Regulations last checked for updates: Nov 24, 2024

Title 40 - Protection of Environment last revised: Nov 21, 2024
All TitlesTitle 40Chapter IPart 420Subpart L - Subpart L—Hot Coating Subcategory
Collapse to view only § 420.123 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
Table of Contents

§ 420.120 - Applicability; description of the hot coating subcategory.

§ 420.121 - Specialized definitions.

§ 420.122 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

§ 420.123 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

§ 420.124 - New source performance standards (NSPS).

§ 420.125 - Pretreatment standards for existing sources (PSES).

§ 420.126 - Pretreatment standards for new sources (PSNS).

§ 420.127 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).

§ 420.120 - Applicability; description of the hot coating subcategory.

(a) The provisions of this subpart are applicable to discharges and to the introduction of pollutants into publicly owned treatment works resulting from the operations in which steel is coated with zinc, terne metal, or other metals by the hot dip process, and those rinsing operations associated with that process.

(b) The BPT and BAT limitations for zinc set out below are not applicable to hot coating operations with wastewater treatment facilities achieving, during periods of normal production, zinc discharge levels more stringent than those BPT and BAT limitations. For such operations, the BPT and BAT limitations for zinc shall be determined on a case-by-case basis based upon the existing performance of the wastewater treatment facility. The permitting authority shall evaluate representative effluent data from the wastewater treatment facility during periods of normal production in establishing the case-by-case BPT and BAT limitations. The BPT and BAT limitations specified in 40 CFR 420.122 and 420.123 may be used as the basis for calculating total mass limitations for zinc pursuant to 40 CFR 420.03.

[47 FR 23284, May 27, 1982, as amended at 49 FR 21036, May 17, 1984]
§ 420.121 - Specialized definitions.

(a) The term galvanizing means coating steel products with zinc by the hot dip process including the immersion of the steel product in a molten bath of zinc metal, and the related operations preceding and subsequent to the immersion phase.

(b) The term terne coating means coating steel products with terne metal by the hot dip process including the immersion of the steel product in a molten bath of lead and tin metals, and the related operations preceding and subsequent to the immersion phase.

(c) The term other coatings means coating steel products with metals other than zinc or terne metal by the hot dip process including the immersion of the steel product in a molten bath of metal, and the related operations preceding the subsequent to the immersion phase.

(d) The term fume scrubber means wet air pollution control devices used to remove and clean fumes originating from hot coating operations.

(e) The term strip, sheet, and miscellaneous products means steel products other than wire products and fasteners.

(f) The term wire products and fasteners means steel wire, products manufactured from steel wire, and steel fasteners manufactured from steel wire or other steel shapes.

§ 420.122 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

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.

(a) Galvanizing, terne coating, and other coatings—(1) Strip, sheet, and miscellaneous products.

Subpart L

Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS0.1750.0751
O&G0.07510.0250
Lead0.001130.000376
Zinc0.001500.000500
Chromium (hexavalent) 10.0001500.0000501
pH( 2)( 2)

1 The limitations for hexavalent chromium shall apply only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS0.7010.300
O&G0.3000.100
Lead0.004510.00150
Zinc0.006010.00200
Chromium (hexavalent) 10.0006000.000200
pH( 2)( 2)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

(2) [Reserved]

(c) Fume scrubbers.

Subpart L

Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg per day
TSS38.116.3
O&G16.35.45
Lead0.2450.0819
Zinc0.3270.109
Chromium (hexavalent) 10.03270.0109
pH( 2)( 2)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above. [47 FR 23284, May 27, 1982; 47 FR 41739, Sept. 22, 1982, as amended at 49 FR 21036, May 17, 1984]
§ 420.123 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

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 available technology economically achievable.

(a) Galvanizing, terne coating and other coatings—(1) Strip, sheet, and miscellaneous products scrubbers.

Subpart L

Pollutant or pollutant property BAT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
Lead0.001130.000376
Zinc0.001500.000500
Chromium (hexavalent) 10.0001500.0000501

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewater from the chromate rinse step.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property BAT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
Lead0.004510.00150
Zinc0.006010.00200
Chromium (hexavalent) 10.0006010.000200

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

(2) [Reserved]

(c) Fume scrubbers.

