Fresno's expansion across the eastern San Joaquin Valley has pushed development onto increasingly complex alluvial fan deposits where traditional drilling methods often fall short. The city sits at the apex of the Kings River alluvial fan, a geological setting that produces dramatic soil variability within distances of just a few hundred feet. When the California High-Speed Rail project drove exploratory work through downtown Fresno, the engineering teams relied heavily on CPT testing to map the transition zones between loose floodplain silts and the deeper, denser Pleistocene-age sediments that provide reliable bearing capacity. For commercial builders and foundation engineers working within city limits, the CPT test has become the preferred method for obtaining continuous, undisturbed soil profiles without the delays and sample disturbance inherent in conventional drilling. Our team has logged thousands of linear feet of CPT soundings in Fresno County, from the Tower District to the industrial corridors along Highway 99, and we understand how local depositional history directly influences foundation design decisions.
Continuous CPT profiling eliminates the 5-foot data gaps that plague standard penetration testing in stratified alluvial soils.
