Introductory technical guidance for civil engineers and environmental engineers interested in land treatment of wastewater. Here is what is discussed: 1. INTRODUCTION, 2. PHYSICAL PROPERTIES, 3. HYDRAULIC PROPERTIES, 4. INFILTRATION RATE MEASUREMENTS, 5. MEASUREMENT OF VERTICAL HYDRAULIC CONDUCTIVITY, 6. GROUND WATER, 7. SOIL CHEMICAL PROPERTIES, 8. REFERENCES.