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4. Construct a second on-ramp lane to northbound I-680 from the westbound Stoneridge Drive approach. The two lane on-ramp should be merged to one lane prior to the freeway merge area. The lane drop will occur over a distance of at least 800 feet, and will require reconstruction and widening of the bridge at this on-ramp from one to two lanes, with the merge occurring after the bridge. (Note: This improvement is within Caltrans right-of-way and requires Caltrans design review and oversight.) A funding mechanism for these improvements 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 or Saturday peak -hour trips. Site(s) affected: All sites within the proposed Zone (Phase I and Full Buildout). (Draft SEIR, pp. 4.D-20 to 4.D-38.) Impact 4.D-2 Development facilitated by the proposed Zone would affect levels of service at the local study intersections under Near-term 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, and for 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 Near-term 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 -lc, and 4.D-ld 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- 1 a, 4.D-1 b, 4.D-1 c, and 4.D- l d set forth in Table 6-1 of the Final SEIR and listed in the MMRP will reduce the 49