Field instrumentation for performance assessment of Geobarrier System Harianto Rahardjo, Zhai Qian, Alfrendo Satyanaga, Eng Choon Leong, Chien Looi Wang and Johnny Liang Heng Wong E3S Web Conf., 9 (2016) 15006 Published online: 12 September 2016 DOI: 10.1051/e3sconf/20160915006