1. Marmara University, Faculty of Engineering, Department of Environmental Engineering, Goztepe34722, Istanbul, Turkey Phone/Fax: (+90) 216-3481369 Email: akgiray@eng.marmara.edu.tr
2. Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, Maslak 34469, Istanbul, Turkey Email: esoyer@ins.itu.edu.tr