This handbook describes a broad spectrum of methods in the fields of remote sensing, geophysics, geology, hydrogeology, geochemistry, and microbiology designed to investigate landfill, mining and industrial sites. The descriptions provide information about the principle of the methods, applications, fundamentals, instruments, survey practice, processing and interpretation of the data, quality assurance, personnel, equipment, time needed, examples, as well as references and sources for further reading. Furthermore, this handbook deals with the stepwise procedure for investigating sites and common problems faced in efficient implementation of field operations. It can be used as a practical guide for training students, as well as to illustrate the advantages of interdisciplinary site investigations to decision-makers faced with their own environmental investigations.