Sheetpiles installed at the Caltex Service Station Roseberry in Sydney for the installation of new fuel tanks were leaking near the base. With a high water table, even with dewatering, the groundwater was carrying sand into the excavation. GFWAust were asked to seal the leaks and injected over 3,500 litres of microfine grout behind the sheets at the joints to seal of the inflow of sand and water.