Remove and Replace Roof Structures, Opal Street WTP Filters

Summary and scope

Central Highlands Regional Council operates the Opal Street Water Treatment Plant (WTP) located in Emerald, Queensland. The WTP incorporates four rapid gravity sand filters which form a critical component of the potable water treatment process. Each filter is currently protected by an individual structural steel roof structure. Over time, these roof structures have deteriorated and are approaching the end of their serviceable life. In addition to their deteriorated condition, the existing roof structures do not adequately facilitate the operational requirements associated with periodic filter media replacement. During future filter media replacement campaigns, one-tonne bulk sandbags are required to be lowered into the filter compartments via crane. The existing roof structures do not provide suitable openings through which these bags can be safely lowered into the filters. This creates operational difficulties and increases risk during maintenance activities. Central Highlands Regional Council is seeking responses from suitably qualified and experienced contractors to undertake the design, removal, disposal, supply and construction of replacement roof structures over the four rapid gravity filters. The replacement roof structures must incorporate suitable access openings that facilitate the future lowering of one-tonne bulk bags of filter media into each filter compartment by others under a separate contract. The Works are to be delivered under a Design and Construct Contract.