forensic investigations

Established in 1986, Group Delta's team of highly experienced engineers, geologists, and technicians have been at the forefront of the geotechnical and environmental engineering industry. Our areas of expertise include the investigation of distress and extent of damages related to a variety of causes such as:

  • Water Intrusion
  • Landslide
  • Earthquakes
  • Construction Defects
  • Soil Settlement
  • Expansive Soils
  • Seepage
  • Mudflows
  • Slope Failure
  • Soil Creep
  • Tree Roots
  • Vibrations
  • Surface Drainage
  • Subsurface Drainage
  • Bridge Deficiencies/Deterioration
  • Wood Rot and Fungus
  • Vehicle Impact
  • Wind
  • Explosions and Air Blast
  • Tree Impact
  • Fire

Specific services offered

  • Underpinning, grouting and dewatering analyses
  • Earthquake investigations, i.e., evaluations of liquefaction potential, seismic settlement, seismic slope stability, and site specific ground motions
  • Deep foundation testing and engineering 
  • Design of retaining walls, drainage systems, and slope stabilization methods
  • Soils and materials testing in our in-house certified laboratory
  • Causation reports for Insurance Companies
  • Mediation and expert witness services
  • Third party report and document review
  • Repair recommendations
  • Subsurface investigations
  • Foundation and pavement design
  • Vibration and construction monitoring
  • Shoring of excavations
  • Field instrumentation and testing


Insurance claims, litigation cases and emergency response sometimes require the evaluation for the presence of mold or hazardous materials. Our environmental team can provide assistance in evaluating cases containing mold, asbestos, and lead-based paint.



Our six offices are located throughout California in the counties of Los Angeles, Orange, San Bernardino, San Diego, and Alameda.

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Our team consists of highly trained professionals and are ready to respond our clients requests.

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