Item 17 - Agreements for On-Call Geotechnical Engineering Services

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02 1 Scope of Services and Schedule Based on our review of the City's RFP, we understand that our services will include as -requested geotechnical engineering services for various types of projects located throughout the City of Santa Ana. The RFP indicates that the projects may include street pavement, traffic signals, underground utilities, buildings and park improvements. The anticipated scope of work includes inspection and testing for construction involving grading, soils, base material, reinforced concrete and masonry, asphalt concrete, structural steel, and painting. Ninyo & Moore can provide the anticipated services in the RFP. Our services will be performed in accordance with applicable laws of the State of California and the requirements of the City of Santa Ana guidelines and ordinances, OSHA Construction Industry Standards, California Code of Regulations, South Coast Air Quality Management District Regulations, and other applicable codes. Testing will be per- formed in accordance with the latest addition of the Standard Specifications for Public Works Construction ("Green book"), Caltrans, ASTM and applicable standard test methods. We have included a scope of services for soils and materials testing and special inspections. Site specific scopes of work will be developed for each specific project assignment. Example scopes are provided below. t-y - • Project coordination, including meeting with the representatives of the Agency and their design team to discuss our scope of work. • Review of preliminary project plans, geologic and seismic hazard maps, and readily available geotechnical reports to evaluate possible geologic hazards that may impact the proposed construction. • Acquisition of permits necessary to proceed with our subsurface evaluation. • Geotechnical site reconnaissance to document the site conditions and to select and mark the proposed excavation locations for underground utility location. • Drilling, sampling, and logging of small -diameter and/or large -diameter exploratory borings and/or excavation of exploratory test pits. The depths of the excavations will depend on the details of the proposed project and site location. Traffic control will be performed, as appropriate, in general accordance with the W.A.T.C.H. manual. • Laboratory testing of representative soil samples to evaluate the soil characteristics. Laboratory testing may include in -situ moisture and dry density, gradation, maximum density and optimum moisture content, consolidation and expansion potential, expansion index, consolidation, shear strength, corrosivity and sulfate content, and R-value testing. • Data compilation and geotechnical analysis of field and laboratory data. Our analyses will address the following: • Suitability of the site for the proposed construction from a geotechnical perspective. • Description of the site geology and on -site soils anticipated during construction, including an evaluation of geologic hazards that might be present at the site. • Evaluation of slope stability under static and seismic conditions. • Excavation and compaction requirements, including suitability of the on -site soils for use as fill and/ or trench backfill. • Analysis of the temporary stability of the trench excavations and shoring pressures, including allowable lateral earth pressures and allowable passive pressures for proposed trenches, as appropriate. • Evaluation of the depth to the groundwater table and potential areas of dewatering, as appropriate. • Evaluation of potential settlement. • Evaluation of the potential for liquefaction. • Evaluation of the corrosion potential of the on -site soils. • Evaluation of pavement design for the proposed roadway sections, as applicable. Ninyo & Moore I City of Santa Ana On -Call Geotechnical Engineering RFP No. 23-123 1 PO4-04193 I August 28, 2023 8