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2020 Eugene Wastewater Master Plan Chapter 3: Existing Wastewater Systems 12 <br />Table 3-1: Wastewater Inventory by Year Constructed – Gravity System <br />Year Constructed Percent of System Length of Pipe (feet) <br />1912-1919 1% 437,680 <br />1920-1929 2% 90,960 <br />1930-1939 1% 23,800 <br />1940-1949 4% 141,330 <br />1950-1959 9% 336,790 <br />1960-1969 25% 925,180 <br />1970-1979 17% 617,240 <br />1980-1989 9% 337,190 <br />1990-1999 23% 850,290 <br />2000-2009 7% 273,090 <br />2010-2019 2% 77,400 <br />Total 3,716,940 <br /> <br />Table 3-2: Wastewater Inventory by Year Constructed – Pressure System <br />Year Constructed Percent of System Length of Pipe (feet) <br />1950-1959 0.4% 266 <br />1960-1969 19% 11,120 <br />1970-1979 2% 1,126 <br />1980-1989 35% 21,257 <br />1990-1999 34% 20,444 <br />2000-2009 9% 5,293 <br />2010-2019 0% 22 <br />Total 59,665 <br />The estimated replacement value of the gravity collection system, including 25% for engineering, based <br />on 2019 construction costs, is $855 million, as shown in Table 3-3.