1. Regulations
  2. title 40
  3. chapter I-i30
  4. part 421
  5. subpart W
  6. § 421.255

Collapse to view only § 421.255 - [Reserved]

§ 421.250 - Applicability: Description of the primary precious metals and mercury subcategory.

The provisions of this subpart are applicable to discharges resulting from the production of gold, silver, or mercury by primary precious metals and mercury facilities.

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.250

§ 421.251 - Specialized definitions.

For the purpose of this subpart the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.251

§ 421.252 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:

(a) Smelter wet air pollution control.

BPT Limitations 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 Lead0.5460.260 Mercury0.3250.130 Silver0.5330.221 Zinc1.8980.793 Gold0.130Oil and grease26.00015.600 Total suspended solids53.30025.350 pH( 1)( 1)

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

(b) Silver chloride reduction spent solution.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant of pollutant property Maximum for any 1 day Maximum for monthly average mg/troy ounce of silver reduced in solution Lead0.1680.080 Mercury0.1000.040 Silver0.1640.068 Zinc0.5840.244 Gold0.040Oil and grease8.0004.800 Total suspended solids16.4007.800 pH( 1)( 1)

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

(c) Electrolytic cells wet air pollution control.

BPT Limitations 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 Lead83.16039.600 Mercury49.50019.800 Silver81.18033.660 Zinc289.100120.800 Gold19.800Oil and grease3,960.0002,376.000 Total suspended solids8,118.0003,861.000 pH( 1)( 1)

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

(d) Electrolyte preparation wet air pollution control.

BPT Limitations 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 Lead0.0210.010 Mercury0.0130.005 Silver0.0210.009 Zinc0.0730.031 Gold0.005Oil and Grease1.0000.600 Total suspended solids2.0500.975 pH( 1)( 1)

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

(e) Calciner wet air pollution control.

BPT Limitations 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 Lead78.20037.240 Mercury46.55018.620 Silver76.34031.650 Zinc271.900113.600 Gold18.600Oil and Grease3,724.0002,234.000 Total suspended solids7,634.0003,631.000 pH( 1)( 1)

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

(f) Calcine quench water.

BPT Limitations 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 Lead7.3923.520 Mercury4.4001.760 Silver7.2162.992 Zinc25.70010.740 Gold1.760Oil and Grease352.000211.200 Total suspended solids721.600343.200 pH( 1)( 1)

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

(g) Calciner stack gas contact cooling water.

BPT Limitations 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 Lead1.7430.830 Mercury1.0380.415 Silver1.7020.706 Zinc6.0592.532 Gold0.415Oil and Grease83.00049.800 Total suspended solids170.20080.930 pH( 1)( 1)

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

(h) Condenser blowdown.

BPT Limitations 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 Lead5.7962.760 Mercury3.4501.380 Silver5.6582.346 Zinc20.1508.418 Gold1.380Oil and Grease276.000165.600 Total suspended solids565.800269.100 pH( 1)( 1)

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

(i) Mercury cleaning bath water.

BPT Limitations 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 Lead0.5880.280 Mercury0.3500.140 Silver0.5740.238 Zinc2.0440.854 Gold0.140Oil and Grease28.00016.800 Total suspended solids57.40027.300 pH( 1)( 1)

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

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.252

§ 421.253 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable:

(a) Smelter wet air pollution control.

BAT Limitations 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 Lead0.3640.169 Mercury0.1950.078 Silver0.3770.156 Zinc1.3260.546 Gold0.130

(b) Silver chloride reduction spent solution.

BAT Limitations 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 Lead0.1120.052 Mercury0.0600.024 Silver0.1160.048 Zinc0.4080.168 Gold0.040

(c) Electrolytic cells wet air pollution control.

BAT Limitations 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 Lead5.5442.574 Mercury2.9701.188 Silver5.7422.376 Zinc20.2008.316 Gold1.980

(d) Electrolyte preparation wet air pollution control.

BAT Limitations 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 Lead0.0140.007 Mercury0.0080.003 Silver0.0150.006 Zinc0.0510.021 Gold0.005

(e) Calciner Wet Air Pollution Control.

BAT Limitations 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 Lead6.1602.860 Mercury3.3001.320 Silver6.3802.640 Zinc22.4409.240 Gold2.200

(f) Calcine quench water.

