Provision of Design and Construction Services for Replacement of 31 Crib Retaining Walls to the Public Transport Authority

About

Public Transport Authority awarded a contract to Pennant Construction Pty Ltd (The Trustee for the Pennant Unit Trust) for the design and construction of replacement retaining walls for 31 existing crib retaining walls that had deteriorated and were at risk of collapsing.

The works addressed walls that supported trackside embankments carrying signalling and communications assets and were located on the Fremantle, Midland, Yanchep and Armadale train lines.

The contract required detailed and IFC design of 31 new retaining walls based on a reference design, site investigation including pot-holing and pre-works underground survey, dilapidation surveys, and environmental surveys including for potential asbestos, hydrocarbon contamination and Aboriginal Cultural Heritage discovery.

The scope also included removal and reinstatement of boundary fences where applicable, vegetation removal and obtaining environmental approvals, design and provision of required temporary works, relocation and reinstatement of any services as necessary, removal of existing non-compliant handrails and installation of new handrails, installation of two staircases for safe access at F17.190km and F17.468km, completion of works without disruption to normal train services, compliance with Health, Safety, Environmental and Quality requirements, and provision of as-constructed drawings upon completion.

The design and construction were required to comply with relevant PTA requirements and specifications, including Engineering Management for Project (EM4P) requirements and the PTA250079 - AS4902 (Book4) RFT Principals Project Requirements.