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This document provides guidance on key aspects of remediation techniques and their implementation. It briefly describes principles, the main characteristics and the advantages and limitations to be considered in the selection within an option appraisal of individual or combinations of in-situ and on-site remediation techniques, including: It follows the principles for sustainable remediation in ISO 18504. The scope of this document is restricted to the remediation of contaminated sites, i.e. where soil, or soil gas, ambient air or groundwater are contaminated. It identifies which phase/matrix can be targeted by a technique, e.g. fluid, (groundwater, gas, non-aqueous phase) or solid and which contaminant it can applied to. The document also provides information on hazards that can be associated with the implementation of a remediation. This document does not provide: