Proceedings of the workshop on groundwater contamination study at landfill sites in Selangor, May 13, 2009, Mini Auditorium, NAHRIM / by Workshop on Groundwater Contamination Study at Landfill Sites in Selangor (2009 : Seri Kembangan, Selangor), Ahmad Jamalluddin Shaaban, editor, Saim Suratman, editor, Anuar Sefie, editor, Institut Penyelidikan Hidraulik Kebangsaan Malaysia