Effluent limitations 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 for the core operation and for the ancillary operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available: Subpart A Core With an Annealing Furnace Scrubber Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum rolled with neat oils Chromium 0.0360 0.0147 Cyanide 0.0237 0.0098 Zinc 0.119 0.0498 Aluminum 0.525 0.257 Oil and grease 1.634 0.980 Suspended solids 3.348 1.593 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart A Core Without an Annealing Furnace Scrubber Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum rolled with neat oils Chromium 0.0244 0.010 Cyanide 0.0161 0.0067 Zinc 0.0808 0.0338 Aluminum 0.356 0.174 Oil and grease 1.11 0.664 Suspended solids 2.27 1.079 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart A Continuous Sheet Casting Spent Lubricant Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum sheet cast by continuous methods Chromium 0.00086 0.00035 Cyanide 0.00057 0.00024 Zinc 0.0029 0.0012 Aluminum 0.0127 0.0063 Oil and grease 0.0393 0.0236 Suspended solids 0.0805 0.0383 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart A Solution Heat Treatment Contact Cooling Water Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum quenched Chromium 3.39 1.39 Cyanide 2.24 0.93 Zinc 11.25 4.70 Aluminum 49.55 24.66 Oil and grease 154.10 92.46 Suspended solids 315.91 150.25 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart A Cleaning or Etching Bath Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.079 0.032 Cyanide 0.052 0.022 Zinc 0.262 0.110 Aluminum 1.15 0.573 Oil and grease 3.58 2.15 Suspended solids 7.34 3.49 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart A Cleaning or Etching Rinse Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 6.12 2.51 Cyanide 4.04 1.67 Zinc 20.31 8.49 Aluminum 89.46 44.52 Oil and grease 278.24 166.95 Suspended solids 570.39 271.29 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart A Cleaning or Etching Scrubber Liquor Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 7.00 2.86 Cyanide 4.61 1.91 Zinc 23.22 9.70 Aluminum 102.24 50.88 Oil and grease 318.00 190.80 Suspended solids 651.90 310.05 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. [48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11632, Mar. 27, 1984]