WBHO has a permanent site team of 30+ workforce undertaking numerous major capital works and maintenance projects at Alcoa Refinery and Residue Area in WA.
The scope of work comprises civil construction, earthworks, services, constructability and design review input. Alcoa Pinjarra is one of the world’s largest refineries, with an alumina output capacity of 4.2 million tonnes per year and over 1,000 staff.
WBHO’s projects across Alcoa sites have been numerous and varied, and have included delivery of new and upgraded access roads, hardstands, site-wide infrastructure and a new $70m 90ha Clay-HDPE Bauxite Residue Storage Area. Works are split over three sites: Kwinana refinery, Kwinana residue and Pinjarra Refinery & Residue area, with numerous teams working across these sites at any given time.
Construction of the $70m Residue Storage Area consisted of 1,000,000m2 of a Three Layered lining System (HDPE Liner – GCL – HDPE Liner) being placed in challenging climatic conditions, extreme temperatures and tight timeframes. During the works, the client made significant changes late in the construction period, principally the decision to utilise geosynthetic lining in lieu of clay liner. This change required significant reprogramming of works, undertaken in coordination with the client to ensure their operations remain unaffected by the changed schedule.