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

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 for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT): (a) Rolling spent emulsions. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth rolled with emulsions Antimony 0.068 0.030 Lead 0.010 0.005 Oil and grease 0.468 0.281 TSS 0.960 0.457 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (b) Rolling spent soap solutions. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pound) of lead-tin-bismuth rolled with soap solutions Antimony 0.125 0.055 Lead 0.019 0.009 Oil and grease 0.860 0.520 TSS 1.80 0.840 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (c) Drawing spent neat oils—subpart A—BPT. There shall be no discharge of process wastewater pollutants. (d) Drawing spent emulsions. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth drawn with emulsions Antimony 0.076 0.034 Lead 0.011 0.005 Oil and grease 0.526 0.316 TSS 1.08 0.513 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (e) Drawing spent soap solutions. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth drawn with soap solutions Antimony 0.022 0.010 Lead 0.003 0.002 Oil and grease 0.149 0.090 TSS 0.306 0.146 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (f) Extrusion press and solution heat treatment contact cooling water. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds of lead-tin-bismuth heat treated Antimony 4.14 1.850 Lead 0.605 0.288 Oil and grease 28.80 17.30 TSS 59.10 28.10 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (g) Extrusion press hydraulic fluid leakage. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth extruded Antimony 0.158 0.071 Lead 0.023 0.011 Oil and grease 1.10 0.660 TSS 2.26 1.07 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (h) Continuous strip casting contact cooling water. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth cast by the continuous strip method Antimony 0.003 0.001 Lead 0.0004 0.0002 Oil and grease 0.020 0.012 TSS 0.041 0.020 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (i) Semi-continuous ingot casting contact cooling water. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth ingot cast by the sem-continuous method Antimony 0.085 0.038 Lead 0.013 0.006 Oil and grease 0.588 0.353 TSS 1.21 0.574 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (j) Shot casting contact cooling water. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth shot cast Antimony 0.107 0.048 Lead 0.016 0.008 Oil and grease 0.746 0.448 TSS 1.53 0.728 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (k) Shot-forming wet air pollution control scrubber blowdown. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth shot formed Antimony 1.69 0.753 Lead 0.247 0.118 Oil and grease 11.8 7.06 TSS 24.1 11.5 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (l) Alkaline cleaning spent baths. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth alkaline cleaned Antimony 0.345 0.154 Lead 0.051 0.024 Oil and grease 2.40 1.44 TSS 4.92 2.34 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (m) Alkaline cleaning rinse. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth alkaline cleaned Antimony 6.78 3.02 Lead 0.991 0.472 Oil and grease 47.2 28.4 TSS 96.8 46.0 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (n) Swaging spent emulsions. Subpart A—BPT Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of lead-tin-bismuth swaged with emulsion Antimony 0.005 0.002 Lead 0.0007 0.0004 Oil and grease 0.036 0.022 TSS 0.073 0.034 pH ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (o) Degreasing spent solvents—subpart A—BPT. There shall be no discharge of process wastewater pollutants. [50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]