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The subject site is located in Asse, Belgium and was used for fabrication and storage of glues and tar containing asphalt products. Due to a fire, a distillation unit of 30 tonnes and a filled storage tank of app. 40 m³ taroil were destroyed.
The Public Waste Agency of Flanders (OVAM) is responsible for the clean-up of the site. An excavation of the superficial DNAPL contamination has already been executed. However, the DNAPL of tar products on the clay-layer at a depth of 14 to 15 m bls still needs corrective action.
Commissioned by OVAM, a pilot for in-situ chemical oxidation (ISCO) with Fenton’s Reagens has been executed on the site. A reasonable reduction of the contaminant load (app. 90%) was obtained.
In order to make a well-founded BATNEEC-evaluation, the DNAPL is further characterized in detail, as the exact volume/proportion and contaminant load will determine the final remediation costs. This characterisation is obtained by using the Rapid Optical Screening Tool (ROST™) of Fugro. ROST™ detects aromatic hydrocarbons by means of a Laser Induced Fluorescence (LIF) technique.