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) Primary mills, carbon and specialty —(1) Without scarfing. Subpart G 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 0.150 0.0561 O&G 0.0374 pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0. (2) With scarfing. Subpart G 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 0.221 0.0830 O&G 0.0553 pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0. (b) Section mills —(1) Carbon. Subpart G 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 0.357 0.134 O&G 0.0894 pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0. (2) Specialty. Subpart G 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 0.224 0.0841 O&G 0.0561 pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0. (c) Flat mills —(1) Hot strip and sheet mills, carbon and specialty. Subpart G 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 0.427 0.160 O&G 0.107 pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0. (2) Carbon plate mills. Subpart G 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 0.227 0.0851 O&G 0.0568 pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0 (3) Specialty plate mills. Subpart G 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 0.100 0.0376 O&G 0.0250 ( 1 ) pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0 (d) Pipe and tube mills, carbon and specialty. Subpart G 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 0.212 0.0795 O&G 0.0530 pH ( 1 ) ( 1 ) 1 Within the range of 6.0 to 9.0