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 0.066Cyanide..................................... 0.11 0.044Zinc........................................ 0.53 0.22Aluminum.................................... 2.34 1.16Oil and grease.............................. 7.32 4.39Suspended solids............................ 15.0 7.13pH.......................................... (\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 0.27Cyanide..................................... 0.43 0.18Zinc........................................ 2.16 0.90Aluminum.................................... 9.51 4.73Oil and grease.............................. 29.56 17.74Suspended solids............................ 60.60 28.82pH.......................................... (\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 0.24Cyanide..................................... 0.39 0.16Zinc........................................ 1.94 0.81Aluminum.................................... 8.55 4.26Oil and grease.............................. 26.58 15.95Suspended solids............................ 54.49 25.92pH.......................................... (\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.
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 1.39Cyanide..................................... 2.24 0.93Zinc........................................ 11.25 4.70Aluminum.................................... 49.55 24.66Oil and grease.............................. 154.10 92.46Suspended solids............................ 315.91 150.25pH.......................................... (\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 1.39Cyanide..................................... 2.24 0.93Zinc........................................ 11.25 4.70Aluminum.................................... 49.55 24.66Oil and grease.............................. 154.10 92.46Suspended solids............................ 315.91 150.25pH.......................................... (\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 0.032Cyanide..................................... 0.052 0.022Zinc........................................ 0.26 0.109Aluminum.................................... 1.15 0.573Oil and grease.............................. 3.58 2.15Suspended solids............................ 7.34 3.49pH.......................................... (\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 2.51Cyanide..................................... 4.04 1.67Zinc........................................ 20.31 8.49Aluminum.................................... 89.46 44.52Oil and grease.............................. 278.24 166.95Suspended solids............................ 570.39 271.29pH.......................................... (\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 2.86Cyanide..................................... 4.61 1.91Zinc........................................ 23.22 9.70Aluminum.................................... 102.24 50.88Oil and grease.............................. 318.00 190.80Suspended solids............................ 651.90 310.05pH.......................................... (\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 0.47Cyanide..................................... 0.76 0.32Zinc........................................ 3.81 1.59Aluminum.................................... 16.78 8.35Oil and grease.............................. 52.18 31.31Suspended solids............................ 106.97 50.88pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times. [48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11633, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988]