Amendment No 4 Terraphase 07172025 Combined

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Amendment No. 4 to Consulting Services Agreement between City of San Leandro and Terraphase Engineering, Inc 7/17/25 for Treatment Wetland Design Services Page 4 of 11 during this phase if these are required when Terraphase staff are not already on site. If required, Terraphase will confirm the additional effort with the City, including potentially requesting additional budget. Task 3: Stabilization Phase Engineering, CM, Compliance Management The Stabilization phase of the project is defined as the period encompassing all sludge-soil-cement stabilization operations, ending with the completion of active stabilization operations and the beginning of post- stabilization fill placement. If there is overlap between stabilization and fill operations, the scope of work and assumed level of effort for this phase will continue until all stabilization operations have finished. Terraphase will provide all engineering/QA, CM, and CGP compliance management as described in the Engineering, Construction, and CGP Compliance Management Scope of Work described above during the Stabilization phase of the project and as further detailed below: • Provide full-time onsite engineering, CM, and CGP compliance field oversight and technical assistance: o Terraphase staff level field manager: Full time, assuming a Mon-Fri work week and maximum 50 hours per week, performing the following activities: • Oversee Contractor operations, including observing and confirming that Contractor’s quality control operations are in accordance with the approved Contractor Construction QC Plan. • Quantitative and qualitative documentation of construction progress, including preparing schematics of where work is complete, active work locations, where work has not started. • Track and manage contractor QC data, including noting the physical location of each QC sample location on project drawings. • Perform Engineer’s independent QA sampling. • Complete required daily SWPPP BMP inspections and support required weekly and monthly SWPPP QSD/QSP inspections. • Inspect materials received on-site against the Contractor’s relevant approved submittal. • Provide field support for review and resolution of RFIs, including potentially collecting data, coordinating with the Contractor, discussing potential means of resolution with the Contractor, off-site Engineering personnel, and the City, and documenting these discussions. • Provide field support for identifying, tracking, and resolving construction quality issues, including coordination with Contractor and City staff.  Support contract change management, including measuring/confirming change quantities, reviewing change requests, coordination with Contractor, Engineering personnel, and the City.  Conduct on-site pay application site meeting with Contractor prior to formal submittal and/or for review and recommendation to City after submittal.  Attending Contractor daily health and safety tailgate meetings. Docusign Envelope ID: 273A48E5-126B-49E9-B9E2-7FB9D28A1969