BAT Limitations 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 Lead4.9282.288 Mercury2.6401.056 Silver5.1042.112 Zinc17.9507.392 Gold1.760

(g) Calciner stack gas contact cooling water.

BAT Limitations 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 Lead1.1620.540 Mercury0.6230.249 Silver1.2040.498 Zinc4.2331.743 Gold0.415

(h) Condenser blowdown.

BAT Limitations 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 Lead3.8641.794 Mercury2.0700.828 Silver4.0021.656 Zinc14.0805.796 Gold1.380

(i) Mercury cleaning bath water.

BAT Limitations 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 Lead0.3920.182 Mercury0.2100.084 Silver0.4060.168 Zinc1.4280.588 Gold0.140

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.253

§ 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 Lead0.3640.169 Mercury0.1950.078 Silver0.3770.156 Zinc1.3260.546 Gold0.130Oil and Grease13.00013.000 Total suspended solids19.50015.600 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 Lead0.1120.052 Mercury0.0600.024 Silver0.1160.048 Zinc0.4080.168 Gold0.040Oil and Grease4.0004.000 Total suspended solids6.0004.800 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 Lead5.5442.574 Mercury2.9701.188 Silver5.7422.376 Zinc20.2008.316 Gold1.980Oil and Grease198.000198.000 Total suspended solids297.000237.600 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 Lead0.0140.007 Mercury0.0080.003 Silver0.0150.006 Zinc0.0510.021 Gold0.005Oil and Grease0.5000.500 Total suspended solids0.7500.600 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 Lead6.1602.860 Mercury3.3001.320 Silver6.3802.640 Zinc22.4409.240 Gold2.200Oil and Grease220.000220.000 Total suspended solids330.000264.000 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 Lead4.9282.288 Mercury2.6401.056 Silver5.1042.112 Zinc17.9507.392 Gold1.760Oil and Grease176.000176.000 Total suspended solids264.000211.200 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 Lead1.1620.540 Mercury0.6230.249 Silver1.2040.498 Zinc4.2331.743 Gold0.415Oil and Grease41.50041.500 Total suspended solids62.25049.800 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 Lead3.8641.794 Mercury2.0700.828 Silver4.0021.656 Zinc14.0805.796 Gold1.380Oil and Grease138.000138.000 Total suspended solids207.000165.600 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 Lead0.3920.182 Mercury0.2100.084 Silver0.4060.168 Zinc1.4280.588 Gold0.140Oil and Grease14.00014.000 Total suspended solids21.00016.800 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]

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.254

§ 421.255 - [Reserved]

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.255

§ 421.256 - Pretreatment standards for new sources.

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. The mass of wastewater pollutants in primary precious metals and mercury process wastewater introduced into a POTW shall not exceed the following values:

(a) Smelter wet air pollution control.

PSNS 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 Lead0.3640.169 Mercury0.1950.078 Silver0.3770.156 Zinc1.3260.546 Gold0.130

(b) Silver chloride reduction spent solution.

PSNS 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 Lead0.1120.052 Mercury0.0600.024 Silver0.1160.048 Zinc0.4080.168 Gold0.040

(c) Electrolytic cells wet air pollution control.

PSNS 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 Lead5.5442.574 Mercury2.9701.188 Silver5.7422.376 Zinc20.2008.316 Gold1.980

(d) Electrolyte preparation wet air pollution control.

PSNS 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 Lead0.0140.007 Mercury0.0080.003 Silver0.0150.006 Zinc0.0510.021 Gold0.005

(e) Calciner wet air pollution control.

PSNS 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 Lead6.1602.860 Mercury3.3001.320 Silver6.3802.640 Zinc22.4409.240 Gold2.200

(f) Calcine quench water.

PSNS 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 Lead4.9282.288 Mercury2.6401.056 Silver5.1042.112 Zinc17.9507.392 Gold1.760

(g) Calciner stack gas contact cooling water.

PSNS 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 Lead1.1620.540 Mercury0.6230.249 Silver1.2040.498 Zinc4.2331,743 Gold0.415

(h) Condenser blowdown.

PSNS 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 Lead3.8641.794 Mercury2.0700.828 Silver4.0021.656 Zinc14.0805.656 Gold1.380

(i) Mercury cleaning bath water.

PSNS 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 Lead0.3920.182 Mercury0.2100.084 Silver0.4060.168 Zinc1.4280.588 Gold0.140

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.256

§ 421.257 - [Reserved]

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 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 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 421.257