Design and construction of the elevated section of the Westgate Freeway, South Melbourne, Australia

Part I of Paper 9637 is, in itself, a textbook approach to how a site investigation should be carried out. To carry out an investigative bore at each of the 420 pile positions is something I have never encountered before, and with this high degree of subsoil information was it possible to lower conventional safety factors? I should also be interested to know whether any cost analysis was carried out to determine the cost-effectiveness of the exercise, and the relationship between the site survey cost and total cost. How does this compare with similar projects in Australia?