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Marshall Hospital

Youngdahl Consulting Group, Inc. has provided numerous geotechnical investigations and geologic hazard reports for multiple expansions at Marshall Hospital complex in Placerville, California.

These projects have included several expansions to the original hospital including the new x-ray room, gift shop addition, seismic renovation, pneumatic tube project, and lounge administration facilities addition. New construction at the hospital complex has involved construction of the new acute care facility, a primary care facility, parking lots, SB1953 seismic compliance and an evaluation of the planned four-story hospital addition.

Our team understands the geotechnical and structural design requirements of the OSPHD, the jurisdictional agency for CCR Title 24 compliance; we have successfully undergone the review and approval process of OSHPD for the existing hospital and the construction of new facilities. Our geotechnical work has involved a review of existing geologic literature including an assessment of mining activity within the hospital area. We have completed several subsurface investigations which have included geophysical investigation for evaluation of seismic velocities for rippability purposes, down hole shear curve velocity testing, and development of site-specific seismic design criteria. Youngdahl has conducted a complete geologic hazard assessment of the site including geologic mapping, slope stability assessment, evaluation of expansive soil conditions and identification of potential geologic hazards. These evaluations have included evaluation of seismological data, calculation of earthquake ground motion, probabilistic seismic hazard, near source coefficients, normalized spectral response, and evaluation of settlement hazards. 

Based on the information generated during our studies, we have provided geotechnical reports which included descriptions of surface, soil, groundwater, and seismic conditions, conclusions regarding on-site liquefaction potential, recommended seismic design parameters, recommendations for site preparation and grading including dewatering requirements and temporary excavations, design criteria for spread footings and/or deep foundation systems, recommendations concerning slab-on-grade floors, design criteria for retaining walls and pavement design for roadways and parking areas. Our geotechnical work was followed by providing Quality Control and Assurance services during new construction. Earthwork observation and testing services have been performed during all site grading, utility trench installation and retaining wall construction. Youngdahl has evaluated multiple mine features during construction and provided recommendations for remediation of mining hazards. Special inspection services have included quality control of all concrete, masonry, steel and asphalt under the jurisdiction of OSHPD.

Project Details


Placerville, CA 95667, USA


Marshall Medical Center


Geotechnical Engineering
Laboratory Testing
Materials Testing & Special Inspection

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