Who We Are

Providing Geotechnical Solutions Since 2005

What We Do

Yogi Kwong Engineers was established in April 2005 by David R. Yogi, Jr., P.E. and James K.P. Kwong, Ph.D., P.E. We are a geotechnical engineering firm specializing in geotechnical engineering, construction management, and engineering geology.

Our engineers have completed over 400 projects totaling nearly $2.5 billion in construction cost ranging from major structures, state-of-the-art trenchless pipeline projects, to providing construction management services to owners and civil engineering clients.

Soil and Rock Testing Laboratory

Our soil and rock testing laboratory is accredited as a Soils and Aggregate Testing Laboratory by the American Association of State Highway and Transportation Officials and validated by the U.S. Department of Army Corps of Engineers.  Listed below are some of the accredited testing services we provide.

  • Sieve/Gradation
  • Atterberg Limits
  • Organic Content
  • Moisture/Density
  • Expansion/Swell
  • Specific Gravity
  • Unconfined Compressive Strength
  • Triaxial Shear Strength
  • Direct Shear Strength
  • Consolidation
  • Permeability
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YK Drilling

Established in 2009, YK Drilling, LLC (YKD) provides geotechnical, environmental, and water well drilling services throughout the State of Hawaii and the Pacific.  YKD has completed over 200 drilling projects with sampling depths ranging from 5 feet to 720 feet deep in basalt rock.

YKD has performed many geotechnical explorations on State of Hawaii Department of Transportation and City and County of Honolulu right-of-ways, and in difficult access areas.

Drill Rigs

  • 2018 Simco 2800 Drill mounted on a 4×2 International truck
  • 2011 Mobile Drill B-54 mounted on a Ford F650 truck
  • 2016 Versa Drill V-140X mounted on a Peterbilt 348 6×6
  • 2022 Gtech Drill GT8 mounted on tracks
  • 2012 Boart Longyear Surface Core Fly Drill
  • 2013 Explo 220 Portable Drill

Soil and Rock Samplers

  • Split Spoon Sampler
  • Modified California Sampler
  • Dames & Moore Sampler
  • Shelby Tube
  • Piston Sampler
  • N-Size Double Tube Conventional and Wireline Coring Systems
  • Double and Triple Tube H- and P-Size Wireline Coring Systems


  • Drilling
    • Geotechnical Drilling
    • Environmental Drilling
    • Diamond Core in Deep Rock
    • Water Well
  • Coring
    • Pavement and Concrete Coring
    • Drilled Shaft Concrete
  • Testing
    • In-Hole Permeability Testing
      • Single or Double Inflatable Packer Testing
      • Falling Head Test
      • Constant Head Test
      • Slug Test
    • Controlled Aquifer Pump Test
    • Cone Penetration Test
  • Monitoring Equipment Installations
    • Groundwater Monitoring Well Installation and Development
    • Inclinometer Casing
    • Extensometer
    • Tensiometer
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