40 CFR 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.