The U.S Coast Guard, in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act and the Resource Conservation and Recovery Act, is conducting environmental studies at its Support Center in Kodiak, Alaska, to determine if hazardous materials have been spilled or disposed of at the facility. The U.S. Geological Survey conducted a hydrologic evaluation of the Support Center to assess the extent of possible ground-water, surface-water, and soil contamination resulting from the handling of hazardous materials. This report describes the borehole and monitoring-well drilling program conducted on the Support Center by the U.S. Geological Survey. It contains maps and diagrams depicting well locations, logs, and construction details, as well as soil-sampling information for 121 boreholes, of which 102 were completed as water-quality monitoring wells.