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 2 of 11 • Prepare a revision of the existing Terraphase Site-Specific Health and Safety Plan to incorporate Terraphase scope during construction of the Stabilization Project. • Prepare the project QA Checklist. • Prepare templates for all reporting and documentation to be completed by Terraphase during the Stabilization Project. • Plan, facilitate, and document minutes for the project kickoff meeting. • Review, provide comments, and/or approve the following initial Contractor submittals: o Stabilization Operations Plan o Stabilization Construction Quality Control Plan o Fill Work Plan and Schedule o 811 tickets and utility response information o Construction Health and Safety Plans o Stabilization Construction Schedule (initial) o Dewatering System Work Plan (if submitted during this phase, not required for initial mobilization) o KMEP vehicle crossing approval • One half-day site visit for on-site coordination/planning with the Contractor (including possibly facilitating Contractor utility clearance if needed) and City and/or to attend the project kickoff meeting. The assumed duration of this phase, based on review of the provisionally awarded contractor’s proposal, is 3 work weeks. Task 2: Mobilization/Site Setup Phase Engineering, CM, Compliance Management The Mobilization/Site Setup phase of the project is defined as the period beginning with Contractor mobilization to the site and ending with the initiation of sludge-soil-cement stabilization operations. Construction activities completed during this phase will be described in the initial Contractor schedule and submittals, but is expected to include continued submittal preparation and review, underground utility coordination, installation of the Contractor’s temporary construction support facilities, setup of environmental controls, delivery and setup of stabilization construction equipment, delivery and staging of materials, demolition of site features as described in the plans and specifications, stabilization work platform construction, and initial stockpile management. Terraphase will provide engineering/QA, CM, and CGP compliance management as described in the Engineering, Construction, and CGP Compliance Management Scope of Work described above during the Mobilization/Site Setup phase of the project and as further detailed below: • Conduct on-site engineering, CM, and compliance field oversight and technical assistance: o Terraphase staff level field manager: 1 full day on site during contractor mobilization and site setup, and full time on site during site demolition. The Terraphase field manager will perform the following activities when on-site:  Oversee Contractor operations, including observing and confirming that Contractor’s quality control operations are in accordance with the approved Contractor Construction QC Plan. Docusign Envelope ID: 273A48E5-126B-49E9-B9E2-7FB9D28A1969