Columbia West conducts geotechnical site investigations for a variety of public and private projects in Oregon and Washington. Field investigations are conducted using soil boring equipment, mechanized heavy construction excavators, or other specialized equipment to observe subsurface soils and collect relevant data. A geotechnical site investigation report varies depending upon proposed development, but generally includes descriptions of the site and subsurface profile and a summary of geologic, seismic, hydrologic, and topographic characteristics. Cone penetration testing, pre-bored pressuremeter testing, standard penetration testing, and other in situ tests are conducted during field exploration to determine soil properties. Design recommendations and supporting geotechnical engineering analyses are provided for foundations, earthwork, drainage, slope stability, lateral earth pressure, asphalt and concrete pavement, erosion potential, and utility installation. Detailed figures, subsurface exploration logs, and analytical laboratory test results are also included.