Toxicity Characteristic Constituents

                                                        Level, mg/L           pounds

 Arsenic                                                   5.0                           1

Barium                                                 100.0                      1000

Benzene                                                  0.5                          10

Cadmium                                               1.0                          10

Carbon Tetrachloride         0.5                          10

Chlordane                                              0.03                          1

Chlorobenzene                                   100.0                        100

Chloroform                                             6.0                          10

Chromium                                              5.0                          10

o-Cresol                                               200.0                      1000

m-Cresol                                              200.0                      1000

p-Cresol                                               200.0                      1000

Cresol                                                  200.0                      1000

2,4-D                                                      10.0                       100

1,4-Dichlorobenzene                               7.5                       100

1,2-Dichloroethane                                 0.5                        100

1,1-Dichloroethylene                               0.7                        100

2,4-Dinitrotoluene                                   0.13                        10

Endrin                                                      0.02                         1

Heptachlor (and Hypoxide)                     0.008                       1

Hexachlorobenzene                                0.13                        10

Hexachloro-1,3-butadiene                       0.5                           1

Hexachloroethane                                   3.0                        100

Lead                                                         5.0                          *

Lindane                                                    0.4                           1

Mercury                                                    0.2                            1

Methoxychlor                                          10.0                           1

Methyl ethyl ketone                               200.0                     5000

Nitrobenzene                                            2.0                     1000

Pentachlorophenol                                100.0                       10

Pyridine                                                       5.0                   1000

Selenium                                                     1.0                       10

Silver                                                           5.0                         1

Tetrachloroethylene                                   0.7                       100

Toxaphene                                                 0.5                           1

Trichloroethylene                                        0.5                       100

2,4,5-Trichlorophenol                               400.0                        10

2,4,6-Trichlorophenol                                   2.0                       10

2,4,5-TP (Silvex)                                             1.0                     100

Vinyl chloride                                                0.2                       1

* not available  The regulatory level has been set at ~100 x the chronic toxicity level.