Fort Irwin Guesthouse, Barstow, CA
Fort Irwin Guesthouse, Barstow, CA


U.S. Army Corps of Engineers (USACE)

Completion Date


DYA Client

Landmark Organization

Project Description

Diaz•Yourman & Associates (DYA) provided geotechnical services for a project consisting of a new three-story, 180-room guesthouse.  The project required obtaining clearance permits, locating underground utilities, performing a field investigation, and laboratory testing.  The initial project site was moved after DYA identified numerous utilities.  DYA provided geotechnical investigation and foundation recommendations to reduce risk of damage due to collapsible soils by controlling water infiltration, recompacting the upper soils, and using a geotextile reinforced, compacted fill pad and continuous foundations.  This project demonstrated DYA’s ability to manage a small, low-budget project at a distant location, while providing innovative, cost-effective solutions to a difficult geotechnical problem.  In addition, DYA provided services during construction, including observation and testing of earthwork and base materials below the pavement.

Gary K. Gilbert, PE, GE – Geotechnical Manager

Gerald M. Diaz, PE, GE – Geotechnical Principal

Somadevan Niranjanan, PE, GE – Geotechnical Project Engineer

Our Services


  • Site and route evaluations
  • Geologic hazards
  • Seismic design
  • Site characterization
  • Subsurface drainage
  • Grading
  • Ground improvement
  • Slope stability
  • Foundations
  • Dynamic analyses
  • Pavements
  • Instrumentation


  • Material sources
  • Construction observation and testing
  • Verification of anticipated conditions
  • Evaluation of changed conditions
  • Foundation installation
  • Instrumentation
  • Claims evaluation


  • Site characterization
  • Remediation
  • Solid and liquid waste disposal
  • Landfill
  • Aerially Deposited Lead (ADL) Studies
  • Phase I Initial Site Assessments (ISA)
  • Phase II Hazardous Waste Studies
  • Sustainability


  • Forensic investigation
  • Litigation support

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