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List of science reports that are relevant to the derivation of SGV, the CLEA framework reports, and assessment of risks to health from land contamination.

A note about bioaccessibility

The Environment Agency has published several research reports on oral bioaccessibility for soil contaminants and on the development of in vitro tests.  Such tests should be used cautiously in assessing risks to health since the relationship between measured bioaccessibility and the relative human biological availability / toxicity of contaminants remains uncertain.  The Environment Agency are not able to recommend any specific test.  Provided such testing has been carried out in accordance with guidelines for good practice, the results may be useful for arsenic as part of a "lines of evidence approach" to evaluating site-specific risk including the sensitivity of any quantitative risk assessment.

A "lines of evidence approach" means that no single piece of evidence, such as the outcome of an in vitro test should be solely relied on to make a decision about health risks.  But alongside other investigations and considerations, such as a greater understanding of soil chemistry, in vitro tests may inform a site-specific risk evaluation.

Published 2009

JEFFRIES, J., 2009. A review of body weight and height data used within the Contaminated Land Exposure Assessment model (CLEA). Project SC050021/ Technical Review 1. Bristol: Environment Agency. (PDF, 98KB)
Report reviewing recent information on body weights and heights for children and adults. It considers the limitations of the data and explains how we have used it to derive values for use within the CLEA model.

Published 2008

Science Report SC050021/SR7 Compilation of Data for Priority Organic Pollutants for Derivation of Soil Guideline Values (PDF, 4.6MB)
Provides a summary of recommended values for physical-chemical properties for sixty-six organic chemicals. We will use these recommended values in deriving Soil Guideline Values.

Environment Agency, 2008. Supporting spreadsheet to Science Report SC050021/SR7 Compilation of data for priority organic pollutants for derivation of Soil Guideline Values. (Excel, 92KB)
Spreadsheet containing the recommended data from Environment Agency, 2008, 'Compilation of data for priority organic pollutants for derivation of Soil Guideline Values' formated to be easily cut and pasted directly into the CLEA software chemicals database.

Published 2007

ENVIRONMENT AGENCY, 2007. Inter-laboratory comparison of in vitro bioaccessibility measurements for arsenic lead and nickel in soil, Science Report SC040060/SR2. Bristol: Environment Agency. (PDF, 816KB)
Report looking at the results different laboratories obtained when testing soil which was designed to simulate the effects of the human digestive system. A range of soils were examined for different metals and metalloids. The report discusses the variations that were found.

Published 2006

ENVIRONMENT AGENCY, 2006. Questionnaire survey on the use of In-vitro bioaccessibility in human health risk assessment, Science Report SC040060/SR1. Bristol: Environment Agency. (PDF, 775KB)
Survey looking at the experiences of local authorities on how often they have received risk assessments incorporating laboratory tests on soils designed to simulate the effects of the human digestive system. It also looks at how they treat them.

ENVIRONMENT AGENCY, 2006. Evaluation of Models for Predicting Plant Uptake of Chemicals from Soil, Report SC050021/SR. Bristol: Environment Agency (PDF, 676KB)
Report reviewing the different approaches available for modelling the uptake of organic contaminants into plants.

Published 2005

ENVIRONMENT AGENCY, 2005. Review of Building Parameters for Development of a Soil Vapour Intrusion Model, Report P5-079/PR. Bristol: Environment Agency. (PDF, 2.9MB)
Report reviewing the range of values found within UK building stock for parameters needed to model the transport of vapours from soil into buildings. It is the basis of the values we recommend for default building types in the CLEA report.

ENVIRONMENT AGENCY, 2005. International workshop on the potential use of bioaccessibility testing in risk assessment of land contamination, Science Report SC040054. Bristol: Environment Agency. (PDF, 16.5MB)
Report summarising discussions at a workshop of international experts in the field of laboratory tests on soils designed to simulate the effects of the human digestive system. It discusses recent advances and limitations of the various techniques.

