U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jun 14, 2024

§ 439.16 - 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 must continue achieving the standards for cyanide specified in paragraph (c) of this section and must achieve the following standards by September 21, 2001:

Pretreatment Standards (PSES)

Regulated
parameter
Maximum daily 1 Maximum monthly average 1
Ammonia (as N) 284.129.4
Acetone20.78.2
4-methyl-2-pentanone20.78.2
Isobutyraldehyde20.78.2
n-Amyl acetate20.78.2
n-Butyl acetate20.78.2
Ethyl acetate20.78.2
Isopropyl acetate20.78.2
Methyl formate20.78.2
Isopropyl ether20.78.2
Tetrahydrofuran9.23.4
Benzene3.00.7
Toluene0.30.2
Xylenes3.00.7
n-Heptane3.00.7
n-Hexane3.00.7
Methylene chloride3.00.7
Chloroform0.10.03
1,2-dichloroethane20.78.2
Chlorobenzene3.00.7
o-Dichlorobenzene20.78.2
Diethyl amine255.0100.0
Triethyl amine255.0100.0

1 mg/L (ppm)

2 Not applicable to sources that discharge to a POTW with nitrification capability.

(b) Sources that discharge to a POTW with nitrification capability (defined at § 439.1(i)) are not required to achieve the pretreatment standard for ammonia (as N).

(c) The limitations for cyanide are the same as specified in § 439.12(e), (f) and (g).

[68 FR 12272, Mar. 13, 2003]