John Sadler, L.E.G., L.H.G., R.G.
Senior Engineering Geologist/Hydrogeologist
John Sadler, L.E.G. L.H.G., R.G. is a licensed engineering geologist and hydrogeologist in the State of Washington and a registered geologist in Oregon with a Bachelor of Science Degree in Geophysics from Western Washington University. For over 36 years, he has managed and/or contributed his technical expertise in geotechnical engineering, engineering geology, environmental consulting, construction monitoring, and laboratory testing, to hundreds of projects located throughout Washington, Oregon, Idaho, Hawaii, eastern Montana, and northern California. His areas of expertise include soil classification and geologic interpretation, geologic hazards, slope stability and stabilization, development feasibility, foundation design, building drainage, airport pavement design, municipal roadways, erosion control, retaining structures, underground utilities, surface and subsurface drainage, dewatering, temporary shoring, structural fills, mass grading, and construction stormwater quality.