Cornforth Consultants
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U.S. Navy CVN Drydock Dewatering

Bremerton, Washington
The Navy’s CVN Drydock No. 6 had been experiencing settlement for over 40 years. Cracks in the floor slab raised concerns over its structural integrity. Geotechnical investigations indicated loose fill materials and a damaged relief drain system underlying the slab. Compaction grouting was conducted to increase the density of underlying materials at select locations. Additional relief wells were constructed to aid the original relief drain system surrounding the ground improvement modifications. Temporary dewatering wells were also installed to facilitate compaction grouting and relief well construction.

​Cornforth Consultants Inc. (CCI) was retained by Jensen Drilling Company; who as a subcontractor to NOVA Group Inc., was charged with the construction of 10 temporary dewatering wells and 18 permanent relief wells. CCI work tasks and responsibilities included: field supervision and inspection, observation and documentation with quality control reports for drilling, temporary dewatering well and permanent relief well installations, well developments, pump and discharge piping, and well capacity tests. Dewatering wells successfully lowered the artesian pressures under the dry dock and allowed the structure repairs to proceed in the dry.


Type 2 RHRS Slope on Highway 26
CVN Drydock Following Repairs

​Services Provided:

  • Water well drilling inspection
  • Submittal of construction quality reports:
  • - Temporary dewatering wells
  • - Permanent pressure relief wells
  • - Well development, and pumping and well capacity
  • 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