3.1 Introduction 3.2 Lightweight and Structural Fills 3.3 Compaction 3.4 Soil-cement, Lime, and Fly Ash 3.5 Precompression to improve site soils 3.6 drainage using sand blankets and drains 3.7 Sand Columns to Increase Soil Stiffness 3.8 Stone Columns 3.9 Soil-cement Piles/columns