0.39 0.518 Zinc (T) 1.14 0.43 0.635 Total phenols 0.86 0.3 0.467 Oil and grease 30 10 11.8 TSS 38 15 23.5 pH ( 3 ) ( 3 ) ( 3 ) 1 kg/62.3 million Sm 3 (pound per billion SCF) of air scrubbed. 2 These concentrations must be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant. 3 Within the range of 7.0 to 10.0 at all times. (g) Mold Cooling Operations. BPT Effluent Limitations 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) 0.402 0.199 Zinc (T) 0.58 0.219 Oil and grease 15.3 5.09 TSS 19.3 7.63 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10.0 at all times. Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.0865 Lead (T) 0.79 0.39 0.112 Zinc (T) 1.14 0.43 0.137 Oil and grease 30 10 2.54 TSS 38 15 5.09 pH ( 3 ) ( 3 ) ( 3 ) 1 kg/1,000 kkg (pounds per million pounds) of metal poured. 2 These concentrations must be multiplied by the ratio of (61/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. 3 Within the range of 7.0 to 10.0 at all times. [50 FR 45247, Oct. 30, 1985; 51 FR 21760, June 16, 1986]