Exploration no. 105161 is a Geotechnical (depth 29 feet) named: DH-18 described in subsurface document no. 36077. The document, a report titled Hoquiam Waterline Crossing, Sewerline Crossing, and UV Disinfection Improvements Project was prepared by Neil H. Twelker and Associates, Inc. on 11-01-2004 for a Utility project.