The Kellogg Resiliency Project, led by the Fairfield-Suisun Sewer District in partnership with Suisun City (the landowner), is a community co-design, multi-benefit initiative aimed at addressing vulnerabilities related to sea-level rise (SLR), flooding, and fire risk. Located adjacent to Suisun Slough, the project site includes existing stormwater infrastructure and is identified as one of the first areas in Suisun City likely to flood under future SLR scenarios. Without improvements, the site poses a risk to surrounding properties, stormwater management systems, and wastewater infrastructure critical to Fairfield-Suisun Sewer District’s operations.

Scope of Services

Terraphase supported the project by identifying, compiling, and evaluating existing information to characterize site physical, operational, and permitting constraints, as well as potential opportunities. Based on this assessment, Terraphase developed a series of project alternatives and fact sheets to present to the community to address initial project goals, such as SLR flood protection using nature-based solutions, fire hazard reduction, habitat creation, and potential recreational and educational elements. Community input was central to the process, with feedback gathered through outreach efforts and a design charrette informing the refinement of project alternatives. A 30% civil engineering design package and planning-level cost estimate will be prepared for the preferred alternative to support regulatory permitting and finalization of the design in the next phase of the project.

Notable Accomplishments

• Developed multiple nature-based retrofit alternatives and community-facing fact sheets
• Successfully facilitated community engagement through a design charrette and outreach materials
• Supported planning for a 30% design and cost estimate to guide final project development