Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 421Subpart K - Subpart K—Primary Columbium-Tantalum Subcategory
View all text of Subpart K [§ 421.110 - § 421.117]
§ 421.114 - Standards of performance for new sources.

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

(a) Subpart K—Concentrate Digestion 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 concentrate digested
Lead.174.081
Zinc.635.261
Ammonia (as N)82.91036.450
Fluoride21.77012.440
Total suspended solids9.3307.464
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(b) Subpart K—Solvent Extraction Raffinate.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate digested
Lead2.5921.203
Zinc9.4423.888
Ammonia (as N)1,233.000542.5000
Fluoride324.000185.100
Total Suspended Solids138.900111.100
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(c) Subpart K—Solvent Extraction 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 concentrate digested
Lead.069.032
Zinc.251.103
Ammonia (as N)32.79014.420
Fluoride8.6104.920
Total suspended solids3.6902.952
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(d) Subpart K—Precipitation and Filtration.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate digested
Lead3.8331.780
Zinc13.9605.750
Ammonia (as N)1,825.000802.200
Fluoride479.100273.800
Total suspended solids205.400164.300
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(e) Subpart K—Precipitation and Filtration 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 concentrate digested
Lead1.778.826
Zinc6.4782.668
Ammonia (as N)846.600372.200
Fluoride222.300127.000
Total suspended solids95.27076.210
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(f) Subpart K—Tantalum Salt Drying.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tantalum salt dried
Lead16.9507.871
Zinc61.75025.430
Ammonia (as N)8,070.0003,548.000
Fluoride2,119.0001,211.000
Total suspended solids908.200726.500
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(g) Subpart K—Oxides Calcining 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 columbium-tantalum oxide dried
Lead1.076.500
Zinc3.9191.614
Ammonia (as N)512.200225.200
Fluoride134.50076.840
Total suspended solids57.63046.110
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(h) Subpart K—Reduction of Tantalum Salt to Metal.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tantalum salt reduced
Lead46.50021.590
Zinc169.40069.750
Ammonia (as N)22,140.0009,732.000
Fluoride5,813.0003,322.000
Total suspended solids2,491.0001,993.000
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(i) Subpart K—Reduction of Tantalum Salt to Metal 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 tantalum salt reduced
Lead.572.266
Zinc2.084.858
Ammonia (as N)272.400119.700
Fluoride71.51040.860
Total suspended solids30.65024.520
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(j) Subpart K—Tantalum Powder Wash.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of tantalum powder washed
Lead5.7212.656
Zinc20.8408.582
Ammonia (as N)2,724.0001,198.000
Fluoride715.200408.700
Total suspended solids306.500245.200
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(k) Subpart K—Consolidation and Casting Contact Cooling.

NSPS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated
Lead.000.000
Zinc.000.000
Ammonia (as N).000.000
Fluoride.000.000
Total suspended solids.000.000
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

[49 FR 8817, Mar. 8, 1984, as amended at 49 FR 29795, July 24, 1984; 50 FR 12253, Mar. 28, 1985]
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316 (b) andc, 1317 (b) andc,1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
cite as: 40 CFR 421.114
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