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forth in Table 6-1 of the Final SEIR and listed in the MMRP will reduce the severity of Impact 4.D-3; 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-ld 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-44 to 4.D-50.) Impact 4.D-5 Development facilitated by the proposed Zone would affect levels of service for freeway ramps at merge/diverge areas within I-680 under Existing plus Project conditions. The SEIR evaluates the impact of the proposed Zone related to levels of service for freeway ramps at merge/diverge areas within I-680. 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 Measure 4.D-2 is incorporated into the proposed Zone. Facts in Support of Finding: The following facts and mitigation measure indicate that the impact will not be reduced to less than significant. 1. The addition of traffic that would be generated by the Zone under Phase I and full buildout would further degrade operations of already deficient freeway segments and would either result in or worsen LOS F conditions at the I-680 northbound and southbound ramp merge/diverge areas at Stoneridge Drive. 2. Implementation of Mitigation Measure 4.D-2 set forth in Table 6-1 of the Final SEIR and listed in the MMRP will reduce the severity of Impact 4.D-5; as discussed in the SEIR, even with implementation of this mitigation measure, this impact would not be reduced to a less -than -significant level because the improvement described in Mitigation Measure 4.D-2 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-2 is not certain at this time, the measure is not legally feasible, though the measure is physically feasible. This mitigation measure is hereby incorporated by reference and described below. 51