This publication draws together the experience of Member States in the evaluation, management and remediation of legacy trench sites. It describes the overall process necessary to facilitate such projects. The publication provides the reader with an understanding of how to characterize, assess and potentially remediate such sites as well as providing guidance on management aspects such as decision making and engaging with stakeholders. A key aim is to highlight specific issues associated with these sites, which make them different from other contaminated sites, and to direct the reader to relevant guidance. Case studies to illustrate legacy trench sites, which either have been or are in various stages of assessment and remediation are also presented. Relevant experience and lessons learned for these sites is embedded throughout the publication.