1. Postdoctoral Research Associate, Energy and Infrastructure Analysis (D-4), Los Alamos National Laboratory, P.O. Box 1663, MS K557, Los Alamos, NM 87545 (corresponding author).
2. Director, Dept. of Civil Engineering, Center for Underground Infrastructure Research and Education (CUIRE), Univ. of Texas at Arlington, Box 19308, 428 Nedderman Hall, Arlington, TX 76019-0308.