Exploration no. 117831 is a Geotechnical (depth 3 feet) named: TH-31 described in subsurface document no. 48069. The document, a report titled Soil and Surfacing Report, SR-5 Blaine Vicinity Ramps Reconstruction, Overlay and Safety MP 273.05 to 276.2 was prepared by WA State Dept. of Transportation on 02-25-1999 for a Roadway project.