40 CFR 421.254 - Standards of performance for new sources.

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§ 421.254 Standards of performance for new sources.

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

(a) Smelter wet air pollution control.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of gold and silver smelted
Lead 0.364 0.169
Mercury 0.195 0.078
Silver 0.377 0.156
Zinc 1.326 0.546
Gold 0.130
Oil and Grease 13.000 13.000
Total suspended solids 19.500 15.600
pH ( 1) ( 1)

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

(b) Silver chloride reduction spent solution.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver reduced in solution
Lead 0.112 0.052
Mercury 0.060 0.024
Silver 0.116 0.048
Zinc 0.408 0.168
Gold 0.040
Oil and Grease 4.000 4.000
Total suspended solids 6.000 4.800
pH ( 1) ( 1)

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

(c) Electrolytic cells wet air pollution control.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of gold refined electrolytically
Lead 5.544 2.574
Mercury 2.970 1.188
Silver 5.742 2.376
Zinc 20.200 8.316
Gold 1.980
Oil and Grease 198.000 198.000
Total suspended solids 297.000 237.600
pH ( 1) ( 1)

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

(d) Electrolyte preparation wet air pollution control.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver in electrolyte produced
Lead 0.014 0.007
Mercury 0.008 0.003
Silver 0.015 0.006
Zinc 0.051 0.021
Gold 0.005
Oil and Grease 0.500 0.500
Total suspended solids 0.750 0.600
pH ( 1) ( 1)

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

(e) Calciner wet air pollution control.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of mercury condensed
Lead 6.160 2.860
Mercury 3.300 1.320
Silver 6.380 2.640
Zinc 22.440 9.240
Gold 2.200
Oil and Grease 220.000 220.000
Total suspended solids 330.000 264.000
pH ( 1) ( 1)

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

(f) Calcine quench water.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of mercury condensed
Lead 4.928 2.288
Mercury 2.640 1.056
Silver 5.104 2.112
Zinc 17.950 7.392
Gold 1.760
Oil and Grease 176.000 176.000
Total suspended solids 264.000 211.200
pH ( 1) ( 1)

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

(g) Calciner stack gas contract cooling water.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) or mercury condensed
Lead 1.162 0.540
Mercury 0.623 0.249
Silver 1.204 0.498
Zinc 4.233 1.743
Gold 0.415
Oil and Grease 41.500 41.500
Total suspended solids 62.250 49.800
pH ( 1) ( 1)

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

(h) Condenser blowdown.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of mercury condensed
Lead 3.864 1.794
Mercury 2.070 0.828
Silver 4.002 1.656
Zinc 14.080 5.796
Gold 1.380
Oil and Grease 138.000 138.000
Total suspended solids 207.000 165.600
pH ( 1) ( 1)

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

(i) Mercury cleaning bath water.

NSPS for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of Mercury condensed
Lead 0.392 0.182
Mercury 0.210 0.084
Silver 0.406 0.168
Zinc 1.428 0.588
Gold 0.140
Oil and Grease 14.000 14.000
Total suspended solids 21.000 16.800
pH ( 1) ( 1)

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

[50 FR 38361, Sept. 20, 1985; 50 FR 41144, Oct. 9, 1985]

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