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74 <br />SEWER RATE STUDY I City of Santa Ana, CA <br />Pipe Vintage <br />The oldest pipes in the system appear to have been installed as early as 1900. Over 12 percent were <br />installed prior to 1930. The majority of the system (about 70 percent) was installed in the 1950s through <br />the 1970s. Pipe vintages (install decade) are listed in Table B 1 below. Figure B 7 also shows the amount <br />of pipe installed each year as well as the cumulative totals. Figure B 8 provides a map of sewer mains <br />color coded by pipe install decade. <br />Table B - 1: Pipe Vintages by Install Decade <br />Pre 1930 <br />938 <br />10.77% <br />298,228 <br />56.48 <br />12.66% <br />1930s <br />68 <br />0.78% <br />20,902 <br />3.96 <br />0.89% <br />1940s <br />318 <br />3.65% <br />94,930 <br />17.98 <br />4.03% <br />19505 <br />2,264 <br />26.01% <br />617,026 <br />116.86 <br />26.18% <br />1960s <br />2,682 <br />30.81% <br />673,698 <br />127.59 <br />28.59% <br />1970s <br />1,431 <br />16.44% <br />404,027 <br />76.52 <br />17.15% <br />19805 <br />323 <br />3.71% <br />88,064 <br />16.68 <br />3.74% <br />19905 <br />231 <br />2.65% <br />59,956 <br />11.36 <br />2.54% <br />2000s <br />155 <br />1.78% <br />38,054 <br />7.21 <br />1.61% <br />2010s <br />57 <br />0.65% <br />5,944 <br />1.13 <br />0.25% <br />Unknown <br />239 <br />2.75% <br />55,689 <br />10.55 <br />2.36% <br />Total <br />8,706 <br />100.00% <br />2,356,518 <br />446.31 <br />100.00% <br />Figure B- 7: Annual and Cumulative Miles of Installed Pipe by Year <br />65B -233 <br />NOVEMBER 2014 <br />500 <br />25 <br />Cum Miles <br />—Miles <br />I 450 <br />400 <br />20 <br />a <br />350 <br />N <br />—` 300 <br />15 e <br />f 250 <br />d <br />A 200 <br />10 <br />C <br />j 9 <br />150 <br />U <br />100 <br />5 <br />50 <br />I 0 <br />0 <br />N N N trt M V V V V vt vt tp tp 1p n <br />n n n N M p] � T p\ <br />O O O O <br />III <br />Y <br />C <br />I <br />Install Year <br />I.. <br />65B -233 <br />NOVEMBER 2014 <br />