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WATER 1 ENERGY I LIFE PUBLIC UTILITIES RIVERSIDE PUBLIC UTILITIES Board Memorandum BOARD OF PUBLIC UTILITIES DATE: SEPTEMBER 11, 2023 SUBJECT: CONSTRUCTION OF THE GLENCOE DRIVE AND MONTICELLO AVENUE WATER MAIN REPLACEMENT PROJECT (PHASE I) — WORK ORDER NO. 1805878 IN THE AMOUNT OF $1,700,000 ISSUE: Consider approval of Work Order No. 1805878 in the total amount of $1,700,000 for all engineering, construction, paving and construction contingency costs for the Glencoe Drive and Monticello Avenue Water Main Replacement Project (Phase I). RECOMMENDATION: That the Board of Public Utilities approve Work Order No. 1805878 in the total amount of $1,700,000 for all engineering, construction, paving and construction contingency costs for the Glencoe Drive and Monticello Avenue Water Main Replacement Project (Phase I). BACKGROUND: Water Division staff budgets and schedules the replacement of water distribution pipelines annually based on several factors via a Business Risk Exposure (BRE) model that considers pipeline age, material, maintenance records, and the criticality of each pipeline segment of the water distribution system. The BRE model has proven valuable in identifying and prioritizing water main replacement projects. Water staff presented the use and functionality of the BRE to the Board of Public Utilities Water Committee on October 13, 2021. This project is part of an ongoing water main replacement program to replace old and high-priority water mains. The project area consists of 6 -inch cast iron and 8 -inch ductile iron water pipelines installed between 1957 and 1998. These pipelines have experienced over 20 reported leaks, of which 11 have occurred since 2005. These water pipelines rank high for replacement based on leak history, age, material, and size. Replacing these pipelines ensures continued water system reliability. The unusually high number of leaks and premature failure of some of the pipelines in this area is suspected to have been accelerated by soil conditions in the vicinity of this project that are considered corrosive to ferrous material. By installing pipelines made of Molecularly Oriented Polyvinyl Chloride (PVCO) material, we expect the newly installed water pipelines will achieve a longer service life since PVCO is not known to be adversely affected by the soil conditions in this area.