SF Bay Trail, Crockett to Martinez, Martinez, California
As a consultant to Contra Costa County in 2002, Cal Engineering & Geology provided the geotechnical engineering, preliminary civil design, and planning services for the conversion of the 1.7 mile long abandoned section of Carquinez Scenic Drive between Ozol and Port Costa in Contra Costa County. The section of the road, which was being studied, was abandoned by the county in 1983 following the development of several large landslides which made the road impassable. The geotechnical investigation completed for the project included drilling of 14 exploratory borings, laboratory testing, geologic mapping, and preparation of a preliminary geotechnical report. The Design Alternatives Report provided conceptual level alternatives for addressing the geotechnical hazards along the road. Site specific and generalized typical details for repairs consisting of tieback retaining walls, geogrid reinforced embankments, stabilization piles, soldier beam and lagging walls, and pavement stabilization were developed and presented with preliminary engineer’s estimates.
In 2011, Cal Engineering & Geology was once again retained to provide geotechnical engineering and value engineering services on the project, this time as a subconsultant to the East Bay Regional Park District, who would develop the final design and construct the federally funded trail. CE&G was involved in the value engineering process to assist the design team to optimize the trail configuration at the large landslides. The supplemental geotechnical investigation completed for the project included drilling of 26 additional exploratory borings, laboratory testing, geologic mapping, and preparation of a design and materials report in Caltrans format complete with Log of Test Boring sheets. CE&G recently provided observation of pile drilling for debris walls and retaining walls.