415.64—Pretreatment standards for existing sources (PSES).

(a) [Reserved]

(b) Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart and using the diaphragm cell process, 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 F—Chlor-Alkali-Diaphragm Cells

Pollutant or pollutant property	PSES effluent limitations
Pollutant or pollutant property	Maximum for any 1 day	Average of daily values for 30 consecutive days
	Milligrams per liter (mq/1)
Copper (T)	2.1	0.80
Lead (T)	2.9	1.1
Nickel (T)	1.6	0.64

Code of Federal Regulations

In cases when POTWs find it necessary to impose mass limitations, the following equivalent mass limitations are provided as an alternate: The limitations for Copper (T), Lead(T) and Nickel (T) are the same as specified in § 415.62(b) .