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ICRCL 59/83 Trigger Concentrations

Keywords :-

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.

Soluble hexavalent Chromium extracted by 0.1m HCL at 37 ^o ; solution adjusted to pH 1.0 if alkaline substances present.
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.
Determined by the standard ADAS method (soluble in hot water).
Total concentration (extractable by HN0₃/HCl0₄.
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.
Grass is more resistant than most other plants to phytotoxic effects, hence its growth may not be adversely affected at these conditions.
Used as a marker for Coal Tar. See CIRIA, 1988 Annex 1.
See CIRIA, 1988 for details of analytical methods.
See BRE Digest 250 : 'Concrete in sulphate-bearing soils and groundwater.

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URL: http://www.ContaminatedLAND.co.uk/std-guid/icrcl-l.htm
[Page created: 11th Nov 65, Last Update: 16th May 2000]
Copyright © 1996, Layla Resources Ltd, All Rights Reserved

Contaminant	Planned Use	Trigger Values (mg / kg air-dried soil)
Group A (may pose hazards to health)		Threshold	Action
Arsenic	Domestic gardens, allotments	10	-
Arsenic	Parks, playing fields, open space	40	-
Cadmium	Domestic gardens, allotments	3	-
Cadmium	Parks, playing fields, open space	15	-
Chromium (hexavalent) (1)	Domestic gardens, allotments	25	-
Chromium (hexavalent) (1)	Parks, playing fields, open space	No Limit	No Limit
Chromium (total)	Domestic gardens, allotments	600	-
Chromium (total)	Parks, playing fields, open space	1,000	-
Lead	Domestic gardens, allotments	500	-
Lead	Parks, playing fields, open space	2,000	-
Mercury	Domestic gardens, allotments	1	-
Mercury	Parks, playing fields, open space	20	-
Selenium	Domestic gardens, allotments	3	-
Selenium	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
Polyaromatic hydrocarbons (7) (8)	Landscaped areas, buildings, hard cover	1,000	10,000
Phenols	Domestic gardens, allotments,	5	200
Phenols	Landscaped areas, buildings, hard cover	5	1,000
Cyanide (free)	Domestic gardens, allotments, landscaped areas	25	500
Cyanide (free)	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
Acidity	Buildings, hard cover	No Limit	No Limit