Menard was engaged as specialist Ground Improvement contractor by MMG Limited to complete the GI works associated with the construction of the Stage 2 raise to the 2/5 Dam Tailings Storage facility (TSF) at the MMG Rosebery Mine, Tasmania, which comprises of a 3 m raise of the perimeter embankments to RL 173.0 m, Modification to the screening bund and construction of a new southern embankment.

The works included two scopes, an 80m long Cement Bentonite Cut-off wall to provide a continuous homogeneous low permeability barrier to groundwater seepage. The second scope, being the main works on the package, consisted of the installation of a mass Jet Grout block at the western embankment screening bund with the purpose of the grouting to improve the strength of the foundation soils, including old tailings downstream of the screening bund. The treatment length was 275m long, 3m wide, with an average of 4m depth of treatment required. The treatment required a minimum of 1MPa of UCS strength in addition to a reduction of the permeability to 5 Lugeon.