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� � Background � Basic source data was collected to develop the information and recommendations presented in this study. The data collected consisted of the following: � � 1) An evaluation of all Ciry streets to produce a numerical pavement condition index (PCn which rates the existing condition of the pavement based on a visual surface inspection. A � PCI =1 means the pavement has completely deteriorated; while a PCI =10 means it is brand new. � 2) An inventory of the year built, length, curb type and last maintenance performed. 3) Discussions with Public Works about storm sewer deficiencies, water main needs and sanitary sewer repairs. � This data was studied and professional judgment (from both an engineering perspective and ' rehabilitation perspective) was applied to develop the opinions and recommendations presented . � herein. � . Introduction � � i Street Life Cycle � The City of Centerville is similaz to other communities with local streets approaching the end of their useful life. The City must consider budgeting for more expensive programs to maintain its streets, � other than routine seal coats. Figure No. 1 identifies the life cycle of a typical street and the required maintenance based. on its condition. � Asphalt pavements perform well, deteriorating slowly through the first 10 years of the streets life, i and then tend to fail rapidly. In the early years of a street's life, crack repair/seal coat is the recommended maintenance. As the pavement condition begins to deteriorate further and streets :� become older, seal coat applicadons are no Ionger recommended as the most cost effective maintenance. A street's condition will deteriorate 40°90 during the first 75°Xo of its life, while the next !; � 40% of deciine takes place in only 129�0 of a streets life. This cridcal juncture typically occurs 15 to 20 years after a street is built, as shown on Figure No. 1. ;� Centerville Pavement Management Study 8