Dual Phase Extraction & BioSparging – Hampshire

A loss of 2000 litres of heating oil occurred adjacent to a grade A chalk stream in Hampshire. The property is located on a chalk stream flood plain. The flint gravels underlying the site allowed the rapid migration of the oil to the chalk stream, which runs through the garden of the property.
Ecologia undertook a detailed survey to assess the spread of the contamination and to delineate the plume. The plume was found to have migrated beneath an engineered section of the river to the opposite side. Free product was also found to have migrated beneath a listed building which precluded excavation of the contaminants. A traditional dual phase extraction system would not be effective in the highly permeable gravels, so the development of an innovative technique was required.

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