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) Tin smelter SO 2 scrubber. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of crude tapped tin metal produced Arsenic 19.220 8.554 Lead 3.863 1.840 Iron 11.040 5.611 Tin 3.495 2.024 Total suspended solids 377.100 179.400 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (b) Dealuminizing rinse. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of dealuminized scrap produced Lead 0.015 0.007 Cyanide (total) 0.010 0.004 Fluoride 1.225 0.700 Tin 0.013 0.008 Total suspended solids 1.435 0.683 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (c) Tin mud acid neutralization filtrate. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of neutralized, dewatered tin mud produced Lead 2.120 1.009 Cyanide (total) 1.464 0.606 Fluoride 176.600 100.400 Tin 1.918 1.110 Total suspended solids 206.900 98.420 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (d) Tin hydroxide wash. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tin hydroxide washed Lead 5.020 2.391 Cyanide (total) 3.466 1.434 Fluoride 418.400 237.900 Tin 4.542 2.630 Total suspended solids 490.100 233.100 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (e) Spent electrowinning solution from new scrap. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of cathode tin produced Lead 7.056 3.360 Cyanide (total) 4.872 2.016 Fluoride 588.000 334.300 Tin 6.384 3.696 Total suspended solids 688.800 327.600 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (f) Spent electrowinning solution from municipal solid waste. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of MSW scrap used as raw material Lead 0.050 0.024 Cyanide (total) 0.035 0.014 Fluoride 4.165 2.368 Tin 0.045 0.026 Total suspended solids 4.879 2.321 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (g) Tin hydroxide supernatant from scrap. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tin metal recovered from scrap Lead 23.370 11.130 Cyanide (total) 16.140 6.677 Fluoride 1,947.000 1,107.000 Tin 21.140 12.240 Total suspended solids 2,281.000 1,085.000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (h) Tin hydroxide supernatant from plating solutions and sludges. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tin metal recovered from plating solutions and sludges Lead 48.30 23.00 Cyanide (total) 33.35 13.80 Fluoride 4,025.00 2,289.00 Tin 43.70 25.30 Total suspended solids 4,715.00 2,243.00 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (i) Tin hydroxide filtrate. BPT Limitations for the Secondary Tin Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tin metal produced Lead 10.520 5.009 Cyanide (total) 7.263 3.005 Fluoride 876.500 498.400 Tin 9.517 5.510 Total suspended solids 1,027.000 488.400 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times.