Introduction. General principles for the leaching and extraction of materials. Soils. Contaminated soil. Sediments. Sewage sludges. Composts. Granular waste and industrial sludges. Waste stabilized/solidified with hydraulic binders. Construction materials. Preservative treated wood. Standardization of leaching/extraction tests. Concluding observations and discussion of potential for harmonization. Summary. Annex 1. Contact details for the group members. Annex 2. The main chapter contributors. Annex 3. Those who attended and contributed to the Network meetings. Glossary of terms. Index.