Mobil Woolston T11 Refounding
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Client: Mobil
Sector: Foundations
Location: Christchurch
Completed: Sep 2013
Main Contractor: Brian Perry Civil

This tank, the largest on site (4.5 million litres), suffered minor damage and liquefaction after the Canterbury earthquakes. Although much of the damage wasn’t immediately visible, the client soon realised that the tank was operating at less than 50 percent of its capacity.

A surveyor discovered that the tank needed extensive refounding work, so in early February, after ACME Engineering removed the tank, a small team started on site with excavation of the tank mound and bunds. Their main role in the project is the installation of 200 stone columns – some of which are founded at up to eight metres deep.

The client decided that BPC was the best choice for the $1.15 million job because of a proven track record and excellent approach to health and safety. The project operates on a live tank farm, which means no mobile phones or key fobs are allowed on site, which has been a real challenge for Chris and the team, who have to conduct all necessary communications from the branch.

Because there was no team in Christchurch, the first thing to do was establish a new branch. Setting up in Fletcher Construction’s Purchas Street offices, the team set about forming relationships with subcontractors and suppliers, all while getting to know each other.

Work Complete – September 2013

 All works were completed in September 2013 after the HDPE Liner was laid, tested and backfilled over. The compound bund wall was reinstated and sprayed with shotcrete to protect the bund from weathering.