1. Dept. of Civil Engineering, Southern Illinois Univ. Edwardsville, Edwardsville, IL 62026-1800 (corresponding author).
2. Dept. of Civil Engineering, Southern Illinois Univ. Edwardsville, Edwardsville, IL 62026-1800.
3. Dept. of Biological Science, Southern Illinois Univ. Edwardsville, Edwardsville, IL 62026-1800.