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<br />1300 Clay Street, Suite 1000 | Oakland, California 94612 | www.terraphase.com <br />Technical Memorandum <br />To: Nick Thom <br />City Engineer <br />City of San Leandro <br />3000 Davis Street <br />San Leandro, California 94577 <br /> <br />From: Kevin Long, Principal <br />Linda Logan, Senior Associate <br />Peter Zawislanski, Sr. Principal <br />Lucas Paz, Principal <br />Terraphase Engineering Inc. <br />cc: Hayes Morehouse <br />Water Pollution Control Plant Manager <br />City of San Leandro <br />3000 Davis Street <br />San Leandro, California 94577 <br /> <br />Date: January 31, 2024 Project No.: 0364.003.001 <br />Subject: Risk-Based Evaluation for Reuse of Stockpile Material for the Proposed Treatment Wetland <br />Project – City of San Leandro Water Pollution Control Plant <br /> <br />On behalf of the City of San Leandro, Terraphase Engineering Inc. (Terraphase) has prepared this <br />Technical Memorandum to present a risk-based evaluation of the reuse of stockpiled material for the <br />proposed treatment wetland project (the Project) at the City of San Leandro Water Pollution Control <br />Plant (WPCP). The goal of the Project is to add stockpiled soil to the existing wet-weather storage basin <br />(former polishing pond) used by the WPCP to convert it into a wastewater treatment wetland for <br />pollution reduction, habitat enhancement, and shoreline resiliency (LSA 2020a). This memorandum <br />incudes a description of the site setting, an overview of the proposed project, a summary of the <br />sampling performed to support the evaluation, and an evaluation of the potential for risks to human <br />health and ecological receptors following construction of the proposed wastewater treatment wetland. <br />As presented in this memorandum, the concentrations of chemicals of potential concern (COPCs) in <br />both stockpiled soil and sludge from the storage pond, do not represent conditions that pose an <br />unacceptable risk to human health or the environment. <br />Site Setting <br />The WPCP is located at 3000 Davis Street, San Leandro, Alameda County, California. The former <br />polishing pond basin is located at the western end of the WPCP and is bordered on the south and east <br />by a tidal slough with a connection to San Francisco Bay (the Bay), and on the north by the Oakland <br />International Airport and the Metropolitan Golf Links course. The 194-acre Oyster Bay Regional <br />Shoreline Area is located immediately south of the tidal slough. The storage basin resembles an active