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<br /> <br />City of Redwood City Page 5 <br />Sewer System Management Plan, March 2018 Introduction <br />Intro Table 2 : Sewer System Materials of Construction <br />Material <br />Number of Line <br />Segments <br />Pipe Length, <br />LF <br />Percent of <br />Sewer System <br />Asbestos Cement, ACP 12 2,553 0.26% <br />Cast Iron 10 1,379 0.14% <br />Corrugated Steel 6 1,076 0.11% <br />Ductile Iron 4 409 0.04% <br />High-Density <br />Polyethylene 32 4,948 0.51% <br />Polyvinyl Chloride 698 107,595 11.09% <br />Reinforced Concrete 36 8,028 0.83% <br />Vitrified Clay 4497 843,762 86.97% <br />Unknown 5 450 0.05% <br />Total 5,300 970,200 100% <br />Total, Miles 183.75 <br />Source: City GIS Files <br /> <br />Intro Table 3 : Inventory of Sewer Lines by Pipe Age <br />Age in <br />Years <br />Construction <br />Period <br />Percent of <br />System <br />Linear Feet of <br />Main Sewer <br />0 – 17 2000 – current 5.00% 48,510 <br />18 – 37 1980 – 1999 21.00% 203,742 <br />38 – 57 1960 – 1979 14.00% 135,828 <br />58 – 77 1940 – 1959 19.00% 184,338 <br />78 – 97 1920 – 1939 0.00% 0 <br />98 – 117 1900 – 1919 0.00% 0 <br />>117 Before 1900 0.00% 0 <br />Unknown Unknown 41.00% 397,782 <br />Total, Linear Feet 970,200 <br />Total, Miles 183.75 <br />Source: CIWQS Operational Performance Report 10/20/2017 <br /> <br /> <br />6.2.A. - Page 13