08-03-12 BPU RPT 06 - Laserfiche WebLink

Home

W A ; E R E N E R G Y RIVERSIDE PUBLIC UTILITIES s Board Memorandum PUBLIC UTILITIES BOARD OF PUBLIC UTILITIES DATE: August 3, 2012 ITEM NO: 6 SUBJECT: CONSTRUCTION OF THE SAN BERNARDINO 48-INCH WATER SUPPLY MAIN REPLACEMENT PROJECT, TRANSIT AVE SEGMENT — PHASE II, BID NO. 7088, WORK ORDER NO. 1020879 ISSUE: That the Board of Public Utilities consider approval of a capital expenditure in the amount of $1,932,600 to construct the San Bernardino 48-inch Water Supply Main Replacement Project, Transit Ave Segment — Phase II, Bid No. 7088. RECOMMENDATIONS: That the Board of Public Utilities: 1. Approve the capital expenditure for Work Order No. 1020879 in the amount of $1,932,600 which includes all design, construction, change order contingencies, construction management and inspection for the San Bernardino Water Supply Main Replacement Project, Transit Ave Segment— Phase II, Bid No. 7088; 2. Award a contract for the construction of the San Bernardino Water Supply Main Replacement Project, Transit Ave Segment — Phase II, Bid No. 7088, to the lowest responsive bidder, Trautwein Construction, Inc., of Riverside, California, in the amount of $1,349,370; and 3. Authorize the issuance of change orders to the purchase order of up to fifteen percent (15%) of the original amount of the agreement with Trautwein Construction, Inc., with such changes to be reported to the Board of Public Utilities at the conclusion of the project. BACKGROUND: In 2007, staff prepared a technical report titled "JW North Treatment Plant and Related Projects". In the report, certain sections of the existing 42-inch water supply line that conveys water from the John W. North Water Treatment Plant (JNWTP) to the Linden/Evans Reservoir Complex were identified to be replaced. These critical sections of reinforced concrete pipe (RCP) were originally installed in 1926 and are approaching the end of their useful service life. The past 86 years of growth within the City has caused rising water demands, resulting in an increased flow of water through the existing sections of 42-inch RCP. This additional flow creates a significantly higher hydraulic headloss and produces an increase in pressure within the pipe walls. These contributing factors decrease the reliability of this major water supply line. Therefore, in order to meet the present day and future water demands of the City, the existing 42-inch RCP will be replaced with a new 48-inch concrete mortar lined and coated (CML&C) steel pipeline.