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REV: 02-16-24 SK Task 7 – Optional Geotechnical Investigation and Report for $19,800 LS •Upon written task authorization from City, Consultant will subcontract Haley & Aldrich to obtain site specific geotechnical design parameter data and recommendations for the Project. •Prior to completing the subsurface exploration, City will obtain permits from San Mateo County Environmental Health Services Division and the exploration locations marked for Underground Service Alert (USA). •Prior to completing the subsurface exploration, City will coordinate with adjacent private property owner. •During subsurface exploration, City staff will be onsite to provide site access. Consultant will explore the subsurface conditions in the vicinity of Project area by drilling and sampling geotechnical one (1) boring along the top of the channel with the right-of-way. This exploration will be performed by the Consultant team. The borings will be drilled using a portable Minuteman drilling rig equipped with solid flight augers. Samples of the site materials will be recovered from the borings using California Modified and/or Standard Penetration samples by Consultant. Selected samples recovered from the borings will be returned to the Consultant team’s soils testing laboratory for index properties, consolidation testing, and/or strength testing. •It is estimated that borings will be advanced to between approximately 20 and 35 feet deep or approximately 10 feet below anticipated temporary shoring pile depths. Soil cuttings will be collected by the Consultant’s team in drums and disposed of in accordance with state, federal, and local regulations. Work anticipated to dispose of the cuttings assumes that the cuttings will be classified as non-hazardous materials. •Exploration work is subject to prevailing wage and is reflective of the task budget. •The results from the field exploration, laboratory testing, and background research will be used by Consultant as the basic for development of geotechnical design parameters for replacement of concrete channels. Seismic accelerations will be provided using USGS data and CalTrans methods in lieu of site-specific soil acceleration analysis. Consultant will prepare a memo, which will include the following: o Introduction including site location, description, and purpose of the investigation. o Subsurface conditions and geology. o Loading and groundwater design criteria for temporary shoring and permanent structure design. o Analysis and channel design recommendations. o Boring logs and test results from the exploration programs, and . o Findings and geotechnical recommendations pertaining to the design parameters for the planned project. •Deliverables: A copy of the Geotechnical Design Memorandum will be provided to the City. ATTY/AGR.2024.016/Wood Rodgers, Inc. (1891 Palm Avenue Creek Wall Rehabilitation) (Page 15 of 17)