08 - Laserfiche WebLink

of the Operations Services Department's Utilities Division over a two-week period, the pipeline was located. Between the bridge, and location identified to install the isolation valve (isolation valves are necessary to shut the water pipeline down so that flexible couplings could be installed at the bridge), the existing pipeline was found 15 feet further west than expected, and four feet deeper than expected, at a very unusual for water pipeline depth of ten feet below the pavement surface. The located pipe was also asbestos cement pipe and not ductile iron as expected, which when cutting to install an isolation valve required the protocols associated with the handling of hazardous materials to be followed. As the pipe was further west than anticipated. the actual location of the pipe required additional traffic control. Since the pipe depth was greater than anticipated, it required engineered trench shoring and utilization of a shoring box. The multiple excavations performed when searching for the pipeline significantly damaged the roadway, causing the need to backfill with slurry mix and additional pavement repairs. As if the problem of locating the buried pipeline was not enough, the existing pipeline going through the bridge abutment, and hanging from the bridge as it crosses the arroyo, was observed to have sagged several inches over time and exceeded the manufacture's recommended allowable joint deflection. Since this could lead to failure of the pipeline at the arroyo crossing, staff authorized the contractor to remove the sags and move the pipeline back to the correct grade. Since all the water pipeline work is in the street, with much of it below the approach slabs, and all of it critical to finishing the project and opening the street and bridge up to traffic, staff authorized all the pipeline work to be completed on a time and material basis, anticipating a change order being written at completion. The City inspectors observed the work and documented the time and materials associate with the additional work. While a full analysis of the documentation is not yet complete, it is estimated the contractor is due a contract change order for approximately $50,000 for this additional work. 4. Additional Paving (PCO #13 - #15) There are two components to the paving work that required change orders: 1. Santa Rita Road on either side of the bridge was to be reconstructed as part of the Annual Resurfacing Project. As originally scheduled and planned, the work associated with the Santa Rita Road bridge would have been completed before the street paving project. Due to the additional construction phase and the water pipeline work discussed previously, the schedule was extended to the point that paving could not occur. The paving contractor was directed to delete the installation of approximately 170 tons of pavement from the annual paving project as they were no longer paving adjacent to the Santa Rita Road bridge. This created a deductive change order with the paving contractor. To complete the paving as planned and after the bridge work is complete, it will require a change order under the bridge repair contract for approximately $47,500. This also includes cost associated with temporarily relocating bridge traffic control devices during paving. Page 6 of 7