McCosker Contracting have an ongoing contract with QAL to conduct Mud Farming and Dam Maintenance operations on Residue Disposal Area (RDA) dams #1 and #2.

The operation includes the supply of Amphibious Scrollers, designed and built by McCosker, and modified LGP Bulldozers, operation/training and maintenance of amphibious excavators, Dam wall raisers and repairs for all Maintenance and Operations Works at the RDA, Ash Dams and associated structures.

Key activities include:

• Supply, Operation and Maintenance of Plant and Equipment for de-watering and consolidation of residue material.
• Supply, Supervision and Operation of plant for Civil Work and Maintenance, including:

– Ash Dam facility and residue 

– Upstream wall raises

– Dam maintenance

– Operation and maintenance of dewatering pumps and piping systems

– Road and drain maintenance 

– Miscellaneous drainage and civil works

– Sediment control structures

– Decant Structures

– HDPE Installation and welding

– Dam wall raisers and repairs.

• Management and blasting of onsite borrow pits in accordance with all relevant legislative and safety requirements.
• Operation of borrow pits and production of various materials required for earthworks construction.
• Supply labour and plant to maintain the owners 8,500m residue supply pipeline structures from the Refinery Plant boundary to the RDA Neutralising Plant.
• Relocation and rework of the residue HDPE distribution headers and valving ring mains, as required for dam wall construction and routine maintenance. Including pipeline cutting and welding.