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(Draft SEIR, pp. 4.J-26 to 4.J-27.) Impact 4.J-7 Development facilitated by the General Plan Amendment and rezonings could potentially be exposed to aircraft noise associated with the closest airport which would exceed the applicable noise exposure criteria. The SEIR evaluates the impact of the proposed project related to the exposure of residents to aircraft noise associated with the Livermore Municipal Airport, which would exceed the applicable noise exposure criteria. 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-7 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. Aircraft/airport noise exposure associated with Livermore Municipal Airport is expected to be well below 60 dB Ldn at the closest potential site for rezoning (Site 14). Additionally, interior aircraft-related noise exposure is not expected to exceed the applicable 45 dB Ldn criterion. However, maximum noise levels from aircraft departures to the west may exceed the applicable 50/55 dB Lmax criteria within habitable rooms. 2. Implementation of Mitigation Measure 4.J-7 set forth in Table 6-1 of the Final SEIR and listed in the MMRP will ensure that Impact 4.J-7 would be reduced to a less than significant level and is hereby incorporated by reference and described below. 4.J-7: For residential developments at Sites 11 and 14 near the left-hand pattern of Runway 25L, the City shall require a site-specific acoustical assessments to determine noise exposure, impact, and mitigation regarding aircraft single events. The assessments shall include the collection of aircraft single-event noise level data for no less than 48-hours on or in the vicinity of the given housing areas. If needed, aircraft-related single-event noise exposure shall be mitigated to satisfy the applicable City of Pleasanton Code criteria of 50 dB Lmax (bedrooms) and 55 dB Lmax (other habitable rooms) using acoustically rated construction materials/systems. Site(s) affected: Sites 11, 14 (Draft SEIR, p. 4.J-28.)