Introductory technical guidance for civil engineers, geotechnical engineers and environmental engineers interested in soil drainage investigations. Here is what is discussed: 1. SCOPE OF THE INVESTIGATIONS, 2. FACTORS IN AN INVESTIGATION, 3. REVIEW OF EXISTING DATA, 4. FIELD RECONNAISSANCE, 5. SUBSURFACE INVESTIGATIONS, 6. IDENTIFYING THE BARRIER ZONE, 7. GEOLOGIC LNFLUENCE, 8. WATER SOURCE STUDIES,...