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which could partially mitigate the significant <br />traffic and circulation effects, are infeasible. <br />a.8 Fact. See Section XII infeasibility of <br />alternatives). <br />B. Significant Effect. Increase in traffic on Tri-Valley <br />intercity arterials, freeways and highways due to <br />cumulative regional development. Unacceptable <br />congestion would result on Tri-Valley freeways given a <br />buildout of Scenario 1 or 2 under presently announced <br />freeway plans. <br />b.l Finding. Mitigation measures which would lessen <br />the effect of traffic on Tri-Valley freeways are <br />subject to the jurisdiction of other public <br />agencies and can and should be adopted by such <br />agencies. <br />b.2 Fact. Cities in the Tri-Valley area other than <br />Pleasanton can create a regional network of <br />intercity arterials to supplement the existing <br />freeway/highway network by improvement/extension of <br />existing intercity arterials by connecting to and <br />extending Pleasanton's major thoroughfares. <br />b.3 Fact. MTC, BART, Alameda County and Contra Costa <br />County can develop regional transit systems such as <br />the Dublin-Livermore-Pleasanton joint powers <br />agency, BART extension, and light rail transit <br />system. <br />b.4 Fact. Caltrans can construct freeway, highway and <br />auxiliary lane improvement projects which are <br />included in the NPID and the 1985 Caltrans STIP, <br />including widening and improvement of the <br />I-580/Hopyard interchange, I-580/Santa Rita Road <br />interchange, I-580/Hacienda interchange and <br />I-680/Stoneridge interchange (and I-680/West Las <br />Positas interchange if needed). <br />b.5 Fact. Caltrans has jurisdiction over and can <br />construct the improvements to I-580 between Dublin <br />Canyon and Altamont Pass which are currently being <br />studied, including E1 Charro Road interchange, and <br />others listed in Section C of the EIR <br />(Transportation and Circulation). <br />b.6 Fact. Caltrans and FHWA have jurisdiction over and <br />can study further and implement improvement of the <br />I-580/I-680 interchange. <br />b.7 Fact. Caltrans can implement improvements on State <br />Route 84 as described in Section C of the EIR <br />(Transportation and Circulation). <br />- 15 - <br />