Statutes, codes, and regulations
Code of Federal Regulations
Title 40 - PROTECTION OF ENVIRONMENTChapter I - ENVIRONMENTAL PROTECTION AGENCYSubchapter N - EFFLUENT GUIDELINES AND STANDARDSPart 421 - NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
Subpart C - SECONDARY ALUMINUM SMELTING SUBCATEGORY
Section 421.34 - Standards of performance for new sources

40 C.F.R. § 421.34

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Current through October 31, 2024
Section 421.34 - Standards of performance for new sources

Any new source subject to this subpart shall achieve the following new source performance standards:

(a) Subpart C-Scrap Drying Wet Air Pollution Control.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average.
mg/kg (pounds per million pounds) of aluminum scrap dried
Lead.000.000
Zinc.000.000
Aluminum.000.000
Ammonia (as N).000.000
Total suspended solids.000.000
Oil and grease.000.000
pH(1)(1)

1 Within the range of 7.0 to 10.0 at all times

(b) Subpart C-Scrap Screening and Milling.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of aluminum scrap screened and milled
Lead.000.000
Zinc.000.000
Aluminum.000.000
Ammonia (as N).000.000
Total suspended solids.000.000
Oil and grease.000.000
pH(1)(1)

1 Within the range of 7.0 to 10.0 at all times.

(c) Subpart C-Dross Washing.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of dross washed
Lead.000.000
Zinc.000.000
Aluminum.000.000
Ammonia (as N).000.000
Total suspended solids.000.000
Oil and grease.000.000
pH(1)(1)

1 Within the range of 7.0 to 10.0 at all times.

(d) Subpart C-Demagging Wet Air Pollution Control.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (lb/million lbs) of aluminum demagged
Lead0.2160.100
Zinc0.7860.324
Aluminum4.7112.090
Ammonia (as N)102.80045.180
Total suspended solids11.5709.252
Oil and grease7.7107.710
pH(1)(1)

1 Within the range of 7.0 to 10.0 at all times.

(e) Subpart C-Delacquering Wet Air Pollution Control.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of aluminum delacquered
Lead0.0930.043
Zinc0.3400.140
Aluminum2.0350.903
Ammonia (as N)44.38919.514
Total phenolics (4-AAP method)10.004
Total suspended solids4.9953.996
Oil and grease3.3303.330
pH(2)(2)

1 At the source.

2 Within the range of 7.0 to 10.0 at all times.

(f) Subpart C-Direct Chill Casting Contact Cooling.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of aluminum cast
Lead.372.173
Zinc1.356.558
Aluminum8.1203.602
Ammonia (as N)177.20077.880
Total suspended solids19.94015.950
Oil and grease13.29013.290
pH(1)(1)

1 Within the range of 7.0 to 10.0 at all times.

(g) Subpart C-Ingot Conveyor Casting Contact Cooling (When Chlorine Demagging Wet Air Pollution Control is Not Practiced On-Site).

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (lb/million lbs) of aluminum cast
Lead0.0190.009
Zinc0.0680.028
Aluminum0.4090.182
Ammonia (as N)8.9313.926
Total suspended solids1.0050.804
Oil and grease0.6700.670
pH(1)(1)

1 Within the range of 7.0 to 10.0 at all times.

(h) Subpart C-Ingot Conveyor Casting Contact Cooling (When Chlorine Demagging Wet Air Pollution Control is Practiced On Site).

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of aluminum cast
Lead.000.000
Zinc.000.000
Aluminum.000.000
Ammonia (as N).000.000
Total suspended solids.000.000
Oil and grease.000.000
pH(1)(1)

1Within the range of 7.0 to 10.0 at all times.

(i) Subpart C-Stationary Casting Contact Cooling.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of aluminum cast
Lead.000.000
Zinc.000.000
Aluminum.000.000
Ammonia (as N).000.000
Total suspended solids.000.000
Oil and grease.000.000
pH(1)(1)

1Within the range of 7.0 to 10.0 at all times.

(j) Subpart C-Shot Casting Contact Cooling.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of aluminum cast
Lead.000.000
Zinc.000.000
Aluminum.000.000
Ammonia (as N).000.000
Total suspended solids.000.000
Oil and grease.000.000
pH(1)(1)

1 Within the range of 7.0 to 10.0 at all times.

40 C.F.R. §421.34

49 FR 8796, Mar. 8, 1984, as amended at 49 FR 29794, July 24, 1984; 52 FR 25559, July 7, 1987