ENVIRONMENT AGENCY, 2005. The UK Approach for Evaluating Human Health Risks from Petroleum Hydrocarbons in Soil, Report P5-080/TR3. Bristol: Environment Agency. (PDF, 536KB)
Report explaining how we recommend you should evaluate mixtures of total petroleum hydrocarbons when conducting a human health risk assessment. Includes a discussion of which physical-chemical properties and toxicological data you might choose to use for the various fractions and also considerations of additivity.

Published 2002

ENVIRONMENT AGENCY, 2002. Collation of Toxicological Data and Development of Guideline Values for Explosive Substances, R&D Project Record P5-036/01. Bristol: Environment Agency. (PDF, 927KB)
Report providing information relating to toxicology and physical-chemical properties of explosives and also explains how this information was derived. Of use in assessing contamination by explosives in soils.

ENVIRONMENT AGENCY, 2002. In-vitro Methods for the Measurement of the Oral Bioaccessibility of Selected Metals and Metalloids in Soils: A Critical Review, Technical Report P5-062/TR/01. Bristol: Environment Agency. (PDF, 292KB)
Report reviewing the available bioaccessibility tests for soil. These are laboratory tests designed to model how readily soil contamination from metals and metalloids may enter the digestive system. It discusses which metals have been evaluated and how well the laboratory tests have been aligned with those on animals.

ENVIRONMENT AGENCY, 2002. Measurement of the Bioaccessibility of Arsenic in UK Soils, Report P5-062/TR/02. Bristol: Environment Agency. (PDF, 850KB)
Report discussing the results of laboratory tests comparing how readily arsenic in soils from different areas of England and Wales entered models representing the human digestive system. It also discusses additional lines of analytical evidence looking at the mineralogy of the arsenic in the soil and its influence on bioaccessibility.

Contaminated Land Reports

Technical guidance on special sites. EA, 2001 (INFO-RA1d)

Technical Guidance for Local Authorities

Conceptual Site Model

Industry Profiles

SGV Reports and supplementary information for specific chemicals and groups of chemicals are available for download here.

We recommend that professionals using SGV Reports are familiar with the information in the framework reports and the introductory guide available below.   SGV Reports published before 2008 have been withdrawn.  They were prepared using previous framework guidance (R&D Publications CLR7 – 10) published in 2002, which has been superseded.

Introduction to Soil Guideline Values

These are minor changes that do not affect the calculation of Soil Guideline Values.

Soil Guideline Values

Heavy metals and other inorganic compounds



Other organic compounds

Supplementary information for the derivation of SGVs

Heavy metals and other inorganic compounds



Other organic compounds

TOX Reports describe the toxicology of specific chemicals or groups of chemicals and recommend health criteria values (HCV) for use in the derivation of Soil Guideline Values.

HCV describe the levels at which long-term human exposure to chemicals in soil is tolerable or poses a minimal risk.

TOX Reports have been prepared in accordance with the CLEA framework reports from a review of published literature and expert group evaluations.  We have closely involved the Health Protection Agency (HPA) and Food Standards Agency (FSA) in preparation of these documents.

Available TOX Reports (2009 onwards)

Heavy metals and other inorganic compounds



Other organic compounds

Older TOX Reports (prior to 2009)

EA published a new framework report for preparing TOX Reports in 2009. The following TOX Reports were published between 2002 and 2008, and follow older guidance (R&D Publication CLR9) that has now been withdrawn.  Much of the existing information is still useful for understanding the toxicity of these chemicals but care should be taken in using the derived HCV in assessing health risks from land contamination.  Assessors should consider whether more recent evaluations of the toxicity of these chemicals have been published by other authoritative organisations.

Heavy metals and other inorganic compounds

The toxicology report for lead (originally published in 2002 under the old approach) has been withdrawn. See FAQ.

Polycyclic aromatic hydrocarbons

Chlorinated solvents