Foundation design in San Bernardino demands a rigorous understanding of the region's complex geology, shaped by the San Andreas and San Jacinto fault systems. Our geotechnical services address the challenges of alluvial fan deposits, liquefiable sands, and the potential for significant seismic activity, ensuring compliance with the 2022 California Building Code (CBC) and local city amendments. A thorough investigation is the critical first step, moving beyond simple borings to characterize the dynamic behavior of the subsurface materials that will support your structure.
We employ a suite of standardized In-Situ methods to derive engineering parameters in full accordance with ASTM International standards. Our field programs often combine the SPT (Standard Penetration Test) per ASTM D1586 with advanced CPT (Cone Penetration Test) per ASTM D5778 to create a continuous profile of soil behavior, which is essential for identifying thin, liquefiable layers. This data is further refined with specialized techniques like the Flat Dilatometer Test (DMT) and the Ménard pressuremeter test (PMT), which directly measure soil stiffness and deformation characteristics for settlement analysis under heavy structural loads.
This rigorous data collection directly supports the design of foundations for San Bernardino's most demanding projects, from logistics warehouses in the AllianceCalifornia district to essential public safety facilities and transportation overpasses. For projects where soil compaction is critical, such as engineered fills beneath slab-on-grade foundations, we verify density with the field density test (sand cone method) per ASTM D1556. When undisturbed strength parameters are required for advanced laboratory testing, our crews utilize undisturbed sampling (Shelby tube) techniques per ASTM D1587, preserving the soil fabric to accurately model settlement and shear strength.
The final deliverable is a geotechnical report providing clear, actionable recommendations for foundation type, allowable bearing pressures, and lateral earth pressures, translating complex data into constructible solutions. Our process, from initial site reconnaissance to final reporting, is built to manage the local permitting pathway with the City of San Bernardino. We provide the critical engineering data that allows structural designers to mitigate the risk of differential settlement and seismic damage, ensuring your foundation is a resilient, long-term asset.