Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024
Appendix Appendix A - Appendix A to Part 439—Tables

Table 1—Surrogate Parameters for Direct Dischargers

[Utilizing biological treatment technology]

Regulated parameters Treatability class
Amyl alcoholAlcohols.
Ethanol 1
Isopropanol 1
Methanol 1
Phenol
Isobutyraldehyde 1Aldehydes.
n-Heptane 1Alkanes.
n-Hexane 1
Diethylamine 1Amines.
Triethylamine
BenzeneAromatics.
Toluene 1
Xylenes 1
Chlorobenzene
o-Dichlorobenzene
Chloroform 1Chlorinated Alkanes.
Methylene chloride 1
1,2-Dichloroethane 1
Ethyl acetate 1Esters.
Isopropyl acetate
n-Amyl acetate
n-Butyl acetate
Methyl formate
Tetrahydrofuran 1Ethers.
Isopropyl ether
Acetone 1Ketones.
4-Methyl-2-pentanone (MIBK)
Ammonia (aqueous)Miscellaneous. 2
Acetonitrile
Methyl Cellosolve
Dimethyl Sulfoxide

1 These parameters may be used as a surrogate to represent other parameters in the same treatability class.

2 Surrogates have not been identified for the “Miscellaneous” treatability class.

Table 2—Surrogate Parameters for Indirect Dischargers (Utilizing Steam Stripping Treatment Technology)

Regulated parameters Treatability class
Benzene
Toluene 1
Xylenes
n-HeptaneHigh strippability.
Chloroform 1
Methylene chloride 1
Chlorobenzene
Ammonia (aqueous)
Diethyl amine
Triethyl amine
Acetone 1
4-methyl-2-pentanone
n-Amyl acetate
n-Butyl acetate
Ethyl acetateMedium strippability.
Isopropyl acetate
Methyl formate
Isopropyl ether
Tetrahydrofuran 1
1,2-dichloroethane
o-Dichlorobenzene

1 These parameters may be used as a surrogate to represent other parameters in the same treatability class.

[63 FR 50437, Sept. 21, 1998; 64 FR 10393, Mar. 4, 1999, as amended at 68 FR 12275, Mar. 13, 2003]
source: 48 FR 49821, Oct. 27, 1983, unless otherwise noted.