40 CFR 415.344: Pretreatment standards for existing sources (PSES).

(a) Existing sources which annually introduce less than 210,000 cubic meters per year (55 million gallons per year) of chrome pigments process wastewater into a publicly owned treatment works are subject only to the standards specified in 40 CFR part 403.

(b) Except as provided in 40 CFR 403.7 and 403.13 and paragraph (a) of this section, 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 (PSES):

Subpart AH—Chrome Pigments

Pollutant or pollutant property PSES effluent limitations

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

Milligrams per liter (mg/l)

Chromium (T) 2.9 1.2

Lead (T) 3.4 1.4

Zinc (T) 2.9 1.2

In cases where POTWs find it necessary to impose mass limitations, the following equivalent mass limitations are provided as an alternate: The limitations for Chromium(T), Lead(T), and Zinc(T) are the same as specified in § 415.342