Potential Problem    Units      Degree of Restriction on Use
                            ______________________________________
                               None        Slight to      Severe
                                           Moderate

Physical Suspended Solids mg/l <50 50 100> 100 Chemical pH <7.0 7.0 8.0> 8.0 Dissolved Solids mg/l <500 500 2000> 2000 Manganese mg/l <0.1 0.1 0.5> 1.5 Iron mg/l <0.1 0.1 1.5> 1.5 Hydrogen Sulphide mg/l <0.5 0.5 2.0> 2.0 Biological maximum <10 000 10 000 50 000> 50 000 Bacterial number/ml populations

Source: Adapted from Nakayama (1982).

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