CHJ Consultants has performed thousands of geotechnical investigations, ranging from single-family residences to large commercial developments. Subsurface investigations are performed by staff geologists, who are supervised by Professional Geotechnical Engineers and Certified Engineering Geologists. Subsurface soils are obtained with the aid of a truck-mounted drill rig or tractor-mounted backhoe. The staff geologist classifies and logs the soils encountered for review by the geotechnical engineer and/or engineering geologist. Soil samples are collected and returned to our laboratory for testing and evaluation.