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. .. - - Engineer Lee presented the staff report and gave a summary of events including Council '-- approvals of this project beginning in 1990. He elaborated on the original budget items and figures and described the preliminary gross estimate of the project which was not based on comprehensive design data. Engineer Lee showed artists renderings of the original design which reflected the Council's desire to have more than just a bridge. The Council wanted a true civic structure which made this design unique on the peninsula. Mayor Hartnett explained that the Council was considering this project at this time because of the increase in the budget estimates, changes in some of the features, and the need for a Council decision with respect to the features and budget. Mayor Hartnett added that the timing was such that the Council could not delay very much in making these decisions because the Transit Authority needed to be approached for additional funds. B. Review potential changes and cost savings - David LaVelle, Brian Kangas Foulk Engineer Lee showed overheads and mentioned the deletion of the Wilson Street detour. David LaVelle, BKF, said the project was primarily the same but the difference in costs related to needed technical changes. He said the proposed retaining walls and shoring systems needed to be increased, groundwater was found at 8 feet rather than the 12 feet level as expected, and the lateral pressures in the area, the soil stability, was not as good as expected. Those situations would greatly increase the footing sizes and retaining walls. '--- He explained that this construction situation was the major change in the budget. The Joint Powers Board decided to do upgrading work at Sequoia Station after the City design had been completed, and the tracks were widened which required wider retaining walls. In January, 1994 ADA went into effect and changed the longitudinal slopes on sidewalks which increased the amount of retaining wall required. Also, there have been inflationary construction costs. Mr. LaVelle said when the project was funded through the Transportation Authority it did not include the Wilson Street detour. Mr. LaVelle described the detour and said staff was recommending the elimination of this part of the project to save $600,000. The new detour proposed would include Maple to Broadway. Mr. LaVelle said that pile driving the area under the bridge only, would cut costs by reducing the size of the foundation. He explained why tiebacks would not work in that area. In answer to Council questions, Mr. LaVelle said that the deletion of the Wilson Street detour would close off Jefferson, but the signalization at Maple and El Camino Real would remain to encourage Jefferson traffic to use Maple. He said 60% of Jefferson traffic would go to Maple, 25-30% would use Broadway, and the remaining 10 to 15 percent would find adjacent streets. The detour situation would last 12-14 months and there would be traffic impacts. The budget does include traffic improvements along Maple. L-- MINUTE BOOK NO. 54 Page No. 139 Special Council Meeting Minutes March 18, 1996 Page 2