The technical framework of our TOX guidance report (Final SC050021/SR2) and CLEA report (Final SC050021/SR3) is complete and the approach is consistent with that agreed by Defra and the other government agencies.

We want to make our guidance easy to use and have taken into account comments received  on these reports during a three-month evaluation period. You can download a summary of the amendments made to the CLEA framework reports from the link below.

• Human health toxicological assessment of contaminants in soil (Science Report Final SC050021/SR2) (PDF, 718KB)
  This report describes the technical principles and framework we use to derive Health Criteria Values.
• Updated technical background to the CLEA model (Science Report Final SC050021/SR3) (PDF, 1.60MB)
  This report describes the technical background to the CLEA model. It also sets out the underlying assumptions that we have made to predict exposure for three standard land use scenarios (residential, allotments and commercial).
• Changes to the CLEA framework (PDF, 118KB)
• CLEA framework: errata (PDF, 14KB)
  Minor changes to the CLEA framework reports. These do not affect calculation of assessment criteria.