1. Environmental Laboratory (CEERD-EP-W), U.S. Army Engineer, Research and Development Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180-6199 (corresponding author).
2. Civil and Environmental Engineering, Cornell Univ., Environmental Laboratory, U.S. Army Engineer Research and Development Center, CENWP-EC-HD, 333 SW 1st Ave., P.O. Box 2946, Portland, OR 97208. E-mail.
3. Civil and Environmental Engineering, Cornell Univ., 311 Hollister Hall, Ithaca, NY 14853–3501.