65B - PROPOSED WATER AND SEWER RATE ADJ

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City of Santa Ana, CA 1 WATER RATE STUDY Figure - 2: Distribution of Breaks by Pipe Material and Install Decade AC = Asbestos Concrete CYL = Pre - stressed Concrete STL— Steel Cl = Cast Iron DI = Ductile Iron UNK= Unknown CMLC = Cement Mortar -Lined & Coated Steel PVC = Poly Vinyl Chloride Developing an R &R Program based on the results of Figures 3 and 4 would indicate that at a minimum, the City should be prioritizing replacement work for all lines installed in the 1950s through the 1960s, which represents almost 44 percent of the miles of mains in the system. Black & Veatch also examined the age of the pipe at the time of a detected break. Figure 3 summarizes our findings of this analysis using data from 1990 forward. The City did not track this information prior to 1990. As Figure 3 illustrates, the majority of breaks occur in two groupings: between 34 and 39 years old and between 42 and 46 years of age. These periods correspond to installations dates between 1975 to 1980 and 1968 to 1972, respectively. BLACK & VEATCH 1 Water Rate Study [INTENTIONALLY LEFT BLANK] 65B -37 ?5