[Code of Federal Regulations] [Title 40, Volume 29] [Revised as of July 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR467.32] [Page 632-633] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 467_ALUMINUM FORMING POINT SOURCE CATEGORY--Table of Contents Subpart C_Extrusion Subcategory Sec. 467.32 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 representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available: Subpart C Core ------------------------------------------------------------------------ BPT effluent limitations --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum extruded --------------- Chromium.................................... 0.16 0.066 Cyanide..................................... 0.11 0.044 Zinc........................................ 0.53 0.22 Aluminum.................................... 2.34 1.16 Oil and grease.............................. 7.32 4.39 Suspended solids............................ 15.0 7.13 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.0 to 10.0 at all times. Subpart C Extrusion Press Leakage ------------------------------------------------------------------------ BPT effluent limitations --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum extruded --------------- Chromium.................................... 0.65 0.27 Cyanide..................................... 0.43 0.18 Zinc........................................ 2.16 0.90 Aluminum.................................... 9.51 4.73 Oil and grease.............................. 29.56 17.74 Suspended solids............................ 60.60 28.82 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ With the range of 7.0 to 10.0 at all times. Subpart C Direct Chill Casting Contact Cooling Water ------------------------------------------------------------------------ BPT effluent limitations --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum cast --------------- Chromium.................................... 0.59 0.24 Cyanide..................................... 0.39 0.16 Zinc........................................ 1.94 0.81 Aluminum.................................... 8.55 4.26 Oil and grease.............................. 26.58 15.95 Suspended solids............................ 54.49 25.92 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 633]] Subpart C Press Heat Treatment Contact Cooling Water ------------------------------------------------------------------------ BPT effluent limitations --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day 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 10.0 at all times. Subpart C Solution Heat Treatment Contact Cooling Water ------------------------------------------------------------------------ BPT effluent limitations --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day 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 10.0 at all times. Subpart C Cleaning or Etching Bath ------------------------------------------------------------------------ BPT effluent limitations --------------------------- 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.................................... 0.079 0.032 Cyanide..................................... 0.052 0.022 Zinc........................................ 0.26 0.109 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 10.0 at all times. Subpart C Cleaning or Etching Rinse ------------------------------------------------------------------------ BPT effluent limitations --------------------------- 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.................................... 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 10.0 at all times. Subpart C Cleaning or Etching Scrubber Liquor ------------------------------------------------------------------------ BPT effluent limitations --------------------------- 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.................................... 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 10.0 at all times. Subpart C Degassing Scrubber Liquor ------------------------------------------------------------------------ BPT effluent limitations --------------------------- Pollutant or pollutant property Maximum for Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (lb/million off- lbs) of aluminum degassed --------------- Chromium.................................... 1.15 0.47 Cyanide..................................... 0.76 0.32 Zinc........................................ 3.81 1.59 Aluminum.................................... 16.78 8.35 Oil and grease.............................. 52.18 31.31 Suspended solids............................ 106.97 50.88 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] [[Page 634]]