This book includes: introduction to ground water contamination; ground water hydrology; ground water flow and well mechanics; sources and types of groundwater contamination; hydrogeologic site investigatons; contaminant transport mechanisms; contaminant fate processes; modeling biodegdation and natural attenuation; flow and transport in the unsaturated zone; numerical modeling of contaminant; nonaqueous phase liquids; natural attenuation and risk based corrective action; ground water remediation alternatives; legal protection of ground water.