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Impact 4.J-9 Development facilitated by the General Plan Amendment and rezonings in combination with other foreseen projects in the city could potentially produce a significant cumulative increase in traffic noise exposure under the project scenario. The SEIR evaluates the impact of the proposed project related to the exposure of residents to traffic noise resulting from additional traffic on local area roadways in combination with other foreseen projects in the city. Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant Finding: Changes or alterations have been required in or incorporated into the Project that would avoid or substantially lessen the significant environmental effect as identified in the SEIR. Mitigation Measure 4.J-9 which is required in or incorporated into the Project, will reduce the significant environmental impact to a less than significant level. Facts in Support of Finding: The following facts and mitigation measures indicate that the impact will be reduced to less than significant. 1. Cumulative traffic noise level increases would be significant along Busch Road north of Valley Avenue and Valley Avenue south of Bernal Avenue. Potentially significant, cumulatively considerable, project-related traffic noise level increase of 1 dB is established along Stoneridge Drive between Johnson Drive and Hopyard Road, and Hopyard Road between Stoneridge Drive and West Las Positas Boulevard. In these cases, the project-related increases, although not in excess of the established City of Pleasanton General Plan significance threshold (5+ dB), may increase traffic noise exposure to above the City's 60 dB Ldn limit within neighboring single-family residential backyards. 2. Implementation of Mitigation Measure 4.J-9 set forth in Table 6-1 of the Final SEIR and listed in the MMRP will ensure that Impact 4.J-9 would be reduced to a less than significant level and is hereby incorporated by reference and described below. 4.J-9: Prior to PUD approval, if a potential site for rezoning would add traffic noise in excess of 55 dBA as described in Table 4.J-7, the project applicant shall conduct an off-site noise study to determine the project's contribution to off-site roadway noise and contribute its fair-share to mitigate the established noise impact. Site(s) affected: All (Draft SEIR, pp. 4.J-29 to 4.J-34.)