Groundwater Remediation
PROJECT: Remediation of Groundwater Contaminated by Diesel
CLIENT: Confidential
DURATION: 13 years
COST RANGE: £1,500,000 to £2,000,000
STATUS: Completed.
WORKS:
- Design of remediation system based upon pilot study in the field.
- Installation of a number of boreholes to 40 metres depth with permanent buried pipework and permanent reinstatement.
- Installation and operation of an automated (with remote web access), programmable pumping regime (up to 125m3/hr) system with treatment to soakaways.
- Commissioning, optimisation, monitoring and operation of the remediation scheme in accordance with Environmental Permit.
- System decommissioned with removal of tanks and associated infrastructure.
The site was situated in an area of high environmental sensitivity on the boundary of an outer source protection zone. Large seasonal groundwater fluctuations were encountered in the boreholes, with the water table falling on average around 10cm daily during summer and autumn. The remedial objectives were the removal of of recoverable NAPL mass from the aquifer to reduce the risk of future migration and the monitoring of the aquifer groundwater to demonstrate that the risks to receptors were stable or reducing.
NAPL was recovered from the abstraction wells using a technique of groundwater pumping to lower the head in the aquifer together with total fluids pumping using top filling pneumatic pumps. A relatively low vacuum to the well head enhanced NAPL recovery during the pilot study and was incorporated into the full scale design.
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For further information and informal advice contact mail@trm-ltd.com.