Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

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. (a) Galvanizing, terne coating, and other coatings —(1) Strip, sheet, and miscellaneous products. Subpart L Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Average of daily values for 30 consecutive days Kg/kkg (pounds per 1,000 lb) of product TSS 0.175 0.0751 O&G 0.0751 0.0250 Lead 0.00113 0.000376 Zinc 0.00150 0.000500 Chromium (hexavalent) 1 0.000150 0.0000501 pH ( 2 ) ( 2 ) 1 The limitations for hexavalent chromium shall apply only to galvanizing operations which discharge wastewaters from the chromate rinse step. 2 Within the range of 6.0 to 9.0. (2) [Reserved] (b) Galvanizing and other coatings —(1) Wire products and fasteners. Subpart L Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Average of daily values for 30 consecutive days Kg/kkg (pounds per 1,000 lb) of product TSS 0.701 0.300 O&G 0.300 0.100 Lead 0.00451 0.00150 Zinc 0.00601 0.00200 Chromium (hexavalent) 1 0.000600 0.000200 pH ( 2 ) ( 2 ) 1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step. 2 Within the range of 6.0 to 9.0. (2) [Reserved] (c) Fume scrubbers. Subpart L Pollutant or pollutant property BPT effluent limitations Maximum for any 1 day Average of daily values for 30 consecutive days Kg per day TSS 38.1 16.3 O&G 16.3 5.45 Lead 0.245 0.0819 Zinc 0.327 0.109 Chromium (hexavalent) 1 0.0327 0.0109 pH ( 2 ) ( 2 ) 1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step. 2 Within the range of 6.0 to 9.0. The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above. [47 FR 23284, May 27, 1982; 47 FR 41739, Sept. 22, 1982, as amended at 49 FR 21036, May 17, 1984]