Insight
When In-Situ Testing Adds Value
CPT, pressuremeter, DMT, and vane shear testing can improve characterization where SPT-only assumptions are too conservative.
In-situ testing is useful where soft soils, variable fill, or difficult access conditions make conventional correlations less reliable.
Reference projects such as I-895 show how supplemental CPT data can materially change design assumptions for strength, modulus, and capacity.