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The Kelly Indices


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Cyanides
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Kelly Indices (Former GLC) Guidelines for Contaminated Soils
specifically developed for gasworks sites in London:
Suggested Range of Values (mg/kg on air-dried soils, except for pH)

ParameterUncontaminatedSlight ContaminationContaminatedHeavy ContaminationUnusually Heavy Contamination
pH (acid) 6-7 5-6 4-5 2-4 < 2
pH (alkaline) 7-8 8-9 9-10 10-12 > 12
Antimony 0-30 30-50 50-100 100-500 > 500
Arsenic 0-30 30-50 50-100 100-500 > 500
Boron (available)0-2 2-5 5-50 50-250 > 250
Barium 0-500 500-1000 1000-2000 2000-1.0% > 1.0%
Beryllium 0-5 5-10 10-20 20-50 > 50
Cadmium 0-1 1-3 3-10 10-50 > 50
Chromium 0-100 100-200 200-50 500-2500 > 2500
Copper (available)0-100 100-200 200-500 500-2500 > 2500
Cyanide (free)0-1 1-5 5-50 50-100 > 100
Cyanide 0-5 5-25 25-250 250-500 > 500
Ferricyanide 0-100 100-500 500-1000 1000-5000 > 5000
Lead 0-500 500-1000 1000-2000 200-10,000 > 10,000
Lead (available) 0-200 200-500 500-1000 1000-5000 > 5000
Mercury 0-1 1-3 3-10 10-50 > 50
Manganese 0-500 500-1000 1000-2000 2000-10,000 > 10,000
Magnesium 0-500 500-1000 1000-2000 2000-1.0% > 1.0%
Nickel (available)0-20 20-50 50-200 200-1000 > 1000
PAHs (Coal Tar)0-500 500-1000 1000-2000 2000-1.0% > 1.0%
Phenol 0-2 2-5 5-50 50-250 > 250
Selenium 0-1 1-3 3-10 10-50 > 50
Sulphate 0-2000 2000-5000 5000-1.0% 1.0%-5.0% > 5.0%
Sulphur (free)0-100 100-500 500-1000 1000-5000 > 5000
Sulphide 0-10 10-20 20-100 100-500 > 500
Thiocyanate 0-10 10-50 50-100 100-500 > 500
Toluene extract0-5000 5000-1.0% 1.0-5.0% 5.0-25.0% > 25.0%
Vanadium 0-100 100-200 200-500 500-2500 > 2500
Zinc (available)0-250 250-500 500-1000 1000-5000 > 5000
Zinc (equivalent)0-250 250-500 500-2000 2000-1.0% > 1.0%

Guidelines for classification of contaminated soils - suggested range of values (parts per million) on air dried soils

Note - added to guidelines after publication of ICRCL 59/83:

Guidance for Heavy Metal Contaminants should be sought from parameters listed in ICRCL 59/83

Source: Site investigation and materials problems, Proc. Conference on Reclamation of Contaminated Land, Eastbourne, UK, October 1979 (Society of the Chemical Industry, London 1980).


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