American Geotechnics

Geotechnical Engineering

Our professional engineering and geology staff are highly experienced and committed to meeting the needs of our clients with cost-effective solutions tailored to client needs.

We prepare detailed scopes of work, provide accurate cost estimates, and maintain a stellar safety record.

We offer a full range of professional geotechnical engineering services:

  • Pavement investigations, analyses, and design, including AASHTO Pavement ME
  • Deep and shallow foundation design
  • Slope stability and rockfall protection analyses
  • Foundation remediation
  • Subsurface investigations
  • Retaining wall and shoring design
  • Embankment design
  • Test pile foundation design and monitoring
  • Landslide investigations and remediation
  • Construction vibration monitoring
  • Aggregate and quarry source assessments
We specialize in state-of-the-art approaches to pavement design, beginning with collection of thousands of data points using non-invasive ground penetrating radar (GPR) and falling weight deflectometer (FWD) testing and confirming the data with limited drilling. We perform further testing in our ITD qualified laboratory and then cross reference the data for a true, comprehensive multipoint analysis leading to superlative and cost-effective pavement design.

Field Investigation

We have extensive experience capturing relevant field data using our specialized field equipment.

Field Investigation Services

  • Foundation
  • Landslide
  • Slope and wall
  • Rockfall
  • Pavement subgrade
  • Subsurface infiltration
  • Asphalt and concrete coring
  • Bridge deck scanning


  • Falling weight deflectometer (FWD)
  • Dynamic cone penetrometer (DCP)
  • Ground penetrating radar (GPR)
  • Custom pavement investigation drill rig
  • Specialized pavement coring and drilling
  • Geotechnical drilling and coring

Laboratory Testing

Our ITD qualified full-service laboratory performs strength and deformation testing for engineering design.

Lab personnel are WAQTC qualified and dedicated to applying stringent test standards and controls with precision.

We are the only private laboratory in Idaho capable of performing the AASHTO T 308 Resilient Modulus Test.

We perform a wide variety of high-end testing for our clients:

Asphalt Concrete Testing

  • Unit Weight of Core
  • Compressive Strength of Concrete
  • Rice Specific Gravity from AC Cores
  • Asphalt Content and Aggregate Gradation – NCAT
  • AC Core Volumetrics (for AASHTO ME design)

Aggregate Testing

  • Fracture Face
  • Wood Particles
  • Absorption and Specific Gravity, Gravel
  • Unit Weight
  • LA Rattler (1000 Rev) LAR
  • Mortar Making Properties of Sand
  • Flat and Elongated Particles
  • Lightweight Pieces in Aggregate
  • Disintegration of Quarry Aggregates
  • Alkali – Silica Reaction
  • Mix Design of Cover Coat Material
  • Carbonate Content (calcite equivalent)
  • Mcleod Mix Design
  • Injurious Organic Matter
  • Absorption and Specific Gravity, Sand
  • LA Rattler (500 Rev) LAR
  • Sodium Sulfate Soundness
  • Cleanliness Value
  • Clay Lumps and Friable Particles
  • Idaho Degradation
  • Coating and Stripping Evaluation
  • Durability Index (Coarse or Fine Aggregates)
  • Alkali – Silica Reaction Additional Bar Set

Geosynthetics Testing

  • Shear and Peel

Corrosion Related Tests

  • Resistivity
  • Sulfates (soil elutriate)
  • Total Dissolved Solids
  • Total Metals in Soil (Pb, As, Cd, Zn)
  • Chlorides (soil elutriate)
  • pH
  • Thermo-Resistivity

Moisture Density

  • Standard Proctor Curve
  • Relative Density – Max & Min
  • Modified Proctor Curve
  • Harvard Miniature Compaction

Hydraulic Conductivity/Permeability Testing

  • Flexwall Permeability, Undisturbed
  • Flexwall Permeability, Additional Saturation Time (up to 1 week)
  • Permeability of Granular Soils using 10″ Constant Head Permeameter
  • Flexwall Permeability, Remolded
  • Permeability of granular soils using 4″ Constant Head Permeameter

Rock Testing

  • Compression Testing of Core
  • Cutting Core
  • Petrography, Full & Brief

Soil Classification

  • ASTM Visual-Manual Classification, baggie, 50# sack & tube
  • Organic Content
  • Atterberg Limits
  • Shrinkage Limits (includes Atterberg)
  • Full Gradation with Wash
  • Sand Equivalent
  • Pinhole Dispersion for dispersive soils
  • Water Content
  • Water Content/Dry Unit Weight, Ring sample, Shelby tube
  • Non-Plastic Classification
  • Specific Gravity of Soil
  • No. 200 Wash
  • Hydrometer to 0.002 mm (includes gradation)

Strength and Deformation

  • Laboratory Vane Shear
  • Pocket Penetrometer
  • Consolidated-Drained (undisturbed)
  • Consolidated-Drained (remolded)
  • Residual Strength Determination
  • Unconsolidated Undrained
  • Consolidated Drained
  • Undisturbed
  • Remolded
  • R-Value
  • Torvane
  • REMAC – Unconfined Compression of Soil (undisturbed)
  • Unconfined Compression of Soil (undisturbed)
  • Unconfined Compression of Soil (remolded)
  • Consolidated Undrained
  • Cyclic
  • Spring Loaded Compactor Method
  • Resilient Modulus

Volume Change

  • 1-D Consolidation
  • Supplemental Unload-Reload Cycles
  • Constant Strain (measuring swell pressure)
  • 1-D Swell or Settlement Potential of Cohesive Soils
  • Collapse Potential

Other Laboratory Services and Testing

  • Cement Treated Base Testing
  • Full Depth Reclamation and Cement Treated Base
  • Shipping
  • Trimming
  • Tube Cutting
  • Lab Crushing
  • Sample Disposal
  • Soil Cement Subgrade
  • Special Handling and/or Extraction
  • Mr Transport Tubes and Caps (disposable)
  • Remolding
  • Core Photos
  • Soil Sample Storage