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City of Santa Ana, CA I WATER RATE STUDY <br />Figure ES - 1: Distribution of Pipe Materials by Install Decade <br />700 <br />a <br />v <br />LL <br />`0 600 <br />a <br />c <br />500 <br />0 <br />0 <br />400 <br />1930Pre 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s LINK <br />MAC MCI MCMLC ECYL MIDI MPVC WSTL PUNK <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 />A natural next step in evaluating the condition of assets is to examine break history. The City has only <br />maintained records on break history since the 1990s in the Geographic Information System (GIS). <br />Records from 1990 to 2012 show that the City averages 45 to 50 breaks per year. Black & Veatch <br />examined the number of breaks per mile per decade of pipe installation and by material in order to gain <br />a better understanding of the trends in break history. Figure ES 2 shows that almost 68 percent of the <br />breaks have occurred in Cast Iron pipe, 19 percent in Asbestos Cement (AC) and 7 percent in Ductile Iron <br />(DI). Additionally, 58 percent of the breaks have occurred in pipe installed in the 1950 -60s; however, the <br />City only installed 43 percent of all pipes during these two decades. <br />BLACK & VEATCH I Executwe iuni mary <br />65B -15 <br />3 <br />rr <br />1 1 171 r= <br />�r <br />1930Pre 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s LINK <br />MAC MCI MCMLC ECYL MIDI MPVC WSTL PUNK <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 />A natural next step in evaluating the condition of assets is to examine break history. The City has only <br />maintained records on break history since the 1990s in the Geographic Information System (GIS). <br />Records from 1990 to 2012 show that the City averages 45 to 50 breaks per year. Black & Veatch <br />examined the number of breaks per mile per decade of pipe installation and by material in order to gain <br />a better understanding of the trends in break history. Figure ES 2 shows that almost 68 percent of the <br />breaks have occurred in Cast Iron pipe, 19 percent in Asbestos Cement (AC) and 7 percent in Ductile Iron <br />(DI). Additionally, 58 percent of the breaks have occurred in pipe installed in the 1950 -60s; however, the <br />City only installed 43 percent of all pipes during these two decades. <br />BLACK & VEATCH I Executwe iuni mary <br />65B -15 <br />3 <br />