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<br />1-1 <br />1 Executive Summary <br />The Dumbarton Transportation Corridor Study (DTCS) is a feasibility study that evaluates <br />potential multimodal transportation improvements within the Dumbarton Corridor in the South <br />San Francisco Bay Area that can improve mobility between southern Alameda County (East Bay) <br />and San Mateo County / northern Santa Clara County (the Peninsula). DTCS was led by the San <br />Mateo County Transit District (SamTrans), which purchased the Dumbarton Rail Bridge and <br />right-of-way (ROW) between Redwood Junction and Newark Junction in 1994, anticipating <br />eventual reinstatement of rail service in the Corridor. In addition to studying potential transit <br />services on the Rail Bridge, the DTCS examined improvements to the Dumbarton Highway Bridge <br />and its approaches. SamTrans worked collaboratively with project partners including Facebook, <br />the San Mateo County Transportation Authority (TA), Alameda County Transportation <br />Commission (Alameda CTC), and the Alameda-Contra Costa Transit District (AC Transit) over the <br />course of the study. SamTrans also conducted stakeholder and public outreach at two major <br />study milestones, with a third round of outreach planned in August 2017, to gather input from <br />affected communities. <br />The DTCS study area includes cities in San Mateo, Santa Clara and Alameda counties that <br />immediately surround and include the Dumbarton Highway and Rail Bridges. Tier 1 cities are <br />directly affected by transportation facilities on this Corridor while Tier 2 cities are indirectly <br />affected by congestion along the Dumbarton Corridor. Table 1-1 lists the study area cities and <br />Figure 1-1 shows the DTCS study area. <br />Table 1-1: Dumbarton Transportation Corridor Study Area Cities <br />Peninsula Tier 1 Cities East Bay Tier 1 Cities <br />x Redwood City <br />x Menlo Park <br />x East Palo Alto <br />x Palo Alto <br />x Stanford (Census-Designated Place) <br />x Atherton <br />x Union City <br />x Newark <br />x Fremont <br />Peninsula Tier 2 Cities East Bay Tier 2 Cities <br />x Mountain View <br />x Sunnyvale <br />x Santa Clara <br />x San Ramon <br />x Dublin <br />x Pleasanton <br />x Livermore <br /> <br />The Corridor has been the subject of feasibility studies since the early 1990s, all part of an <br />attempt to address the growing demand for travel between the East Bay and Peninsula and lack <br />of a high-capacity transit option across the southern portion of the Bay. Traffic congestion and the <br />jobs-housing imbalance between the two sides of the Bay has grown and are projected to worsen <br />if the Corridor isn’t improved to move more people, especially during the peak commute travel <br />periods. <br />6.1.D. - Page 10