40 CFR Part 439, Appendix A

Ethanol 1 |

Isopropanol 1 |

Methanol 1 |

Phenol |

n-Hexane 1 |

Diethylamine 1 | Amines.

Triethylamine |

Benzene | Aromatics.

Toluene 1 |

Xylenes 1 |

Chlorobenzene |

o-Dichlorobenzene |

Chloroform 1 | Chlorinated Alkanes.

Methylene chloride 1 |

1,2-Dichloroethane 1 |

Ethyl acetate 1 | Esters.

Isopropyl acetate |

n-Amyl acetate |

n-Butyl acetate |

Methyl formate |

Tetrahydrofuran 1 | Ethers.

Isopropyl ether |

Acetone 1 | Ketones.

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.

Regulated parameters | Treatability class

Benzene |

Toluene 1 |

Xylenes |

n-Heptane | High 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 acetate | Medium 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]