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City of Redwood City Page 29 Sewer System Management Plan, March 2018 Element IV Table IV-1 : Historical Regular Line Cleaning Results Calendar Year Line Cleaning Results, linear feet Line Cleaning Results, miles Percent of System 2016 601,920 114 62.0 Table IV-2 : High Frequency Lines Frequency Number of Pipe Segments Line Cleaning, Linear Feet Annual Cleaning, Linear Feet Percent of System Weekly 9 1,391 72,332 0.13% Monthly 37 9,601 115,212 0.93% Bi-monthly 10 2,283 13,698 0.22% Total, Linear Feet 56 13,275 201,242 1.29% Total, Miles 2.51 38.11 IV-4 Sewer Main Preventive Maintenance – Equipment The major equipment utilized for sewer system maintenance include: • A combination vacuum/jetter truck; it is the City’s primary tool for cleaning gravity sewers. The City traps roots, grease, silt, and debris dislodged during hydro-jetting in a downstream manhole and uses the vacuum to extract this material from the sewer system. • A truck-mounted rodder is used to remove obstructions from inside sewer lines, and is primarily assigned to clean areas with known root problems. • A repair utility truck carries equipment designed for sewer line emergencies as well as regular maintenance. One of the primary pieces of equipment on the truck is a generator powered electric-driven line cleaner for 4- to 6-inch sewer lines. The truck is also equipped with a portable sea snake closed-circuit television (CCTV) unit. The combination truck is the City’s primary sewer cleaning tool. The rodder is primarily used to clear sections of mainline of heavy grease or root intrusion. Its use may be triggered by: (1) cleaning reports identifying areas of concern, (2) CCTV inspection results originating from the Engineering Division of the Community Development Department, or (3) heavily tree-lined streets. 6.2.A. - Page 37