Any new source subject to this subpart must achieve the following performance standards.
(a) There shall be no discharge allowance for wastewater pollutants from the degassing operation.
(b) The discharge of wastewater pollutants from the core and ancillary operations except those listed in paragraph (a) shall not exceed the values set forth below:
Subpart C
Core ------------------------------------------------------------------------
NSPS
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum extruded
---------------------------Chromium.................................... 0.13 0.051Cyanide..................................... 0.068 0.027Zinc........................................ 0.35 0.14Aluminum.................................... 2.07 0.92Oil and grease.............................. 3.39 3.39Suspended solids............................ 5.10 4.07pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times.
Subpart C
Extrusion Press Leakage ------------------------------------------------------------------------
NSPS
---------------------------
Pollutant or pollutant property Maximum for
Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/off-kg (lb/million off-
lbs) of aluminum extruded
---------------------------Chromium.................................... 0.11 0.045Cyanide..................................... 0.060 0.024Zinc........................................ 0.31 0.126Aluminum.................................... 1.82 0.81Oil and grease.............................. 2.98 2.98Suspended solids............................ 4.47 3.58pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times.
Subpart C
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 0.20Cyanide....................................... 0.27 0.11Zinc.......................................... 1.36 0.56Aluminum...................................... 8.12 3.60Oil and grease................................ 13.29 13.29Suspended solids.............................. 19.94 15.95pH............................................ (\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 ------------------------------------------------------------------------
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 0.31Cyanide....................................... 0.41 0.17Zinc.......................................... 2.08 0.86Aluminum...................................... 12.45 5.52Oil and grease................................ 20.37 20.37Suspended solids.............................. 30.56 24.45pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times.
Subpart C
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 0.31Cyanide..................................... 0.41 0.17Zinc........................................ 2.08 0.86Aluminum.................................... 12.45 5.52Oil and grease.............................. 20.37 20.37Suspended solids............................ 30.56 24.45pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times.
Subpart C
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 0.027Cyanide..................................... 0.036 0.015Zinc........................................ 0.183 0.075Aluminum.................................... 1.094 0.485Oil and grease.............................. 1.79 1.79Suspended solids............................ 2.69 2.15pH.......................................... (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times.
Subpart C
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 0.21Cyanide....................................... 0.28 0.11Zinc.......................................... 1.42 0.59Aluminum...................................... 8.50 3.77Oil and grease................................ 13.91 13.91Suspended solids.............................. 20.87 16.70pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times.
Subpart C
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 0.29Cyanide....................................... 0.39 0.16Zinc.......................................... 1.97 0.81Aluminum...................................... 11.81 5.24Oil and grease................................ 19.33 19.33Suspended solids.............................. 29.00 23.20pH............................................ (\1\) (\1\)------------------------------------------------------------------------\1\ Within the range of 7.0 to 10.0 at all times.
[48 FR 49149, Oct. 24, 1983; 49 FR 11633 and 11634, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988]