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Appendix C: Toxicity Guidelines

The toxicity guidelines in Table C1 have been derived on the basis of ADI values for the substances listed. In accordance with section 4.2.1, the substances that have an ADI of ≤ 0.02 mg/kg/day or are carcinogenic are high-concern contaminants. Substances with an ADI between 0.02 and 0.2 mg/kg/day are medium-concern contaminants, and substances with an ADI greater than 0.2 mg/kg/day are low-concern contaminants.

Table C1: Examples of contaminants with high, medium and low concern for human health - soil ingestion

High-concern contaminants Medium-concern contaminants Low-concern contaminants

Aldrin

Boron

Chromium III

Arsenic

Cobalt

Iron

Benzene

Copper

Zinc

Benzo(a)pyrene

Fluoride

  

Chlordane

Formaldehyde

  

Chromium VI

Glyphosate (Roundup)

  

Cyanide and compounds

Methanol

  

DDT

Permethrin

  

Diazinon

Phenol

  

Dieldrin

Styrene

  

2,4-Dichlorophenoxyacetic Acid (2,4-D)

Tin and compounds

  

Dioxin

   

Endrin

   

Ethylbenzene

    

Lead

    

Lindane

    

Malathion

    

Mercury

    

Naphthalene

    

Nickel

    

Pentachlorophenol

    

Polychlorinated biphenyls (PCBs)

    

Tetrachloroethane

    

Tetrachloroethylene (PCE)

    

Trichloroethylene (TCE)

    

Toluene

    

Vinyl chloride

    

Xylenes

    

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