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Title 40

Displaying title 40, up to date as of 10/08/2026. Title 40 was last amended 10/08/2026.
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Subpart G—Zinc Subcategory

§ 461.70 Applicability; description of the zinc subcategory.

This subpart applies to discharges to waters of the United States, and introductions of pollutants into publicly owned treatment works from the manufacturing of zinc anode batteries.

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

(a) 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:

(1) Subpart G—Wet Amalgamated Powder Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium 1.67 0.68
Mercury 0.95 0.38
Silver 1.56 0.65
Zinc 5.55 2.32
Manganese 2.58 1.10
Oil and grease 76.0 45.6
TSS 155.8 74.1
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(2) Subpart G—Gelled Amalgam Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium 0.30 0.12
Mercury 0.17 0.07
Silver 0.28 0.12
Zinc 0.99 0.42
Manganese 0.46 0.20
Oil and grease 13.6 8.16
TSS 27.9 13.26
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(3) Subpart G—Zinc Oxide, Formed Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium 62.9 25.7
Mercury 35.8 14.3
Silver 58.7 24.3
Zinc 208.8 87.2
Manganese 97.2 41.5
Oil and grease 2,860.0 1,716.0
TSS 5,863.0 2,789.0
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(4) Subpart G—Electrodeposited Anodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc deposited
English units—pounds per 1,000,000 pounds of zinc deposited
Chromium 1,404.0 574.0
Mercury 798.0 319.0
Silver 1,308.0 543.0
Zinc 4,657.0 1,946.0
Manganese 2,169.0 925.0
Oil and grease 63,800.0 38,280.0
TSS 130,700.0 62,210.0
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(5) Subpart G—Silver Powder, Formed Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 86.2 35.3
Mercury 49.0 19.6
Silver 80.4 33.3
Zinc 286.2 119.6
Manganese 133.3 56.8
Oil and grease 3,920.0 2,350.0
TSS 8,036.0 3,822.0
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(6) Subpart G—Silver Oxide Powder, Formed Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 57.7 23.6
Mercury 32.8 13.1
Silver 53.7 22.3
Zinc 191.3 79.9
Manganese 89.1 38.0
Oil and grease 2,620.0 1,570.0
TSS 5,370.0 2,554.0
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(7) Subpart G—Silver Peroxide Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 13.8 5.65
Mercury 7.85 3.14
Silver 12.9 5.34
Zinc 45.8 19.2
Manganese 21.4 9.11
Oil and grease 628.0 377.0
TSS 1,287.0 612.0
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(8) Subpart G—Nickel Impregnated Cathodes.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of nickel applied
English units—pounds per 1,000,000 pounds of nickel applied
Chromium 721.6 295.2
Mercury 410.0 164.0
Nickel 3,149.0 2,083.0
Silver 672.4 279.0
Zinc 2,394.4 1,000.4
Manganese 1,115.2 475.6
Oil and grease 32,800.0 19,680.0
TSS 67,240.0 31,980.0
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(9) Subpart G—Miscellaneous Wastewater Streams.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of cells produced
English units—pounds per 1,000,000 pounds of cells produced
Chromium 3.85 1.58
Cyanide 2.54 1.05
Mercury 2.19 0.88
Nickel 16.82 11.12
Silver 3.59 1.49
Zinc 12.79 5.34
Manganese 5.96 2.54
Oil and grease 175.20 105.12
TSS 359.16 170.82
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(10) Subpart G—Silver Etch.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver processed
English units—pounds per 1,000,000 pounds of silver processed
Chromium 21.6 8.84
Mercury 12.3 4.91
Silver 20.2 8.35
Zinc 71.7 30.0
Manganese 33.4 14.3
Oil and grease 982.0 589.2
TSS 2,013.1 957.5
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(11) Subpart G—Silver Peroxide Production.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver peroxide processed
English units—pounds per 1,000,000 pounds of silver peroxide processed
Chromium 23.0 9.40
Mercury 13.1 5.22
Silver 21.4 8.88
Zinc 76.2 31.80
Manganese 35.5 15.10
Oil and grease 1,044.0 627.00
TSS 2,140.0 1,018.00
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(12) Subpart G—Silver Powder Production.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver powder processed
English units—pounds per 1,000,000 pounds of silver powder processed
Chromium 9.33 3.82
Mercury 5.30 2.12
Silver 8.69 3.61
Zinc 30.95 12.93
Manganese 14.42 6.15
Oil and grease 424.0 254.40
TSS 869.0 413.40
pH (1) (1)
1 Within the range of 7.5-10.0 at all times.

(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.

