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Land contamination can affect the health of people living, working, visiting or otherwise present on a site. The risk assessment process is used to establish whether there is an unacceptable risk to humans.

Contaminated Land Exposure Assessment (CLEA)

CLEA Software and Handbook

Toxicological Reports (TOX) (INFO-RA2-2d)

Soil Guideline Values (SGVs) (INFO-RA2-2e)

Category 4 Screening Levels (C4SL)

Generic Screening Values (GAC)


General Information 

 TPH Working Group Series (TPHCWG)

Contaminated Land Reports (CLR) - All withdrawn

      • CLR7 Overview of the Development of Guideline Values and Related Research, DEFRA/EA, 2002. (INFO-RA2-2a) CLR7 has been withdrawn.
      • CLR9 Contaminants in Soils: Collation of Toxicological Data and Intake Values for Humans. Consolidated Main Report, CLR 9 DEFRA/EA, 2002. (INFO-RA2-2b). The Environment Agency completely re-wrote the old CLR9 report (now called the Human health toxicological assessment of contaminants in soil (Science Report Final SC050021/SR2)) to take account of Defra's ‘Way Forward’ exercise on Soil Guideline Values and other changes to the underlying science.
      • CLR 10 The Contaminated Land Exposure Assessment Model (CLEA): Technical Basis and Algorithms. DEFRA/EA, 2002. (INFO-RA2-2c). This has been withdrawn and rewritten as CLEA.