Effluent limitations representing the degree of effluent reduction attainable by the application of 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 technology currently available: Subpart E Core Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/per million off-lbs) of aluminum drawn with neat oils Chromium 0.022 0.0090 Cyanide 0.015 0.0050 Zinc 0.073 0.031 Aluminum 0.32 0.160 Oil and grease 0.97 0.598 Suspended solids 2.04 0.972 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart E Continuous Rod 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 rod cast Chromium 0.00086 0.00035 Cyanide 0.00057 0.00024 Zinc 0.00287 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 10.0 at all times. Subpart E Continuous Rod Casting 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 rod cast Chromium 0.684 0.28 Cyanide 0.451 0.187 Zinc 2.271 0.949 Aluminum 10.00 4.976 Oil and grease 31.10 18.66 Suspended solids 63.76 30.322 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart E 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 E 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 0.26 0.11 Aluminum 1.150 0.57 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 E 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 E 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 318.00 190.8 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 11633, 11635, Mar. 27, 1984]