08-01-2014 BPU RPT 04 - Laserfiche WebLink

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ISSUE: The item for Board of Public Utilities consideration is approval of a change order in the amount of 50 , to the an Bernardino Transmission Pipeline Appurtenance Replacement project. That the Board of Public Utilities approve a change order to the construction agreement with Trautwein Construction, Inc. in the arnount of $100,000 due to unforeseen contingencies encountered during construction of the San Bernardino Transmission Pipeline Appurtenance Replacennent project. in 20,1; the Board. of Public Utilities authorized staff to perform a C-ondition assessment on the San Bernardino Transmission Main. This assessment indicated that a 220 foot long segment of concreete pipe constructed along Waterman Avenue behveen Hospitality Lane and Vanderbilt Way needed to be replaced. On January 17, 2014, the Board approved a project to replace this pipe with 42-inch cement- morl'ar-lined and coated steel pipe and approved a capital expenditure of $876,000 for Work Order No. 1320071, which included work by field forces to shutdown, isolate and de-water the transmission main. Included as part of that approval was the award of a construction or to Trautwein Constniction, Inc., in the amount of $657,776 During construction of the pipeline, several unforseen challenges v.,ere encountered. First, the location of one of the system connections was not accurate and required extra potholing to locate, as well as additional piping to complete. Second, there was substantially rnore concrete "M be removed than originally anticipated. These factors were exacerbated by the depth of the pipeline (15 to 20 feet deep) and inaccuracy of the "As-Built,"' plans from the 1920's and 1960's. As a result of these challenges and their associated delays, the connection work was pushed into the warmer season. Because of the configuration of the piping, only 'two of the three connections were needed for the Waterman System to operate at partial capacity. The plan was to make two connections with the Waterman System down and then perform the third connection behind a closed valve with the system in law flow operation. However, it was discovered that the necessary isolating valve was broken and Riverside Public Lltilifi es'(RPU) Field Forces had to complete an emergency valve replacement. As work on the third connection was made, it was discovered that there was an unknown connection frorn the pressurized pipeline to the isolated segment and this required another shutdown of the Waterman System to complete the tie-in work- The additional work completed by the contractor restulted in the projject Work Order exceeding the Board authorized arriount. The additional work done by contractor was approximately $100,000.