2006 Water Comprehensive Plan - City of Bellevue

In 1999 Montgomery Watson completed a detailed structural analysis of the next 7 reservoirson the priority listing. Based on those results, Bellevue has constructed seismic improvementsat the Lake Hills (both north and south tanks), Woodridge and Parksite reservoirs, and theSomerset 1 reservoir is in the process of being abandoned. This analysis identified the need forseismic improvements at each of the remaining two reservoir sites covered in the study, withsimilar improvements anticipated at three additional sites with reservoirs similar to thosecovered in the study.The Utility has budgeted approximately $3 million (2006 dollars) of its capital improvementbudget over the next 7 years (2007-2013) for this work and expects the program to continuebeyond the current CIP window. Specific project scopes, expenditures and schedules will bedeveloped and adjusted as the results of each reservoir’s specific improvement needs aredetermined.PUMP STATION EVALUATION AND REHABILITATIONThe City of Bellevue is initiating a capital improvement program to rehabilitate all of its pumpstations and mitigate earthquake damage to the pump station structures and their contents inorder to maintain their function following seismic events. Kennedy/Jenks Consultants iscurrently performing structural analysis and condition assessment of all 23 of the City’s waterpump stations. The study will identify needed improvements and prioritize them based on adetermination of business risk which will include a determination of consequence of failure andseismic vulnerability of each pump station.The City has set aside approximately $5.7 million (2006 dollars) of its capital improvementbudget over the next 7 years (2007-2013) for this work. Specific project scopes, expendituresand schedules will be developed and adjusted as the results of each pump station’s specificimprovement needs are determined.PRV REHABILITATIONBellevue currently has approximately 160 pressure reducing valves (PRVs) located in watermains throughout the water service area. These PRVs provide an important means of supplyingwater to its 62 distinct pressure zones.Bellevue has a program in place to rehabilitate or replace old, deteriorating and unsafe watersystem vaults containing these pressure reducing valves (PRVs) and upgrade or replace thevalves themselves. Program funding is currently sufficient to rehabilitate or replaceapproximately 4 PRVs each year, with average budget of approximately $270,000 per year(2006 dollars) over the next 7 years (2007-2013). As of the end of 2005, this program hasrehabilitated or replaced 22 PRVsThe program was established in 1991 to address increasing maintenance and reliability concernsat these facilities, many of which are over 25 years old and contain galvanized pipe, valves, and7-8