40 CFR § 415.644 - Pretreatment standards for existing sources (PSES).

(a) Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart and producing cadmium pigments 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 BL—Cadmium 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)
Cadmium (T)	0.84	0.28
Selenium (T)	1.1	0.40
Zinc (T)	0.18	0.10

In cases where POTWs find it necessary to impose mass limitations, the following equivalent mass limitations are provided as an alternate: The limitations for cadmium (T), selenium (T), and zinc (T) are the same as specified in § 415.642(a).

(b) Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart and producing cadmium salts 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 BL—Cadmium Salts

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)
Cadmium (T)	0.84	0.28
Selenium (T)	1.1	0.40
Zinc (T)	0.18	0.10

In cases where POTWs find it necessary to impose mass limitations, the following equivalent mass limitations are provided as an alternate: The limitations for cadmium (T), selenium (T), and zinc (T) are the same as specified in § 415.642(b).