Laboratory Testing

GSI is a certified, full-service soil testing laboratory with over 50 years of experience in providing comprehensive soil testing, analysis, and quality assurance services for a wide range of engineering, construction, and environmental projects. Our laboratory is accredited by the:

  • American Association of State Highway and Transportation Officials (AASHTO), the American Concrete

  • Institute (ACI), and participates in both the AASHTO Materials Reference Laboratory (AMRL) and the

  • Cement and Concrete Reference Laboratory (CCRL) proficiency programs.

GSI adheres to the highest standards of quality control, following both American Association of State Highway and Transportation Officials (AASHTO) and American Concrete Institute (ACI) guidelines to ensure that all results are accurate, consistent, and reliable. Our laboratory operates under a documented quality management system (QMS) in accordance with ISO 17025:2017 standards, ensuring that all testing is performed under controlled conditions, and our results are traceable and verifiable.

Our laboratory is equipped with the latest testing equipment and technologies to provide precise and reliable soil analysis. We regularly update our equipment to stay ahead of industry standards and ensure the highest quality of testing.


Core Services:

  • Soil Classification and Testing:
    Our laboratory conducts various soil classification tests in accordance with ASTM, AASHTO, Caltrans, and other industry standards. These include tests for grain size distribution, Atterberg limits, soil compaction, permeability, moisture content, and more.

  • Compaction and Density Testing:
    We perform both field and laboratory compaction tests to ensure that soil compaction meets engineering specifications. Our methods include Standard Proctor and Modified Proctor compaction tests, as well as in-situ testing with nuclear density gauges.

  • Geotechnical Testing:
    Our services extend to geotechnical investigations, including tests to assess soil shear strength, consolidation, and settlement characteristics. We provide support for foundation design, slope stability analysis, and other geotechnical evaluations.

  • Environmental Testing:
    In addition to standard soil testing, we also offer environmental analysis to evaluate soil contamination, hazardous materials, and other environmental concerns as required by regulatory agencies.

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 At GSI, we prioritize our clients' needs by offering fast turnaround times, detailed reports, and comprehensive consultation on test results. Our team of experienced professionals is committed to providing exceptional customer service, helping our clients make informed decisions and meet project requirements efficiently.

For more information or to request a quote, please contact our lab at tratican@geosoils.com or (760) 494-3290. We look forward to serving you.