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) Subpart K—Concentrate Digestion Wet Air Pollution Control. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of concentrate digested Lead 2.612 1.244 Zinc 9.080 3.794 Ammonia (as N) 829.000 364.500 Fluoride 217.700 124.400 Total suspended solids 255.000 121.300 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (b) Subpart K—Solvent Extraction Raffinate. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of concentrate digested Lead 3.888 1.851 Zinc 13.520 5.647 Ammonia (as N) 1,233.000 542.500 Fluoride 324.000 185.100 Total Suspended Solids 379.500 189.500 pH ( 1 ) ( 1 ) Within the range of 7.5 to 10.0 at all times. (c) Subpart K—Solvent Extraction Wet Air Pollution Control. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of concentrate digested Lead 1.032 .491 Zinc 3.586 1.498 Ammonia (as N) 327.400 143.900 Fluoride 85.960 49.120 Total suspended solids 100.700 47.890 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (d) Subpart K—Precipitation and Filtration. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of concentrate digested Lead 5.750 2.738 Zinc 19.990 8.350 Ammonia (as N) 1,825.000 802.200 Fluoride 479.100 273.800 Total suspended solids 561.300 267.000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (e) Subpart K—Precipitation and Filtration Wet Air Pollution Control. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of concentrate digested Lead 26.680 12.700 Zinc 92.730 38.740 Ammonia (as N) 8,466.000 3,722.000 Fluoride 2,223.000 1,270.000 Total suspended solids 2,604.000 1,239.000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (f) Subpart K—Tantalum Salt Drying. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum salt dried Lead 25.430 12.110 Zinc 88.390 36.930 Ammonia (as N) 8,070.000 3,548.000 Fluoride 2,119.000 1,211.000 Total suspended solids 2,482.000 1,181.000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (g) Subpart K—Oxides Calcining Wet Air Pollution Control. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of columbium-tantalum oxide dried Lead 16.140 7.685 Zinc 56.100 23.440 Ammonia (as N) 5,122.000 2,252.000 Fluoride 1,345.000 768.500 Total suspended solids 1,576.000 749.200 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (h) Subpart K—Reduction of Tantalum Salt to Metal. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum salt reduced Lead 69.750 33.220 Zinc 242.500 101.300 Ammonia (as N) 22,140.000 9,732.000 Fluoride 5,813.000 3,322.000 Total suspended solids 6,809.000 3,239.000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum salt reduced Lead .858 .409 Zinc 2.983 1.246 Ammonia (as N) 272.400 119.700 Fluoride 71.510 40.860 Total suspended solids 83.770 39.840 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (j) Subpart K—Tantalum Powder Wash. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of tantalum power washed Lead 8.582 4.087 Zinc 29.830 12.470 Ammonia (as N) 2,724.000 1,198.000 Fluoride 715.200 408.700 Total suspended solids 837.800 398.500 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. (k) Subpart K—Consolidation and Casting Contact Cooling. BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated Lead .000 .000 Zinc .000 .000 Ammonia (as N) .000 .000 Fluoride .000 .000 Total suspended solids .000 .000 pH ( 1 ) ( 1 ) 1 Within the range of 7.5 to 10.0 at all times. [49 FR 8817, Mar. 8, 1984, as amended at 49 FR 29795, July 24, 1984; 50 FR 12253, Mar. 28, 1985]