Item 17 - Agreements for On-Call Geotechnical Engineering Services

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Earth Mechanics, Inc. l3eolecnn�cal 6 Es�inquaxe Engineering Roadways and Pavements EMI has provided geotechnical services for multiple roadway improvement projects for cities and counties. These projects generally involved rehabilitation, reconstruction and/or widening of the existing roadways and construction of new roadways. EMI's scope of work generally involves pavement condition survey, coring existing asphalt or concrete pavement to assess the conditions of the pavement structural sections, collecting soil samples to assess the subsurface conditions, assessing expansion potential of subsurface soils and providing mitigation measures, providing rehabilitation options, recommending pavement structural sections for full depth replacement or new construction and preparing geotechnical report to present our findings and recommendations. Interchanges, Bridges, and Freeway Widening EMI has provided geotechnical services for dozens of interchange and freeway improvement projects, which generally involved interchange reconfigurations, mainline and ramp widening, and local roadway widening. Improvements included new bridges or bridge widening, earth retaining structures, drainage structures, fill embankments, cut slopes, flexible and rigid pavement sections, sound walls, infiltration basins, and overhead sign structures. On numerous projects, we have been involved from the project planning phase through final design and construction support. We have conducted literature searches, reviewed published geologic maps and other geotechnical documents, and conducted site reconnaissance and geologic mapping to support the preliminary phase of design. We secured required encroachment permits; conducted field investigations and laboratory testing; performed geotechnical analyses and design; and prepared geotechnical and foundation reports for final design. Earth Retaining Systems EMI has provided foundation investigation and geotechnical design services for numerous retaining structures throughout California. We have experience with conventional cast -in - place walls, sub -horizontal ground anchor walls, walls with vertical anchors, soil nail walls, Mechanically Stabilized Earth (MSE) Walls, secant pile and tangent pile walls, and permanently strutted walls. We have also conducted evaluations and provided recommendations for temporary shoring walls (soldier beam and lagging, sheet pile) up to 60 feet tall. During the course of engineering the walls, EMI evaluated the use of shallow and deep foundations, provided lateral pressure recommendations, assessed the potential for geologic loading against walls due to adverse bedding, estimated bond strength for vertical and sub -horizontal ground anchors and soil nails, provided un-bonded and bonded length recommendations for ground anchors, and evaluated the global stability of retaining walls. Proposal (RFP No. 23-123) City of Santa Ana On -Call Geotechnical Engineering Services