CITY COUNCIL MEETING AGENDA PACKET

Page 2 of 4 The studies evaluated both the system capacity (ability to convey sewage flows) and the condition of the infrastructure (most, but not all assets), which are used to convey sewage. Generally speaking, with just a few exceptions, the system capacity (size of piping and pump stations) is robust and is able to convey current and future predicted sewage flows. Some up- sizing of piping is needed to support future development. The assessment of the condition of assets is more complicated. While systems remain operationally reliable, they are beginning to degrade with age and are nearing the end of their useful life. A recent unexpected severe sewer line collapse at Danker Rd where approximately 300 feet of sewer pipes failed is one of several conditions that show signs of aged infrastructure and the need for capital improvement and replacement. Over the next 20 years, replacement and rehabilitation projects will be needed to renew piping and pumping systems to extend the useful life of the conveyance systems and maintain reliability. More studies are needed of the piping systems, including significant closed-caption television (CCTV) analysis, to develop a complete picture of asset conditions. DISCUSSION The purpose of the City’s long-term Sewer CIP is to ensure the sustainability of the City’s sewer system infrastructure and determine funding needs. The long-term CIP is a living plan that is reviewed on a two-year cycle to evaluate implementation progress and updated on a six-year cycle to reflect any changes in drivers and needs. Development of the long-term CIP is based on technical evaluations that include condition assessments and system capacity assessments. The long-term CIP includes prioritized projects with cost estimates over a 20- year span. The long-term Sewer CIP consists of a list of recommended projects that fall within the major categories listed below: • Capacity & Reliability Improvement Projects • Lift Station Projects • Condition Assessment Projects. Each recommended project was prioritized based on the following system: • Priority Level A – The highest priority projects in need of immediate repair/replacement because of imminent failure, or safety hazard. Includes critical infrastructure that could result in a sewage spill if left unaddressed, or that does not meet the City’s current hydraulic design criteria. This priority level also includes inspection of critical assets missing condition data, so the extent of any future rehabilitation or replacement needs can be determined. • Priority Level B – The midterm priority projects, defined as projects in need of near-term repair/replacement because of deteriorating/poor condition. This priority level also includes assumptions about asset replacement/rehabilitation identified as part of the inspection performed in priority level A. • Priority Level C – The lowest priority projects. These include work anticipated based on assumed asset conditions, but the scope and schedules of these projects are not defined. This priority level also includes the re-inspection and condition assessment of Page 205 of 323