[Code of Federal Regulations] [Title 40, Volume 29] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR467.24] [Page 626-627] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 467_ALUMINUM FORMING POINT SOURCE CATEGORY--Table of Contents Subpart B_Rolling With Emulsions Subcategory Sec. 467.24 New source performance standards. Any new source subject to this subpart must achieve the following performance standards. The discharge of process wastewater pollutants from the core shall not exceed the values set forth below: Subpart B Core ------------------------------------------------------------------------ NSPS --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum rolled with emulsions --------------------------- Chromium.................................... 0.048 0.020 Cyanide..................................... 0.026 0.011 Zinc........................................ 0.133 0.055 Aluminum.................................... 0.80 0.35 Oil and grease.............................. 1.30 1.30 Suspended solids............................ 1.95 1.56 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.0 to 10.0 at all times. Subpart B Direct Chill Casting Contact Cooling Water ------------------------------------------------------------------------ NSPS --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum cast by semicontinuous methods --------------------------- Chromium.................................... 0.49 0.20 Cyanide..................................... 0.27 0.11 Zinc........................................ 1.36 0.56 Aluminum.................................... 8.12 3.60 Oil and grease.............................. 13.29 13.29 Suspended solids............................ 19.94 15.95 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ The pH shall be maintained within the range of 7.0 to 10.0 at all times except for those situations when this waste stream is discharged separately and without commingling with any other wastewater in which case the pH shall be within the range of 6.0 to 10.0 at all times. [[Page 627]] Subpart B Solution Heat Treatment Contact Cooling Water ------------------------------------------------------------------------ NSPS --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum quenched --------------------------- Chromium.................................... 0.76 0.31 Cyanide..................................... 0.41 0.17 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 10.0 at all times. Subpart B Cleaning or Etching Bath ------------------------------------------------------------------------ NSPS --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum cleaned or etched --------------------------- Chromium.................................... 0.067 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 10.0 at all times. Subpart B Cleaning or Etching Rinse ------------------------------------------------------------------------ NSPS --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day 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.................................... 8.50 3.77 Oil and grease.............................. 13.91 13.91 Suspended solids............................ 20.87 16.70 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.0 to 10.0 at all times. Subpart B Cleaning or Etching Scrubber Liquor ------------------------------------------------------------------------ NSPS --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum cleaned or etched --------------------------- Chromium.................................... 0.72 0.29 Cyanide..................................... 0.39 0.16 Zinc........................................ 1.97 0.81 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 10.0 at all times. [48 FR 49149, Oct. 24, 1983; 49 FR 11631 and 11633, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988]