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PATTERSON STREET UNDERPASS - ESTIMATE OF PROBABLE CONSTRUCTION COSTS <br />• Construction of a new section of Patterson Street between Broadway and 8th Avenue, <br />including a traffic signal at the Patterson Street/Broadway intersection. <br />Timing of the availability of the EWEB site for construction of the Patterson Underpass is <br />uncertain at this time. However, it is unlikely that the EWEB site would be available in time <br />for the Patterson Underpass to be constructed concurrently with the Courthouse project. <br />Because of the changes in the Courthouse project described above, it may be beneficial to <br />stage some of the Courthouse project. <br />The design of the Courthouse project is currently between the preliminary and final design <br />phases. Since the it was not known how much of the Courthouse project could be built <br />initially, the preliminary design was performed so as to be able to accommodate multiple <br />phasing or construction of the entire project at once. If staging is found to be appropriate, a <br />possible construction staging scenario could be one in which the Courthouse roadway <br />improvements are constructed under the first phase to provide access to the Courthouse. <br />The second phase would construct the remainder of the Courthouse roadway <br />improvements concurrently with the Patterson Underpass. The construction that would be <br />included in each of these phases could be as follows: <br />Phase 1 <br />• 8th Avenue east of Mill Street to Ferry Street <br />_. <br />• Ferry Street between 8th Avenue and proposed Hwy. 99W <br />', ' • Reconstruction and realignment of Ferry Street between Broadway and 8th Avenue <br />• Proposed Hwy. 99W between Ferry Street and 6th Avenue <br />', Phase 2 <br />• Construction of the Patterson Underpass, which includes 8th Avenue east of Ferry Street <br />and new Patterson Street between Broadway and 8th Avenue with the addition of a <br />-' traffic signal at the Broadway/Patterson intersection <br />• Proposed realigned Hwy. 99W between Broadway and Ferry Street. <br />`~ ' • Improvements to Broadway <br />• Improvements to Mill Street between Broadway and the viaduct/ 6th Avenue with the <br />addition of traffic signal at the Mill Street/ 8th Avenue intersection <br />'• PDX/PATTERSON STREET UNDERPASS TECH MEMO 062504 PAGE 6 OF 6 <br />