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severity of Impact 4.D-2; as discussed in the SEIR, even with implementation of these mitigation measures, this impact would not be reduced to a less -than - significant level because the improvement described in part 4 of Mitigation Measure 4.D-ld is within Caltrans right-of-way and requires substantial Caltrans design review and oversight, and is not under the control of the City. Therefore, because the timing of Mitigation Measure 4.D-1 d is not certain at this time, the measure is not legally feasible, though the measure is physically feasible. Mitigation Measures 4.D -la, 4.D -lb, 4.D -lc, and 4.D-ld are interdependent (i.e., all of these measures must be implemented to reduce the impact to Stoneridge Drive [queue spillback] to less than significant). These mitigation measures are hereby incorporated by reference and described above under Impact 4.D-1. (Draft SEIR, pp. 4.D-38 to 4.D-44.) Impact 4.D-3 Development facilitated by the proposed Zone would affect levels of service at the local study intersections under Far -term (Cumulative) plus Project conditions (vehicle queue spillback impeding through traffic on Stoneridge Drive and blocking access to driveways along Johnson Drive during PM peak hours; and the Johnson Drive and Park and Ride Lot Intersection). The SEIR evaluates the impact of the proposed Zone related to the potential to add traffic to local study intersections to the point at which they would operate unacceptably under Far -term (Cumulative) plus Project conditions. Significance Before Mitigation: Significant Significance After Mitigation: Significant and Unavoidable Finding: Changes have been incorporated into the proposed Zone that would substantially lessen this impact, however, the changes would not reduce this impact to a less -than -significant level. Mitigation Measures 4.D -la, 4.D -lb, 4.D -1c, and 4.D -Id are incorporated into the proposed Zone. Facts in Support of Finding: The following facts and mitigation measures indicate that the impact will not be reduced to less than significant. 1. Implementation of the proposed Zone would result in vehicle queue spillback that would impede through traffic on Stoneridge Drive and block access to driveways along Johnson Drive during PM peak hours, and for the Johnson Drive and Park and Ride Lot Intersection. 2. Implementation of Mitigation Measures 4.D -1a, 4.D -lb, 4.D -lc, and 4.D-ld set 50