Either dirt, concrete or other constructed embankments that are commonly employed for secondary containment or drainage diversion purposes at oil storage or related operations
HM Government, Strategic National Guidance, The Decontamination of Buildings, Infrastructure and Open Environment Exposed to Chemical, Biological, Radiological or Nuclear Materials, Appendix B: Glossary, Produced by the Food and Environment Research Agency on behalf of: The Cabinet Office, Department for Communities and Local Government, Department for Environment, Food and Rural Affairs, The Home Office, The Northern Ireland Executive, The Scottish Government and The Welsh Assembly Government, London, UK 2011. https://update.cabinetoffice.gov.uk/sites/default/ files/resources/CBRN-StrategicNationalGuidance.pdf , (Decont of build, infrastructure & open Env expos to CBRNE mtrls - Brit) {588}