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City of San Leandro City Council Meeting Date: July 7, 2025 Agenda Number: 5.i. Agenda Section: CONSENT CALENDAR File Number: 25-302 File Type: Staff Report Adopt a Resolution to Approve and Authorize the City Manager to Execute Amendment 4 to a Consulting Services Agreement with Terraphase Engineering, Inc. For Construction Engineering and Construction Management Services for a Treatment Wetland at the City of San Leandro Water Pollution Control Plant, Increasing the Not-to-Exceed Amount by $403,601 for a Total Not to Exceed Amount of $1,581,464 COUNCIL PRIORITY • Infrastructure SUMMARY In October 2019, Terraphase Engineering was selected through a competitive process as design consultant for the Treatment Wetland Project at the Water Pollution Control Plant (WPCP). In addition to design services, Terraphase offers inspection and construction management services. Staff requests an amendment to the Terraphase agreement to include construction management services and inspection services for Phase 1 of the Treatment Wetland project and additional scope to support the bid process for Phase 2 of the project . RECOMMENDATIONS Staff recommend City Council adopt a Resolution to approve and authorize the City Manager to execute an amendment to the Consulting Services Agreement (CSA) with Terraphase Engineering, Inc. for construction management and inspection services for Treatment Wetland project for an additional $403,601 for a new total not to exceed amount of $1,581,464 . BACKGROUND Since 2017, the City has been working to convert a disused treatment basin at the WPCP into a Treatment Wetland. The purpose of the Treatment Wetland project is to treat a portion of the WPCP discharge water to remove nitrogen and other contaminates. In addition, the project will include enhancement of wetland habitat along the San Francisco Bay Trail and serve as a demonstration of cost-effective nature-based solutions for contaminant removal. The WPCP Treatment Wetland Project will utilize an existing, out of service treatment pond, to be completed in two phases. The bottom level of the pond needs to be raised for final construction of the project; there is currently a layer of sludge in the pond. The first phase will place soil stockpiled from the 2014 WPCP upgrade project into the basin and mix it with cement to stabilize the base layer of the pond. After this is complete, additional fill soil will be imported to bring the level of the pond up to the final height. During the second phase, a liner, a terraced slope with wood chips and additional treatment equipment will be installed. The entire area will then be planted with native plants. The project is split into two phases because the City’s geotechnical advisors recommended filling the pond and then allowing time for settling, which reduces the likelihood of future problems with Page 1 City of San Leandro Printed on 9/4/2025