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 for metal preparation operations and for coating operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT): Subpart A—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 16.82 3.41 6.81 1.38 Lead 6.01 1.21 5.21 1.06 Nickel 56.46 11.43 40.05 8.11 Zinc 53.26 10.78 22.43 4.54 Aluminum 182.20 36.87 74.47 15.07 Iron 112.12 22.69 56.06 11.34 Oil and grease 800.84 162.10 480.51 97.23 TSS 1642.00 332.20 800.90 162.00 pH ( 1 ) ( 1 ) ( 1 ) ( 1 ) English Units—pounds per 1 million ft 2 of area processed or coated Chromium 3.45 0.07 1.40 0.29 Lead 1.23 0.25 1.07 0.22 Nickel 11.57 2.34 8.20 1.66 Zinc 10.91 2.21 4.60 0.93 Aluminum 37.32 7.55 15.26 3.09 Iron 22.96 4.65 11.48 2.32 Oil and grease 164.03 33.19 98.42 19.92 TSS 337.00 68.10 164.00 33.20 pH ( 1 ) ( 1 ) ( 1 ) ( 1 ) 1 Within the range 7.5 to 10.0 at all times. [47 FR 53184, Nov. 24, 1982, as amended at 50 FR 36543, Sept. 6, 1985]