Formerly Mulgoa Quarries
The project involved the capping and closure of a landfill covering approximately 200 hectares to a depth of around 1.5 metres, requiring approximately 300,000 m³ of capping material. Works included the supply and installation of geosynthetic materials, two pedestrian bridges, and over 100 culverts and headwalls, along with the importation of additional capping materials to complete the closure and ensure long-term site stability.
Stage 1 involved the capping of 210,000 m², incorporating 600 mm of clay, 500 mm of subsoil, 150 mm of revegetation layer, and 100 mm of topsoil, followed by hydro spray grassing. The works included the establishment of drains across the cap in collaboration with a gas infrastructure contractor, as well as the screening of 17,000 m² of material to complete the capping and site preparation.
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Stage 3 involved the capping of 137,000 m², including 600 mm of clay, 500 mm of subsoil, 150 mm of revegetation layer, and 100 mm of topsoil. Approximately 90,000 tonnes of compliant clay capping material were supplied via MQ trucks and dogs. The works included the construction of drains across the capping in collaboration with a gas infrastructure contractor, as well as the screening of 20,500 m² of material to complete the stage.
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Stage 3 involved the capping of 115,000 m², incorporating 600 mm of clay, 500 mm of subsoil, 150 mm revegetation layer, and 100 mm of topsoil, followed by spray grassing. Approximately 130,000 tonnes of clay and 130,000 tonnes of shale were supplied via MQ truck, along with 10,000 tonnes of topsoil. The works included the construction of drains in collaboration with a gas infrastructure contractor and the screening of 17,000 m² of shale to complete the capping and site preparation.
