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Hirata & Associates, Inc.

Practical geotechnical engineering solutions for Hawaii and Guam

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About the firm

Hirata & Associates, Inc. (HAI) is a geotechnical engineering practice based in Aiea, Hawaii, providing services throughout the State of Hawaii and Guam. Established in 1971 as Ernest K. Hirata & Associates, Inc., it has completed more than 6,500 projects for federal, state, municipal, and commercial organizations. HAI specializes in geotechnical investigations, drilling, and construction materials engineering and testing, with notable project experience at airports, schools, bridges, and technology facilities.

Established
1971
Firm type
Geotechnical Engineering · Materials Testing

Credentials

OSHA Safety Training

People

Dustin L. ShimamotoPresident

Rick I.K. YoshidaVice President - Engineering Services Department Head

Andrew K. WeatherholtzVice President - Construction Services Department Head

Capabilities

Geotechnical Engineering

Service website

Comprehensive subsurface investigations, foundation analyses, and design recommendations for complex structural and earthwork projects.

  • Shallow and Deep Foundation Investigations
  • Pavement Design
  • Due Diligence Studies
  • Settlement Analyses
  • Percolation Testing
  • Slab and Exterior Walkway Design
  • Retaining Wall, Soil Anchor, and Soil Nail Wall Design
  • Groundwater and Settlement Monitoring Programs

Construction Materials Engineering and Testing (CoMET)

Service website

Quality control and field verification services to ensure structural materials meet project specifications and regulatory standards.

Drilling

Service website

Subsurface exploratory boring operations capable of extending to significant depths across diverse terrains and accessible sites.

  • Restricted Access Drilling (RAD)

    Utilizing specialized track-mounted drill rigs to perform site investigations in confined or difficult-to-access locations.

  • Deep Boring Operations

    Capable of extending exploratory borings to depths in excess of 200 feet for deep foundation analysis.

  • Multi-Island Rig Mobilization

    Deploying truck-mounted drill rigs based across the major Hawaiian islands to optimize response times and reduce logistics costs.

Laboratory Testing

Service website

Work in this area is organized into supported delivery tasks.

  • Physical

    Support includes Physical.

  • Mechanical Testing Of Soil

    Support includes mechanical testing of soil.

  • Concrete Specimens To Support Engineering Calculations

    Support includes concrete specimens to support engineering calculations.

  • Designs

    Support includes designs.

Industries

Infrastructure · Transportation · Airports · Bridges · Government · Federal · Commercial · Education · Data Centers

Projects

Kahului Airport CONRAC Facility

Kahului Airport · Airports

Project details

Foundation investigation and construction observation for roadway improvements and the Consolidated Rent-A-Car (CONRAC) Facility at Kahului Airport. The scope of work included exploratory borings, laboratory testing, and engineering analysis.

Wallace R. Farrington High School Track Improvements

Education

Project details

Soil investigation and construction observation for all-weather track and miscellaneous improvements, including drilled pier foundation recommendations for stadium light poles.

Hanapepe River Bridge

Bridges

Project details

Foundation investigation for the Hanapepe Bridge Replacement, executed in cooperation with the Central Federal Lands Highway Division (CFLHD) of the Federal Highway Administration (FHWA) and Hawaii Department of Transportation (HDOT).