1. Regulations
  2. title 40
  3. chapter I-i30
  4. part 421
  5. subpart W
  6. § 421.253

View all text of Subpart W [§ 421.250 - § 421.257]

§ 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