Cornforth Consultants
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  • Services
    • Earth & Rockfill Dams
    • Reservoirs, Canals, and Levees
    • Spillway Safety Inspections
    • Landslides and Rockfall
    • Earthquake Engineering
    • Geologic Hazards
    • Geotechnical Site Characterization
    • Hydrogeology
    • Expert Witness
    • Concrete Dams and Locks
    • Geotechnical Instrumentation
    • Deep and Shallow Foundations
    • Geotechnical Manuals
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    • Earth and Rockfill Dams >
      • Barney Reservoir
      • Frog Lake Reservoir
      • Iron Gate Dam Raise
      • McGuire Dam Raise
      • Bonneville Cofferdam
      • Bull Run No. 2 Seismic Stability Analysis
    • Levees and Canals >
      • Libby Dike Rehab.
      • St. Johns Dike Stabilization
      • Cowlitz River Levees
      • Swift Canal Failure
    • Earthquake Engineering >
      • Barney Dam Seismic Analysis
      • Fern Hill WTP Liquefacation Study
      • Bull Run No. 2 Seismic Stability Analysis
      • Mt. Tabor Seismic Stability Analysis
      • Port Westward Power Plant Seismic Design
    • Rock Slopes and Tunnels >
      • Libby Rockfall Mitigation
      • Sandy River Pipeline Tunnels
      • Ketchikan Third Avenue Extension
      • Sain Creek Water Supply Tunnel
      • Montana Rockfall Hazard Rating System
    • Foundations >
      • Port Westward Power Plant
      • Cascade Locks Casino
      • Air National Guard Hangar
      • Biglow Canyon Windfarm
      • Oakridge Water System Improvements
    • Concrete Dams and Locks >
      • John Day Lock & Dam
      • Marmot Dam Removal
      • The Dalles Dam
      • Willamette Falls Dam
      • Bonneville Dam
    • Transportation >
      • OTIA Cracked Bridge Geotechnical Baselines
      • Newburg Dundee Bypass Design DEIS
      • I-84 Sandy River Bridge Investigation
      • Tanana River Bridge Foundation, Tok, Alaska
      • Montana RHRS Implementation
      • Ketchikan Third Avenue Extension
    • Ports and Airports >
      • Navy CVN Drydock
      • Depoe Bay Seawall Distress
      • Willamette Falls Flow Control Structure
      • Air National Guard Hangar
    • Water and Wastewater >
      • Fern Hill Water Treatment Plant
      • Tualatin Valley North Transmission Line
      • Evaluation of 28 Water Storage Facilities
      • City of Sandy Water Treatment Plant
      • Mt. Tabor Reservoir No. 5 Cap Study
      • Oakridge Water System Improvements
  • Staff
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    • Geotechnical Engineer
  • Contact Us

Sebastian Dirringer

Wade Osborne, P.E.
Registration
Geologist – Oregon, Washington

Engineering Geologist – Oregon, Washington

Career
2020 - Present - Project Engineering Geologist
Cornforth Consultants

2019-2020 - Staff Geologist,
GeoEngineers

2015 – 2018 – Staff Geologist,
Cornforth Consultants

Education
2015 M.S. Engineering Geology - Kent State University, Kent, OH

2013 B.S. Geology - State University of New York (SUNY), New Paltz, NY

​Honors/Societies
Society of Professional Rope Access Technicians (SPRAT), Level I Rope Access Technician

Member, Oregon Section of Association of Engineering and Environmental Geologists

​Member, Oregon Section of American Society of Civil Engineers

Project Geologist
Mr. Dirringer has 7 years of experience specializing in engineering geology geotechnical engineering in the Pacific Northwest, Alaska and the east coast.
His areas of professional expertise include geologic reconnaissance, complex site explorations for dams and levees, geologic hazard assessments, rock slope and rockfall mitigation, landslide repair work, and construction inspection and QA/QC services. Mr. Dirringer regularly provides engineering support during construction to assure compliance with contract specifications. In addition, his vast experience with drilling and instrument installations has resulted in acceptance of his credentials by the Federal Energy Regulatory Commission (FERC) for drilling projects in hydroelectric dams. Additionally, he is an active member of the CCI rope access team with extensive experience conducting on-slope work related to reconnaissance, investigation, design and construction support for rock slope stability projects.  

