Subsurface Investigation

An accurate, detailed, and complete subsurface investigation program is critical for any size geologic or geotechnical related improvement project. CE&G provides a pragmatic and site-specific approach when developing a subsurface exploration program to meet the needs of the project and the requirements of the project’s owner, developer, design team, and regulatory agencies.  CE&G has extensive experience with Federal, State, County, and local agencies to obtain the required permitting, utility clearances, site access, and authorization to complete the work.  CE&G has developed company-wide standards when logging, sampling, and documenting the subsurface explorations.  We utilize licensed geologists and engineers to log and manage the subsurface exploration operations.  We are familiar with the utilization of specialized and limited access equipment to complete explorations throughout the State of California.  Logging standards and manuals utilized by CE&G include ASTM 2488/2487, Caltrans, Department of Water Resources, and Division of Safety of Dams.  Subsurface exploration programs have been completed within, but are not limited to, the following environments:

  • Over-water
  • Shorelines and marshlands
  • Dams and Levees
  • Steep hillside terrain
  • Landslides
  • Inside structures and confined spaces; and
  • Sensitive habitats

Types of subsurface explorations completed by CE&G consist of:

  • Exploratory Borings (Auger, Rotary Wash, Sonic, etc.)
  • Rock Coring
  • Exploratory Test Pits
  • Fault Investigation and Trenching
  • Cone Penetration Testing (CPTs)
  • Geoprobes
  • Geophysical (Seismic Refraction, Ground Penetrating Radar, Electrical Resistivity, etc.)
  • Hand Excavation and Augering
  • Environmental