In 2022, the Group generated a total of 5.2 million tonnes of waste, of which more than 94% was diverted - mainly for reuse - and ~5.9% (versus 2.8% in FY21) was disposed of in a landfill.
The major contributor to growth in waste over recent years has been the amount of spoil, or waste earth and rock, that needed to be disposed of due to an increase in tunnelling activity for major road and rail projects. This spoil has largely been diverted to, or reused on, other commercial and residential developments where it can be reused as fill material.
The Group has a target to recycle or reuse more than 75% of its waste and has exceeded this performance target over the past three years. Ideally, we seek to minimise the disposal of any waste to landfill or other destinations, however this outcome is driven by the type of waste generated on the projects that are undertaken.
Some tunnelling projects generate contaminated or hazardous waste because of the nature of pre-existing soil conditions and the treatment of these materials is prescribed by the relevant Government agencies.