40 CFR 420.125: Pretreatment standards for existing sources (PSES).

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.

(a) Galvanizing, terne coating and other coatings—(1) Strip, sheet, and miscellaneous products.

Subpart L

Pretreatment standards for existing sources Pollutant or pollutant property

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

Lead 0.00113 0.000376

Zinc 0.00150 0.000500

Chromium (hexavalent) 1 0.000150 0.0000501

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property Pretreatment standards for existing sources

Maximum for any 1 day Average of daily values for 30 consecutive days

kg/kkg (pounds per 1,000 lb) of product

Lead 0.00451 0.00150

Zinc 0.00601 0.00200

Chromium (hexavalent) 1 0.000601 0.000200

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

(2) [Reserved]

(c) Fume scrubbers.

Subpart L

Pollutant or pollutant property Pretreatment standards for existing sources

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg per day

Lead 0.0368 0.0123

Zinc 0.0491 0.0164

Chromium (hexavalent) 1 0.00490 0.00163

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above.