Wagstaff Piling was contracted by Orica to construct a cut-off wall to contain mercury-contaminated soil as part of a project to remediate the Former Chlor Alkali Plant (FCAP) area on Orica’s Botany site in Sydney, NSW. The wall was approximately 430m in length, 0.8m thick and was constructed to a depth of around 25m with a Bauer RG25 rig and Bauer BCM5 cutter, passing through the Botany Sands and keying into the underlying clayey soil or sandstone layers. The wall was designed to withstand site groundwater with highly variable quality and to meet initial and long-term water permeability requirements.
