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W A T E R I E N E R 5 Y , L I F E RIVERSIDE PUBLIC UTILITIES Board Memorandum P U B L I C U T I L I T I E S BOARD OF PUBLIC UTILITIES DATE: March 19, 2010 ITEM NO: 8 SUBJECT: CONSTRUCTION OF THE CALIFORNIA AVENUE/BEL AIR STREETS-INCH WATER MAIN REPLACEMENT PROJECT ISSUE: Consideration of the capital expenditure in the amount of$1,332,000 to construct the California Avenue/Bel Air Street 8-inch Water Main Replacement Project. RECOMMENDATION: That the Board of Public Utilities approve the capital expenditure of$1,332,000 for Work Order No. 0814447, which includes all design and construction costs for the California Avenue/Bel Air Street 8-inch Water Main Replacement Project. BACKGROUND: The work identified will be constructed by the Water Division's field forces. This project is part of the Riverside Public Utilities Department's(RPU)ongoing water main replacement program to replace aging and undersized water mains and improve fire protection. In particular, the four-inch and six-inch pipelines that are to be replaced as part of this project have been identified as undersized, and they have a history of leaks. The work will generally entail the construction of approximately 4,900 linear feet of eight-inch ductile iron pipe, 150 linear feet of six-inch ductile iron pipe,twelve fire hydrants and one-hundred twenty domestic water services, as well as all other related fittings and appurtenances on California Avenue, Bel Air Street and other surrounding streets, more specifically described on the attached project site map. Once the new water pipelines are installed, RPU will be responsible for standard trench repaving per the Public Works (PW) standard. Staff will solicit bids for this work through local contractors. The City Public Works Department will also be invited to provide a "bid" for this work. In the event the Public Works Department can perform this work at a lower cost, their estimated costs will be reimbursed. A budgetary estimate for the paving work has been included in this authorization. Basis of Design The project adheres to RPU's adopted design criteria for network pipelines, which specifies a maximum design velocity of six feet per second at peak hour demands (Ref. 2005 Water Master Plan, Table 7-1). A 24-hour simulation was performed using H2O Map software and the Hydraulic Model produced with the 2005 Water Master Plan. Average Day, Maximum Day and Peak Hour demands for existing and future scenarios were simulated and run through the network in order to arrive at the appropriate pipeline diameters for the project. The water pipelines for this project were engineered for ductile iron pipe, as this is RPU's standard design practice for potable water distribution pipelines sized 12-inches in diameter or smaller.