This project in San Leandro, California was conducted to support compliance with the 2022 San Francisco Bay Regional Water Quality Control Board (RWQCB) Amendment to Waste Discharge Requirements for Long-Term Flood Protection Considerations at Closed and Operating Municipal Solid Waste Bayfront Landfills.

Scope of Services

Terraphase completed a comprehensive background review of all available information for this project, including site-specific climate hazard data developed by the City of San Leandro, relevant regulatory guidance, and historical landfill documentation. Using available Light Detection and Ranging (LiDAR) and survey data, we assessed current site topography and conducted a detailed analysis of projected sea-level rise (SLR), groundwater elevation rise, and surface water inundation scenarios for 2050 and 2100. Our assessment followed guidance from the California Ocean Protection Council (OPC) and Bay Conservation and Development Commission (BCDC) Adapting to Rising Tides framework. Data sources included flood and groundwater mapping from the San Francisco Estuary Institute and the U.S. Geologic Survey (USGS) Coastal Storm Modeling System. The study culminated in the development of a phased flood adaptation plan with recommended strategies to enhance site resilience over time.

Notable Accomplishments

• Conducted site-specific flood and groundwater rise analysis for 2050 and 2100 SLR scenarios
• Prepared a site vulnerability assessment and phased adaptation strategy
• Proposed conceptual adaptation measures including berms, groundwater controls, irrigation strategies, and nature-based solutions