02-19-10 BPU RPT 11 - Laserfiche WebLink

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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: February 19, 2010 ITEM NO: 11 SUBJECT: CONSTRUCTION OF THE MERRILL AVENUE 8-INCH WATER DISTRIBUTION MAIN REPLACEMENT PROJECT ISSUE: Consideration of the capital expenditure in the amount of$1,116,000 to construct the Merrill Avenue 8-Inch Water Distribution Main Replacement Project. RECOMMENDATION: That the Board of Public Utilities approve the capital expenditure of$1,116,000 for Work Order No. 1013090, which includes all design and construction costs for the Merrill Avenue 8-Inch Water Distribution Main Replacement Project. BACKGROUND: The construction of the Merrill Avenue 8-Inch Water Distribution Main Replacement Project is part of the on- going water main replacement program. The work will generally entail the construction of approximately 4,000 linear feet of eight-inch ductile iron pipe, 11 fire hydrants, and reconnect to 121 existing water services within Merrill Avenue and Beatty Drive as shown on the attached project site map.The work identified will be constructed by the Water Division's field forces. Once the new water pipelines are installed, Riverside Public Utilities (RPU)will be responsible for standard trench repaving per the Public Works (PW) standard. RPU will solicit bids for trench repaving through its contractors panel to ensure paving begins immediately upon completion of the pipeline construction. Alternatively, if Public Works crews are available to execute the work, RPU will use their crews. 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, Peak Hour, and fire flow 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. FISCAL IMPACT: The total capital expenditure for Work Order No. 1013090 is estimated to be $1,116,000 which includes all design and construction costs necessary to perform the work, as summarized in the following table: