1. Senior Lecturer, Centre for Offshore Foundation Systems, Univ. of Western Australia, Crawley, Perth, WA 6009, Australia. E-mail: susan@civil.uwa.edu.au
2. Geotechnical Engineer, Coffey Geosciences Pty Ltd., 24 Hasler Rd., Herdsman, Perth WA 6017, Australia; formerly, Student, Univ. of Western Australia. E-mail: Mark-Steinepreis@coffeygeosciences.com.au