Blue Book Article 7.02.010
A geotechnical (foundation and soils) investigation is performed to evaluate the soil, rock, ground water, geologic, and seismologic conditions that potentially affect the design and construction of a proposed development or improvement that will include structures. Specifically, the geotechnical investigation provides recommendations for design of foundation systems and subterranean structures, earthwork and excavation, ground water control, design of paving and flatwork, slopes (including construction and stabilization), and for other soil work related to the project. In seismically active areas, the geotechnical investigation evaluates the hazards associated with geologic and seismologic conditions that may significantly impact the project. The geotechnical report needs to address these hazards and provide design recommendations to mitigate or account for these hazards.