This scope of work included, the supply of materials, labour, equipment, consumables, services and transport for the fabrication, construction , installation, testing and preparation of necessary documentation for the CCl First Flush Retention Basin permanent civil and concrete works at the Yarwun site for Orica Australia Pty Ltd.

Works involved the demolition and removal of existing CCl outlet and associated pipework, removal of pump, lighting and monitoring station at existing, demolition and removal of lining to temporary drainage, channels and basin floor, demolition and removal of temporary basin pump slab.

Removal of temporary basin dewatering facilities, piling design, supply, installation, testing and certifica­tion of steel screw piles for CCl Basin concrete structure support, earthworks removal and stockpiling of rock lining to temporary drainage channels and basin floor, preparation of basin floor for screw pile installation, backfilling of temporary drainage channels and basin ramp, excavation and backfilling for basin inlet drains, excavation for basin overflow channel, supply and installation of erosion protection mattress to overflow channel, regrading and reinstatement of rock lining within the existing outlet drain, final landscaping earth­ works.