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Impact 4.D-1 Development facilitated by the proposed Zone would affect levels of service at the local study intersections under Existing plus Project conditions (for vehicle queue spillback impeding through traffic on Stoneridge Drive and blocking access to driveways along Johnson Drive during PM peak hours). 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 Existing 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- I a, 4.D-1 b, 4.D-1 c, and 4.D- l d 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. 2. Implementation of Measures 4.D -la, 4.D -lb, 4.D -lc, and 4.D-ld set forth in Table 6-1 of the Final SEIR and listed in the MMRP will reduce the severity of Impact 4.D-1; 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 -1d is not certain at this time, the measure is not legally feasible, though the measure is physically feasible. Mitigation Measures 4.D- l a, 4.D -lb, 4.D- l c, and 4.D- l d 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 below. Mitigation Measure 4.D -la: Commerce Drive at Johnson Drive Intersection. Prior to the granting of a certificate of occupancy for the first use in Phase I that would generate 100 or more PM or Saturday peak -hour trips, the City shall install or require the developer in Phase I to install a traffic signal and construct a southbound left -turn lane to Commerce Drive at the Commerce Drive and Johnson Drive intersection. A funding mechanism for this improvement shall be approved by the City prior to the issuance of the first building permit for a Phase I use that would generate 100 or more PM peak - 47