Chapter 1Hydrological and Geochemical Processes Controlling the Fate and Transport of Contaminants in Fractured Bedrock / Philip M. Jardine, Tonia L. Mehlhorn, Y. Roh, William E. Sanford -- 1 -- Chapter 2 Mineral Controls in Colloid-Mediated Transport of Metals in Soil Environments / A.D. Karathanasis -- 25 -- Chapter 3 A Web-Based Three-Dimensional Simulation System for Solute Transport in Soil / Honghai Zeng, Vladimir J. Alarcon, William L. Kingery, H. Magdi Selim, Jianping Zhu -- 51 -- Chapter 4 Effect of Structural Charges on Proton Adsorption at Clay Surfaces / Marcelo J. Avena, Carlos P. De Pauli -- 79 -- Chapter 5 Molecular Modeling of Fulvic and Humic Acids: Charging Effects and Interactions with Al[superscript 3+], Benzene, and Pyridine / James D. Kubicki, Chad C. Trout -- 113 -- Chapter 6 Silicon-Organic Interactions in the Environment and in Organisms / Nita Sahai -- 145 -- Chapter 7 Formation of Biogenic Manganese Oxides and Their Influence on the Scavenging of Toxic Trace Elements / Yarrow M. Nelson, Leonard W. Lion -- 169 -- Chapter 8 Zinc Speciation in Contaminated Soils Combining Direct and Indirect Characterization Methods / Darryl Roberts, Andreas Scheinost, Donald L. Sparks -- 187 -- Chapter 9 Reduction/Cation Exchange Model of the Coincident Release of Manganese and Trace Metals following Soil Reduction / Dean M. Heil, Grant E. Cardon, Colleen H. Green -- 229 -- Chapter 10 Behavior of Heavy Metals in Soil: Effect of Dissolved Organic Matter / Lixiang X. Zhou, J.W.C. Wong -- 245 -- Chapter 11 Analytical Techniques for Characterizing Complex Mineral Assemblages: Mobile Soil and Groundwater Colloids / John C. Seaman, M. Guerin, B.P. Jackson, P.M. Bertsch, J.F. Ranville -- 271 -- Chapter 12 Kinetic Modeling of Sulfate Transport in a Forest Soil / H. Magdi Selim, George R. Gobran, Ximing Guan, Nicholas Clarke -- 311 -- Chapter 13 Solubility of Fluoride in Semi-Arid Environments / K.J. Reddy, Michelle M. Patterson, J. Daniel Rodgers, Richard E. Jackson, Barry L. Perryman -- 331.