Effluent limitations 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: Subpart C—BPT Effluent Limitations Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average Metal preparation Coating operation Metal preparation Coating operation Metric units—mg/m 2 of area processed or coated Chromium 16.34 6.32 6.63 2.56 Lead 5.84 2.26 5.06 1.96 Nickel 54.85 21.21 38.90 15.04 Zinc 51.73 20.01 21.79 8.43 Aluminum 176.98 68.44 72.35 27.98 Iron 47.85 18.50 24.51 9.48 Oil and grease 777.92 300.84 466.76 108.50 TSS 1,594.74 616.68 777.92 300.82 pH ( 1 ) ( 1 ) ( 1 ) ( 1 ) English units—pounds per 1 million ft 2 of area processed or coated Chromium 3.35 1.30 1.37 0.53 Lead 1.20 0.47 1.04 0.40 Nickel 11.24 4.35 7.97 3.08 Zinc 10.6 4.10 4.46 1.73 Aluminum 36.25 14.02 14.82 5.73 Iron 9.80 3.79 5.02 1.94 Oil and grease 159.33 61.61 95.60 36.97 TSS 326.62 126.33 159.33 61.61 pH ( 1 ) ( 1 ) ( 1 ) ( 1 ) 1 Within the range 7.5 to 10.0 at all times.