[49 FR 9134, Mar. 9, 1984; 49 FR 13879, Apr. 9, 1984]

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

(a) 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:

(1) Subpart G—Wet Amalgamated Powder Anodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium 0.24 0.099
Mercury 0.14 0.055
Silver 0.23 0.093
Zinc 0.80 0.34
Manganese 0.37 0.16

(2) Subpart G—Gelled Amalgam Anodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium 0.030 0.012
Mercury 0.017 0.007
Silver 0.028 0.012
Zinc 0.099 0.042
Manganese 0.046 0.020

(3) Subpart G—Zinc Oxide Formed Anodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of Zinc
English units—pounds per 1,000,000 pounds of Zinc
Chromium 9.53 3.90
Mercury 5.42 2.17
Silver 8.89 3.68
Zinc 31.64 13.22
Manganese 14.74 6.28

(4) Subpart G—Electrodeposited Anodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc deposited
English units—pounds per 1,000,000 pounds of zinc deposited
Chromium 94.47 38.65
Mercury 53.68 21.47
Silver 88.03 36.50
Zinc 313.46 130.97
Manganese 146.00 62.26

(5) Subpart G—Silver Powder Formed Cathodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 13.07 5.35
Mercury 7.43 2.97
Silver 12.18 5.05
Zinc 43.36 18.12
Manganese 20.20 8.61

(6) Subpart G—Silver Oxide Powder Formed Cathodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 8.73 3.57
Mercury 4.96 1.99
Silver 8.14 3.37
Zinc 28.98 12.11
Manganese 13.50 5.76

(7) Subpart G—Silver Peroxide Cathodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 2.09 0.87
Mercury 1.19 0.48
Silver 1.95 0.81
Zinc 6.95 2.90
Manganese 3.24 1.38

(8) Subpart G—Nickel Impregnated Cathodes.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of nickel applied
English units—pounds per 1,000,000 pounds of nickel applied
Chromium 88.0 36.0
Mercury 50.0 20.0
Nickel 384.0 254.0
Silver 82.0 34.0
Zinc 292.0 122.0
Manganese 136.0 58.0

(9) Subpart G—Miscellaneous Wastewater Streams.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of cells produced
English units—pounds per 1,000,000 pounds of cells produced
Chromium 0.57 0.23
Cyanide 0.38 0.16
Mercury 0.32 0.13
Nickel 2.48 1.64
Silver 0.53 0.22
Zinc 1.88 0.79
Manganese 0.88 0.37

(10) Subpart G—Silver Etch.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver processed
English units—pounds per 1,000,000 pounds of silver processed
Chromium 3.27 1.34
Mercury 1.86 0.74
Silver 3.05 1.26
Zinc 10.86 4.54
Manganese 5.06 2.16

(11) Subpart G—Silver Peroxide Production.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver peroxide produced
English units—pounds per 1,000,000 pounds of silver peroxide produced
Chromium 3.48 1.42
Mercury 1.98 0.79
Silver 3.24 1.34
Zinc 11.55 4.83
Manganese 5.38 2.29

(12) Subpart G—Silver Powder Production.

BAT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver powder produced
English units—pounds per 1,000,000 pounds of silver powder produced
Chromium 1.41 0.58
Mercury 0.80 0.32
Silver 1.32 0.55
Zinc 4.69 1.96
Manganese 2.18 0.93

(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.

[49 FR 9134, Mar. 9, 1984; 49 FR 13879, Apr. 9, 1984]

§ 461.73 New source performance standards. (NSPS).

