Description

Lift Station No. 21’s force main has been in operation since 1982. A force main condition assessment was conducted in June 2022 that included a records analysis, televising of the force main, and a physical inspection to determine estimated remaining useful life of each force main. This assessment identified sections of force mains that were at high risk of failure and ranked them based on priority. From this priority list, Lift Station No. 21’s force main was identified as being in ‘extremely poor condition’, having lost 70% of its original thickness, and posing a high risk of structural collapse. Due to its age, significant wall loss/deteriorated condition, and high risk of structural collapse, renewal of this 2,600 ft of 6-in ductile iron pipe force main is necessary to prevent potential collection system failure. An initial study of various rehabilitation and replacement methods will occur to find the best value option for renewal.