This presentation introduces the viewer to borehole geophysical tools commonly used in hydrogeologic investigations. These tools include gamma, temperature, conductivity, caliper, borehole video, acoustic and optical televiewers, heat-pulse flowmeter, and borehole deviation. Examples and case studies follow illustrating the usefulness of data obtained through the utilization of these tools, especially when used to design packer tests and multi-level discrete-zone sampling strings. In addition, borehole tools commonly used in shallow oil/gas well abandonment are presented. This is part of a geophysics webinar series:Environmental Geophysics Applied to Site Characterization, Plume Mapping, and Remediation MonitoringBorehole Geophysics Applied to Bedrock Hydrogeologic EvaluationsGeophysical Method Selection: Matching Study Goals, Method Capabilities and Limitations, and Site ConditionsThis webinar is a result of Recommendation 9 of EPA?s Superfund Task Force, which encourages the Superfund program to ?utilize state-of-the-art technologies to expedite cleanup.? Actions under this recommendation include expanding the use of new site characterization and remediation technologies and approaches to address contaminated sites. https://www.epa.gov/superfund/superfund-task-force-public-participation-opportunities#webinar To view this archive online or download the slides associated with this seminar, please visit http://www.clu-in.org/conf/tio/BoreholeGeophysics_101818/