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The SEIR evaluates the impact of the proposed project related to the exposure of residents to excessive exterior and interior noise resulting from train noise events. 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-3 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. Train-related noise exposure at Sites 8, 11, 14, 18, and 21, which are in close proximity to the UPRR mainline tracks, may exceed the applicable 70 dB Ldn exterior noise exposure limit and 50 dB Lmax/55 dB Lmax criteria within habitable rooms. As a result, this impact would be potentially significant. 2. Implementation of Mitigation Measure 4.J-3 set forth in Table 6-1 of the Final SEIR and listed in the MMRP will ensure that Impact 4.J-3 would be reduced to a less than significant level and is hereby incorporated by reference and described below. 4.J-3: The City shall require project applicants (Sites 8, 11, 14, 18, and 21) to conduct site-specific acoustical assessments to determine train-related noise exposure, impact, and mitigation. Recommendations in the acoustical assessment shall be sufficient to satisfy the applicable City of Pleasanton 70 dB Ldn and 50/55 dB Lmax exterior and interior noise exposure criteria, respectively, using appropriate housing site design and building construction improvements. Site(s) affected: Sites 8, 11, 14, 18, 21 (Draft SEIR, pp. 4419 to 4.J-20.) Impact 4.J-5 Development facilitated by the General Plan Amendment and rezonings could potentially generate additional traffic on local area roadways and associated increases in traffic noise exposure relative to existing conditions. The SEIR evaluates the impact of the proposed project related 1 0 the exposure of residents to traffic noise resulting from additional traffic on local area roadways. Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant