Spill Clean Up & Remediation
A spill often requires an initial emergency response, particularly where it has entered a watercourse (see our Emergency Spill Response page). However large spills, or even small spills going undetected over a period of time, can result in residual contamination that can present risks to both environmental and human receptors. If left unattended, this can result in long term liabilities to the site owner for soil and groundwater contamination.
To assess and evaluate the environmental impact of residual contamination will typically involve a staged approach of inspection, investigation and risk assessment (see our Spill Impact Assessment page).
The Darcy team of geo-environmental specialists and chemists are ideally placed to provide an assessment of the broader environmental spill impacts and, if necessary, to design and implement a remediation strategy.
Remediation Strategy Design and Implementation
Once the degree and type of contamination and associated environmental risks have been identified, a proposal can be formulated to offer the most appropriate method of dealing with the residual contamination. Regulatory agreement or approval may be necessary prior to the clean-up operations. A description of the works with specifications, drawings and method statements indicating how the work should be undertaken are prepared.
Darcy has the capability to provide remediation solutions which may include:
- Bunding and capping, if contamination is to be contained.
- Soil washing in-situ or ex-situ by passing a flow of water and other media through it until contamination is removed, upon which the soil can be returned or disposed of to land fill.
- Air sparging - injection of air below the water table to bring contaminant to the surface for treatment.
- Pumping and treatment of contaminated water gathered from boreholes or trenches.
- Soil vacuum extraction – contaminant in the gas phase is extracted via a series of wells and treated above ground.
- Bio-remediation - using non-pathogenic cultures of naturally occurring bacteria combined with nutrient to treat hydrocarbon contaminated soils. Light surface pollution can be treated simply by application to the ground surface as long as it is broken allowing air and water to activate the bacteria. Heavier pollution will require injection of bacteria along with water and/or air.
Validation and Monitoring
Any remediation works should be continuously monitored and checked to ensure they are completed in accordance with the approved strategy. Darcy's team of geo-environmental specialists and chemists can provide site supervision and reporting on the remediation works including all records, drawings, plans and confirmatory analysis.
For further information on our Spill Clean Up and Remediation services or to arrange to speak with one of our geo-environmental specialists to discuss your individual requirements please contact us on 0800 0370 899.
Please note this service is currently available throughout the UK only.