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----------------------------------------------------------------------------------------------------------------
Maximum for any 1 day Maximum for monthly
------------------------ average
Pollutant or pollutant property -----------------------
Metal Coating Metal Coating
preparation operation preparation operation----------------------------------------------------------------------------------------------------------------
Metric units--mg/m\2\ of area processed or
coated
-----------------------------------------------Chromium........................................................ 16.82 3.41 6.81 1.38Lead............................................................ 6.01 1.21 5.21 1.06Nickel.......................................................... 56.46 11.43 40.05 8.11Zinc............................................................ 53.26 10.78 22.43 4.54Aluminum........................................................ 182.20 36.87 74.47 15.07Iron............................................................ 112.12 22.69 56.06 11.34Oil and grease.................................................. 800.84 162.10 480.51 97.23TSS............................................................. 1642.00 332.20 800.90 162.00pH.............................................................. (\1\) (\1\) (\1\) (\1\)
-----------------------------------------------
English Units--pounds per 1 million ft\2\ of
area processed or coated
-----------------------------------------------Chromium........................................................ 3.45 0.07 1.40 0.29Lead............................................................ 1.23 0.25 1.07 0.22Nickel.......................................................... 11.57 2.34 8.20 1.66Zinc............................................................ 10.91 2.21 4.60 0.93Aluminum........................................................ 37.32 7.55 15.26 3.09Iron............................................................ 22.96 4.65 11.48 2.32Oil and grease.................................................. 164.03 33.19 98.42 19.92TSS............................................................. 337.00 68.10 164.00 33.20pH.............................................................. (\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]