Defra has not sponsored any research directly in these areas. However, the Environment Agency, a Defra-sponsored non-departmental public body, has undertaken a number of research projects that have considered the impact and attenuation of oil spills on soil and groundwater. In particular:
The Natural Attenuation of Petroleum Hydrocarbons and Chlorinated Solvents in Groundwater, report P 305 dated 1999
Guidance on the assessment and monitoring of natural attenuation of contaminants in groundwater, report number 95, dated 2000.
These reports are available from the Environment Agency via the following internet links: