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ICRCL 59/83 Trigger Concentrations

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Group A - Contaminants that may pose hazards to health | Group B - Phytotoxic contaminants - but not normally hazardous to health | Group C - Organic contaminants | Notes |
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ICRCL 59/83 Trigger Concentrations

Contaminant Planned Use Trigger ? Values
(mg / kg air-dried soil)

Group A (may pose hazards to health)		 Threshold
 Action
Arsenic Domestic gardens, allotments 10 -
Parks, playing fields, open space 40 -
Cadmium Domestic gardens, allotments 3 -
Parks, playing fields, open space 15 -
Chromium
(hexavalent) (1) 		Domestic gardens, allotments 25 -
Parks, playing fields, open space No Limit No Limit
Chromium
(total)		 Domestic gardens, allotments 600 -
Parks, playing fields, open space 1,000 -
Lead Domestic gardens, allotments 500 -
Parks, playing fields, open space 2,000 -
Mercury Domestic gardens, allotments 1 -
Parks, playing fields, open space 20 -
Selenium Domestic gardens, allotments 3 -
Parks, playing fields, open space 6 -

Group B (Phytotoxic - but not normally hazardous to health)		 Threshold
 Action
Boron
(water-soluble) (3) 		Any uses where plants are grown (2) (6) 3 -
Copper (4) (5) Any uses where plants are grown (2) (6) 130 -
Nickel (4) (5) Any uses where plants are grown (2) (6) 70 -
Zinc (4) (5) Any uses where plants are grown (2) (6) 300 -

Group C - (Organic contaminants)		 Threshold
 Action
Polyaromatic
hydrocarbons (7) (8) 		Domestic gardens, allotments, play areas 50 500
Landscaped areas, buildings, hard cover 1,000 10,000
Phenols Domestic gardens, allotments, 5 200
Landscaped areas, buildings, hard cover 5 1,000
Cyanide
(free)		 Domestic gardens, allotments, landscaped areas 25 500
Buildings, hard cover 100 500
Cyanide
(complex)		 Domestic gardens, allotments 250 1,000
Landscaped areas 250 5,000
Buildings, hard cover 250 No Limit
Thiocyanate All proposed uses 50 No Limit
Sulphate Domestic gardens, allotments, landscaped areas 2,000 10,000
Buildings (9) 2,000 50,000
Hard cover 2,000 No Limit
Sulphide All proposed uses 250 1,000
Sulphur All proposed uses 5,000 20,000
Acidity Domestic gardens, allotments, landscaped areas pH<5 pH<3
Buildings, hard cover No Limit No Limit

?

Notes :-

No limit - The contaminant does not expose a particular hazard for this use.

  2. Soluble hexavalent Chromium extracted by 0.1m HCL at 37 o ; solution adjusted to pH 1.0 if alkaline substances present.
  3. Pure rainwater is slightly acidic, with a pH of about 6.5 (due to dissolved Carbon Dioxide). The soil pH value is assumed to be about 6.5, and should be maintained at this value. If the pH falls the toxic effects of uptake of these elements will be increased.
  4. Determined by the standard ADAS method (soluble in hot water).
  5. Total concentration (extractable by HN03/HCl04.
  6. The phytotoxic effects of Copper, Nickel and Zinc may be additive. The trigger values given here are those applicable to the 'worst-case', phytotoxic effects may occur at these concentrations on acid sandy soils. In neutral (pH=7) or alkaline soils, phytotoxic effects are unlikely at these concentrations.
  7. Grass is more resistant than most other plants to phytotoxic effects, hence its growth may not be adversely affected at these conditions.
  8. Used as a marker for Coal Tar. See CIRIA, 1988 Annex 1.
  9. See CIRIA, 1988 for details of analytical methods.
  10. See BRE Digest 250 : 'Concrete in sulphate-bearing soils and groundwater.

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