Exploration no. 87464 is a Geotechnical (depth 45.5 feet) named: H-1 described in subsurface document no. 16040. The document, a report titled SR-520, HOV Lane Widening, 104th Ave NE to W Lake Sammamish Pkwy, Phase I Structures was prepared by Shannon and Wilson, Inc. on 01-31-1995 for a Roadway project.