Horizontal well technology was originally developed for use in petroleum production and underground utility installation, but recently has been adapted for environmental remediation applications. In the environmental remediation industry, horizontal wells provide unique characteristics and advantages that can improve the effectiveness of established soil and groundwater clean-up technologies now using traditional vertical well techniques. To date, over 300 horizontal wells are estimated to have been installed for environmental remediation purposes. This book was difficult because of the interdisciplinary nature of horizontal well technology. The book is mainly directed to the practicing professionals who make engineering calculations and decisions on horizontal well applications. This book can also be used as a graduate level textbook. For managers, the book helps to review the present state of the art.