NOA’s Geotechnical Department offers professional and technical services in all aspects of geotechnical and earthwork engineering. Through utilization of innovative and practical problem solving skills, we are able to develop and design environmentally responsible, logical and affordable engineering solutions to complex geotechnical challenges.

Our highly coordinated and technically experienced team under the direction of a lead principal Geotechnical Professional Engineer provides our clients with the diversity and depth of skills required to successfully deliver critical project enhancing assessments and recommendations to assist with the critical decision-making process.

Our experience, gained since our incorporation in 1991 has provided NOA with extensive knowledge concerning the soils conditions and other geographical characteristics throughout the northern California area environment. This knowledge and appreciation of the regional geographical area ensures that all existing soil conditions are fully understood long before they will impact project budgets and schedules.



Preliminary Site Stability Assessment

  • Site Visit
  • Sample Borings
  • Preliminary Reporting
  • Review Aerial Surveys

Subsurface Exploration and Sampling

  • Drilling
  • Test Pits
  • Geotechnical Report
  • Geophysical Testing

Foundation Engineering

  • Settlement Analysis
  • Retaining Wall Design
  • Foundation Report
  • Deep/shallow Foundation Design
  • Distressed Foundation Assessment
  • Sub-grade Improvement
  • Pavement Design
  • Dams and Levees

Problem Soil Site Analysis

  • Expansive Soils
  • Landslides
  • Slope Stability
  • Soils Reports
  • Liquefaction
  • Forensic Investigations
  • Fault Investigations

Geotechnical Instrumentation and Monitoring

  • Site Evaluation
  • Instrumentation Program Design
  • Install and Setup
  • Automated Data Acquisition Systems (ADAS)
  • Site and Remote Monitoring
  • Custom Instrumentation

Geophysical Testing

  • Seismic Refraction
  • Electrical Resistivity
  • Ground Penetrating Radar
  • P/S Wave Survey

Laboratory Testing and Analysis

  • Soils and Aggregate Laboratory Testing, CCRL, AMRL
  • CALTRANS Certified
  • DSA Certified
  • AASHTO Certified
  • U.S. Army Corps of Engineers

Certified Construction Plan Review

  • Geotechnical Recommendation Conformance
  • Peer Review