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+. i •+ 7 NGr i 1 RIVERSIDE PUBLIC UTILITIES Board Memorandum P U 8 t I C U T I L I T I € S BOARD OF PUBLIC UTILITIES DATE: August 20, 2010 ITEM NO: 7 SUBJECT: CONSTRUCTION OF THE SAN BERNARDINO WATER SUPPLY LINE WASHINGTON STREET 48-INCH WATER TRANSMISSION MAIN REPLACEMENT PROJECT— BID NO. 6868, WORK ORDER NO. 1017774 ISSUE: That the Board of Public Utilities consider approval of the capital expenditure in the amount of$4,000,000 to construct the San Bernardino Water Supply Line Washington Street 48-inch Water Transmission Main Replacement Project, Bid No.. 6868. RECOMMENDATIONS: That the Board of Public Utilities: 1. Approve the capital expenditure of $4,000,000 for Work Order No. 1017774, which includes all design, construction, change order contingencies, construction management and inspection for the San Bernardino Water Supply Line Washington Street 48-inch Water Transmission Main Replacement Project, Bid No. 6868; 2. Award a contract forthe construction of the San Bernardino Water Supply Line Washington Street48- inch Water Transmission Main Replacement Project, Bid No.6868,to the lowest responsive bidder, L.H. Woods & Sons, Inc., of Vista, California, in the amount of$3,240,444; 3. Authorize the issuance of change orders to the purchase order of up to ten percent(10)of the original amount for Bid No. 6868. Such changes will be reported to the Board of Public Utilities at the conclusion of the project; and 4. Approve the expenditure of $404,659 for Work Order Nos. 1023047, 1020426, 1024586 and 1025485, as a result of emergency leak repairs to the 42-inch water supply line. BACKGROUND: The San Bernardino Water Supply Line conveys water to the City of Riverside produced from the wells within the City of San Bernardino and the recently completed John W. North Water Treatment Plant. Sections of the transmission system dates back to the original installation in the mid 1920's and have reached the end of their useful life. These sections pose a high risk of failure due to their age. One such section is in the southem part of the City of Colton between Mt.Vemon Avenue and the Treatment Plant (Exhibit 1). This section in question has had three major and six residual failures within the past six months. Repairs to the sections of the reinforced concrete pipe were undertaken on emergency authorization by the Public Utilities General Manager and the City Manager. Several horizontal spring line cracks and mortar ring joint failures were repaired. Due to the age and fragility of the lightly reinforced concrete pipe, ground movement associated with repair work can induce additional cracking at the joints. Reliability of the water system to the City of Riverside becomes compromised with each failure. Staff provided an overview of the issue to the Board at its regular meeting on May 7, 2010.