Winner of the Sustainability Award, Celtic shared the podium with runner up the Olympic Delivery Authority at the Brownfield Briefing ceremony. Historic gas holder bases at the site contained significant volumes of coal tars and liquors presenting a risk to the underlying regional aquifer. The sustainability of the project was maximised through a wide range of approaches, beginning with the design process. Works were carried out with the gas holders still covered to minimise impact to neighbours. Tars were recovered and re-use as a secondary fuel. Tanks were backfilled with site won materials so avoiding off-site disposals and road transport.