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W A T E R I E N E R G Y I l I E E RIVERSIDE PUBLIC UTILITIES Board Memorandum P U B L I C U T T I I T T F $ BOARD OF PUBLIC UTILITIES DATE: July 16, 2010 ITEM NO: 19 SUBJECT: CONSTRUCTION OF THE TWELFTH STREET WATER DISTRIBUTION MAIN REPLACEMENT PROJECT— PHASE II, WORK ORDER NO. 1013088 ISSUE: Consideration of the capital expenditure in the amount of$1,294,000 to construct the Twelfth Street Water Distribution Main Replacement Project—Phase II as part of the ongoing Small Main Replacement Program. RECOMMENDATION: That the Board of Public Utilities approve the capital expenditure in the amount of$1,294,000 for Work Order No. 1013088, which includes design and construction costs for the Twelfth Street Water Distribution Main Replacement Project— Phase 11. BACKGROUND: The work will be constructed by the City field forces and 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 do not meet modern fire flow requirements. The work will generally entail the construction of approximately 5,630 linear feet of eight-inch and 12-inch ductile iron pipe, twenty- two regular fire hydrants, one hundred eight domestic water services, as well as all other related fittings and appurtenances. The project area includes Eleventh Street from Redwood Drive to Cedar Street, Twelfth Street from Redwood Drive to Brockton Ave, Pine Street from Thirteenth Street to Eleventh Street, Locust Street from Thirteenth Street to Tenth Street and Tenth Street from Brockton Street to Locust Street, more specifically described on the attached project site map. 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. On February 5, 2010, the Board approved the expenditure of$120,000 for the design and construction of 336 linear feet of 12-inch water main in this same area. This was due to Public Works Department lowering of the intersection of Locust Street and Tenth Street. Since the lowering of the intersection was on a fast track schedule by the Public Works Department,the construction work at the intersection was set as Phase 1. Staff will also have the Purchasing Service Manager advertise for the permanent asphalt concrete (ac) paving through the formal bid process. Once bids are opened, staff will come to the Board at a later date to award the paving portion of the Twelfth Street Water Distribution Main Replacement Project— Phase 11.