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 must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT): Subpart I—Metallurgical Acid Plant Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds of 100% sulfuric acid capacity Cadmium 0.180 0.090 Copper 5.000 2.000 Lead 1.800 0.790 Zinc 3.600 0.900 Fluoride 1 212.800 121.000 Molybdenum 1 40.180 20.790 Total suspended solids 304.000 152.000 pH 2 2 1 For Molybdenum Acid Plants Only. 2 Within the range of 6.0 to 9.0 at all times. [50 FR 38342, Sept. 20, 1985; 50 FR 52776, Dec. 26, 1985]