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

(1) Subpart G—Zinc Oxide Formed Anodes—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc
English units—pounds per 1,000,000 pounds of zinc
Chromium 4.55 1.97
Mercury 2.82 1.19
Silver 4.55 1.97
Zinc 0.87 0.39
Manganese 6.50 4.98
Oil and grease 216.7 216.7
TSS 325.0 260.0
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(2) Subpart G—Electrodeposited Anodes—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc deposited
English units—pounds per 1,000,000 pounds of zinc deposited
Chromium 45.09 19.54
Mercury 27.91 11.81
Silver 45.09 19.54
Zinc 8.59 3.86
Manganese 64.41 49.38
Oil and grease 2,147.00 2,147.00
TSS 3,220.50 2,576.40
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(3) Subpart G—Silver Powder Formed Cathodes—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 6.24 2.70
Mercury 3.86 1.63
Silver 6.24 2.70
Zinc 1.19 0.53
Manganese 8.91 6.83
Oil and grease 297.00 297.00
TSS 445.5 356.40
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(4) Subpart G—Silver Oxide Powder Formed Cathodes—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 4.17 1.81
Mercury 2.58 1.09
Silver 4.17 1.81
Zinc 0.79 0.36
Manganese 5.96 4.57
Oil and grease 198.5 198.5
TSS 297.8 238.2
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(5) Subpart G—Silver Peroxide Cathodes—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 1.00 0.43
Mercury 0.62 0.26
Silver 1.00 0.43
Zinc 0.19 0.09
Manganese 1.43 1.09
Oil and grease 47.6 47.6
TSS 71.4 57.1
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(6) Subpart G—Nickel Impregnated Cathodes—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of nickel applied
English units—pounds per 1,000,000 pounds of nickel applied
Chromium 42.0 18.2
Mercury 26.0 11.0
Nickel 42.0 18.2
Silver 42.0 18.2
Zinc 8.0 3.6
Manganese 60.0 46.0
Oil and grease 2,000.0 2,000.0
TSS 3,000.0 2,400.00
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(7) Subpart G—Miscellaneous Wastewater Streams—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of cells produced
English units—pounds per 1,000,000 pounds of cells produced
Chromium 0.27 0.12
Cyanide 0.039 0.016
Mercury 0.17 0.07
Nickel 0.27 0.12
Silver 0.27 0.12
Zinc 0.05 0.02
Manganese 0.39 0.30
Oil and grease 12.90 12.90
TSS 19.35 15.48
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(8) Subpart G—Silver Etch—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver processed
English units—pounds per 1,000,000 pounds of silver processed
Chromium 1.56 0.68
Mercury 0.97 0.41
Silver 1.56 0.68
Zinc 0.30 0.13
Manganese 2.23 1.71
Oil and grease 74.40 74.40
TSS 111.60 89.28
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(9) Subpart G—Silver Peroxide Production—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver peroxide produced
English units—pounds per 1,000,000 pounds of silver peroxide produced
Chromium 1.66 0.72
Mercury 1.03 0.44
Silver 1.66 0.72
Zinc 0.32 0.14
Manganese 2.37 1.82
Oil and grease 79.10 79.10
TSS 118.65 94.92
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(10) Subpart G—Silver Powder Production—NSPS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver powder produced
English units—pounds per 1,000,000 pounds of silver powder produced
Chromium 0.67 0.29
Mercury 0.42 0.18
Silver 0.67 0.29
Zinc 0.13 0.06
Manganese 0.96 0.74
Oil and grease 32.10 32.10
TSS 48.15 38.52
pH (1) (1)
1 Within the limits of 7.5-10.0 at all times.

(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.

§ 461.74 Pretreatment standards for existing sources (PSES).

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

(1) Subpart G—Wet Amalgamated Powder Anode—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc
English units—pounds per 1,000,000 pounds of zinc
Chromium 0.24 0.099
Mercury 0.14 0.055
Silver 0.23 0.093
Zinc 0.80 0.34
Manganese 0.37 0.16

(2) Subpart G—Gelled Amalgam Anodes—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc
English units—pounds per 1,000,000 pounds of zinc
Chromium 0.030 0.12
Mercury 0.017 0.006
Silver 0.028 0.012
Zinc 0.099 0.042
Manganese 0.046 0.020

(3) Subpart G—Zinc Oxide Formed Anodes—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc
English units—pounds per 1,000,000 pounds of zinc
Chromium 9.53 3.90
Mercury 5.42 2.17
Silver 8.89 3.68
Zinc 31.64 13.22
Manganese 14.74 6.28

(4) Subpart G—Electrodeposited Anodes—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc deposited
English units—pounds per 1,000,000 pounds of zinc deposited
Chromium 94.47 38.65
Mercury 53.68 21.47
Silver 88.03 36.50
Zinc 313.46 130.97
Manganese 146.00 62.26

(5) Subpart G—Silver Powder Formed Cathodes—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 13.07 5.35
Mercury 7.43 2.97
Silver 12.18 5.05
Zinc 43.36 18.12
Maganese 20.20 8.61

(6) Subpart G—Silver Oxide Powder Formed Cathodes—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 8.73 3.57
Mercury 4.96 1.99
Silver 8.14 3.37
Zinc 28.98 12.11
Manganese 13.50 5.76

(7) Subpart G—Silver Peroxide Cathodes—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 2.09 0.87
Mercury 1.19 0.48
Silver 1.95 0.81
Zinc 6.95 2.90
Manganese 3.24 1.38

