09-17-10 BPU RPT 07 - Laserfiche WebLink

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RIVERSIDE PUBLIC UTILITIES Board Memorandum P U H t I I U T I L I T I E S BOARD OF PUBLIC UTILITIES DATE: September 17, 2010 ITEM NO: 7 SUBJECT: CONSTRUCTION OF THE VINE STREET WATER MAIN REPLACEMENT PROJECT ISSUE: That the Board of Public Utilities considerthe capital expenditure in the amount of$304,540 to construct the Vine Street Water Main Replacement Project. RECOMMENDATION: That the Board of Public Utilities approve the capital expenditure of$344,500 for Work Order No. 1024631, which includes all design and construction costs for the Vine Street Water Main Replacement Project. BACKGROUND: In conjunction with the Caltrans/Riverside County Transportation Commission(RCTC) HOV project on the 91 Freeway, Riverside Public Utilities(RPU)[Electric Division will be relocating overhead power lines which would require the installation of additional poles along Vine Street between Fourteenth and Fifteenth Streets. The existing 6-inch water pipeline in Vine Street within this area is in conflict with the proposed location of these additional poles. Because the existing 6-inch water pipeline is an old, lengthy dead-end main with no redundancy, this work provides an opportunity to add looping which will significantly improve fire flow and system reliability in this area along Vine Street. The work identified will be constructed by the Water Division's field forces. The work will generally entail the construction of approximately 1,260 linear feet of eight-inch ductile iron pipe, five fire hydrants and eight domestic water services, as well as all other related fittings and appurtenances on Vine Street and other surrounding streets, more specifically shown on the attached project site map. The work will also involve boring and jacking an approximately thirty foot segment of 8-inch ductile iron pipe within a 14-inch diameter steel casing beneath the Riverside Canal in Prospect Avenue. Once the new water pipelines are installed, RPU will be responsible for trench repaving. The trench repaving will be performed according to the Publics Works paving standards and Riverside Municipal Code Chapter 13.12. However,the exact scope of the paving work will be specifically defined after the pipeline construction has begun and the actual trench limits are established in the field,working in concert with the Public Works Department. A budgetary estimate for the paving work has been included in this authorization. The actual amount will be reported at a future date after bids for the paving work have been received with a recommendation to award the project. 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.