For any new construction in Anaheim, a thorough geotechnical foundation investigation is the critical first step, not merely a regulatory checkbox. Our work begins by characterizing the specific subsurface conditions shaped by the local geology, which transitions from the alluvial sediments of the Santa Ana River plain to older, more consolidated Pleistocene terraces. We directly address the requirements of the City of Anaheim Building Division and the California Building Code (CBC), which mandates site-specific studies to mitigate risks from primary hazards like differential settlement, potential liquefaction in areas with shallow groundwater, and the seismic demands of nearby fault systems. This process often starts with a targeted geotechnical investigation or strategically placed exploratory test pits to visually log shallow strata and identify any undocumented fill.
Our methodology is built upon a strict adherence to ASTM International standards, ensuring defensible data for foundation design. Subsurface exploration typically involves drilling boreholes to perform the Standard Penetration Test (SPT), which provides a direct correlation to soil density and consistency through the N-value, while simultaneously recovering disturbed samples. For a more precise assessment of soil stiffness without the limitations of the SPT, we deploy advanced in‑situ testing methods, notably the Flat Dilatometer Test (DMT), which is exceptionally sensitive for profiling sedimentary strata common in the Anaheim basin. In fine-grained soils where settlement is a primary concern, we obtain high-quality, undisturbed samples using Shelby tubes, which are then sealed and transported to our geotechnical laboratory for consolidated-undrained triaxial shear and one-dimensional consolidation testing to derive engineering parameters.
These investigation techniques are tailored to the diverse project types shaping Anaheim’s landscape, from the master-planned communities in Anaheim Hills to large-scale commercial infill projects near the Platinum Triangle. A foundation design for a tilt-up warehouse on a flat, historically agricultural parcel demands a different analytical focus—primarily on near-surface bearing capacity and slab support—compared to a deep excavation for a hotel’s subterranean parking structure, where shoring design and base stability are paramount. For infrastructure, such as bridge widenings or stormwater detention basins, we must also verify compaction through a field density test using the sand cone method, ensuring engineered fills meet the project’s structural specifications and the City’s grading ordinance requirements.
Our process delivers a cohesive package that transforms raw field data into a clear geotechnical narrative. After completing the drilling, In-Situ, and laboratory analysis, we synthesize the findings into a single, actionable report. This document presents our bearing capacity and settlement analyses, provides lateral earth pressure coefficients for retaining walls, and offers specific, constructible recommendations for shallow or deep foundations. The ultimate deliverable is not just a soil profile but a risk management tool that provides Anaheim’s developers, structural engineers, and contractors with the confidence that the foundation system is optimized for both performance and cost, ensuring structural resilience against the region's demanding seismic and soil conditions.