This book is meant for a wide range of readers, especially college and university students wishing to learn Environmental Impact Assessment as well as Risk Analysis in underground gas pipeline. The preparation of this was assisted greatly by the constructive criticisms of colleagues and users of the text. The work concentrates on the type of impact and the concentration of environmental pollutant at particular project site. Authors believe that book will be a very good compendium for almost all readers and other professionals, who wish to enrich their knowledge on EIA and RA in the best manner.