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EspañolA single application reduces recalcitrant contaminant below target
Summary
The groundwater under a large industrial facility in Kent was contaminated with up to 8,000 μg/L of 1,2-Dichloroethane (DCA). It was determined that remediation should be undertaken to protect off-site controlled waters. Regenesis Remediation Services (RRS) were employed to complete a pump test and tracer test in order to better understand the groundwater flow and vertical delineation of the plume. A pilot-scale application of ORC Advanced® was completed to determine efficacy and radius of influence. Based on the pilot results, a full-scale strategy was implemented.
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Treatment
For the full-scale treatment, the site was sectioned into two target zones. Each zone was split into areas of high, medium and low dosage to match the contaminant distribution. RRS installed further validation wells and cored each, in order to precisely map the target gravel band containing the contamination.
RegenOx® and ORC Advanced® were injected between 5.5 and 9.0 m BGL across an area of 2,400 m2 using 252 injection points on a 3 m grid. The works took 16 days onsite.
What’s Special?
- The 1,2-DCA concentrations quickly reduced to below the target level of 1,250 μg/L and continued to decrease further throughout the 12 months validation period. Regulatory closure of the site was then attained.
- Regenesis provided an accurate, safe and cost effective solution for this large site; from tracer testing, pilot application, successful remediation from a single injection, to decommissioning of the validation wells, at a cost of £420,000.
