Agmt25 Peninsula Corridor Joint Powers Board - PSR MOU

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Mott MacDonald | RWC GSP and 4-Track Hub Station Planning WDPR 11680 Page 3 of 13 Street to vehicular traffic and the 4-track hub station for the City of Redwood City. This will include evaluating whether Alternative 1A is a feasible alternative to move forward financially, any refinements needed to the presented in the Project Study Report, and if there are other alternatives/refinements to Alternative 1A that might be more practical from a project cost and project delivery perspective. Our team will review the previous studies and deliverables of the grade separation projects in Redwood City. This includes the design plans developed for the preferred alternative (Alternative 1A), the associated infrastructure required, and impacts it has on the existing facilities and related stakeholders. Determination of reasonable work windows and construction durations, minimizing the number of construction stages and temporary works required, and maximizing the effectiveness of each construction stage will be the goal of the conceptual engineering team for this task. Development of a cut-over strategy for the railroad which involves a planned transition process where an existing rail line is gradually replaced with a new one, minimizing disruption to the service by strategically phasing out the old track while simultaneously activating new sections (utilizing temporary tracks or bypasses to maintain operations during the transition period). This would include traction power/overhead catenary system (OCS), train control, signaling, trackwork, and other railway infrastructure. A blended design criteria to include California High Speed Rail (CHSR) will be used for the trackway design, as has been done for the San Jose Diridon Station Area Plan. Any additional impacts by use of this criteria beyond those identified in the PSR will be documented. The criteria will be shared with Caltrain and the City of Redwood City staff along with the trackway calculations. Since the structural components of the project are an important consideration for this analysis, a review of structural types/systems that lend itself better to staged construction and/or ease of installation will be undertaken and discussed with Caltrain and the City for selection moving forward. The conceptual design team will develop a high-level construction and phasing plan to explore side-by-side construction phasing for the elevated tracks in consultation with Caltrain operations and engineering staff. Side by side construction phasing would allow for two elevated tracks to be built adjacent to the current tracks followed by building two additional elevated tracks to complete the four-track segment. We will also review and incorporate constraints from the electrified service, train control and other systems into the phasing recommendations developed by our team. The critical areas for consideration will be the tie-in locations and identifying opportunities to create construction space, taking into account limitations posed by existing developments on either side of the current tracks. T The team will also conduct a high-level assessment of potential construction phasing impacts on city streets and traffic operations adjacent to the Redwood City Caltrain station and the five grade separations along the Caltrain corridor. The analysis will focus on identifying which streets would be potentially impacted and the duration of this impact. us with a high level of understanding of the services being supported in the ATTY/AGR.2025.069/Caltrain (MOU with Caltrain- Grade Separation Project) (Page 13 of 18)