Geotechnical Investigations
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AC Engineering Inc. provides comprehensive geotechnical investigation reports and design recommendations to support a wide range of projects, including new residential developments, hillside additions, retaining walls, ADUs, swimming pools, and OWTS (septic systems). With extensive experience across Marin County and the East Bay, AC Engineering delivers practical, site-specific solutions for landslide repairs, foundation underpinning, slope stabilization, retaining structures, and both residential and commercial construction. |
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AC Engineering’s expertise in local geology and construction feasibility ensures that every project is approached with long-term stability, safety, and performance in mind. AC Engineering coordinates subsurface drilling (ASTM D1586 exploratory borings), laboratory testing, and construction observation services in-house or through trusted subcontractors and field technicians, allowing us to deliver accurate subsurface data, cost-effective engineering recommendations, and reliable oversight during installation. We perform true ASTM-compliant geotechnical investigations on every project, providing a level of rigor that exceeds code-minimum industry practice. All sampling and testing are completed in accordance with ASTM D1586 and related standards to obtain verifiable soil parameters that structural engineers and building officials can rely on, rather than low-cost alternatives such as shallow hand auger holes or simple test pits. This approach reduces the risk of foundation movement, drainage failures, and costly change orders, while providing the defensible documentation required for permitting and lender review. Clients benefit from higher-confidence recommendations, reduced liability across the design and construction team, and foundations built on real data, not assumptions.
Whether your project is on the soft bay mud flats of Corte Madera, the steep slopes of Mill Valley, or the decomposed granite of Inverness, AC Engineering offers the expertise and insight needed to support your project’s long-term performance and success.
What is a Geotechnical Investigation?
A geotechnical investigation report (soil report) evaluates soil, rock, and groundwater conditions at a project site. It provides the foundation for safe, cost-effective engineering and construction by determining critical factors such as site stability, bearing capacity, settlement potential, and seismic risks like landslides, faults, or liquefaction. This information is essential for the design of foundations, retaining structures, slopes, pavements, and other infrastructure elements.
AC Engineering Inc. offers Geotechnical Reports and Design Recommendations for:
New single-family residence (SFR)
New additions to existing SFR
New accessory dwelling units (ADU)
Replacement (underpinning) foundations for existing SFR
Retaining walls
On-site Wastewater Systems (OWTS)
Whether your project is on the soft bay mud flats of Corte Madera, the steep slopes of Mill Valley, or the decomposed granite of Inverness, AC Engineering offers the expertise and insight needed to support your project’s long-term performance and success.
What is a Geotechnical Investigation?
A geotechnical investigation report (soil report) evaluates soil, rock, and groundwater conditions at a project site. It provides the foundation for safe, cost-effective engineering and construction by determining critical factors such as site stability, bearing capacity, settlement potential, and seismic risks like landslides, faults, or liquefaction. This information is essential for the design of foundations, retaining structures, slopes, pavements, and other infrastructure elements.
AC Engineering Inc. offers Geotechnical Reports and Design Recommendations for:
New single-family residence (SFR)
New additions to existing SFR
New accessory dwelling units (ADU)
Replacement (underpinning) foundations for existing SFR
Retaining walls
On-site Wastewater Systems (OWTS)