(8) Subpart G—Nickel Impregnated Cathodes—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of nickel applied
English units—pounds per 1,000,000 pounds of nickel applied
Chromium 88.0 36.0
Mercury 50.0 20.0
Nickel 384.0 254.0
Silver 82.0 34.0
Zinc 292.0 122.0
Manganese 136.0 58.0

(9) Subpart G—Miscellaneous Wastewater Streams—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of cells produced
English units—pounds per 1,000,000 pounds of cells produced
Chromium 0.57 0.23
Cyanide 0.38 0.16
Mercury 0.32 0.13
Nickel 2.48 1.64
Silver 0.53 0.22
Zinc 1.88 0.79
Manganese 0.88 0.37

(10) Subpart G—Silver Etch—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver processed
English units—pounds per 1,000,000 pounds of silver processed
Chromium 3.27 1.34
Mercury 1.86 0.74
Silver 3.05 1.26
Zinc 10.86 4.54
Manganese 5.06 2.16

(11) Subpart G—Silver Peroxide Production—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver peroxide produced
English units—pounds per 1,000,000 pounds of silver peroxide produced
Chromium 3.48 1.42
Mercury 1.98 0.79
Silver 3.24 1.34
Zinc 11.55 4.83
Manganese 5.38 2.29

(12) Subpart G—Silver Powder Production—PSES.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver powder produced
English units—pounds per 1,000,000 pounds of silver powder produced
Chromium 1.41 0.58
Mercury 0.80 0.32
Silver 1.32 0.55
Zinc 4.69 1.96
Manganese 2.18 0.93

(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.

§ 461.75 Pretreatment standards for new sources (PSNS).

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

(1) Subpart G—Zinc Oxide Formed Anodes—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc
English units—pounds per 1,000,000 pounds of zinc
Chromium 4.55 1.97
Mercury 2.82 1.19
Silver 4.55 1.97
Zinc 0.87 0.39
Manganese 6.50 4.98

(2) Subpart G—Electrodeposited Anodes—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of zinc deposited
English units—pounds per 1,000,000 pounds of zinc deposited
Chromium 45.09 19.54
Mercury 27.91 11.81
Silver 45.09 19.54
Zinc 8.59 3.86
Manganese 64.41 49.38

(3) Subpart G—Silver Powder Formed Cathodes—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 6.24 2.70
Mercury 3.86 1.63
Silver 6.24 2.70
Zinc 1.19 0.53
Manganese 8.91 6.83

(4) Subpart G—Silver Oxide Powder Formed Cathodes—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 4.17 1.81
Mercury 2.58 1.09
Silver 4.17 1.81
Zinc 0.79 0.36
Manganese 5.96 4.57

(5) Subpart G—Silver Peroxide Cathodes—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver applied
English units—pounds per 1,000,000 pounds of silver applied
Chromium 1.00 0.43
Mercury 0.62 0.26
Silver 1.00 0.43
Zinc 0.19 0.09
Manganese 1.43 1.09

(6) Subpart G—Nickel Impregnated Cathodes—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of nickel applied
English units—pounds per 1,000,000 pounds of nickel applied
Chromium 42.0 18.2
Mercury 26.0 11.0
Nickel 42.0 18.2
Silver 42.0 18.2
Zinc 8.0 3.6
Manganese 60.0 46.0

(7) Subpart G—Miscellaneous Wastewater Streams—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of cells produced
English units—pounds per 1,000,000 pounds of cells produced
Chromium 0.27 0.12
Cyanide 0.039 0.016
Mercury 0.17 0.07
Nickel 0.27 0.12
Silver 0.27 0.12
Zinc 0.05 0.02
Manganese 0.39 0.30

(8) Subpart G—Silver Etch—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver processed
English units—pounds per 1,000,000 pounds of silver processed
Chromium 1.56 0.68
Mercury 0.97 0.41
Silver 1.56 0.68
Zinc 0.30 0.13
Manganese 2.23 1.71

(9) Subpart G—Silver Peroxide Production—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver peroxide produced
English units—pounds per 1,000,000 pounds of silver peroxide produced
Chromium 1.66 0.72
Mercury 1.03 0.44
Silver 1.66 0.72
Zinc 0.32 0.14
Manganese 2.37 1.82

(10) Subpart G—Silver Powder Production—PSNS.

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units—mg/kg of silver powder produced
English units—pounds per 1,000,000 pounds of silver powder produced
Chromium 0.67 0.29
Mercury 0.42 0.18
Silver 0.67 0.29
Zinc 0.13 0.06
Manganese 0.96 0.74

(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.

[49 FR 9134, Mar. 9, 1984; 49 FR 13879, Apr. 9, 1984]