The manual--on wet nonregenerable lime/limestone flue gas desulfurization (FGD) systems--is intended to guide Federal and State regulatory personnel concerned with the inspection and permitting of FGD systems for coal-fired steam electric generators in the U.S. It is a working document for someone who periodically inspects power plants to ensure their compliance with emission standards. Orientation material on the design, operating, and performance characteristics of FGD systems may also be helpful to the environmental regulatory agency permitter. With its goal of facilitating the systematic inspection of an FGD system to determine the system's present and probable future compliance status, the manual limits process theory to a necessary minimum and makes ample use of charts, checklists, and simplified diagrams in providing important guidelines and recommendations. Following the introductory section defining its purpose, approach, and scope, the manual contains sections on lime/limestone technology, performance monitoring, inspection methods and procedures, performance evaluation and problem diagnosis/correction, operation and maintenance, and safety. Appendices provide supplementary reference material, definitions of FGD terms, calculation sheets, and example checklists, the latter two for use by someone inspecting a plant.