The manual presents a systematic approach to conducting groundwater/subsurface (hydrogeologic) investigations at hazardous waste sites. The procedures include obtaining background information, inspecting and monitoring the site, and installing monitoring wells. Suggested information gathering activities are proposed and major considerations for designing and/or evaluating a monitoring well network are presented. The subject areas and information types are not prioritized because each groundwater pollution problem occurs in a unique hydrogeologic setting. By considering the potential data use in each subject area and the characteristics of the site under study, the investigator determines the types and extent of information required to define a particular pollution problem. Also included are seven appendices that describe sources of hydrogeologic and other relevant data, fundamentals of groundwater hydrology, procedures for well drilling and equipment for borehole air sampling. More than 80 cited and bibliographic references are presented.

"July 1981." "EPA-330/9-81-002."