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Recommended Capacity Improvement Plan City of Redwood City (0011239.02)3-18 Woodard & Curran, Inc. Sanitary Sewer Capacity Master Plan November 2023 3.4.1 Potential I/I Reduction Based on the results of the capacity and I/I analyses, an evaluation was conducted to identify the potential for eliminating (or substantially reducing) needed capacity relief projects through reduction in RDI/I flows. Specific flow meter areas located upstream of capacity relief projects were identified, focusing on reasonably small upstream basins. The hydraulic model was used to evaluate the capacity impact of a modest 30 percent RDI/I reduction in selected flow meter areas. Although the amounts of RDI/I reduction may vary widely from area to area, 30 percent reduction is a generally accepted value in the industry considered to be reasonably achievable through comprehensive rehabilitation of sewer mainlines and lower laterals in these areas. Table 3-5 lists the projects that could potentially be eliminated or reduced in size based on achieving 30 percent RDI/I reduction in targeted upstream flow meter areas. This information is provided to suggest areas of potential focus for future I/I reduction activities. However, this Master Plan focuses on capacity improvement projects rather than I/I reduction because of the greater uncertainties, potentially higher costs, and institutional challenges associated with implementing comprehensive sewer rehabilitation projects to reduce I/I. Table 3-5:Potential Elimination of Capacity Relief Projects through RDI/I Reduction ` Project ID Location Flow Meter Areas Targeted for 30% RDI/I Reduction Comments C7 Winslow St. (Standish St. to Brewster Ave.), Brewster Ave (Winslow St. to west of Veterans Blvd.) FM02 Reduces pipe sizes C8 Whipple Ave. (Woodstock Pl. to Arguello St.)FM02 Project no longer needed C9 Brewster Ave. (Hudson St. to Arch St.)FM05 Upstream portion (62% of project length) no longer needed C11 Jefferson Ave. (Myrtle St. to Iris St.)FM07 Upstream portion (67% of project length) no longer needed C14 Roosevelt Ave. (Valota Rd. to Hudson St.)FM13 Project no longer needed C18 Truman St., McGarvy Ave., Fairview Ave., Roosevelt Ave. (southeast of McGarvy Ave. to Roosevelt Ave.) FM13 Project no longer needed C19 Carson St. (Dewey St. to southeast of Roosevelt Ave.)FM13 Project no longer needed C22 Jefferson Ave. (Ruby St. to Quartz St.)FM07 Project no longer needed ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 153 of 317