5 grams of sediment was crushed and dry-sieved to remove gravel (>2 mm). Depending on grain size of the sediment, 0.2 to 5 grams of sieved sample was transferred into a glass bottle with 0.5 ml 5% HMP solution and 30 ml deionized water. Sample was shaken for 8 hours prior to analysis. The dispersed sample was transferred to a Malvern Mastersizer 3000 laser diffraction particle size analyzer for particle size analysis.