07-20-12 BPU RPT 09 - Laserfiche WebLink

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W A T E R E N E R G Y F RIVERSIDE PUBLIC UTILITIES Board Memorandum PUBLIC UTILITIES BOARD OF PUBLIC UTILITIES DATE: July 20, 2012 ITEM NO: 9 SUBJECT: CONSTRUCTION OF THE TENTH, TWELFTH AND CRIDGE STREETS BRIDGE WATERMAIN CROSSINGS PROJECT,UTILITY AGREEMENT NOS.21701,21700 AND 21218, AS PART OF THE STATE ROUTE 91 HOV LANE WIDENING PROJECT, BID NO.7047,WORKORDER NOS. 1112058, 1112057 AND 1112054;REIMBURSEMENT BY RCTC—AUTHORIZATION TO INCREASE CHANGE ORDER AUTHORITY ISSUES: That the Board of Public Utilities consider approval of: 1)an increase in change order authority in the amount of$300,000, for a total change order authority of$956,008; and 2) an additional capital expenditure in the amount of$388,000 for Work Order No. 1112057,for a total Work Order amount of$2,300,000,to complete construction of the Tenth, Twelfth and Cridge Streets Bridge Watermain Crossings Project, Bid No. 7047. RECOMMENDATIONS: That the Board of Public Utilities: 1. Authorize staff to issue change orders in an additional amount of $300,000 to the construction contract with Trautwein Construction, Inc (Bid No. 7047), with such changes reported to the Board at the conclusion of the project; and 2. Increase Work Order No. 1112057 by the amount of$388,000, for a total Work Order amount of $2,300,000. BACKGROUND: The State Route 91 HOV Lane Widening Project is currently under construction,with the State of California Department of Transportation (Caltrans) acting as the Construction Administrator and Riverside County Transportation Commission (RCTC) providing funding for the utility relocations. On February 17, 2012,the Riverside Board of Public Utilities awarded a contract to Trautwein Construction, Inc.,for the construction of three watermain relocations at Tenth,Twelfth and Cridge Streets Bridge crossings (Utility Agreement Nos. 21701, 21700 and 21218, respectively). The watermain relocations at each of these three bridges are currently under construction,with the Tenth and Cridge Street crossings nearing completion. However, the contractor has recently experienced significant unforeseen conditions at the Twelfth Street Bridge location. During tunneling of the 54-inch diameter steel casing, at about 35 feet below the street surface,the surrounding loose soil collapsed around the contractors Tunnel Boring Machine(TBM),This unforeseen soil condition has caused the TBM to become immobile and non-operational. Given the depth of the TBM and a very constrained project site,there is no easy and straightforward solution for rescuing the TBM and completing final placement of the steel casing. Nevertheless, staff has negotiated with the contractor to arrive at the most expedient and cost effective approach to safely remove the TBM and complete the project.