Mr. Dirringer has served as an engineering geologist on the following representative projects.
​​
  • Washington Park Reservoir Improvements, Portland, Oregon
  • Multnomah County Drainage District Levee Evaluations, Portland, Oregon
  • Sandy Drainage Improvement Company Levee Evaluations, Portland, Oregon
  • Statewide Rockfall Hazard Rating System (RHRS), Montana
  • Seward Highway Rockfall Mitigation, Anchorage, Alaska
  • Hwy 20 Pioneer Mountain to Eddyville, Eddyville, Oregon
  • Tukwila Levee Rehabilitation and Design, Tukwila, Washington
  • Yale Dam Spillway Inspection, Ariel, Washington
  • Historic Columbia River Highway Trail, Hood River, Oregon
  • Wasco County Landfill Monitoring, The Dalles, Oregon​
  • US Highway 26 Improvements, Mt. Hood, Government Camp, Oregon
  • Icy Point Gondola Tower Foundation Design, Hoonah, Alaska
  • D3 I-15 Rockfall Mitigation, Helena, Montana
  • CWHM Bridge Replacement, Skagway, Alaska
  • US Hwy 20 Pioneer Mountain to Eddyville Realignment, Eddyville, Oregon
  • Sterling Hwy MP 45-60 Realignment, Cooper Landing, Alaska
  • Santiam Pass Hwy 20 Slides, Sweet Home, Oregon

​Mike Meyer - Gerry Heslin - George Machan - ​Charlie Hammond - Brent Black - Darren Beckstrand - Chris Carpenter - Ben George
​
Wade Osborne -  Tom Westover - Greg Landau - Aine Mines - Logan Allender - Andy Kost - Adam Koslofsky - Sebastian Dirringer
Rachel Hunt -Justin McCarley - Aleyna Link - Michael Bunn - Andy Vessely - Larry Pierson - John Sager
  • Home
  • Services
    • Earth & Rockfill Dams
    • Reservoirs, Canals, and Levees
    • Spillway Safety Inspections
    • Landslides and Rockfall
    • Earthquake Engineering
    • Geologic Hazards
    • Geotechnical Site Characterization
    • Hydrogeology
    • Expert Witness
    • Concrete Dams and Locks
    • Geotechnical Instrumentation
    • Deep and Shallow Foundations
    • Geotechnical Manuals
  • Industries
    • Water Resources
    • Energy
    • Natural Resources
    • Industrial
    • Transportation
    • Ports and Airports
    • Expert Witness
  • Projects
    • Earth and Rockfill Dams >
      • Barney Reservoir
      • Frog Lake Reservoir
      • Iron Gate Dam Raise
      • McGuire Dam Raise
      • Bonneville Cofferdam
      • Bull Run No. 2 Seismic Stability Analysis
    • Levees and Canals >
      • Libby Dike Rehab.
      • St. Johns Dike Stabilization
      • Cowlitz River Levees
      • Swift Canal Failure
    • Earthquake Engineering >
      • Barney Dam Seismic Analysis
      • Fern Hill WTP Liquefacation Study
      • Bull Run No. 2 Seismic Stability Analysis
      • Mt. Tabor Seismic Stability Analysis
      • Port Westward Power Plant Seismic Design
    • Rock Slopes and Tunnels >
      • Libby Rockfall Mitigation
      • Sandy River Pipeline Tunnels
      • Ketchikan Third Avenue Extension
      • Sain Creek Water Supply Tunnel
      • Montana Rockfall Hazard Rating System
    • Foundations >
      • Port Westward Power Plant
      • Cascade Locks Casino
      • Air National Guard Hangar
      • Biglow Canyon Windfarm
      • Oakridge Water System Improvements
    • Concrete Dams and Locks >
      • John Day Lock & Dam
      • Marmot Dam Removal
      • The Dalles Dam
      • Willamette Falls Dam
      • Bonneville Dam
    • Transportation >
      • OTIA Cracked Bridge Geotechnical Baselines
      • Newburg Dundee Bypass Design DEIS
      • I-84 Sandy River Bridge Investigation
      • Tanana River Bridge Foundation, Tok, Alaska
      • Montana RHRS Implementation
      • Ketchikan Third Avenue Extension
    • Ports and Airports >
      • Navy CVN Drydock
      • Depoe Bay Seawall Distress
      • Willamette Falls Flow Control Structure
      • Air National Guard Hangar
    • Water and Wastewater >
      • Fern Hill Water Treatment Plant
      • Tualatin Valley North Transmission Line
      • Evaluation of 28 Water Storage Facilities
      • City of Sandy Water Treatment Plant
      • Mt. Tabor Reservoir No. 5 Cap Study
      • Oakridge Water System Improvements
  • Staff
  • Resources
  • Careers
    • Geotechnical Engineer
  • Contact Us