Reso25 16341 - Laserfiche WebLink

Browse Search

GOAL AND INTRODUCTION © 2025 Fischer Compliance, LLC. All rights reserved. Sewer System Management Plan licensed for Redwood City use only Page 7 of 59 1.3. Sewer System Asset Overview WDR REQUIREMENTS Att. D-1.3 (pg. D-3) “The Plan Introduction section must provide a description of the Enrollee-owned assets and service area, including but not limited to: • Location, including county(ies); • Service area boundary; • Population and community served; • System size, including total length in miles, length of gravity mainlines, length of pressurized (force) mains, and number of pump stations and siphons; • Structures diverting stormwater to the sewer system; • Data management systems; • Sewer system ownership and operation responsibilities between Enrollee and private entities for upper and lower sewer laterals; • Estimated number or percentage of residential, commercial, and industrial service connections; and • Unique service boundary conditions and challenge(s). Additionally, the Plan Introduction section must provide reference to the Enrollee’s up-to-date map of its sanitary sewer system, as required in section 4.1 (Updated Map of Sanitary Sewer System) of this Attachment.” COMPLIANCE The City operates a sanitary sewer system that serves a population of approximately 85,512 people in a 19.42 square mile service area in San Mateo County. The City has three distinct collection system areas. The main part of the City, located southwest of Highway 101, includes the City’s downtown as well as residential areas. Seaport/Pacific Shores and Redwood Shores, the other two areas, are both located on the east side of Highway 101, near the San Francisco Bay. The sewer system serves 15,607 single family and 1,458 multiple family residential service locations and 1,387 commercial service locations from 18,452 lateral connections. The sewer system consists of 181.3 miles of gravity sewers and 11.5 miles of force mains. The system includes 4,613 manholes and 31 lift stations. The City also manages 26 siphons system totaling 0.23 miles for which lengths have been determined. There are no structures which divert stormwater to the sewer. The majority (81%) of the sewer system pipes are either 6 inches or 8 inches in diameter, while the siphons range from 6 inches to 10 inches in diameter. The pipes are mainly constructed of vitrified clay (75%) or polyvinyl chloride (21%), with 2% high-density polyethylene and less than 1% each of asbestos cement, cast iron, corrugated steel, ductile iron, and reinforced concrete pipe. With respect to age of the pipes, 16% were constructed between 1940-1959, 13% were constructed between 1960-1979, 24% were constructed between 1980-1999, 16% were constructed between 2000-2019, less than 1% were constructed between 2020-current, and 30% of pipes have an unknown age. The City uses Hiperweb for scheduling and documenting inspection and maintenance activities and for utility infrastructure mapping. This software provides City staff with the ability to access attribute data for sewer and stormwater pipelines using a mobile device. The City uses ArcGIS to manage its assets, including asset inventories and mapping. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 14 of 317