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24 <br />�VRYEH R.", I c S7U7`I City of Santa Ana, CA <br />Figure -1: Distribution of Pipe Materials by Install Decade <br />d <br />d <br />0 600 <br />a <br />c <br />� 500 <br />O <br />400 <br />v i <br />a I <br />m 300 <br />N <br />c <br />L 200 <br />1 1 , , , , <br />0 <br />1930Pre 1930s <br />1940s <br />1950s <br />1960s <br />1970s 1980s 1990s 2000s 2010s LINK <br />MAC <br />MCI <br />MCMLC <br />MICYL <br />MIDI MPVC MISTL MUNK <br />AC= Asbestos Concrete CYL = Pre-stressed Concrete STL — Steel <br />Cl = Cast Iron DI = Ductile Iron LINK = Unknown <br />CMLC= Cement Mortar -Lined & Coated Steel PVC= Poly Vinyl Chloride <br />Replacing assets based on a depreciation life does not address site - specific conditions that may lead to <br />increased break frequencies. Breaks may occur due to a number of reasons including age, soil <br />conditions, corrosive environments, and lack of maintenance. Figure 2 illustrates the number of breaks <br />by material and decade installed for the City's system. <br />[INTENTIONALLY LEFT BLANK] <br />65B -36 <br />NOVEMBER 2014 <br />