1Environmental Engineering Department, Faculty of Civil Engineering and Planning, Institute of Technology ( ITS ), Campus Sukolilo ITS Surabaya, Jl. Arief Rahman Hakim, Surabaya, Indonesia
2Statistics, Faculty of Mathematics and Natural Sciences, The Institute of Technology (ITS), Campus Sukolilo ITS Surabaya, Jl. Arief Rahman Hakim, Surabaya, Indonesia
3Industrial Engineering, Faculty of Industrial Technology, The Institute of Technology (ITS), Campus Sukolilo ITS Surabaya, Jl. Arief Rahman Hakim, Surabaya, Indonesia