Exploration no. 51258 is a Geotechnical (depth 51.5 feet) named: L-1 described in subsurface document no. 9392. The document, a report titled I-5 HOV / Truck Climbing Lane, Orillia Rd to Tukwila was prepared by Landau Associates, Inc. on 02-16-1994 for a Roadway project.