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Tank failure & loss of fuel at a petrol station

Site assessments Remediation

When a client discovered the loss of some 900 litres of fuel while upgrading old tanks at one of their active petrol filling sites, EPS was able to assist by swiftly investigating the extent of the spill, installing the most appropriate remediation scheme for the site and ultimately avoiding a significant pollution incident in an extremely environmentally sensitive location.

  • Initial investigations found that contamination extended to depths of more than 65m below the ground surface as fuel was migrating vertically down through joints and fractures in the underlying Chalk aquifer towards groundwater which is extracted for public drinking water supply.
  • EPS promptly advised the client as the incident developed over the very busy Christmas holiday period, led negotiations with the regulators on all aspects of work and carried out the environmental investigations in order to design and install the most suitable remediation solution for the site.
  • The remedial technology used was Soil Vapour Extraction (SVE), which worked by drawing air rapidly from targeted depths in the impacted chalk to evaporate off the petrol contamination while also pulling clean air through the ground to promote natural degradation.
  • EPS successfully halted the petrol movement and then demonstrated through further extraction and monitoring, that levels in the soil had been brought down to a level where they could not cause any future impact to the Chalk water.
  • The Environment Agency’s regional groundwater specialist Mr Simon Deacon commented: “…the Environment Agency is pleased with the way Petrol Retail Client A and its consultants handled this incident, using a sustainable technology to ensure significant contamination of the Chalk Aquifer was avoided.”