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City of Redwood City Page 1 Sewer System Management Plan, March 2018 Introduction INTRODUCTION Sewer System Management Plan This Sewer System Management Plan (SSMP) has been prepared by the Public Works Services Department of the City of Redwood City with the assistance of Causey Consulting, Walnut Creek, CA. It is a compendium of the policies, procedures, and activities that are included in the planning, management, operation, and maintenance of the City’s sanitary sewer system. It provides revisions since the July 2016 revised SSMP by RMC Water and Environment. The State Water Resources Control Board (SWRCB) has issued statewide waste discharge requirements for sanitary sewer systems, which include requirements for development of a SSMP. The State Water Resources Control Board requirements are outlined in Order No. 2006-0003-DWQ, Statewide General Waste Discharge Requirements for Sanitary Sewer Systems, dated May 2, 2006 (GWDR), and Order No. WQ-2008-0002-EXEC, dated February 20, 2008, which was amended by Order No. 2013-0058-EXEC amending the Monitoring and Reporting Program (MRP) elements of the WDR, effective September 9, 2013. This SSMP is intended to update the City’s 2016 SSMP, in conformance with the GWDR and MRP revised requirements. The structure (section numbering and nomenclature) of this SSMP follows the above referenced GWDR Section D.13. This SSMP is organized by the SWRCB outline of elements; and contains language taken from the GWDR at that beginning of each element. The GWDR uses the term “Enrollee” to mean each individual municipal wastewater collection system that has completed and submitted the required application for coverage under the WDR (in this case, the Enrollee is the City of Redwood City). The City’s waste discharger identification number (WDID) in the California Integrated Water Quality System (CIWQS) is 2SSO10168. Sanitary Sewer System Facilities The City operates a sanitary sewer system that serves a population of approximately 84,950 in a 19.42 square mile service area. The sewer system serves 19,600 single family and 7,400 multiple family residential sewage units and 1,140 commercial, 16 industrial and 101 institutional sewage units1 from 18,017 lateral connections. The sewer system consists of 183.75 miles of gravity sewers (approximately 5,300 line segments), 4,772 manholes, 10.27 miles of force mains, and 31 lift stations. The sewers range in size from four (4) inches to sixty (60) inches in diameter and the piping system includes twenty-five (26) siphons. The property owner is responsible for installation, maintenance and repair of the parcel upper private sewer lateral(s). The City is responsible for the lower lateral from the property line to the City main line estimated at approximately 109 miles. The City estimates that approximately 6.9% of the system is located in easements and backyards totaling 12.5 miles of the total sewer system. The City also manages 26 siphons in the collection system totaling 0.23 miles for which lengths have been determined. Intro Figure 1 contains a map of the City’s sanitary sewer system service area along with areas satellite to the City system. The City has entered into several agreements with satellite agencies that allow sewage from those agencies to flow through the Redwood City collection system to the SVCW treatment facilities. These agencies include: 1 Water and Sewer Financials Plans and Rate Studies, Final Draft April 29, 2016, Bartle Wells Associates 6.2.A. - Page 9