0 Citation: Griffin H. and O’Kelly B.C. 2014. Sustainability of combined vacuum and surcharge preloading. In Proceedings of the 2014 Geo-Congress: Geo-Characterization and Modeling for Sustainability, Atlanta, Georgia, USA, 23rd–26th February 2014 (Abu-Farsakh M., Yu X. and Hoyos L.R. (eds.)). American Society of Civil Engineers, Reston, VA, USA. Geotechnical Special Publication (GSP) 234, pp. 3826–3835.