Public Transport Authority
Provision of Design and Construction Services for Retaining Wall Replacement - - Background The Public Transport Authority& rsquo; s ( PTA), Network & Infrastructure ( N& I), Civil Branch requires the replacement of 31 crib retaining walls as the walls are progressively deteriorating. The crib retaining walls have deteriorated and are at risk of collapsing. They support trackside embankments which hold signalling and communications assets. The walls are located on the Fremantle, Midland, Yanchep and Armadal
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