These proceedings of the April 2006 conference include over 215 papers documenting theoretical and methodological advances in working with natural soils (expansive and non-expansive), chemically stabilized soil, geosynthetics, geocomposite soils, and bentonite products. General topics include field studies of water movement in unsaturated soil, in situ testing, field studies involving pavements and those of soil-atmospheric interactions and evapotanspiration, geotechnical practice, challenges in transportation infrastructure projects, analysis of slope stability, dynamic behavior and liquefaction, geophysical methods, evapotranspirative cover systems, laboratory investigations of soil systems and equipment (including volume change, expansive soil behavior, collapsible soils, shrinkage, shear strength, soil-water retention characteristics, water and gas flow, particular soils, temperature effects, test methods, tensiometer testing and development) and modeling (including constitutive modeling for unsaturated geomaterials, slabs and pavements on expansive soils, microscale behavior, soil-atmosphere interaction and evapotranspiration, slopes and embankments, stress states, water retention, and waste repositories). The editors include a helpful subject index. Annotation ©2006 Book News, Inc., Portland, OR (booknews.com)