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 Lead 0.364 0.169 Mercury 0.195 0.078 Silver 0.377 0.156 Zinc 1.326 0.546 Gold 0.130 (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 Lead 0.112 0.052 Mercury 0.060 0.024 Silver 0.116 0.048 Zinc 0.408 0.168 Gold 0.040 (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 Lead 5.544 2.574 Mercury 2.970 1.188 Silver 5.742 2.376 Zinc 20.200 8.316 Gold 1.980 (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 Lead 0.014 0.007 Mercury 0.008 0.003 Silver 0.015 0.006 Zinc 0.051 0.021 Gold 0.005 (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 Lead 6.160 2.860 Mercury 3.300 1.320 Silver 6.380 2.640 Zinc 22.440 9.240 Gold 2.200 (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 Lead 4.928 2.288 Mercury 2.640 1.056 Silver 5.104 2.112 Zinc 17.950 7.392 Gold 1.760 (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 Lead 1.162 0.540 Mercury 0.623 0.249 Silver 1.204 0.498 Zinc 4.233 1.743 Gold 0.415 (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 Lead 3.864 1.794 Mercury 2.070 0.828 Silver 4.002 1.656 Zinc 14.080 5.796 Gold 1.380 (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 Lead 0.392 0.182 Mercury 0.210 0.084 Silver 0.406 0.168 Zinc 1.428 0.588 Gold 0.140