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<br /> <br /> <br />Because of the expansive reaction ofCenterville soils during freeze-thaw cycles, <br />the upper sections ofmanh6les are subject to considerable stresses which result in <br />the deterioration of manhole rings and grout seals.' Manhole chimney seals have <br />been incorporated into new construction along with better road bed construction. <br /> <br />The life cycle items most likely to fail on the Centerville system are lift stations. <br />To date, these problems have been cost-effective to repair. The City upgraded lift <br />station controls at the CSAH 14 lift station in the year 2000. . <br /> <br />c. SANITARY SYSTEM MAINTENANCE <br /> <br />There are several maintenance and repair problems as well as facilities upgrade <br />issues which need to be addressed by the City. There are other maintenance <br />issues which need outside subcontractor services. Maintenance service schedules <br />are shown in the following: <br /> <br />Action <br /> <br />Schedule <br /> <br />Sewer flushing and cleaning <br />Sewer televising <br /> <br />5 -10 yeats <br />20 years <br /> <br />The City's Public Works Department maintains a map showing flushing zones <br />and schedules. To better coordinate system maintenance, it is recomttieri.ded that <br />the City develop a computerized record management system for public works <br />projects. <br /> <br />When the City becomes fully developed, it would be appropriate to fund the <br />system maintenance operations annually to avoid large initial expenses. <br /> <br />5 <br />