Item 17 - Agreements for On-Call Geotechnical Engineering Services

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Earth Mechanics, Inc. l3eolernn�cal 6 Es�inquaxe Engineering will be logged in the field during the investigation, secured in their containers, and transported to the EMI soils laboratory. S Where traffic control is necessary to accomplish the field investigation, we will follow the lane closure requirements specified by the City or other agencies with local jurisdiction. If necessary, the field investigation can be conducted during the weekend or at night to minimize the impact to traffic. EMI will notify Underground Service Alert prior to the start of the investigation so that existing utilities are marked in the field before subsurface exploration. EMI will use subcontractors to perform drilling and traffic control setup. Subcontractor fees will be based on California Prevailing Wage rates. Deliverables: Boring Location Plan and Work Plan 5. Laboratory Testing Field logs of borings will be reviewed to select representative soil samples for laboratory testing. Various laboratory tests will be performed on soil samples to determine or derive their physical and engineering characteristics. Results of laboratory tests will be used for engineering analyses to develop geotechnical recommendations. The following soil tests are usually performed: ■ In -place Moisture & Density ■ Sand Equivalent ■ Grain Size Analysis ■ Expansion Potential ■ Atterberg Limits ■ Consolidation & Collapse Potential ■ Corrosivity ■ Maximum Density & Optimum Moisture Content ■ R-Value ■ Direct Shear & Unconsolidated-Undrained Triaxial Additional tests may be necessary depending on the proposed improvements and subsurface soil conditions. Laboratory tests will be conducted in accordance with ASTM Standards or California Test Methods. EMI will use subcontractors to perform some of the laboratory soil tests. 6. Geotechnical Engineering Analyses Results from the field investigation and laboratory testing will be used to develop idealized soil profiles and determine representative soil parameters for use in geotechnical analysis and design. Geotechnical analyses could include: ■ Evaluating the Stability of Cut, Fill, and Natural Slopes ■ Evaluating Settlement of Roadway Embankments and Deep Fills ■ Determining Lateral Pressures on Retaining Structures Due to Earth and Surcharge Loads ■ Determining Axial and Lateral Capacity and Settlement of Shallow and Deep Foundations ■ Designing Pavement Structural Sections ■ Assessing Liquefaction Potential of Subsurface Soils ■ Evaluating Static and Seismically -Induced Ground Subsidence ■ Assessing Site Response Due to Ground Shaking ■ Performing Soil -Structure Interaction Proposal (RFP No. 23-123) City of Santa Ana On -Call Geotechnical Engineering Services