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 Sm3 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) |
1Within the range of 7.0 to 10.00 at all times.
| Maximum for any 1 day | Maximum for monthly average | Annual average1 | |
|---|---|---|---|
| (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) |
1kg/1,000 kkg (pounds per million pounds) of metal poured.
2These 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.
3Within 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) |
1Within the range of 7.0 to 10.0 at all times.
| Maximum for any 1 day | Maximum for monthly average | Annual average1 | |
|---|---|---|---|
| (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) |
1kg/1,000 kkg (pounds per million pounds) of metal poured.
2These 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.
3Within 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) |
1With the range of 7.0 to 10.0 at all times.
| Maximum for any 1 day | Maximum for monthly average | Annual average1 | |
|---|---|---|---|
| (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) |
1kg/1,000 kkg (pounds per million pounds) of metal poured.
2These 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.
3Within 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 Sm3 (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) |
1Within the range of 7.0 to 10.0 at all times.
| Maximum for any 1 day | Maximum for monthly average | Annual average1 | |
|---|---|---|---|
| (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) |
1kg/62.3 million SM3 (pounds per billion SCF) of air scrubbed.
2These 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.
3Within 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) |
1Within the range of 7.0 to 10.0 at all times.
| Maximum for any 1 day | Maximum for monthly average | Annual average1 | |
|---|---|---|---|
| (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) |
1kg/1,000 kkg (pounds per million pounds) of metal poured.
2These 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.
3Within 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 Sm3 (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) |
1Within the range of 7.0 to 10.0 at all times.
| Maximum for any 1 day | Maximum for monthly average | Annual average1 | |
|---|---|---|---|
| (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) |
1kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.
2These 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.
3Within 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) |
1Within the range of 7.0 to 10.0 at all times.
| Maximum for any 1 day | Maximum for monthly average | Annual average1 | |
|---|---|---|---|
| (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) |
1kg/1,000 kkg (pounds per million pounds) of metal
2These 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.
3Within the range of 7.0 to 10.0 at all times.
[50 FR 45247, Oct. 30, 1985; 51 FR 21760, June 16, 1986]
Tried the LawStack mobile app?
Join thousands and try LawStack mobile for FREE today.
- Carry the law offline, wherever you go.
- Download CFR, USC, rules, and state law to your mobile device.
