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<br /> <br />1300 Clay Street, Suite 1000 | Oakland, California 94612 | www.terraphase.com <br />June 11, 2025 <br />Hayes Morehouse <br />Water Pollution Control Plant Manager <br />City of San Leandro <br />3000 Davis Street <br />San Leandro, California 94577 <br />sent via email to: HMorehouse@sanleandro.org <br />Subject: Proposal for Stabilization Project Construction, Engineering, and Compliance <br />Management and Phase 2 Preconstruction Engineering and Management at <br />the City of San Leandro Water Pollution Control Plant (WPCP) Former Polishing <br />Pond, San Leandro, California <br />Dear Mr. Morehouse: <br />This proposal describes the scope of work and requested budget for Terraphase Engineering (Terraphase) to <br />provide to the City of San Leandro (City) with engineering and construction support services for <br />implementation of the City WPCP Treatment Wetland Project as defined in the following overview: <br />1. Engineering oversight/quality control, construction management, and State Water Resources Control <br />Board (SWRCB) Stormwater Construction General Permit (CGP) compliance management during <br />construction of the Phase 1 sludge-soil-cement stabilization and fill project (Stabilization Project) at the <br />WPCP former polishing pond, as requested by the City during an April 18, 2025 project meeting. <br />2. Additional Engineering and Construction Management Support during preconstruction planning and <br />procurement of the Phase 2 Treatment Wetland Construction Project (Phase 2) as discussed with the City <br />in May 2025. <br />The Stabilization Project generally includes the following construction scope: <br />1. Demolition, clearing and grubbing, of the entire perimeter and surrounding working area of the former <br />polishing pond. <br />2. Sludge-soil-cement stabilization of the former polishing pond sludge surface using soil from the on-site <br />soil stockpile. <br />3. Import, placement, compaction, and grading of earth fill atop the stabilized pond surface to proposed <br />final pond surface design elevation. <br />4. Installation of a temporary pond surface dewatering system. <br />Terraphase prepared Issued for Bid engineering design documents for the Stabilization Project and is <br />supporting the City during construction bidding and procurement for the Phase 1 Stabilization Project. The <br />City will serve as Owner of the project and hold all construction contracts, with Terraphase proposing to <br />provide full engineering, construction quality assurance (QA), construction management (CM), and CGP <br />compliance support during construction of the Stabilization Project. <br />Based on our deep knowledge of the project and sharing the City’s objectives of efficient and high-quality <br />execution of the Stabilization Project, we have developed a “combined services” approach where an