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 limitation and annual average mass limitation shall only apply to non-continuous dischargers. (a) Casting Cleaning 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) 0.0771 0.0421 Lead (T) 0.0791 0.039 Zinc (T) 0.114 0.0431 Oil & grease 3.0 1.0 TSS 3.80 1.50 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10.00 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 0.017 Lead (T) 0.79 0.39 0.022 Zinc (T) 1.14 0.43 0.027 Oil & grease 30 10 0.501 TSS 38 15 1.0 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 (12/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) 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) 0.0093 0.0051 Lead (T) 0.0096 0.0047 Zinc (T) 0.0138 0.0052 Oil & grease 0.363 0.121 TSS 0.46 0.182 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 0.0021 Lead (T) 0.79 0.39 0.0027 Zinc (T) 1.14 0.43 0.0033 Oil & grease 30 10 0.0605 TSS 38 15 0.121 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 (1.45/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) Die 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) 0.0066 0.0036 Lead (T) 0.0068 0.0034 Zinc (T) 0.0098 0.0037 Total Phenols 0.0074 0.0026 Oil & Grease 0.259 0.0864 TSS 0.33 0.13 pH ( 1 ) ( 1 ) 1 With 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 0.0015 Lead (T) 0.79 0.39 0.0019 Zinc (T) 1.14 0.43 0.0023 Total Phenols 0.86 0.3 0.0017 Oil & Grease 30 10 0.0432 TSS 38 15 0.0864 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 (1.04/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, (d) 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) 0.231 0.126 Lead (T) 0.237 0.117 Zinc (T) 0.343 0.129 Total Phenols 0.258 0.09 Oil & Grease 9.01 3.0 TSS 11.4 4.51 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 0.0511 Lead (T) 0.79 0.39 0.0661 Zinc (T) 1.14 0.43 0.0811 Total Phenols 0.86 0.3 0.0601 Oil & Grease 30 10 1.5 TSS 38 15 3.0 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 (0.036/x) where x is the actual normalized process waste-water 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. (e) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters. (f) 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. (g) 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) 3.01 1.64 Lead (T) 3.09 1.52 Zinc (T) 4.45 1.68 Total phenols 3.36 1.17 Oil and grease 117 39.1 TSS 148 58.6 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 0.664 Lead (T) 0.79 0.39 0.859 Zinc (T) 1.14 0.43 1.05 Total phenols 0.86 0.3 0.781 Oil and grease 30 10 19.5 TSS 38 15 39.1 pH ( 2 ) ( 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 (0.468/x) where x is the acutal 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. (h) 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) 0.297 0.162 Lead (T) 0.305 0.151 Zinc (T) 0.44 0.166 Oil and grease 11.6 3.86 TSS 14.7 5.79 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) 1 (mg/) 1 Copper (T) 0.77 0.42 0.0656 Lead (T) 0.79 0.39 0.0849 Zinc (T) 1.14 0.43 0.104 Oil and grease 30 10 1.93 TSS 38 15 3.86 pH ( 3 ) ( 3 ) ( 3 ) 1 kg/1,000 kkg (pounds per million pounds) of metal 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. 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]