Beenyup Advanced Water Recycling Plant

The groundwater replenishment scheme will provide the tertiary treatment of wastewater to drinking water standards and then inject it into aquifers below Perth to replenish groundwater supplies. 
The process and pump buildings consist of structural steel frames with metal wall and roof cladding. The switchroom buildings have precast concrete tilt panel walls with steel rafters and metal roof cladding.
Plexus provided architectural, structural engineering and construction support services for all of the building superstructures.

Mundaring Weir Outlet Upgrade Stage 2

Water Corporation invited McConnell Dowell to participate in an early contractor involvement phase to develop the tender stage design for the execution of the upgrade to the 100-year-old weir outlet, which included the following

• Installation of a 30m tall stainless-steel liner in the intake tower.
• Reline the outlet pipes through the wall & Install new downstream pipework.
• Cutting new access into the weir wall to access the lower drainage gallery.

Plexus provided structural and temporary works design for the project.
 

Newman Water Treatment Plant & NWTP ACF Filters

Plexus have been instrumental in various stages of design, construction and regular upgrade projects for the Newman Water treatment plant for the town of Newman in Western Australia’s Pilbara region. The new Water Treatment Plant will treat an average of 16,500 m3 of bore water per day and supply drinking water to BHP and the town population of 5,500. Currently Plexus is involved with BHP as the clients representatives on Fluoride dosing plant, upgrades to Activated Carbon Filter vessels, tank upgrades, construction of new tanks and operational reliability upgrade projects.

WW - JBL Pipeline Project

BHP is installing a new buried 16.22km DN160 HDPE potable water pipeline between Warrawandu Village Water Treatment Plant (WTP) transfer pumps and Jimblebar Hub.

Plexus Consulting is providing full-time independent quality engineering services on behalf of BHPIO.

The scope of services provided are:

• Review of Contractor’s documentation & MDR.
• Technical Query (TQ) support.
• Continuous site engineering and QA/QC services during the construction stage
• Actively led the pre-commissioning stages of the project as client-side representatives

XD57 Tank Remedial Works

XD57 is a 20ML precast, post-tensioned concrete tank with a connecting chlorine dosing system that stores surplus process water extracted from several pit dewatering bores at Mt Whaleback. Following liner remediation during 2013, annual inspections performed to date the liner, however, was failing and needed replacement. Plexus Consulting provided QA/QC services against project specification requirements and ITPs.

Vasse Diversion Drain Upgrade

Major flooding events in 1997 and 1999 resulted in the upgrade of the existing diversion drain and ancillary structures to ensure that it provides at least 1-in-100 annual exceedance probability flood for all conceivable modes, including the construction of flood compensating basins in the Vasse and Sabina catchments.
Plexus provided engineering design and construction support services for the works, which included the design of an extension to an existing footbridge and temporary works including lifting studies, cofferdam and dewatering pump design and concrete early strength assessments.

Northam Bridge No. 638 Refurbishment Temporary Works

The existing 153m long timber bridge built over the Avon River in the 1940s and was repaired and upgraded by SRG limited. The bridge substructure consisted of timber piles that support timber half-caps, corbels, stringers, timber decking with a concrete overlay and asphalt running surface.
Plexus was responsible for the design of bespoke temporary steel jacking frames to lift complete sections of the bridge deck, enabling half-cap replacement before subsequent demolition and reconstruction of the bridge deck.

Margaret River Perimeter Road Bridge No. 1745 Temporary Works

The 7km long Margaret River Perimeter Road project extends from Airport Access Road north of Margaret River, linking back to Bussell Highway south of Margaret River.
The project included a 96-metre road bridge and a separate footbridge. Plexus provided temporary works design and construction support, which included the structural assessment of the new abutment to support the weight of a 650T crane installing steel girders weighing up to 77T each.

Meltham & Ashfield Train Station Carparks

A portion of the existing train station car parking at Bayswater Station will become unavailable during and after the proposed station upgrade works. 
To maintain network parking capacity, the Public Transport Authority (PTA) aims to increase the car parking area at Meltham Station and construct a new car park at Ashfield Station.
The works include the construction of new at grade, off-street parking areas located in the nature strip between the rail line and the public roads running adjacent to the rail line.
Plexus provided Civil & Electrical engineering design and construction support services for the works.

Western Power Substation Roof Replacements

Due to the age and structural condition of the existing roofs, Western Power commissioned the design and construction of new roof structures and coverings inclusive of all trusses, roofing material, etc at the following sub/relay stations.
Picton, Southern Terminal, Muja Terminal and East Perth Terminal relay rooms.
Plexus was responsible for the design of replacement roof structure and all temporary supports and decking to protect internal live electrical equipment..

City of Joondalup High Light Pole Inspections

Due to concerns regarding the extent of corrosion inside main poles of 500+ ornamental high light poles (10m -12m high), the City of Joondalup commissioned the inspection of the internal surfaces of these poles and rating of the condition following an agreed condition matrix in 1m sections of the pole. 
Plexus was appointed as the principal consultant for the condition assessment and reporting on the light poles.