Located approximately 6 km south of Mount Isa, Stanwell’s ageing Mica Creek Power Station required works to its drainage network. Epoca was the successful contractor for this project.

OVERVIEW

This project involved the construction of a 2 mega litre (ML) turkey’s nest with a rock lined spillway and balancing pipe to the existing drainage network at Mica Creek Power Station.

PROJECT SCOPE

• Clearing, grubbing and stripping.
• Earthworks cut from excavation for new embankments, including trimming to final levels, access ramps, spillway and inlet sump;
• Lay and seal HDPE liner, including anchor trench;
• Excavation and installation of DN 800 HDPE balancing pipe;
• Excavate, place and cure concrete base slab to seal balancing pipe to liner, including reinforcement, hydrotite seals and extrusion welding;
• Install Class 3 DN 375 RCP below access ramp at downstream embankment toe;
• Empty effluent line (approx. 3000 L) and dismantle, reconfigure and raise isolation and scour valves on the existing effluent line, including new pipe supports and slabs;
• Install extension pipework to discharge existing scour valves into new pond, including pipework, pipe supports and concrete slab.

KEY CHALLENGES AND ACHIEVEMENTS

• Interaction with multiple land owners » Safe delivery of works during the cane crush season, site is bordered by active cane farms
• Management & procurement of long lead time materials