Subpart L

Pollutant or pollutant property BAT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg per day
Lead0.03680.0123
Zinc0.04910.0164
Chromium (hexavalent) 10.004900.00163

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above. [47 FR 23284, May 27, 1982, as amended at 49 FR 21036, May 17, 1984]
§ 420.124 - New source performance standards (NSPS).

The discharge of wastewater pollutants from any new source subject to this subpart shall not exceed the standards set forth below.

(a) Galvanizing, terne coating and other coatings—(1) Strip, sheet, and miscellaneous products.

Subpart L

Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS0.04380.0188
O&G0.01880.00626
Lead0.0002820.0000939
Zinc0.0003760.000125
Chromium (hexavalent) 10.00003760.0000125
pH( 2)( 2)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS0.1750.0751
O&G0.07510.0250
Lead0.001130.000376
Zinc0.001500.000500
Chromium (hexavalent) 10.0001500.0000501
pH( 1)( 1)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

(2) [Reserved]

(c) Fume scrubbers.

Subpart L

New source performance standards Pollutant or pollutant property
Maximum for any 1 day Average of daily values for 30 consecutive days
kg/per day
TSS5.722.45
O&G2.450.819
Lead0.03680.0123
Zinc0.04910.0164
Chromium (hexavalent) 10.004900.00163
pH( 2)( 2)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above. [47 FR 23284, May 27, 1982, as amended at 49 FR 21036, May 17, 1984]
§ 420.125 - Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.

(a) Galvanizing, terne coating and other coatings—(1) Strip, sheet, and miscellaneous products.

Subpart L

Pretreatment standards for existing sources Pollutant or pollutant property
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
Lead0.001130.000376
Zinc0.001500.000500
Chromium (hexavalent) 10.0001500.0000501

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property Pretreatment standards for existing sources
Maximum for any 1 day Average of daily values for 30 consecutive days
kg/kkg (pounds per 1,000 lb) of product
Lead0.004510.00150
Zinc0.006010.00200
Chromium (hexavalent) 1 0.0006010.000200

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

(2) [Reserved]

(c) Fume scrubbers.

Subpart L

Pollutant or pollutant property Pretreatment standards for existing sources
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg per day
Lead0.03680.0123
Zinc0.04910.0164
Chromium (hexavalent) 1 0.004900.00163

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above. [47 FR 23284, May 27, 1982, as amended at 49 FR 21037, May 17, 1984]
§ 420.126 - Pretreatment standards for new sources (PSNS).

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources:

(a) Galvanizing, terne coatings and other coatings—(1) Strip, sheet, and miscellaneous products.

Subpart L

Pollutant or pollutant property Pretreatment standards for new sources
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
Lead0.0002820.0000939
Zinc0.0003760.000125
Chromium (hexavalent) 10.00003760.0000125

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property Pretreatment standards for new sources
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
Lead0.001130.000376
Zinc0.001500.000500
Chromium (hexavalent) 10.0001500.0000501

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

(2) [Reserved]

(c) Fume scrubbers.

Subpart L

Pollutant or pollutant property Pretreatment standards for new sources
Maximum for any 1 day Average of daily values for 30 consecutive days
Kilograms per day
Lead0.03680.0123
Zinc0.04910.0164
Chromium (Hexavalent) 10.004900.00163

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above. [47 FR 23284, May 27, 1982, as amended at 49 FR 21037, May 17, 1984]
§ 420.127 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).

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 conventional technology.

(a) Galvanizing, terne coating, and other coatings—(1) Strip, sheet, and miscellaneous products.

Subpart L

Pollutant or pollutant property BCT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS0.1750.0751
O&G0.07510.0250
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property BCT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS0.7010.300
O&G0.3000.100
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

(2) [Reserved]

(c) Fume scrubbers.

Subpart LBAT Effluent Limitations

Pollutant or pollutant property BCT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kilograms per day
TSS38.116.3
O&G16.35.45
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above.
authority: 33 U.S.C. 1311,1314,1316,1317,1318,1342,and
source: 47 FR 23284, May 27, 1982, unless otherwise noted.
cite as: 40 CFR 420.123
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