Pretreatment standards for existing sources.

(a) Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. Subpart C—PSES Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average Milligrams per liter (mg/l) Chromium 0.42 0.17 Lead 0.15 0.13 Nickel 1.41 1.00 Zinc 1.33 0.56 (b) In cases where POTW find it necessary to impose mass pretreatment standards the following equivalent mass standards are provided: Subpart C—PSES 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 0.53 6.62 0.22 Lead 5.84 0.19 5.06 0.16 Nickel 54.85 1.78 38.9 1.26 Zinc 51.74 1.68 21.79 1.71 English units—pounds per 1 million ft 2 of area processed or coated Chromium 3.35 0.11 1.36 0.05 Lead 1.20 0.04 1.04 0.03 Nickel 11.24 0.37 7.97 0.25 Zinc 10.6 0.35 4.46 0.35 [47 FR 53184, Nov. 24, 1982, as amended at 50 FR 36544, Sept. 6, 1985]