Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

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 available technology economically achievable, 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, and total phenols. 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 Cleaning Operations. BAT 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) 0.0771 0.0421 Lead (T) 0.0791 0.039 Zinc (T) 0.114 0.0431 Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.017 Lead (T) 0.79 0.39 0.022 Zinc (T) 1.14 0.43 0.027 1 kg/1,000 kkg (pounds per million pounds) of metal poured. 2 These concentrations must be multiplied by the ratio of (12/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. (b) Casting Quench Operations. BAT 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) 0.0093 0.0051 Lead (T) 0.0096 0.0047 Zinc (T) 0.0138 0.0052 Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.0021 Lead (T) 0.79 0.39 0.0027 Zinc (T) 1.14 0.43 0.0033 1 kg/1,000 kkg (pounds per million pounds) of metal poured. 2 These concentrations must be multiplied by the ratio of (1.45/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. (c) Die Casting Operations. BAT 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) 0.0066 0.0036 Lead (T) 0.0068 0.0034 Zinc (T) 0.0098 0.0037 Total Phenols 0.0074 0.0026 Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.0015 Lead (T) 0.79 0.39 0.0019 Zinc (T) 1.14 0.43 0.0023 Total Phenols 0.86 0.3 0.0017 1 kg/1,000 kkg (pounds per million pounds) of metal poured. 2 These concentrations must be multiplied by the ratio of (1.04/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. (d) Dust Collection Scrubber Operations. BAT 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) 0.231 0.126 Lead (T) 0.237 0.117 Zinc (T) 0.343 0.129 Total Phenols 0.258 0.09 Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.0511 Lead (T) 0.79 0.39 0.0661 Zinc (T) 1.14 0.43 0.0811 Total Phenols 0.86 0.3 0.0601 1 kg/62.3 million Sm 3 (lb per billion SCF) of air scrubbed. 2 These concentrations must be multiplied by the ratio of (0.036/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant. (e) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters. (f) Investment Casting. BAT 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 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 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. (g) Melting Furnace Scrubber Operations. BAT 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) 3.01 1.64 Lead (T) 3.09 1.52 Zinc (T) 4.45 1.68 Total phenols 3.36 1.17 Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.664 Lead (T) 0.79 0.39 0.859 Zinc (T) 1.14 0.43 1.05 Total phenols 0.86 0.3 0.781 1 kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed 2 These concentrations must be multiplied by the ratio of (0.468/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant. (h) Mold Cooling Operations. BAT 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) 0.297 0.162 Lead (T) 0.305 0.151 Zinc (T) 0.44 0.166 Maximum for any 1 day Maximum for monthly average Annual average 1 (mg/l) 2 (mg/l) 2 Copper (T) 0.77 0.42 0.0656 Lead (T) 0.79 0.39 0.0849 Zinc (T) 1.14 0.43 0.104 1 kg/1,000 kkg (pounds per million pounds) of metal poured. 2 These concentrations must be multiplied by the ratio of (46.3/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant. [50 FR 45247, Oct. 30, 1985; 51 FR 21760, June 16, 1986]