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CASE STUDY: IN-SITU REMEDIATION

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CASE STUDY: IN-SITU REMEDIATION
Client: Wright Construction
Value: £750,000
Activities: In-situ remediation of TPH in groundwater, PRB, ORC
Summary
Working in conjunction with the client’s consultant, WA Fairhurst and Partners, VertaseFLI designed a remediation programme for residual groundwater contamination consisting of TPH. The scheme involved the injection of Oxygen Release Compound downstream of contamination along the site boundary adjacent to the River Fosse.

The site is a former metal stocking yard, which was to be redeveloped for prestigious city centre apartments. As the site is very sensitive due to the River Fosse bounding the site and medieval piles present beneath, a full in situ remediation strategy was not feasible. Therefore, in consultation with the Environment Agency and Consultant, VertaseFLI designed the remedial works to have as little impact as possible on both the ground and surface water, and underlying archaeology.
 
In-situ Remediation
ORC (Oxygen Release Compound) is a non toxic substance, which slowly releases oxygen over time, enabling the indigenous microbial population to develop and degrade the residual hydrocarbon contamination. This occurs as the contaminants flow throughout the “virtual” barrier, which in effect remains as permeable as the strata itself enabling contamination to biodegrade as it leaves site in the groundwater.

A small tracked drilling rig was mobilised to site and used to drill 60mm diameter boreholes using a hollow cone bit to approximately 5.00 mbgl. The ORC slurry was then injected using a Geoprope into the formation whilst the drill string was retracted, with one bucket of ORC (13.6kg) pumped into the groundwater under pressure as a slurry between 3 and 5m bgl.

The remediation scheme was very successful leading to full sign off from the Environment Agency, and did not require a secondary treatment of ORC as was anticipated
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