Amila Sandaruwan Ratnayake¹, Premila Wijesinghe², Madumini Senanayake², Dilmi Wijewardhana² and Nalin Ratnayake³, (1)Uva Wellassa University of Sri Lanka, Badulla, Sri Lanka, (2)Uva Wellassa University of Sri Lanka, Department of Science and Technology, Badulla, Sri Lanka, (3)University of Moratuwa, Department of Earth Resources Engineering, Moratuwa, Sri Lanka