New source performance standards.

Any new source subject to this subpart must achieve the following performance standards. The discharge of wastewater pollutants from the core shall not exceed the values set forth below: Subpart D Core Pollutant or pollutant property NSPS Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum forged Chromium 0.019 0.008 Cyanide 0.010 0.004 Zinc 0.051 0.021 Aluminum 0.305 0.135 Oil and grease 0.50 0.50 Suspended solids 0.75 0.60 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart D Forging Scrubber Liquor Pollutant or pollutant property NSPS Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum forged Chromium 0.035 0.014 Cyanide 0.019 0.008 Zinc 0.096 0.04 Aluminum 0.576 0.256 Oil and grease 0.943 0.95 Suspended solids 1.42 1.13 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart D Solution Heat Treatment Contact Cooling Water Pollutant or pollutant property NSPS Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum quenched Chromium 0.76 0.31 Cyanide 0.41 0.163 Zinc 2.08 0.86 Aluminum 12.45 5.52 Oil and grease 20.37 20.37 Suspended solids 30.56 24.45 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart D Cleaning or Etching Bath Pollutant or pollutant property NSPS Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.066 0.027 Cyanide 0.036 0.015 Zinc 0.183 0.075 Aluminum 1.094 0.485 Oil and grease 1.79 1.79 Suspended solids 2.69 2.15 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart D Cleaning or Etching Rinse Pollutant or pollutant property NSPS Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.52 0.21 Cyanide 0.28 0.11 Zinc 1.42 0.59 Aluminum 8.5 3.77 Oil and grease 13.91 13.91 Suspended solids 20.87 16.69 pH ( 1 ) ( 1 ) 1 Within the range of 7.0 to 10 at all times. Subpart D Cleaning or Etching Scrubber Liquor Pollutant or pollutant property NSPS Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.72 0.29 Cyanide 0.39 0.155 Zinc 1.97 0.812 Aluminum 11.81 5.24 Oil and grease 19.33 19.33 Suspended solids 29.00 23.20 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]