08-14-2017 BPU RPT 08 - Laserfiche WebLink

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W A I R h N h B L Y I. l F F RIVERSIDE PUBLIC UTILITIES Board Memorandum PUBLIC UTILITIES BOARD OF PUBLIC UTILITIES DATE: AUGUST 14, 2017 ITEM NO: 8 SUBJECT: CONSTRUCTION OF THE TENTH AND ELEVENTH STREET WATER MAIN REPLACEMENT PROJECT — APPROVE THE INCREASED EXPENDITURE OF $500,000 FOR WORK ORDER NO. 1619730 FOR A REVISED WORK ORDER TOTAL OF $2,245,000 ISSUE: Approve the increased expenditure of $500,000 for Work Order No. 1619730 for a revised total of $2,245,000 which includes all design, construction, paving and construction contingency costs for the Tenth and Eleventh Street Water Main Replacement Project. RECOMMENDATION: That the Board of Public Utilities approve the increased expenditure of $500,000 for Work Order No. 1619730 for a revised total of $2,245,000 which includes all design, construction, paving and construction contingency costs for the Tenth and Eleventh Street Water Main Replacement Project. BACKGROUND: The Board of Public Utilities approved the construction of the Tenth and Eleventh Street Water Main Replacement Project on August 22, 2016. The project entails replacing existing 6 -inch and 10 -inch cast iron and steel water mains installed between 1924 and 1938. Based on their leak history, age and size, these water pipelines are high priorities for replacement to enhance system reliability and increase fire flow. Riverside Public Utilities (RPU) Water Division's field forces are completing the work. The work east of Market Street took place during nighttime hours to minimize disruptions to businesses in the Downtown area. Final paving of the pipeline trenches remains. Staff is in the process of hiring a contractor from RPU's Paving Panel to complete the paving work, and paving will begin in early August. DISCUSSION: Construction costs exceeded the original estimate due to several factors, including conflicts with several unknown underground utilities and other obstructions in this historic part of the City. RPU field forces had slower than anticipated progress during nighttime working hours from carefully hand digging around the conflicts and modifying the pipeline alignment at various locations, requiring additional labor and extra pipe fittings.