1. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg VA, USA E-mail: kabill@vt.edu
2. Department of Civil and Environmental Engineering, Virginia Military Institute, Lexington VA, USA E-mail: bottcb@vmi.edu
3. Blue Plains AWWTP, District of Columbia Water and Sewer Authority, Washington DC, USA E-mail: Sudhir.Murthy@dcwasa.com