The London bid to host the 2012 Games set out a vision and plan for how the Games could play a major role in the revitalisation of east London. Equally important was achieving this in a sustainable manner, providing value for money, and leaving a lasting social, economic and environmental legacy for east London. From the outset, the Olympic Delivery Authority set challenging sustainability targets for the procurement of materials for the Olympic Park. The ODA aimed to identify, source, and use environmentally and socially responsible materials. Initial estimates made for the Park indicated that 500,000 cubic metres of ready-mix concrete would be required to build both the sporting venues and for supporting infrastructure. Through sustainable design initiatives and rationalization of materials the actual volume poured was closer to 400,000 cubic metres with a further 20,000 cubic metres precast off-site. Overall, the Park claimed to have reduced the embodied carbon associated with the Park concrete by approximately 24 per cent (equivalent to 29,000 tonnes) compared to industry average concrete with 18 per cent ground granulated blast furnace slag (GGBS) cement substitution.