Engineering concern Monadelphous Group Ltd. (MND.AU) said Monday it has received construction contracts together worth more than A$180 million from Rio Tinto PLC (RIO) and Chevron Corp. (CVX).

The contracts take the value of new work secured by Monadelphous this financial year to more than A$1.5 billion, Monadelphous said in a statement.

The Perth-based company said it will build a potable water supply system in Western Australia's Pilbara region for Rio Tinto that will deliver 10 gigaliters a year. Work is due to begin this quarter and is set for completion in the first half of next year, it said.

The second contract is for the construction of a CO2 injection pipeline and well sites on the Gorgon Project, on Western Australia's Barrow Island. Monadelphous said the work will include seven kilometers of underground pipeline, five well sites and associated facilities.

Work will begin immediately and is set for completion in the first quarter of 2013, it said.

-By Robb M. Stewart, Dow Jones Newswires; +61 3 9292 2094; robb.stewart@dowjones.com