§ 464.23 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
Current through Aug 22, 2025 · Read all of Part 464
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 discharges, 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.
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) | 0.0307 | .0168 |
| Lead (T) | 0.0211 | .0104 |
| Zinc (T) | 0.0303 | .0116 |
| 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) | 0.53 | 0.26 | 0.006 |
| Zinc (T) | 0.76 | 0.29 | 0.0072 |
1 kg/1,000 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 waste-water flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(b) Direct Chill 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) | 0.928 | 0.506 |
| Lead (T) | 0.639 | 0.314 |
| Zinc (T) | 0.916 | 0.35 |
| 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) | 0.53 | 0.26 | 0.181 |
| Zinc (T) | 0.76 | 0.29 | 0.217 |
1 kg/1,000 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 waste-water flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(c) 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) | 0.553 | 0.301 |
| Lead (T) | 0.38 | 0.187 |
| Zinc (T) | 0.545 | 0.208 |
| Total phenols | 0.617 | 0.215 |
| 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) | 0.53 | 0.26 | 0.108 |
| Zinc (T) | 0.76 | 0.29 | 0.129 |
| Total phenols | 0.86 | 0.3 | 0.144 |
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.
(d) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters.
(e) Investment Casting.
BAT Effluent Limitations
| 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) | 8.48 | 4.63 |
| Lead (T) | 5.84 | 2.86 |
| Zinc (T) | 8.37 | 3.19 |
| 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) | 0.53 | 0.26 | 1.65 |
| Zinc (T) | 0.76 | 0.29 | 1.98 |
1 kg/1000 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.
(f) 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) | 1.81 | 0.988 |
| Lead (T) | 1.25 | 0.612 |
| Zinc (T) | 1.79 | 0.673 |
| Total phenols | 2.02 | 0.706 |
| 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) | 0.53 | 0.26 | 0.353 |
| Zinc (T) | 0.76 | 0.29 | 0.424 |
| Total phenols | 0.86 | 0.3 | 0.471 |
1 kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed.
2 These concentrations must be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(g) 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) | 0.392 | 0.214 |
| Lead (T) | 0.27 | 0.132 |
| Zinc (T) | 0.387 | 0.148 |
| 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) | 0.53 | 0.26 | 0.0763 |
| Zinc (T) | 0.76 | 0.29 | 0.0916 |
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.
[50 FR 45247, Oct. 30, 1985; 51 FR 21761, June 16, 1986]