BAI conducted a geotechnical analysis and landslide mitigation study for a private property in Fairfax, CA. In addition to the geotechnical and slope stability study BAI worked with a structural engineer to design and install the landslide repair.
BAI conducted a bluff erosion study and geotechnical analysis of a landslide at Bowling Ball Beach near Point Arena. The landslide analysis included slope stability analysis and the installation of slope inclinometers to measure the movement of the slide.
BAI conducted a geotechnical and coastal bluff study for the remodel of the former Greenwood Pier Inn in Elk, CA. The project include bluff erosion rate calculations, soil and rock properties, construction observation, materials testing, concrete and reinforcing steel inspections.
For this recently finished project, BAI provided full-time construction observation, geotechnical testing, and on-site engineer services.
Our Caltrans-certified field and laboratory testing staff provided quality control testing to ensure construction performance according to project specifications. Our project engineer provided added value by also performing full time public works inspections.
Project Features:
BAI was contracted by the City of Santa Rosa to perform an integrated geotechnical investigation and environmental site assessment (ESA) for the proposed Lower Colgan Creek Restoration Project in Santa Rosa, California. Lower Colgan Creek is part of the Agency’s flood control system. BAI’s geotechnical and environmental data will be used to develop specifications for a 6,523-linear foot stretch of channel that will be re-contoured by grading into a 7,281-linear foot, more natural, meandering configuration with a restored riparian habitat.
Based on the findings of the Phase I ESA, BAI designed a Phase II soil sampling and analytical testing program that provides soil chemical characterization for use by the future grading contractor. BAI integrated the Phase II soil sampling with the geotechnical subsurface investigation that provided a value added service for the client.
BAI services for Lower Colgan Creek Restoration Project included document review and research, Phase I and Phase II ESAs, subsurface exploration and monitoring well installation, soil and groundwater sampling and laboratory testing, and engineering and geologic analyses, to provide conclusions and recommendations regarding:
BAI delivered a comprehensive report of findings that summarized the results of our reconnaissance and subsurface exploration from both the geotechnical and environmental standpoints. This report will be used in the preparation of the construction specifications when the project goes out to bid.
As part of the Stacy Witbeck/Herzog team, BAI performed geotechnical investigations and geologic hazard evaluations along the length (approximately 41 miles) of the Initial Operating System One (IOS-1). This stretch included investigations for bridge abutments at 10 bridge replacements, new track, and dozens of grade crossings.
Our work consisted of researching available pertinent reports and existing data for all 14 station sites and 10 bridge sites, conducting subsurface geotechnical investigations at station locations, replacement bridge sites, and at over 100 key locations throughout the rail alignment. Our investigations targeted geotechnical factors that may influence design and construction of fills, bridges, and station elements. Project challenges included developing efficient, effective approaches for addressing weak, compressible or expansive surface soils, liquefaction potential in response to earthquake shaking, settlement of bay mud under fill, pile driving through bay mud into hard Franciscan rock, and shallow groundwater.
Specific challenges included the following:
BAI worked with OPAC Engineers and the County of Sonoma, Department of Transportation to investigate the foundation conditions for a replacement bridge in the heart of Dry Creek Valley, Sonoma County. BAI overcame site access challenges to drill deep test borings at each abutment and one boring in the creek channel (see drill rig in photograph). BAI deftly navigated regulations regarding drilling within the river channel at the appropriate times so as to protect the resources from disturbance during the investigation.
BAI worked with OPAC Engineers and the County of Sonoma, Department of Transportation to investigate the foundation conditions for a replacement bridge over the South Fork of the Gualala River in the steep coastal ranges of Sonoma County. BAI overcame site access challenges to drill deep test borings at each abutment and one boring in the river channel (see drill rig in photograph). We also investigated the existing cut slope conditions on the west side of the bridge to give recommendations for cutting further into the slope, thereby increasing bridge approach visibility and safety. BAI deftly navigated regulations regarding drilling within the river channel at the appropriate times so as to protect the resources from disturbance during the investigation.