The proponent, Western Power, proposes to dispose of about 6,700 m3/d of clear saline water from the Collie Power Station via a 68 km pipeline to the ocean at the northern end of the Leschenault Peninsula north of Bunbury.
The saline water to be discharged would have a Total Dissolved Solids (TDS) level of 3,200 to 5,000 g/m3, and have ambient temperature. The main constituent would be sodium chloride or common salt. This water, although unsuitable for the power station, could be used by other industries where the concentration of salt or silica is not a limiting factor.
Also included in the wastewater management and disposal proposal are methods for managing liquid industrial and sewage waste waters from the Collie Power Station. Concentrated waste chemicals from boiler cleaning and water treatment, and oily sludges produced from treating rainfall runoff from plant hardstand areas, would be collected by road tankers for disposal at a licensed off-site treatment plant. Treated sewage would be used to irrigate an on-site blue gum plantation.