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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 Measures 4.J-5a through 4.J-5c which are 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. Potentially significant, project-related traffic noise level increase of 1 dB is established along Hopyard Road between West Las Positas Boulevard and Valley Avenue and Stoneridge Drive between West Las Positas Boulevard and Santa Rita Road, which may increase traffic noise exposure to above 60 dB Ldn within single-family residential backyards. Development adjacent to several roadways may experience traffic noise exposure in excess of 65 dB, potentially resulting in interior noise exposure of 45 dB Ldn or higher within some project buildings. 2. Implementation of Mitigation Measures 4.J-5a through 4.J- 5c set forth in Table 6-1 of the Final SEIR and listed in the MMRP will ensure that Impact 4.J-5 would be reduced to a less than significant level and are hereby incorporated by reference and described below. 4.J-5a: 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-6, 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. 4.J-5b: Any residential or office buildings shall be built to California's interior- noise insulation standard so that interior traffic noise exposure does not exceed 45 dB Ldn. Before building permits are issued, the project applicant shall be required to submit an acoustical analysis demonstrating that the buildings have been designed to limit interior traffic noise exposure to a level of 45 dB Ldn/CNEL or less. 4.J-5c: Any locations of outdoor activity for sensitive uses associated with the project site shall be designed so that the noise exposure from traffic does not exceed 65 dB Ldn at these activity areas. This shall be done thru site orientation (i.e., location of activity areas away from roadways or shielded by project buildings) or with the inclusion of appropriate noise barriers. Prior to PUD approval, the project applicant shall be required to submit an acoustical analysis demonstrating that outdoor activity spaces associated with sensitive uses do not exceed 65 dB Ldn within these spaces. Site(s) affected: All (Draft SEIR, pp. 4.J-21 to 4.J-26.) Impact 4.J-6