Reducing uncertainity during remedial design — a case study

Thiess was engaged to remediate a former service station site in Perth, Western Australia. Contamination at the site originated from the former underground petroleum storage system (UPSS), and was present in the unsaturated and saturated zones. The geology primarily comprised interbedded sandy-, silty-clay with a range of permeabilities. The groundwater table was located at approximately 6 metres below ground level. Excavation and disposal of soil to landfill was the selected remediation strategy for unsaturated zone soil. Solvent enhanced insitu chemical oxidation (SE-ISCO) was the selected remediation strategy for saturated zone soil and groundwater. (author)